CN101927761B - Vacuum boosting braking system for pure electric vehicle and control method - Google Patents
Vacuum boosting braking system for pure electric vehicle and control method Download PDFInfo
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- CN101927761B CN101927761B CN 201010296300 CN201010296300A CN101927761B CN 101927761 B CN101927761 B CN 101927761B CN 201010296300 CN201010296300 CN 201010296300 CN 201010296300 A CN201010296300 A CN 201010296300A CN 101927761 B CN101927761 B CN 101927761B
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Abstract
The invention provides an electric vacuum boosting braking system for a pure electric vehicle and a control method thereof. The control system comprises a braking pedal, a vacuum booster, a vacuum valve, a vacuum energy storage tank, a relay and a vehicle control unit. The control process comprises that: the vehicle control unit acquires a signal of a vacuum pressure switch to judge whether the vacuum degree in the vacuum energy storage tank meets the requirement or not according to the on/off condition of the vacuum pressure switch, wherein if the switch is off, the acquired signal of the vehicle control unit is 0, and if the switch is on, the acquired signal of the vehicle control unit is 1; and then the vehicle control unit controls the vacuum pump to work or stop working. Once the electric vehicle is electrified, a vacuum boosting process starts to circle repeatedly and automatically to have a substantially equivalent boosting effect with that of the traditional vehicles through detection. Adopting a mechanical vacuum pressure switch, the control system has a simple structure, a low cost and a reliable and durable design.
Description
Technical field
The invention belongs to the brake system of car technology, be specifically related to the vacuum-assisted control technology of automobile.
Background technology
Pure electric automobile has become the new-energy automobile that is expected most after internal-combustion engines vehicle, each big automobile enterprise of each government and the whole world one after another all battery-driven car as the development in future direction, next a century in the new century, as if can not make an exception as the China that has global maximum automotive market, no matter be government, or business circles, battery-driven car has become the most popular topic.
Most cars adopt the vacuum servo servo braking system more, being manpower and power and using of employing.The vacuum source of the brake system vacuum booster unit of traditional combustion engine car comes from engine suction manifold, and the degree of vacuum negative pressure can reach 0.05-0.07Mpa.For the pure electric vehicle that is repacked into by traditional vehicle, after engine assembly is removed, only the braking force that is produced by manpower can't satisfy the needs of travelling brake, therefore need change a social system the brake system vacuum booster unit, and the key problem of the transformation of the way is the vacuum source that produces enough pressure.
Summary of the invention
Purpose of the present invention just provides electric vacuum booster brake system and the control method of using on a kind of suitable pure electric automobile thereof.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of pure electric automobile electric vacuum booster control system, it comprises brake pedal, vacuum booster, vacuum pump, vacuum energy storage canister, relay and entire car controller, described vacuum booster is connected with the vacuum energy storage canister with brake pedal respectively, vacuum pump is connected with described vacuum booster by the vacuum energy storage canister, be provided with pressure switch in the vacuum energy storage canister, pressure switch is connected with entire car controller respectively with vacuum pump; Relay one end connects the 12V power supply, and the other end connects the vacuum pump positive pole, and vacuum pump directly links to each other with the vacuum energy storage canister, and positive source connects pressure switch, and the direct ground connection of negative pole provides power supply by the 12V storage battery; Described control setup is by the degree of vacuum in the pressure switch test vacuum energy storage canister, when the vacuum energy storage canister is lower than a certain degree of vacuum, and the pressure switch closure, and this signal delivered to entire car controller, the work of vehicle control unit controls vacuum pump.
The present invention further also proposes to utilize said system to carry out the method for pure electric automobile electric vacuum booster control, and it may further comprise the steps:
Gather the pressure switch signal by entire car controller earlier, and judge according to the signal that collects whether degree of vacuum meets the demands in the vacuum energy storage canister; The switch value of the pressure switch of vacuum energy storage canister is to set according to the requirement of car load brake system, degree of vacuum when pressure switch is closed in the vacuum energy storage canister is less than 60KPa, this moment entire car controller to detect signal be 1, when pressure switch is opened, degree of vacuum in the vacuum energy storage canister is greater than 80KPa, this moment entire car controller to detect signal be 0;
After entire car controller collects the pressure switch signal, also to judge the numeral output of control entire car controller according to the voltage condition of storage battery; When the numeral of pressure switch signal is input as 1, and battery tension is greater than 12V, and then the numeral of entire car controller is output as 1; When the numeral of pressure switch signal is input as 0, then control figure is output as 0;
At last, the adhesive that entire car controller removes relay by digital output signal control is output as at 1 o'clock, and the relay adhesive is output as at 0 o'clock, and relay is opened; Relay one end connects the 12V power supply, and the other end connects the vacuum pump positive pole, and vacuum pump is started working during the relay adhesive, and when relay was opened, vacuum pump quit work.
The designed technical scheme of the present invention effect that has the following advantages:
(1) adopt mechanical vacuum pressure switch, simple in structure, cost is lower;
(2) system's reliable design is durable.
Description of drawings
Fig. 1, vacuum servo control principle block diagram.
Fig. 2, control system fundamental diagram.
Among the figure: 1, positive 2, the insurance 3 of power supply, relay 4, vacuum pump 5, vacuum energy storage canister 6, entire car controller
The specific embodiment
Referring to Fig. 1, the electric vacuum booster brake system comprises the electric vacuum booster device that links to each other with brake pedal, vacuum energy storage canister, vacuum pump, pressure switch and entire car controller.
1,1 electric vacuum booster device
Vacuum booster is installed between brake pedal and the master brake cylinder, passes through the push rod direct control by brake pedal.The power that vacuum booster and brake pedal produce is superimposed and acts on the master brake cylinder push rod, to improve the delivery pressure of master brake cylinder.The servo vacuum air chamber of vacuum booster is divided into normal pressure chamber and transformation chamber by the piston that has sheet rubber (or dividing plate).The indoor degree of vacuum of transformation is generally 60-80Kpa, is directly provided by the vacuum energy storage canister.The vacuum energy storage canister is connected with vacuum pump, and by the vacuum pump extracting vacuum, vacuum pump links to each other with vehicle 12V power-supply battery.
In the electric vacuum booster device, counter-force mechanism is arranged between input bar and valve body and the take-off lever, this valve body links into an integrated entity with helping from the device piston, valve piston is installed on the input piston that connects the input bar, and counter-force mechanism relatively input piston from predetermined retracted position to front slide, valve piston is biased into retracted position by spring is set, and blocking device is arranged between valve piston and the valve body post, in order to valve piston is locked on the valve body cylinder.
1.2 vacuum energy storage canister and pressure switch
The vacuum energy storage canister is the device that low pressure source is provided for the low-pressure chamber of vacuum booster, and internal vacuum need remain on 60-80KPa.One pressure switch is arranged in the vacuum energy storage canister, after air pressure is lower than a certain value, the pressure switch auto-closing, and signal passed to entire car controller.When degree of vacuum was higher than a certain value, the pressure switch automatic cutout passed to entire car controller with signal.The switch value of the pressure switch of vacuum energy storage canister is to set according to the requirement of car load brake system.
1.3 vacuum pump and entire car controller
Vacuum pump is by drawing the air in the vacuum energy storage canister, and controller provides the degree of vacuum that needs for the vacuum accumulator, and it is started working by vehicle control unit controls.Entire car controller is the core controller of whole pure electric automobile, and controller is judged the electric weight of storage battery and the situation of degree of vacuum by measuring battery tension, by the work of a relay control vacuum pump.
Figure 2 shows that vacuum servo formula (Direct Action Type) the servo brake system loop diagram of pure electric automobile, it has adopted the near front wheel brake cylinder and off hind wheel brake cylinder is that a hydraulic circuit, off front wheel brake cylinder and left rear wheel brake cylinder are the layout of another hydraulic circuit, is the double circuit hydraulic braking system that diagonal line is arranged.The vacuum booster of vacuum booster air chamber and control cock combination produces thrust when work, also equally act directly on the piston push rod of master brake cylinder with treadle effort.
2, system's control process:
The electric vacuum booster system in the course of the work, entire car controller is gathered the vacuum pressure switch signal, closure by vacuum pressure switch is opened, judge whether the degree of vacuum in the vacuum energy storage canister can meet the demands, if switch disconnects, it is 0 that entire car controller is gathered signal, is 1 if the switch closure entire car controller is gathered signal.Vehicle control unit controls vacuum pump work or stop then.As long as electronlmobil powers on, vacuum-assisted process just begins to circulate automatically repeatedly, and the power-assisted effect with orthodox car is suitable after testing.
Detailed process is as follows:
Gather the pressure switch signal by entire car controller earlier, and judge according to the signal that collects whether degree of vacuum meets the demands in the vacuum energy storage canister.The switch value of the vacuum pressure switch of vacuum energy storage canister is to set according to the requirement of car load brake system, degree of vacuum when taking seriously pneumatics power switch closure in the vacuum energy storage canister is less than 60KPa, this moment entire car controller to detect signal be 1, when taking seriously pneumatics power switch open, degree of vacuum in the vacuum energy storage canister is greater than 80KPa, this moment entire car controller to detect signal be 0.
Entire car controller is output as at 1 o'clock, the relay adhesive by the adhesive of a digital output signal control relay.Be output as at 0 o'clock, relay is opened.Relay one end connects the 12V power supply, and the other end connects the vacuum pump positive pole, and vacuum pump is started working during the relay adhesive, and when relay was opened, vacuum pump quit work.
After entire car controller collects the pressure switch signal, judge according to the voltage condition of storage battery, control its numeral output.When numeral is input as 1, and battery tension is greater than 12V, and then the controller numeral is output as 1.When numeral is input as 0, then control figure is output as 0.
Vacuum pump directly links to each other with the vacuum energy storage canister, and positive source connects insurance and pressure switch, and the direct ground connection of negative pole provides power supply by the 12V storage battery.
Claims (1)
1. pure electric automobile electric vacuum booster control system, it is characterized in that: comprise brake pedal, vacuum booster, vacuum pump, vacuum energy storage canister, relay and entire car controller, described vacuum booster is connected with the vacuum energy storage canister with brake pedal respectively, vacuum pump is connected with described vacuum booster by the vacuum energy storage canister, be provided with pressure switch in the vacuum energy storage canister, pressure switch is connected with entire car controller respectively with vacuum pump; Relay one end connects the 12V power supply, and the other end connects the vacuum pump positive pole, and vacuum pump directly links to each other with the vacuum energy storage canister, and the 12V positive source connects pressure switch, and the direct ground connection of negative pole provides power supply by the 12V storage battery; Described control system is by the degree of vacuum in the pressure switch test vacuum energy storage canister, when the degree of vacuum of vacuum energy storage canister is lower than a certain degree of vacuum, and the pressure switch closure, and the pressure switch signal delivered to entire car controller, the work of vehicle control unit controls vacuum pump;
It is as follows to utilize described system to carry out the method for pure electric automobile electric vacuum booster control:
Gather the pressure switch signal by entire car controller earlier, and judge according to the signal that collects whether degree of vacuum meets the demands in the vacuum energy storage canister; The switch value of the pressure switch of vacuum energy storage canister is to set according to the requirement of car load brake system, degree of vacuum when pressure switch is closed in the vacuum energy storage canister is less than 60KPa, this moment entire car controller to detect signal be 1, when pressure switch is opened, degree of vacuum in the vacuum energy storage canister is greater than 80KPa, this moment entire car controller to detect signal be 0;
After entire car controller collects the pressure switch signal, also to judge the numeral output of control entire car controller according to the voltage condition of storage battery; When the numeral of pressure switch signal is input as 1, and battery tension is greater than 12V, and then the numeral of entire car controller is output as 1; When the numeral of pressure switch signal is input as 0, then control figure is output as 0;
At last, the adhesive that the signal that entire car controller is exported by a numeral removes control relay, numeral is output as at 1 o'clock, the relay adhesive, numeral is output as at 0 o'clock, and relay is opened; Relay one end connects the 12V power supply, and the other end connects the vacuum pump positive pole, and vacuum pump is started working during the relay adhesive, and when relay was opened, vacuum pump quit work.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010296300 CN101927761B (en) | 2010-09-29 | 2010-09-29 | Vacuum boosting braking system for pure electric vehicle and control method |
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| CN 201010296300 CN101927761B (en) | 2010-09-29 | 2010-09-29 | Vacuum boosting braking system for pure electric vehicle and control method |
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| CN101927761B true CN101927761B (en) | 2013-09-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104118420A (en) * | 2014-07-30 | 2014-10-29 | 重庆长安汽车股份有限公司 | Fault diagnosis method for blade electric vehicle vacuum assistance brake system |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011077107A1 (en) * | 2011-06-07 | 2012-12-13 | Robert Bosch Gmbh | Replacement circuit for activation of an electric vacuum pump in the event of a controller failure |
| CN102490714B (en) * | 2011-12-12 | 2013-12-11 | 中联重科股份有限公司 | Vacuum power-assisted braking system of electric automobile and control method thereof |
| CN107499298A (en) * | 2017-09-13 | 2017-12-22 | 无锡商业职业技术学院 | A kind of vacuum control unit for braking system of electric car |
| CN108791257A (en) * | 2018-07-23 | 2018-11-13 | 四川江淮汽车有限公司 | A kind of electric vacuum pump control circuit of electronic cargo vehicle |
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- 2010-09-29 CN CN 201010296300 patent/CN101927761B/en active Active
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| DE2022444A1 (en) * | 1970-05-08 | 1971-11-25 | Opel Adam Ag | Brake system for motor vehicles |
| EP1123848A1 (en) * | 2000-02-10 | 2001-08-16 | Peugeot Citroen Automobiles SA | Brake device with improved pedal feeling and connected method |
| JP4189664B2 (en) * | 2003-09-29 | 2008-12-03 | 株式会社デンソー | Electric power steering control device |
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Application publication date: 20101229 Assignee: CHONGQING CHANGAN NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. Assignor: Chongqing Changan Automobile Co.,Ltd.|CHONGQING CHANG'AN NEW ENERGY AUTOMOBILE Co.,Ltd. Contract record no.: 2018500000018 Denomination of invention: Vacuum boosting braking system for pure electric vehicle and control method Granted publication date: 20130911 License type: Exclusive License Record date: 20181121 |
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Effective date of registration: 20190107 Address after: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee after: CHONGQING CHANGAN NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. Address before: 400023, No. 260, Jianxin East Road, Jiangbei District, Chongqing Co-patentee before: CHONGQING CHANG'AN NEW ENERGY AUTOMOBILE Co.,Ltd. Patentee before: Chongqing Changan Automobile Co.,Ltd. |
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Address after: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee after: Deep Blue Automotive Technology Co.,Ltd. Address before: 401133 room 208, 2 house, 39 Yonghe Road, Yu Zui Town, Jiangbei District, Chongqing Patentee before: CHONGQING CHANGAN NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |
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