CN114407862A - Vacuum pump control method controlled by VCU - Google Patents
Vacuum pump control method controlled by VCU Download PDFInfo
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- CN114407862A CN114407862A CN202210151507.1A CN202210151507A CN114407862A CN 114407862 A CN114407862 A CN 114407862A CN 202210151507 A CN202210151507 A CN 202210151507A CN 114407862 A CN114407862 A CN 114407862A
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- vacuum pump
- pressure
- vcu
- altitude
- atmospheric pressure
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003068 static effect Effects 0.000 claims description 3
- 238000011217 control strategy Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a vacuum pump control method controlled by VCU, VCU receives altitude signal sent by T-BOX, looks up altitude and air pressure comparison table to obtain corresponding ambient atmospheric pressure; or calculating corresponding ambient atmospheric pressure according to a relational formula of the ambient pressure and the altitude; meanwhile, whether the vacuum pump needs to be started or closed at present is judged according to the internal absolute pressure of the vacuum pipeline of the vacuum pump. By adopting the technical scheme, on the basis of not increasing a sensor, in consideration of the great difference between the atmospheric pressure of a plain and an altitude, a GPS (global positioning system) altitude signal is increased on the basis of the prior art, the atmospheric pressure of the position is judged through the altitude signal, and the vacuum pump control is carried out at the moment; the cost is reduced under the condition of realizing the function of the whole vehicle; and the whole vehicle accessory control strategy is optimized, and the driving comfort and safety are improved.
Description
Technical Field
The invention belongs to the technical field of vacuum pump control of an electric automobile brake system. More particularly, the present invention relates to a VCU-controlled vacuum pump control method.
Background
The electric automobile is driven by the motor, a traditional engine is omitted, so that a vacuum source is lost, namely, vacuum assistance cannot be provided for an automobile braking system, and the electric vacuum pump is arranged on the electric automobile to provide vacuum assistance for the braking system. The vehicle-mounted power supply is adopted to provide power, air in the vacuum system is extracted to generate vacuum, and a unique and reliable vacuum source is provided for the brake system of the electric automobile, so that the brake performance of the whole automobile is effectively improved.
Be equipped with a vacuum pump absolute pressure sensor in prior art's vacuum system for detect absolute pressure value in the vacuum pump vacuum pipeline, when vacuum pump during operation, the pump can extract the inside air of vacuum system for pressure reduces gradually in the vacuum pipeline, and the vacuum degree increases, and when the vacuum degree reached the stop threshold value of vacuum pump, the vacuum pump stop work.
When the brake is stepped on, the vacuum of the vacuum system is consumed, namely, air enters the vacuum system, so that the pressure in the vacuum pipeline is gradually increased, and the vacuum degree is reduced; and when the vacuum degree is reduced to the starting threshold value of the vacuum pump, the vacuum pump starts to work again to extract vacuum.
The VCU judges whether the vacuum pump needs to be started/closed at present by judging the value of the vacuum pipeline pressure of the vacuum pump.
When the threshold value for starting the vacuum pump is judged, the calculation of opening and closing by taking the atmospheric pressure as the calculation is needed. In the case of only one pass, the atmospheric pressure is 100kPa by default. However, in this case, when the vehicle reaches a plateau area, the altitude increases, and the atmospheric pressure is significantly reduced, which leads to the operation of the vacuum system pressure of the entire vehicle at 100kpa, the internal pressure of the vacuum pump is increased, thereby affecting the braking performance of the entire vehicle.
Disclosure of Invention
The invention provides a vacuum pump control method controlled by a VCU (vacuum control unit), which aims to obtain corresponding pressure values for starting and stopping a vacuum pump when a vehicle is at different altitudes.
In order to achieve the purpose, the invention adopts the technical scheme that:
the VCU is respectively connected with a vacuum pipeline pressure sensor, a vacuum pump relay and a T-BOX through signal lines; a GPS altitude signal module is arranged in the TBOX;
the control method comprises the following steps:
when the power-ON condition of the whole vehicle is met, and the VCU detects that the vehicle is not in a static state or the VCU cannot detect the current speed, the vacuum pump is allowed to normally work when the whole vehicle is in an ON gear or within 10s after power-off;
the VCU receives an altitude signal sent by the T-BOX, looks up an altitude and air pressure comparison table and obtains corresponding ambient atmospheric pressure; or calculating corresponding ambient atmospheric pressure according to a relational formula of the ambient pressure and the altitude; meanwhile, whether the vacuum pump needs to be started or closed at present is judged according to the internal absolute pressure of the vacuum pipeline of the vacuum pump.
The judgment rule is as follows: when the absolute pressure in the vacuum pump is higher than 50% of the ambient atmospheric pressure, the vacuum pump starts to work; and when the absolute pressure in the vacuum pump is lower than 30% of the ambient atmospheric pressure, the vacuum pump stops working.
The altitude and air pressure comparison table is as follows:
| altitude/m | P/kPa | Altitude/m | P/kPa |
| 0 | 101.3 | 5000 | 54.0 |
| 1000 | 89.9 | 6000 | 47.2 |
| 2000 | 79.5 | 7000 | 41.0 |
| 3000 | 70.1 | 8000 | 35.6 |
| 4000 | 61.6 | 9000 | 30.7 |
The relational formula of the ambient atmospheric pressure and the altitude is as follows:
P＝e5.25885*ln(288.15-0.0065h)-18.2573
in the formula: p is ambient atmospheric pressure, (kPa); h is altitude, (m).
And when the power is on or the GPS signal of the T-BOX is invalid, the VCU defaults to the opening and closing pressure values of the vacuum pump at the last time.
In the working process of the vacuum pump, if the pressure of a vacuum pipeline of the vacuum pump tends to be stable and does not reach the working stop pressure of the vacuum pump, the vacuum pump needs to be stopped, and the current pressure value is set as the new working stop pressure of the vacuum pump.
The pressure tends to be stable, and the continuous working time of the vacuum pump is more than or equal to 60 s.
By adopting the technical scheme, on the basis of not increasing a sensor, in consideration of the great difference between the atmospheric pressure of a plain and an altitude, the GPS altitude signal is increased on the basis of the prior art, the atmospheric pressure of the position is judged through the altitude signal, and the vacuum pump control is carried out at the moment; the cost is reduced under the condition of realizing the function of the whole vehicle; and the whole vehicle accessory control strategy is optimized, and the driving comfort and safety are improved.
Drawings
The contents of the drawings are briefly described as follows:
FIG. 1 is a control logic diagram of the VCU of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
The structure of the invention shown in fig. 1 is a VCU-controlled vacuum pump control method. The VCU is respectively connected with the vacuum pipeline pressure sensor, the vacuum pump relay and the T-BOX through signal lines.
In order to solve the problems in the prior art, overcome the defects and achieve the aim of obtaining corresponding pressure values for starting and stopping the vacuum pump when the vehicle is at different altitudes, the invention adopts the technical scheme that:
as shown in FIG. 1, the VCU controlled vacuum pump control method of the invention, set up GPS altitude signal module in said TBOX;
on the basis of not increasing a sensor, the atmospheric pressure of a plain and an altitude is considered to be greatly different, so that the GPS altitude signal is added on the basis of the whole vehicle, the atmospheric pressure of the position is judged through the altitude signal, and the vacuum pump control is carried out at the moment. After the GPS altitude information is added, the current altitude information can be read, the current atmospheric pressure can be obtained through table look-up or formula calculation, and then the current opening and closing threshold values of the vacuum pump are obtained
The control method comprises the following steps:
when the power-ON condition of the whole vehicle is met, and the VCU detects that the vehicle is not in a static state or the VCU cannot detect the current speed, the vacuum pump is allowed to normally work when the whole vehicle is in an ON gear or within 10s after power-off;
the VCU receives an altitude signal sent by the T-BOX, looks up an altitude and air pressure comparison table and obtains corresponding ambient atmospheric pressure; or calculating corresponding ambient atmospheric pressure according to a relational formula of the ambient pressure and the altitude; meanwhile, whether the vacuum pump needs to be started or closed at present is judged according to the internal absolute pressure of the vacuum pipeline of the vacuum pump.
The judgment rules are shown in the following table 1:
TABLE 1 vacuum pump opening closing pressure
Namely: the judgment rule is as follows: when the absolute pressure in the vacuum pump is higher than 50% of the ambient atmospheric pressure, the vacuum pump starts to work; and when the absolute pressure in the vacuum pump is lower than 30% of the ambient atmospheric pressure, the vacuum pump stops working.
If the GPS altitude information is not obtained, only one atmospheric pressure can be defaulted everywhere, and when the altitude is low, the atmospheric pressure is low, so that the vacuum pump is more difficult to reach the starting threshold value; but after having GPS height above sea level signal, just can come change atmospheric pressure according to real-time position, open and close the threshold value and can change according to current position real-time, can promote the driving and feel, improve the travelling comfort.
The altitude and air pressure comparison table is shown in the following table 2:
TABLE 2 calculated altitude-barometric pressure reference Table
| Altitude/m | P/kPa | Altitude/m | P/kPa |
| 0 | 101.3 | 5000 | 54.0 |
| 1000 | 89.9 | 6000 | 47.2 |
| 2000 | 79.5 | 7000 | 41.0 |
| 3000 | 70.1 | 8000 | 35.6 |
| 4000 | 61.6 | 9000 | 30.7 |
The relational formula of the ambient atmospheric pressure and the altitude is as follows:
P＝e5.25885*ln(288.15-0.0065h)-18.2573
in the formula: p is ambient atmospheric pressure, (kPa); h is altitude, (m).
And when the power is on or the GPS signal of the T-BOX is invalid, the VCU defaults to the opening and closing pressure values of the vacuum pump at the last time.
For example, at an altitude of 0m, the vacuum pump is turned on when the internal pressure of the vacuum pump is detected to be greater than 50.515kPa, and turned off when the pressure is lower than 30.39 kPa.
In the working process of the vacuum pump, if the pressure of a vacuum pipeline of the vacuum pump tends to be stable (the continuous working is more than or equal to 60s), but the pressure does not reach the working stop pressure of the vacuum pump (namely the air suction capacity of the vacuum pump is weakened), the working of the vacuum pump needs to be stopped, and the current pressure value is set as the new working stop pressure of the vacuum pump.
The pressure tends to be stable, and the continuous working time of the vacuum pump is more than or equal to 60 s.
The working strategy can improve the braking performance of the whole vehicle on plateau when only one pressure sensor is arranged, improve the driving safety and comfort, effectively reduce the cost of the whole vehicle and adapt to all vehicle types by using a single sensor.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (7)
1. A VCU controlled vacuum pump control method, said VCU connects with vacuum line pressure sensor, vacuum pump relay and T-BOX through the signal line separately;
the method is characterized in that: a GPS altitude signal module is arranged in the TBOX;
the control method comprises the following steps:
when the power-ON condition of the whole vehicle is met, and the VCU detects that the vehicle is not in a static state or the VCU cannot detect the current speed, the vacuum pump is allowed to normally work when the whole vehicle is in an ON gear or within 10s after power-off;
the VCU receives an altitude signal sent by the T-BOX, looks up an altitude and air pressure comparison table and obtains corresponding ambient atmospheric pressure; or calculating corresponding ambient atmospheric pressure according to a relational formula of the ambient pressure and the altitude; meanwhile, whether the vacuum pump needs to be started or closed at present is judged according to the internal absolute pressure of the vacuum pipeline of the vacuum pump.
2. The VCU-controlled vacuum pump control method of claim 1, wherein: the judgment rule is as follows: when the absolute pressure in the vacuum pump is higher than 50% of the ambient atmospheric pressure, the vacuum pump starts to work; and when the absolute pressure in the vacuum pump is lower than 30% of the ambient atmospheric pressure, the vacuum pump stops working.
3. The VCU-controlled vacuum pump control method of claim 1, wherein: the altitude and air pressure comparison table is as follows:
4. The VCU-controlled vacuum pump control method of claim 1, wherein: the relation formula of the ambient atmospheric pressure and the altitude is as follows: p ═ e5.25885*ln(288.15-0.0065h)-18.2573
In the formula: p is ambient atmospheric pressure, kPa; h is the altitude, m.
5. The VCU-controlled vacuum pump control method of claim 1, wherein: and when the power is on or the GPS signal of the T-BOX is invalid, the VCU defaults to the opening and closing pressure values of the vacuum pump at the last time.
6. The VCU-controlled vacuum pump control method of claim 1, wherein: in the working process of the vacuum pump, if the pressure of a vacuum pipeline of the vacuum pump tends to be stable and does not reach the working stop pressure of the vacuum pump, the vacuum pump needs to be stopped, and the current pressure value is set as the new working stop pressure of the vacuum pump.
7. The VCU-controlled vacuum pump control method of claim 6, wherein: the pressure tends to be stable, and the continuous working time of the vacuum pump is more than or equal to 60 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210151507.1A CN114407862A (en) | 2022-02-18 | 2022-02-18 | Vacuum pump control method controlled by VCU |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210151507.1A CN114407862A (en) | 2022-02-18 | 2022-02-18 | Vacuum pump control method controlled by VCU |
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| CN114407862A true CN114407862A (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210151507.1A Pending CN114407862A (en) | 2022-02-18 | 2022-02-18 | Vacuum pump control method controlled by VCU |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095515A (en) * | 2022-07-13 | 2022-09-23 | 奇瑞商用车（安徽）有限公司 | Vacuum pump monitoring system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN111098839A (en) * | 2018-10-25 | 2020-05-05 | 比亚迪股份有限公司 | Control method and device of vacuum power-assisted braking system and vehicle |
| CN112158186A (en) * | 2020-09-03 | 2021-01-01 | 长城汽车股份有限公司 | Method and device for determining vacuum degree threshold value, storage medium and electronic equipment |
| CN112644380A (en) * | 2021-01-20 | 2021-04-13 | 奇瑞汽车股份有限公司 | Vehicle altitude alarm system and method and automobile |
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2022
- 2022-02-18 CN CN202210151507.1A patent/CN114407862A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111098839A (en) * | 2018-10-25 | 2020-05-05 | 比亚迪股份有限公司 | Control method and device of vacuum power-assisted braking system and vehicle |
| CN112158186A (en) * | 2020-09-03 | 2021-01-01 | 长城汽车股份有限公司 | Method and device for determining vacuum degree threshold value, storage medium and electronic equipment |
| CN112644380A (en) * | 2021-01-20 | 2021-04-13 | 奇瑞汽车股份有限公司 | Vehicle altitude alarm system and method and automobile |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115095515A (en) * | 2022-07-13 | 2022-09-23 | 奇瑞商用车（安徽）有限公司 | Vacuum pump monitoring system and method |
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