EP2212539B1 - Valve unit for an exhaust gas recirculation unit - Google Patents
Valve unit for an exhaust gas recirculation unit Download PDFInfo
- Publication number
- EP2212539B1 EP2212539B1 EP08871472A EP08871472A EP2212539B1 EP 2212539 B1 EP2212539 B1 EP 2212539B1 EP 08871472 A EP08871472 A EP 08871472A EP 08871472 A EP08871472 A EP 08871472A EP 2212539 B1 EP2212539 B1 EP 2212539B1
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- EP
- European Patent Office
- Prior art keywords
- actuator
- valve
- control element
- valve device
- inlet
- Prior art date
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 20
- 230000001276 controlling effect Effects 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 75
- 230000033001 locomotion Effects 0.000 claims description 51
- 230000000694 effects Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 64
- 238000001816 cooling Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/65—Constructional details of EGR valves
- F02M26/66—Lift valves, e.g. poppet valves
- F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
- F02M26/23—Layout, e.g. schematics
- F02M26/25—Layout, e.g. schematics with coolers having bypasses
- F02M26/26—Layout, e.g. schematics with coolers having bypasses characterised by details of the bypass valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
- F02M26/54—Rotary actuators, e.g. step motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
Definitions
- the invention relates to a valve device for an exhaust gas recirculation device of an internal combustion engine comprising at least one inlet and at least one outlet with an inlet, an engine inlet side outlet, and a plurality of, at least partially, parallel flow paths extending between inlet and outlet.
- EGR Exhaust gas recirculation
- a partial exhaust stream is controlled via a flow channel by means of an exhaust gas recirculation valve / regulated the internal combustion engine intake side mixed again.
- the addition to the fresh gas can be done before or in the combustion chamber.
- the resulting mixture of fresh and exhaust gas has a lower calorific value relative to the volume and therefore no longer reaches the temperature required for NOx formation in the combustion chamber of the internal combustion engine.
- the exhaust gas recirculation usually takes place in the partial load range.
- An improved NOx reduction can be achieved if the exhaust gas is cooled before being added to the fresh gas. This cooling is found especially in more powerful engines, with an exhaust gas recirculation cooler is used. Further advantages arise when not only the total recirculated exhaust gas flow, but also its cooling is regulated / controlled.
- an exhaust gas recirculation arrangement that includes an engine exhaust side inlet, an engine inlet side outlet, and two parallel flow paths extending between inlet and outlet.
- One flow path includes an exhaust gas recirculation cooler, while the other flow path forms a bypass for bypassing the exhaust gas recirculation cooler.
- an exhaust gas recirculation valve is provided, a regulation / control of the division of the recirculated exhaust gas flow between the two flow paths and thus the cooling by means of a cooling valve.
- a disadvantage is that in addition to the two valve actuators and the corresponding peripherals comprising in particular actuators, additional outputs to an engine control unit, harness taps, are required.
- an exhaust gas recirculation device for an internal combustion engine comprising: an intake air passage; an intake air control valve associated with the intake air passage; and an exhaust gas recirculation valve for returning a controlled amount of engine exhaust into the intake air passage, an actuator; a first motion transmission mechanism that is closed between the actuator and the exhaust gas recirculation valve; a second motion transmission mechanism connected between the actuator and the intake air control valve; and a moving direction reversing mechanism included in the first and second motion transmitting mechanisms, respectively, for reversing the direction of movement of the exhaust gas recirculation valve and the intake air control valve, respectively.
- the EP 1 378 655 A2 discloses a gas valve metering valve in a vehicle, comprising: a valve housing, the valve housing configured to conduct exhaust gas from an inlet port to an outlet port; a valve assembly positioned within the valve housing for selectively venting gas from the inlet channel to the outlet channel, the valve assembly having a first valve seat acting as an opening between the inlet channel and the outlet channel, and a first valve member connected to the first valve seat cooperates and functions as a movable barrier between the input channel and the output channel; a valve stem connected to the first valve member and actuated to move the first valve member It may be actuated in response to rotation of the valve stem and an actuator operable to rotate the valve stem to effect corresponding axial movement of the first valve member.
- the US 2003/0000497 A1 relates to an intake manifold assembly for an internal combustion engine, comprising: a) an intake manifold having an air inlet, and b) an intake valve assembly having a valve body formed in the intake manifold to regulate the flow of air into the manifold.
- the US 2005/0241702 A1 shows and describes a valve device comprising: a valve housing having a first flow passage and a second flow passage, a first damper shaft rotatable relative to the valve housing, a first damper disposed in the first flow passage and secured to the first damper shaft, a second damper shaft which is rotatable relative to the valve housing, a second damper disposed in the second flow passage and fixed to the second damper shaft, and a control arrangement for controlling the rotational position of the damper shafts and thereby the rotational position of the dampers, the control arrangement an actuator and a control member rotatable relative to the valve housing and arranged to be rotated by the actuator, the control assembly further comprising: a first motion transmission member that rotates relative to the control member and relative to the first damper shaft and a second motion transmitting member that is rotatable relative to the control member and relative to the second damper shaft and is arranged such that there is a rotational movement of the control element transmits in a rotational movement of
- the object of the invention is therefore to provide a valve device mentioned above, in which in particular a further actuator, additional outputs can be omitted on an engine control unit, harness taps that claimed only a small space and characterized by good tightness of the actuators in the closed state and high throughputs characterized by maximum open actuators.
- valve device having the features of claim 1, wherein according to the invention in the actuator starting position, the first actuator and the second actuator are closed, upon actuation starting from the actuator starting position in the direction of the first actuator end position only the first actuator and upon actuation in the direction of the second actuator end position, the first actuator and the second actuator are actuated sequentially and / or simultaneously.
- the first actuator and / or the second actuator are spring-loaded in the closing direction, so that with the actuator a .Betuschist in the opening direction and in the closing direction first and / or the second actuator follows the actuator spring force.
- first and / or the second actuator follows the actuator spring force.
- the first actuator and / or the second actuator are forcibly guided in the opening and in the closing direction.
- the closing force does not depend on the force of a spring, is also applied by the actuator, the corresponding actuator follows the actuator not only force but positive fit.
- the invention is between the actuator and the first actuator, a first transmission device and between the actuator and the second.
- Actuator provided a second transmission device.
- the transmission devices are used to convert the actuator movement in a movement of the actuators and allow each of the requirements specially adapted translation profiles.
- the first transmission device and / or the second transmission device is adapted to convert a rotary into a linear movement.
- first transmission device and / or the second transmission device comprises at least one link and at least one interacting with it.
- "Backing” in this context is understood to mean a driver-engaging element, even if no or at least no substantial relative movement takes place between the driver and this element.
- first transmission device and / or the second transmission device has a toothing with drive and driven toothing.
- the second actuator is bistable in the direction of an open or a closed position spring force.
- the second actuator is thus subjected to a force in the direction of the open or closed position, wherein, for example, an actuation against the (decreasing effective) spring force takes place when actuated, then a neutral dead center is reached in which the spring force is not effective in opening - Is or closing direction, and then spring force due to a "snap over" takes place in the direction of the closed position.
- the bistable actuator acts accordingly.
- the second actuator is by means of the actuator and the second transmission device Tot Vietnamese Republiceller obtainedd between the open or a closed position displaced.
- the second transmission device comprises play-related transmission elements with actuation direction-dependent changing adhesion, so that a hysteresis is achieved.
- an actuation of the second actuator results independently of an actuator movement. It results in an opening movement, another movement relationship between the actuator and actuator, as in a closing movement.
- FIG. 1 shows a motor vehicle internal combustion engine 152 with fresh gas inlet, exhaust outlet and exhaust gas recirculation device 140 with exhaust gas recirculation cooler 150 and bypass 142.
- the internal combustion engine 152 is presently exemplified a six-cylinder in-line internal combustion engine.
- a fresh gas inlet line 154 opens into a fresh gas collector 158, starting from which the cylinders of the internal combustion engine are supplied with fresh gas.
- the engine exhaust gases are supplied to an exhaust manifold 156 via an intake manifold 160.
- An exhaust gas turbocharger 162 is used to increase performance and includes an exhaust-driven turbine 164 and a power-connected with this fresh gas pump 166 for charged filling the cylinder of the engine with fresh gas.
- a charge air cooler 168 is provided.
- Exhaust gas recirculation device 140 includes an engine exhaust side inlet 146, an engine inlet side outlet 148, and two parallel flow paths 142, 144 extending between inlet 146 and outlet 148.
- an exhaust gas recirculation cooler 150 for recirculated cooling recirculated exhaust gas is arranged in the flow path 144.
- the parallel flow path 142 bypasses the flow path 144 and bypasses the exhaust gas recirculation cooler 150.
- the valve device 100 is preferably arranged in the branching region of the flow paths 142, 144. In the present case, the valve device 100 is arranged in the inlet-side branching region, but it may also be expedient to arrange the valve device 100 in the outlet-side branching region.
- FIG. 2a 10 shows a valve device 200 having an actuator 202, a lift valve 212, and a flapper valve 224 at an actuator position where the lift valve 212 is closed and the flapper valve 224 is open.
- An actuator position where the lift valve 212 is opened and the flapper valve 224 is open is in FIG FIG. 2b and an actuator position where the lift valve 212 is opened and the flapper valve 224 is closed is in FIG Figure 2c shown.
- the lift valve 212 serves as an exhaust gas recirculation valve and allows control of the entire exhaust gas flow flowing between the inlet 214 and the outlet.
- the flap valve 224 serves as a cooling valve and allows control of the distribution of the recirculated exhaust gas flow between the cooling path and the bypass 226 (FIG. Fig. 1 : 142, 144) and thus the cooling.
- the actuator 202 is an electric rotary drive, but if necessary, a hydraulic or pneumatic drive can also be used.
- the actuator 202 is rotatably connected to a fork-like transmission element 204.
- the transmission element 204 has longitudinal guides 206 extending in the direction of stroke valve axis.
- right angle pin 208 are guided to Hubventilachscardi, the ends of which are guided in the valve housing side spiral-shaped scenes 207, 209.
- the pins 208 are provided with a rotatable shaft 210 the lift valve 212 firmly connected.
- a spring 216 By means of a spring 216, the lifting valve 212 is subjected to a force in the closing direction.
- the transmission element 204 is rotated accordingly and takes by means of the longitudinal guides 206, the pin 208 with.
- the pins 208 are moved along the scenes 207, 209 and the lifting valve 212 opens against the force of the spring 216 by lifting it from the valve housing side valve seat 213.
- the course of movement of the lift valve 212 as a function of the rotational movement of the actuator 202 is shown in the diagram 700 in FIG. 7 shown.
- the actuator angle from -80 ° to + 80 ° is plotted on the X-axis.
- At 0 ° there is an actuator starting position between an actuator end position with a positive actuator angle and an actuator end position with a negative actuator angle.
- a dashed line 702 shows the course of movement of the lift valve 212 depending on the rotational movement of the actuator 202.
- the lift valve 212 In the actuator output position at an actuator angle of 0 °, the lift valve 212 is closed.
- the opening function is based on the actuator output position in the direction of positive and negative actuator angle symmetrical and has an overall approximately parabolic shape.
- the actuator 202 is also rotatably connected to a further transmission element 218, which has a toothing, in this case a toothed segment 219. With this toothing corresponds to a gear element 220, which in turn cooperates with a connected to a shaft of the flap valve 224 transmission element 222.
- the flap valve 224 is urged by a spring 228 in the closing direction.
- a Spring 230 serves for the corresponding loading of the gear element 220.
- a line 704 shows the course of movement of the flap valve 224 depending on the rotational movement of the actuator 202.
- the flapper valve 224 In the actuator starting position at an actuator angle of 0 °, the flapper valve 224 is closed. Upon actuation of the actuator in the direction of negative actuator angle opens the flapper valve 224.
- the opening function initially corresponds to an at least approximately steadily increasing straight line, wherein at an actuator angle of about 20 °, a maximum opening of the flap valve 224 is reached.
- the flap valve 224 Upon further actuation of the actuator 202, the flap valve 224 does not open further, the further rotation of the gear member 220 takes place against the spring 230 without the transfer element 222 is taken. Upon actuation of the actuator in the direction of positive actuator angle, the flapper valve 224 remains closed. In this operating direction, no entrainment of the transmission element 222 takes place.
- both the lifting valve 212 and the flap valve 224 are opened in the direction of a negative actuator angle so that the recirculated exhaust gas flow is guided past the bypass 226 via the bypass recirculation cooler.
- the lift valve 212 is opened, so that the recirculated exhaust gas flow through the flow path with exhaust gas recirculation cooler ( Fig. 1 : 144, 150).
- FIG. 3 1 shows a valve device 300 with an actuator 302 and two poppet valves 312, 324.
- the poppet valve 312 is the flow path with exhaust gas recirculation cooler (FIG. Fig. 1 : 144, 150) and the poppet valve 324 is the bypass ( Fig. 1 : 142).
- Each poppet valve 312, 324 allows control of the respective flow path (FIG. Fig. 1 : 142, 144) flowing exhaust gas flow.
- the actuator 302 is an electric rotary drive, but if necessary, a hydraulic or pneumatic drive can also be used.
- the actuator 302 is rotatably connected to a fork-like transmission element 304.
- the two ends 303, 305 of the transmission element 304 serve as a "link" for entrainment of drivers 308 or 320.
- the driver 308 is associated with the poppet valve 312, the driver 320 is associated with the poppet valve 324. Both poppet valves 312, 324 are force-urged in the closing direction by means of a spring 316, wherein the spring 316 on the driver 308 on the one hand and on the driver 320 on the other hand is supported and acts on both drivers
- the course of movement of the poppet valves 312, 324 as a function of the rotational movement of the actuator 302 is shown in the diagram 800 in FIG. 8 shown.
- the actuator angle from -80 ° to + 80 ° is plotted on the X-axis. At 0 °, there is an actuator starting position between an actuator end position with a positive actuator angle and an actuator end position with a negative actuator angle.
- a dashed line 802 shows the course of movement of the poppet valve 312 depending on the rotational movement of the actuator 302.
- the poppet valve 312 In the actuator home position at an actuator angle of 0 °, the poppet valve 312 is closed.
- the poppet valve 324 Upon actuation of the actuator in the direction of positive actuator angle opens the poppet valve 312, while the poppet valve 324 remains closed by the two ends 303, 305 of the transmission element 304 take the driver 308.
- the poppet valve 312 is opened in the direction of a positive actuator angle, while the poppet valve 324 remains closed, so that only the flow path with exhaust gas recirculation cooler (FIG. Fig. 1 : 144, 150) is opened.
- a line 804 shows the course of movement of the poppet valve 324 depending on the rotational movement of the actuator 302.
- the poppet valve 324 In the actuator starting position at an actuator angle of 0 °, the poppet valve 324 is closed. Upon actuation of the actuator in the direction of negative actuator angle opens the poppet valve 324, while the poppet valve 312 remains closed by the two ends 303, 305 of the transmission element 304 take the driver 320. Starting from the actuator starting position at 0 °, the poppet valve 324 is opened in the direction of a negative actuator angle, while the poppet valve 312 remains closed, so that only the bypass ( Fig. 1 : 142) is opened.
- the branch of the opening curve 802 in the direction of positive actuator angle and the branch of the opening curve 804 in the direction of negative actuator angle together have an approximately parabolic shape with respect to the actuator starting position.
- FIG. 4a 1 shows a valve device 400 with an actuator 402 and two turntable valves 412, 424.
- An actuator position in which the turntable valve 412 is closed and the turntable valve 424 is opened is shown in FIG FIG. 4b and an actuator position where the turntable valve 412 is opened and the turntable valve 424 is closed is in FIG Figure 4c shown.
- the turntable valve 412 is connected to the flow path 414 with an exhaust gas recirculation cooler (FIG. Fig. 1 : 144, 150) and the turntable valve 424 is the bypass 426 ( Fig. 1 : 142).
- Each turntable valve 412, 424 allows control of the respective flow path (FIG. Fig. 1 : 142, 144) flowing exhaust gas flow.
- the actuator 402 is an electric rotary drive, but if necessary, a hydraulic or pneumatic drive can also be used.
- the actuator 402 is rotatably connected to a fork-like transmission element 404.
- the two ends 403, 405 of the transmission element 404 serve as a "backdrop" for entrainment of drivers 408 or 420.
- the driver 408 is associated with the turntable valve 412, the driver 420 is assigned to the turntable valve 424. Both turntable valves 412, 424 are subjected to a force in the closing direction by means of a spring 416, wherein the spring 416 on the driver 408 on the one hand and on the driver 420 on the other hand, and thus acts on both drivers.
- the course of movement of the turntable valves 412, 424 as a function of the rotational movement of the actuator 402 is shown in the diagram 800 in FIG. 8 and corresponds to that of the valve device 300, wherein the curve 802 shows the opening curve of the turntable valve 412 and de curve 804 shows the opening curve of the turntable valve 424.
- FIG. 5 1 shows a valve device 500 with an actuator 502 and two lift valves 512, 524.
- the lift valve 512 is connected to the flow path with an exhaust gas recirculation cooler (FIG. Fig. 1 : 144, 150) and the lift valve 524 is the bypass ( Fig. 1 : 142).
- Each lift valve 512, 524 allows control of the respective flow path (FIG. Fig. 1 : 142, 144) flowing exhaust gas flow.
- the actuator 502 is an electric rotary drive, but if necessary, a hydraulic or pneumatic drive can also be used.
- the actuator 502 is rotatably connected to a fork-like transmission element 504.
- the two ends 503, 505 of the transmission element 504 serve as a "backdrop" for driving to Hubventilachscardi right-angled peg-shaped drivers 508 or 520, the ends of which are guided in the valve housing side spiral-shaped scenes (not shown).
- the drivers 508, 520 are fixedly connected to the rotatable shafts 511, 523 of the lift valves 512, 524.
- a spring 516 By means of a spring 516, the lift valves 512, 524 are subjected to a force in the closing direction.
- the transmission element 504 Upon rotation of the actuator 502, the transmission element 504 is rotated accordingly and takes depending on the direction of rotation by means of the ends 503, 505 either the driver 508 or the driver 520 with.
- the driver 508 or 520 along the valve housing side scenes are moved and the respective lift valve 512 or 524 opens against the force of the spring 516 by lifting it from a valve seat side valve seat.
- the course of movement of the lift valves 512, 524 as a function of the rotational movement of the actuator 502 is shown in the diagram 800 in FIG. 8 and corresponds to that of the valve devices 300 and 400, wherein the curve 802 shows the opening profile of the lift valve 512 and the curve 804 shows the opening curve of the lift valve 524.
- FIG. 6a shows a valve device 600 with an actuator 602, a lift valve 612 a bistable flap valve 624.
- the flapper valve 624 in the closed position is in FIG. 6b
- the flapper valve 624 when actuated in the direction of opening position before dead center is in FIG. 6c
- the flap valve 624 in the open position after dead center is in FIG. 6d shown.
- the lift valve 612 serves as an exhaust gas recirculation valve and allows control of the entire between inlet and outlet (FIG. Fig. 1 : 146, 148) flowing exhaust gas flow.
- the flap valve 624 serves as a cooling valve and enables a regulation / control of the distribution of the recirculated exhaust gas flow between the cooling path and the bypass 626 (FIG. Fig. 1 : 142, 144) and thus the cooling.
- the actuator 602 is an electric rotary drive, but if necessary, a hydraulic or pneumatic drive can also be used.
- the actuator 602 is rotatably connected to a transmission element 604, which has an arcuate, in particular arcuate, backdrop 606.
- the link 606 is spaced from the actuator axis, has in its center a minimum distance to the actuator axis and in the direction of their ends an increasing distance to the actuator axis.
- a driver 608 is guided, which is connected to the shaft 610 of the lift valve 612.
- the driver 608 is in the present case a roller which is rotatably mounted on the shaft 610 of the lift valve 612. This role is performed in the gate 606 comprises two sides and rolls on actuation of the actuator on the backdrop side surface of the transmission element 604 from.
- the actuator axis is at least approximately at right angles to the axis of the lift valve 612.
- the course of movement of the lift valve 612 as a function of the rotational movement of the actuator 602 is shown in the diagram 900 in FIG. 9 shown.
- the actuator angle from -80 ° to + 80 ° is plotted on the X-axis.
- At 0 ° lies between an actuator end position with positive actuator angle and a Actuator end position with negative actuator angle an actuator home position.
- a dashed line 902 shows the course of movement of the lift valve 612 depending on the rotational movement of the actuator 602.
- the lift valve 612 In the actuator starting position at an actuator angle of 0 °, the lift valve 612 is closed.
- the opening function is based on the actuator-starting position in the direction of positive and negative actuator angle symmetrical and has an overall approximately parabolic shape.
- the transmission element 622 has two mutually angled arms, which include a recess in which the driver 620 is received.
- the driver 618 is accommodated play in the recess transmission element 622.
- a third arm of the transmission element 622 serves to receive a spring 628, which on the other hand is supported on the valve housing.
- the transmission element 622 is pivotable between two end positions which correspond to an open and a closed position of the flap valve 624.
- the axis of the shaft 630 is maximally remote from the axis of the spring 628, whereby the spring 628 exerts a maximum tensile component on the transmission element 622 in the direction of rotation of the respective end position.
- the axis of the shaft 630 coincides with the axis of the spring 628, no spring force component acts on the transmission element 622 in the direction of rotation towards the end position. This position is called "dead center".
- a line 904 shows the course of movement of the flap valve 624 depending on the rotational movement of the actuator 602.
- the flapper valve 624 In the actuator starting position at an actuator angle of 0 °, the flapper valve 624 is closed. Upon actuation of the actuator in the direction of negative actuator angle opens the flapper valve 624.
- the opening function corresponds in a range 906 initially a steep, rising parabolic branch. In this operating range up to an actuator angle of about 15 °, the transmission element 622 is pivoted in the flap valve opening direction by means of the driver 620.
- this section 907 corresponds to the opening function at least approximately a straight line, wherein at an actuator angle of 10-30 °, in particular at about 18 °, a maximum opening of the flap valve 624 is reached. Further actuation of the actuator in the opening direction no longer affects the flapper valve 624, it remains maximally open.
- the flapper valve 624 is closed.
- the closing function corresponds to a steeply falling parabolic branch in a region 908.
- the transmission element 622 is pivoted in the flap valve closing direction by means of the driver 620.
- the dead center is exceeded, a further pivoting of the transmission element 622 occurs due to the force of the spring 628, wherein the transmission element 622 over the dead center "snaps" and the contact between the transmission element 622 and driver 620 is temporarily released.
- the closing function corresponds at least approximately to a straight line.
- both the lift valve 612 and the flapper valve 624 are opened in the direction of negative actuator angle, so that the recirculated exhaust gas flow through the Bypass 626 is guided past the exhaust gas recirculation cooler.
- the lift valve 612 is opened, so that the recirculated exhaust gas flow through the flow path with exhaust gas recirculation cooler ( Fig. 1 : 144, 150).
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- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
Die Erfindung betrifft eine Ventileinrichtung für eine Abgasrückführungseinrichtung einer wenigstens einen Einlass und wenigstens einen Auslass umfassenden Brennkraftmaschine mit einem brennkraftmaschinenauslassseitigen Einlass, einem brennkraftmaschineneinlassseitigen Auslass und mehreren, insbesondere zwei, sich zwischen Einlass und Auslass erstreckenden, zumindest bereichsweise parallelen Strömungswegen, wobei die Ventileinrichtung zur Regelung/Steuerung des zwischen Einlass und Auslass strömenden Fluidstroms und zur Regelung/Steuerung der Aufteilung dieses Fluidstroms zwischen den mehren Strömungswegen ein erstes Stellglied und ein zweites Stellglied sowie einen gemeinsamen Aktuator zur Betätigung sowohl des ersten Stellglieds als auch des zweiten Stellglieds aufweist und wobei eine erste Aktuator-Endposition, eine zweite Aktuator-Endposition und eine zwischen erster und zweiter Aktuator-Endposition liegende Aktuator-Ausgangsposition vorgesehen sind, wobei eine Betätigung in Richtung der ersten Aktuator-Endposition und in Richtung der zweiten Aktuator-Endposition ermöglicht ist. Die Abgasrückführung (AGR) ist eine Maßnahme zur Verringerung von Stickstoffoxiden (NOx) insbesondere bei Brennkraftmaschinen von Kraftfahrzeugen und ist vor allem bei mager betriebenen Brennkraftmaschinen von Bedeutung. Ein Abgasteilstrom wird dabei über einen Strömungskanal mittels eines Abgasrückführungsventils gesteuert/geregelt der Brennkraftmaschine ansaugseitig wieder zugemischt. Die Zumischung zum Frischgas kann vor dem oder in den Brennraum erfolgen. Das entstehende Gemisch aus Frisch- und Abgas besitzt einen bezogen auf das Volumen niedrigeren Brennwert und erreicht daher nicht mehr die für die NOx-Bildung erforderliche Temperatur im Brennraum der Brennkraftmaschine. Die Abgasrückführung findet üblicherweise im Teillastbereich statt.The invention relates to a valve device for an exhaust gas recirculation device of an internal combustion engine comprising at least one inlet and at least one outlet with an inlet, an engine inlet side outlet, and a plurality of, at least partially, parallel flow paths extending between inlet and outlet. Controlling the flow of fluid between the inlet and outlet and for controlling the distribution of this fluid flow between the plurality of flow paths, a first actuator and a second actuator and a common actuator for actuating both the first actuator and the second actuator and wherein a first Aktuator- End position, a second actuator end position and a lying between the first and second actuator end position actuator starting position are provided, wherein an actuation i n direction of the first actuator end position and in the direction of the second actuator end position is made possible. Exhaust gas recirculation (EGR) is a measure for the reduction of nitrogen oxides (NOx) especially in internal combustion engines of motor vehicles and is especially important in lean-burn internal combustion engines of importance. A partial exhaust stream is controlled via a flow channel by means of an exhaust gas recirculation valve / regulated the internal combustion engine intake side mixed again. The addition to the fresh gas can be done before or in the combustion chamber. The resulting mixture of fresh and exhaust gas has a lower calorific value relative to the volume and therefore no longer reaches the temperature required for NOx formation in the combustion chamber of the internal combustion engine. The exhaust gas recirculation usually takes place in the partial load range.
Eine verbesserte NOx-Reduktion kann erreicht werden, wenn das Abgas vor der Zumischung zum Frischgas gekühlt wird. Diese Kühlung findet sich insbesondere bei leistungsstärkeren Motoren, wobei ein Abgasrückführungskühler verwendet wird. Weitere Vorteile ergeben sich, wenn nicht nur der rückgeführte Abgasstrom insgesamt, sondern auch dessen Kühlung regel-/steuerbar ist.An improved NOx reduction can be achieved if the exhaust gas is cooled before being added to the fresh gas. This cooling is found especially in more powerful engines, with an exhaust gas recirculation cooler is used. Further advantages arise when not only the total recirculated exhaust gas flow, but also its cooling is regulated / controlled.
Aus der
Nachteilig ist dabei, dass neben den beiden Ventilstellgliedern auch die entsprechende Peripherie umfassend insbesondere Aktuatoren, zusätzliche Ausgänge an einem Brennkraftmaschinensteuergerät, Kabelbaumabgriffe, erforderlich sind.A disadvantage is that in addition to the two valve actuators and the corresponding peripherals comprising in particular actuators, additional outputs to an engine control unit, harness taps, are required.
Aus der
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Aufgabe der Erfindung ist es daher, eine eingangs genannte Ventileinrichtung bereitzustellen, bei der insbesondere ein weiterer Aktuator, zusätzliche Ausgänge an einem Brennkraftmaschinensteuergerät, Kabelbaumabgriffe entfallen können, das einen nur geringen Bauraum beansprucht und das sich durch gute Dichtheit der Stellglieder in geschlossenem Zustand und hohe Durchsätze bei maximal geöffneten Stellgliedern auszeichnet.The object of the invention is therefore to provide a valve device mentioned above, in which in particular a further actuator, additional outputs can be omitted on an engine control unit, harness taps that claimed only a small space and characterized by good tightness of the actuators in the closed state and high throughputs characterized by maximum open actuators.
Die Lösung der Aufgabe erfolgt mit einer Ventileinrichtung mit den Merkmalen des Anspruchs 1, wobei erfindungsgemäß in der Aktuator-Ausgangsposition das erste Stellglied und das zweite Stellglied geschlossen sind, bei einer Betätigung ausgehend von der Aktuator-Ausgangsposition in Richtung der ersten Aktuator-Endposition nur das erste Stellglied und bei einer Betätigung in Richtung der zweiten Aktuator-Endposition das erste Stellglied und das zweite Stellglied nacheinander und/oder gleichzeitig betätigt werden.The object is achieved with a valve device having the features of claim 1, wherein according to the invention in the actuator starting position, the first actuator and the second actuator are closed, upon actuation starting from the actuator starting position in the direction of the first actuator end position only the first actuator and upon actuation in the direction of the second actuator end position, the first actuator and the second actuator are actuated sequentially and / or simultaneously.
Besonders zu bevorzugende Ausführungen und Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.Particularly preferred embodiments and developments of the invention are the subject of the dependent claims.
Zweckmäßigerweise sind das erste Stellglied und/oder das zweite Stellglied in Schließrichtung federkraftbeaufschlagt, sodass mit dem Aktuator eine .Betätigung in Öffnungsrichtung erfolgt und in Schließrichtung erste und/oder das zweite Stellglied den Aktuator federkraftbeaufschlagt folgt. Mit dieser Anordnung ist auch eine Fail-Safe-Funktion gewährleistet. Ebenso wird es als zweckmäßig angesehen, wenn das erste Stellglied und/oder das zweite Stellglied in Öffnungs- und in Schließrichtung zwangsgeführt sind. In diesem Fall hängt die Schließkraft nicht von der Kraft einer Feder ab, wird ebenfalls vom Aktuator aufgebracht, das entsprechende Stellglied folgt dem Aktuator nicht nur kraft- sondern formschlüssig.Advantageously, the first actuator and / or the second actuator are spring-loaded in the closing direction, so that with the actuator a .Betätigung in the opening direction and in the closing direction first and / or the second actuator follows the actuator spring force. With this arrangement, a fail-safe function is ensured. Likewise, it is considered expedient if the first actuator and / or the second actuator are forcibly guided in the opening and in the closing direction. In this case, the closing force does not depend on the force of a spring, is also applied by the actuator, the corresponding actuator follows the actuator not only force but positive fit.
Gemäß einer besonders bevorzugten Ausführung der Erfindung ist zwischen Aktuator und erstem Stellglied eine erste Getriebeeinrichtung und zwischen Aktuator und zweiten. Stellglied eine zweite Getriebeeinrichtung vorgesehen. Die Getriebeeinrichtungen dienen zur Wandlung der Aktuatorbewegung in eine Bewegung der Stellglieder und ermöglichen jeweils den Erfordernissen besonders angepasste Übersetzungsprofile.According to a particularly preferred embodiment of the invention is between the actuator and the first actuator, a first transmission device and between the actuator and the second. Actuator provided a second transmission device. The transmission devices are used to convert the actuator movement in a movement of the actuators and allow each of the requirements specially adapted translation profiles.
Bei einer Ventileinrichtung, bei der der Aktuator ein Rotationsantrieb ist, ist vorzugsweise die erste Getriebeeinrichtung und/oder die zweite Getriebeeinrichtung geeignet, eine rotatorische in eine lineare Bewegung zu wandeln.In a valve device in which the actuator is a rotary drive, preferably the first transmission device and / or the second transmission device is adapted to convert a rotary into a linear movement.
Sehr vorteilhaft ist es, wenn die erste Getriebeeinrichtung und/oder die zweite Getriebeeinrichtung wenigstens eine Kulisse und wenigstens einen mit dieser zusammenwirkenden umfasst. Unter "Kulisse" wird in diesem Zusammenhang auch ein einen Mitnehmer mitnehmendes Element verstanden, auch wenn keine oder zumindest keine wesentliche Relativbewegung zwischen Mitnehmer und diesem Element statt findet.It is very advantageous if the first transmission device and / or the second transmission device comprises at least one link and at least one interacting with it. "Backing" in this context is understood to mean a driver-engaging element, even if no or at least no substantial relative movement takes place between the driver and this element.
Als besonders zweckmäßig hat es sich erwiesen, wenn mit der zweiten Getriebeeinrichtung eine diskontinuierliche Bewegungsübertragung zwischen Aktuator und zweitem Stellglied erreicht ist, sodass das zweite Stellglied nicht immer betätigt wird, wenn der Aktuator betätigt wird.It has proven particularly expedient if a discontinuous transmission of motion between the actuator and the second actuator is achieved with the second transmission device, so that the second actuator is not always actuated when the actuator is actuated.
Vorteilhaft ist es ferner, wenn die erste Getriebeeinrichtung und/oder die zweite Getriebeeinrichtung eine Verzahnung mit Antriebs- und Abtriebsverzahnung aufweist.It is also advantageous if the first transmission device and / or the second transmission device has a toothing with drive and driven toothing.
Gemäß einer besonders bevorzugten Ausführung der Erfindung Ventileinrichtung ist das zweite Stellglied bistabil in Richtung einer Öffnungs- oder einer Schließstellung federkraftbeaufschlagt. Das zweite Stellglied wird so in Richtung der Öffnungs- oder Schließstellung kraftbeaufschlagt, wobei beispielsweise bei einer Betätigung ausgehend von der Öffnungsstellung zunächst eine Betätigung gegen die (abnehmend wirksame) Federkraft erfolgt, dann ein neutraler Totpunkt erreicht wird, in dem die Federkraft nicht wirksam in Öffnungs- oder Schließrichtung ist, und dann federkraftbedingt ein "überschnappen" in Richtung der Schließstellung erfolgt. In umgekehrter Richtung wirkt das bistabile Stellglied entsprechend.According to a particularly preferred embodiment of the invention valve device, the second actuator is bistable in the direction of an open or a closed position spring force. The second actuator is thus subjected to a force in the direction of the open or closed position, wherein, for example, an actuation against the (decreasing effective) spring force takes place when actuated, then a neutral dead center is reached in which the spring force is not effective in opening - Is or closing direction, and then spring force due to a "snap over" takes place in the direction of the closed position. In the opposite direction, the bistable actuator acts accordingly.
Zweckmäßigerweise ist das zweite Stellglied mittels des Aktuators und der zweiten Getriebeeinrichtung totpunktübergehend zwischen der Öffnungs- oder einer Schließstellung verlagerbar.Conveniently, the second actuator is by means of the actuator and the second transmission device Totpunktübergehend between the open or a closed position displaced.
Vorzugsweise umfasst die zweite Getriebeeinrichtung spielbehaftete Übertragungselemente mit betätigungsrichtungsabhängig wechselndem Kraftschluss, sodass eine Hysterese erzielt ist. Beim Überschreiten des Totpunkts ergibt sich so unter Durchlaufen des Spiels federkraftbedingt eine Betätigung des zweiten Stellglieds unabhängig von einer Aktuatorbewegung. Es ergibt sich bei einer Öffnungsbewegung ein anderer Bewegungszusammenhang zwischen Aktuator und Stellelement, als bei einer Schließbewegung.Preferably, the second transmission device comprises play-related transmission elements with actuation direction-dependent changing adhesion, so that a hysteresis is achieved. When the dead center is exceeded, as a result of the play, as a result of the play, an actuation of the second actuator results independently of an actuator movement. It results in an opening movement, another movement relationship between the actuator and actuator, as in a closing movement.
Nachfolgend sind unter Bezugnahme auf Figuren besonders zu bevorzugende Ausführungen und Weiterbildungen der Erfindung näher erläutert, dabei zeigen schematisch und beispielhaft
- Figur 1
- eine Kraftfahrzeugbrennkraftmaschine mit Frischgaseinlass, Abgasauslass und Abgasrückführungseinrichtung mit Abgasrückführungskühler und Bypass,
- Figur 2a
- eine Ventileinrichtung mit einem Aktuator, einem Hubventil und einem Klappenventil, Hubventil geschlossen und Klappenventil geöffnet,
- Figur 2b
- eine Ventileinrichtung mit einem Aktuator, einem Hubventil und einem Klappenventil, Hubventil geöffnet und Klappenventil geöffnet,
- Figur 2c
- eine Ventileinrichtung mit einem Aktuator, einem Hubventil und einem Klappenventil, Hubventil geöffnet und Klappenventil geschlossen,
- Figur 3
- eine Ventileinrichtung mit einem Aktuator und zwei Tellerventilen,
- Figur 4a
- eine Ventileinrichtung mit einem Aktuator und zwei Drehtellerventilen,
- Figur 4b
- eine Ventileinrichtung mit einem Aktuator und zwei Drehtellerventilen, erstes Drehtellerventil geschlossen, zweites Drehtellerventil geöffnet,
- Figur 4c
- eine Ventileinrichtung mit einem Aktuator und zwei Drehtellerventilen, erstes Drehtellerventil geöffnet, zweites Drehtellerventil geschlossen,
- Figur 5
- eine Ventileinrichtung mit einem Aktuator und zwei Hubventiten,
- Figur 6a
- eine Ventileinrichtung mit einem Aktuator, einem Hubventil und einem bistabilen Klappenventil,
- Figur 6b
- eine Ventileinrichtung mit einem Aktuator, einem Hubventil und einem bistabilen Klappenventil, Klappenventil in Schließstellung,
- Figur 6c
- eine Ventileinrichtung mit einem Aktuator, einem Hubventil und einem bistabilen Klappenventil, Klappenventil bei Betätigung in Richtung Öffnungsstellung vor Totpunkt,
- Figur 6d
- eine Ventileinrichtung mit einem Aktuator, einem Hubventil und einem bistabilen Klappenventil, Klappenventil in Öffnungsstellung nach Totpunkt,
- Figur 7
- ein Diagramm zur Stellung der Stellglieder in Bezug auf die Aktuatorstellung bei einer Ventileinrichtung gemäß
Figur 2a-2c , - Figur 8
- ein Diagramm zur Stellung der Stellglieder in Bezug auf die Aktuatorstellung bei Ventileinrichtungen gemäß
Figur 3-5 und - Figur 9
- ein Diagramm zur Stellung der Stellglieder in Bezug auf die Aktuatorstellung bei einer Ventileinrichtung gemäß
Figur 6a-6d .
- FIG. 1
- a motor vehicle internal combustion engine with fresh gas inlet, exhaust gas outlet and exhaust gas recirculation device with exhaust gas recirculation cooler and bypass,
- FIG. 2a
- a valve device with an actuator, a lift valve and a flap valve, lift valve closed and flap valve opened,
- FIG. 2b
- a valve device with an actuator, a lift valve and a flap valve, lift valve open and flap valve opened,
- Figure 2c
- a valve device with an actuator, a lift valve and a flap valve, lift valve open and flapper valve closed,
- FIG. 3
- a valve device with an actuator and two poppet valves,
- FIG. 4a
- a valve device with an actuator and two turntable valves,
- FIG. 4b
- a valve device with an actuator and two turntable valves, first turntable valve closed, second turntable valve open,
- Figure 4c
- a valve device with an actuator and two turntable valves, first turntable valve open, second turntable valve closed,
- FIG. 5
- a valve device with an actuator and two Hubventiten,
- FIG. 6a
- a valve device with an actuator, a lift valve and a bistable flapper valve,
- FIG. 6b
- a valve device with an actuator, a lifting valve and a bistable flap valve, flap valve in the closed position,
- FIG. 6c
- a valve device with an actuator, a lifting valve and a bistable flap valve, flap valve when actuated in the direction of opening position before dead center,
- FIG. 6d
- a valve device with an actuator, a lifting valve and a bistable flap valve, flap valve in open position after dead center,
- FIG. 7
- a diagram for the position of the actuators with respect to the actuator position in a valve device according to
Figure 2a-2c . - FIG. 8
- a diagram for the position of the actuators with respect to the actuator position in valve devices according to
Figure 3-5 and - FIG. 9
- a diagram for the position of the actuators with respect to the actuator position in a valve device according to
Figure 6a-6d ,
Abgasrückführungseinrichtung 140 weist einen brennkraftmaschinenauslassseitigen Einlass 146, einem brennkraftmaschineneinlassseitigen Auslass 148 und zwei, sich zwischen Einlass 146 und Auslass 148 erstreckende parallele Strömungswegen 142, 144 auf. In dem Strömungsweg 144 ist ein Abgasrückführungskühler 150 zur leistungssteigernden Kühlung rückgeführte Abgases angeordnet. Der zu diesem parallele Strömungsweg 142 bildet einen Bypass zum Strömungsweg 144 und dient zur Umgehung des Abgasrückführungskühlers 150. Mittels einer Ventileinrichtung 100 ist sowohl der zwischen Einlass 146 und Auslass 148 strömende gesamte rückgeführte Abgasstrom als auch dessen Aufteilung zwischen den beiden Strömungswegen 142, 144 und damit dessen Kühlung regel-/steuerbar. Die Ventileinrichtung 100 ist vorzugsweise im Verzweigungsbereich der Strömungswege 142, 144 angeordnet. Vorliegend ist die Ventileinrichtung 100 im einlassseitigen Verzweigungsbereich angeordnet, ebenso kann es jedoch zweckmäßig sein, die Ventileinrichtung 100 im auslassseitigen Verzweigungsbereich anzuordnen.Exhaust gas recirculation device 140 includes an engine exhaust side inlet 146, an engine inlet side outlet 148, and two parallel flow paths 142, 144 extending between inlet 146 and outlet 148. In the flow path 144, an exhaust gas recirculation cooler 150 for recirculated cooling recirculated exhaust gas is arranged. The parallel flow path 142 bypasses the flow path 144 and bypasses the exhaust gas recirculation cooler 150. By means of a valve device 100, both the total recirculated exhaust gas flow flowing between inlet 146 and outlet 148 is divided therebetween Flow paths 142, 144 and thus its cooling rule / controllable. The valve device 100 is preferably arranged in the branching region of the flow paths 142, 144. In the present case, the valve device 100 is arranged in the inlet-side branching region, but it may also be expedient to arrange the valve device 100 in the outlet-side branching region.
Das Hubventil 212 dient als Abgasrückführungsventil und ermöglicht eine Regelung/Steuerung des gesamten zwischen Einlass 214 und Auslass strömenden Abgasstroms. Das Klappenventil 224 dient als Kühlungsventil und ermöglicht eine Regelung/Steuerung der Aufteilung des rückgeführten Abgasstroms zwischen Kühlpfad und Bypass 226 (
Der Aktuator 202 ist ein elektrischer Rotationsantrieb, gegebenenfalls kann jedoch auch ein hydraulischer oder pneumatischer Antrieb verwendet werden. Der Aktuator 202 ist mit einem gabelartigen Übertragungselement 204 drehfest verbunden. Das Übertragungselement 204 weist sich in Hubventilachsrichtung erstreckende Längsführungen 206 auf. In den Längsführungen 206 sind zur Hubventilachsrichtung rechtswinklige Zapfen 208 geführt, deren Enden in ventilgehäuseseitigen spiralförmigen Kulissen 207, 209 geführt sind. Die Zapfen 208 sind mit einem drehbaren Schaft 210 des Hubventils 212 fest verbunden. Mittels einer Feder 216 ist das Hubventil 212 in Schließrichtung kraftbeaufschlagt.The
Bei einer Drehung des Aktuators 202 in Hubventilöffnungsrichtung wird das Übertragungselement 204 entsprechend gedreht und nimmt mittels der Längsführungen 206 die Zapfen 208 mit. Dabei werden die Zapfen 208 entlang der Kulissen 207, 209 bewegt und das Hubventil 212 öffnet entgegen der Kraft der Feder 216, indem es vom ventilgehäuseseitigen Ventilsitz 213 abhebt.Upon rotation of the
Der Bewegungsverlauf des Hubventils 212 abhängig von der Drehbewegung des Aktuators 202 ist im Diagramm 700 in
Der Aktuator 202 ist außerdem mit einem weiteren Übertragungselement 218 drehfest verbunden, das eine Verzahnung, vorliegend ein Zahnsegment 219, aufweist. Mit dieser Verzahnung korrespondiert ein Zahnradelement 220, das seinerseits mit einem mit einer Welle des Klappenventils 224 verbundenen Übertragungselement 222 zusammenwirkt. Das Klappenventil 224 ist mittels einer Feder 228 in Schließrichtung kraftbeaufschlagt. Eine Feder 230 dient zur entsprechenden Beaufschlagung des Zahnradelements 220.The
Bei einer Drehung des Aktuators 202 in Richtung negativer Aktuatorwinkel (
Der Bewegungsverlauf des Klappenventils 224 abhängig von der Drehbewegung des Aktuators 202 ist ebenfalls im Diagramm in
Ausgehend von der Aktuator-Ausgangsposition bei 0° werden so in Richtung negativer Aktuatorwinkel sowohl das Hubventil 212 als auch das Klappenventil 224 geöffnet, sodass der rückgeführte Abgasstrom durch den Bypass 226 am Abgasrückführungskühler vorbei geführt wird. In Richtung positiver Aktuatorwinkel wird nur das Hubventil 212 geöffnet, sodass der rückgeführte Abgasstrom durch den Strömungsweg mit Abgasrückführungskühler (
Der Aktuator 302 ist ein elektrischer Rotationsantrieb, gegebenenfalls kann jedoch auch ein hydraulischer oder pneumatischer Antrieb verwendet werden. Der Aktuator 302 ist mit einem gabelartigen Übertragungselement 304 drehfest verbunden. Die beiden Enden 303, 305 des Übertragungselements 304 dienen als "Kulisse" zur Mitnahme von Mitnehmern 308 oder 320. Der Mitnehmer 308 ist dem Tellerventil 312 zugeordnet, der Mitnehmer 320 ist dem Tellerventil 324 zugeordnet. Beide Tellerventile 312, 324 sind in Schließrichtung mittels einer Feder 316 kraftbeaufschlagt, wobei sich die Feder 316 am Mitnehmer 308 einerseits und am Mitnehmer 320 andererseits anstützt und so auf beide Mitnehmer wirktThe
Der Bewegungsverlauf der Tellerventile 312, 324 abhängig von der Drehbewegung des Aktuators 302 ist im Diagramm 800 in
Eine gestrichelte Linie 802 zeigt den Bewegungsverlauf des Tellerventils 312 abhängig von der Drehbewegung des Aktuators 302. In der Aktuator-Ausgangsposition bei einem Aktuatorwinkel von 0° ist das Tellerventil 312 geschlossen. Bei Betätigung des Aktuators in Richtung positiver Aktuatorwinkel öffnet das Tellerventil 312, während das Tellerventil 324 geschlossen bleibt, indem die beiden Enden 303, 305 des Übertragungselements 304 den Mitnehmer 308 mitnehmen. Ausgehend von der Aktuator-Ausgangsposition bei 0° wird so in Richtung positiver Aktuatorwinkel das Tellerventil 312 geöffnet, während das Tellerventil 324 geschlossen bleibt, sodass nur der Strömungsweg mit Abgasrückführungskühler (
Eine Linie 804 zeigt den Bewegungsverlauf des Tellerventils 324 abhängig von der Drehbewegung des Aktuators 302. In der Aktuator-Ausgangsposition bei einem Aktuatorwinkel von 0° ist das Tellerventil 324 geschlossen. Bei Betätigung des Aktuators in Richtung negativer Aktuatorwinkel öffnet das Tellerventil 324, während das Tellerventil 312 geschlossen bleibt, indem die beiden Enden 303, 305 des Übertragungselements 304 den Mitnehmer 320 mitnehmen. Ausgehend von der Aktuator-Ausgangsposition bei 0° wird so in Richtung negativer Aktuatorwinkel das Tellerventil 324 geöffnet, während das Tellerventil 312 geschlossen bleibt, sodass nur der Bypass (
Der Ast der Öffnungskurve 802 in Richtung positiver Aktuatorwinkel und der Ast der Öffnungskurve 804 in Richtung negativer Aktuatorwinkel weisen zusammen bezogen auf die Aktuator-Ausgangsposition eine in etwa parabelartige Form auf.The branch of the
Der Aktuator 402 ist ein elektrischer Rotationsantrieb, gegebenenfalls kann jedoch auch ein hydraulischer oder pneumatischer Antrieb verwendet werden. Der Aktuator 402 ist mit einem gabelartigen Übertragungselement 404 drehfest verbunden. Die beiden Enden 403, 405 des Übertragungselements 404 dienen als "Kulisse" zur Mitnahme von Mitnehmern 408 oder 420. Der Mitnehmer 408 ist dem Drehtellerventil 412 zugeordnet, der Mitnehmer 420 ist dem Drehtellerventil 424 zugeordnet. Beide Drehtellerventile 412, 424 sind in Schließrichtung mittels einer Feder 416 kraftbeaufschlagt, wobei sich die Feder 416 am Mitnehmer 408 einerseits und am Mitnehmer 420 andererseits anstützt und so auf beide Mitnehmer wirkt.The
Der Bewegungsverlauf der Drehtellerventile 412, 424 abhängig von der Drehbewegung des Aktuators 402 ist im Diagramm 800 in
Der Aktuator 502 ist ein elektrischer Rotationsantrieb, gegebenenfalls kann jedoch auch ein hydraulischer oder pneumatischer Antrieb verwendet werden. Der Aktuator 502 ist mit einem gabelartigen Übertragungselement 504 drehfest verbunden. Die beiden Enden 503, 505 des Übertragungselements 504 dienen als "Kulisse" zur Mitnahme von zur Hubventilachsrichtung rechtswinkligen zapfenförmigen Mitnehmern 508 oder 520, deren Enden in ventilgehäuseseitigen spiralförmigen Kulissen (nicht gezeigt) geführt sind. Die Mitnehmer 508, 520 sind mit den drehbaren Schaften 511, 523 der Hubventile 512, 524 fest verbunden. Mittels einer Feder 516 sind die Hubventile 512, 524 in Schließrichtung kraftbeaufschlagt.The
Bei einer Drehung des Aktuators 502 wird das Übertragungselement 504 entsprechend gedreht und nimmt drehrichtungsabhängig mittels der Enden 503, 505 entweder den Mitnehmer 508 oder den Mitnehmer 520 mit. Dabei werden die Mitnehmer 508 oder 520 entlang der ventilgehäuseseitigen Kulissen bewegt und das jeweilige Hubventil 512 oder 524 öffnet entgegen der Kraft der Feder 516, indem es von einem ventilgehäuseseitigen Ventilsitz abhebt.Upon rotation of the
Der Bewegungsverlauf der Hubventile 512, 524 abhängig von der Drehbewegung des Aktuators 502 ist im Diagramm 800 in
Das Hubventil 612 dient als Abgasrückführungsventil und ermöglicht eine Regelung/Steuerung des gesamten zwischen Einlass und Auslass (
Der Aktuator 602 ist ein elektrischer Rotationsantrieb, gegebenenfalls kann jedoch auch ein hydraulischer oder pneumatischer Antrieb verwendet werden. Der Aktuator 602 ist mit einem Übertragungselement 604, das eine bogenförmige, insbesondere kreisbogenförmige, Kulisse 606 aufweist, drehfest verbunden. Die Kulisse 606 ist von der Aktuatorachse beabstandet, weist in ihrer Mitte einen minimalen Abstand zur Aktuatorachse und in Richtung ihrer Enden einen größer werdenden Abstand zur Aktuatorachse auf. In der Kulisse 606 ist ein Mitnehmer 608 geführt, der mit dem Schaft 610 des Hubventils 612 verbunden ist. Der Mitnehmer 608 ist vorliegend eine Rolle, die am Schaft 610 des Hubventils 612 drehbar gelagert ist. Diese Rolle ist in der Kulisse 606 zweiseitig umfasst geführt und rollt bei Betätigung des Aktuators an der kulissenseitigen Fläche des Übertragungselements 604 ab. Die Aktuatorachse liegt zumindest annähernd rechtwinklig zur Achse des Hubventils 612.The
Bei einer Drehung des Aktuators 502 in Hubventilöffnungsrichtung wird das Übertragungselement 504 entsprechend gedreht und nimmt mittels der bogenförmigen Kulisse den Mitnehmer 608 mit. Dabei wird das Hubventil 612 entgegen der Kraft einer Schließfeder geöffnet.Upon rotation of the
Der Bewegungsverlauf des Hubventils 612 abhängig von der Drehbewegung des Aktuators 602 ist im Diagramm 900 in
Der Aktuator 602 ist außerdem mit einem weiteren, zeigerartigen, Übertragungselement 618 drehfest verbunden. Das aktuatorseitige Ende dieses Übertragungselements 618 ist mit der Aktuatorachse verbunden, das andere Ende weist einen Mitnehmer 620 auf. Dieser Mitnehmer 620 korrespondiert mit einem Übertragungsetement 622, das um eine zum Schaft 610 des Hubventils 612 zumindest annähemd parallele und zur Aktuatorachse zumindest annähernd rechtwinklige Achse verschwenkbar ist. Die Verschwenkachse des Übertragungselements 622 bildet zugleich eine Welle 630 des Klappenventils 624, mit der das Übertragungselement 622 drehfest verbunden ist.The
Das Übertragungselement 622 weist zwei zueinander winklige Arme auf, die eine Ausnehmung einschließen, in der der Mitnehmer 620 aufgenommen ist. Der Mitnehmer 618 ist in der Ausnehmung Übertragungselement 622 spielbehaftet aufgenommen. Ein dritter Arm des Übertragungselements 622 dient zur Aufnahme einer Feder 628, die sich andererseits am Ventilgehäuse abstützt. Das Übertragungselement 622 ist zwischen zwei Endlagen verschwenkbar, die einer offenen und einer geschlossenen Stellung des Klappenventils 624 entsprechen.The
In diesen beiden Endstellungen, dargestellt in den
Bei einer Betätigung des Aktuators 602 verschwenkt das Übertragungselement 618 und damit der Mitnehmer 620. Der Mitnehmer 620 betätigt das Übertragungselement 622 und damit das Klappenventil 624.Upon actuation of the
Der Bewegungsverlauf des Klappenventils 624 abhängig von der Drehbewegung des Aktuators 602 ist ebenfalls im Diagramm 900 in
Ebenso wird bei einer Betätigung des Aktuators ausgehend von der Aktuator-Endposition bei negativem Aktuatorwinkel in Richtung der Aktuator-Ausgangsposition das Klappenventil 624 geschlossen. Die Schließfunktion entspricht dabei in einem Bereich 908 zunächst einem steil fallenden Parabelast. In diesem Betätigungsbereich bis zu einem Aktuatorwinkel von ca. 5° wird das Übertragungselement 622 in Klappenventilschließrichtung mittels des Mitnehmers 620 verschwenkt. Bei Überschreiten des Totpunkts erfolgt ein weiteres Verschwenken des Übertragungselements 622 bedingt durch die Kraft der Feder 628, wobei das Übertragungselement 622 über den Totpunkt "überschnappt" und der Kontakt zwischen Übertragungselement 622 und Mitnehmer 620 vorübergehend gelöst wird. In diesem Abschnitt 909 entspricht die Schließfunktion zumindest annähernd einer Geraden. Bedingt durch die spielbehaftete Aufnahme des Mitnehmers 620 in der Ausnehmung des Übertragungselements 622 ergibt sich bei einer Öffnungsbewegung des Klappenventils 624 ein anderer Zusammenhang zwischen Aktuatorwinkel und Stellung des Klappenventils 624, als bei einer Schließbewegung, es ergibt sich eine Hysterese.Likewise, when the actuator is actuated, starting from the actuator end position with a negative actuator angle in the direction of the actuator starting position, the
Bei Betätigung des Aktuators in Richtung positiver Aktuatorwinkel bleibt das Klappenventil 624 geschlossen, In dieser Betätigungsrichtung erfolgt keine Mitnahme des Übertragungselements 622.When the actuator is actuated in the direction of a positive actuator angle, the
Ausgehend von der Aktuator-Ausgangsposition bei 0° werden so in Richtung negativer Aktuatorwinkel sowohl das Hubventil 612 als auch das Klappenventil 624 geöffnet, sodass der rückgeführte Abgasstrom durch den Bypass 626 am Abgasrückführungskühler vorbei geführt wird. In Richtung positiver Aktuatorwinkel wird nur das Hubventil 612 geöffnet, sodass der rückgeführte Abgasstrom durch den Strömungsweg mit Abgasrückführungskühler (
Claims (11)
- A valve device (100, 200, 600) for an exhaust gas recirculation device (140) of an internal combustion engine (152) comprising at least one inlet (154, 158) and at least one outlet (156, 160), with an inlet (146) on the outlet side of the internal combustion engine, an outlet (148) on the inlet side of the internal combustion engine and a plurality of, especially two, flow paths (142, 144) extending between the inlet (146) and outlet (148) in parallel, at least in portions, the valve device (100, 200, 600) for regulating/controlling the fluid flow flowing between the inlet (146) and outlet (148) and for regulating/controlling the division of this fluid flow between the plurality of flow paths (142, 144) having a first control element (212, 612) and a second control element (224, 624) and a common actuator (202, 602) for actuating both the first control element (212, 612) and the second control element (224, 624), and a first actuator end position, second actuator end position and an actuator starting position located between the first and a second actuator end position being provided, an actuation in the direction of the first actuator end position and in the direction of the second actuator end position being made possible, characterised in that, in the actuator starting position, the first control element (212, 612) and the second control element (224, 624) are closed, upon an actuation proceeding from the actuator starting position in the direction of the first actuator end position, only the first control element (212, 612) is actuated, and upon an actuation in the direction of the second actuator end position, the first control element (212, 612) and the second control element (224, 624) are actuated one after the other and/or simultaneously.
- A valve device (100, 200) according to claim 1, characterised in that the first control element (212) and/or the second control element (224) are spring force-loaded (216, 228) in the closing direction.
- A valve device (100, 600) according to any one of the claims 1-2, characterised in that the first control element (612) and/or the second control element (624) are forcibly guided (606, 608, 620, 622) in the opening and closing direction.
- A valve device (100, 200, 600) according to any one of the claims 1-3, characterised by a first transmission device (204, 206, 207, 208, 209, 604, 606, 608) between the actuator (202, 602) and first control element (212, 612) and a second transmission device (218, 220, 618, 620, 622) between the actuator (202, 602) and second control element (212, 624).
- A valve device (100, 200) according to any one of the claims 1-4, wherein the actuator (202) is a rotary drive, characterised in that the first transmission device (204, 206, 207, 208, 209) and/or the second transmission device is suitable to convert a rotary movement into a linear movement.
- A valve device (100, 200, 600) according to any one of the claims 1-5, characterised in that the first transmission device (204, 206, 207, 208, 209, 604, 606, 608) and or the second transmission device (218, 220, 618, 620, 622) comprises at least one link (206, 207, 209, 604, 606, 622) and at least one driver (208, 608, 620) cooperating therewith.
- A valve device (100, 200, 600) according to any one of the claims 1-6, characterised in that a discontinuous movement transmission between the actuator (202, 602) and second control element (224, 624) is achieved by the second transmission device (218, 220, 618, 620, 622).
- A valve device (100, 200) according to any one of the claims 1-7, characterised in that the first transmission device and/or the second transmission device (218, 220) comprises a toothing (219, 220).
- A valve device (100, 600) according to any one of the claims 1-8, characterised in that the second control element (624) is acted upon by spring force (622, 628) in a bistable manner in the direction of an opening or a closing position.
- A valve device (100, 600) according to any one of the claims 1-9, characterised in that the second control element (624) can be displaced between the opening position or closing position by means of the actuator (602) and the second transmission device (618, 620, 622) while passing over a dead centre position.
- A valve device (100, 600) according to any one of the claims 1-10, characterised in that the second transmission device (618, 620, 622) comprises transmission elements (620, 622) with play and with a frictional connection which changes depending on the actuating direction, so that a hysteresis effect (906, 908) is achieved.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008005591A DE102008005591A1 (en) | 2008-01-22 | 2008-01-22 | Valve device for an exhaust gas recirculation device |
PCT/EP2008/010496 WO2009092422A1 (en) | 2008-01-22 | 2008-12-11 | Valve unit for an exhaust gas recirculation unit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2212539A1 EP2212539A1 (en) | 2010-08-04 |
EP2212539B1 true EP2212539B1 (en) | 2012-02-08 |
Family
ID=40404503
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08871472A Active EP2212539B1 (en) | 2008-01-22 | 2008-12-11 | Valve unit for an exhaust gas recirculation unit |
Country Status (6)
Country | Link |
---|---|
US (1) | US8065992B2 (en) |
EP (1) | EP2212539B1 (en) |
CN (1) | CN101896713B (en) |
AT (1) | ATE544945T1 (en) |
DE (1) | DE102008005591A1 (en) |
WO (1) | WO2009092422A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008057128A1 (en) * | 2008-11-13 | 2010-05-20 | Gustav Wahler Gmbh U. Co. Kg | Valve device for controlling an exhaust gas flow recirculated and supplied by an internal combustion engine |
US20110108013A1 (en) * | 2009-11-09 | 2011-05-12 | International Engine Intellectual Property Company, Llc | Exhaust gas recirculation valve with bypass capability and method |
DE102010022736A1 (en) * | 2010-06-04 | 2011-12-08 | Mahle International Gmbh | Actuator, exhaust gas recirculation valve, exhaust gas turbocharger |
JP5287953B2 (en) * | 2011-04-27 | 2013-09-11 | 株式会社デンソー | Low pressure EGR device |
FR2978998B1 (en) * | 2011-08-08 | 2013-07-26 | Sonceboz Automotive Sa | COMPACT DOSING DEVICE |
DE102011054082B3 (en) * | 2011-09-30 | 2012-12-13 | Pierburg Gmbh | locking device |
JP5510428B2 (en) * | 2011-10-31 | 2014-06-04 | 株式会社デンソー | Low pressure EGR device |
FR2990726B1 (en) * | 2012-05-15 | 2015-08-21 | Valeo Sys Controle Moteur Sas | TWO-WAY DOSER AND APPLICATIONS OF THE SAME |
FR2990741B1 (en) * | 2012-05-15 | 2016-07-29 | Valeo Systemes De Controle Moteur | FLUID CIRCULATION VALVE, IN PARTICULAR FOR A MOTOR VEHICLE, AND THERMAL CONDITIONING DEVICE COMPRISING SUCH A VALVE |
KR20140085134A (en) * | 2012-12-27 | 2014-07-07 | 현대자동차주식회사 | Exhaust gas recirculation valve device for vehicle |
FR3019254B1 (en) * | 2014-04-01 | 2016-04-15 | Valeo Systemes De Controle Moteur | VALVE WITH IMPROVED VALVE BODY AND METHOD OF MANUFACTURING SUCH VALVE |
FR3022968B1 (en) * | 2014-06-30 | 2016-07-29 | Valeo Systemes De Controle Moteur | FLUID VALVE REGULATING ASSEMBLY |
CN106401809B (en) * | 2015-07-31 | 2020-11-03 | 无锡法雷奥汽车零配件系统有限公司 | Valve for an internal combustion engine of a motor vehicle and valve assembly comprising such a valve |
KR101889040B1 (en) * | 2016-09-06 | 2018-08-16 | 삼보모터스주식회사 | Intake Air Control Integrated EGR Valve For Vehicle |
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US5617726A (en) * | 1995-03-31 | 1997-04-08 | Cummins Engine Company, Inc. | Cooled exhaust gas recirculation system with load and ambient bypasses |
DE19733964B4 (en) * | 1997-08-06 | 2010-04-29 | Volkswagen Ag | Valve arrangement for controlling a recirculated exhaust gas flow |
GB2329001B (en) | 1997-09-04 | 2001-09-05 | Gen Motors Corp | Exhaust gas recirculation valve |
LU90480B1 (en) | 1999-11-29 | 2001-05-30 | Delphi Tech Inc | Exhaust gas re-circulation device for an internal combustion engine |
DE10025877C2 (en) * | 2000-05-25 | 2002-04-11 | Siebe Automotive Deutschland Gmbh | Exhaust gas recirculation system |
DE10032184A1 (en) * | 2000-07-01 | 2002-01-10 | Bosch Gmbh Robert | Device for cooling an internal combustion engine |
EP1270924A3 (en) | 2001-06-28 | 2004-01-07 | Delphi Technologies, Inc. | Integrated intake manifold assembly for an internal combustion engine |
DE10221711A1 (en) * | 2002-05-16 | 2003-11-27 | Pierburg Gmbh | valve system |
DE60334758D1 (en) | 2002-07-02 | 2010-12-16 | Borgwarner Inc | gas valve |
EP1378855B1 (en) | 2002-07-05 | 2007-10-17 | Honda Research Institute Europe GmbH | Exploiting ensemble diversity for automatic feature extraction |
US7007680B2 (en) * | 2003-08-07 | 2006-03-07 | Mack Trucks, Inc. | Cooler bypass valve system and method |
AU2003304523A1 (en) * | 2003-10-17 | 2005-05-19 | Honeywell International Inc. | Internal bypass exhaust gas cooler |
JP4323333B2 (en) * | 2004-01-19 | 2009-09-02 | 株式会社マーレ フィルターシステムズ | Exhaust gas recirculation device for internal combustion engine |
SE526824C2 (en) | 2004-03-26 | 2005-11-08 | Stt Emtec Ab | Valve |
EP1801407B1 (en) * | 2004-09-28 | 2012-03-28 | T.RAD Co., Ltd. | Egr cooler |
US7168250B2 (en) * | 2005-04-21 | 2007-01-30 | International Engine Intellectual Property Company, Llc | Engine valve system and method |
JP2007023911A (en) | 2005-07-19 | 2007-02-01 | Denso Corp | Exhaust gas re-circulation device |
KR101373273B1 (en) * | 2006-03-22 | 2014-03-11 | 보그워너 인코포레이티드 | Integrated charge air and egr valve |
US7963274B2 (en) * | 2006-03-22 | 2011-06-21 | Borgwarner Inc. | Two component low pressure EGR module |
-
2008
- 2008-01-22 DE DE102008005591A patent/DE102008005591A1/en not_active Withdrawn
- 2008-12-11 AT AT08871472T patent/ATE544945T1/en active
- 2008-12-11 CN CN2008801199994A patent/CN101896713B/en active Active
- 2008-12-11 WO PCT/EP2008/010496 patent/WO2009092422A1/en active Application Filing
- 2008-12-11 EP EP08871472A patent/EP2212539B1/en active Active
-
2010
- 2010-07-07 US US12/831,670 patent/US8065992B2/en active Active
Also Published As
Publication number | Publication date |
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US8065992B2 (en) | 2011-11-29 |
DE102008005591A1 (en) | 2009-07-23 |
EP2212539A1 (en) | 2010-08-04 |
ATE544945T1 (en) | 2012-02-15 |
US20110023838A1 (en) | 2011-02-03 |
CN101896713B (en) | 2013-05-22 |
CN101896713A (en) | 2010-11-24 |
WO2009092422A1 (en) | 2009-07-30 |
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