CN110435618A - A kind of brake of electric vehicle digital electric vacuum assistance system for taking into account altitude environment - Google Patents
A kind of brake of electric vehicle digital electric vacuum assistance system for taking into account altitude environment Download PDFInfo
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- CN110435618A CN110435618A CN201910778032.7A CN201910778032A CN110435618A CN 110435618 A CN110435618 A CN 110435618A CN 201910778032 A CN201910778032 A CN 201910778032A CN 110435618 A CN110435618 A CN 110435618A
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- vacuum
- electric
- vacuum pump
- control unit
- electronic control
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Classifications
-
- 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
- B60T13/24—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
- B60T13/569—Vacuum systems indirect, i.e. vacuum booster units characterised by piston details, e.g. construction, mounting of diaphragm
-
- 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
Abstract
The present invention provides a kind of brake of electric vehicle digital electric vacuum assistance system for taking into account altitude environment, belong to brake of electric vehicle technical field, the program is made of electronic control unit, barometric pressure sensor, relay, battery, electric vacuum pump, check valve, vacuum booster, vacuum tank, vacuum sensor；Electronic control unit judges the height above sea level in running car area according to the atmospheric pressure value that barometric pressure sensor exports, when electronic control unit judges running car in highlands, and when reaching required threshold value by the vacuum degree that vacuum sensor measures, electronic control unit controls the circuit connection between relay delay cutoff battery and electric vacuum pump, to provide sufficient vacuum degree for vacuum tank, this is conducive to overcome highlands because the problems such as brake efficiency is poor caused by vacuum degree deficiency, it increases substantially vehicle braking and feels consistency, have integrated level high in the system structure simultaneously, reaction speed is fast, the advantages of good airproof performance.
Description
Technical field
The invention belongs to brake of electric vehicle technical fields, and in particular to a kind of brake of electric vehicle electricity consumption for taking into account altitude environment
Dynamic vacuum boost system.
Background technique
With gradually increasing for vehicles number, environmental pollution and petroleum resources scarcity are increasingly significant, and electric car is because of it
Have many advantages, such as that environmentally protective and efficiency of energy utilization is high, this makes countries in the world all actively hardy research can replace passing
The electric vehicle of system automobile；Electric car also becomes the important directions of China's development of automobile simultaneously.
With the raising that people require automobile braking safety and comfort, vacuum-assisted brake similar with traditional vehicle
System is also that must installing for electric vehicle is standby, but the difference of the two is, brake vacuum source is mainly provided by engine in traditional vehicle,
And after electric vehicle cancels engine, vacuum source is mainly provided by digital electric vacuum assistance system, therefore the direct shadow of quality of its performance
Ring braking performance of vehicle or even vehicle economy, electric vacuum brake assisting system become electric vehicle crucial electrical accessory it
One.
The assist characteristic of vacuum boost system depend on Vacuum booster diaphragm two sides air pressure size, i.e., atmospheric pressure with
The difference of vacuum room's pressure, the difference determine the brake feel of braking system, and with the change of running car region height above sea level
Change, atmospheric pressure can also change, and how guarantee that the consistency of brake efficiency and brake feel becomes electric vehicle in height at this time
Apply the critical issue to be solved in original area.
Summary of the invention
The present invention is in view of the above-mentioned problems, propose a kind of brake of electric vehicle for taking into account altitude environment electric vacuum booster system
System, technology contents are as follows:
A kind of brake of electric vehicle digital electric vacuum assistance system that taking into account altitude environment is by electronic control unit (1), atmospheric pressure
Sensor (2), relay (3), battery (4), electric vacuum pump (5), check valve (6), vacuum booster (13), vacuum tank
(17), vacuum sensor (18) forms, it is characterised in that.
Vacuum sensor (18) are fixedly installed on the inner wall of vacuum tank (17).
Barometric pressure sensor (2) and vacuum sensor (18) pass through signal wire and electronic control unit (1) respectively
Any two-way AD sample circuit is connected.
Battery (4) is connected by circuit with electric vacuum pump (5), and relay (3) is connected in series in the circuit loop.
The control terminal of relay (3) is connected with any I/O circuit all the way of electronic control unit (1), electronic control unit
(1) pass through the disconnection and closure of corresponding I/O Interface Controller relay (3).
It is connect between electric vacuum pump (5) and vacuum tank (17) by check valve (6), check valve (6) passes through one-way valve
Internal screw thread on body (30) is connect with the external screw thread on vacuum tank air outlet (22)；Electric vacuum pump air inlet port (23) passes through
Screw thread is fixedly connected with the internal screw thread of vacuum tank air outlet (22)；Gas can only flow into electric vacuum pump by vacuum tank (17)
(5)。
Vacuum tank air inlet port (16) has external screw thread, is fixedly connected with any end of vacuum connector pipe (15)；Very
The other end of empty connecting line (15) is fixedly connected with the vacuum booster power-assisted port (14) of vacuum booster (13).
Electronic control unit (1) judges running car area according to the atmospheric pressure value that barometric pressure sensor (2) exports
Height above sea level；When running car is at non-highlands, if reached by the vacuum degree that vacuum sensor (18) measures
When required threshold value, electronic control unit (1) controls the circuit between relay (3) cutting battery (4) and electric vacuum pump (5)
Connection, electric vacuum pump (5) stop working；When running car is at highlands, if measured by vacuum sensor (18)
Vacuum degree when reaching required threshold value, electronic control unit (1) control relay (3) delay cutoff battery (4) with it is electronic
Circuit connection between vacuum pump (5).
The delay cutoff time of control relay (3) is determined by following formula:
In formula, t is height above sea level when being h, controls the delay cutoff time of relay (3)；KqTo be pressed when being evacuated and terminate with equipment
Strong related correction factor, takes 1 herein；VzFor the volume of vacuum booster vacuum chamber (7)；VgFor vacuum tank (17) volume；SpFor
The nominal speed of exhaust of electric vacuum pump (5)；DmFor master cylinder internal diameter；PmIt is hydraulic for master cylinder；FpBraking is stepped on for driver
When brake pedal force；ipFor brake pedal lever ratio；D is the effective diameter of Vacuum booster diaphragm (8)；P0For plains region
Atmospheric pressure；PhAtmospheric pressure when for height above sea level being h；△ P is the pressure difference of Vacuum booster diaphragm (8) two sides.
Plain environment and altitude environment cannot be taken into account well for pure electric automobile electric vacuum booster braking system
The problems such as demand, proposes a kind of brake of electric vehicle digital electric vacuum assistance system for taking into account altitude environment, the system and existing side
Case is compared and is had the advantages that
1) system using barometric pressure sensor (2) detect external atmosphere pressure, when detect vehicle driving in highlands, and
When vacuum tank (17) interior vacuum degree reaches required upper threshold, electronic control unit (1) controls relay (3) delay and disconnects, and makes
Electric vacuum pump (5) delay working, and according to different external atmosphere pressures, electric vacuum pump (5) delay different time is controlled, from
And be that vacuum tank (17) provide sufficient vacuum degree, be conducive to overcome the brake efficiency as caused by the vacuum degree deficiency of highlands
The problems such as poor, increases substantially vehicle braking and feels consistency.
2) electric vacuum pump (5) is connected through a screw thread with vacuum tank (17), and check valve (6) are housed therebetween, this has
Effect shortens the gas circuit between electric vacuum pump (5) and vacuum tank (17), high with level of integrated system, space-saving advantage,
And it can effectively improve the respond of electric vacuum pump (5) and the speed of exhaust of electric vacuum pump (5), avoid intake and exhaust
Energy loss and hysteresis in journey, to effectively ensure the sensitivity and safety of braking of battery electric vehicle；It is electronic true
It is all made of between sky pump (5) and vacuum tank (17) and between vacuum tank (17) and check valve (6) and is threadedly coupled, structure is simple, adds
Work is convenient, good seal performance；Check valve (6) are set between electric vacuum pump (5) and vacuum tank (17), it is ensured that pumping direction is just
Really, it prevents vacuum from flowing backwards, effectively increases the leakproofness of vacuum tank (17).
Detailed description of the invention
Fig. 1 is a kind of electronic vacuum power system principle figure of brake of electric vehicle for taking into account altitude environment.
Fig. 2 is the installation diagram of electric vacuum pump and vacuum tank.
Fig. 3 is electric vacuum pump cross-sectional view.
Fig. 4 is electric vacuum pump A-A direction view.
Fig. 5 is electric vacuum pump B-B direction view.
Fig. 6 is electric vacuum pump C-C direction view.
Fig. 7 is electric vacuum pump D-D direction view.
Fig. 8 is vacuum tank cross-sectional view.
Fig. 9 is check valve cross-sectional view.
In figure, 1. electronic control units；2. barometric pressure sensor；3. relay；4. battery；5. electric vacuum pump；
6. check valve；7. vacuum booster vacuum chamber；8. Vacuum booster diaphragm；9. vacuum booster atmospheric chamber；10. vacuum booster
Atmos-valve；11. brake pushrod；12. brake pedal；13. vacuum booster；14. vacuum booster power-assisted port；15. vacuum connects
Take over road；16. vacuum tank air inlet port；17. vacuum tank；18. vacuum sensor；19. inner elements of check valve；20. check valve bullet
Spring；21. one-way valve spring pedestal；22. vacuum tank air outlet；23. electric vacuum pump air inlet port；24. Motorized vacuum pump case
Body；25. Motorized vacuum pump rotor；26. electric vacuum pump exhaust port；27. bolt；28. Motorized vacuum pump motor；29. electronic
Vaccum pump motor shell boss；30. check valve valve body；31. vacuum tank shell；32. the first blade of electric vacuum pump；33. electronic
Vacuum pump the first blade spring；34. electric vacuum pump motor shaft；35. Motorized vacuum pump rotor installation key；36. electric vacuum pump
Second blade；37. electric vacuum pump the second blade spring；38. electric vacuum pump the second blade mounting groove；39. electric vacuum pump
First blade mounting groove.
Specific embodiment
A kind of brake of electric vehicle digital electric vacuum assistance system that taking into account altitude environment is by electronic control unit (1), atmosphere
Pressure sensor (2), relay (3), battery (4), electric vacuum pump (5), check valve (6), vacuum booster (13), vacuum
Tank (17), vacuum sensor (18) composition.
Electronic control unit (1) judges running car area according to the atmospheric pressure value that barometric pressure sensor (2) exports
Height above sea level；When running car is at non-highlands, if reached by the vacuum degree that vacuum sensor (18) measures
When required threshold value, electronic control unit (1) controls the circuit between relay (3) cutting battery (4) and electric vacuum pump (5)
Connection, electric vacuum pump (5) stop working；When running car is at highlands, if measured by vacuum sensor (18)
Vacuum degree when reaching required threshold value, electronic control unit (1) control relay (3) delay cutoff battery (4) with it is electronic
Circuit connection between vacuum pump (5), delay time are calculated according to environment and motor vehicle braking system relevant parameter and are determined.
In conjunction with attached drawing, to the structure and work of a kind of brake of electric vehicle digital electric vacuum assistance system for taking into account altitude environment
Process is described below.
As shown in Fig. 2, being fixedly installed with vacuum sensor (18) on the inner wall of vacuum tank (17).
As shown in Figure 1, barometric pressure sensor (2) and vacuum sensor (18) pass through signal wire and electronic control respectively
Any two-way AD sample circuit of unit (1) is connected.
As shown in Figure 1, battery (4) is connected by circuit with electric vacuum pump (5), relay (3) is connected in series in this
In circuit loop.
Any I/O circuit output interface all the way that the control terminal of relay (3) passes through signal wire and electronic control unit (1)
It is connected, electronic control unit (1) passes through the disconnection and closure of corresponding I/O Interface Controller relay (3)；When in vacuum tank (17)
When vacuum degree is less than target value, electronic control unit (1) controls relay (3) closure, electric vacuum pump (5) work；Work as vacuum
When vacuum degree in tank (17) is greater than target value, electronic control unit (1) controls relay (3) and disconnects, and electric vacuum pump (5) stops
Only work.
As shown in Figure 1, 2, it is connect between electric vacuum pump (5) and vacuum tank (17) by check valve (6), check valve (6)
(such as Fig. 9 is formed by inner elements of check valve (19), one-way valve spring (20), one-way valve spring pedestal (21) and check valve valve body (30)
It is shown)；Check valve (6) is connected by the internal screw thread on check valve valve body (30) and the external screw thread on vacuum tank air outlet (22)
It connects；Electric vacuum pump air inlet port (23) is fixedly connected by screw thread with the internal screw thread of vacuum tank air outlet (22)；To control
Gas processed can only flow into electric vacuum pump (5) by vacuum tank (17), cannot reversely circulate.
As shown in Fig. 2~7, electric vacuum pump (5) by Motorized vacuum pump motor (28) and vacuum pump group at；Vacuum pump is by electricity
Dynamic vacuum pump air inlet port (23), Motorized vacuum pump case (24), Motorized vacuum pump rotor (25), the first blade of electric vacuum pump
(32), the first blade of electric vacuum pump spring (33), the second blade of electric vacuum pump (36), electric vacuum pump the second blade spring
(37), the first blade of electric vacuum pump mounting groove (39), electric vacuum pump the second blade mounting groove (39) and electric vacuum pump row
Gas port (26) composition；Motorized vacuum pump rotor (25) is installed with electric vacuum pump motor shaft (34) by Motorized vacuum pump rotor
Key (35) is fixedly connected；The first blade of electric vacuum pump (32) and electric vacuum pump the first blade spring (33) are mounted on electronic true
In sky the first blade mounting groove (39) of pump, after installation, electric vacuum pump the first blade spring (33) is in compressive state, will be electronic
The first blade of vacuum pump (32) presses to the inner wall of Motorized vacuum pump case (24), can when Motorized vacuum pump rotor (25) rotate
Realize scavenging；The second blade of electric vacuum pump (36) and electric vacuum pump the second blade spring (37) are mounted on electric vacuum pump
In two blade mounting grooves (38), after installation, electric vacuum pump the second blade spring (37) is in compressive state, by electric vacuum pump
Second blade (36) presses to the inner wall of Motorized vacuum pump case (24), when Motorized vacuum pump rotor (25) rotate, it can be achieved that sweeping
Gas；Motorized vacuum pump case (24) is fixedly connected with electric vacuum pump electric machine casing boss (29) by three bolts (27)；Electricity
Dynamic vacuum pump air inlet port (23) are fixedly connected by screw thread with the internal screw thread of vacuum tank air outlet (22).
As shown in Fig. 2,8, vacuum tank (17) has vacuum tank air outlet (22) and vacuum tank air inlet port (16), vacuum
Canister incoming gas port (16) has external screw thread, is fixedly connected with one end of vacuum connector pipe (15)；Vacuum tank air outlet (22)
With internal screw thread and external screw thread, external screw thread is connect with being threadedly engaged for check valve (6), internal screw thread and electric vacuum pump air inlet port
(23) external screw thread on is cooperatively connected.
As shown in Figure 1, 2, any end of vacuum connector pipe (15) is connect with vacuum tank air inlet port (16), the other end
It is connect with the vacuum booster power-assisted port (14) of vacuum booster (13).
As shown in Figure 1, vacuum booster (13) is by vacuum booster atmospheric chamber (9), Vacuum booster diaphragm (8) and vacuum
Booster vacuum room (7) composition；When brake pedal, vacuum booster atmospheric chamber (9) can pass through vacuum booster atmos-valve
(10) it is communicated with atmosphere；When non-brake pedal, vacuum booster atmospheric chamber (9) is communicated with vacuum booster vacuum chamber (7),
And it is separated by vacuum booster atmos-valve (10) with atmosphere；Vacuum booster vacuum chamber (7) passes through vacuum booster power-assisted end
Mouth (14) is connected with vacuum connector pipe (15), and Vacuum booster diaphragm (8) is fixedly connected with brake pushrod (11)；Brake pushrod
(11) it is hinged with brake pedal (12)；When brake pedal, pass through vacuum booster atmospheric chamber (9) and vacuum booster
Pressure difference between vacuum chamber (7) realizes brake boost function, and when running car is at high altitude localities, vacuum booster is big
Air pressure in gas chamber (9) can be less than the air pressure of plains region, at this time if the vacuum degree in vacuum booster vacuum chamber (7) is kept
It is constant, then it will appear the problem of vacuum servo deficiency, need accordingly to change electric vacuum pump (5) according to height above sea level at this time
Working time, accordingly to reduce the vacuum degree in vacuum chamber, to guarantee that the power-assisted effect of vacuum booster (13) is constant, in turn
Guarantee the consistency of vehicle brake feel.
The delay time that relay (3) disconnect is controlled, i.e. the working time of electric vacuum pump (5) is determined by following formula:
In formula, t is height above sea level when being h, controls the delay cutoff time of relay (3)；KqTo be pressed when being evacuated and terminate with equipment
Strong related correction factor, takes 1 herein；VzFor the volume of vacuum booster vacuum chamber (7)；VgFor vacuum tank (17) volume；SpFor
The nominal speed of exhaust of electric vacuum pump (5)；DmFor master cylinder internal diameter；PmIt is hydraulic for master cylinder；FpBraking is stepped on for driver
When brake pedal force；ipFor brake pedal lever ratio；D is the effective diameter of Vacuum booster diaphragm (8)；P0For plains region
Atmospheric pressure；PhAtmospheric pressure when for height above sea level being h；△ P is the pressure difference of Vacuum booster diaphragm (8) two sides.
Specific work process is as follows:
After electric car key switch gets to ON grades, electronic control unit (1) reception is exported by barometric pressure sensor (2)
The vacuum tank vacuum degree of atmospheric value and vacuum sensor (18) output；Electronic control unit (1) is sentenced according to atmospheric value
It cuts steam the height above sea level of vehicle their location, and obtains required vacuum tank target vacuum angle value and turn off the delay of relay (3)
Time, the delay time are calculated according to the parameter of Vehicular system relevant parameter and local environment and are determined.
In formula, t is height above sea level when being h, controls the delay cutoff time of relay (3)；KqIt is terminated to be evacuated with equipment
When the related correction factor of pressure, take 1 herein；VzFor the volume of vacuum booster vacuum chamber (7)；VgFor vacuum tank (17) volume；
SpFor the nominal speed of exhaust of electric vacuum pump (5)；DmFor master cylinder internal diameter；PmIt is hydraulic for master cylinder；FpIt is stepped on for driver
Brake pedal force when braking；ipFor brake pedal lever ratio；D is the effective diameter of Vacuum booster diaphragm (8)；P0For Plain
The atmospheric pressure in area；PhAtmospheric pressure when for height above sea level being h；△ P is the pressure difference of Vacuum booster diaphragm (8) two sides.
When running car is in plains region, and the vacuum tank vacuum degree of vacuum sensor (18) output is less than vacuum tank
When target vacuum angle value, electronic control unit (1) controls relay (3) closure, and battery (4) is powered to electric vacuum pump (5),
Motorized vacuum pump motor (28) drives Motorized vacuum pump rotor (25) rotation by Motorized vacuum pump rotor installation key (35), passes through
The first blade of electric vacuum pump (32) and the second blade of electric vacuum pump (36) are by the gas in electric vacuum pump air inlet port (23)
Body takes at electric vacuum pump exhaust port (26), and is discharged into atmosphere, the specific route of gas flowing are as follows: vacuum booster vacuum
Gas in room (7) enters vacuum tank (17) by vacuum connector pipe (15) and vacuum tank air inlet port (16), by unidirectional
Valve (6), vacuum tank air outlet (22) enter electric vacuum pump air inlet port (23), arrange through electric vacuum pump exhaust port (26)
Enter atmosphere, so that vacuum tank vacuum degree be made to increase.
When running car is in plains region, and the vacuum tank vacuum degree of vacuum sensor (18) output be more than or equal to it is true
When slack tank target vacuum angle value, electronic control unit (1) controls relay (3) and disconnects, and battery (4) does not give electric vacuum pump
(5) it powers, electric vacuum pump (5) does not work, and the air pressure at electric vacuum pump air inlet port (23) is equal to atmospheric pressure, is greater than vacuum
When pressure in tank (17), under the action of check valve (6), vacuum tank (17) is in sealing state, so as to keep vacuum
It spends constant.
When running car is at highlands, the course of work of electric vacuum pump (5) is similar with plains region, but works as vacuum
When spending the vacuum tank vacuum degree of sensor (18) output more than or equal to vacuum tank target vacuum angle value, electronic control unit (1)
It controls relay (3) delay to disconnect, the relating to parameters of delay time and Vehicular system relevant parameter and local environment, so as to protect
The power-assisted effect for demonstrate,proving vacuum booster (13) is constant, and then guarantees vehicle brake efficiency, and guarantee the consistency of brake feel.
The delay time that control relay (3) disconnects is determined by following formula:
In formula, t is height above sea level when being h, and corresponding electric vacuum pump is lengthened working hours；KqTo be pressed when being evacuated and terminate with equipment
Strong related correction factor, takes 1 herein；VzFor the volume of vacuum booster vacuum chamber (7)；VgFor vacuum tank (17) volume；SpFor
The nominal speed of exhaust of electric vacuum pump (5)；DmFor master cylinder internal diameter；PmIt is hydraulic for master cylinder；FpBraking is stepped on for driver
When brake pedal force；ipFor brake pedal lever ratio；D is the effective diameter of Vacuum booster diaphragm (8)；P0For plains region
Atmospheric pressure；PhWhen for height above sea level being h, corresponding atmospheric pressure；△ P is the pressure difference of Vacuum booster diaphragm (8) two sides.
Based on above structure, which can be had the following advantages that.
1) system detects ambient atmosphere pressure using barometric pressure sensor (2), and then monitors the sea in running car area
Degree of lifting, when detecting vehicle driving in highlands, and when vacuum tank (17) interior vacuum degree reaches required upper threshold, electronics
Control unit (1) controls relay (3) delay and disconnects, and makes electric vacuum pump (5) delay working, and according to different ambient atmospheres
Pressure, control electric vacuum pump (5) delay different time are conducive to overcome to provide sufficient vacuum degree for vacuum tank (17)
The problems such as brake efficiency as caused by the vacuum degree deficiency of highlands is poor increases substantially vehicle braking and feels consistency.
2) electric vacuum pump (5) is connected through a screw thread with vacuum tank (17), and check valve (6) are housed therebetween, this has
Effect shortens the gas circuit between electric vacuum pump (5) and vacuum tank (17), high with level of integrated system, space-saving advantage,
And it can effectively improve the respond of electric vacuum pump (5) and the speed of exhaust of electric vacuum pump (5), avoid intake and exhaust stagnant
Phenomenon afterwards, to effectively ensure the sensitivity and safety of braking of battery electric vehicle；Electric vacuum pump (5) and vacuum tank (17)
Between and vacuum tank (17) and check valve (6) between be all made of and be threadedly coupled, structure is simple, easy to process, good seal performance；Electricity
Check valve (6) are set between dynamic vacuum pump (5) and vacuum tank (17), it is ensured that pumping is in the right direction, prevents vacuum from flowing backwards, and effectively increases
Add the leakproofness of vacuum tank (17).
Claims (3)
1. a kind of brake of electric vehicle digital electric vacuum assistance system for taking into account altitude environment is by electronic control unit (1), atmospheric pressure
Force snesor (2), relay (3), battery (4), electric vacuum pump (5), check valve (6), vacuum booster (13), vacuum tank
(17), vacuum sensor (18) forms, it is characterised in that:
Vacuum sensor (18) are fixedly installed on the inner wall of vacuum tank (17)；
Barometric pressure sensor (2) and vacuum sensor (18) pass through any of signal wire and electronic control unit (1) respectively
Two-way AD sample circuit is connected；
Battery (4) is connected by circuit with electric vacuum pump (5), and relay (3) is connected in series in the circuit loop；
The control terminal of relay (3) is connected with any I/O circuit all the way of electronic control unit (1), and electronic control unit (1) is logical
Cross the disconnection and closure of corresponding I/O Interface Controller relay (3)；
It is connect between electric vacuum pump (5) and vacuum tank (17) by check valve (6), check valve (6) passes through check valve valve body
(30) internal screw thread on is connect with the external screw thread on vacuum tank air outlet (22)；Electric vacuum pump air inlet port (23) passes through spiral shell
Line is fixedly connected with the internal screw thread of vacuum tank air outlet (22)；Gas can only flow into electric vacuum pump (5) by vacuum tank (17)；
Vacuum tank air inlet port (16) has external screw thread, is fixedly connected with any end of vacuum connector pipe (15)；Vacuum connects
The other end of adapter tube road (15) is fixedly connected with the vacuum booster power-assisted port (14) of vacuum booster (13).
2. a kind of brake of electric vehicle digital electric vacuum assistance system for taking into account altitude environment as described in claim 1, feature
Be: electronic control unit (1) judges the sea in running car area according to the atmospheric pressure value that barometric pressure sensor (2) exports
Degree of lifting；When running car is at non-highlands, if needed for being reached by the vacuum degree that vacuum sensor (18) measures
When threshold value, the circuit that electronic control unit (1) controls between relay (3) cutting battery (4) and electric vacuum pump (5) connects
It connects, electric vacuum pump (5) stops working；When running car is at highlands, if measured by vacuum sensor (18)
When vacuum degree reaches required threshold value, electronic control unit (1) controls relay (3) delay cutoff battery (4) and electronic true
Circuit connection between sky pump (5).
3. a kind of brake of electric vehicle digital electric vacuum assistance system for taking into account altitude environment as claimed in claim 2, feature
Be: the delay cutoff time of control relay (3) is determined by following formula
In formula, t is height above sea level when being h, controls the delay cutoff time of relay (3)；KqPressure when being terminated to be evacuated with equipment
Related correction factor, takes 1 herein；VzFor the volume of vacuum booster vacuum chamber (7)；VgFor vacuum tank (17) volume；SpFor electricity
The nominal speed of exhaust of dynamic vacuum pump (5)；DmFor master cylinder internal diameter；PmIt is hydraulic for master cylinder；FpWhen stepping on braking for driver
Brake pedal force；ipFor brake pedal lever ratio；D is the effective diameter of Vacuum booster diaphragm (8)；P0For plains region
Atmospheric pressure；PhAtmospheric pressure when for height above sea level being h；△ P is the pressure difference of Vacuum booster diaphragm (8) two sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910778032.7A CN110435618A (en) | 2019-08-22 | 2019-08-22 | A kind of brake of electric vehicle digital electric vacuum assistance system for taking into account altitude environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910778032.7A CN110435618A (en) | 2019-08-22 | 2019-08-22 | A kind of brake of electric vehicle digital electric vacuum assistance system for taking into account altitude environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110435618A true CN110435618A (en) | 2019-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910778032.7A Pending CN110435618A (en) | 2019-08-22 | 2019-08-22 | A kind of brake of electric vehicle digital electric vacuum assistance system for taking into account altitude environment |
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| Country | Link |
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| CN (1) | CN110435618A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458155A (en) * | 2020-04-09 | 2020-07-28 | 东风汽车集团有限公司 | Different-altitude atmospheric pressure environment simulation system and method for brake performance test |
| CN113734127A (en) * | 2021-09-27 | 2021-12-03 | 广西宁达汽车科技有限公司 | Plateau control method for vacuum system of new energy electric vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105398436A (en) * | 2015-12-30 | 2016-03-16 | 北京新能源汽车股份有限公司 | Assist brake system of vehicle and vehicle provided with same |
| CN106939884A (en) * | 2017-04-28 | 2017-07-11 | 吉林大学 | A kind of electric vacuum pump of automobile test system |
| CN207497278U (en) * | 2017-11-29 | 2018-06-15 | 汤湘军 | vacuum sample tank |
| CN109849884A (en) * | 2019-02-22 | 2019-06-07 | 威马智慧出行科技（上海）有限公司 | Automotive electronics vacuum method for controlling pump and electronic equipment |
| EP3533675A1 (en) * | 2016-12-28 | 2019-09-04 | Daimler AG | Electric vacuum pump control apparatus and electric vacuum pump control method |
-
2019
- 2019-08-22 CN CN201910778032.7A patent/CN110435618A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105398436A (en) * | 2015-12-30 | 2016-03-16 | 北京新能源汽车股份有限公司 | Assist brake system of vehicle and vehicle provided with same |
| EP3533675A1 (en) * | 2016-12-28 | 2019-09-04 | Daimler AG | Electric vacuum pump control apparatus and electric vacuum pump control method |
| CN106939884A (en) * | 2017-04-28 | 2017-07-11 | 吉林大学 | A kind of electric vacuum pump of automobile test system |
| CN207497278U (en) * | 2017-11-29 | 2018-06-15 | 汤湘军 | vacuum sample tank |
| CN109849884A (en) * | 2019-02-22 | 2019-06-07 | 威马智慧出行科技（上海）有限公司 | Automotive electronics vacuum method for controlling pump and electronic equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111458155A (en) * | 2020-04-09 | 2020-07-28 | 东风汽车集团有限公司 | Different-altitude atmospheric pressure environment simulation system and method for brake performance test |
| CN113734127A (en) * | 2021-09-27 | 2021-12-03 | 广西宁达汽车科技有限公司 | Plateau control method for vacuum system of new energy electric vehicle |
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Application publication date: 20191112 |