CN104442762B - A kind of line control brake system compress control method based on wheel cylinder pressure-reducing valve - Google Patents
A kind of line control brake system compress control method based on wheel cylinder pressure-reducing valve Download PDFInfo
- Publication number
- CN104442762B CN104442762B CN201410528121.3A CN201410528121A CN104442762B CN 104442762 B CN104442762 B CN 104442762B CN 201410528121 A CN201410528121 A CN 201410528121A CN 104442762 B CN104442762 B CN 104442762B
- Authority
- CN
- China
- Prior art keywords
- pressure
- control
- wheel cylinder
- wheel
- reducing valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
-
- 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
- B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
- B60T2201/16—Curve braking control, e.g. turn control within ABS control algorithm
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses a kind of line control brake system compress control method based on wheel cylinder pressure-reducing valve, it is characterised in that the current working condition treatment of system includes conventional brake state, EBD on-positions or abs braking state.Stress control of the present invention by system pressure when too high, is divided into three kinds of situations：Conventional brake, EBD brakings, abs braking.In conventional brake and EBD brakings, small step-length pressure is carried out by wheel cylinder pressure-reducing valve and is adjusted, obtain control stability and dynamic effect good enough；In abs braking, by improving control thresholding, preferable control effect is obtained.
Description
Technical field
The invention belongs to automotive field, and in particular to a kind of line control brake system Stress control side based on wheel cylinder pressure-reducing valve
Method.
Background technology
In Automotive Electronics Parking Brake System of the prior art, by the control valve in such as Fig. 1 carry out system pressure it is too high when
Stress control, due to the influence of equivalent throttle orifice in figure, cause to control in dynamic process master cylinder left and right sides to there is pressure differential.
Pedal is simulated as a result of associated mode so that the pressure differential forms the positive feedback of control system, is easily caused system unstable
Or bad dynamic performance.
The content of the invention
The purpose of the present invention is to propose to a kind of line control brake system compress control method based on wheel cylinder pressure-reducing valve, solve dynamic
Control master cylinder left and right sides to there are problems that caused by pressure differential that system is unstable or poor performance during state, obtain more comfortable pedal
Feel and system pressure dynamic characteristic.
The technical solution adopted by the present invention is：A kind of line control brake system compress control method based on wheel cylinder pressure-reducing valve,
Comprise the following steps：
S1, judges that the current working condition of system is conventional brake state, EBD on-positions or abs braking state；
S2, in the case where the current working condition of system is conventional brake state, all four wheel cylinder Stress control system
Pressure charging valve in system is in connected state, therefore, the system pressure of master cylinder output is consistent with the wheel cylinder pressure at wheel cylinder；
Under the operating mode, when system pressure is too high, pressure regulation is carried out by the pressure-reducing valve of trailing wheel, because pressure-reducing valve is switch valve, therefore
Carry out small step-length Decompression Controlling；
S3, in the case where the current working condition of system is EBD on-positions, only front-wheel wheel cylinder control pressurer system
In pressure charging valve be in connected state, therefore, master cylinder output system pressure can be kept with the wheel cylinder pressure at front-wheel wheel cylinder
Unanimously；Under the operating mode, when system pressure is too high, pressure regulation is carried out by the pressure-reducing valve of front-wheel, equally carry out small step-length decompression
Control；
S4, in the case where the current working condition of system is abs braking state, it is impossible to ensure the system pressure of master cylinder output
Power can be consistent with the wheel cylinder pressure at each wheel wheel cylinder, it is impossible to directly carry out Stress control using wheel cylinder pressure charging valve；At this
In the case of kind, Stress control is carried out by the second control valve.
Wheel cylinder pressure-reducing valve is originally intended to the pressure of wheel braking cylinder control in abs braking anti-lock control process, and former scheme is not used in master
Cylinder Stress control；In the method, in order to the master cylinder pressure at both sides difference of appearance when solving to carry out Stress control by valve is produced not
Stable problem, master cylinder pressure control is carried out using wheel cylinder pressure-reducing valve.
Further, the small step size controlling in the step S2 is specially：Pressurize step-length is 10-20 controlling cycles, decompression
Step-length is according to pressure divergence control, and formula is as follows：
In formula, ePIt is pressure divergence, P is system pressure, and k, λ are the coefficient related to valve port, is obtained by surveying；Work as pressure
When power reaches requirement, small step-length Decompression Controlling is exited.
Further, it is described to pass through the second control valve and carry out Stress control to be specially in the step S4：
When carrying out Stress control by the second control valve, the pedal force transient fluctuation for causing is approximately：
Fflu≈0.28P·S
In formula, S is main cylinder area；
And pressure, when there is deviation, the pedal force deviation for causing is approximately：
Fe≈0.1eP·S
Take FfluThe empirical value of=1.5Fe, as control thresholding empirical value,
eP＞ 1.87P
When, it is controlled；Also, carry out small step-length Decompression Controlling.
Advantages of the present invention：
The present invention solves control in dynamic process caused by master cylinder left and right sides has pressure differential system not to a certain extent
Stabilization or poor performance problem, obtain more comfortable pedal sense and system pressure dynamic characteristic.
Stress control of the present invention by system pressure when too high, is divided into three kinds of situations：Conventional brake, EBD brakings, ABS systems
It is dynamic.In conventional brake and EBD brakings, small step-length pressure is carried out by wheel cylinder pressure-reducing valve and is adjusted, obtain control good enough steady
Qualitative and dynamic effect；In abs braking, by improving control thresholding, preferable control effect is obtained.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to figure, the present invention is further detailed explanation.
Brief description of the drawings
The accompanying drawing for constituting the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate, for explaining the present invention, not constitute inappropriate limitation of the present invention.
Fig. 1 is master cylinder pressure control principle drawing of the invention；
Fig. 2 is wheel cylinder Stress control schematic diagram of the invention；
Fig. 3 is a kind of line control brake system compress control method flow chart based on wheel cylinder pressure-reducing valve of the invention.
Reference：
11 be first control valve, 12 be second control valve, 13 be check valve, 14 be master cylinder, 15 be equivalent restriction,
16 it is plunger displacement pump, 21 be the first equivalent restriction, 22 be the second equivalent restriction, 23 be pressure-reducing valve, 24 is pressure charging valve and 25 is
Wheel cylinder.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the present invention, not
For limiting the present invention.
Wheel cylinder pressure-reducing valve is the pressure-reducing valve for the pressure of wheel braking cylinder control in abs braking anti-lock control process, former scheme
It is not used in master cylinder pressure control；The both sides of master cylinder 14 of appearance when in the present invention, in order to solve to carry out Stress control by valve 12
The instability problem that pressure differential is produced, master cylinder pressure control is carried out using wheel cylinder pressure-reducing valve.
Accompanying drawing 1 is master cylinder Stress control schematic diagram, wherein, lower section 14 is master cylinder, and right side 12 is master cylinder pressure pressure release
Valve.For line control brake system, it is necessary to control the pressure value of master cylinder both sides, and ensure that pressure at both sides is approached.To realize two mesh
's：1) correct master cylinder pressure force value, it is ensured that the severity of braking of brakes；2) suitable brake pedal feedback force, the feedback force
Mainly determined by the difference in areas and pressure differential of the master cylinder left and right sides.In the present invention, enter ABS anti-locks mode of operation and
eP＞ 1.87P
When, opening valve 12 carries out master cylinder pressure control.In the present invention, from unlike original scheme, ABS controls are being introduced into
When making or being unsatisfactory for above formula, valve 12 is kept to be closed, it is to avoid to produce the pressure differential of positive feedback property in master cylinder both sides.
Accompanying drawing 2 is wheel cylinder Stress control schematic diagram, and in actual vehicle, each wheel corresponds to a set of system.Wherein 23
For pressure-reducing valve, 24 are pressure charging valve.In the present invention, when ABS is introduced into, Stress control is carried out by this group of valve.Wherein in routine
During braking, the demand for carrying out independent control due to the pressure to each wheel less, therefore can flexibly with four wheels
Increasing reducer unit carries out master cylinder pressure control, it is necessary to open the valve group when being depressurized, you can master cylinder pressure is controlled, together
When the relief passage be located at master cylinder 14 front end, therefore in dynamic process produce pressure differential brake pedal can be promoted to transport forward
It is dynamic, i.e., it is degeneration factor for whole system, be conducive to control stability；Similarly in EBD control process, due to right
The pressure of front vehicle wheel carries out the demand of independent control less, then can utilize the reducer unit of front-wheel, and master cylinder pressure is controlled
System, is equally also degeneration factor.
Fig. 3 shows a kind of line control brake system compress control method flow chart based on wheel cylinder pressure-reducing valve of the invention.
In compress control method of the invention, Stress control when system pressure is too high is divided into three kinds of situations：Conventional brake, EBD systems
Dynamic, abs braking.
Conventional brake situation：
During conventional brake, with reference to Fig. 2, as shown in Fig. 2 the pressure charging valve in all four wheel cylinder control pressurer system is necessarily located
In connected state, therefore, the system pressure of master cylinder output can be consistent with the wheel cylinder pressure at wheel cylinder.
Under the operating mode, when system pressure is too high, pressure regulation is carried out by the pressure-reducing valve of trailing wheel, because pressure-reducing valve is switch
Valve, therefore carry out small step-length Decompression Controlling.Pressurize step-length is 10-20 controlling cycles, and decompression step-length is public according to pressure divergence control
Formula is as follows：
In formula, ePIt is pressure divergence, P is system pressure, and k, λ are the coefficient related to valve port, can be obtained by surveying.
This control method, from the point of view of whole system, formation is negative feedback loop.It may therefore be assured that control is steady
It is qualitative, and it is favorably improved dynamic control performance.
EBD brake conditions：
Under EBD brake conditions, the pressure charging valve only in front-wheel wheel cylinder control pressurer system is necessarily in connected state, because
This, the system pressure of master cylinder output can be consistent with the wheel cylinder pressure at front-wheel wheel cylinder.
Under the operating mode, when system pressure is too high, pressure regulation is carried out by the pressure-reducing valve of front-wheel, equally carry out small step-length and subtract
Voltage-controlled system.Control strategy is similar with preceding.
It is also possible to ensure the stability of control, and it is favorably improved dynamic control performance.
Abs braking situation：
In the case of abs braking, it is impossible to which the system pressure and the wheel cylinder pressure at each wheel wheel cylinder for ensureing master cylinder output can be protected
Hold consistent.Therefore, it is impossible to directly carry out Stress control using wheel cylinder pressure charging valve, this is particularly important under low attached operating mode.
Now, Stress control can only be carried out by the control valve in accompanying drawing 1, but in order to obtain pedal sense as well as possible
Feel, it is thus necessary to determine that during much pressure divergences, just carry out Stress control.
Designed according to current valve port, when carrying out Stress control by controlling valve, the pedal force transient fluctuation for causing is approximate
For：
Fflu≈0.28P·S
In formula, S is main cylinder area；
And pressure, when there is deviation, the pedal force deviation for causing is approximately：
Fe≈0.1eP·S
Here, F is takenfluThe empirical value of=1.5Fe, as control thresholding empirical value, therefore：
eP＞ 1.87P
When, just it is controlled.
Also, equally carry out small step-length Decompression Controlling.Control strategy is similar with preceding.
Under ABS state of a controls, control thresholding is very big, and under ABS state of a controls, it is inherently subsidiary during wheel cylinder pressurization stages
Downward adjustment effect is carried out to master cylinder pressure.Therefore, under the operating mode, it is seldom necessary to carry out system pressure active decompression.
And under ABS state of a controls by pressure divergence ePThe pedal force for causing changes, due to traditional abs braking system
In the presence of the phenomenon.Therefore, relatively easily received by client.
The present invention solves control in dynamic process caused by master cylinder left and right sides has pressure differential system not to a certain extent
Stabilization or poor performance problem, obtain more comfortable pedal sense and system pressure dynamic characteristic.
Stress control of the present invention by system pressure when too high, is divided into three kinds of situations：Conventional brake, EBD brakings, ABS systems
It is dynamic.In conventional brake and EBD brakings, small step-length pressure is carried out by wheel cylinder pressure-reducing valve and is adjusted, obtain control good enough steady
Qualitative and dynamic effect；In abs braking, by improving control thresholding, preferable control effect is obtained.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (2)
1. a kind of line control brake system compress control method based on wheel cylinder pressure-reducing valve, it is characterised in that comprise the following steps：
S1, judges that the current working condition of system is conventional brake state, EBD on-positions or abs braking state；
S2, in the case where the current working condition of system is conventional brake state, in all four wheel cylinder control pressurer system
Pressure charging valve be in connected state, therefore, master cylinder output system pressure be consistent with the wheel cylinder pressure at wheel cylinder；This
In the case of, when system pressure is too high, pressure regulation is carried out by the pressure-reducing valve (23) of trailing wheel, because pressure-reducing valve (23) is switch
Valve, therefore carry out small step-length Decompression Controlling；
S3, in the case where the current working condition of system is EBD on-positions, only in front-wheel wheel cylinder control pressurer system
Pressure charging valve (24) in connected state, therefore, master cylinder output system pressure can be kept with the wheel cylinder pressure at front-wheel wheel cylinder
Unanimously；In this case, when system pressure is too high, pressure regulation is carried out by the pressure-reducing valve of front-wheel, equally carries out small step-length
Decompression Controlling；
S4, the current working condition of system be abs braking state in the case of, it is impossible to ensure master cylinder output system pressure with
Wheel cylinder pressure at each wheel wheel cylinder can be consistent, it is impossible to directly carry out Stress control using wheel cylinder pressure charging valve (24)；At this
In the case of kind, Stress control is carried out by master cylinder pressure relief valve (12).
2. the line control brake system compress control method based on wheel cylinder pressure-reducing valve according to claim 1, it is characterised in that
It is described Stress control is carried out by master cylinder pressure relief valve (12) to be specially in the step S4：
When carrying out Stress control by master cylinder pressure relief valve (12), the pedal force transient fluctuation for causing is approximately：
Fflu≈0.28P·S
In formula, S is main cylinder area；
And pressure, when there is deviation, the pedal force deviation for causing is approximately：
Fe≈0.1eP·S
Take Fflu=1.5FeEmpirical value, as control thresholding empirical value,
ep＞ 1.87P
When, it is controlled；Also, carry out small step-length Decompression Controlling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528121.3A CN104442762B (en) | 2014-10-09 | 2014-10-09 | A kind of line control brake system compress control method based on wheel cylinder pressure-reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528121.3A CN104442762B (en) | 2014-10-09 | 2014-10-09 | A kind of line control brake system compress control method based on wheel cylinder pressure-reducing valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104442762A CN104442762A (en) | 2015-03-25 |
| CN104442762B true CN104442762B (en) | 2017-06-23 |
Family
ID=52889744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410528121.3A Active CN104442762B (en) | 2014-10-09 | 2014-10-09 | A kind of line control brake system compress control method based on wheel cylinder pressure-reducing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104442762B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113276811B (en) * | 2021-06-17 | 2022-10-28 | 中汽创智科技有限公司 | Pedal feel transmission control method and control system based on braking system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103909912A (en) * | 2014-04-01 | 2014-07-09 | 重庆邮电大学 | Hydraulic brake cylinder pressure estimation method and hydraulic brake cylinder pressure estimation device on basis of electromechanical similarity theory |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4333000B2 (en) * | 1999-12-10 | 2009-09-16 | トヨタ自動車株式会社 | Brake system for vehicles |
| US20040124699A1 (en) * | 2002-12-26 | 2004-07-01 | Westinghouse Air Brake Technologies Corporation | Dual feedback, high accuracy brake cylinder pressure control |
| JP5014919B2 (en) * | 2007-08-17 | 2012-08-29 | 日立オートモティブシステムズ株式会社 | Brake control device |
-
2014
- 2014-10-09 CN CN201410528121.3A patent/CN104442762B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103909912A (en) * | 2014-04-01 | 2014-07-09 | 重庆邮电大学 | Hydraulic brake cylinder pressure estimation method and hydraulic brake cylinder pressure estimation device on basis of electromechanical similarity theory |
Non-Patent Citations (1)
| Title |
|---|
| ABS压力响应测试和压力的精细调节;丁能根等;《机械工程学报》;20040630;第40卷(第6期);第188-191页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104442762A (en) | 2015-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5962906B2 (en) | Vehicle braking force control device | |
| JPWO2010119889A1 (en) | BBW brake system | |
| KR20160071850A (en) | Method for controlling braking force in regenerative brake cooperation system | |
| JP5386043B2 (en) | Brake device for vehicle and control method thereof | |
| WO2015012204A1 (en) | Brake control device | |
| JP5947757B2 (en) | Hydraulic brake system | |
| US20200062229A1 (en) | Brake device for vehicle | |
| US9352655B2 (en) | Brake device for vehicle and control method thereof | |
| CN103223935A (en) | Brake control device for vehicle | |
| US20170313291A1 (en) | Valve module for an air braking system of a heavy vehicle | |
| CN104442762B (en) | A kind of line control brake system compress control method based on wheel cylinder pressure-reducing valve | |
| CN104884317A (en) | Control device for a brake system of a vehicle, and method for operating a brake system of a vehicle | |
| JP2014019266A (en) | Brake device for vehicle | |
| JP4803109B2 (en) | Brake control device | |
| JP6701656B2 (en) | Vehicle braking control device | |
| JP2007050742A (en) | Brake control device of vehicle | |
| JP2014094635A (en) | Master cylinder and master cylinder device | |
| CN205149838U (en) | Drive -by -wire braking and footboard power feedback system | |
| JP6281878B2 (en) | Brake hydraulic pressure control device for vehicles | |
| CN102689628B (en) | brake system control method and device | |
| JP6656049B2 (en) | Vehicle brake control device | |
| Hu et al. | Safety design and matching analysis of electronic hydraulic brake system | |
| CN205440331U (en) | Applied structure of adaptation valve | |
| JP2010111176A (en) | Brake control device | |
| CN105270375A (en) | Brake-by-wire and pedal-force feedback system and braking method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |