CN109229087A - A kind of braking anti-lock vehicle wheel cylinder hydraulic force control system and method - Google Patents
A kind of braking anti-lock vehicle wheel cylinder hydraulic force control system and method Download PDFInfo
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- CN109229087A CN109229087A CN201811133032.3A CN201811133032A CN109229087A CN 109229087 A CN109229087 A CN 109229087A CN 201811133032 A CN201811133032 A CN 201811133032A CN 109229087 A CN109229087 A CN 109229087A
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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
- B60T13/74—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 electrical assistance or drive
- B60T13/745—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 electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
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Abstract
The present invention relates to a kind of braking anti-lock vehicle wheel cylinder hydraulic force control system and methods, the system includes electronic control unit and the brake pedal and reduction gearing mechanism that are attached thereto respectively, the system further includes hydraulic braking source, front wheel cylinder, rear service brake wheel cylinder, main hydraulic brake unit, auxiliary hydraulic brake unit and signal detecting unit, the front wheel cylinder and rear service brake wheel cylinder is respectively set two and corresponds to four wheels of vehicle, the hydraulic braking source is connected to front wheel cylinder and rear service brake wheel cylinder by main hydraulic brake unit, the hydraulic braking source also passes through auxiliary hydraulic brake unit and is connected to rear service brake wheel cylinder, the signal detecting unit is separately connected front wheel cylinder, rear service brake wheel cylinder and electronic control unit.Compared with prior art, the present invention can effectively realize vehicle braking anti-lock function, securely and reliably, can obtain good control effect.
Description
Technical field
The present invention relates to a kind of motor vehicle braking system and methods, more particularly, to a kind of braking anti-lock vehicle wheel cylinder hydraulic pressure
Force control system and method.
Background technique
Due to becoming increasingly conspicuous for energy shortage and environmental problem, electric car is with its cleanliness without any pollution, energy efficiency height etc.
Advantage becomes the Main way of auto industry future development.With the raising and traffic accident of intelligent requirements, traffic congestion
The problems such as need to solve, more Automobile Enterprises such as continent, general carry out the research of automatic driving vehicle, the development of automatic Pilot technology
Rapidly.Braking system, which carries out braking not against manpower in Vehicular automatic driving, becomes problem to be solved.
Electronic hydraulic brake system (EHB) is a kind of more novel braking system, is one kind of line control brake system, it
With electronic component instead of some mechanical element, no longer it is connected directly between brake pedal and wheel cylinder, is adopted using sensor
Collect driver's operation information and be intended to as control, brake operating is completed by hydraulic actuator completely.New-energy automobile is being made
During dynamic, while hydraulic braking force is applied to wheel, make driving motor work in regenerative electric power braking state also to wheel
Apply regenerative braking force, is set to recycle the energy generated when braking while completing vehicle effective brake and be stored in energy storage
For utilizing again in standby.
Electronic hydraulic brake system has some advantages compared with traditional liquid braking device: (1) it is compact-sized, improve system
Dynamic performance；(2) easy to control reliable, brake oil is substantially reduced；(3) vacuum plant is not needed, brake pedal is effectively reduced
Feeling etc..Due to these advantages of electronic hydraulic brake system, early in 1993, Ford Motor Company was just in a electronic vapour
EHB system is mounted on vehicle, later General Corporation also uses EHB on its Cars.Currently, what Benz Co. newly released
SL500 equally uses EHB, is that first volume production vehicle using brake-by-wire technology, its EHB technology are public by Bosch in the world
A part that department provides and electrically controlled brake system SBC (Sensotronic Brake Control).
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of braking anti-lock vehicles
Wheel cylinder hydraulic pressure Force control system and method.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of braking anti-lock vehicle wheel cylinder hydraulic force control system, the system include electronic control unit and respectively with
Connection brake pedal and reduction gearing mechanism, which further includes hydraulic braking source, front wheel cylinder, rear service brake wheel
Cylinder, main hydraulic brake unit, auxiliary hydraulic brake unit and signal detecting unit, the front wheel cylinder and rear service brake wheel
Cylinder is respectively set two and corresponds to four wheels of vehicle, before the hydraulic braking source is connected to by main hydraulic brake unit
Wheel wheel cylinder and rear service brake wheel cylinder, the hydraulic braking source also pass through auxiliary hydraulic brake unit and are connected to rear service brake wheel
Cylinder, the signal detecting unit are separately connected front wheel cylinder, rear service brake wheel cylinder and electronic control unit.
Hydraulic braking source includes fluid reservoir and master cylinder, and the fluid reservoir connects master cylinder, the braking master
Cylinder connects main hydraulic brake unit and auxiliary hydraulic brake unit.
The main hydraulic brake unit includes four main hydraulic branch, and it is hydraulic that the master cylinder passes through a master respectively
Branch is connected to two front wheel cylinders and two rear service brake wheel cylinders, is arranged in series one respectively in every main hydraulic branch
Normally open solenoid valve.
The auxiliary hydraulic brake unit includes low pressure accumulator and two auxiliary hydraulic branch, two rear service brake wheel cylinders point
Not Tong Guo an auxiliary hydraulic branch connect low pressure accumulator, be arranged in series a normally closed electromagnetism respectively in every auxiliary hydraulic branch
Also pass through check valve at valve, the auxiliary hydraulic branch and low pressure accumulator tie point and hydraulic pump connect master cylinder.
The signal detecting unit includes master cylinder hydraulic pressure force snesor and wheel cylinder hydraulic pressure force snesor, the master cylinder liquid
Pressure sensor is set to master cylinder delivery outlet, and the front wheel cylinder and rear service brake wheel cylinder respectively correspond setting one
It is single that a wheel cylinder hydraulic pressure force snesor, the master cylinder hydraulic pressure force snesor and wheel cylinder hydraulic pressure force snesor are connected to electronic control
Member.
The reduction gearing mechanism includes control motor and worm type of reduction gearing, and the control motor connects worm gear
Worm reducer, worm type of reduction gearing export axis connection master cylinder.
A kind of braking anti-lock vehicle wheel cylinder hydraulic coupling control method, this method are based on above-mentioned braking anti-lock vehicle wheel cylinder
Hydraulic force control system, this method comprises the following steps:
(1) electronic control unit obtains operator brake according to brake pedal action situation and is intended to and according to on-vehicle information meter
Calculate demand braking force；
(2) reduction gearing mechanism acts and starts hydraulic braking source；
(3) electronic control unit determines whether the corresponding wheel cylinder of each wheel needs to depressurize by calculating wheel slip, if
Rear-wheel wheel cylinder need depressurize thens follow the steps (3-1-1)~(3-1-3), if front-wheel wheel cylinder need depressurize if execute (3-2-1)~
(3-2-3), it is no to then follow the steps (5)；
(3-1-1) disconnects the normally open solenoid valve of main hydraulic branch corresponding to the rear-wheel wheel cylinder for needing to depressurize, rear-wheel wheel cylinder
Pressure maintaining；
The normally closed solenoid valve that (3-1-2) opens auxiliary hydraulic branch corresponding to the rear-wheel wheel cylinder for needing to depressurize carries out rear-wheel
Decompression is until rear-wheel pressure of wheel braking cylinder reaches requirements, closing normally closed solenoid valve, rear-wheel wheel cylinder pressure maintaining；
(3-1-3) rear wheel slip rate is down to critical value hereinafter, opening the normally opened of main hydraulic branch corresponding to rear-wheel wheel cylinder
Solenoid valve connects master cylinder hydraulic coupling and is pressurized to operator demand's value, and opening hydraulic pump will storage braking in low pressure accumulator
Liquid is quickly expelled to predetermined value；
(3-2-1) disconnects the normally open solenoid valve of main hydraulic branch corresponding to rear-wheel wheel cylinder, rear-wheel wheel cylinder pressure maintaining；
Hydraulic coupling needed for (3-2-2) master cylinder is decompressed to front-wheel wheel cylinder, front-wheel wheel cylinder complete decompression, disconnect front-wheel wheel cylinder
The normally open solenoid valve of corresponding main hydraulic branch, front-wheel wheel cylinder pressure maintaining；
After (3-2-3) front wheel slip rate is down to critical value or less, opens each wheel cylinder and correspond to normally open solenoid valve, master cylinder liquid
Pressure boost is to operator demand's value；
(4) judge whether braking anti-lock process terminates, if so then execute step (5), otherwise repeat step (3)；
(5) front wheel cylinder and rear service brake wheel cylinder hydraulic pressure power are consistent with master cylinder hydraulic coupling, follow driving
Member's changes in demand；
(6) braking process terminates, master cylinder and low pressure accumulator pressure release.
Step (3-1-2) depressurizes rear-wheel specifically: opens auxiliary liquid pressure corresponding to the rear-wheel wheel cylinder for needing to depressurize
The normally closed solenoid valve of branch, judges whether rear-wheel decompression rate reaches setting value, if then rear-wheel wheel cylinder passes through low pressure accumulator
It is depressurized, otherwise, opens hydraulic pump and assist quick pressure releasing.
Compared with prior art, the present invention has the advantage that
(1) main hydraulic brake unit and auxiliary liquid compacting is arranged in braking anti-lock vehicle wheel cylinder hydraulic force control system of the present invention
Moving cell is not only able to realize conventional brake function, can also realize braking anti-lock (ABS) function；
(2) the auxiliary hydraulic brake unit setting low pressure accumulator of the present invention and hydraulic pump can accelerate rear-wheel wheel cylinder fast decompression,
The dangerous working condition of rear lock is avoided the occurrence of, is braked more safe and reliable；
(3) present invention auxiliary hydraulic brake unit setting low pressure accumulator, which can efficiently use, stores after the braking of rear-wheel wheel cylinder
Partial brake liquid realizes the additional mechanical supercharging of master cylinder, so that master cylinder hydraulic coupling Quick-pressurizing is protected to operator demand's value
Demonstrate,prove operational reliability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of braking anti-lock vehicle wheel cylinder hydraulic force control system of the present invention；
Fig. 2 is the flow diagram of braking anti-lock vehicle wheel cylinder hydraulic coupling control method of the present invention.
In figure, 1 is electronic control unit, and 2 be battery, and 3 be DC/AC converter, and 4 be control motor, and 5 be worm and gear
Retarder, 6 be fluid reservoir, and 7 be brake pedal, and 8 be pedal displacement sensor, and 9 be pedal simulation and decoupling unit, and 10 be braking
Master cylinder, 11,12 be master cylinder hydraulic coupling sensor, 13,14,15,16 be normally open solenoid valve, 17,18 be normally closed solenoid valve, 19,20,
21,22 be wheel cylinder hydraulic pressure force snesor, and 23,24 be front wheel cylinder, and 25,26 be rear service brake wheel cylinder, and 27 be low pressure accumulation of energy
Device, 28 be check valve, and 29 be hydraulic pump.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.Note that the following embodiments and the accompanying drawings is said
Bright is substantial illustration, and the present invention is not intended to be applicable in it object or its purposes is defined, and the present invention does not limit
In the following embodiments and the accompanying drawings.
Embodiment
As shown in Figure 1, a kind of braking anti-lock vehicle wheel cylinder hydraulic force control system, which includes electronic control unit
1 (ECU) and the brake pedal 7 and reduction gearing mechanism being attached thereto respectively, the system further include hydraulic braking source, front-wheel system
Driving wheel cylinder 23,24, rear service brake wheel cylinder 25,26, main hydraulic brake unit, auxiliary hydraulic brake unit and signal detecting unit, it is preceding
Wheel wheel cylinder 23,24 and rear service brake wheel cylinder 25,26 are respectively set two and correspond to four wheels of vehicle, hydraulic braking source
It is connected to front wheel cylinder 23,24 and rear service brake wheel cylinder 25,26 by main hydraulic brake unit, hydraulic braking source also passes through
Auxiliary hydraulic brake unit is connected to rear service brake wheel cylinder 25,26, signal detecting unit be separately connected front wheel cylinder 23,24,
Rear service brake wheel cylinder 25,26 and electronic control unit 1.
Brake pedal 7 connects electronic control unit 1 by pedal displacement sensor 8 in the present embodiment, and then passes through pedal
Displacement sensor 8 perceives the braking intention of driver, and in addition brake pedal 7 also passes through pedal simulation and decoupling unit 9 connects
It acts to reduction gearing mechanism, and then by brake pedal 7 to control the movement of deceleration sensor mechanism.
Reduction gearing mechanism includes control motor 4 and worm type of reduction gearing 5, and control 4 input terminal of motor is become by DC/AC
Parallel operation 3 connects battery, while DC/AC converter 3 connects electronic control unit 1, and control 4 output end of motor connects worm and gear
Retarder 5, worm type of reduction gearing 5 export axis connection master cylinder 10.
Hydraulic braking source includes fluid reservoir 6 and master cylinder 10, and fluid reservoir 6 connects master cylinder 10, and master cylinder 10 connects
Connect main hydraulic brake unit and auxiliary hydraulic brake unit.
Signal detecting unit includes master cylinder hydraulic pressure force snesor 11,12 and wheel cylinder hydraulic pressure force snesor 19,20,21,22, master
The hydraulic force snesor 11,12 of cylinder is set to 10 delivery outlet of master cylinder, front wheel cylinder 23,24 and rear service brake wheel cylinder 25,
26 respectively correspond one wheel cylinder hydraulic pressure force snesor 19,20,21,22 of setting, master cylinder hydraulic pressure force snesor 11,12 and wheel cylinder hydraulic pressure
Force snesor 19,20,21,22 is connected to electronic control unit 1.
Main hydraulic brake unit includes four main hydraulic branch, and the master cylinder 10 passes through a main hydraulic branch respectively
Two front wheel cylinders 23,24 and two rear service brake wheel cylinders 25,26 are connected to, connects and sets respectively in every main hydraulic branch
Set normally open solenoid valve 13,14,15,16.
Auxiliary hydraulic brake unit includes low pressure accumulator and two auxiliary hydraulic branch, and two 25,26 points of rear service brake wheel cylinder
Not Tong Guo an auxiliary hydraulic branch connect low pressure accumulator, be arranged in series a normally closed solenoid valve respectively in every auxiliary hydraulic branch
17,18, also pass through check valve 28 at auxiliary hydraulic branch and low pressure accumulator tie point and hydraulic pump 29 connect master cylinder 10.It is low
The combination of pressure accumulator and hydraulic pump 29 can help rear-wheel wheel cylinder fast decompression, avoid the occurrence of the dangerous working condition of rear lock.
When having storage brake fluid in low pressure accumulator, hydraulic pump 29 is pressurized but also as back-up power source auxiliary braking master cylinder 10.To protect
Card hydraulic pump 29 can be used as stand-by power source, therefore will store part brake fluid in low pressure accumulator after braking for the first time as hydraulic pump
29 brake fluid source.The brake fluid total amount of storage requires to determine according to decompression rate.After braking, hydraulic pump 29 is opened
Brake fluid in fast evacuation low pressure accumulator.
When front-wheel wheel cylinder needs to be pressurized, the rotating forward that electronic control unit 1 controls motor 4 pushes master cylinder push rod to realize system
Pressurization corresponds to normally open solenoid valve 13,14,15,16 and powers off, thus improves front wheel brake power；When front-wheel wheel cylinder needs to depressurize,
Electronic control unit 1, which controls the reversion of motor 4, reduces master cylinder system hydraulic coupling, and corresponding normally open solenoid valve 13,14,15,16 powers off, drop
Low wheel cylinder hydraulic pressure power；When front-wheel wheel cylinder needs pressure maintaining, corresponding normally open solenoid valve 13,14,15,16 is powered, and closes front wheel brake
Circuit makes front-wheel wheel cylinder pressure maintaining.When rear-wheel wheel cylinder needs to be pressurized, the rotating forward that electronic control unit 1 controls motor 4 pushes master cylinder
Push rod realizes system boost, thus corresponding solenoid valve power-off improves front wheel brake power, if there is storage to brake in low pressure accumulator
Liquid, hydraulic pump 29 also can be used as the pressurization of back-up power source auxiliary braking master cylinder 10；When rear-wheel wheel cylinder needs to depressurize, need to depressurize
Correspondence wheel cylinder solenoid valves, open low tension loop, rear-wheel can be helped by the combination of low pressure accumulator and hydraulic pump 29
Wheel cylinder fast decompression avoids the occurrence of the dangerous working condition of rear lock；When rear-wheel wheel cylinder needs pressure maintaining, corresponding normally open solenoid valve
13,14,15,16 energizations, normally closed solenoid valve 17,18 power off, and closing rear service brake circuit makes rear-wheel wheel cylinder pressure maintaining.Each wheel cylinder of automobile
Can independent control, the voltage-controlled system of wheel wheel cylinder increase and decrease is flexible.
As shown in Fig. 2, a kind of braking anti-lock vehicle wheel cylinder hydraulic coupling control method, this method is based on above-mentioned anti-braking
Dead vehicle wheel cylinder hydraulic force control system, this method comprises the following steps:
(1) electronic control unit 1 obtains operator brake according to 7 action situation of brake pedal and is intended to and according to on-vehicle information
Calculate demand braking force；
(2) reduction gearing mechanism acts and starts hydraulic braking source；
(3) electronic control unit 1 determines whether the corresponding wheel cylinder of each wheel needs to depressurize by calculating wheel slip, if
Rear-wheel wheel cylinder need depressurize thens follow the steps (3-1-1)~(3-1-3), if front-wheel wheel cylinder need depressurize if execute (3-2-1)~
(3-2-3), it is no to then follow the steps (5)；
Such as vehicle travels driver's brake pedal 7 on road, according to demand, front-wheel wheel cylinder hydraulic pressure power is
40bar, rear-wheel wheel cylinder hydraulic coupling are 30bar, 10 hydraulic coupling of master cylinder to 40bar.Since road adherence is smaller, rear-wheel has
Locking tendency needs to be decompressed to 25bar, and front-wheel has locking tendency to need to be decompressed to 35bar.
In the present embodiment, rear-wheel wheel cylinder is depressurized first, executes step (3-1-1)~(3-1-3):
(3-1-1) disconnect the normally open solenoid valve 13 for needing main hydraulic branch corresponding to the rear-wheel wheel cylinder that depressurizes, 14,15,
16, rear-wheel wheel cylinder pressure maintaining；
In the present embodiment, wheel cylinder hydraulic pressure force snesor 21,22 is detecting that corresponding rear-wheel wheel cylinder reaches demand braking force
Closing normally open solenoid valve 15,16 afterwards makes rear-wheel wheel cylinder pressure maintaining；
After (3-1-2) opens 17,18 pairs of normally closed solenoid valve of auxiliary hydraulic branch corresponding to the rear-wheel wheel cylinder for needing to depressurize
Wheel carries out decompression until rear-wheel pressure of wheel braking cylinder reaches requirements, closing normally closed solenoid valve 17,18, rear-wheel wheel cylinder pressure maintaining, wherein right
Rear-wheel is depressurized specifically: the normally closed solenoid valve 17,18 of auxiliary hydraulic branch corresponding to the rear-wheel wheel cylinder for needing to depressurize is opened,
Judge whether rear-wheel decompression rate reaches setting value, if then rear-wheel wheel cylinder is depressurized by low pressure accumulator, otherwise, opens
Hydraulic pump 29 assists quick pressure releasing；
In the present embodiment, normally closed solenoid valve 17,18 powers on opening, rear-wheel wheel cylinder 25,26 hydraulic coupling rapid decreases, if low pressure
Accumulator hydraulic energy is excessively high to cause pressure to decline slowly, opens hydraulic pump 29, assists fast decompression, when its wheel cylinder hydraulic pressure power senses
When device 21,22 detects that rear-wheel wheel cylinder hydraulic coupling is 25bar, it is electrically turn off on normally open solenoid valve 15,16, normally closed solenoid valve 17,18
Power-off is closed, and the power-off of hydraulic pump 29 is closed, rear-wheel wheel cylinder pressure maintaining；
(3-1-3) rear wheel slip rate is down to critical value hereinafter, opening the normally opened of main hydraulic branch corresponding to rear-wheel wheel cylinder
Solenoid valve 13,14,15,16 connects 10 hydraulic coupling of master cylinder and is pressurized to operator demand's value, and opens hydraulic pump 29 and store low pressure
Storage brake fluid is quickly expelled to predetermined value in energy device；
In the present embodiment, it is calculated after rear wheel slip rate is down to critical value or less, opens hydraulic pump 29 for low pressure accumulation of energy
Stored in device extra brake fluid be quickly discharged simultaneously 10 hydraulic coupling of auxiliary braking master cylinder restore to 25bar, normally open solenoid valve 15,16
Lower electricity is opened immediately, and rear-wheel wheel cylinder hydraulic coupling reverts to 25bar.
Then, front-wheel wheel cylinder is depressurized, executes step (3-2-1)~(3-2-3):
(3-2-1) disconnects the normally open solenoid valve 13,14,15,16 of main hydraulic branch corresponding to rear-wheel wheel cylinder, rear-wheel wheel cylinder
Pressure maintaining；
In the present embodiment, wheel cylinder hydraulic pressure force snesor 19,20 is detecting that corresponding front-wheel wheel cylinder reaches demand braking force
Closing normally open solenoid valve 13,14,15,1613,14 afterwards makes front-wheel wheel cylinder pressure maintaining；
Hydraulic coupling needed for (3-2-2) master cylinder 10 is decompressed to front-wheel wheel cylinder, front-wheel wheel cylinder complete decompression, disconnect front-wheel wheel
The normally open solenoid valve 13,14,15,16 of main hydraulic branch corresponding to cylinder, front-wheel wheel cylinder pressure maintaining；
The hydraulic coupling under the control of control motor 4 of master cylinder 10 reduces to 35bar, and front-wheel wheel cylinder 23,24 brake fluid are hydraulic
Power follows master cylinder 10 to change, when wheel cylinder hydraulic pressure force snesor 19,20 detects that front-wheel wheel cylinder hydraulic pressure power is 35bar, often
It is electrically turn off on open electromagnetic valve 13,14,15,1613,14, front-wheel wheel cylinder pressure maintaining；
After (3-2-3) front wheel slip rate is down to critical value or less, open each wheel cylinder correspond to normally open solenoid valve 13,14,15,
16,10 hydraulic coupling of master cylinder is pressurized to operator demand's value；
In the present embodiment, be calculated after front wheel slip rate is down to critical value or less, 10 hydraulic coupling of master cylinder restore to
35bar, normally open solenoid valve 13,14,15,1613,14 immediately open by lower electricity, and rear-wheel wheel cylinder hydraulic coupling reverts to 35bar；
(4) judge whether braking anti-lock process terminates, if so then execute step (5), otherwise repeat step (3)；
(5) front wheel cylinder 23,24 and rear service brake wheel cylinder 25,26 hydraulic couplings and 10 hydraulic coupling of master cylinder keep one
It causes, operator demand is followed to change；
(6) braking process terminates, master cylinder 10 and low pressure accumulator pressure release.
Above embodiment is only to enumerate, and does not indicate limiting the scope of the invention.These embodiments can also be with other
Various modes are implemented, and can make in the range of not departing from technical thought of the invention it is various omit, displacement, change.
Claims (8)
1. a kind of braking anti-lock vehicle wheel cylinder hydraulic force control system, which includes electronic control unit and distinguishes therewith
The brake pedal and reduction gearing mechanism of connection, which is characterized in that the system further include hydraulic braking source, front wheel cylinder,
Rear service brake wheel cylinder, main hydraulic brake unit, auxiliary hydraulic brake unit and signal detecting unit, the front wheel cylinder and
Rear service brake wheel cylinder is respectively set two and corresponds to four wheels of vehicle, and the hydraulic braking source passes through main hydraulic braking list
Member is connected to front wheel cylinder and rear service brake wheel cylinder, and the hydraulic braking source also passes through auxiliary hydraulic brake unit and is connected to
Rear service brake wheel cylinder, it is single that the signal detecting unit is separately connected front wheel cylinder, rear service brake wheel cylinder and electronic control
Member.
2. a kind of braking anti-lock vehicle wheel cylinder hydraulic force control system according to claim 1, which is characterized in that hydraulic
Braking source includes fluid reservoir and master cylinder, and the fluid reservoir connects master cylinder, and the master cylinder connection master is hydraulic
Brake unit and auxiliary hydraulic brake unit.
3. a kind of braking anti-lock vehicle wheel cylinder hydraulic force control system according to claim 2, which is characterized in that described
Main hydraulic brake unit include four main hydraulic branch, the master cylinder passes through a main hydraulic branch respectively and is connected to two
Front wheel cylinder and two rear service brake wheel cylinders are arranged in series a normally open solenoid valve in every main hydraulic branch respectively.
4. a kind of braking anti-lock vehicle wheel cylinder hydraulic force control system according to claim 3, which is characterized in that described
Auxiliary hydraulic brake unit include low pressure accumulator and two auxiliary hydraulic branch, two rear service brake wheel cylinders pass through respectively one it is auxiliary
Hydraulic branch connects low pressure accumulator, is arranged in series a normally closed solenoid valve, the auxiliary liquid respectively in every auxiliary hydraulic branch
Also pass through check valve at pressure branch and low pressure accumulator tie point and hydraulic pump connect master cylinder.
5. a kind of braking anti-lock vehicle wheel cylinder hydraulic force control system according to claim 2, which is characterized in that described
Signal detecting unit include master cylinder hydraulic pressure force snesor and wheel cylinder hydraulic pressure force snesor, the master cylinder hydraulic pressure force snesor is set
It is placed in master cylinder delivery outlet, the front wheel cylinder and rear service brake wheel cylinder respectively correspond one wheel cylinder hydraulic pressure power of setting
Sensor, the master cylinder hydraulic pressure force snesor and wheel cylinder hydraulic pressure force snesor are connected to electronic control unit.
6. a kind of braking anti-lock vehicle wheel cylinder hydraulic force control system according to claim 2, which is characterized in that described
Reduction gearing mechanism include control motor and worm type of reduction gearing, the control motor connects worm type of reduction gearing,
Worm type of reduction gearing exports axis connection master cylinder.
7. a kind of braking anti-lock vehicle wheel cylinder hydraulic coupling control method, which is characterized in that this method is based on described in claim 4
Braking anti-lock vehicle wheel cylinder hydraulic force control system, this method comprises the following steps:
(1) electronic control unit obtains operator brake according to brake pedal action situation and is intended to and is calculated according to on-vehicle information make
Power demand；
(2) reduction gearing mechanism acts and starts hydraulic braking source；
(3) electronic control unit determines whether the corresponding wheel cylinder of each wheel needs to depressurize by calculating wheel slip, if rear-wheel
Wheel cylinder, which needs to depressurize, thens follow the steps (3-1-1)~(3-1-3), executes (3-2-1)~(3-2- if front-wheel wheel cylinder needs to depressurize
3), no to then follow the steps (5)；
(3-1-1) disconnects the normally open solenoid valve of main hydraulic branch corresponding to the rear-wheel wheel cylinder for needing to depressurize, rear-wheel wheel cylinder pressure maintaining；
(3-1-2), which is opened, needs the normally closed solenoid valve of auxiliary hydraulic branch corresponding to the rear-wheel wheel cylinder depressurized to depressurize rear-wheel
Until rear-wheel pressure of wheel braking cylinder reaches requirements, normally closed solenoid valve, rear-wheel wheel cylinder pressure maintaining are closed；
(3-1-3) rear wheel slip rate is down to critical value hereinafter, opening the normally opened electromagnetism of main hydraulic branch corresponding to rear-wheel wheel cylinder
Valve connects master cylinder hydraulic coupling and is pressurized to operator demand's value, and open hydraulic pump will in low pressure accumulator store brake fluid it is fast
Speed is expelled to predetermined value；
(3-2-1) disconnects the normally open solenoid valve of main hydraulic branch corresponding to rear-wheel wheel cylinder, rear-wheel wheel cylinder pressure maintaining；
Hydraulic coupling needed for (3-2-2) master cylinder is decompressed to front-wheel wheel cylinder, front-wheel wheel cylinder complete decompression, and it is right to disconnect front-wheel wheel cylinder institute
The normally open solenoid valve for the main hydraulic branch answered, front-wheel wheel cylinder pressure maintaining；
After (3-2-3) front wheel slip rate is down to critical value or less, opens each wheel cylinder and correspond to normally open solenoid valve, master cylinder hydraulic coupling
It is pressurized to operator demand's value；
(4) judge whether braking anti-lock process terminates, if so then execute step (5), otherwise repeat step (3)；
(5) front wheel cylinder and rear service brake wheel cylinder hydraulic pressure power are consistent with master cylinder hydraulic coupling, and driver is followed to need
Ask variation；
(6) braking process terminates, master cylinder and low pressure accumulator pressure release.
8. a kind of braking anti-lock vehicle wheel cylinder hydraulic coupling control method according to claim 7, which is characterized in that step
(3-1-2) depressurizes rear-wheel specifically: opens the normally closed electricity of auxiliary hydraulic branch corresponding to the rear-wheel wheel cylinder for needing to depressurize
Magnet valve, judges whether rear-wheel decompression rate reaches setting value, no if then rear-wheel wheel cylinder is depressurized by low pressure accumulator
Then, it opens hydraulic pump and assists quick pressure releasing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811133032.3A CN109229087A (en) | 2018-09-27 | 2018-09-27 | A kind of braking anti-lock vehicle wheel cylinder hydraulic force control system and method |
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| CN201811133032.3A CN109229087A (en) | 2018-09-27 | 2018-09-27 | A kind of braking anti-lock vehicle wheel cylinder hydraulic force control system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111348025A (en) * | 2019-04-26 | 2020-06-30 | 京西重工（上海）有限公司 | Electro-hydraulic brake system and method for preventing wheel slip of vehicle using the same |
| CN114056303A (en) * | 2021-11-17 | 2022-02-18 | 苏州卡泰汽车科技有限公司 | Anti-lock braking system |
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|---|---|---|---|---|
| CN1155261A (en) * | 1994-07-20 | 1997-07-23 | Itt欧洲自动车股份公司 | Process for operating anti-lock moter vehicle braking system |
| CN204567653U (en) * | 2015-03-27 | 2015-08-19 | 同济大学 | A kind of EHB |
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| CN111348025A (en) * | 2019-04-26 | 2020-06-30 | 京西重工（上海）有限公司 | Electro-hydraulic brake system and method for preventing wheel slip of vehicle using the same |
| CN111348025B (en) * | 2019-04-26 | 2021-11-19 | 京西重工（上海）有限公司 | Electro-hydraulic brake system and method for preventing wheel slip of vehicle using the same |
| US11760330B2 (en) | 2019-04-26 | 2023-09-19 | Bwi (Shanghai) Co., Ltd. | Electro-hydraulic brake system including isolation valves |
| CN114056303A (en) * | 2021-11-17 | 2022-02-18 | 苏州卡泰汽车科技有限公司 | Anti-lock braking system |
| CN114056303B (en) * | 2021-11-17 | 2024-02-06 | 苏州卡泰汽车科技有限公司 | Anti-lock braking system |
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