CN110588619B - Control method of electric automobile vacuum pump in plateau environment - Google Patents
Control method of electric automobile vacuum pump in plateau environment Download PDFInfo
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- CN110588619B CN110588619B CN201910831701.2A CN201910831701A CN110588619B CN 110588619 B CN110588619 B CN 110588619B CN 201910831701 A CN201910831701 A CN 201910831701A CN 110588619 B CN110588619 B CN 110588619B
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- vacuum pump
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/02—Arrangements of pumps or compressors, or control devices therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a control method of an electric automobile vacuum pump in a plateau environment. The process is as follows: and detecting the pressure of the vacuum pump in real time in an ignition state, judging whether the vacuum pump is started or not according to the pressure of the vacuum pump, and judging whether the vacuum pump stops working or enters a fault working mode when braking is executed according to the pressure of the vacuum pump after the vacuum pump is started and works for a certain time. According to the method, the atmospheric pressure in the plateau environment and the parameters of the vacuum pump system are combined, the reasonable opening threshold and the reasonable closing threshold in the plateau environment are calibrated, and finally, the scheme without the atmospheric pressure sensor is realized, so that the optimal control of the vacuum pump in the plateau environment is met, the damage and the complaint of customers caused by long-time work of the vacuum pump are reduced, the situations such as accidents are avoided, and the investment cost of the atmospheric pressure sensor is saved.
Description
Technical Field
The invention belongs to the technical field of automobile control, and particularly relates to a control method of an electric automobile vacuum pump in a plateau environment.
Background
In the new energy automobile industry, most of whole automobiles need to be vacuumized by using a vacuum pump to realize brake assistance, and the most common control mode for vacuumizing the vacuum pump at present is to control opening and closing by combining a pressure point of a vacuum tank and then perform fault treatment on abnormal working conditions; and a part of the system also uses an atmospheric pressure sensor for monitoring and controlling the opening and closing of the vacuum pump.
The control method without the atmospheric pressure sensor has the following defects: under normal atmospheric pressure environment, control is more reasonable, but does not consider the operating mode under the plateau environment, can lead to the vacuum pump to take out to close the threshold value all the time under this environment, appears that the long-time work of vacuum pump leads to burning out, perhaps the helping hand is not enough, leads to effectual brake, can cause the customer to complain even the accident appears.
The control method with the atmospheric pressure sensor has the following defects: the cost of the whole vehicle is increased, and the fault points of the whole vehicle are increased.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provides a control method of an electric automobile vacuum pump in a plateau environment.
The technical scheme adopted by the invention is as follows: a control method of an electric automobile vacuum pump in a plateau environment comprises the steps of detecting the pressure of the vacuum pump in real time in an ignition state, judging whether the vacuum pump is started or not according to the pressure of the vacuum pump, judging whether the vacuum pump stops working or enters a fault working mode when the vacuum pump is stepped on to brake after the vacuum pump is started and works for a certain time.
And further, when the pressure of the vacuum pump is detected to be smaller than a first set value, the vacuum pump relay is controlled to enable, and the vacuum pump is started to work.
Further, when the pressure of the vacuum pump is detected to be larger than or equal to the first set value, the vacuum pump is not started, and the pressure of the vacuum pump is continuously detected.
Further, after the vacuum pump is started and works for a first set time, when the pressure of the vacuum pump is detected to be less than or equal to a third set value, the air leakage fault of the vacuum pump system is judged, the whole vehicle runs with limited power, and the vacuum pump enters a fault working mode when the stepping brake is executed.
Further, after the vacuum pump is started and works for a first set time, when the pressure of the vacuum pump is detected to be greater than a third set value and smaller than a second set value, the vacuum pump enters a fault working mode when braking is executed.
Further, after the vacuum pump is started and works for the first set time, when the pressure of the vacuum pump is detected to be larger than or equal to the second set value, the vacuum pump stops working.
Further, the failure mode of operation comprises the steps of:
step 1, stopping working after the vacuum pump works for a second set time;
step 2, judging whether the pressure of the vacuum pump is smaller than a second set value;
step 3, if the pressure is not less than a second set value, keeping vacuum and stopping working;
and 4, if the value is less than the second set value, returning to the step 1.
Furthermore, under the condition that the vacuum pump is not enabled and the braking signal is invalid, if the pressure drop value of the vacuum pump reaches a fourth set value within a third set time, the vacuum pump is judged to have a slow leakage fault, a slow leakage fault is prompted on the instrument, and the instrument is stopped after prompting the fourth set time.
The invention detects the pressure of the vacuum pump in real time under the automobile ignition state, judges whether to start the vacuum pump according to the pressure of the vacuum pump, and since the atmospheric pressure ratio is larger under the plateau environment, the vacuum pump can not be pumped to a closable threshold value, the invention marks a reasonable closing threshold value in the plateau environment and a pressure threshold value in a non-fault state under the plateau environment by strategy optimization control and combining the atmospheric pressure under the plateau environment and the parameters of the vacuum pump system, finally realizes the scheme without an atmospheric pressure sensor, meets the optimal control of the vacuum pump under the plateau environment, reduces the damage and the complaint of customers of the long-time work of the vacuum pump, avoids the conditions of accidents and the like, and saves the investment cost of the atmospheric pressure sensor.
Drawings
Fig. 1 is a control flowchart of the vacuum pump of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the present invention provides a method for controlling a vacuum pump of an electric vehicle in a plateau environment, in which a vehicle control unit detects a pressure (taking a positive value with respect to a standard atmospheric pressure value) of the vacuum pump in real time in an ignition state (i.e., an IGN ON shift state), determines whether to start the vacuum pump according to the pressure of the vacuum pump, and determines whether to stop working of the vacuum pump or enter a failure mode when the vacuum pump performs braking according to the pressure of the vacuum pump after the vacuum pump is started and works for a certain time.
In the above scheme, when detecting that the pressure of the vacuum pump is smaller than the first set value P1, the vehicle control unit outputs a vacuum pump enable signal to be effective, controls the vacuum pump relay to be closed, and starts the vacuum pump to work. When the vacuum pump pressure is detected to be greater than or equal to the first set value P1, the vacuum pump is not started, and the vacuum pump pressure is continuously detected.
In the above scheme, after the vacuum pump is started and operates for a first set time t1, t1 is 10-15s, when the pressure of the vacuum pump is detected to be less than or equal to a third set value P3, it is determined that the vacuum pump system leaks gas, at this time, the entire vehicle runs with limited power, the vacuum pump enters a failure operating mode when braking is performed, and the failure operating mode process is as follows: stopping working after the vacuum pump works for a second set time t2 when the brake is stepped, wherein t2 is 10-15s, and judging whether the pressure of the vacuum pump is smaller than a second set value or not; if the pressure is not less than the second set value, the vacuum is kept to stop working; if the pressure of the vacuum pump is smaller than the second set value, the vacuum pump continues to work for a second set time t2, and then the pressure of the vacuum pump is judged again until the pressure of the vacuum pump is not smaller than the second set value.
In the above scheme, after the vacuum pump is started and operates for the first set time t1, when it is detected that the vacuum pump pressure is greater than the third set value P3 and less than the second set value P2, it is determined that there is a possible air leakage fault in the vacuum pump system, the vacuum pump enters a fault working mode when the brake is stepped on, and the fault working mode process is as follows: stopping working after the vacuum pump works for a second set time t2 when braking is performed, and judging whether the pressure of the vacuum pump is smaller than a second set value or not; if the pressure is not less than the second set value, the vacuum is kept to stop working; if the pressure of the vacuum pump is smaller than the second set value, the vacuum pump continues to work for a second set time t2, and then the pressure of the vacuum pump is judged again until the pressure of the vacuum pump is not smaller than the second set value.
In the scheme, after the vacuum pump is started and works for the first set time t1, when the pressure of the vacuum pump is detected to be greater than or equal to the second set value P2, the vehicle control unit outputs the enabling signal of the vacuum pump to be invalid, the relay of the vacuum pump is controlled to be disconnected, and the vacuum pump stops working.
In the scheme, under the condition that the vacuum pump is not enabled and the braking signal is invalid, if the t3 is 5-10s within the third set time t3 and the pressure drop value of the vacuum pump reaches the fourth set value P4, the vacuum pump slow leakage fault is judged, the vehicle control unit detects the vacuum pump fault, the vacuum pump fault state signal is sent to the instrument through the CAN signal, the slow leakage fault display is carried out on the instrument to prompt a driver, the instrument stops after displaying the fourth set time t4, the t4 is 5-10s, and the fault is continuously judged. The pressure set values are determined according to actual requirements.
Those not described in detail in this specification are within the skill of the art.
Claims (5)
1. A control method of an electric automobile vacuum pump in a plateau environment is characterized by comprising the following steps: detecting the pressure of a vacuum pump in real time in an ignition state, judging whether the vacuum pump is started or not according to the pressure of the vacuum pump, and judging whether the vacuum pump stops working or enters a fault working mode when braking is executed according to the pressure of the vacuum pump after the vacuum pump is started and works for a certain time; after the vacuum pump is started and works for a first set time, when the pressure of the vacuum pump is detected to be greater than a third set value and smaller than a second set value, the vacuum pump enters a fault working mode when braking is executed; after the vacuum pump is started and works for a first set time, when the pressure of the vacuum pump is detected to be less than or equal to a third set value, the air leakage fault of a vacuum pump system is judged, the whole vehicle runs with limited power, and the vacuum pump enters a fault working mode when braking is executed;
and under the conditions that the vacuum pump is not enabled and the braking signal is invalid, if the pressure drop value of the vacuum pump reaches a fourth set value within a third set time, determining that the vacuum pump has a slow leakage fault, prompting the slow leakage fault on the instrument, and stopping after the instrument prompts the fourth set time.
2. The control method of the vacuum pump of the electric automobile in the plateau environment as claimed in claim 1, wherein: and when the pressure of the vacuum pump is detected to be smaller than a first set value, controlling the vacuum pump relay to enable, and starting the vacuum pump to work.
3. The control method of the vacuum pump of the electric automobile in the plateau environment as claimed in claim 1, wherein: and when the pressure of the vacuum pump is detected to be more than or equal to the first set value, the vacuum pump is not started, and the pressure of the vacuum pump is continuously detected.
4. The control method of the vacuum pump of the electric automobile in the plateau environment as claimed in claim 1, wherein: and after the vacuum pump is started and works for the first set time, when the pressure of the vacuum pump is detected to be greater than or equal to the second set value, the vacuum pump stops working.
5. The control method of the vacuum pump of the electric automobile in the plateau environment as claimed in claim 1, wherein: the failure mode of operation comprises the steps of:
step 1, stopping working after the vacuum pump works for a second set time;
step 2, judging whether the pressure of the vacuum pump is smaller than a second set value;
step 3, if the pressure is not less than a second set value, keeping vacuum and stopping working;
and 4, if the value is less than the second set value, returning to the step 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910831701.2A CN110588619B (en) | 2019-09-04 | 2019-09-04 | Control method of electric automobile vacuum pump in plateau environment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910831701.2A CN110588619B (en) | 2019-09-04 | 2019-09-04 | Control method of electric automobile vacuum pump in plateau environment |
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| CN110588619A CN110588619A (en) | 2019-12-20 |
| CN110588619B true CN110588619B (en) | 2021-06-01 |
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| CN201910831701.2A Active CN110588619B (en) | 2019-09-04 | 2019-09-04 | Control method of electric automobile vacuum pump in plateau environment |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113044018B (en) * | 2019-12-27 | 2023-11-14 | 观致汽车有限公司 | Control method of vacuum pump and electric automobile |
| CN112896129B (en) * | 2020-05-07 | 2022-12-09 | 重庆长安汽车股份有限公司 | Control method for electronic vacuum pump of pure electric vehicle |
| CN112721892B (en) * | 2020-12-30 | 2022-03-01 | 浙江合众新能源汽车有限公司 | Plateau control method for vacuum system of new energy electric vehicle |
| CN113147718A (en) * | 2021-06-08 | 2021-07-23 | 奇瑞商用车（安徽）有限公司 | Diagnosis control method and system for working state of vacuum pump |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2040054U (en) * | 1988-05-13 | 1989-06-28 | 沈阳飞机制造公司 | Vacuum force-assistant plateau brake device for motor car |
| CN105235669A (en) * | 2015-10-30 | 2016-01-13 | 北京新能源汽车股份有限公司 | Brake boosting control system, control method thereof and vehicle |
| CN205573931U (en) * | 2016-03-25 | 2016-09-14 | 宝沃汽车（中国）有限公司 | Vacuum pump failure diagnosis processing system and vehicle that has this system |
| CN106080565A (en) * | 2016-07-06 | 2016-11-09 | 北京长安汽车工程技术研究有限责任公司 | The control method of a kind of pure electric vehicle vacuum boost system and device |
| CN106379303B (en) * | 2016-10-26 | 2019-04-09 | 浙江吉利控股集团有限公司 | A kind of Vehicular electric vacuum pump control system and its method |
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Address after: 430056 No.5 workshop, No.339, zhuanyang Avenue, Wuhan Economic and Technological Development Zone, Hubei Province Patentee after: Zhixin Control System Co.,Ltd. Address before: 430056 No. 5 Workshop, 339 Chaoyang Avenue, Wuhan Economic and Technological Development Zone, Wuhan City, Hubei Province Patentee before: DONGFENG HANGSHENG (WUHAN) AUTOMOTIVE CONTROL SYSTEM Co.,Ltd. |