RU2531704C2 - Method of fuel supply control and fuel supply control unit - Google Patents

Abstract

FIELD: motors and pumps.

SUBSTANCE: method of fuel supply control is proposed, which consists in that the fuel pressure is formed using the high pressure fuel pump, the fuel is supplied to the high-pressure hydraulic accumulator, and a certain pressure level is established therein using the high-pressure control valve, the fuel is supplied to each injector at the pressure set for all injectors from common high pressure hydraulic accumulator, the fuel is supplied under the needle and to the camera above the needle, during injection the fuel from the camera above the needle is sent for draining through the duct, which is opened by the injector control valve with piezoelectric drive, due to the difference of pressures above and below the needle the needle lifted and fuel is injected, the control valve is closed, the fuel is supplied under high pressure to the camera above a needle, the needle is shifted to the seat due to high-pressure, effecting the needle from above. Using the proposed method it is possible to perform at least one preliminary injection, at least one main injection and at least one injection after the main one. Besides the device for implementation of the fuel supply control method is offered.

EFFECT: improvement of precision of dosing of amount of injected fuel and optimization of the fuel combustion process.

2 cl, 3 dwg

Description

The invention relates to methods for controlling the supply of fuel and to devices for controlling the supply of fuel for internal combustion engines-diesels (hereinafter ICE) in stationary installations with diesel engines of high power and mobile transport, on tractors with any type of transmission, in particular with electric transmission, for implementing a wide spectrum of technologies in agriculture, for road-building machines and technologies implemented with their help, in automobile and railway and water transport, armored vehicles and engineering equipment tires.

The prior art (patent DE 102007000072 A1 of 08/30/2007) discloses a method for controlling fuel supply in a Common Rail system. This method consists in creating fuel pressure separately, independently of injection, using a separate high-pressure fuel pump (TNVD), supplying fuel to a high-pressure hydraulic accumulator (HAVD), setting a certain pressure level in it, supplying fuel under the setting for all injectors pressure to the nozzles from the general GAVD, fuel is injected by controlling a valve with a piezo actuator, for this purpose a control valve is opened, fuel is supplied under the needle, and fuel above the needle is directed to drain through the channel opened by the valve, due to the pressure difference above and below the needle, the needle is raised and fuel is injected, the valve is closed with a piezo drive, high-pressure fuel is supplied to the chamber above the needle and under the needle, and the needle is moved to the saddle both due to the spring and due to the high pressure supplied to the needle from above, the pressure in the high pressure washer is changed by controlling the high pressure control valve (HVAC).

The disadvantage of this method is that the pressure created by the GAVD is the same for all injections.

With the help of the GAVD, it is possible to regulate the pressure at its outlet using the high-pressure pump.

This allows you to reduce the dependence of the generated pressure on the rotational speed of the crankshaft and increase the efficiency of the engine in partial modes.

At the same time, certain difficulties arise when dosing ultra-low doses during the implementation of preliminary injections (PV) and injections after the main (VPO). Dosing is carried out only by adjusting the duration of the injections, as the main injection (S), so PV and VPO. In this case, the dosing accuracy decreases even when the valves are controlled by piezo actuators, since at high pressure the air inlet must be given a signal to turn it off immediately after switching on the control valve. Therefore, for some time the transition process is not controlled, the accuracy of the injection is not guaranteed.

Dosing accuracy is also reduced due to the wave processes that are available in the CR system. There are problems in the implementation of the optimal form of OM for the implementation of specific criteria, for example, maximizing the developed capacity or minimizing harmful emissions. In each of these cases, it is necessary to realize OM of a certain form. Known methods of controlling the fuel supply do not give such an opportunity.

It is known from the prior art (patent DE 102007000072 A1 of 30.08.2007) a Common Rail type fuel supply control device comprising a high pressure source in the form of a high pressure fuel pump (TNVD), a high pressure hydraulic accumulator (HPA), hydraulically connected, a high pressure control valve pressure (KRVD), a spring-loaded needle, a control valve, a piezo actuator of a control valve, an electronic control unit (ECU), sensors.

Fuel is drained through the annular chamber, atmospheric pressure is established in the chamber above the needle. High pressure is applied under the needle. Due to the pressure difference above the needle and under the needle, the spring is compressed and the needle rises, fuel is injected. At the same time, the PWM controllers that are used in the high-pressure turbojet for high-pressure turbochargers do not allow controlling the pressure for each individual injection for two reasons.

They can not quickly rebuild during a single injection while supplying fuel. They have limited speed. Several nozzles are fed from the GAVD at once, each of which implements multi-injection. Therefore, it is not possible to control each individual injection of each individual nozzle.

The second disadvantage of the device is that the device does not allow you to adjust the pressure of each individual injection in each individual nozzle. Therefore, the device’s ability to dispense ultra-small volumes is limited. In addition, it is necessary to supply ultra-small volumes under a smaller volume in terms of optimal fuel combustion.

In addition, it is not possible to set the required pressure law for the OB, but there is a need for this.

The aim of the invention is the individual control of the pressure of each injection, more accurate dosing of ultra-small volumes of fuel during injections, as well as setting the required law of pressure and injected volume of fuel for the main injection

This goal is achieved by the fact that in the method of controlling the fuel supply, namely, that they create fuel pressure separately, independently of injection using a separate high-pressure fuel pump, supply fuel to a hydraulic high-pressure accumulator, set a certain pressure level in it using a high-pressure control valve pressure common to the hydraulic accumulator, supply fuel to each injector under the pressure set for all nozzles from the total hydraulic accumulator and at high pressure, fuel is supplied under the needle and the chamber above the needle, fuel from the chamber above the needle is directed to the drain through the channel, which is opened by the control valve of the nozzle with a piezo drive during injection, due to the pressure difference above and under the needle, the needle is raised and fuel injection is closed the control valve, feeds the fuel under high pressure into the chamber above the needle and under the needle, move the needle to the seat both due to the spring, and due to the high pressure supplied to the needle from above, according to the invention, they are carried out as at least one pre-injection, one main injection with the required injection form according to the operating conditions, at least one injection after the main, while controlling the movement of the needle during injection and shut-off, and regulating the duration of each injection by the first control valve with an electromagnetic actuator or piezo actuator, individual pressure level, supplied to each individual nozzle before each subsequent injection, set independently of the control of the movement of the needle during the previous cut-off or during the flow of each of the injections with the help of a second individual pressure regulating valve for each nozzle with a piezo actuator installed between the annular groove of the high pressure for the nozzle needle to which the high pressure fuel is supplied and the drain or hydraulic low pressure accumulator, when preliminary injection is carried out at a constant hydraulic pressure high pressure accumulators change the pressure from maximum with a large cut-off between the last injection after the main and pre-injection of the subsequent cycle at the end of this cut-off or at the beginning of the first preliminary injection to the required value during preliminary injection, the subsequent after the first preliminary injection is carried out at the same pressure or it is changed during the cut-off after the first preliminary injection, when the main injection is implemented at a constant pressure of the hydraulic accumulator high pressure increase the pressure from the previous one at the last preliminary injection to the maximum when implementing a single-stage main injection to implement the maximum power mode at the beginning of the cut-off after the last preliminary injection and single-stage main injection, or set the required pressure at the end of the last cut-off after the second or last preliminary injection and at the beginning of the main injection when realizing the main injection with a given two-stage or multi-stage form at constant pressure hydraulic accumulator of high pressure, which is changed during the main injection to the maximum at the end the main injection using the second independent piezoelectric actuator when implementing the eco-friendly mode for the main injection, when implementing the main injection for the economical mode, the two-stage or multi-stage main injection is carried out at constant pressure of the high-pressure hydraulic accumulator both in its first half with a step increase in pressure to the maximum and in the second half carry out a two-stage or multi-stage injection from maximum pressure to minimum at the end of it with using the second independent piezoelectric actuator, the pressure for injection of the first after the main injection at constant pressure of the high pressure hydraulic accumulator using the second independent piezoelectric actuator is set to maximum at the beginning of injection after the main, the second injection after the main is carried out with the same pressure or change it during cut-off after the first injection after the main injection using a second independent piezo drive, after the second injection after the main during a large cut-off between cycles and fuel supply at the beginning of a large cut-off between fuel supply cycles, the maximum fuel pressure is set before the start of a new injection fuel supply cycle using a second independent piezoelectric actuator; during each cut-off, high-pressure fuel is supplied to the annular chamber under the nozzle needle, hydraulically isolated from the annular groove for the needle .

This goal is achieved in that the fuel supply control device including a high pressure fuel pump, a high pressure hydraulic accumulator, hydraulically connected, a high pressure control valve for a high pressure hydraulic accumulator, a spring-loaded needle, a control valve, an electronic control unit, sensors, according to the claimed invention is equipped with for each nozzle an individual high-pressure control valve with a piezo actuator with a smooth or step change in pressure installed between the annular groove for the nozzle needle at the nozzle exit and the drain or low-pressure hydraulic accumulator and connected to the limited-volume annular groove in the nozzle at its outlet, to which the high-pressure fuel is supplied at the inlet, the output of the low-pressure hydraulic accumulator is connected through the control valve pressure or check valve with the inlet of the high-pressure fuel pump, an annular chamber above the annular groove, hydraulically insulated, is made under the needle from it and connected to a high pressure source.

A new fuel management principle is proposed. It complements and develops the well-known fuel supply principle implemented by the CR system.

The new control principle is that each injection in a multi-injection for each individual nozzle is realized at an individual pressure, which is set using an independent ICRP, which is connected to the analog of a smaller GAVD in the form of an annular groove integrated into the nozzle.

Moreover, each main injection can be set in various modifications: for example, an injection with a constant maximum pressure to realize maximum power or an injection with increasing stepwise or smoothly pressure to realize an injection with a minimum emission of harmful substances.

There is an operational opportunity to switch from one form of injection to another, to quickly rebuild it in the process of changing the profile of the road, other operating conditions of the diesel engine.

The possibility of optimal burning of the main portion of fuel increases. Individual control of each injection in each nozzle allows you to solve the problem of accurate dosing of small volumes, which is also important for creating environmentally friendly and low-noise diesel engines.

A device that implements the method is presented in figure 1-figure 3.

Figure 1 shows a spring-loaded nozzle with a two-position valve (DNA) for the implementation of preliminary injections (PV), injections after the main (VPO) and for the implementation of the main injection (OB);

figure 2 shows a fuel supply system with a common hydraulic accumulator for all injectors and an individual high pressure control valve (IKRVD) of fuel for each injection of each individual injector;

figure 3 shows an individual high pressure control valve with a piezo actuator for individual control of each individual injection in each individual nozzle.

The device of figure 1 consists of a nozzle 1, holes for injection 2 of fuel, needle 3 of the nozzle; an annular groove 4 for supplying high-pressure fuel, connected on one side at the inlet to the high-pressure air heater (not shown in Fig. 1), and on the other hand at the outlet with the high pressure fuel pump (not shown in Fig. 1); an annular chamber 5 connected by a pipeline to the HAV and located above the annular groove 4, while the annular chamber 5 is not hydraulically connected to it; springs 6 for needle 3; needle chamber 7, in which the spring 6 is located; a two-position valve (WPC - not shown in Fig. 1) with an unloading valve 8 (PK 8) connected to a drain and a filling valve 9 (NK 9) connected to a channel for supplying fuel from the GAVD; a channel 10 connecting the needle chamber 7 and the DNA chamber and through it a channel for supplying high-pressure fuel to the needle chamber 7 from the GAVD during fuel cut-offs and for draining fuel through RK 9 during injections; a spring 11 interacting with an anchor mechanically connected to the KDP; a first electromagnetic drive 12 for DNA;

the device in figure 2 consists of a tank for fuel 13, a fuel priming pump 14 (TPN 14) connected to the tank and pipe 15 at the outlet of the TPN 14 with a high pressure fuel pump 16 (high-pressure fuel pump 16); high pressure accumulator 17 (GAVD 17) with a pressure sensor and a high pressure control valve 19 (KRVD 19) of fuel common to all nozzles; low pressure accumulator 20 (GAND 20); a second individual high pressure regulating valve 21 for each nozzle with a piezo actuator (IKRVD 21); the pipeline 22, which connects the GAVD 17 with the nozzles 1 with their playing room directly and playing cameras through the KDP; a pipe 23 that connects the annular groove of the chamber 4 under the needle 3 with ICRP 21 for each nozzle; a pipeline 24, which connects each ICRPV 21 with GAND 20 when the fuel is removed from the ICRP 21, which does not enter the nozzle 1 during injection; pipeline 25, which is connected to RK 8 and GAND 20 and is designed to divert fuel from the needle chamber 7 of the nozzle 1 during injection; a pipeline 26 that connects the GAND 20 and the GAVD 17; a pressure control valve 27 (KRD 27), which is connected by a pipe 28 to the inlet of the high pressure fuel pump 16, the output of which is connected to the inlet of the GAVD 17 by a pipe 29;

the device in figure 3 consists of a housing 30 for ICRP 21, a hydraulic valve 31, spring-loaded 32 and connected to the piezoelectric actuator 33 through a movement multiplier 34 (MP 34); an electronic control unit 35 (ECU 35) connected to the piezo actuator 33.

The operation of the device that implements the method.

Fuel under high pressure comes from the high-pressure fuel pump 16 (figure 2) to the HAD 17 through a pipe 29 through a pressure sensor 18.

The total constant pressure for all nozzles in the GAVD 17 is set using the first high-pressure pump 19 by means of PWM pulses. The advantage of the CR system with GAVD 17 is the ability to maintain a constant pressure in the GAVD 17 over a wide range of crankshaft speeds using KRVD 19 with a PWM controller. However, KVVD 19 does not allow you to control the fuel pressure for a separate injection and for any nozzle. Therefore, all injections of each fuel supply cycle in one nozzle and all injections in all nozzles are carried out with the same pressure set by the fuel pump engine 19.

Fuel under pressure enters from the GAVD 17 through the pipe 22 (Fig. 2) and the high-pressure fuel supply channel of the nozzle 1 (the supply channel in Fig. 1 is not indicated) to the nozzle chamber 7 of the nozzle 1 through the LC 9 during shut-off.

During the implementation of the supply voltage, voltage is supplied from the ECU 35 to the electromagnetic drive 12. An anchor connected rigidly to the DPK rises, opens RC 8 and closes NC 9, connects the needle chamber 7 through RC 8 with a drain or GAND 20 through pipeline 25 (Fig. 2 )

The movements of the needle 1 and the control of the duration of the injections are controlled independently of the pressure control by means of an electric drive 12 through an anchor connected to the WPC.

The pressure of the fuel supplied under the needle 3 into the openings 2 of the nozzle 1 is set during each cut-off for subsequent injection using the ICRP 21 in order to achieve a certain value at the time of each injection. The subsequent set pressure for subsequent injections may be greater than the previous one or less. We consider these cases specifically.

Before the implementation of the PV during a large cut-off between cycles, the valve IRRVD 21 is closed. The pressure that is supplied under the needle 3, the maximum. This is necessary to reduce fuel loss for management.

To implement the first PV, it needs to be lowered to optimize the combustion process.

To implement the PV with the ECU 35, a certain voltage is supplied to the ICRP 21 located in the housing 30 (Fig. 3). The voltage supplied to the piezoelectric actuator can vary smoothly or stepwise.

This voltage is applied at the end of the large cutoff - the beginning of the air supply - to compensate for the pressure drop at the beginning of the air supply. The piezoelectric actuator 33 creates pressure and movement, which through the MP 34 is transmitted to the hydraulically unloaded valve 31. The valve 31 moves to the left, compresses the spring 32.

The pressure supplied under the needle 3, is reduced below the maximum to the required for PV as follows. In the annular chamber 4 of the nozzle, constant high pressure fuel is supplied from the high pressure washer 17. At low pressures from the high pressure washer 17, fuel is supplied to the annular chamber 5 at maximum pressure. This annular chamber is not hydraulically connected to the annular groove 4, in which the fuel pressure required for any injection is generated. Therefore, the pressure in the annular chamber 5 creates additional lifting force for the needle 3, which is important when realizing PV and VPO, which are realized at reduced pressures.

Moreover, from the annular groove 4, which is located below the annular chamber 5 of the nozzle 1, through the pipe 23 through the valve 31 ICRP 21 part of the fuel enters the pipe 24 and GAND 20.

The annular groove 4, to which high pressure is supplied from the GAVD 17 and from which the fuel is removed to the GAND through pipelines 23 and 24 through the ICRP 21, plays the role of a controlled individual GAVD. The pressure in the annular chamber 4 is reduced to the level required for the PV. The fundamental difference is that the annular chamber 4 does not play a role common to all nozzles of the HAVD, but an individual HJV and is controlled by ICRP 21.

The presence of an annular chamber 4, used as an IGAVD, allows for the implementation of a new control principle - the principle of individual pressure control of each individual injection, namely: PV, OV and VPO pressure in each optimal fuel supply cycle. At the same time, the annular chamber 5, into which the fuel is supplied under high pressure, helps to realize high dynamic qualities for the needle 3. This is especially true for the implementation of PV and VPO, the duration of which is small and requires a quick rise of the needle during the injection.

When forming a predetermined pressure during air supply using ICRP 21, it is necessary to maintain a constant pressure from the GAVD 17. Therefore, simultaneously with the opening of the ICRP 21, which leads to a drop in pressure of the GAVD 17, it is necessary to reduce the flow cross section of the HPC 19. But this is problematic. Because the PWM pulses for the high-pressure fuel pump 19 are an order of magnitude longer in duration of the control pulses for the high pressure fuel pump 21. The different speed of the high-pressure fan 19 and the high pressure fuel pump 21 dictate a different strategy: a strategy for increasing the volume of the high pressure fuel pump 17.

Therefore, it is possible to take both the high-pressure air duct 17 of a larger volume and the high-pressure fuel pump 16 of greater power and productivity. Because when managing the form of OM, an inevitable increase in management costs is inevitable.

The role of igavd can perform the external final volume, connected in series with the annular groove 4.

From GANDA 20, fuel is supplied through the KRD 27 and pipeline 28 to the drain or to the high-pressure fuel pump 16.

The valve KRD 27 sets the lower limit of the fuel pressure in the fuel supply system, which can be regulated. This limit can be set and unregulated by means of a check valve. The check valve instead of KRD 27 in figure 2 is not shown. Another part of the fuel enters with the desired pressure required for the PV from the annular groove 4 to the nozzle 1.

The magnitude of this pressure depends on the magnitude of the movement of the valve 31 to the left (figure 3). For PV, a pressure value is selected by moving the valve 31 such that the spring 6 is compressed, and the needle 3 moves upward by a certain amount.

In this case, the pressure should provide the necessary accuracy of dosing, as well as to ensure optimal combustion of the first portion of fuel, a lower combustion temperature and a reduction in the noise level of a diesel engine.

The spring 6 is compressed, the fuel through the channel 10 and the open RK 8 goes to the drain, and the NK 9 is closed. The fuel enters the holes 2 of the nozzle atomizer 1 at a predetermined pressure. The duration of the PV is determined by the on time of the electromagnetic valve 12.

At the time of the end of the supply voltage to the electromagnetic drive 12 with the ECU 35 voltage is not applied. The spring 11, compressed during airflow, is unclenched, NK 9 opens, RK 8 closes.

Through NK 9 and channel 10, high pressure enters the needle chamber 7 and presses on the needle 3 together with the spring 6. The needle 3 quickly sits on the saddle and the ST stops.

After the end of the supply circuit with the ECU 35, a lower voltage value or a minimum voltage value is supplied to the piezoelectric actuator 33 than during injection.

The valve 31 is subject to less force and less movement from the side of the piezoelectric actuator 32. Therefore, the valve 31 is moved a large amount to the right by the force of the spring 32 (Fig. 3).

Its passage section decreases, the pressure of the fuel supplied under the needle 3 and into the annular groove 4 becomes greater than it was during the PV, up to the maximum.

This is done during the cut-off immediately after the PV in order to increase the pressure in front of the exhaust gas in the form of a single-stage injection in order to save fuel for control, because the pressure that is supplied to the nozzle increases, the proportion of fuel supplied through the ICRP 31 to the GAND 20 decreases.

A single-stage exhaust gas, for example, allows you to realize the maximum pressure during the entire exhaust gas and to implement the law of maximum ICE power. Two-stage injection allows you to implement other laws OB. For example, a law under which there will be minimal emission of harmful exhaust components. With a two-stage injection or injection of a different shape in pressure, the initial OB pressure can be less than the final pressure of the first or second PV.

Therefore, in the implementation of the exhaust gas with multi-stage fuel supply, the first stage occurs, as in the case of airflow and high-pressure equipment, only at any initial pressure. Fuel under pressure is supplied from the HAVD 17 through the pipe 22 and the nozzle channel 1 for supplying high pressure (Fig. 1, Fig. 2) to the needle ring chamber 5 and the annular groove 4 and needle ring 7 of the nozzle chamber 1. The pressure of the fuel supplied under the needle 3 in the holes 2 of the sprayer is set using IKRVD 21 during cut-off after the first or second PV, depending on the number of PV, and before OV.

To implement the first step of the OB with ECU 35, voltage is supplied from ECU 35 to the electromagnetic drive 12. An anchor connected rigidly to the DPK rises, opens RC 8 and closes NC 9, connects needle box 7 through pipeline 8 through RC 8 (Fig. 1- figure 3) with GAND 20.

For OB, a pressure value is selected by moving the valve 31 so as to realize the required law of pressure during injection. It can be greater or less than the PV pressure, but only at the very beginning of the OM, and then it grows to the maximum due to pressure control by at least two steps.

At this pressure, the spring 6 is compressed, and the needle 3 moves upward by a large amount at the end of the injection, because at the end of the OB the fuel is always supplied at maximum pressure. This makes it possible to inject a larger portion of fuel at the first step of a two-stage exhaust agent at higher pressure. The spring 6 is compressed, the fuel through the channel 10 and through the open RK 8 goes to the drain or to the GAND 20 with the closed NK 9.

The fuel enters the holes 2 of the nozzle nozzle 1 at a pressure set during cut-off that is higher than with PV.

To implement the first step of the OB with an ECU 35, a certain voltage value is supplied to the ICRP 21, lower than for the PV and VPO (Fig. 3). The voltage supplied ICRVD 21, can vary smoothly or stepwise. The piezoelectric actuator 33 creates less pressure and movement together with the MP 34, which is transmitted through the MP 34 to the hydraulically unloaded valve 31. The valve 31 moves to the right, under the influence of the spring 32.

High pressure fuel is supplied to the annular chamber 5 of the nozzle from the GAVD 17 to improve the dynamics of raising the needle 3. At the same time, from the annular groove 4 of the nozzle 1 through the pipe 23 through the valve 31, part of the fuel enters the pipe 24 and to the GAND 20.

An annular groove 4, to which high pressure is supplied from the GAVD 17 and from which the fuel is removed to the GAND 20 through pipelines 23 and 24 through the ICRP 21, plays the role of a controlled GAVD. The fundamental difference is that the annular groove 4 plays a role that is not common for all nozzles of the high pressure washer, plays the role of an individual high pressure, controlled by ICRP 31.

The presence of an annular groove 4, used as a GAVD, allows for the implementation of a new control principle.

From GANDA 20, fuel is supplied through the KRD 27 and through the pipe 28 to the drain or to the high-pressure fuel pump 16. The valve KRD 27 sets the lower limit of the fuel pressure in the fuel supply system, which can be regulated. This limit can be set and unregulated by means of a check valve. The check valve instead of KRD 27 in figure 2 is not shown.

Another part of the fuel flows under pressure into the nozzle 1. Fuel from the annular groove 4 of the nozzle 1 during injection enters through the channel of the nozzle 1 to divert the fuel through the pipe 25 to the GAND 20.

The magnitude of this pressure depends on the amount of movement of the valve 31 to the right. For the first OB stage, the required initial pressure value is selected by moving the valve 31. Fuel enters the holes 2 of the nozzle atomizer 1 under the pressure set for the first OB stage.

After the end of the first OB stage, during the flow of the OB with the ECU 35, the minimum voltage is supplied to the piezoelectric actuator 33 with the MP 34.

The valve 31 moves to the right under the action of the spring 32 to the maximum value to the right and closes the completely bore section of the valve 31. Its bore section decreases to zero, the pressure of the fuel supplied under the needle 3 increases to the maximum.

High pressure fuel is supplied to the annular groove 4 of the nozzle from the GAVD 17. In this case, from the annular groove 4 of the nozzle 1 through the pipe 23 through the valve 31, part of the fuel does not enter the pipeline 24 and the GAND 20. The second part of the two-stage injection passes at the maximum pressure that develops GAVD 17. At least in the second half of OV. Similarly, by controlling the ICRP 21, multi-stage injection is performed.

At maximum pressure, the spring 6 is compressed to the maximum possible value and the needle 3 rises to the maximum possible value. Correctly selected initial pressures of the first OB stage, the correctly selected time for switching the ICRD 21 to the maximum pressure provide optimal transients of pressure change in time for the SBS or changes in the amount of injected fuel for SBS in time, realize the desired S.

The volume of injected fuel is also maximum during the implementation of the second stage of the OM. During a two-stage or multi-stage injection, a constant voltage is applied to the electromagnetic drive 12. A two-stage injection or another form of injection is realized due to independent pressure control using IKRVD 21 at constant pressure of the high pressure hydraulic accumulator. Due to the fact that to change the shape of the OM for various modes, it is necessary to change the pressure during the OM, the fuel consumption for control increases. The reason is that the flow rate of fuel passing through the valve 31 ICRF 21 when setting the appropriate pressure, in addition to the fuel that passes through the HPLC 19, increases. For the effective implementation of the TPS, which implements the new control principle, it is necessary to choose a larger volume of GAVD 17 and high-pressure fuel pump 16 of greater productivity .

The springs 11 and 6 are compressed, the needle is first in an intermediate position for the first injection step, and then in the upper end position for the second injection step. To implement a two-stage injection, a spring 6 of two parts with greater and lesser stiffness can be selected (such a spring is not shown in Fig. 1).

If a single-stage OV is implemented to implement the maximum ICE power mode, then when the OV is implemented with ECU 35, the minimum voltage is applied to the piezoelectric actuator 33 with MP 34 at the beginning of the cut-off after the last PV. The valve 31 moves under the action of the spring 32 to the maximum value to the right and closes the completely bore section of the valve 31. High pressure fuel is supplied to the annular groove 4 of the nozzle from the GAVD 17. At the same time, no fuel flows from the annular groove 4 of the nozzle 1 through the pipe 23 through the valve 31 pipeline 24 and GAND 20.

Its through section decreases to zero, the pressure of the fuel supplied under the needle 3 increases to the maximum, as during the second step of the OB. And this pressure is set for the entire time of the exhaust air with the IRRT 21 completely closed. When shutting off the ECU 35, the voltage to the electromagnetic valve 12 is not applied. The spring 11 moves the armature and the mechanical on-off valve connected to it down. The NK 9 opens and the RK 8 closes. Under the influence of high-pressure fuel and a spring 6, the needle 3 quickly becomes on the saddle. The fuel is cut off and the exhaust agent ends.

ICRVD 31 thus opens at the beginning of the cut-off after the OB. The maximum positive voltage is supplied to the IKRVD 21 with the ECU 35. The piezodrive 33 through the MP 34 creates pressure and movement of the valve 31. The latter moves to the left (Fig. 3), compresses the spring 32. The bore of the valve 31 increases to the maximum. The pressure in the annular groove 4 drops to a minimum. This allows you to quickly and reliably put the needle 3 on the saddle during the cut-off after OB.

The OV can be realized in multi-stage not only at the beginning, but also at the end by creating the corresponding pressure in each step using the ICRP 21. In the same way as when the pressure rises from the step to the step at the beginning of the OV to the maximum due to pressure control using IKRVD 21, at the end of the OV the pressure also changes stepwise, but from maximum to minimum.

As a result, an injection can be realized that is close to trapezoidal in shape, corresponding to an economical fuel supply mode, or an environmentally friendly injection with a sharp decrease in pressure at the end of the blower, as with a single-stage injection.

The first VPO is realized at maximum pressure at a constant pressure of the HPA 17. Therefore, the flow area of valve 31 remains closed after a single-stage OB, which ends at maximum pressure and the first VPO occurs at maximum pressure. In the annular groove 4 of the nozzle is fed high pressure fuel from the HAVD 17.

Moreover, from the annular groove 4 of the nozzle 1 through the pipe 23 through the valve 31, the fuel does not enter the pipeline 24 and the GAND 20. The pressure in the annular groove 4 is kept maximum for the implementation of the first VPO.

The duration of the first VPO is set by controlling the electromagnetic drive 12, which operates independently of the operation of the ICRP 31.

To do this, during the cut-off after the OB, the electromagnet 12 is supplied with voltage from the ECU 35. The electromagnet 12 moves up the armature along the WPC and compresses the spring 11.

RK 8 opens, NK 9 closes. The needle 3, under the action of maximum pressure, rises upward; it contributes to the fact that the maximum pressure is applied to the annular chamber 5, which is hydraulically isolated from the annular groove 4, which acts on an additional differential platform under the needle 3, creates extra effort. Under the action of pressure under the needle 3, under its second differential platform, the needle 3 quickly moves to the upper position. Through PK8, fuel is drained from chamber 7 through channel 10 and fuel is supplied under the needle 3 from the annular groove 4 connected at the inlet to the GAVD 17. The first VPO takes place. After its completion, the voltage from the ECU 35 is not supplied to the electromagnet 12. The spring 11 is unclenched and moves the anchor with DNA down. NK 9 opens and RK 8 closes.

The needle 3 moves down under the action of the spring 6 and high fuel pressure, which enters the chamber 7 above the needle 3 through the channel 10. There is a cut-off after the first VPO.

After the first VPO, the second VPO is implemented similarly to the implementation of the PV, but with its specified pressure. But this pressure is set at the end of the cutoff after the first VPO or at the very beginning of the second VPO. This is done in order to save fuel on management.

At the end of the cutoff after the first VPO for the implementation of the second VPO with ECU 35, a certain voltage value is supplied to the ICRP 21 located in the housing 30 (Fig. 3)

The piezoelectric actuator 33 generates pressure and movement, which is transmitted through the MP 34 to the hydraulically unloaded valve 31. The valve 31 moves to the left, compresses the spring 32. High pressure fuel is supplied to the annular groove 4 of the nozzle from the GAVD 17.

In this case, from the annular groove 4 of the nozzle 1 through the pipe 23 through the valve 31, part of the fuel enters the pipe 24 and to the GAND 20.

From GANDA 20, fuel is supplied through the KRD 27 and pipeline 28 to a drain or to GANDA 20 and through it to the high-pressure fuel pump 16.

The valve KRD 27 sets the lower limit of the fuel pressure in the fuel supply system, which can be regulated. This limit can be set and unregulated by means of a check valve. The check valve instead of KRD 27 in figure 2 is not shown.

The other part of the fuel comes under maximum pressure from the annular chamber 5 through the annular groove 4 into the holes 2 of the nozzle 1.

The magnitude of this pressure depends on the amount of movement of the valve 31 to the left, on the area of the passage section of the valve 31. This magnitude of the pressure is less than the maximum developed by the GAVD 17.

For the second VPO, a pressure value is selected by moving the valve 31 such that the spring 6 is compressed and the needle 3 moves up. In order for the needle 3 to confidently move upward at lower injection pressures, fuel is supplied under maximum pressure to the annular chamber 5 under the additional differential pad of the needle 3. The spring 6 is compressed, the fuel passes through the channel 10 and open PK 8 to the drain, and the NK 9 is closed . The fuel enters the holes 2 of the nozzle nozzle 1 under the pressure set for the second HPE.

At the time of the end of the second malware on the electromagnetic drive 12 with the ECU 35 voltage is not applied. The spring 11, compressed during injection, is unclenched, the anchor with DNA moves down. NK 9 opens, RK8 closes. Through channel 10, high pressure enters the needle chamber 7 and presses on the needle 3 together with the spring 6. The needle 3 quickly sits on the saddle and the second VPO stops.

A large cut-off lasts until the start of a new fuel supply cycle, which, like all cycles, begins with a PV. At the end of the HPE with the ECU 35, the minimum voltage is supplied to the piezo actuator 33.

The valve 31 moves to the right under the action of the spring 32 to the maximum value to the right and closes the completely bore section of the valve 31.

Its passage section decreases to zero, the pressure of the fuel supplied under the needle 3 from the annular groove 4 to the maximum increases. At the same time, fuel is not supplied to the drain via IKRVD 21 until the start of a new optimal fuel supply cycle.

This allows you to minimize fuel consumption for control from the GAVD 17, since it is closed with a large cut-off between the ICRP 21 cycles and there is no discharge through it.

The proposed device implements all the operations of the method.

Claims (2)

1. The method of controlling the fuel supply, which consists in creating a fuel pressure separately, independently of injection, using a separate high-pressure fuel pump, supplying fuel to a hydraulic high-pressure accumulator, setting a certain pressure level therein using a high-pressure control valve common to hydraulic accumulator, supply fuel to each injector under the pressure set for all nozzles from a common hydraulic high-pressure accumulator, supply fuel under the needle and the chamber above the needle, the fuel from the chamber above the needle is directed to the drain through the channel, which is opened by the control valve of the nozzle with the piezo drive during injection, due to the pressure difference above and below the needle, the needle is raised and fuel is injected, the control valve is closed, fuel is supplied under high by pressure into the chamber above the needle and under the needle, the needle is moved to the saddle both due to the spring, and due to the high pressure applied to the needle from above, characterized in that at least one preliminary injection, one main injection are carried out ck with the injection form required by the operating conditions, at least one injection after the main injection, while controlling the movement of the needle during injection and cut-off and adjusting the duration of each injection with the first control valve with an electromagnetic actuator or piezo drive, an individual level of pressure supplied to each individual nozzle before each subsequent injection, set regardless of the control of movement of the needle during the previous cut-off or during the course of each of the injections using the second individual the piezodrive control valve for each nozzle installed between the high-pressure annular groove for the nozzle needle to which the high-pressure fuel is supplied and the drain or low-pressure hydraulic accumulator, when the preliminary injection is performed at constant pressure, the high-pressure hydraulic accumulator changes the pressure from maximum with a large cutoff between the last injection after the main and preliminary injection of the subsequent cycle at the end of the cut-off or at the beginning of the first preliminary injection to the required one at the preliminary injection, the subsequent after the first preliminary injection is carried out at the same pressure or it is changed during the cut-off after the first preliminary injection, when the main injection is carried out at a constant pressure of the high-pressure hydraulic accumulator, increase the pressure from the previous at the last preliminary injection to the maximum during the implementation of a single-stage main injection for the implementation of the maximum power at the beginning of the cut-off after the last preliminary injection and single-stage main injection, or set the required pressure at the end of the last cut-off after the second or last preliminary injection and at the beginning of the main injection when realizing the main injection with a given two-stage or multi-stage form at a constant pressure of the high-pressure hydraulic accumulator, which change during the main injection to the maximum at the end of the main injection using a second independent drink the drive during the implementation of the environmentally friendly mode during the main injection, when implementing the main injection for the economy mode, a two-stage or multi-stage main injection is carried out at a constant pressure of the high-pressure hydraulic accumulator, both in its first half with a stepwise increase in pressure to the maximum, and in its second half, a two-stage or multi-stage injection from maximum pressure to minimum at the end of it using a second independent piezoelectric actuator, pressure for the injection of the first after the main injection at constant pressure of the hydraulic accumulator of high pressure using the second independent piezoelectric actuator, set the maximum at the beginning of the injection after the main, the second injection after the main is carried out with the same pressure or change it during cut-off after the first injection after the main injection using the second independent piezo drive, after the second injection after the main during the large cutoff between fuel supply cycles at the beginning of the large cutoff between cycles with the fuel supply set the maximum fuel pressure before the start of a new injection fuel supply cycle with the help of a second independent piezoelectric actuator; at each cut-off, the fuel is fed under high pressure into the annular chamber under the nozzle needle, hydraulically isolated from the annular groove for the needle. 2. Fuel control device comprising a high pressure fuel pump, a high pressure hydraulic accumulator connected hydraulically, a high pressure control valve for a high pressure hydraulic accumulator, nozzles with spring-loaded needles and control valves, an electronic control unit, sensors, characterized in that the device is equipped with for each nozzle an individual high-pressure control valve with a piezoelectric actuator with a smooth or stepwise change in voltage, is installed between the annular groove for the nozzle needle at the nozzle exit and the drain or low pressure hydraulic accumulator and connected to the limited volume annular groove in the nozzle at its outlet, to which the high pressure fuel is supplied at the inlet, the output of the low pressure hydraulic accumulator is connected through the pressure control valve or non-return valve with the inlet of the high pressure fuel pump, an annular chamber is made under the needle above the annular groove, hydraulically isolated from it and connected I am a high-pressure source.

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