阅读说明：本技术 发动机大油门扭矩控制方法 (Engine big throttle torque control method ) 是由 秦龙 郑建波 刘莹 赵田芳 于 2021-06-30 设计创作，主要内容包括：本发明公开了一种发动机大油门扭矩控制方法,包括以下步骤：判断油门开度是否超过预设开度,并判断发动机请求扭矩与发动机最大能力扭矩之差是否超过预设扭矩差值；若油门开度超过预设开度且扭矩之差未超过预设扭矩差值,则大油门扭矩请求控制被激活,同时进行节气门动态控制和喷油加浓控制；其中,节气门动态控制时,具体根据节气门入口实际气体压力与出口目标气体压力之差或者出口实际气体压力之差所在范围分段进入节气门全开模式或者非全开模式,控制节气门出口目标气体压力与实际压力之差不超过2kPa,且控制扭矩精度范围不超过±5％；喷油加浓控制时,周期逐步累加,最终喷油加浓系数不超过以发动机转速和负荷确定的最大加浓系数。(The invention discloses a method for controlling torque of a big throttle of an engine, which comprises the following steps: judging whether the opening degree of the accelerator exceeds a preset opening degree or not, and judging whether the difference between the requested torque of the engine and the maximum capacity torque of the engine exceeds a preset torque difference value or not; if the throttle opening exceeds the preset opening and the torque difference does not exceed the preset torque difference, the large throttle torque request control is activated, and throttle dynamic control and oil injection enrichment control are simultaneously carried out; during dynamic control of the throttle valve, the throttle valve is in a full-open mode or a non-full-open mode in a subsection mode according to the range of the difference between the actual gas pressure at the inlet of the throttle valve and the target gas pressure at the outlet of the throttle valve or the difference between the actual gas pressure at the outlet of the throttle valve, the difference between the target gas pressure at the outlet of the throttle valve and the actual pressure is controlled not to exceed 2kPa, and the control torque precision range is not to exceed +/-5%; during the fuel injection enrichment control, the periods are gradually accumulated, and finally the fuel injection enrichment factor does not exceed the maximum enrichment factor determined by the rotating speed and the load of the engine.)

1. An engine heavy throttle torque control method is characterized by comprising the following steps:

judging whether the opening degree of the accelerator exceeds a preset opening degree or not, and judging whether the difference between the requested torque of the engine and the maximum capacity torque of the engine exceeds a preset torque difference value or not;

if the throttle opening exceeds the preset opening and the torque difference does not exceed the preset torque difference, the large throttle torque request control is activated, and throttle dynamic control and oil injection enrichment control are simultaneously carried out;

during dynamic control of the throttle valve, the throttle valve is in a full-open mode or a non-full-open mode in a subsection mode according to the range of the difference between the actual gas pressure at the inlet of the throttle valve and the target gas pressure at the outlet of the throttle valve or the difference between the actual gas pressure at the outlet of the throttle valve, the difference between the target gas pressure at the outlet of the throttle valve and the actual pressure is controlled not to exceed 2kPa, and the control torque precision range is not to exceed +/-5%;

during the fuel injection enrichment control, the current fuel injection enrichment factors are gradually accumulated in a certain period, and the final fuel injection enrichment factor does not exceed the maximum enrichment factor determined by the engine speed and the load.

2. The engine throttle torque control method according to claim 1, wherein during the throttle valve dynamic control, the control is performed in a segmented manner:

judging whether the difference between the actual gas pressure at the inlet of the throttle valve and the target gas pressure at the outlet of the throttle valve exceeds a first preset pressure A or not, and if so, entering a non-full-open mode by the throttle valve;

if not, continuously judging whether the difference between the actual gas pressure at the inlet and the actual gas pressure at the outlet of the throttle valve is smaller than a second preset pressure B, if so, entering a full-open mode by the throttle valve;

if not, continuously judging whether the difference between the actual gas pressure at the inlet of the throttle valve and the target inlet gas pressure at the outlet of the throttle valve is smaller than a third preset pressure C, if so, entering a full-open mode by the throttle valve;

if not, continuously judging whether the difference between the actual gas pressure at the inlet of the throttle valve and the actual gas inlet pressure at the outlet of the throttle valve is larger than a fourth preset pressure D, if so, entering a non-full-open mode by the throttle valve;

the first preset pressure A is greater than a third preset pressure C, the second preset pressure B is greater than a fourth preset pressure D, the first preset pressure A is smaller than a first pressure threshold A 'under the condition that the large throttle torque request is not activated, the second preset pressure B is greater than a second pressure threshold B' under the condition that the large throttle torque request is not activated, the third preset pressure C is greater than a third pressure threshold C 'under the condition that the large throttle torque request is not activated, and the fourth preset pressure D is smaller than a fourth pressure threshold D' under the condition that the large throttle torque request is not activated.

3. The engine throttle torque control method according to claim 2, characterized in that the first pressure threshold value a 'is greater than the third pressure threshold value C' and the second pressure threshold value B 'is greater than the fourth pressure threshold value D'.

4. The engine throttle up torque control method of claim 1, wherein in the non-wide-open mode, the torque accuracy is adjusted by fuel injection enrichment by adjusting an absolute value of a rate of change of the throttle effective area within a certain range.

5. The engine throttle up torque control method according to claim 1, wherein both the rate of change of controlling the increase and the rate of change of controlling the decrease of the throttle effective area are within respective ranges in the wide open throttle mode.

6. The engine wide-throttle torque control method according to claim 1, characterized in that when the injection enrichment condition of the wide-throttle torque control is not satisfied, the engine wide-throttle torque control method gradually exits to a state where the wide-throttle torque injection enrichment is not performed.

7. The engine wide-throttle torque control method according to claim 6, characterized in that, gradually exiting to a state where the wide-throttle torque injection enrichment is not performed, the enrichment factor is reduced by 0.02 every 10ms, and the enrichment factor is used as a multiplication factor for the injection quantity compensation.

8. The engine throttle torque control method according to claim 1, characterized in that the special operating condition of the engine is rejected in advance when the heavy load injection enrichment is performed.

9. The engine megathrottle torque control method of claim 8, wherein the heavy load enrichment request is prioritized over other injection enrichment/enleanment requests, and is lower than injection enrichment, knock enrichment, and exhaust temperature protection enrichment requests during engine start.

10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the engine throttle torque control method according to any one of claims 1-9.

Technical Field

The invention relates to the field of engine control, in particular to a method for controlling the torque of a big throttle of an engine.

Background

At present, an electric control gasoline engine is generally controlled based on a torque model, and the control dimensionality of the engine comprises dynamic property, economy, emission, NVH, drivability and the like. The dynamic output of the engine not only ensures the external characteristic torque capacity of the engine, but also ensures the torque output under a large throttle of the whole vehicle. The torque output ensures both the torque response rate and the torque response accuracy.

In the prior art, calculation of the maximum torque capacity of the gasoline engine is proposed, but how to ensure accurate control of the maximum torque is not proposed according to the maximum torque under different working conditions.

Disclosure of Invention

The invention mainly aims to provide a control method for the torque of a big throttle of an engine, which can improve the service life of parts of the engine and optimize the dynamic property, the vehicle stability and the driver comfort of the engine.

The technical scheme adopted by the invention is as follows:

the method for controlling the torque of the big throttle of the engine comprises the following steps:

judging whether the opening degree of the accelerator exceeds a preset opening degree or not, and judging whether the difference between the requested torque of the engine and the maximum capacity torque of the engine exceeds a preset torque difference value or not;

if the throttle opening exceeds the preset opening and the torque difference does not exceed the preset torque difference, the large throttle torque request control is activated, and throttle dynamic control and oil injection enrichment control are simultaneously carried out;

during dynamic control of the throttle valve, the throttle valve is in a full-open mode or a non-full-open mode in a subsection mode according to the range of the difference between the actual gas pressure at the inlet of the throttle valve and the target gas pressure at the outlet of the throttle valve or the difference between the actual gas pressure at the outlet of the throttle valve, the difference between the target gas pressure at the outlet of the throttle valve and the actual pressure is controlled not to exceed 2kPa, and the control torque precision range is not to exceed +/-5%;

during the fuel injection enrichment control, the current fuel injection enrichment factors are gradually accumulated in a certain period, and the final fuel injection enrichment factor does not exceed the maximum enrichment factor determined by the engine speed and the load.

According to the technical scheme, during the dynamic control of the throttle valve, the sectional control is specifically carried out:

judging whether the difference between the actual gas pressure at the inlet of the throttle valve and the target gas pressure at the outlet of the throttle valve exceeds a first preset pressure A or not, and if so, entering a non-full-open mode by the throttle valve;

if not, continuously judging whether the difference between the actual gas pressure at the inlet and the actual gas pressure at the outlet of the throttle valve is smaller than a second preset pressure B, if so, entering a full-open mode by the throttle valve;

if not, continuously judging whether the difference between the actual gas pressure at the inlet of the throttle valve and the target inlet gas pressure at the outlet of the throttle valve is smaller than a third preset pressure C, if so, entering a full-open mode by the throttle valve;

if not, continuously judging whether the difference between the actual gas pressure at the inlet of the throttle valve and the actual gas inlet pressure at the outlet of the throttle valve is larger than a fourth preset pressure D, if so, entering a non-full-open mode by the throttle valve;

the first preset pressure A is greater than a third preset pressure C, the second preset pressure B is greater than a fourth preset pressure D, the first preset pressure A is smaller than a first pressure threshold A 'under the condition that the large throttle torque request is not activated, the second preset pressure B is greater than a second pressure threshold B' under the condition that the large throttle torque request is not activated, the third preset pressure C is greater than a third pressure threshold C 'under the condition that the large throttle torque request is not activated, and the fourth preset pressure D is smaller than a fourth pressure threshold D' under the condition that the large throttle torque request is not activated.

In the above technical solution, the first pressure threshold a 'is greater than the third pressure threshold C', and the second pressure threshold B 'is greater than the fourth pressure threshold D'.

According to the technical scheme, under the non-fully-opened mode, the absolute value of the change rate of the effective area of the throttle valve is adjusted within a certain range, and the torque precision is adjusted through oil injection and enrichment.

According to the technical scheme, when the throttle valve is in the full-open mode, the change rate of the increase and the change rate of the decrease of the effective area of the throttle valve are controlled to be in the corresponding range.

According to the technical scheme, when the oil injection enrichment condition of the large throttle torque control is not met, the large throttle torque control gradually exits to a state without large throttle torque oil injection enrichment.

According to the technical scheme, when the fuel injection amount is gradually withdrawn to the state without large throttle torque fuel injection enrichment, the enrichment factor is reduced by 0.02 every 10ms, and the enrichment factor is used as a multiplication factor for fuel injection amount compensation.

According to the technical scheme, when heavy-load oil injection thickening is carried out, the special working condition of the engine is removed in advance.

According to the technical scheme, the priority of the heavy load enrichment request is higher than that of other oil injection enrichment/lean reduction requests, and is lower than the oil injection enrichment, detonation enrichment requests and exhaust temperature protection enrichment requests in the starting process of the engine.

The present invention also provides a computer readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the engine throttle torque control method according to any one of claims 1 to 9.

The invention has the following beneficial effects: the method enters a throttle full-open mode or a non-full-open mode in a subsection mode according to the range of the difference between the actual gas pressure at the inlet of the throttle and the target gas pressure at the outlet of the throttle or the difference between the actual gas pressure at the outlet of the throttle, controls the difference between the target gas pressure at the outlet of the throttle and the actual pressure not to exceed 2kPa, and controls the torque precision range not to exceed +/-5 percent, thereby improving the torque precision of the engine under the heavy throttle, ensuring the torque control stability and precision under the heavy throttle of the whole vehicle, improving the service life of parts of the engine on the one hand, and optimizing the dynamic property of the engine, the vehicle stability.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a flow chart of a method for controlling engine throttle torque according to an embodiment of the present invention;

FIG. 2 is a flowchart of a segment control method in throttle dynamic control according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The great throttle torque control of the engine has the important significance that the torque accuracy and the response capability of the engine under the zero pedal opening degree and different throttle opening degrees are not only considered in the power output of the engine, but also the torque accuracy under the great throttle determines the maximum capability and the control accuracy of the engine. Based on the torque control method, the torque precision is realized by optimizing the effects of throttle control and fuel injection enrichment, the ignition control under the large throttle torque request is not particularly optimized, and the optimal ignition angle control under the current working condition under normal control is kept.

It should be noted that the following concepts are introduced into the control:

actual throttle inlet gas pressure: real-time gas pressure at the inlet of the finger throttle;

actual gas pressure at the throttle outlet: real-time gas pressure at the outlet of the finger throttle;

throttle outlet target gas pressure: the target gas pressure at the outlet of the throttle valve is indicated. The target gas pressure is derived based on an engine operator torque request to meet engine dynamics requirements. In the throttle responsiveness control process, it is necessary to control the actual gas pressure at the throttle outlet to follow the target gas pressure.

The optimized throttle valve control means optimizing the change in the dynamic control process of the throttle valve under the large throttle valve torque request so as to ensure the accuracy of torque response; meanwhile, when the large throttle torque is requested, under the premise of ensuring the exhaust temperature, the fuel injection enrichment (namely, the fuel-air mixture is appropriately enriched compared with the fuel-air mixture under the normal optimal air-fuel ratio) is carried out, and the torque can be further increased.

The method for controlling the torque of the big throttle of the engine in the embodiment of the invention is mainly as shown in figure 1 and comprises the following steps:

judging whether the opening degree of the accelerator exceeds a preset opening degree or not, and judging whether the difference between the requested torque of the engine and the maximum capacity torque of the engine exceeds a preset torque difference value or not;

if the throttle opening exceeds the preset opening and the torque difference does not exceed the preset torque difference, the large throttle torque request control is activated, and throttle dynamic control and oil injection enrichment control are simultaneously carried out;

during dynamic control of the throttle valve, the throttle valve is in a full-open mode or a non-full-open mode in a subsection mode according to the range of the difference between the actual gas pressure at the inlet of the throttle valve and the target gas pressure at the outlet of the throttle valve or the difference between the actual gas pressure at the outlet of the throttle valve, the difference between the target gas pressure at the outlet of the throttle valve and the actual pressure is controlled not to exceed 2kPa, and the control torque precision range is not to exceed +/-5%;

during the fuel injection enrichment control, the current fuel injection enrichment factors are gradually accumulated in a certain period, and the final fuel injection enrichment factor does not exceed the maximum enrichment factor determined by the engine speed and the load.

It can be seen that the present invention determines the activation conditions for the large throttle torque request control:

1) when the accelerator opening exceeds the preset opening, the accelerator opening which is satisfied by the control activation of the large accelerator torque request exceeds 95% in the embodiment of the invention, and the accelerator opening which is out of the control condition of the large accelerator torque request is less than 92%. The purpose of setting the hysteresis is to ensure the steady-state performance of the control system and avoid that the activation condition exits from entering too frequently due to large unstable fluctuation of accelerator release of a driver, and the accuracy of the control system is poor;

2) the difference between the engine requested torque (based on the flywheel end) and the maximum engine capacity torque (based on the flywheel end) does not exceed a preset torque difference value, and 10Nm is taken in the preferred embodiment of the invention.

In addition, whether the fuel injection enrichment mode is entered or not is judged according to the scavenging working condition of the engine, and if the engine is not in the scavenging fuel enleanment working condition and after the scavenging fuel enleanment working condition is ended for a preset time T1 (2 s in the example), the fuel injection enrichment mode is entered. Injection enrichment due to the scavenging fuel enleanment condition can cause fuel injection disturbances.

And when the conditions are simultaneously met, the dynamic control of the throttle valve and the oil injection enrichment control under the control of the large throttle torque are carried out.

As shown in fig. 2, during the throttle dynamics control, the stepwise control is specifically performed:

s201, judging whether the difference between the actual gas pressure at the inlet of the throttle valve and the target gas pressure at the outlet of the throttle valve exceeds a first preset pressure A, if so, executing a step S202, and if not, executing a step S203;

s202, enabling the throttle valve to enter a non-full-open mode;

s203, continuously judging whether the difference between the actual gas pressure at the inlet and the actual gas pressure at the outlet of the throttle valve is smaller than a second preset pressure B, if so, entering a step S204, and if not, executing a step S205;

s204, enabling the throttle valve to enter a full-open mode;

s205, continuously judging whether the difference between the actual gas pressure at the inlet of the throttle valve and the target inlet gas pressure at the outlet of the throttle valve is smaller than a third preset pressure C, if so, executing a step S204, and enabling the throttle valve to enter a full-open mode; if not, go to step S206;

s206, continuously judging whether the difference between the actual gas pressure at the inlet of the throttle valve and the actual gas pressure at the outlet of the throttle valve is larger than a fourth preset pressure D, if so, entering a step S202, and if not, executing other steps.

The first preset pressure A is greater than a third preset pressure C, the second preset pressure B is greater than a fourth preset pressure D, the first preset pressure A is smaller than a first pressure threshold A 'under the condition that the large throttle torque request is not activated, the second preset pressure B is greater than a second pressure threshold B' under the condition that the large throttle torque request is not activated, the third preset pressure C is greater than a third pressure threshold C 'under the condition that the large throttle torque request is not activated, and the fourth preset pressure D is smaller than a fourth pressure threshold D' under the condition that the large throttle torque request is not activated. Further, the first pressure threshold a 'is greater than the third pressure threshold C', and the second pressure threshold B 'is greater than the fourth pressure threshold D'.

Further, in another embodiment of the present invention, during the activation condition of the large throttle torque request control, the throttle dynamic control change rate is adjusted, that is, the optimization control is performed, specifically, the following segment control is performed:

1) when the difference between the actual gas pressure at the inlet of the throttle valve and the target gas pressure at the outlet of the throttle valve exceeds a preset pressure A, the throttle valve enters a non-full-open mode, wherein A is 5kPa in the example; the preset pressure A is certainly smaller than the preset pressure A' (10 kPa is taken in the example) under the condition that the large throttle torque request is not activated, the aim of consideration is to reduce the working condition frequency of the throttle valve entering the full-open mode as far as possible, the torque is achieved through oil injection enrichment, and meanwhile, the throttle valve is not fully opened to dynamically control to stabilize the control of the air intake pressure (the air intake pressure can be controlled by adjusting the opening of the throttle valve when the throttle valve is not fully opened, if the throttle valve is in the full-open mode, the throttle valve cannot act, and the precision of controlling the air intake pressure through other actuators is poor), so that the precision of the torque is improved.

The absolute value d1 of the rate of change of the effective area limit is 40mm in the non-wide open throttle mode²/ms。

2) When the difference between the actual gas pressure at the inlet and the actual gas pressure at the outlet of the throttle valve is smaller than a preset pressure B, the throttle valve enters a full-open mode, wherein B is 3kPa in the example; the preset pressure B is certainly larger than the preset pressure B' (2 kPa is adopted in the embodiment) under the condition that the large throttle torque request is not activated, the aim of the consideration is to ensure that the working condition that the throttle enters the full-open mode is less, the torque is achieved through fuel injection enrichment, and meanwhile, the control of the intake pressure is stabilized through the non-full-open dynamic control of the throttle, so that the torque precision is improved. In the full-open throttle mode, in order to protect the motor from being damaged due to excessive current of the throttle motor, the change rate of the effective area of the throttle valve needs to be reduced, wherein the change rate of the increase of the effective area of the throttle valve is d 3-0.3 mm²The change rate of the reduction of the effective area of the throttle valve is d 4-20 mm²And the setting of the change rate of the increase of the area of the throttle valve is smaller than the setting of the change rate of the decrease before the throttle valve is adjusted, the current is prevented from being too large when the throttle valve is increased, and the throttle valve is rapidly reduced when the throttle valve is decreased to rapidly enter a non-full-open mode to accurately control the air inlet pressure.

3) When the difference between the actual gas pressure at the inlet of the throttle valve and the target inlet gas pressure at the outlet of the throttle valve is smaller than a preset pressure C, the throttle valve enters a full-open mode, wherein C is-1 kPa in the example; the preset pressure C is certainly larger than the preset pressure C' (6 kPa is adopted in the embodiment) under the condition that the large throttle torque request is not activated, the aim of consideration is to ensure that the working condition that the throttle valve enters the full-open mode is less, the torque is achieved through fuel injection enrichment, and meanwhile, the control of the intake pressure is stabilized through the non-full-open dynamic control of the throttle valve, so that the torque precision is improved.

4) In the full throttle mode, in order to protect the motor from being damaged due to excessive current of the throttle motor, the change rate of the effective throttle area is reduced, wherein the change rate of the increased effective throttle area is d 5-0.2 mm²The change rate of the reduction of the effective area of the throttle valve is d 6-16 mm²And the setting of the change rate of the increase of the area of the throttle valve is smaller than the setting of the change rate of the decrease of the area of the throttle valve, the current is prevented from being too large when the throttle valve is increased, and the throttle valve is rapidly reduced when the throttle valve is decreased to rapidly enter a non-full-open mode to accurately control the air inlet pressure. The reason why d5 and d6 are smaller than the change rate in case 2 is that the case 2) is not satisfied, the routine proceeds to case 3), which means that the change rate setting in case 2 cannot be satisfied, and here, the throttle change rate is further limited to ensure pressure stability. When the difference between the actual gas pressure at the inlet of the throttle valve and the actual gas inlet pressure at the outlet of the throttle valve is greater than a preset pressure D, the throttle valve enters a non-full-open mode, wherein D is 2kPa in the example; the preset pressure D is certainly smaller than the preset pressure D' (1 kPa is taken in the example) under the condition that the large throttle torque request is not activated, the aim of the consideration is to ensure that the working condition that the throttle enters the full-open mode is less, the torque is achieved through oil injection and enrichment, and meanwhile, the control of the intake pressure is stabilized through the non-full-open dynamic control of the throttle, so that the torque precision is improved. The absolute value d2 of the rate of change of the effective area of the restriction is 28mm in the non-wide open throttle mode²(ms); the reason why the allowable range of the throttle change rate is lower than that in the 1 st setting mode when the throttle is not fully opened is that the mode can be shifted to the 4 th mode when the 1 st condition is not satisfied, and it is described that the setting of the change rate in the 1 st mode cannot be satisfied, and this is the case where the setting of the throttle change rate is performed when the setting of the throttle change rate in the 1 st mode is not satisfiedThe throttle valve change rate is further limited, and the pressure stability is ensured.

5) In other cases, the throttle mode is maintained as the last throttle mode, wherein the throttle control mode is not fully open when the vehicle is powered up.

A is smaller than A' because after A becomes smaller, the throttle valve under the 1) th condition has more working conditions and more access opportunities, the throttle valve is used as a component for accurately controlling pressure, the pressure accuracy can be ensured, the working conditions of the throttle valve entering the full opening condition are more, the torque can be relatively reduced, and the torque can be achieved in an oil injection enrichment mode at the moment. Other BCDs are designed with the same objective in mind.

For the purpose that a is greater than C (a 'is greater than C'), the throttle opening may be decreased, i.e., the non-fully-open mode may be entered, only if the inlet gas pressure is greater than the outlet target pressure, which means that the outlet pressure may be controlled in such a manner that the throttle valve is throttled to make the actual pressure follow the target pressure. Conversely, the inlet gas pressure is smaller than the outlet target pressure to a certain extent, and the throttle valve needs to be controlled to be fully opened to meet the requirement of intake pressure

For the purpose that B is greater than D (B 'is greater than D'), the throttle opening may be decreased, i.e., the non-fully-open mode may be entered, only if the inlet gas pressure is greater than the outlet actual pressure, which means that the outlet pressure may be controlled by way of throttle valve throttling so that its actual pressure follows the target pressure. On the contrary, the inlet gas pressure is smaller than the actual outlet pressure to a certain extent, and at the moment, the throttle valve needs to be controlled to be fully opened to meet the requirement of the intake pressure.

The above throttle control modes 1) -5) the priority is gradually lowered. Tests show that the difference between the target gas pressure and the actual pressure at the outlet of the throttle valve can be guaranteed not to exceed 2kPa under the dynamic working condition to the optimal degree after the setting, so that the torque precision is guaranteed to be within the range required by the design (the torque precision range within 100Nm is not more than +/-5 Nm, and the torque precision range exceeding 100Nm is not more than +/-5%)

When the throttle valve is in the full-open mode, electricity is damaged in order to protect the throttle valve motor from overlarge currentThe change rate of the effective area of the throttle valve is required to be reduced, wherein the change rate of the increase of the effective area of the throttle valve is 0.3mm²(ms) the rate of change of reduction of the effective area of the throttle is 20mm²And the setting of the change rate of the increase of the area of the throttle valve is smaller than the setting of the change rate of the decrease before the throttle valve is adjusted, the current is prevented from being too large when the throttle valve is increased, and the throttle valve is rapidly reduced when the throttle valve is decreased to rapidly enter a non-full-open mode to accurately control the air inlet pressure.

When the large throttle torque request control is activated, the throttle valve is dynamically adjusted and controlled, and meanwhile, oil injection and enrichment are properly carried out; when heavy-load oil injection enrichment is carried out, some special working conditions of the engine are removed firstly, the heavy-load enrichment request of the patent has higher priority than other oil injection enrichment/enleanment requests (such as an enrichment request controlled by a catalyst and a GPF enrichment request), but is lower than the oil injection enrichment, the knock enrichment and the exhaust temperature protection enrichment during the starting process of the engine (namely, the oil injection enrichment request under the condition of heavy-load activation is not allowed in the starting enrichment process, the knock enrichment or the exhaust temperature protection enrichment).

After the request for fuel injection enrichment is activated, the current fuel injection enrichment factor is gradually accumulated in a certain period (10 ms in the example), the accumulated value is m (0.05 is accumulated every 10ms in the example), and the final fuel injection enrichment factor does not exceed the maximum enrichment factor r _ Max determined by the engine speed and the load (see the following table 1).

TABLE 1 maximum enrichment factor r _ Max at different engine speeds and loads

The method for determining the maximum enrichment factor comprises the following steps: enrichment is continued under the current working condition, and the emission is increased instead of increasing the torque.

As the engine lifecycle progresses, some components may age and the ability of the fuel injection enrichment to increase torque may be diminished. By monitoring the torque boosting effect after the instant of the enrichment in real time, during each driving cycle, if the number of times that the torque boosting effect does not exceed a certain preset torque (2% of the torque in this example) before the enrichment is used exceeds a preset number Cnt (1250 in this example) and is maintained within a preset time T2(2.5s) under a certain working condition (fixed speed and load), the enrichment factor of the working condition is reduced, each reduction factor is set to 0.0002 in this example, and the reduction factors of the adjacent working conditions of the corresponding working condition are reduced by 0.00005 in this example each time (2800,100) is reduced by 0.0002 in this time (2800,125) and (3200,100) when the torque at 100mg/l is not increased by 2% in the engine speed 2800rpm in the above table), the enrichment is stopped until the enrichment factor is 1, and the enrichment is electrically turned off and is stored, and is not erased.

And gradually quitting to a state without large throttle torque oil injection enrichment when the oil injection enrichment condition of large throttle torque control is not met, namely reducing the enrichment factor by 0.02 every 10 ms. The enrichment factor is used as a multiplication factor for fuel injection quantity compensation, and accordingly, the engine big throttle torque control method is achieved.

The present invention also provides a computer-readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, a server, an App application mall, etc., on which a computer program is stored, which when executed by a processor implements corresponding functions. The computer program stored in the computer readable storage medium of the embodiment of the invention, when executed by the processor, implements the steps of the engine throttle torque control method of the embodiment described above.

In conclusion, the engine big throttle torque control method provided by the invention is mainly used for carrying out throttle valve dynamic optimization control and fuel injection control under the engine big throttle torque control by setting the activation condition of the engine big throttle torque control request, so that the stability and reliability of external characteristic torque in the engine bench test process are ensured, the torque control stability and precision under the whole vehicle big throttle are ensured, the service life of engine parts is improved, and the dynamic property of the engine, the vehicle stability and the driver comfort are also optimized.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.