阅读说明：本技术 一种用于进气翻板的控制方法、车辆及存储介质 (Control method for air inlet turning plate, vehicle and storage medium ) 是由 苍贺成 王强 张慧峰 周鑫 苗志慧 陈昊 时宪 于 2020-07-14 设计创作，主要内容包括：本发明公开了一种用于进气翻板的控制方法、车辆及存储介质,属于发动机技术领域。所述控制方法包括步骤：S11：判断位置传感器是否正常,若正常,则进行如下步骤：S111：根据发动机转速和负荷做滞回计算,并通过查表确定翻板是否需要翻转,若是,则进行下一步骤；若否,则翻板位置保持不变；S112：计算油门踏板的变化梯度；S113：判断所述油门踏板的变化梯度是否小于等于第一阈值,若是,则进行下一步骤；若否,则驱动所述翻板动作；S114：判断所述发动机负荷的变化方向是否为由小到大,若是,则驱动所述翻板动作的同时,协调点火角与空燃比；若否,则先主动进行扭矩储备,当驱动所述翻板动作时,协调所述点火角及所述空燃比。本发明能够提升车辆的驾驶性。(The invention discloses a control method for an air inlet turning plate, a vehicle and a storage medium, and belongs to the technical field of engines. The control method comprises the following steps: s11: judging whether the position sensor is normal, if so, performing the following steps: s111: performing hysteresis calculation according to the rotating speed and the load of the engine, determining whether the turning plate needs to be turned over or not by looking up a table, and if so, performing the next step; if not, the position of the turning plate is kept unchanged; s112: calculating the variation gradient of the accelerator pedal; s113: judging whether the change gradient of the accelerator pedal is less than or equal to a first threshold value, and if so, performing the next step; if not, driving the turning plate to act; s114: judging whether the change direction of the engine load is from small to large, if so, driving the turning plate to act and simultaneously coordinating an ignition angle and an air-fuel ratio; if not, torque is reserved actively, and when the flap is driven to act, the ignition angle and the air-fuel ratio are coordinated. The invention can improve the driving performance of the vehicle.)

1. A control method for an air intake flap, characterized by comprising the following steps:

s11: judging whether the position sensor is normal, if so, performing the following steps:

s111: performing hysteresis calculation according to the rotating speed and the load of the engine, determining whether the turning plate needs to be turned over or not by looking up a table, and if so, performing the next step; if not, the position of the turning plate is kept unchanged;

s112: calculating the variation gradient of the accelerator pedal;

s113: judging whether the change gradient of the accelerator pedal is less than or equal to a first threshold value, and if so, performing the next step; if not, directly driving the turning plate to act;

s114: judging whether the change direction of the engine load is from small to large, if so, driving the turning plate to act and simultaneously coordinating an ignition angle and an air-fuel ratio; if not, torque is reserved actively, and the ignition angle and the air-fuel ratio are coordinated when the flap is driven to act.

2. The control method according to claim 1, wherein in step S11, if the position sensor is not normal, the following steps are performed;

s12: and judging whether the pressure of the vacuum cavity of the vacuum unit meets the requirement, if so, executing the closing action of the turning plate by the air inlet turning plate.

3. The control method according to claim 2, wherein in step S12, if the vacuum chamber pressure does not meet the requirement, the following steps are performed:

s13: judging whether the air inlet turning plate is in a fault state and then waiting for recovering the control state, if so, driving the turning plate to be closed or opened so as to enable the turning plate to correspond to the turning plate position detected by the position sensor; if not, the position of the turning plate is kept unchanged.

4. The control method according to claim 3, wherein in step S13, if the intake flap does not belong to a post-failure standby control state, the following steps are performed:

s14: setting an ignition angle of an engine as a value when the turning plate is in a closed state, and judging that the turning plate is in an open state if the engine knocks at a certain frequency; and if the engine does not knock with certain frequency, judging that the turning plate is in a closed state.

5. The control method according to any one of claims 1 to 4, characterized by, before step S11, further comprising the steps of:

s10: and judging whether the working conditions of the air inlet turning plate are met, if so, carrying out the next step, and if not, keeping the position of the turning plate unchanged.

6. The control method according to claim 5, wherein step S10 specifically includes the steps of:

s101: and judging whether the voltage of the storage battery is too high, if so, keeping the position of the turning plate unchanged.

7. The control method according to claim 6, wherein in step S101, if the battery voltage is not too high, the following steps are performed:

s102: and judging whether the water temperature and the ambient temperature of the engine meet working conditions, if so, carrying out the next step, and if not, keeping the position of the turning plate unchanged.

8. The control method of claim 1, wherein the default position of the flap is an open state.

9. A vehicle, characterized in that the vehicle comprises:

one or more processors;

a memory for storing one or more programs;

when executed by the one or more processors, cause the one or more processors to implement the control method for an intake flap as claimed in claims 1-8.

10. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, carries out a control method for an intake flap as claimed in claims 1 to 8.

Technical Field

The invention relates to the technical field of engines, in particular to a control method for an air inlet turning plate, a vehicle and a storage medium.

Background

The air inlet turning plate is an adjusting system arranged for controlling air inlet amount and air flow state of the engine, and specifically comprises a turning plate, a turning actuating mechanism, a position sensor, a vacuum unit and the like; the vacuum unit is used for driving the turnover executing mechanism to execute actions to drive the turnover plate to turn over, so that the air input and the air flow state of the engine can be adjusted. Specifically, the vacuum unit comprises a vacuum cavity and a vacuum control valve, and the vacuum control valve drives the overturning actuating mechanism to perform action by changing vacuum pressure in the vacuum cavity.

In a specific use process, the air inlet turning plate can be damaged by parts, so that the air inlet turning plate can not effectively drive the turning plate to act; or the air inflow is suddenly changed when the turning plate is closed or opened, so that the sudden change of the engine torque is caused, and the like; the above conditions all affect the power performance and the emission performance of the engine, and at the same time, lead to poor drivability of the vehicle.

Therefore, it is desirable to provide a control method for an intake flap, a vehicle and a storage medium to solve the above problems.

Disclosure of Invention

The invention provides a control method for an air inlet turning plate, which can reasonably control the turning plate to act, improve the power performance and the emission performance of an engine and ensure the good driving performance of a vehicle.

In order to realize the purpose, the following technical scheme is provided:

in a first aspect, an embodiment of the present invention provides a control method for an intake flap, including the following steps:

s11: judging whether the position sensor is normal, if so, executing the action of the air inlet turning plate according to the working condition of the engine, and specifically comprising the following steps of:

s111: performing hysteresis calculation according to the rotating speed and the load of the engine, determining whether the turning plate needs to be turned over or not by looking up a table, and if so, performing the next step; if not, the position of the turning plate is kept unchanged;

s112: calculating the variation gradient of the accelerator pedal;

s113: judging whether the change gradient of the accelerator pedal is less than or equal to a first threshold value, and if so, performing the next step; if not, directly driving the turning plate to act;

s114: judging whether the change direction of the engine load is from small to large, if so, driving the turning plate to act and simultaneously coordinating an ignition angle and an air-fuel ratio; if not, torque is reserved actively, and the ignition angle and the air-fuel ratio are coordinated when the flap is driven to act.

Preferably, in step S11, if the position sensor is not normal, the following steps are performed;

s12: and judging whether the pressure of the vacuum cavity of the vacuum unit meets the requirement, if so, executing the closing action of the turning plate by the air inlet turning plate.

Preferably, in step S12, if the vacuum chamber pressure does not satisfy the requirement, the following steps are performed:

s13: judging whether the air inlet turning plate is in a fault state and then waiting for recovering the control state, if so, driving the turning plate to be closed or opened so as to enable the turning plate to correspond to the turning plate position detected by the position sensor; if not, the position of the turning plate is kept unchanged.

Preferably, in step S13, if the intake flap does not belong to the post-failure standby control state, the following steps are performed:

s14: setting an ignition angle of an engine as a value when the turning plate is in a closed state, and judging that the turning plate is in an open state if the engine knocks at a certain frequency; and if the engine does not knock with certain frequency, judging that the turning plate is in a closed state.

Preferably, before step S11, the method further includes the following steps:

s10: and judging whether the working conditions of the air inlet turning plate are met, if so, carrying out the next step, and if not, keeping the position of the turning plate unchanged.

Preferably, step S10 specifically includes the following steps:

s101: and judging whether the voltage of the storage battery is too high, if so, keeping the position of the turning plate unchanged.

Preferably, in step S101, if the battery voltage is not too high, the following steps are performed:

s102: and judging whether the water temperature and the ambient temperature of the engine meet working conditions, if so, carrying out the next step, and if not, keeping the position of the turning plate unchanged.

Preferably, the default position of the flap is an open state.

In a second aspect, an embodiment of the present invention provides a vehicle, including:

one or more processors;

a memory for storing one or more programs;

when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement any of the above-described control methods for an intake flap.

In a third aspect, embodiments of the present invention provide a computer-readable storage medium, on which a computer program is stored, which program, when executed by a processor, implements any of the above-described control methods for an intake flap.

The invention has the beneficial effects that:

the control method for the air inlet turning plate provided by the invention comprises the steps of firstly carrying out fault judgment on the position sensor, judging whether the turning plate needs to be turned or not according to a hysteresis calculation result when the position sensor can be used normally, and further judging and controlling according to the change gradient of an accelerator pedal and the change direction of the engine load if the turning plate needs to be operated, so that the torque is stably output when the turning plate is closed or opened, the driving performance of a vehicle is further improved, and the power performance and the emission performance of an engine are improved.

Drawings

Fig. 1 is a control flow chart of a control method for an intake flap in an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Referring to fig. 1, the present embodiment provides a control method for an intake flap, which specifically includes the following steps:

s11: judging whether the position sensor is normal, if so, executing action by the air inlet turning plate according to the working condition of the engine; if not, the next step is carried out;

s12: judging whether the pressure of the vacuum cavity of the vacuum unit meets the requirement, if so, executing the closing action of the turning plate by the air inlet turning plate; if not, entering the next step;

s13: judging whether the air inlet turning plate is in a fault state and then waiting for the control state to be recovered, if so, driving the turning plate to be closed or opened so as to enable the turning plate to correspond to the turning plate position detected by the position sensor; if not, the position of the turning plate is kept unchanged.

In step S11, if the position sensor is working normally, the following steps are specifically implemented:

s111: performing hysteresis calculation according to the rotating speed and the load of the engine, determining whether the turning plate needs to be turned over or not by looking up a table, and if so, performing the next step; if not, the position of the turning plate is kept unchanged;

s112: calculating the variation gradient of the accelerator pedal;

s113: judging whether the change gradient of the accelerator pedal is less than or equal to a first threshold value, and if so, performing the next step; if not, directly driving the turning plate to act;

s114: judging whether the change direction of the engine load is from small to large, if so, driving the turning plate to act and simultaneously coordinating an ignition angle and an air-fuel ratio; if not, torque is reserved actively, and the ignition angle and the air-fuel ratio are coordinated when the flap is driven to act.

In step S113, the first threshold is a critical value of a gradient of change of the accelerator pedal at which the driver can feel torque shock caused by a change of the air volume generated by the flap turnover; if the gradient of the accelerator pedal is larger than the critical value, the driver cannot feel torque impact caused by turnover of the turnover plate, and the turnover plate can directly act; on the contrary, if the gradient of the accelerator pedal is less than or equal to the critical value, the driver can feel torque impact caused by turnover of the turning plate, and the next judgment is needed. In specific implementation, the first threshold may be specifically calibrated according to different driver experiences.

According to the control method for the air inlet turning plate, firstly, fault judgment is carried out on the position sensor, when the position sensor can be used normally, whether turning plate overturning is needed or not is judged according to a hysteresis calculation result, if the turning plate is needed to act, further judgment and control are carried out according to the change gradient of an accelerator pedal and the change direction of engine load, stable output of torque is guaranteed when the turning plate is closed or opened, the driving performance of a vehicle is improved, and meanwhile the power performance and the emission performance of an engine are improved.

In step S111, two situations that the flap needs to be turned over are obtained by looking up a table according to the hysteresis calculation result, one is that the flap needs to be turned over from a closed state to an open state, and the other is that the flap needs to be turned over from the open state to the closed state. If the turning plate is directly subjected to position conversion, the change gradient of an accelerator pedal and the change direction of the engine load are not considered, the position change of the turning plate can cause the air inflow and the air inflow state of the engine to be suddenly changed, and further the torque cannot be stably output. Therefore, the application provides that before the position of the turning plate is switched, the gradient change of the accelerator pedal and the change direction of the engine load are fully considered, the action of the turning plate is reasonably controlled, and the unstable output of the torque caused by the sudden change of the air inflow is avoided. Specifically, when the gradient of the change of the accelerator pedal is greater than a first threshold value, the change is relatively fast and does not belong to slow change, the opening or closing action of the turning plate does not influence the stable output of the torque, and the torque reserve and the coordination of the ignition angle and the air-fuel ratio do not need to be considered at the moment; when the change gradient of the accelerator pedal is smaller than or equal to the first threshold, the change is slow and belongs to slow change, and at the moment, the action of the turning plate and the control strategy of the engine need to be coordinated according to the change direction of the load of the engine. More specifically, when the load of the engine is changed from small to large, the air inflow needs to be expanded, so that the turning plate needs to be opened from closed, and the ignition angle and the air-fuel ratio need to be coordinated to be matched with the air inflow; specifically, the turning plate is opened to cause the rapid increase of air inflow, the torque of the engine can also rapidly rise, the ignition angle can be processed at the back angle, the rising process of the torque and the increasing process of the air inflow are balanced, and the stable output of the torque is guaranteed. When the engine load is reduced from large to small, the turning plate is opened to closed, so that the impact of sudden reduction of air inflow caused by closing of the turning plate on torque is avoided, torque reserve can be actively carried out before the engine load enters a to-be-converted area, namely, a part of torque is reserved through angle receding processing of an ignition angle, and after the turning plate is closed, the part of torque can be released, and meanwhile, stable output of the torque can be realized through coordination of the ignition angle and the air-fuel ratio.

Specifically, in step S11, it is determined whether the position sensor is normal, and the self-checking and self-learning of the position sensor are performed to observe whether the feedback is normally performed, and if the feedback is normally performed, it indicates that the position sensor is normal, otherwise, the feedback is not normal, and the position sensor cannot operate.

In this embodiment, the default state of the turning plate is the open state, that is, when the turning actuator does not perform the action, the turning plate is kept in the open state, and only when the vacuum unit drives the turning actuator to act, the turning plate can be closed. Therefore, in step S12, it is determined whether the vacuum chamber pressure meets the requirement, and in fact, it is determined whether the vacuum chamber pressure can meet the requirement of the turnover executing mechanism for executing the turning plate closing action; if the pressure of the vacuum cavity meets the requirement, the air inlet turning plate executes the closing action of the turning plate, and further verification is realized; however, if the vacuum unit is damaged at this time, and the pressure of the vacuum cavity cannot meet the requirement, the air inlet turning plate cannot execute the closing action of the turning plate, and the normal control of the whole engine is affected, so that the fault judgment of the vacuum unit needs to be performed by setting such a step.

Step S13 is set because the fault of the position sensor and the vacuum unit usually needs a certain time, and can be cleared after self-recovery or later-stage human intervention maintenance, and the air-intake flap may not be immediately controlled after clearing, and at this time, it needs to judge whether it is a state waiting for recovery control after the fault, if yes, the position sensor can work normally, and the vacuum unit can also work normally; but the control state is only to be recovered at the moment, and the flap is not really controlled, so that the actual position of the flap can be obtained through a normal position sensor at the moment, then the states of the vacuum unit and the turnover actuating mechanism correspond to the actual position of the flap, and the whole air inlet flap is in a normal state after the control state is subsequently recovered.

Further, in step S13, when the intake flap is not in the control state waiting to be recovered after the failure, it indicates that the failure of the position sensor or the vacuum unit has not been completely cleared, and at this time, if the flap cannot be recovered (i.e., the flap is recovered to the open state), the control strategy of the engine needs to be adjusted to enable the engine to still output efficiently, so as to improve the power performance and the emission performance of the engine. Therefore, at this time, the state of the position of the flap needs to be determined, that is, the control method further includes the following steps:

s14: setting the ignition angle of the engine as a value when the turning plate is in a closed state, and judging that the turning plate is in an open state if the engine knocks at a certain frequency; if the engine does not knock with a certain frequency, the turning plate is judged to be in a closed state.

The arrangement of the step S14 is beneficial to knowing the actual position of the turning plate, so that the engine can be reasonably arranged in the next control scheme, and the efficient output of the engine is ensured. For example, when the turning plate is in a closed state, the air inflow is small, the airflow state is a high tumble state, the ignition angle of the engine can be advanced, the efficiency of the engine is improved, and the whole engine can output efficiently.

Further, step S11 of the control method further includes the following steps before:

s10: judging whether the working conditions of the air inlet turning plate are met, if so, carrying out the next step, and otherwise, outputting default state control; specifically, the default state control is that the flap position is not changed.

The working conditions mentioned here include battery voltage, water temperature of the engine, and ambient temperature; if the voltage of the battery is too high, all electric elements of the engine, such as a position sensor in the air inlet turning plate, a vacuum control valve and other electric elements, can not work; similarly, even if the voltage of the battery meets the use condition, the air inlet turning plate can not work when the water temperature and the ambient temperature of the engine do not meet the conditions. Namely, any one of the conditions of the voltage of the storage battery, the water temperature of the engine and the ambient temperature is not satisfied, the air inlet turning plate cannot drive the turning plate to act, and the turning plate can only keep the conventional turning position unchanged. Therefore, step S10 specifically includes the following steps:

s101: judging whether the voltage of the storage battery is too high, if so, keeping the position of the turning plate unchanged; if not, carrying out the next step;

s102: and judging whether the water temperature and the ambient temperature of the engine meet working conditions, if so, carrying out the next step, and otherwise, keeping the position of the turning plate unchanged.

In the above embodiment, each included module is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be realized; in addition, the specific names of the functional modules are only for convenience of distinguishing from each other and are not used for limiting the protection scope of the present invention.