CN110979283A - Control method of vacuum boosting system and storage medium - Google Patents
Control method of vacuum boosting system and storage medium Download PDFInfo
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- CN110979283A CN110979283A CN201911357432.7A CN201911357432A CN110979283A CN 110979283 A CN110979283 A CN 110979283A CN 201911357432 A CN201911357432 A CN 201911357432A CN 110979283 A CN110979283 A CN 110979283A
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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
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/72—Electrical control in fluid-pressure brake systems in vacuum systems or 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
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Engineering & Computer Science (AREA)
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Abstract
The invention provides a control method and a storage medium of a vacuum boosting system, wherein the vacuum boosting system acquires a vacuum pressure value in the system, then sequentially judges whether the vacuum pressure value reaches a first preset threshold value and a second preset threshold value, after the vacuum pressure value reaches the second preset threshold value, a vacuum pump enters a self-learning mode, the saturation of the vacuum pressure value is detected according to the state of a brake pedal and the pressure difference value of the vacuum pressure value in unit time, the second preset threshold value of the vacuum pump is acquired, and the current first preset threshold value of the vacuum pump is acquired by inquiring a corresponding relation table of the first/second preset threshold values of the vacuum pump. According to the invention, the learning mode of the preset threshold is automatically adjusted by the power-assisted system so as to detect the saturation of the vacuum power-assisted system in real time, and seamless connection from low altitude to altitude and from high altitude to low altitude is effectively realized. On the premise of realizing cost reduction, the problem that the vacuum boosting system cannot reach a preset value due to trace air leakage and other causes is solved.
Description
Technical Field
The invention belongs to the technical field of electric vehicle control, and particularly relates to a control method and a storage medium of a vacuum boosting system.
Background
With the development of social economy, the pollution emission of the new energy automobile is reduced due to the use of clean energy, the concept of green travel is met, and more people select the new energy automobile as a travel tool. While the domestic new energy automobile industry develops high enthusiasm, under the trend that the subsidies of the nation for new energy automobiles are gradually reduced, how to reduce the production cost becomes a new problem facing various large host plants under the current environment.
The vacuum booster system is generally adopted by the conventional electric automobile and comprises a vacuum pump, a vacuum tank, a vacuum booster, a vacuum pipeline and an atmospheric pressure sensor, wherein the vacuum pump is used for providing a vacuum source for the vacuum booster system and is connected to the vacuum booster and the vacuum tank through the vacuum pipeline, and the atmospheric pressure sensor is used for providing an atmospheric pressure reference value for a control unit. In the prior art, referring to fig. 1, a block diagram of a vacuum boosting system is provided, in which a vacuum pressure sensor is disposed in a vacuum tank or a vacuum pipeline for detecting vacuum pressure in the vacuum tank in real time, an atmospheric pressure sensor inputs a current atmospheric pressure value to a control unit in real time, and the control unit sets first/second preset thresholds of different vacuum pumps according to the atmospheric pressure value. If the barometric pressure sensor fails, the common process is to default to the standard barometric pressure value, i.e.: when the atmospheric pressure sensor breaks down, the altitude of the vehicle changes, the vacuum pump can work all the time to reduce the service life and then burn out, or the boosting system provided by the vacuum pump is insufficient, so that traffic accidents occur. Therefore, in order to avoid a series of problems caused by the faults of the atmospheric pressure sensor and simultaneously realize cost reduction, the design of the electric vacuum power-assisted system control system without the atmospheric pressure value signal is very important.
Therefore, it is necessary to develop a control method and a storage medium for a vacuum assist system.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a control method and a storage medium for a vacuum assist system, which are used to solve the problem that the vacuum assist system is susceptible to an atmospheric pressure sensor to cause damage to an automobile and reduce the production cost.
In a first aspect, the present invention provides a control method for a vacuum assist system, including: acquiring a vacuum pressure value of the current vacuum boosting system; judging whether the vacuum pressure value reaches a first preset threshold value, if the vacuum pressure value does not reach the first preset threshold value, stopping the vacuum pump, if the vacuum pressure value reaches the first preset threshold value, continuing to work by the vacuum pump, and judging whether the vacuum pressure value reaches a second preset threshold value; if the vacuum pressure value reaches the second preset threshold value, the vacuum pump continues to work and enters a preset threshold value self-learning mode, and if the vacuum pressure value does not reach the second preset threshold value, whether a first pressure difference value of the vacuum boosting system in unit time is smaller than a first preset vacuum pressure difference value P1 is detected; if the first pressure difference value of the vacuum boosting system in unit time is smaller than a first preset pressure difference value P1, the vacuum pump continues to work and enters the preset threshold self-learning mode, and if the first pressure difference value is larger than or equal to a first preset pressure value P1, the vacuum pump continues to work, and the current vacuum pressure value of the vacuum boosting system is obtained again and compared with the second preset threshold.
Further, the preset threshold self-learning mode specifically comprises the following steps: judging whether the brake pedal is stepped down; if the brake pedal is stepped on, exiting the preset threshold self-learning mode; if the brake pedal is not stepped on, judging whether a detected second pressure difference value of the current vacuum boosting system in unit time is smaller than a second preset pressure difference value P2, if the second pressure difference value is larger than or equal to the second preset pressure difference value P2, judging whether the brake pedal is stepped on again, and if the second pressure difference value is smaller than the second preset pressure difference value P2, judging whether the duration time of the second pressure difference value in unit time reaches a preset time T1; if the duration of the second pressure difference value does not reach the preset time T1, ending the preset threshold self-learning mode, and if the duration of the second pressure difference value reaches the preset time T1, taking the current vacuum pressure value as a second preset threshold; after the second preset threshold is obtained, the first preset threshold is obtained by inquiring the corresponding relation table of the first preset threshold and the second preset threshold of the vacuum pump, and the self-learning mode of the preset threshold is exited.
In a second aspect, the present invention further provides a storage medium having a computer program stored therein, the computer program being invoked by a controller to perform the steps of any of the vacuum assist system based control methods.
The invention brings the following beneficial effects:
the invention provides a control method and a storage medium of a vacuum boosting system, wherein the vacuum boosting system firstly obtains a vacuum pressure value of the current vacuum boosting system, then judges whether the vacuum pressure value reaches a first preset threshold value and a second preset threshold value, after the vacuum pressure value reaches the second preset threshold value, a vacuum pump enters a self-learning mode, the saturation of the vacuum pressure value is detected according to the state of a brake pedal and the pressure difference value of the vacuum boosting system in unit time, the second preset threshold value of the vacuum pump is obtained, and the first preset threshold value of the vacuum pump is obtained by inquiring a corresponding relation table of the second/first preset threshold values of the vacuum pump. The learning mode of the preset threshold is adjusted through the power assisting system in a self-learning mode continuously, so that the aim of detecting the saturation of the vacuum power assisting system in real time is fulfilled. A large number of experiments prove that the control system can effectively realize seamless connection from low altitude to altitude and from high altitude to low altitude. Because an atmospheric pressure sensor is not used any more, the production cost is reduced, the problems that the vacuum boosting system leaks gas in a trace amount and the vacuum degree cannot reach a preset value due to other reasons are solved, the system robustness is effectively improved, and the driving feeling of the electric automobile can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a prior art vacuum assist system;
FIG. 2 is a schematic view of a vacuum assist system of the present invention;
FIG. 3 is a flow chart of a method of controlling a vacuum assist system of the present invention;
FIG. 4 is a flow chart of the preset threshold self-learning mode of the present invention;
FIG. 5 is a table showing the relationship between the first and second predetermined thresholds of the vacuum pump according to the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The present embodiment provides a block diagram of a vacuum boosting system, as shown in fig. 2, a pressure sensor 2 is disposed in a vacuum tank or a vacuum pipeline for detecting vacuum pressure in the vacuum tank in real time, and a control unit 3 then controls a vacuum pump 1 to be turned on/off according to a pressure value fed back by the pressure sensor 2.
Referring to fig. 3, a control method of a vacuum assist system provided in this embodiment includes the following specific steps:
step S401, start to work, that is, the electric vehicle controller starts to acquire the vacuum pressure value of the current vacuum boosting system.
Step S402, judging whether the current vacuum pressure value reaches a first preset threshold value, namely judging whether the current vacuum pressure value obtained by the vacuum pressure sensor reaches the first preset threshold value preset by the system, judging whether the current first vacuum pressure value reaches the first preset threshold value, if not, executing S407 by the vacuum pump, and if so, entering S403.
In step S403, after the control unit controls the vacuum pump to continue operating, step S404 is executed.
Step S404, judging whether the current vacuum pressure value reaches a second preset threshold value, continuously judging with a second preset threshold value preset in advance by the system according to the current vacuum pressure value obtained by the vacuum pressure sensor, if the vacuum pressure value reaches the second preset threshold value, continuing to work by the vacuum pump and entering step S405, and if the vacuum pressure value does not reach the second preset threshold value, executing step S406.
And S405, enabling the vacuum boosting system to enter a preset threshold self-learning mode.
Step S406, the vacuum pump continues to operate, and simultaneously detects whether a first pressure difference of the vacuum boosting system in unit time is smaller than a first preset pressure difference P1, if the first pressure difference is smaller than the first preset pressure difference P1, step S405 is performed, and if the first pressure difference is greater than or equal to the first preset pressure difference P1, the vacuum pump continues to operate, and the current vacuum pressure value of the vacuum boosting system is obtained again and compared with the second preset threshold value, that is, step S403 is performed again.
Step S407 indicates that the vacuum pump stops operating.
The preset threshold self-learning mode refers to that the vacuum boosting system can automatically adjust a first preset threshold and a second preset threshold which are preset by the system according to different altitudes of the automobile, a driver does not need to manually adjust the threshold on an operation platform according to the local altitude, and safe driving of the electric automobile can be guaranteed.
When the vacuum boosting system starts to work, if the current vacuum pressure value is judged to reach a first preset threshold value, the vacuum pump is controlled to work, meanwhile, whether the vacuum pressure value reaches a second preset threshold value is judged, and if yes, a self-learning mode of the vacuum pump preset value is entered; if not, detecting whether the change rate of the vacuum pressure value (namely, the vacuum pressure difference value) of the vacuum boosting system in unit time is smaller than a first preset pressure difference value P1, if the detected vacuum pressure difference value is smaller than or equal to the first preset pressure difference value P1, entering a self-learning mode with a preset threshold value of the vacuum pump, and if the detected vacuum pressure difference value is larger than the first preset pressure difference value P1, continuing to control the vacuum pump to work until the vacuum boosting system finishes the self-learning mode, and controlling the vacuum pump to stop working.
When the vacuum boosting system enters a vacuum preset threshold value self-learning mode, as shown in fig. 4, the specific steps include:
s501, starting to enter a self-learning mode with a vacuum preset threshold value.
S502, judging whether the brake pedal is pressed down or not according to the brake pedal signal, if so, entering S507, otherwise, executing 503.
S503, judging whether the detected second pressure difference value of the current vacuum boosting system in unit time is smaller than a second preset pressure difference value P2, if the second pressure difference value is larger than or equal to the second preset pressure value P2, continuously judging whether the brake pedal is pressed down, namely, returning to the step S502 for judging again.
In step S504, if the second pressure difference value in S503 is smaller than the second preset pressure difference value P2, it is further determined whether the duration of the second pressure difference value reaches a preset time T1, if the duration reaches a preset time T1, the process proceeds to step S505, otherwise, the process proceeds to step S507.
In step S505, the control unit records that the current vacuum third pressure value is P3, and if the atmospheric pressure sensor detects that the third pressure difference value of the vacuum boosting system in unit time is smaller than the second preset pressure difference value P2, the current third vacuum pressure value is the second preset threshold value.
In step S506, the control unit queries, according to the second preset threshold, a corresponding relationship table between the first preset threshold and the second preset threshold of the vacuum pump, for obtaining the first preset threshold, that is, after obtaining the second preset threshold in step S505, the control unit queries and sets the first preset threshold according to the corresponding relationship table between the first preset threshold and the second preset threshold of the vacuum pump, where the corresponding relationship table is as shown in fig. 5.
Step S507, the work flow is ended.
In the vacuum pump preset threshold value self-learning mode, the power-assisted system is used for detecting the saturation of the vacuum pressure value according to the pedal state and the vacuum pressure value change rate, and then enters the preset threshold value self-learning mode to obtain a second preset threshold value of the vacuum pump. And simultaneously, according to the second preset threshold, inquiring a corresponding relation table of the first preset threshold and the second preset threshold of the vacuum pump to obtain the first preset threshold of the vacuum pump.
It should be noted that the corresponding relation table of the first preset threshold and the second preset threshold of the vacuum pump is obtained by multiple experiments in a laboratory by an experimenter, the first preset threshold of the vacuum pump linearly changes with the increase of the second preset threshold, and when the saturation value of the second preset threshold reaches the inflection point of 90Kpa, the saturation value of the first preset threshold of the vacuum pump also reaches the inflection point of 50 Kpa. The corresponding relation table of the experimental data shows different situations of specific numerical values according to different parts of various automobile manufacturers and different experimental environments, but the change rule of the numerical values is basically kept unchanged.
Example two
In another embodiment of the present invention, there is also provided a storage medium having a computer program stored therein, the computer program being invoked by a controller to perform the steps of any of the vacuum assist system based control methods described herein.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A method of controlling a vacuum assist system, comprising:
acquiring a vacuum pressure value of the current vacuum boosting system;
judging whether the vacuum pressure value reaches a first preset threshold value, if the vacuum pressure value does not reach the first preset threshold value, stopping the vacuum pump, if the vacuum pressure value reaches the first preset threshold value, continuing to work by the vacuum pump, and judging whether the vacuum pressure value reaches a second preset threshold value;
if the vacuum pressure value reaches the second preset threshold value, the vacuum pump continues to work and enters a preset threshold value self-learning mode, and if the vacuum pressure value does not reach the second preset threshold value, whether a first pressure difference value of the vacuum boosting system in unit time is smaller than a first preset vacuum pressure difference value P1 is detected;
if the first pressure difference value of the vacuum boosting system in unit time is smaller than a first preset pressure difference value P1, the vacuum pump continues to work and enters the preset threshold self-learning mode, and if the first pressure difference value is larger than or equal to a first preset pressure value P1, the vacuum pump continues to work, and the current vacuum pressure value of the vacuum boosting system is obtained again and compared with the second preset threshold.
2. The control method of the vacuum boosting system according to claim 1, wherein the preset threshold self-learning mode comprises the following specific steps:
judging whether the brake pedal is stepped down;
if the brake pedal is stepped on, exiting the preset threshold self-learning mode;
if the brake pedal is not stepped on, judging whether a detected second pressure difference value of the current vacuum boosting system in unit time is smaller than a second preset pressure difference value P2, if the second pressure difference value is larger than or equal to the second preset pressure difference value P2, judging whether the brake pedal is stepped on again, and if the second pressure difference value is smaller than the second preset pressure difference value P2, judging whether the duration time of the second pressure difference value in unit time reaches a preset time T1;
if the duration of the second pressure difference value does not reach the preset time T1, ending the preset threshold self-learning mode, and if the duration of the second pressure difference value reaches the preset time T1, taking the current vacuum pressure value as a second preset threshold;
after the second preset threshold is obtained, the first preset threshold is obtained by inquiring the corresponding relation table of the first preset threshold and the second preset threshold of the vacuum pump, and the self-learning mode of the preset threshold is exited.
3. A storage medium having a computer program stored therein, characterized in that: the computer program is invoked by a controller for executing the steps of a method of controlling a vacuum assist system according to any of claims 1 to 2.
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Cited By (9)
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| CN111591271A (en) * | 2020-05-27 | 2020-08-28 | 重庆长安新能源汽车科技有限公司 | Control method of vacuum pump and computer-storable medium |
| CN111873971A (en) * | 2020-07-30 | 2020-11-03 | 重庆长安汽车股份有限公司 | Vacuum power-assisted brake system of automobile |
| CN112097431A (en) * | 2020-09-16 | 2020-12-18 | 合肥华凌股份有限公司 | Vacuum preservation method, vacuum control device and refrigeration equipment |
| CN112721892A (en) * | 2020-12-30 | 2021-04-30 | 浙江合众新能源汽车有限公司 | Plateau control method for vacuum system of new energy electric vehicle |
| CN113246946A (en) * | 2021-05-30 | 2021-08-13 | 重庆长安汽车股份有限公司 | Electronic vacuum pump system fault processing method |
| CN114620018A (en) * | 2020-12-14 | 2022-06-14 | 威马智慧出行科技(上海)股份有限公司 | Vacuum pump control method, system, storage medium and electronic device |
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| CN115214581A (en) * | 2022-05-18 | 2022-10-21 | 广州汽车集团股份有限公司 | Control method and device, vehicle and storage medium |
| CN115285093A (en) * | 2022-08-17 | 2022-11-04 | 上海拿森汽车电子有限公司 | Push rod zero-position self-learning method of electronic booster for automobile and electronic equipment |
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| 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 |
| CN112721892A (en) * | 2020-12-30 | 2021-04-30 | 浙江合众新能源汽车有限公司 | Plateau control method for vacuum system of new energy electric vehicle |
| CN113246946A (en) * | 2021-05-30 | 2021-08-13 | 重庆长安汽车股份有限公司 | Electronic vacuum pump system fault processing method |
| CN115214581A (en) * | 2022-05-18 | 2022-10-21 | 广州汽车集团股份有限公司 | Control method and device, vehicle and storage medium |
| CN115214581B (en) * | 2022-05-18 | 2023-07-25 | 广州汽车集团股份有限公司 | Control method and device, vehicle and storage medium |
| CN115214593A (en) * | 2022-07-20 | 2022-10-21 | 广州汽车集团股份有限公司 | Jamming fault detection method, jamming fault detection device, jamming fault processing method, control system and medium |
| CN115214593B (en) * | 2022-07-20 | 2023-11-17 | 广州汽车集团股份有限公司 | Detection method, device, processing method, control system and medium for stuck fault |
| CN115285093A (en) * | 2022-08-17 | 2022-11-04 | 上海拿森汽车电子有限公司 | Push rod zero-position self-learning method of electronic booster for automobile and electronic equipment |
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