CN109030006B - Detection method and system of continuous variable valve lift mechanism - Google Patents
Detection method and system of continuous variable valve lift mechanism Download PDFInfo
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- CN109030006B CN109030006B CN201710431954.1A CN201710431954A CN109030006B CN 109030006 B CN109030006 B CN 109030006B CN 201710431954 A CN201710431954 A CN 201710431954A CN 109030006 B CN109030006 B CN 109030006B
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
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Abstract
The invention discloses a detection method and a system of a continuous variable valve lift mechanism, and the method comprises the steps of respectively carrying out lift debugging on the continuous variable valve lift mechanism, carrying out engine hot test, engine hot start test and engine cold start test on an engine after the continuous variable valve lift mechanism is subpackaged; judging whether the self-learning of the lift debugging, the self-learning of the engine hot test, the self-learning of the engine hot start test and the self-learning of the engine cold start test are successful or not; if not, testing whether the continuous variable valve lift mechanism has a fault or not, and replacing a fault part. According to the method provided by the embodiment of the invention, the self-learning reliability of the continuous variable valve lift mechanism is improved, so that the continuous variable valve lift mechanism can normally work in the processes of heat engine starting and cold starting.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a detection method and a detection system for a continuous variable valve lift mechanism.
Background
With the increasing severity of environmental problems, low emission and environmental protection become the precondition for engines to enter the market, the traditional gasoline engine changes the load of the engine by changing the air inflow amount adjusted by the throttle valve, under the working condition of low load, the opening degree of the throttle valve is very small, the vacuum degree behind the throttle valve is very large, and the pumping loss in the air exchange process of the engine is very large, which is an important reason that the working efficiency of the gasoline engine is lower than that of a diesel engine. In order to improve the efficiency of an engine, a continuous variable valve lift technology is provided, because a large number of electric control components of a continuous variable valve lift mechanism are needed, the test of the large number of electric control components of the continuous variable valve lift mechanism is needed, and in the related technology, the test is not comprehensive, so that the reliability of the continuous variable valve lift mechanism is difficult to guarantee.
Disclosure of Invention
In view of this, the present invention is directed to a method for detecting a continuously variable valve lift mechanism, which improves the reliability of self-learning of the continuously variable valve lift mechanism, so that the continuously variable valve lift mechanism can work normally in the processes of hot engine starting and cold starting.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of detecting a continuously variable valve lift mechanism comprising an eccentric shaft assembly (9), said eccentric shaft assembly (9) comprising a spindle (12) and an eccentric (14), said spindle (12) being adapted to be connected to a drive unit, said eccentric (14) being angularly adjustably sleeved outside said spindle (12) and being clearance fitted to said spindle (12), said method comprising: after the continuous variable valve lift mechanism is subpackaged, respectively carrying out lift debugging on the continuous variable valve lift mechanism, and carrying out engine hot test, engine hot start test and engine cold start test on an engine; judging whether the self-learning of the lift debugging, the self-learning of the engine hot test, the self-learning of the engine hot start test and the self-learning of the engine cold start test are successful or not; if not, testing whether the continuous variable valve lift mechanism has a fault or not, and replacing a fault part.
Further, the testing whether the continuous variable valve lift mechanism has a fault and replacing the fault part includes: testing whether a motor and an electric control component of the continuous variable valve lift mechanism have faults or not; if yes, the corresponding fault piece is replaced.
Further, when the continuously variable valve lift mechanism has a fault, the method further comprises the following steps: measuring the torque of the continuous variable valve lift mechanism under a heat engine; and analyzing the fault reason according to the comparison result of the torque under the heat engine of the continuous variable valve lift mechanism and the first standard value.
Further, when the continuously variable valve lift mechanism has a fault, the method further comprises the following steps: measuring the torque of the continuous variable valve lift mechanism under the cold machine; and analyzing the fault reason according to the comparison result of the torque under the cold machine of the continuous variable valve lift mechanism and the second standard value.
Compared with the prior art, the detection method of the continuous variable valve lift mechanism has the following advantages:
the detection method of the continuous variable valve lift mechanism provided by the embodiment of the invention improves the self-learning reliability of the continuous variable valve lift mechanism, so that the continuous variable valve lift mechanism can normally work in the processes of heat engine starting and cold starting. In addition, the mechanism may be stuck in consideration of the expansion and contraction effect of the parts and the error in the installation process. The clamping stagnation can cause the self-learning failure of the continuous variable valve lift mechanism, so that the testing process comprises the self-learning test in the hot-test process and the self-learning detection in the hot-engine starting and cold-engine starting processes, the detection is more comprehensive, and the reliability of the continuous variable valve lift mechanism is improved.
The invention also aims to provide a detection method of the continuous variable valve lift mechanism, and the system improves the self-learning reliability of the continuous variable valve lift mechanism, so that the continuous variable valve lift mechanism can normally work in the processes of heat engine starting and cold starting.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a detection system of a continuously variable valve lift mechanism, the continuously variable valve lift mechanism comprising an eccentric shaft assembly (9), the eccentric shaft assembly (9) comprising a spindle (12) and an eccentric (14), the spindle (12) being adapted to be connected to a drive unit, the eccentric (14) being angularly adjustably sleeved outside the spindle (12) and being clearance fitted with the spindle (12), the system comprising: the test module is used for respectively carrying out lift debugging on the continuous variable valve lift mechanism, and carrying out engine hot test, engine hot start test and engine cold start test on the engine after the continuous variable valve lift mechanism completes split charging; the judging module is used for judging whether the self-learning of the lift debugging, the self-learning of the engine hot test, the self-learning of the engine hot start test and the self-learning of the engine cold start test are successful or not; and the detection module is used for testing whether the continuous variable valve lift mechanism has a fault or not and replacing a fault part when the self-learning of the lift debugging, the self-learning of the engine hot test, the self-learning of the engine hot start test and the self-learning of the engine cold start test are not successful.
Further, the detection module is configured to: testing whether a motor and an electric control component of the continuous variable valve lift mechanism have faults or not; if yes, the corresponding fault piece is replaced.
Further, the detection module is also used for measuring the torque of the continuous variable valve lift mechanism under a heat engine when the continuous variable valve lift mechanism has a fault; and analyzing the fault reason according to the comparison result of the torque under the heat engine of the continuous variable valve lift mechanism and the first standard value.
Further, the detection module is also used for measuring the torque of the continuous variable valve lift mechanism under a cold machine; and analyzing the fault reason according to the comparison result of the torque under the cold machine of the continuous variable valve lift mechanism and the second standard value.
Compared with the prior art, the detection system of the continuous variable valve lift mechanism and the detection method of the continuous variable valve lift mechanism have the same advantages, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of an eccentric shaft assembly according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of an eccentric shaft assembly at a fastener according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an eccentric wheel according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a variable valve lift mechanism according to an embodiment of the present invention;
FIG. 5 is a flowchart of a valve lift debugging method of a continuously variable valve lift mechanism according to an embodiment of the present invention;
FIG. 6 is a flowchart of a method of detecting a continuously variable valve lift mechanism according to an embodiment of the present invention;
FIG. 7 is a detailed flowchart of a method of detecting a continuously variable valve lift mechanism according to an embodiment of the present invention;
fig. 8 is a block diagram showing the structure of a detection system of the continuously variable valve lift mechanism according to the embodiment of the present invention.
Description of reference numerals:
the variable valve lift mechanism 100 is provided with,
the device comprises a camshaft 1, a middle swing arm 2, an adjusting pin 3, a roller rocker arm 4, a valve 5, a connecting arm fixing pin 6, a connecting arm 7, an adjusting arm 8, an eccentric shaft assembly 9, a control motor 10, a minimum lift limiting pin 11a, a maximum lift limiting pin 11b, a mandrel 12, a worm wheel 13, an eccentric wheel 14, an eccentric circle section 14a, a fastening section 14b, an arc-shaped surface 14c, an adjusting hole 14d, a gasket 15, a fastening piece 16, a bearing assembly 17, a check ring 18, a lift sensor transmission pin 19, a reset mechanism 20, a detection system 800 of a continuous variable valve lift mechanism, a test module 810, a judgment module 820 and a detection module 830.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 4, the variable valve lift mechanism 100 may include a camshaft 1, an intermediate swing arm 2, an adjustment pin 3, a roller rocker arm 4, a valve 5, a connecting arm fixing pin 6, a connecting arm 7, an adjustment arm 8, an eccentric shaft assembly 9, a control motor 10, and a return mechanism 20. The variable valve lift mechanism 100 may be a continuously variable valve lift mechanism.
The camshaft 1 is connected with a crankshaft of an engine, for example, the camshaft can be connected through chain transmission, the camshaft 1 rotates and drives the middle swing arm 2 to swing by taking the adjusting pin 3 as a rotating center, the middle swing arm 2 drives the roller swing arm 4 to control the opening and closing of the valve 5, and the reset mechanism 20 is used for driving the middle swing arm 2 to reset.
The control motor 10 may be coupled to the eccentric shaft assembly 9 for controlling the eccentric shaft assembly 9 to rotate clockwise or counterclockwise, for example, the output shaft of the control motor 10 may be configured as a worm, the eccentric shaft assembly 9 may include a worm wheel 13, and the worm 13 is engaged with the worm wheel for coupling the control motor 10 to the eccentric shaft assembly 9.
The eccentric shaft assembly 9 is provided with an eccentric wheel 14, two ends of the adjusting arm 8 are respectively in shaft hole clearance fit with the eccentric wheel 14 and the adjusting pin 3, two ends of the connecting arm 7 are respectively connected with the adjusting pin 3 and the connecting arm fixing pin 6, the connecting arm fixing pin 6 can be fixedly arranged on the cylinder cover, and the connecting arm 7 is used for limiting the movement track of the adjusting pin 3.
When the eccentric wheel 14 rotates, the adjusting arm 8 drives the adjusting pin 3 to swing by taking the connecting arm fixing pin 6 as a rotating center, and the adjusting pin 3 is the rotating center of the middle swing arm 2, so that the position of the rotating center of the middle swing arm 2 can be adjusted by rotating the eccentric wheel 14, and the valve lift can be continuously changed.
The eccentric shaft assembly 9 according to an embodiment of the present invention is described below.
As shown in fig. 1 to 4, the eccentric shaft assembly 9 is used for the variable valve lift mechanism 100, and the eccentric shaft assembly 9 includes: mandrel 12, eccentric 14, fastener 16.
The spindle 12 is adapted to be connected to a driving unit, the driving unit can drive the spindle 12 to rotate clockwise or counterclockwise, and the driving unit can be the control motor 10.
The eccentric wheel 14 is sleeved outside the mandrel 12 in an angle-adjustable manner, the eccentric wheel 14 is in clearance fit with the mandrel 12, the fastening piece 16 is detachably connected with the eccentric wheel 14 and the mandrel 12, the fastening piece 16 is used for fixedly connecting the eccentric wheel 14 with the mandrel 12, so that when the mandrel 12 is driven by the driving unit, the eccentric wheel 14 can follow up, and the eccentric wheel 14 can be connected with the adjusting arm 8 to drive the adjusting pin 3 to swing, so that the valve lift corresponding to the eccentric wheel 14 at present is changed.
It will be appreciated that loosening the fastener 16 allows the eccentric 14 to rotate on the mandrel 12 through a range of angles, rotating the eccentric 14 to a target position and then tightening the fastener 16 to achieve a secure connection of the eccentric 14 to the mandrel 12.
The valve lifts of all cylinders can be basically adjusted to be consistent by adjusting the eccentric wheels 14 corresponding to the valves 5 of all cylinders, the problem of inconsistent valve lifts of all cylinders of the engine caused by casting, machining, assembly errors and other reasons of parts is solved, and further the adverse effects of inconsistent cylinder lifts on development of system control programs and control of engine air intake and combustion are reduced. Further, the limit value of the valve lift of the variable valve lift mechanism 100 can be changed within a certain range by the rotation of the eccentric 14 relative to the spindle 12.
According to the eccentric shaft assembly 9 provided by the embodiment of the invention, the processing difficulty and the manufacturing cost can be effectively reduced, the valve lift of each cylinder is easy to adjust, the problem of inconsistent valve lift of each cylinder caused by processing errors of parts and the like can be solved, and the limit value of the valve lift of the variable valve lift mechanism 100 can be changed within a certain range.
According to the variable valve lift mechanism 100 of the embodiment of the invention, the valve lift is easily adjusted.
In some preferred embodiments of the present invention, as shown in fig. 1 and 4, the eccentric shaft assembly 9 further comprises: the turbine is in interference press-fitting with the mandrel 12 and is suitable for being connected with a driving unit, the driving unit can be a control motor 10, the worm wheel 13 can be provided with a minimum lift limiting pin 11a and a maximum lift limiting pin 11b in the circumferential direction, the minimum lift limiting pin 11a and the maximum lift limiting pin 11b and a limiting structure on a cylinder cover can form an eccentric shaft angle limiting mechanism, and the minimum lift and the maximum lift of the variable valve lift mechanism 100 are restrained. Two axial end surfaces of the worm wheel 13 are pushing surfaces, and form an eccentric shaft axial limit with a cylinder cover worm wheel 13 mounting groove.
The eccentric shaft assembly 9 may further include: the lift sensor driving pin 19 is arranged in an end hole of the shaft core in an interference press-fitting mode, a flat opening end of the lift sensor driving pin 19 is used for installing a lift sensor inductance element, and the lift sensor inductance element is used for feeding back an eccentric shaft rotating angle to the control unit.
In some preferred embodiments of the present invention, as shown in fig. 3, the eccentric 14 may have: the eccentric circle section 14a and the fastening section 14b are connected in the axial direction, and the eccentric circle section 14a and the fastening section 14b may be integrally formed.
The eccentric circle section 14a is suitable for being connected with the adjusting arm 8 of the valve 5, the fastening section 14b is provided with an adjusting hole 14d, the fastening piece 16 penetrates through the adjusting hole 14d, the fastening piece 16 is fixedly connected with the mandrel 12, the fastening piece 16 can be a screw, the mandrel 12 can be provided with a threaded hole extending in the radial direction, and the fastening piece 16 penetrates through the adjusting hole 14d and is in threaded connection with the threaded hole so as to press the eccentric wheel 14 and the mandrel 12 tightly.
As shown in fig. 2 and 3, the adjustment hole 14d may be elongated, and the adjustment hole 14d extends in the circumferential direction. The adjustment hole 14d is used to adjust the intake side valve lift of each cylinder. The use of the elongated adjustment hole 14d allows the angle of the eccentric 14 to be continuously adjustable.
As shown in fig. 2 and 3, the fastening section 14b may have a polygonal cross-section, such as a hexagonal cross-section, which facilitates the clamping of the fastening section 14b and the rotation of the fastening section 14 b.
As shown in fig. 1-3, the eccentric shaft assembly 9 may further include: the gasket 15, the gasket 15 can press from both sides and establish between fastener 16 and fastening section 14b, and the gasket 15 all forms face contact with fastener 16 and fastening section 14b, the surface that the head of gasket 15 and screw correspond can be the plane, fastening section 14b can have arcwall face 14c, the regulation hole 14d runs through arcwall face 14c, the surface that the gasket 15 is relative with arcwall face 14c is the arc, like this, the gasket 15 can assist fastener 16 to lock dabber 12 and eccentric wheel 14, and the cooperation of the arcwall face 14c of the arc clamping surface of gasket 15 and eccentric wheel 14 is favorable to eccentric wheel 14 and dabber 12 all can be screwed up fixedly under each angle.
Preferably, as shown in fig. 1-2, each fastening segment 14b may have a plurality of arcuate surfaces 14c, the plurality of arcuate surfaces 14c being axially spaced apart, each eccentric 14 having a plurality of eccentric segments 14a, the plurality of eccentric segments 14a being axially spaced apart. For example, each eccentric 14 has two eccentric circular segments 14a, a fastening segment 14b is provided between the two eccentric circular segments 14a, and arc-shaped surfaces 14c may be provided on the fastening segment 14b near both ends of the two eccentric circular segments 14a, so that the eccentric 14 and the mandrel 12 are connected more firmly and the distribution of the forces is more balanced.
As shown in fig. 1, the eccentric 14 may be plural, and the plural eccentrics 14 are spaced apart in the axial direction. For example, the eccentric wheel 14 may be four, corresponding to four cylinders of a four-cylinder engine.
The eccentric shaft assembly 9 further comprises: a plurality of bearing assemblies 17, the plurality of bearing assemblies 17 and the plurality of eccentric wheels 14 are arranged in an axially staggered manner, the bearing assembly 17 between two adjacent eccentric wheels 14 is positioned by the corresponding two eccentric wheels 14, and the bearing assembly 17 at the end is positioned by the adjacent eccentric wheels 14 and the retainer ring 18. The above-described spacing manner makes full use of the eccentric 14, which can reduce the number of parts. The bearing assembly may comprise a needle bearing.
As shown in fig. 1, the end of the turbine remote from the eccentric 14 may also be provided with a bearing assembly 17, and the bearing assembly 17 may be positioned by two collars 18.
FIG. 5 is a flow chart of a valve lift commissioning method of a continuously variable valve lift mechanism according to one embodiment of the present invention. As shown in fig. 5, the valve lift debugging method of the continuously variable valve lift mechanism according to one embodiment of the present invention includes the steps of:
s501: and driving the eccentric shaft assembly (9) to rotate to a minimum lift position on a lift debugging station.
For example: the cylinder cover assembly provided with the continuous variable valve lift mechanism is placed on valve lift consistency debugging equipment (lift debugging station).
S502: and after oil filling of the hydraulic tappet is finished, the valve is driven to be opened and closed so as to detect the initial lift curve of the valve. For example: and controlling the camshaft to rotate for a preset time to drive the valve to open and close, and detecting the initial lift curve of the valve in the process.
In one embodiment of the invention, the predetermined time is 6 seconds. Specifically, the main oil duct supplies oil to complete oil charging of the hydraulic tappet. The eccentric shaft assembly is driven by a control motor of the continuous variable valve lift mechanism to rotate to a minimum lift position, the cam shaft rotates for 6 seconds, and the valve lift sensor records a valve lift curve (namely, a valve initial lift curve) while driving the valve to open and close.
S503: and determining an initial valve lift value according to the valve initial lift curve. In a specific example of the present invention, a plurality of peak values may be taken from the valve initial lift curve, and an average value of the plurality of peak values may be taken as the initial valve lift value.
Taking 10 as an example, the valve lift debugging equipment takes 10 wave peak values of the middle position according to the collected valve initial lift curve, and obtains an average value as an initial valve lift value.
S504: and obtaining the angle of the eccentric wheel (14) according to the initial valve lift value, and calculating the difference value between the angle of the eccentric wheel (14) and the standard angle. That is, according to the initial valve lift value, the angle of the eccentric wheel (namely, the angle of the eccentric wheel (14)) is calculated, and then the difference value between the angle of the eccentric wheel (14) and the theoretical angle (namely, the standard angle) is calculated.
S505: the angle of the eccentric wheel (14) sleeved outside the mandrel (12) is adjusted according to the difference value between the angle of the eccentric wheel (14) and the standard angle. The eccentric wheel can be firstly clamped through an eccentric wheel adjusting tool, then the eccentric wheel pressing block bolt is loosened, and then the position of the eccentric wheel is adjusted, wherein the adjustment amount is the difference value between the angle of the eccentric wheel (14) and a standard angle. And after the angle is adjusted, screwing the eccentric wheel pressing block bolt.
Specifically, referring to fig. 1-4, the eccentric 14 is disposed on the mandrel 12 in an angularly adjustable manner, the eccentric 14 is in clearance fit with the mandrel 12, the fastening member 16 is detachably connected to the eccentric 14 and the mandrel 12, the fastening member 16 is used to fixedly connect the eccentric 14 to the mandrel 12, so that when the mandrel 12 is driven by the driving unit, the eccentric 14 can follow up, and the eccentric 14 can be connected to the adjusting arm 8 to drive the adjusting pin 3 to swing, thereby changing the valve lift corresponding to the eccentric 14.
According to the valve lift debugging method of the continuous variable valve lift mechanism, the valve lift value can be simply and conveniently adjusted to be close to a theoretical value, and the difference of the valve lifts of the four cylinders caused by the size difference of parts of the four cylinders and the fit clearance difference is reduced by adjusting the position of the eccentric wheel of each cylinder. Noise and vibration caused by uneven combustion of each cylinder of the engine are improved, so that the dynamic property, emission and oil consumption of the engine in the actual working process are relatively good, and the use experience of the vehicle is improved.
After the angles of a plurality of eccentric wheels (14) are adjusted, the method further comprises the following steps: verifying whether the final valve lift value meets a preset requirement; if so, judging that the continuous variable valve lift mechanism is qualified; and if not, carrying out valve lift debugging on the continuous variable valve lift mechanism again.
Specifically, verifying whether the final valve lift value meets a predetermined requirement includes: controlling the camshaft to rotate for a preset time again to drive the valve to be opened and closed, and detecting a final lift curve of the valve in the process; determining a final valve lift value according to the final valve lift curve; and determining whether the continuous variable valve lift mechanism is qualified or not according to the comparison result of the final valve lift value and the standard lift value.
Taking the continuous variable valve lift mechanism with 4 eccentric wheels as an example, after the 4 eccentric wheels are debugged, the camshaft is controlled to rotate for 6 seconds again, the valve lift sensor measures the valve lift values of all the valves, the valve lift values are compared with theoretical values, whether the continuous variable valve lift mechanism is qualified or not is judged simply and conveniently according to the comparison result, in this way, qualified products can be cleaned and assembled in the next step, and the unqualified products are debugged once again after the roller rocker arm is replaced.
According to the valve lift debugging method of the continuous variable valve lift mechanism, the valve lift value can be simply and conveniently adjusted to be close to a theoretical value, and the difference of the valve lifts of the four cylinders caused by the size difference and the fit clearance difference of parts of the four cylinders is reduced by adjusting the position of the eccentric wheel of each cylinder. Noise and vibration caused by uneven combustion of each cylinder of the engine are improved, so that the dynamic property, emission and oil consumption of the engine in the actual working process are relatively good, and the use experience of the vehicle is improved.
Fig. 6 is a flowchart of a detection method of the continuously variable valve lift mechanism according to the embodiment of the present invention. As shown in fig. 6 in combination with fig. 7, the method for detecting a continuously variable valve lift mechanism according to an embodiment of the present invention includes the steps of:
s601: after the continuously variable valve lift mechanism is subpackaged, respectively carrying out lift debugging on the continuously variable valve lift mechanism, and carrying out engine hot test, engine hot start test and engine cold start test on an engine.
S602: and judging whether the self-learning of the lift debugging, the self-learning of the engine hot test, the self-learning of the engine hot start test and the self-learning of the engine cold start test are successful or not.
S603: if not, testing whether the continuous variable valve lift mechanism has a fault or not, and replacing a fault part.
Specifically, whether a motor and an electric control component of the continuous variable valve lift mechanism have faults or not is tested; if yes, the corresponding fault piece is replaced.
Further, when the continuously variable valve lift mechanism has a failure, the method further includes: measuring the torque of the continuous variable valve lift mechanism under a heat engine; and analyzing the fault reason according to the comparison result of the torque under the heat engine of the continuous variable valve lift mechanism and the first standard value.
Further, when the continuously variable valve lift mechanism has a failure, the method further includes: measuring the torque of the continuous variable valve lift mechanism under the cold machine; and analyzing the fault reason according to the comparison result of the torque under the cold machine of the continuous variable valve lift mechanism and the second standard value.
Specifically, as shown in fig. 7, whether the self-learning of the continuously variable valve lift mechanism is successful or not determines whether the continuously variable valve lift mechanism can normally perform the continuously variable function of the valve lift. The reliability and the accuracy of the continuous variable valve lift mechanism are tested through four steps on an engine production line. The method comprises the steps of carrying out valve lift debugging after the split charging of the continuous variable valve lift mechanism is completed, carrying out self-learning once in the process, carrying out self-learning once in the engine hot-test process, carrying out self-learning once in the engine hot-start process, and carrying out self-learning once in the engine cold-start process. In the four self-learning test processes, if any one process fails to self-learn, troubleshooting is carried out in the following manner:
controlling whether the motor and the circuit element are in failure; and comparing the mechanism torque with a standard value under the heat engine state and the cold engine state, and judging whether a part causes mechanism clamping stagnation. Checking out a fault part, performing split charging of a continuous variable valve lift mechanism, and replacing a fault part; and completing the split charging of the continuous variable valve lift mechanism, and re-performing the self-learning detection of the engine until the split charging is successful.
The detection method of the continuous variable valve lift mechanism provided by the embodiment of the invention improves the self-learning reliability of the continuous variable valve lift mechanism, so that the continuous variable valve lift mechanism can normally work in the processes of heat engine starting and cold starting. In addition, the mechanism may be stuck in consideration of the expansion and contraction effect of the parts and the error in the installation process. The clamping stagnation can cause the self-learning failure of the continuous variable valve lift mechanism, so that the testing process comprises the self-learning test in the hot-test process and the self-learning detection in the hot-engine starting and cold-engine starting processes, the detection is more comprehensive, and the reliability of the continuous variable valve lift mechanism is improved.
As shown in fig. 8, an embodiment of the present invention discloses a detection system 800 for a continuously variable valve lift mechanism, comprising: a test module 810, a determination module 820, and a detection module 830.
The testing module 810 is used for respectively performing lift debugging on the continuous variable valve lift mechanism, engine hot test on the engine, engine hot start test and engine cold start test after the continuous variable valve lift mechanism is subpackaged. The determination module 820 is used to determine whether the self-learning of the lift debugging, the self-learning of the engine hot-test, the self-learning of the engine hot-start test, and the self-learning of the engine cold-start test are all successful. The detection module 830 is configured to test whether the continuous variable valve lift mechanism has a fault and replace the faulty component when the self-learning of the lift debugging, the self-learning of the engine hot test, the self-learning of the engine hot start test, and the self-learning of the engine cold start test are not successful.
In an embodiment of the present invention, the detecting module 830 is configured to: testing whether a motor and an electric control component of the continuous variable valve lift mechanism have faults or not; if yes, the corresponding fault piece is replaced.
In an embodiment of the invention, the detection module 830 is further configured to measure a torque under a heat engine of the continuous variable valve lift mechanism when the continuous variable valve lift mechanism has a fault; and analyzing the fault reason according to the comparison result of the torque under the heat engine of the continuous variable valve lift mechanism and the first standard value.
In one embodiment of the invention, the detection module 830 is further configured to measure cold torque of the continuous variable valve lift mechanism; and analyzing the fault reason according to the comparison result of the torque under the cold machine of the continuous variable valve lift mechanism and the second standard value.
The detection system of the continuous variable valve lift mechanism provided by the embodiment of the invention improves the self-learning reliability of the continuous variable valve lift mechanism, so that the continuous variable valve lift mechanism can normally work in the processes of heat engine starting and cold starting. In addition, the mechanism may be stuck in consideration of the expansion and contraction effect of the parts and the error in the installation process. The clamping stagnation can cause the self-learning failure of the continuous variable valve lift mechanism, so that the testing process comprises the self-learning test in the hot-test process and the self-learning detection in the hot-engine starting and cold-engine starting processes, the detection is more comprehensive, and the reliability of the continuous variable valve lift mechanism is improved.
It should be noted that a specific implementation manner of the detection system of the continuous variable valve lift mechanism in the embodiment of the present invention is similar to a specific implementation manner of the detection method of the continuous variable valve lift mechanism in the embodiment of the present invention, and please refer to the description of the method part specifically, and details are not described here in order to reduce redundancy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method of checking a continuously variable valve lift mechanism, characterized in that the continuously variable valve lift mechanism comprises an eccentric shaft assembly (9), the eccentric shaft assembly (9) comprising a spindle (12) and an eccentric (14), the spindle (12) being adapted to be connected to a drive unit, the eccentric (14) being angularly adjustable around the spindle (12) and being in clearance fit with the spindle (12), the method comprising:
after the continuous variable valve lift mechanism is subpackaged, carrying out lift debugging on the continuous variable valve lift mechanism;
when the self-learning of the lift debugging is successful, carrying out engine hot test, engine hot start test and engine cold start test on the engine;
judging whether the self-learning of the lift debugging, the self-learning of the engine hot test, the self-learning of the engine hot start test and the self-learning of the engine cold start test are successful or not;
and when judging that the self-learning of the lift debugging fails, or when any one of the self-learning of the engine hot test, the self-learning of the engine hot start test and the self-learning of the engine cold start test fails, testing whether the continuous variable valve lift mechanism has a fault or not, and replacing a fault part.
2. The detection method of the continuous variable valve lift mechanism according to claim 1, wherein the testing whether the continuous variable valve lift mechanism has a fault and replacing the fault member comprises:
testing whether a motor and an electric control component of the continuous variable valve lift mechanism have faults or not;
if yes, the corresponding fault piece is replaced.
3. The detection method of the continuously variable valve lift mechanism according to claim 1 or 2, characterized by, when there is a failure in the continuously variable valve lift mechanism, further comprising:
measuring the torque of the continuous variable valve lift mechanism under a heat engine;
and analyzing the fault reason according to the comparison result of the torque under the heat engine of the continuous variable valve lift mechanism and the first standard value.
4. The detection method of the continuously variable valve lift mechanism according to claim 1 or 2, characterized by, when there is a failure in the continuously variable valve lift mechanism, further comprising:
measuring the torque of the continuous variable valve lift mechanism under the cold machine;
and analyzing the fault reason according to the comparison result of the torque under the cold machine of the continuous variable valve lift mechanism and the second standard value.
5. A detection system of a continuously variable valve lift mechanism, characterized in that the continuously variable valve lift mechanism comprises an eccentric shaft assembly (9), the eccentric shaft assembly (9) comprises a mandrel (12) and an eccentric wheel (14), the mandrel (12) is suitable for being connected with a driving unit, the eccentric wheel (14) is sleeved outside the mandrel (12) in an angle-adjustable manner and is in clearance fit with the mandrel (12), and the system comprises:
the test module is used for carrying out lift debugging on the continuous variable valve lift mechanism after the continuous variable valve lift mechanism completes split charging, and carrying out engine hot test, engine hot start test and engine cold start test on the engine when the self-learning of the lift debugging is successful;
the judging module is used for judging whether the self-learning of the lift debugging, the self-learning of the engine hot test, the self-learning of the engine hot start test and the self-learning of the engine cold start test are successful or not;
and the detection module is used for testing whether the continuous variable valve lift mechanism has a fault or not and replacing a fault part when any one of self-learning of the lift debugging fails or self-learning of an engine hot test, self-learning of an engine hot start test and self-learning of an engine cold start test fails.
6. The detection system of the continuous variable valve lift mechanism of claim 5, wherein the detection module is configured to:
testing whether a motor and an electric control component of the continuous variable valve lift mechanism have faults or not;
if yes, the corresponding fault piece is replaced.
7. The detection system of the continuous variable valve lift mechanism according to claim 5 or 6, characterized in that the detection module is further configured to measure a torque of the continuous variable valve lift mechanism under a heat engine when the continuous variable valve lift mechanism has a fault; and analyzing the fault reason according to the comparison result of the torque under the heat engine of the continuous variable valve lift mechanism and the first standard value.
8. The detection system of the continuous variable valve lift mechanism according to claim 5 or 6, wherein the detection module is further used for measuring the cold torque of the continuous variable valve lift mechanism; and analyzing the fault reason according to the comparison result of the torque under the cold machine of the continuous variable valve lift mechanism and the second standard value.
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| CN113236403B (en) * | 2021-04-13 | 2022-03-11 | 联合汽车电子有限公司 | Gas mixture deviation self-learning method and system and readable storage medium |
| CN113983899B (en) * | 2021-11-22 | 2024-03-19 | 中国第一汽车股份有限公司 | Method for testing variable valve lift mechanism |
| CN116428070B (en) * | 2023-03-28 | 2024-09-03 | 长城汽车股份有限公司 | Variable valve timing mechanism fault abnormality processing method, system and vehicle |
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