CN113246946B - Electronic vacuum pump system fault processing method - Google Patents
Electronic vacuum pump system fault processing method Download PDFInfo
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- CN113246946B CN113246946B CN202110596292.XA CN202110596292A CN113246946B CN 113246946 B CN113246946 B CN 113246946B CN 202110596292 A CN202110596292 A CN 202110596292A CN 113246946 B CN113246946 B CN 113246946B
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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
- 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
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The scheme relates to a fault processing method of an electronic vacuum pump system, which can ensure that an electronic vacuum pump of a vehicle can normally work in areas with different vacuum degrees, can detect the fault of a vacuum power-assisted system, provides vacuum power assistance when the vacuum power-assisted system of the vehicle breaks down, and increases the redundant judgment condition of special work. The working reliability of the electronic vacuum pump is improved, and the prompt of the vehicle fault state and the maintenance guidance are provided for users and maintenance personnel. It includes: after the vehicle is powered on, the vehicle control unit controls an electronic vacuum pump of the vehicle to start for a first time period, and then obtains the vacuum degree in the vacuum booster collected by the vacuum pressure sensor; determining a status level of the electronic vacuum pump system based on the vacuum level; controlling the working time of the electronic vacuum pump based on the state grade and the acquired brake signal; and the vehicle control unit outputs prompt information for prompting the state of the electronic vacuum pump system according to the state grade control instrument.
Description
Technical Field
The invention relates to a vacuum boosting system for a brake system of a vehicle capable of purely running, in particular to a fault processing method for an electronic vacuum pump system.
Background
The existing control method of the electronic vacuum pump judges whether the electronic vacuum pump is in a plateau area or not by using the working time length and the vacuum degree value, and can effectively solve the ablation problem caused by long-time working of the electronic vacuum pump in a low vacuum area. In addition, the electronic vacuum pump only uses a pedal switch as a judgment when working in a plateau area, and has no redundancy design, and the electronic vacuum pump cannot work after a fault occurs, so that potential safety hazards exist.
Disclosure of Invention
The invention aims to provide a fault processing method of an electronic vacuum pump system, which can ensure that an electronic vacuum pump of a vehicle can normally work in various areas with different vacuum degrees, can detect the fault of a vacuum boosting system, provides vacuum boosting when the vacuum boosting system of the vehicle fails and increases the judgment condition of special working redundancy. The working reliability of the electronic vacuum pump is improved, and the prompt of the vehicle fault state and the maintenance guidance are provided for users and maintenance personnel.
The embodiment of the invention provides a fault processing method of an electronic vacuum pump system, which comprises the following steps:
after the vehicle is powered on, the vehicle control unit controls an electronic vacuum pump of the vehicle to start for a first time, and then obtains the vacuum degree inside the vacuum booster periodically acquired by the vacuum pressure sensor;
the vehicle control unit determines the state grade of the electronic vacuum pump system based on the vacuum degree;
the vehicle control unit controls the working time of the electronic vacuum pump based on the state grade and the acquired braking signal; and the vehicle controller controls the vehicle instrument to output prompt information for prompting the state of the electronic vacuum pump system according to the state grade.
Preferably, the step of the vehicle control unit determining the fault level of the electronic vacuum pump system based on the vacuum degree includes:
if the change gradient of the vacuum degree in each preset time period is greater than a preset amount, determining that the electronic vacuum pump system is in a first-stage state indicating that the vacuum degree value is an invalid value;
if the vacuum degree is greater than a preset closing threshold value or less than a preset opening threshold value in N continuous periods, determining that the electronic vacuum pump system is in a secondary state of the fault of the vacuum pressure sensor;
if the leakage rate of the vacuum degree in continuous M periods is between the first leakage rate and the second leakage rate, determining that the electronic vacuum pump system is in a three-stage state with vacuum leakage;
if the leakage amount of the vacuum pump in one period is larger than the third leakage amount, determining that the electronic vacuum pump system is in a four-stage state with vacuum leakage;
and if the vacuum pump is lower than a preset starting threshold value in Z continuous periods and the vacuum degree difference values of M continuous periods are smaller than a preset numerical value, determining that the electronic vacuum pump system is in a low-vacuum five-stage state.
Preferably, the step that the vehicle controller controls the vehicle instrument to output prompt information for prompting the state of the electronic vacuum pump system according to the state grade comprises the following steps:
if the vehicle controller determines that the electronic vacuum pump system is in a primary state, a secondary state or a tertiary state, controlling a vehicle instrument to output prompt information that the electronic vacuum pump system is in a primary fault;
and if the vehicle controller determines that the electronic vacuum pump system is in the four-stage state, controlling the vehicle instrument to output prompt information that the electronic vacuum pump system is in the secondary fault.
Preferably, the step of controlling the working time of the electronic vacuum pump by the vehicle control unit based on the state grade and the acquired braking signal comprises:
after the vehicle controller determines that the electronic vacuum pump system is in any one of a first-stage state and a fifth-stage state, if a brake pedal treading signal fed back by a brake pedal switch and/or a trigger signal that master cylinder pressure fed back by a brake master cylinder pressure sensor is lower than preset pressure are obtained, the vehicle controller controls the electronic vacuum pump to start for a second time; the first duration is higher than the second duration.
The invention has the beneficial effects that: the method can ensure that the electronic vacuum pump can work normally in different vacuum degree areas, simultaneously detects the fault of the vacuum boosting system, firstly ensures that the vacuum boosting of the vehicle has no problem after the fault occurs, and secondly carries out alarm prompt on the fault. The pressure signal of the main cylinder is added as a redundant judgment condition, and the working reliability of the electronic vacuum pump is high.
Drawings
FIG. 1 is a diagram of the connection between an electronic vacuum pump and related parts;
FIG. 2 is a flow chart showing the implementation of the present invention;
the parts in the figure are respectively as follows: 1. the system comprises a brake pedal, 2 a vacuum booster, 3 a vacuum pressure sensor, 4 a vacuum pipe with a one-way valve, 5 an electronic vacuum pump, 6 a vehicle control unit, 7 a main cylinder pressure sensor, 8 and a combination instrument.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the electronic vacuum pump system in the present embodiment includes hardware including a brake pedal 1, a vacuum booster 2, a vacuum pressure sensor 3, a vacuum pipe with check valve 4, an electronic vacuum pump 5, a vehicle control unit 6, a master cylinder pressure sensor 7, and a combination meter 8. The vacuum booster 2 is connected with an electronic vacuum pump 5 through a vacuum pipe with a one-way valve 4. The vacuum pressure sensor 3 monitors the vacuum degree of the vacuum booster 2, converts the vacuum degree into an electric signal and sends the electric signal to the vehicle control unit 6, and the vehicle control unit 6 judges according to the vacuum degree signal value and the signals of the brake pedal 1 and the main cylinder pressure sensor 7, controls the electronic vacuum pump 5 to work, and extracts the air in the vacuum booster 2.
As shown in fig. 2, the control method of the electronic vacuum pump system according to the present invention is described as follows:
step 2, monitoring the vacuum degree in the vacuum booster 2 by the vacuum pressure sensor 3;
and 4, controlling the electronic vacuum pump 5 to work and judging the state grade of the electronic vacuum pump system by the vehicle control unit 6 according to the vacuum degree signal.
Specifically, the vehicle control unit can determine that the electronic vacuum pump system is in one of 6 level status levels according to the vacuum degree.
If the vacuum degree is within the normal setting range (preset threshold range), the electronic vacuum pump system is determined to be in a normal state, and at the moment, the electronic vacuum pump 5 works according to the preset threshold range, namely, the electronic vacuum pump is started when the vacuum degree is lower than the starting threshold and is closed when the vacuum degree is higher than the closing threshold.
If the vacuum degree change gradient is greater than 60mbar/30ms, the vehicle control unit 6 records that the electronic vacuum pump system is in a first-level state in which the vacuum degree value is an invalid value; and the primary fault of the whole vehicle is displayed on the combination meter 8. And then, if the vehicle control unit detects that the brake pedal 1 is pressed down and/or the master cylinder pressure sent by the master cylinder pressure sensor 7 is lower than a preset pressure (5 bar) signal, controlling the electronic vacuum pump 5 to start and work according to the brake pedal 1 pressing down signal and/or the master cylinder pressure sensor 7 signal, wherein the working time is 5 s.
If the acquired vacuum degree continuously exceeds the threshold value within 5 periods (is greater than a preset closing threshold value or is less than a preset opening threshold value within N continuous periods), the electronic vacuum pump system is determined to be in a secondary state of the fault of the vacuum pressure sensor, and the primary fault of the whole vehicle is displayed on the combination instrument 8. And then, if the vehicle control unit detects that the brake pedal 1 is pressed down and/or the master cylinder pressure sent by the master cylinder pressure sensor 7 is lower than a preset pressure (5 bar) signal, controlling the electronic vacuum pump 5 to start and work according to the brake pedal 1 pressing down signal and/or the master cylinder pressure sensor 7 signal, wherein the working time is 5 s.
If the obtained vacuum degree is larger than 30mbar and smaller than 80mbar in 3 periods, the vehicle control unit 6 records that the electronic vacuum pump system is in a three-level vacuum degree leakage state, and displays a vehicle primary fault on the combination instrument 8; after that, if the vehicle controller detects that the brake pedal 1 is stepped on and/or the master cylinder pressure sent by the master cylinder pressure sensor 7 is lower than a preset pressure (5 bar) signal, the vehicle controller controls the electronic vacuum pump 5 to start and work according to the brake pedal 1 stepping on signal and/or the master cylinder pressure sensor 7 signal, and the working time is 5 s.
If the obtained leakage amount of the vacuum degree in 1 period is greater than 80mbar, the vehicle control unit 6 records that the electronic vacuum pump system is in a four-stage state of vacuum degree leakage, and displays a secondary fault of the whole vehicle on the combination instrument 8; and then, if the vehicle control unit detects that the brake pedal 1 is pressed down and/or the master cylinder pressure sent by the master cylinder pressure sensor 7 is lower than a preset pressure (5 bar) signal, controlling the electronic vacuum pump 5 to start and work according to the brake pedal 1 pressing down signal and/or the master cylinder pressure sensor 7 signal, wherein the working time is 5 s.
If the obtained vacuum degree is continuously lower than a preset starting threshold value in a plurality of continuous X periods and the vacuum degree is not changed, the vehicle control unit determines that the electronic vacuum pump system is in a five-stage state in a low vacuum area; after that, if the vehicle controller detects that the brake pedal 1 is stepped on and/or the master cylinder pressure sent by the master cylinder pressure sensor 7 is lower than a preset pressure (5 bar) signal, the vehicle controller controls the electronic vacuum pump 5 to start and work according to the brake pedal 1 stepping on signal and/or the master cylinder pressure sensor 7 signal, and the working time is 5 s.
In the method of the embodiment, the vehicle control unit 6 makes fault judgment on the vacuum boosting system and controls the electronic vacuum pump 5 to work according to the monitored vacuum degree and the change of the vacuum degree, so that the vehicle control unit is prevented from working according to the working logic of the plateau area for a long time after the fault. And then, if the vehicle control unit detects that the brake pedal 1 is pressed down and/or the master cylinder pressure sent by the master cylinder pressure sensor 7 is lower than a preset pressure (5 bar) signal, controlling the electronic vacuum pump 5 to start and work according to the brake pedal 1 pressing down signal and/or the master cylinder pressure sensor 7 signal, wherein the working time is 5 s.
When the electronic vacuum pump system is determined to have a fault, the method carries out information prompt of different grades through the instrument, and provides prompt of vehicle fault states and maintenance guidance for users and maintenance personnel; in addition, the method can realize that the electronic vacuum pump works in areas with different vacuum degrees.
In the embodiment of the invention, the signal of the master cylinder pressure sensor 7 is added as the redundancy judgment condition, and because the failure rate of the brake pedal switch is relatively high, when the brake pedal switch fails, the master cylinder pressure acquired by the master cylinder pressure sensor 7 can be used for controlling the electronic vacuum pump 5, and the working reliability of the electronic vacuum pump 5 is high.
Claims (3)
1. A method for handling a failure in an electronic vacuum pump system, comprising:
after the vehicle is powered on, the vehicle control unit controls an electronic vacuum pump of the vehicle to start for a first time, and then obtains the vacuum degree inside the vacuum booster periodically acquired by the vacuum pressure sensor;
the vehicle control unit determines a fault level of the electronic vacuum pump system based on the vacuum degree;
the vehicle control unit controls the working time of the electronic vacuum pump based on the fault grade and the acquired brake signal; the vehicle controller controls the vehicle instrument to output prompt information for prompting the state of the electronic vacuum pump system according to the fault level;
the step that the vehicle control unit determines the fault level of the electronic vacuum pump system based on the vacuum degree comprises the following steps:
if the change gradient of the vacuum degree in each preset time period is greater than a preset amount, determining that the electronic vacuum pump system is in a first-stage state indicating that the vacuum degree value is an invalid value;
if the vacuum degree is greater than a preset closing threshold value or less than a preset opening threshold value in N continuous periods, determining that the electronic vacuum pump system is in a secondary state of the fault of the vacuum pressure sensor;
if the leakage rate of the vacuum degree in continuous M periods is between the first leakage rate and the second leakage rate, determining that the electronic vacuum pump system is in a three-stage state with vacuum leakage;
if the leakage amount of the vacuum pump in one period is larger than the third leakage amount, determining that the electronic vacuum pump system is in a four-stage state with vacuum leakage;
and if the vacuum pump is lower than a preset starting threshold value in Z continuous periods and the vacuum degree difference values of M continuous periods are smaller than a preset numerical value, determining that the electronic vacuum pump system is in a low-vacuum five-stage state.
2. The method according to claim 1, wherein the step that the vehicle control unit controls the vehicle instrument to output prompt information for prompting the state of the electronic vacuum pump system according to the fault level comprises the following steps:
if the vehicle controller determines that the electronic vacuum pump system is in a primary state, a secondary state or a tertiary state, controlling a vehicle instrument to output prompt information that the electronic vacuum pump system is in a primary fault;
and if the vehicle controller determines that the electronic vacuum pump system is in the four-stage state, controlling the vehicle instrument to output prompt information that the electronic vacuum pump system is in the secondary fault.
3. The method of claim 1, wherein the step of the vehicle control unit performing electronic vacuum pump on-time control based on the fault level and the acquired brake signal comprises:
after the vehicle controller determines that the electronic vacuum pump system is in any one of a first-stage state and a fifth-stage state, if a brake pedal treading signal fed back by a brake pedal switch and/or a trigger signal that master cylinder pressure fed back by a brake master cylinder pressure sensor is lower than preset pressure are obtained, the vehicle controller controls the electronic vacuum pump to start for a second time; the first duration is higher than the second duration.
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| CN202110596292.XA CN113246946B (en) | 2021-05-30 | 2021-05-30 | Electronic vacuum pump system fault processing method |
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| CN202110596292.XA CN113246946B (en) | 2021-05-30 | 2021-05-30 | Electronic vacuum pump system fault processing method |
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| CN113246946B true CN113246946B (en) | 2022-07-08 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113771813A (en) * | 2021-09-14 | 2021-12-10 | 恒大新能源汽车投资控股集团有限公司 | Control method and device of vacuum brake boosting system applied to vehicle |
| CN115123172B (en) * | 2022-05-31 | 2023-11-03 | 江西五十铃汽车有限公司 | Brake system fault processing method and device, readable storage medium and vehicle |
| CN114906115B (en) * | 2022-06-14 | 2023-04-21 | 安徽江淮汽车集团股份有限公司 | Active braking control method for new energy commercial vehicle |
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