CN212838278U - Control system of electronic vacuum pump - Google Patents
Control system of electronic vacuum pump Download PDFInfo
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- CN212838278U CN212838278U CN202021240775.3U CN202021240775U CN212838278U CN 212838278 U CN212838278 U CN 212838278U CN 202021240775 U CN202021240775 U CN 202021240775U CN 212838278 U CN212838278 U CN 212838278U
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- 238000011217 control strategy Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The utility model provides a control system of electron vacuum pump can accurate control vacuum pump work, and extension vacuum pump life promotes brake performance. This control system includes electron vacuum pump, electron vacuum pump controller, pressure sensor I, pressure sensor II, vacuum booster, check valve, vacuum line and pencil, vacuum booster pass through vacuum line with electron vacuum pump connects, the check valve sets up vacuum booster with in the vacuum line between the electron vacuum pump, pressure sensor I is the atmospheric pressure sensor who passes through the pencil and be connected with the electron vacuum pump controller, pressure sensor II detects pressure sensor of pressure in the vacuum booster, pressure sensor II passes through the pencil with the electron vacuum pump controller and is connected, electron vacuum pump controller respectively with electron vacuum pump and CAN bus connection.
Description
Technical Field
The utility model relates to a car braking vacuum power-assisted control field, concretely relates to control system of electron vacuum pump.
Background
Along with the development trend of energy conservation and emission reduction in the automobile industry, the popularization of the engine turbocharging technology and the problem of insufficient vacuum degree of an engine are more and more prominent, and the automobile industry has more and more great requirements on a vacuum pump; with the implementation of national emission, the disadvantage that the mechanical vacuum pump influences the oil consumption is prominent and is gradually eliminated, and the electronic vacuum pump develops in a blowout mode in nearly two years; in the aspect of control strategies, most of the control strategies adopt a simple control strategy integrated in an engine control unit, after the vacuum degree is lower than a certain threshold value, the opening of the vacuum pump is controlled through a relay, after the vacuum degree reaches the certain threshold value, the vacuum pump is controlled to be closed through the relay, the control logic is too simple and violent, and under the condition that the environmental air pressure is too low or a sensor fails, the electronic vacuum pump works for a long time, the abrasion is aggravated, the noise is increased, and the service life is shortened; or the threshold value is set unreasonably, so that the vacuum degree is insufficient, the brake pedal is hard, user complaints are generated, and safety accidents are more likely to be caused under the extreme working conditions.
Disclosure of Invention
The utility model aims at providing a control system of electron vacuum pump can accurate control vacuum pump work, and extension vacuum pump life promotes brake performance.
According to the utility model provides a control system of electron vacuum pump, including electron vacuum pump, electron vacuum pump controller, pressure sensor I, pressure sensor II, vacuum booster, check valve, vacuum line and pencil, vacuum booster pass through vacuum line with electron vacuum pump connects, the check valve sets up vacuum booster with among the vacuum line between the electron vacuum pump, pressure sensor I is the atmospheric pressure sensor who passes through the pencil with the electron vacuum pump controller and be connected, pressure sensor II detects pressure sensor of pressure among the vacuum booster, pressure sensor II passes through the pencil with the electron vacuum pump controller and is connected, electron vacuum pump controller respectively with electron vacuum pump and CAN bus connection.
Furthermore, the input end of the electronic vacuum pump controller connected with the CAN bus comprises a vehicle speed signal, a key state signal, an environment temperature signal, a driving mode signal, a brake pedal state signal and a brake master cylinder pressure signal.
Further, the output end of the electronic vacuum pump controller connected with the CAN bus comprises a vacuum degree request signal, a brake request signal and an electronic vacuum pump control system fault signal.
Further, the CAN bus is respectively connected with the engine control unit, the vehicle body stability control system and the combination instrument.
The utility model discloses a theory of operation does: the electronic vacuum pump controller receives corresponding vehicle speed signal through the CAN bus, key state signal, ambient temperature signal, driving mode signal, brake pedal state signal, brake master cylinder pressure signal, and through pressure sensor I, pressure sensor II detects the pressure in ambient pressure value and the vacuum booster respectively, thereby control opening and closing of electronic vacuum pump or control the vacuum pumping speed through the motor speed of adjusting electronic vacuum pump, and simultaneously, the electronic vacuum pump controller CAN also send vacuum degree request signal to request engine control unit to cut off some loads to promote system vacuum degree, or send brake request signal to request automobile body stable control system initiative pressure boost, and then reach accurate control vacuum pump work, prolong the vacuum pump life, promote the purpose of brake performance.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a control logic diagram of the present invention.
In which the figures are as follows: EVP, electronic vacuum pump; EVP _ ECU, electronic vacuum pump controller; a pressure sensor I; a pressure sensor II; a vacuum booster; the vacuum pipeline is integrated with a one-way valve; a CAN bus; vehicle _ Speed, Vehicle Speed signal; key _ Sts, Key status signal; external _ Temperature, ambient Temperature signal; drive _ Mode, driving Mode signal; brake _ Pedal _ Sts, Brake Pedal status signal; pressure _ Master _ Cylinder, brake Master Cylinder Pressure signal; vacuum _ Request, Vacuum Request signal; brake _ Request, Brake Request signal; EVP _ Warnng, electronic vacuum pump control system fault signal; an engine vacuum source; a brake pedal; a brake master cylinder and a pipeline; a brake pipe; a brake; EMS, engine control unit; ESC, car body stable control system; ABS, brake anti-lock system; ICM, instrument cluster; n, actual rotating speed of a vacuum pump motor; ponActual vacuum pump motor starting threshold; poffActual vacuum pump motor shutdown threshold.
Detailed Description
The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings, for example, the shapes and structures of the respective members, the mutual positions and connection relationships between the respective portions, the functions and operation principles of the respective portions, and the like.
As shown in fig. 1 and 2, the utility model discloses a control system of electron vacuum pump, including electron vacuum pump EVP, electron vacuum pump controller EVP _ ECU, pressure sensor I, pressure sensor II, vacuum booster, the check valve, vacuum pipeline and pencil, vacuum booster passes through vacuum pipeline and is connected with electron vacuum pump EVP, the check valve is integrated to be set up in the vacuum pipeline between vacuum booster and electron vacuum pump EVP, pressure sensor I is the atmospheric pressure sensor who passes through the pencil with electron vacuum pump controller EVP _ ECU and is connected, pressure sensor II is the pressure sensor who detects pressure in the vacuum booster, pressure sensor II passes through the pencil with electron vacuum pump controller EVP _ ECU and is connected, electron vacuum pump controller EVP _ ECU respectively with electron vacuum pump EVP and CAN bus connection. In order to visually display the control and connection structure of the vacuum booster, the broken line frame in fig. 1 also represents other connection structures of the vacuum booster, including the connection with the vacuum source of the engine through a vacuum pipeline; the brake pedal input and the connection structure with a vehicle body stability control system ESC or a brake anti-lock system ABS through a brake master cylinder and a pipeline.
Preferably, the input end of the electronic vacuum pump controller EVP _ ECU connected with the CAN bus comprises a Vehicle Speed signal Vehicle _ Speed, a Key state signal Key _ Sts, an ambient Temperature signal External _ Temperature, a driving Mode signal Drive _ Mode, a Brake Pedal state signal Brake _ Pedal _ Sts and a Brake Master Cylinder Pressure signal Pressure _ Master _ Cylinder.
Preferably, the output of the electronic Vacuum pump controller EVP _ ECU connected to the CAN bus includes a Vacuum level Request signal value _ Request, a Brake Request signal Brake _ Request, and an electronic Vacuum pump control system fault signal EVP _ Warning.
Preferably, the CAN bus is connected to the engine control unit EMS, the vehicle body stability control system ESC, and the combination meter ICM, respectively.
The utility model discloses a theory of operation does: the electronic Vacuum pump controller EVP _ ECU receives corresponding Vehicle Speed signals Vehicle _ Speed, Key state signals Key _ St, ambient Temperature signals External _ Temperature, driving Mode signals Drive _ Mode, Brake Pedal state signals Brake _ Peal _ St and Brake Master Cylinder Pressure signals Preserve _ Master _ Cylinder through a CAN bus, respectively detects ambient Pressure values and Pressure in a Vacuum booster through a Pressure sensor I and a Pressure sensor II, so as to control the opening and closing of the electronic Vacuum pump EVP or control Vacuum pumping Speed by adjusting the motor Speed of the electronic Vacuum pump EVP, and simultaneously, the electronic Vacuum pump controller EVP _ ECU CAN also send a Vacuum degree Request signal Vacuum _ Request to Request an engine control unit EMS to cut off some unnecessary loads such as an air conditioner to improve the system Vacuum degree, or send a Brake Request signal Brake _ Request to Request an ESC to actively boost Pressure, so as to precisely control the Vacuum pump to work, the service life of the vacuum pump is prolonged, and the braking performance is improved.
The utility model discloses an electronic vacuum pump controller EVP _ ECU's control strategy is as shown in FIG. 2, actually including normally traveling operating mode and special operating mode two kinds:
1. in the case of normal driving conditions:
1.1, different driving modes Drive _ Mode:
the general automobile has driving modes such as ECO, SPORT and the like, different vacuum pump control strategies are made under different driving modes, and the rotating speed of a motor of a vacuum pump is correspondingly adjusted under the SPORT mode compared with the ECO mode; the sensitivity coefficient is a;
1.2, different ambient pressures:
when the environmental pressure is lower, the starting threshold value and the closing threshold value of the vacuum pump are properly reduced; correspondingly adjusting the rotating speed of a motor of the vacuum pump, wherein the sensitivity coefficient is b;
1.3, different Vehicle speeds Vehicle _ Speed:
when the vehicle speed is different, the starting threshold value and the closing threshold value of the vacuum pump are properly adjusted, the rotating speed of a motor of the vacuum pump is correspondingly adjusted, and the sensitivity coefficient is c;
1.4, different ambient Temperature External _ Temperature:
when the temperature is different, the rotating speed of the vacuum pump motor is correspondingly adjusted, and the sensitivity coefficient is d;
1.5, Pressure _ Master _ Cylinder of different brake Master cylinders:
when the master cylinder pressure is different, the starting threshold value and the closing threshold value of the vacuum pump are properly adjusted, the rotating speed of a motor of the vacuum pump is correspondingly adjusted, and the sensitivity coefficient is e;
N=a*b*c*d*e*Nrated value
Pon=a*b*c*d*e*Pon rating
Poff=a*b*c*d*e*Poff rating
Wherein, N, Pon、PoffThe actual vacuum pump motor rotating speed, the vacuum pump motor starting threshold value and the vacuum pump motor closing threshold value are obtained; n is a radical ofRated value、Pon rating、Poff ratingThe method comprises the steps of calculating the rotating speed of a vacuum pump motor, the starting threshold value of the vacuum pump motor and the closing threshold value of the vacuum pump motor of a vehicle under a standard working condition.
2. The special working condition is as follows:
2.1, Key _ Sts = on, when the engine is unable to provide vacuum:
the vacuum pump starts to work at a high rotating speed, and the braking requirement of a user at the stage is met.
2.2, when the vacuum pump runs for a long time under full load and the vacuum degree still cannot meet the requirement:
the continuous working time T = T of the vacuum pumpmaxThen, the vacuum pump stops working; and simultaneously, sending a Vacuum degree Request signal value _ Request to Request an engine control unit EMS to cut off unnecessary loads (such as an air conditioner) to improve the system Vacuum degree, sending a Brake Request signal Brake _ Request to Request a vehicle body stability control system ESC to actively boost pressure for compensation, wherein the compensation amount needs to be jointly debugged with the vehicle body stability control system ESC in the development process.
2.3, when the vacuum control system fails:
the EVP _ ECU sends an EVP _ Warning signal to an ICM (integrated control unit) of the combination instrument to prompt a driver to overhaul the system, and simultaneously sends a Brake Request signal Brake _ Request to Request an ESC (stability control system) of the vehicle body to actively boost pressure for compensation, wherein the compensation quantity needs to be jointly debugged with the ESC of the vehicle body stability control system in the development process.
The present invention has been described in detail with reference to the accompanying drawings, and it is apparent that the present invention is not limited by the above embodiments, and various insubstantial improvements can be made without modification to the present invention.
Claims (4)
1. The utility model provides a control system of electron vacuum pump, its characterized in that includes electron vacuum pump, electron vacuum pump controller, pressure sensor I, pressure sensor II, vacuum booster, check valve, vacuum line and pencil, vacuum booster pass through vacuum line with electron vacuum pump connects, the check valve sets up vacuum booster with among the vacuum line between the electron vacuum pump, pressure sensor I is the atmospheric pressure sensor who passes through the pencil with the electron vacuum pump controller and be connected, pressure sensor II detects pressure sensor of pressure in the vacuum booster, pressure sensor II passes through the pencil with the electron vacuum pump controller and is connected, electron vacuum pump controller respectively with electron vacuum pump and CAN bus connection.
2. The control system of the electronic vacuum pump of claim 1 wherein the inputs to which the electronic vacuum pump controller is connected to the CAN bus include a vehicle speed signal, a key status signal, an ambient temperature signal, a driving mode signal, a brake pedal status signal, a master cylinder pressure signal.
3. Control system of an electronic vacuum pump according to claim 1 or 2, characterized in that the output of the electronic vacuum pump controller connected to the CAN bus comprises a vacuum level request signal, a brake request signal and an electronic vacuum pump control system fault signal.
4. The control system of the electronic vacuum pump according to claim 3, wherein the CAN bus is connected to an engine control unit, a vehicle body stability control system and a combination meter, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021240775.3U CN212838278U (en) | 2020-06-30 | 2020-06-30 | Control system of electronic vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021240775.3U CN212838278U (en) | 2020-06-30 | 2020-06-30 | Control system of electronic vacuum pump |
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| CN212838278U true CN212838278U (en) | 2021-03-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114312707A (en) * | 2021-12-16 | 2022-04-12 | 东风汽车集团股份有限公司 | ADAS visual perception-based electric vacuum pump control method, system and medium |
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2020
- 2020-06-30 CN CN202021240775.3U patent/CN212838278U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114312707A (en) * | 2021-12-16 | 2022-04-12 | 东风汽车集团股份有限公司 | ADAS visual perception-based electric vacuum pump control method, system and medium |
| CN114312707B (en) * | 2021-12-16 | 2022-11-01 | 东风汽车集团股份有限公司 | ADAS visual perception-based electric vacuum pump control method, system and medium |
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