CN109484387A - A kind of control method and system of vacuum pump of electric automobile - Google Patents
A kind of control method and system of vacuum pump of electric automobile Download PDFInfo
- Publication number
- CN109484387A CN109484387A CN201811554832.2A CN201811554832A CN109484387A CN 109484387 A CN109484387 A CN 109484387A CN 201811554832 A CN201811554832 A CN 201811554832A CN 109484387 A CN109484387 A CN 109484387A
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- Prior art keywords
- vacuum
- pressure
- vacuum pump
- current
- vacuum chamber
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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
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The present invention provides the control method and system of a kind of vacuum pump of electric automobile, this method comprises: presetting environment atmospheric pressure table corresponding with the relationship of vacuum chamber pressure, environment atmospheric pressure outside obtaining, and vacuum chamber pressure needed for table determines is corresponded to according to the relationship；Current vacuum cavity pressure is obtained, when the current vacuum cavity pressure is less than required vacuum chamber pressure, control vacuum pump operating increases the pressure of vacuum chamber, until the current vacuum cavity pressure reaches required vacuum chamber pressure；Obtain brake-pedal load, and the braking output pressure of vacuum booster is calculated according to the brake-pedal load, if the braking output pressure is greater than the current vacuum cavity pressure, vacuum pump operating is controlled, until the pressure of vacuum chamber is stepped up the braking output pressure.The present invention can improve the intelligence of vacuum pump control, improve safety and convenience that electric car uses.
Description
Technical field
The present invention relates to electric vehicle brake control technology field more particularly to a kind of controlling parties of vacuum pump of electric automobile
Method and system.
Background technique
Electric car can not provide vacuum source due to not having engine for vacuum booster in braking system, at present scheme
It is to connect vacuum tank and vacuum booster by a vacuum pump, pressure switch is installed on vacuum tank, vacuum pump passes through vacuum pump
Controller control, when vacuum degree deficiency, pressure switch is jumped, and controller for vacuum pump receives signal control vacuum pump and starts work
Make, vacuumizes to realize brake boost.But there are certain deficiencies for the program, on the one hand, pressure switch is due to being mechanical knot
Structure, it is easy to damage, it is unable to satisfy the demand that automobile is frequently braked, when pressure switch is damaged, automobile will lose stopping power, and will cause
It is greatly dangerous.On the other hand, the pressure that pressure switch jumps is a definite value, when height above sea level boost air pressure reduces, will make to help
Power device vacuum chamber and ambient pressure difference reduce, and brake boost weakens, and the brake force of people's foot increases.Current each producer is true for automobile
There is no good treatment measures for the problem of empty force aid system fails, and detecting force aid system under normal circumstances, there are vacuum leaks
When, only it can show and warned in instrument, for driver before stepping on brake pedal, it is no longer valid to be known in advance system, deposits
In biggish security risk.Meanwhile existing vacuum boost system, under varying environment atmospheric pressure, Chang Wufa is preferably played
Power-assisted effect, brake pedal can change it is heavy, influence drive impression and safety.
Summary of the invention
The present invention provides the control method and system of a kind of vacuum pump of electric automobile, solves existing electric car using pressure
Switch obtains vacuum pump and controls signal, there are easy to damage, and the problem of power-assisted effect is unable to control under different atmospheric environments, energy
The intelligence of vacuum pump control is improved, safety and convenience that electric car uses are improved.
In order to achieve the above object, the present invention the following technical schemes are provided:
A kind of control method of vacuum pump of electric automobile, comprising:
Environment atmospheric pressure table corresponding with the relationship of vacuum chamber pressure is preset, external environment atmospheric pressure is obtained,
And vacuum chamber pressure needed for table determines is corresponded to according to the relationship；
Current vacuum cavity pressure is obtained, when the current vacuum cavity pressure is less than required vacuum chamber pressure, controls vacuum
Pump operating increases the pressure of vacuum chamber, until the current vacuum cavity pressure reaches required vacuum chamber pressure；
Brake-pedal load is obtained, and calculates the braking output pressure of vacuum booster according to the brake-pedal load,
If the braking output pressure is greater than the current vacuum cavity pressure, vacuum pump operating is controlled, until the pressure of vacuum chamber
It is stepped up the braking output pressure.
Preferably, further includes:
The vacuum degree for obtaining vacuum booster, when the vacuum degree is less than the first given threshold, control vacuum pump operating
Increase the vacuum degree of vacuum booster, shuts down threshold value until the vacuum degree reaches setting.
Preferably, further includes:
According to the pressure difference of the current vacuum cavity pressure and the required vacuum chamber pressure, if the pressure difference is greater than
Second given threshold then controls vacuum pump operating until the pressure difference is less than third given threshold.
Preferably, further includes:
In the vacuum pump continuous running, if the current vacuum cavity pressure gradually reduces, vacuum servo is judged
There are vacuum leak failures for device, and pass through CAN bus reporting fault message.
Preferably, further includes:
The braking deceleration that electronic stabilizing control system is sent is obtained, and is determined according to the braking deceleration and is increased or subtract
The running speed of small vacuum pump, gradually to adjust the braking output pressure.
The present invention also provides a kind of control systems of vacuum pump of electric automobile, comprising:
Barometric pressure sensor, for obtaining external environment atmospheric pressure；
First pressure sensor, for obtaining current vacuum cavity pressure；
Second pressure sensor, for obtaining brake-pedal load；
Controller for vacuum pump, for presetting environment atmospheric pressure table corresponding with the relationship of vacuum chamber pressure；And according to
The relationship corresponds to vacuum chamber pressure needed for table determines；
The controller for vacuum pump is when the current vacuum cavity pressure is less than required vacuum chamber pressure, control vacuum pump fortune
Turn to increase the pressure of vacuum chamber, until the current vacuum cavity pressure reaches required vacuum chamber pressure,
The controller for vacuum pump calculates the braking output pressure of vacuum booster also according to the brake-pedal load, such as
Described in fruit braking output pressure be greater than the current vacuum cavity pressure, then control vacuum pump operating, until vacuum chamber pressure by
Step increases to the braking output pressure.
Preferably, further includes:
Vacuum sensor, for obtaining the vacuum degree of vacuum booster；
For the controller for vacuum pump when the vacuum degree is less than the first given threshold, control vacuum pump operating helps vacuum
The vacuum degree of power device increases, and shuts down threshold value until the vacuum degree reaches setting.
Preferably, the controller for vacuum pump is also used to according to the current vacuum cavity pressure and the required vacuum chamber pressure
The pressure difference of power controls vacuum pump operating until the pressure difference is less than if the pressure difference is greater than the second given threshold
Third given threshold.
Preferably, the controller for vacuum pump is also used in the vacuum pump continuous running, if the current vacuum
Cavity pressure gradually reduces, then judging vacuum booster, there are vacuum leak failures, and passes through CAN bus reporting fault message.
Preferably, the controller for vacuum pump is also used to obtain the braking deceleration of electronic stabilizing control system transmission, and
Determine the running speed for increasing or reducing vacuum pump, according to the braking deceleration gradually to adjust the braking output pressure.
The present invention provides the control method and system of a kind of vacuum pump of electric automobile, passes through default environment atmospheric pressure and institute
It needs the relationship of vacuum chamber pressure to correspond to table, determines current vacuum cavity pressure and required vacuum chamber pressure, and then control vacuum pump fortune
Turn, incrementally increases vacuum chamber pressure.It solves existing electric car and vacuum pump control signal is obtained using pressure switch, exist easily
Damage, and the problem of power-assisted effect is unable to control under different atmospheric environments, the intelligence of vacuum pump control can be improved, electricity is improved
The safety and convenience that electrical automobile uses.
Detailed description of the invention
In order to illustrate more clearly of specific embodiments of the present invention, attached drawing needed in the embodiment will be made below
Simply introduce.
Fig. 1: being a kind of control method schematic diagram of vacuum pump of electric automobile provided by the invention；
Fig. 2: being a kind of control system architecture figure of vacuum pump of electric automobile provided by the invention.
Specific embodiment
The scheme of embodiment in order to enable those skilled in the art to better understand the present invention with reference to the accompanying drawing and is implemented
Mode is described in further detail the embodiment of the present invention.
For current automobile vacuum power-assisting system under different atmospheric environmental pressures, easily cause vacuum booster effective
The phenomenon that power-assisted.The present invention provides the control method and system of a kind of vacuum pump of electric automobile, by presetting environment atmospheric pressure
Table corresponding with the relationship of required vacuum chamber pressure determines current vacuum cavity pressure and required vacuum chamber pressure, and then controls vacuum
Pump operating, incrementally increases vacuum chamber pressure.It solves existing electric car and vacuum pump control signal is obtained using pressure switch, deposit
Easy to damage, and the problem of power-assisted effect is unable to control under different atmospheric environments, the intelligence of vacuum pump control can be improved, is changed
The safety and convenience that kind electric car uses.
As shown in Figure 1, a kind of control method of vacuum pump of electric automobile, comprising:
S1: presetting environment atmospheric pressure table corresponding with the relationship of vacuum chamber pressure, obtains external ambient atmosphere pressure
Power, and vacuum chamber pressure needed for table determines is corresponded to according to the relationship；
S2: obtaining current vacuum cavity pressure, and when the current vacuum cavity pressure is less than required vacuum chamber pressure, control is true
Sky pump operating increases the pressure of vacuum chamber, until the current vacuum cavity pressure reaches required vacuum chamber pressure.
S3: brake-pedal load is obtained, and pressure is exported according to the braking that the brake-pedal load calculates vacuum booster
Power controls vacuum pump operating, until the pressure of vacuum chamber if the braking output pressure is greater than the current vacuum cavity pressure
Power is stepped up the braking output pressure.
In practical applications, often according to brake-pedal load, setting braking output pressure interval of acceptance can be braked by highest
Output pressure curve and minimum braking output pressure curve form interval of acceptance, when brake pedal is operated, the theory of generation
When braking output pressure in interval of acceptance, indicate that vacuum booster is working properly, in the difference of the atmospheric pressure of different regions,
Also result in the failure of vacuum booster, in this case, need to by adjusting electric vacuum pump starting threshold value and shut down threshold value, come
Adjust the working performance of vacuum booster.The method for setting starting threshold value according to required vacuum chamber pressure and shutting down threshold value, energy
The intelligence of vacuum pump control is improved, safety and convenience that electric car uses are improved.
This method further include:
S4: obtaining the vacuum degree of vacuum booster, when the vacuum degree is less than the first given threshold, control vacuum pump fortune
Turn to increase the vacuum degree of vacuum booster, shuts down threshold value until the vacuum degree reaches setting.
This method further include:
S5: according to the pressure difference of the current vacuum cavity pressure and the required vacuum chamber pressure, if the pressure difference
Greater than the second given threshold, then vacuum pump operating is controlled until the pressure difference is less than third given threshold.
In practical applications, the atmosphere pressure signal of controller for vacuum pump detection barometric pressure sensor output and opposite pressure
The atmospheric pressure and controller for vacuum pump differential pressure signal of sensor chip output, according to braking strategy authorized pressure difference signal
Value range.Work as brake pedal, vacuum degree deficiency in vacuum booster, controller for vacuum pump detects that pressure difference is less than the model
It encloses, controller for vacuum pump controls vacuum pump work, and when the value range that vacuum degree reaches in vacuum booster, vacuum pump stops work
Make.Atmospheric pressure value under Different Altitude is different, and controller for vacuum pump detects atmosphere pressure signal, according to controller for vacuum pump plan
Slightly, F2 pressure difference adjusts accordingly under different atmospheric pressure F1, combines vacuum pump vacuum capability, is guaranteeing Different Altitude
Lower vacuum boost system under failure conditions, does not meet brake pedal feel as far as possible.
This method further include:
S6: in the vacuum pump continuous running, if the current vacuum cavity pressure gradually reduces, judge that vacuum helps
There are vacuum leak failures for power device, and pass through CAN bus reporting fault message.
This method further include:
S7: the braking deceleration that electronic stabilizing control system is sent is obtained, and is determined and is increased according to the braking deceleration
Or reduce the running speed of vacuum pump, gradually to adjust the braking output pressure.
In practical applications, electronic stabilizing control system existing system, the control with vacuum servo integrate, energy
The utilization of electronic system is effectively increased, while electronic stabilizing control system can also be combined with the control of vacuum servo, vapour is made
Vehicle braking is more intelligent and convenient.
As it can be seen that the present invention provides a kind of control method of vacuum pump of electric automobile, pass through default environment atmospheric pressure and institute
It needs the relationship of vacuum chamber pressure to correspond to table, determines current vacuum cavity pressure and required vacuum chamber pressure, and then control vacuum pump fortune
Turn, incrementally increases vacuum chamber pressure.It solves existing electric car and vacuum pump control signal is obtained using pressure switch, exist easily
Damage, and the problem of power-assisted effect is unable to control under different atmospheric environments, the intelligence of vacuum pump control can be improved, electricity is improved
The safety and convenience that electrical automobile uses.
As shown in Fig. 2, the present invention also provides a kind of control systems of vacuum pump of electric automobile, comprising: atmospheric pressure sensing
Device, for obtaining external environment atmospheric pressure.First pressure sensor, for obtaining current vacuum cavity pressure.Second pressure
Sensor, for obtaining brake-pedal load.Controller for vacuum pump, for presetting environment atmospheric pressure and vacuum chamber pressure
Relationship correspond to table.And vacuum chamber pressure needed for table determines is corresponded to according to the relationship.The controller for vacuum pump is worked as described
When initial vacuum cavity pressure is less than required vacuum chamber pressure, control vacuum pump operating increases the pressure of vacuum chamber, works as until described
Initial vacuum cavity pressure reaches required vacuum chamber pressure.The controller for vacuum pump calculates vacuum also according to the brake-pedal load
The braking output pressure of booster controls vacuum pump if the braking output pressure is greater than the current vacuum cavity pressure
Operating, until the pressure of vacuum chamber is stepped up the braking output pressure.
Further, further includes: vacuum sensor, for obtaining the vacuum degree of vacuum booster.The vacuum pump control
For device when the vacuum degree is less than the first given threshold, control vacuum pump operating increases the vacuum degree of vacuum booster, until
The vacuum degree reaches setting and shuts down threshold value.
Further, the controller for vacuum pump is also used to according to the current vacuum cavity pressure and the required vacuum chamber
The pressure difference of pressure controls vacuum pump operating until the pressure difference is small if the pressure difference is greater than the second given threshold
In third given threshold.
The controller for vacuum pump is also used in the vacuum pump continuous running, if the current vacuum cavity pressure by
Step reduces, then judging vacuum booster, there are vacuum leak failures, and passes through CAN bus reporting fault message.
The controller for vacuum pump is also used to obtain the braking deceleration of electronic stabilizing control system transmission, and according to described
Braking deceleration determines the running speed for increasing or reducing vacuum pump, gradually to adjust the braking output pressure.
As it can be seen that the present invention provides a kind of control system of vacuum pump of electric automobile, by presetting ring in controller for vacuum pump
Border atmospheric pressure table corresponding with the relationship of required vacuum chamber pressure, determines current vacuum cavity pressure and required vacuum chamber pressure, into
And vacuum pump operating is controlled, incrementally increase vacuum chamber pressure.It solves existing electric car and vacuum pump is obtained using pressure switch
Signal is controlled, there are easy to damage, and the problem of power-assisted effect is unable to control under different atmospheric environments, vacuum pump control can be improved
Intelligence, improve the electric car safety and convenience that use.
Structure, feature and effect of the invention, the above institute is described in detail according to diagrammatically shown embodiment above
Only presently preferred embodiments of the present invention is stated, but the present invention does not limit the scope of implementation as shown in the drawings, it is all according to structure of the invention
Think made change or equivalent example modified to equivalent change, when not going beyond the spirit of the description and the drawings,
It should all be within the scope of the present invention.
Claims (10)
1. a kind of control method of vacuum pump of electric automobile characterized by comprising
Environment atmospheric pressure table corresponding with the relationship of vacuum chamber pressure is preset, external environment atmospheric pressure, and root are obtained
Vacuum chamber pressure needed for table determines is corresponded to according to the relationship；
Current vacuum cavity pressure is obtained, when the current vacuum cavity pressure is less than required vacuum chamber pressure, control vacuum pump fortune
Turn to increase the pressure of vacuum chamber, until the current vacuum cavity pressure reaches required vacuum chamber pressure；
Brake-pedal load is obtained, and calculates the braking output pressure of vacuum booster according to the brake-pedal load, if
The braking output pressure be greater than the current vacuum cavity pressure, then control vacuum pump operating, until vacuum chamber pressure gradually
Increase to the braking output pressure.
2. the control method of vacuum pump of electric automobile according to claim 1, which is characterized in that further include:
The vacuum degree for obtaining vacuum booster, when the vacuum degree is less than the first given threshold, control vacuum pump operating makes true
The vacuum degree of empty booster increases, and shuts down threshold value until the vacuum degree reaches setting.
3. the control method of vacuum pump of electric automobile according to claim 2, which is characterized in that further include:
According to the pressure difference of the current vacuum cavity pressure and the required vacuum chamber pressure, if the pressure difference is greater than second
Given threshold then controls vacuum pump operating until the pressure difference is less than third given threshold.
4. the control method of vacuum pump of electric automobile according to claim 3, which is characterized in that further include:
In the vacuum pump continuous running, if the current vacuum cavity pressure gradually reduces, judge that vacuum booster is deposited
In vacuum leak failure, and pass through CAN bus reporting fault message.
5. the control method of vacuum pump of electric automobile according to claim 4, which is characterized in that further include:
The braking deceleration that electronic stabilizing control system is sent is obtained, and is determined and is increased or reduced very according to the braking deceleration
The running speed of sky pump, gradually to adjust the braking output pressure.
6. a kind of control system of vacuum pump of electric automobile characterized by comprising
Barometric pressure sensor, for obtaining external environment atmospheric pressure；
First pressure sensor, for obtaining current vacuum cavity pressure；
Second pressure sensor, for obtaining brake-pedal load；
Controller for vacuum pump, for presetting environment atmospheric pressure table corresponding with the relationship of vacuum chamber pressure；And according to described
Relationship corresponds to vacuum chamber pressure needed for table determines；
When the current vacuum cavity pressure is less than required vacuum chamber pressure, control vacuum pump operating makes the controller for vacuum pump
The pressure of vacuum chamber increases, until the current vacuum cavity pressure reaches required vacuum chamber pressure,
The controller for vacuum pump calculates the braking output pressure of vacuum booster also according to the brake-pedal load, if institute
It states braking output pressure and is greater than the current vacuum cavity pressure, then vacuum pump operating is controlled, until the pressure of vacuum chamber gradually increases
It is added to the braking output pressure.
7. the control system of vacuum pump of electric automobile according to claim 6, which is characterized in that further include:
Vacuum sensor, for obtaining the vacuum degree of vacuum booster；
For the controller for vacuum pump when the vacuum degree is less than the first given threshold, control vacuum pump operating makes vacuum booster
Vacuum degree increase, shut down threshold value until the vacuum degree reaches setting.
8. the control system of vacuum pump of electric automobile according to claim 7, which is characterized in that the controller for vacuum pump
It is also used to the pressure difference according to the current vacuum cavity pressure and the required vacuum chamber pressure, if the pressure difference is greater than the
Two given thresholds then control vacuum pump operating until the pressure difference is less than third given threshold.
9. the control system of vacuum pump of electric automobile according to claim 8, which is characterized in that the controller for vacuum pump
It is also used in the vacuum pump continuous running, if the current vacuum cavity pressure gradually reduces, judges vacuum booster
There are vacuum leak failures, and pass through CAN bus reporting fault message.
10. the control method of vacuum pump of electric automobile according to claim 9, which is characterized in that the vacuum pump control
Device is also used to obtain the braking deceleration of electronic stabilizing control system transmission, and is determined according to the braking deceleration and increase or subtract
The running speed of small vacuum pump, gradually to adjust the braking output pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811554832.2A CN109484387B (en) | 2018-12-19 | 2018-12-19 | Control method and system for vacuum pump of electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811554832.2A CN109484387B (en) | 2018-12-19 | 2018-12-19 | Control method and system for vacuum pump of electric vehicle |
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| CN109484387A true CN109484387A (en) | 2019-03-19 |
| CN109484387B CN109484387B (en) | 2021-02-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111497810A (en) * | 2020-04-19 | 2020-08-07 | 东风汽车集团有限公司 | Control system and control method for brake vacuum pump of electric automobile |
| CN111959472A (en) * | 2020-08-31 | 2020-11-20 | 安徽江淮汽车集团股份有限公司 | Electric automobile vacuum pump redundancy control system and method and electric automobile |
| CN112924107A (en) * | 2021-01-29 | 2021-06-08 | 江铃汽车股份有限公司 | Method and system for detecting sealing performance of vacuum booster |
| CN113635883A (en) * | 2021-08-30 | 2021-11-12 | 中国第一汽车股份有限公司 | Environment pressure detection system and method for vacuum boosting system of electric automobile |
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| CN109484387B (en) | 2021-02-02 |
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Address after: 230601 No. 99 Ziyun Road, Hefei Economic and Technological Development Zone, Anhui Province Applicant after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230601 No. 669 Shixin Road, Taohua Industrial Park, Hefei City, Anhui Province Applicant before: Anhui Jianghuai Automobile Group Limited by Share Ltd |
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