阅读说明：本技术 混动汽车的真空泵控制方法、装置、系统及存储介质 (Vacuum pump control method, device and system for hybrid electric vehicle and storage medium ) 是由 崔帅 范琦辉 张春广 赵勇智 蒋鹏宇 李亚南 张波 孙玉 徐波 曹昊 李宗涛 于 2018-06-28 设计创作，主要内容包括：本发明涉及车辆技术领域,提供一种混动汽车的真空泵控制方法、装置、及系统。所述真空泵控制方法包括：实时获取真空度信号；当真空度信号高于电子真空泵的第一预设关闭值时,控制电子真空泵停止工作,否则持续工作,并记录持续工作时间；在发动机工作模式下,检测是否存在电子真空泵工作信号,若是则控制电子真空泵持续工作,否则停止工作；以及在纯电工作模式下,若真空度信号未达到第一预设关闭值,且持续工作时间达到安全工作时间,则降低第一预设关闭值以重新判断真空度信号是否达到新的关闭值,若是则控制电子真空泵停止工作,否则继续工作或启动发动机工作模式。本发明减小了对电子真空泵的过载能力的依靠,提升了整车制动性能的安全性。(The invention relates to the technical field of vehicles, and provides a vacuum pump control method, device and system for a hybrid electric vehicle. The vacuum pump control method includes: acquiring a vacuum degree signal in real time; when the vacuum degree signal is higher than a first preset closing value of the electronic vacuum pump, controlling the electronic vacuum pump to stop working, otherwise, continuously working, and recording the continuous working time; under the working mode of the engine, detecting whether an electronic vacuum pump working signal exists or not, if so, controlling the electronic vacuum pump to continuously work, otherwise, stopping working; and under the pure electric working mode, if the vacuum degree signal does not reach a first preset closing value and the continuous working time reaches the safe working time, reducing the first preset closing value to judge whether the vacuum degree signal reaches a new closing value again, if so, controlling the electronic vacuum pump to stop working, otherwise, continuing to work or starting the engine working mode. The invention reduces the dependence on the overload capacity of the electronic vacuum pump and improves the safety of the braking performance of the whole vehicle.)

1. A vacuum pump control method of a hybrid electric vehicle is characterized in that the vacuum pump comprises an electronic vacuum pump and a mechanical vacuum pump which respectively provide a path of vacuum source for a vacuum booster of the hybrid electric vehicle, and the vacuum pump control method of the hybrid electric vehicle comprises the following steps:

a signal acquisition step, namely acquiring a vacuum degree signal in the vacuum booster in real time;

a first control step, when the vacuum degree signal is higher than a first preset closing value of the electronic vacuum pump, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to continuously work, and recording the continuous working time of the electronic vacuum pump in real time;

a second control step, when the hybrid electric vehicle runs in an engine working mode, detecting whether an electronic vacuum pump working signal exists or not, if so, controlling the electronic vacuum pump to continuously work, otherwise, controlling the electronic vacuum pump to stop working; and

and a third control step, wherein when the hybrid electric vehicle runs in a pure electric working mode, if the vacuum degree signal does not reach the first preset closing value and the continuous working time reaches the safe working time of the electronic vacuum pump, the first preset closing value is reduced to judge whether the vacuum degree signal reaches the reduced closing value again, if so, the electronic vacuum pump is controlled to stop working, otherwise, the electronic vacuum pump is controlled to continue working or start the engine working mode.

2. The vacuum pump control method of a hybrid vehicle according to claim 1, wherein the third control step specifically includes:

if the vacuum degree signal does not reach the first preset closing value and the continuous working time reaches a first preset safe time, reducing a closing threshold value of the electronic vacuum pump to a second preset closing value of the electronic vacuum pump, if the vacuum degree signal reaches the second preset closing value, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to continue working;

if the vacuum degree signal does not reach the second preset closing value and the continuous working time reaches second preset safe time, reducing the closing threshold value of the electronic vacuum pump to a third preset closing value of the electronic vacuum pump, if the vacuum degree signal reaches the third preset closing value, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to continue working; and

if the vacuum degree signal does not reach the third preset closing value and the continuous working time reaches the third preset safe time, reducing the closing threshold value of the electronic vacuum pump to a fourth preset closing value of the electronic vacuum pump, if the vacuum degree signal reaches the fourth preset closing value, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to stop working and starting the engine working mode;

the first preset closing value, the second preset closing value, the third preset closing value and the fourth preset closing value are sequentially reduced, and the first preset safety time, the second preset safety time, the third preset safety time and the fourth preset safety time are sequentially increased.

3. The vacuum pump control method of a hybrid vehicle according to claim 1 or 2, further comprising,

and controlling the electronic vacuum pump to perform self-checking while controlling the electronic vacuum pump to stop working.

4. The vacuum pump control method of a hybrid vehicle according to claim 3, wherein the controlling the electronic vacuum pump to perform self-checking includes:

setting the pedal stroke to be 0, if the electronic vacuum pump works, judging whether a vacuum degree signal meets the first preset closing value or whether the interval preset self-checking times reach the electronic first preset closing value within set time, if so, recording a current fault code as a historical fault code, otherwise, recording the current fault code, and controlling a vehicle instrument to perform brake fault alarm.

5. A machine-readable storage medium having stored thereon instructions for causing a controller to execute the vacuum pump control method of a hybrid vehicle according to any one of claims 1 to 4.

6. The vacuum pump control device of the hybrid vehicle is characterized in that the vacuum pump includes an electronic vacuum pump and a mechanical vacuum pump which respectively provide a path of vacuum source for a vacuum booster of the hybrid vehicle, and the vacuum pump control device of the hybrid vehicle includes:

the signal acquisition module is used for acquiring a vacuum degree signal in the vacuum booster in real time;

the first control module is used for controlling the electronic vacuum pump to stop working when the vacuum degree signal is higher than a first preset closing value of the electronic vacuum pump, otherwise, controlling the electronic vacuum pump to continuously work, and recording the continuous working time of the electronic vacuum pump in real time;

the second control module is used for detecting whether an electronic vacuum pump working signal exists or not when the hybrid electric vehicle runs in an engine working mode, if so, controlling the electronic vacuum pump to continuously work, and otherwise, controlling the electronic vacuum pump to stop working; and

and the third control module is used for reducing the first preset closing value to judge whether the vacuum degree signal reaches the reduced closing value again if the vacuum degree signal does not reach the first preset closing value and the continuous working time reaches the safe working time of the electronic vacuum pump when the hybrid electric vehicle runs in a pure electric working mode, controlling the electronic vacuum pump to stop working if the vacuum degree signal reaches the reduced closing value, and controlling the electronic vacuum pump to continue working or start the engine working mode if the vacuum degree signal does not reach the reduced closing value.

7. The vacuum pump control device of a hybrid vehicle according to claim 6, wherein the third control module specifically includes:

the first control sub-module is used for reducing the closing threshold value of the electronic vacuum pump to a second preset closing value of the electronic vacuum pump when the vacuum degree signal does not reach the first preset closing value and the continuous working time reaches a first preset safe time, controlling the electronic vacuum pump to stop working if the vacuum degree signal reaches the second preset closing value, and otherwise controlling the electronic vacuum pump to continue working;

the second control sub-module is used for reducing the closing threshold value of the electronic vacuum pump to a third preset closing value of the electronic vacuum pump when the vacuum degree signal does not reach the second preset closing value and the continuous working time reaches a second preset safe time, and controlling the electronic vacuum pump to stop working if the vacuum degree signal reaches the third preset closing value, otherwise, controlling the electronic vacuum pump to continue working; and

the third control sub-module is used for reducing the closing threshold value of the electronic vacuum pump to a fourth preset closing value of the electronic vacuum pump when the vacuum degree signal does not reach the third preset closing value and the continuous working time reaches a third preset safe time, if the vacuum degree signal reaches the fourth preset closing value, the electronic vacuum pump is controlled to stop working, and if the vacuum degree signal does not reach the fourth preset closing value, the electronic vacuum pump is controlled to stop working and the engine working mode is started;

the first preset closing value, the second preset closing value, the third preset closing value and the fourth preset closing value are sequentially reduced, and the first preset safety time, the second preset safety time, the third preset safety time and the fourth preset safety time are sequentially increased.

8. The vacuum pump control apparatus of a hybrid vehicle according to claim 6 or 7, further comprising:

and the self-checking module is used for controlling the electronic vacuum pump to perform self-checking while controlling the electronic vacuum pump to stop working.

9. The vacuum pump control device of a hybrid vehicle according to claim 8, wherein the self-test module controlling the electronic vacuum pump to perform self-test includes:

setting the pedal stroke to be 0, if the electronic vacuum pump works, judging whether a vacuum degree signal meets the first preset closing value or whether the interval preset self-checking times reach the electronic first preset closing value within set time, if so, recording a current fault code as a historical fault code, otherwise, recording the current fault code, and controlling a vehicle instrument to perform brake fault alarm.

10. A vacuum pump control system of a hybrid vehicle, comprising:

an electronic vacuum pump;

a mechanical vacuum pump;

the vacuum booster is respectively connected with the electronic vacuum pump and the mechanical vacuum pump through vacuum pipelines;

the vacuum degree sensor is matched with the vacuum booster for mounting and is used for acquiring a vacuum degree signal in the vacuum booster; and

the vacuum pump control apparatus for a hybrid vehicle according to any one of claims 6 to 9, electrically connected to the electronic vacuum pump and the vacuum degree sensor, and configured to control the electronic vacuum pump according to the vacuum degree signal.

Technical Field

The present invention relates to the field of hybrid vehicles, and in particular, to a method, an apparatus, a system, and a storage medium for controlling a vacuum pump of a hybrid vehicle.

Background

With the increasing shortage of world energy demand, automobiles pay more attention to the problem of reducing oil consumption, and at present, national policies favor hybrid electric vehicles (hereinafter referred to as hybrid electric vehicles), and compared with traditional automobiles, hybrid electric vehicles have the advantage that the braking technology in the pure electric mode is popular with users. At present, more and more hybrid electric vehicles use a blade type electronic vacuum pump as a vacuum source of a braking system, so that the requirement on the reliability of the electronic vacuum pump on the whole vehicle is very high, and therefore, the electronic vacuum pump is protected, and the driving safety can be effectively ensured.

Disclosure of Invention

In view of the above, the present invention is directed to a method for controlling a vacuum pump of a hybrid vehicle to at least partially solve the above technical problems.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a vacuum pump control method of a hybrid electric vehicle is provided, wherein the vacuum pump comprises an electronic vacuum pump and a mechanical vacuum pump which respectively provide a path of vacuum source for a vacuum booster of the hybrid electric vehicle, and the vacuum pump control method of the hybrid electric vehicle comprises the following steps: a signal acquisition step, namely acquiring a vacuum degree signal in the vacuum booster in real time; a first control step, when the vacuum degree signal is higher than a first preset closing value of the electronic vacuum pump, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to continuously work, and recording the continuous working time of the electronic vacuum pump in real time; a second control step, when the hybrid electric vehicle runs in an engine working mode, detecting whether an electronic vacuum pump working signal exists or not, if so, controlling the electronic vacuum pump to continuously work, otherwise, controlling the electronic vacuum pump to stop working; and a third control step, when the hybrid electric vehicle runs in a pure electric working mode, if the vacuum degree signal does not reach the first preset closing value, and the continuous working time reaches the safe working time of the electronic vacuum pump, the first preset closing value is reduced to judge again whether the vacuum degree signal reaches the closing value after reduction, if so, the electronic vacuum pump is controlled to stop working, otherwise, the electronic vacuum pump is controlled to continue working or start the engine working mode.

Further, the third control step specifically includes: if the vacuum degree signal does not reach the first preset closing value and the continuous working time reaches a first preset safe time, reducing a closing threshold value of the electronic vacuum pump to a second preset closing value of the electronic vacuum pump, if the vacuum degree signal reaches the second preset closing value, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to continue working; if the vacuum degree signal does not reach the second preset closing value and the continuous working time reaches second preset safe time, reducing the closing threshold value of the electronic vacuum pump to a third preset closing value of the electronic vacuum pump, if the vacuum degree signal reaches the third preset closing value, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to continue working; if the vacuum degree signal does not reach the third preset closing value and the continuous working time reaches the third preset safe time, reducing the closing threshold value of the electronic vacuum pump to a fourth preset closing value of the electronic vacuum pump, if the vacuum degree signal reaches the fourth preset closing value, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to stop working and starting the engine working mode; the first preset closing value, the second preset closing value, the third preset closing value and the fourth preset closing value are sequentially reduced, and the first preset safety time, the second preset safety time, the third preset safety time and the fourth preset safety time are sequentially increased.

Further, the vacuum pump control method of the hybrid electric vehicle further comprises the step of controlling the electronic vacuum pump to perform self-checking while controlling the electronic vacuum pump to stop working.

Further, the controlling the electronic vacuum pump to perform self-test includes: setting the pedal stroke to be 0, if the electronic vacuum pump works, judging whether a vacuum degree signal meets the first preset closing value or whether the interval preset self-checking times reach the electronic first preset closing value within set time, if so, recording a current fault code as a historical fault code, otherwise, recording the current fault code, and controlling a vehicle instrument to perform brake fault alarm.

Compared with the prior art, the vacuum pump control method of the hybrid electric vehicle has the following advantages: the method provided by the embodiment of the invention is suitable for hybrid vehicles, reduces the excessive dependence of the overload working capacity of the electronic vacuum pump by adding the protection strategy mode of the electronic vacuum pump, protects the electronic vacuum pump from being burnt due to overload work, and improves the active safety of the braking performance of the whole vehicle.

Another object of the present invention is to propose a machine readable storage medium to at least partially solve the above technical problem.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a machine-readable storage medium having stored thereon instructions for causing a controller to execute the above-described vacuum pump control method of a hybrid vehicle.

The machine-readable storage medium has the same advantages as the vacuum pump control method of the hybrid electric vehicle compared with the prior art, and is not described herein again.

Another object of the present invention is to provide a vacuum pump control device for a hybrid vehicle, which at least partially solves the above technical problems.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the utility model provides a vacuum pump control device of hybrid vehicle, the vacuum pump include respectively to the vacuum booster of hybrid vehicle provides the electronic vacuum pump and the mechanical vacuum pump of the vacuum source of the same way, just the vacuum pump control device of hybrid vehicle includes: the signal acquisition module is used for acquiring a vacuum degree signal in the vacuum booster in real time; the first control module is used for controlling the electronic vacuum pump to stop working when the vacuum degree signal is higher than a first preset closing value of the electronic vacuum pump, otherwise, controlling the electronic vacuum pump to continuously work, and recording the continuous working time of the electronic vacuum pump in real time; the second control module is used for detecting whether an electronic vacuum pump working signal exists or not when the hybrid electric vehicle runs in an engine working mode, if so, controlling the electronic vacuum pump to continuously work, and otherwise, controlling the electronic vacuum pump to stop working; and the third control module is used for working as when the hybrid electric vehicle runs under a pure electric working mode, if the vacuum degree signal does not reach the first preset closing value, the continuous working time reaches the safe working time of the electronic vacuum pump, the first preset closing value is reduced to judge again whether the vacuum degree signal reaches the closing value after reduction, if so, the electronic vacuum pump is controlled to stop working, otherwise, the electronic vacuum pump is controlled to continue working or start the engine working mode.

Further, the third control module specifically includes: the first control sub-module is used for reducing the closing threshold value of the electronic vacuum pump to a second preset closing value of the electronic vacuum pump when the vacuum degree signal does not reach the first preset closing value and the continuous working time reaches a first preset safe time, controlling the electronic vacuum pump to stop working if the vacuum degree signal reaches the second preset closing value, and otherwise controlling the electronic vacuum pump to continue working; the second control sub-module is used for reducing the closing threshold value of the electronic vacuum pump to a third preset closing value of the electronic vacuum pump when the vacuum degree signal does not reach the second preset closing value and the continuous working time reaches a second preset safe time, and controlling the electronic vacuum pump to stop working if the vacuum degree signal reaches the third preset closing value, otherwise, controlling the electronic vacuum pump to continue working; the third control sub-module is used for reducing the closing threshold value of the electronic vacuum pump to a fourth preset closing value of the electronic vacuum pump when the vacuum degree signal does not reach the third preset closing value and the continuous working time reaches a third preset safe time, if the vacuum degree signal reaches the fourth preset closing value, the electronic vacuum pump is controlled to stop working, and if the vacuum degree signal does not reach the fourth preset closing value, the electronic vacuum pump is controlled to stop working and the engine working mode is started; the first preset closing value, the second preset closing value, the third preset closing value and the fourth preset closing value are sequentially reduced, and the first preset safety time, the second preset safety time, the third preset safety time and the fourth preset safety time are sequentially increased.

Further, the vacuum pump control device of the hybrid electric vehicle further includes: and the self-checking module is used for controlling the electronic vacuum pump to perform self-checking while controlling the electronic vacuum pump to stop working.

Further, the self-checking module controls the electronic vacuum pump to perform self-checking, including: setting the pedal stroke to be 0, if the electronic vacuum pump works, judging whether a vacuum degree signal meets the first preset closing value or whether the interval preset self-checking times reach the electronic first preset closing value within set time, if so, recording a current fault code as a historical fault code, otherwise, recording the current fault code, and controlling a vehicle instrument to perform brake fault alarm.

Compared with the prior art, the vacuum pump control device of the hybrid electric vehicle and the vacuum pump control method of the hybrid electric vehicle have the same advantages, and are not repeated herein.

Another object of the present invention is to provide a vacuum pump control system for a hybrid vehicle, which at least partially solves the above technical problems.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a vacuum pump control system for a hybrid vehicle, comprising: an electronic vacuum pump; a mechanical vacuum pump; the vacuum booster is respectively connected with the electronic vacuum pump and the mechanical vacuum pump through vacuum pipelines; the vacuum degree sensor is matched with the vacuum booster for mounting and is used for acquiring a vacuum degree signal in the vacuum booster; and the vacuum pump control device of the hybrid electric vehicle is electrically connected with the electronic vacuum pump and the vacuum degree sensor and is used for controlling the electronic vacuum pump according to the vacuum degree signal.

Compared with the prior art, the vacuum pump control system of the hybrid electric vehicle and the vacuum pump control method of the hybrid electric vehicle have the same advantages, and are not described herein again.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic flow chart illustrating a method for controlling a vacuum pump of a hybrid vehicle according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart illustrating the third control step performed in the preferred embodiment of the present invention;

3A-3B are schematic diagrams of the working principle of the electronic vacuum pump adopting the vacuum pump control method of the hybrid electric vehicle according to the embodiment of the invention, and the electronic vacuum pump comprises a normal working area and a strategy protection area;

fig. 4 is a schematic structural diagram of a vacuum pump control apparatus of a hybrid vehicle according to an embodiment of the present invention; and

fig. 5 is a schematic structural diagram of a vacuum pump control system of a hybrid vehicle according to an embodiment of the present invention.

Description of reference numerals:

410. an acquisition module; 420. A first control module;

430. a second control module; 440. A third control module;

450. a self-checking module; 510. An electronic vacuum pump;

520. a mechanical vacuum pump; 530. A vacuum booster;

540. a vacuum degree sensor; 550. And a vacuum pump control device.

Detailed Description

In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

In embodiments of the present invention, "electrically connected" is used to describe signal connections, such as control signals and feedback signals, between two components, as well as electrical power connections between two components. In addition, the "connection" related in the embodiments of the present invention may be a wired connection, a wireless connection, or a mechanical connection, and the "electrical connection" related in the embodiments of the present invention may be a direct electrical connection between two components, or an indirect electrical connection through other components.

In addition, in the embodiment of the present invention, the vacuum degree signal is a negative pressure value, and for convenience of understanding, when the magnitude comparison and the comparative descriptions such as "decrease", "increase", "exceed", "higher", and the like of the vacuum degree signal are referred to herein, the absolute value thereof is described instead of an actual value, for example, P1> P2 means that the absolute value of P1 is greater than the absolute value of P2.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1 is a schematic flow chart of a vacuum pump control method of a hybrid electric vehicle according to an embodiment of the present invention. As shown in fig. 1, the vacuum pump control method of the hybrid vehicle may include the steps of:

and S110 (namely a signal acquisition step), acquiring a vacuum degree signal in the vacuum booster in real time.

For example, a vacuum level signal within the vacuum booster may be collected by a sensor.

And S120 (namely a first control step), when the vacuum degree signal is higher than a first preset closing value of the electronic vacuum pump, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to continuously work, and recording the continuous working time of the electronic vacuum pump in real time.

The preset shutdown value may be understood as a shutdown threshold value of the electronic vacuum pump, and once the preset shutdown value is exceeded, the electronic vacuum pump should be stopped. For example, assuming that the first preset turn-off value of the electronic vacuum pump is P1, when the detected vacuum signal is higher than P1, the electronic vacuum pump stops working.

In addition, during the running of the hybrid electric vehicle, the on of the electronic vacuum pump can be controlled by a relay, and the relay can simultaneously accumulate the continuous working time of the electronic vacuum pump.

Step S130 (a second control step), when the hybrid electric vehicle is running in the engine operating mode, detecting whether an electronic vacuum pump operating signal exists, if so, controlling the electronic vacuum pump to continuously operate, otherwise, controlling the electronic vacuum pump to stop operating.

Step S140 (third control step), when the hybrid electric vehicle runs in a pure electric working mode, if the vacuum degree signal does not reach the first preset closing value and the continuous working time reaches the safe working time of the electronic vacuum pump, reducing the first preset closing value to judge whether the vacuum degree signal reaches the reduced closing value again, if so, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to continue working or starting the engine working mode.

The safe working time can be preset according to experience, and if the safe working time exceeds the safe working time, the electronic vacuum pump may be overloaded due to the leakage of a vacuum system and the like, so that the safety risk exists. Here, the safe operating time may be, for example, a first preset safe time t 1.

In addition, because the hybrid electric vehicle has two basic modes of an engine working mode and a pure electric working mode, the embodiment of the invention designs control strategies aiming at the two modes respectively, and the control strategies are as follows:

1) under the engine working mode, when the brake is stepped on and the vacuum assistance is needed, the mechanical vacuum pump and the electronic vacuum pump provide the vacuum assistance together, a second control step is executed to read the working signal of the electronic vacuum pump, if the working signal exists, the electronic vacuum pump is controlled to work continuously, the vehicle runs normally, if the working signal does not exist, the electronic vacuum pump is controlled to stop working, and the self-checking of the electronic vacuum pump can be carried out.

2) In the pure electric operating mode, when the brake is stepped on, only the electronic vacuum pump provides vacuum assistance for the vacuum booster, and the third control step is correspondingly executed, and the specific details of the third control step will be described in detail below.

Fig. 2 is a schematic flow chart showing the third control step performed in the preferred embodiment of the present invention. As shown in fig. 2, in a preferred embodiment, the third controlling step specifically includes:

and S210, if the vacuum degree signal does not reach the first preset closing value and the continuous working time reaches the first preset safe time, reducing the closing threshold value of the electronic vacuum pump to a second preset closing value of the electronic vacuum pump, if the vacuum degree signal reaches the second preset closing value, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to continue working.

The first preset safe time is t1, the second preset close value is P2, and P2< P1. When the real-time detection vacuum degree signal is less than P1 and the real-time continuous working time of the electronic vacuum pump reaches t1, the closing threshold value of the electronic vacuum pump is reduced to P2, if the real-time vacuum degree signal reaches P2, the electronic vacuum pump is controlled to stop working, otherwise, the electronic vacuum pump can continue working.

And S220, if the vacuum degree signal does not reach the second preset closing value and the continuous working time reaches the second preset safe time, reducing the closing threshold value of the electronic vacuum pump to a third preset closing value of the electronic vacuum pump, if the vacuum degree signal reaches the third preset closing value, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to continue working.

Wherein the second preset safe time is t2, t2> t1, the third preset close value is P3, and P3< P2< P1. When the real-time detection vacuum degree signal is less than P2 and the real-time continuous working time of the electronic vacuum pump reaches t2, the closing threshold value of the electronic vacuum pump is reduced to P3, if the real-time vacuum degree signal reaches P3, the electronic vacuum pump is controlled to stop working, otherwise, the electronic vacuum pump can continue working.

And step S230, if the vacuum degree signal does not reach the third preset closing value and the continuous working time reaches the third preset safe time, reducing the closing threshold value of the electronic vacuum pump to a fourth preset closing value of the electronic vacuum pump, if the vacuum degree signal reaches the fourth preset closing value, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to stop working and starting the working mode of the engine.

The third preset safe time is t3, t3> t2> t1, the fourth preset closing value is P4, and P4< P3< P2< P1. When the real-time detected vacuum degree signal is less than P3 and the real-time continuous working time of the electronic vacuum pump reaches t3, the closing threshold value of the electronic vacuum pump is reduced to P4, if the real-time vacuum degree signal reaches P4, the electronic vacuum pump is controlled to stop working, and if not, the electronic vacuum pump is controlled to stop working and the engine working mode is started. It should be noted that t3 can be understood as the safety precaution time, that is, when the continuous operation time of the electronic vacuum pump reaches t3, it indicates that it is in the high risk operation state, and if the vacuum signal does not reach P4, the electronic vacuum pump should be immediately stopped, and the engine operation mode is started to enable the mechanical vacuum pump to provide the vacuum assistance.

And step 150 (not shown in fig. 1), controlling the electronic vacuum pump to perform self-test while controlling the electronic vacuum pump to stop working.

Specifically, controlling the electronic vacuum pump to perform self-checking may be performed after the entire vehicle is reinitialized, and may include: setting the pedal stroke to be 0, if the electronic vacuum pump works, judging whether a vacuum degree signal meets the first preset closing value or whether the interval preset self-checking times reach the electronic first preset closing value within set time, if so, recording a current fault code as a historical fault code, otherwise, recording the current fault code, and controlling a vehicle instrument to perform brake fault alarm.

For example, the whole vehicle is reinitialized, self-checking is carried out through the controller, the pedal stroke is 0, if the electronic vacuum pump works and the vacuum degree signal t0 is detected to meet a preset closing value within time, a fault code is recorded as a historical fault code, the fault is automatically eliminated, and when the pedal is stepped on, the electronic vacuum pump works according to a normal working strategy; the pedal stroke is 0, if the electronic vacuum pump works, the closing value is not met within the time of detecting the vacuum degree signal t0 or the interval N times reaches the preset closing threshold value, the current fault code is recorded, and the instrument prompts the fault signal of the electronic vacuum pump to remind a driver and passengers of checking the vehicle condition. Wherein t0 is a set time corresponding to a preset closing value in the performance curve of the electronic vacuum pump, and N is a preset self-checking number of times of the controller.

In addition, the control of the vehicle instrument for brake failure alarm CAN be realized by transmitting an alarm signal through the CAN network, for example, voice reminding is carried out to remind a driver to carry out vehicle inspection.

The embodiment of the invention also provides a machine-readable storage medium, wherein the machine-readable storage medium is stored with instructions, and the instructions are used for enabling a controller to execute the vacuum pump control method of the hybrid electric vehicle described in the embodiment.

Accordingly, it can be seen that the embodiment of the present invention can implement the control of the electronic vacuum pump by using a controller, which is an independent controller such as a single chip microcomputer and a digital signal processor, or an ECU (electronic control Unit) of a vehicle. Taking the ECU as an example, it CAN obtain the vacuum degree signal of the vehicle through the entire vehicle CAN network.

Fig. 3A to 3B are schematic diagrams illustrating the operation principle of a vacuum pump using the vacuum pump control method for a hybrid vehicle according to an embodiment of the present invention, which respectively correspond to two operating regions, that is: a normal working area and a policy protection area. These two operating regions will be described in detail below.

First, normal working area

Referring to fig. 3A, the normal operating region mainly includes the following steps:

and step S311, starting and initializing the whole vehicle.

After the whole vehicle is started and initialized, the electronic vacuum pump and the like can be subjected to self-checking so as to ensure normal operation of the electronic vacuum pump and the like.

In step S312, the vacuum sensor detects a vacuum signal.

In step S313, the controller receives the vacuum level signal.

In step S314, it is determined whether the vacuum signal is higher than the first preset close value P1, or step S315 is executed, otherwise step S316 is executed.

And step S315, controlling the electronic vacuum pump to stop working.

And step S316, the electronic vacuum pump continues to work and enters a strategy protection area.

Second, strategy protection area

Referring to fig. 3B, the policy protected area mainly includes the following steps:

step S321, receiving the working condition of the normal working area, and determining the vehicle driving mode.

Step S322, detecting whether an electronic vacuum pump working signal exists or not in the engine working mode, if so, controlling the electronic vacuum pump to continuously work, otherwise, controlling the electronic vacuum pump to stop working.

Step S323, in the pure electric working mode, when the continuous working time of the electronic vacuum pump exceeds a first preset safe time t1, reducing the closing threshold value of the electronic vacuum pump to a second preset closing value P2 of the electronic vacuum pump.

In step S324, it is determined whether the vacuum degree signal reaches a second preset closing value P2, if so, the electronic vacuum pump is controlled to stop working, otherwise, the electronic vacuum pump is controlled to continue working, and step S325 is executed.

In step S325, when the continuous working time of the electronic vacuum pump exceeds a second preset safe time t2, the turn-off threshold of the electronic vacuum pump is decreased to a third preset turn-off value P3 of the electronic vacuum pump.

Step S326, determining whether the vacuum signal reaches a third preset closing value P3, if so, controlling the electronic vacuum pump to stop working, otherwise, controlling the electronic vacuum pump to continue working, and performing step S327.

Step S327, when the continuous working time of the electronic vacuum pump exceeds a third preset safe time t3, decreasing the shutdown threshold of the electronic vacuum pump to a fourth preset shutdown value P4 of the electronic vacuum pump.

Step S328, determining whether the vacuum signal reaches a fourth preset closing value P4, if so, controlling the electronic vacuum pump to stop working, otherwise, executing step S329.

And step S329, controlling the electronic vacuum pump to stop working and starting the working mode of the engine.

Specifically, when the vacuum degree signal does not reach the fourth preset closing value P4, the controller intervenes once more, the engine is started by force, the driving mode is switched to the non-pure electric mode automatically, the electronic vacuum pump does not work any more at the moment, the mechanical vacuum pump provides vacuum assistance for the vacuum booster, and braking fault alarming is carried out through a vehicle instrument so as to remind a driver to carry out vehicle inspection.

The first preset closing value P1, the second preset closing value P2, the third preset closing value P3 and the fourth preset closing value P4 are sequentially reduced, the first preset safety time t1, the second preset safety time t2, the third preset safety time t3 and the fourth preset safety time t4 are accumulated working time and sequentially increased. And the sizes of P1-P4 and t1-t3 can be determined according to the parameter configuration of the electronic vacuum pump obtained by the manufacturer of the electronic vacuum pump through current surge experiments and the like.

In conclusion, the embodiment of the invention is suitable for hybrid vehicles, reduces the excessive dependence on the overload working capacity of the electronic vacuum pump by adding the protection strategy mode of the electronic vacuum pump, protects the electronic vacuum pump from being burnt due to overload work, and improves the active safety of the braking performance of the whole vehicle.

Based on the same invention idea, the embodiment of the invention also provides a vacuum pump control device of the hybrid electric vehicle.

Fig. 4 is a schematic structural diagram of a vacuum pump control device of a hybrid vehicle according to an embodiment of the present invention. As shown in fig. 4, the vacuum pump control apparatus of the hybrid vehicle may include: a signal acquisition module 410, configured to acquire a vacuum degree signal in the vacuum booster in real time; the first control module 420 is configured to control the electronic vacuum pump to stop working when the vacuum degree signal is higher than a first preset closing value of the electronic vacuum pump, and otherwise, control the electronic vacuum pump to continuously work and record the continuous working time of the electronic vacuum pump in real time; the second control module 430 is configured to detect whether an electronic vacuum pump working signal exists when the hybrid electric vehicle runs in an engine working mode, control the electronic vacuum pump to continuously work if the electronic vacuum pump working signal exists, and control the electronic vacuum pump to stop working if the electronic vacuum pump working signal does not exist; and a third control module 440, configured to work as when the hybrid electric vehicle runs in the pure electric operating mode, if the vacuum degree signal does not reach the first preset closing value, and the continuous operating time reaches the safe operating time of the electronic vacuum pump, then reduce the first preset closing value to re-determine whether the vacuum degree signal reaches the closing value after reduction, if so, control the electronic vacuum pump to stop working, otherwise control the electronic vacuum pump to continue working or start the engine operating mode.

In a preferred embodiment, the vacuum pump control apparatus of a hybrid vehicle may further include: and the self-checking module 450 is configured to control the electronic vacuum pump to perform self-checking while controlling the electronic vacuum pump to stop working.

More preferably, the self-test module 450 is configured to control the electronic vacuum pump to perform self-test, and includes: setting the pedal stroke to be 0, if the electronic vacuum pump works, judging whether a vacuum degree signal meets the first preset closing value or whether the interval preset self-checking times reach the electronic first preset closing value within set time, if so, recording a current fault code as a historical fault code, otherwise, recording the current fault code, and controlling a vehicle instrument to perform brake fault alarm.

The vacuum pump control device of the hybrid electric vehicle according to the embodiment of the present invention has the same or similar implementation details and effects as those of the embodiment of the vacuum pump control method for the hybrid electric vehicle, and will not be described herein again.

Fig. 5 is a schematic structural diagram of a vacuum pump control system of a hybrid vehicle according to an embodiment of the present invention. As shown in fig. 5, the electronic vacuum pump control system may include: an electronic vacuum pump 510; a mechanical vacuum pump 520; a vacuum booster 530 connected to the electronic vacuum pump 510 and the mechanical vacuum pump 520 through vacuum lines, respectively; a vacuum degree sensor 540 installed in cooperation with the vacuum booster 530, for acquiring a vacuum degree signal in the vacuum booster 530; the vacuum pump control device 550 of the hybrid electric vehicle according to the above embodiment is electrically connected to the electronic vacuum pump 510 and the vacuum degree sensor 540, and is configured to control the electronic vacuum pump according to the vacuum degree signal.

It should be noted that the vacuum pump control system further includes a brake pedal 530, and the vacuum booster 530 is further connected to the brake pedal 530 to provide boosting force to the brake pedal. The cover may further include a pedal stroke sensor 550 installed in cooperation with the brake pedal 530 for collecting a pedal stroke signal to determine whether braking is performed. The vacuum booster is mechanically connected to the brake pedal, for example, by a pin.

It should be noted that, in addition to the electronic vacuum pump 510 and the mechanical vacuum pump 520, the electronic vacuum pump control system may further include another vacuum booster, and in this case, the vacuum degree signal should also include the vacuum degree signal provided by the other vacuum booster.

Here, for the vacuum pump control device 550 of the hybrid vehicle to control the electronic vacuum pump according to the vacuum degree signal, reference may be made to the above-mentioned embodiments of the vacuum pump control method of the hybrid vehicle, and details thereof are not repeated herein.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents, improvements, etc., such as an adaptive change of the execution sequence of the steps, which are within the spirit and principle of the present invention, should be included in the protection scope of the present invention.

Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

In addition, various different embodiments of the present invention may be combined arbitrarily, and as long as the idea of the embodiments of the present invention is not violated, the same should be regarded as the disclosure of the embodiments of the present invention.