GB2224796A - Braking system - Google Patents
Braking system Download PDFInfo
- Publication number
- GB2224796A GB2224796A GB8921680A GB8921680A GB2224796A GB 2224796 A GB2224796 A GB 2224796A GB 8921680 A GB8921680 A GB 8921680A GB 8921680 A GB8921680 A GB 8921680A GB 2224796 A GB2224796 A GB 2224796A
- Authority
- GB
- United Kingdom
- Prior art keywords
- brake
- braking system
- force booster
- brake force
- piston
- 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.)
- Granted
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
- B60T8/42—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 having expanding chambers for controlling pressure, i.e. closed systems
-
- 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
- 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
- B60T8/48—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 connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
- B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
- B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
- B60T8/4845—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems using a booster or a master cylinder for traction control
Description
X
-1DESCRIPTION BRAKING SYSTEM
The present invention relates to vehicle braking systems.
A vehicle braking system is known (DE-OS- 36 29 776), in whic an adjusting chamber is provided in a cup-shaped part of the housing of a hydraulic brake force booster, and a drive piston is disposed therein. A sealed piston rod, which is connected to a servo piston, projects into the adjusting chamber through a base part of the housing from the brake pedal side which is connected to the hydraulic brake force booster. The sealed piston rod is subjected during drive slip regulation operations to a hydraulic pressure which arises in the adjusting chamber and which is generated by a pressure medium source. At the same time. a pressure force acting in the direction of the brake pedal is built up. This pressure force must be overcome in the event of a braking operation which follows on rapidly after a drive slip regulation operation. The effect of the braking operation, which must have priority in the overall operating of the system, is thus reduced. Furthermore, this arrangement of the drive piston creates unwanted additional expense.
1 k In accordance with the present invention a braking system is provided having a brake force booster, for motor vehicles whose wheels are each associated with a wheel brake cylinder connected by way of a brake line to a multi-circuit master cylinder, the system including at least one control unit associated with at least one of the wheels, the control unit being disposed in the brake line such that, in the event of drive slip regulation, it can take up switching positions for pressure build-up and pressure reduction at one or more wheel brakes, and a valve arrangement, which is connected to a pressure medium source and by way of which pressure medium flows only in the event of drive slip regulation into an adjusting chamber of variable volume and., by way of the hydraulic pressure which is built up, causes a piston of the multi-circuit master cylinder to move in such a way that pressure build-up can be obtained at at least one wheel brake cylinder associated with a driven wheel, the adjusting chamber being defined by a rear face of said piston of the master cylinder which faces the brake force booster.
This has the advantage of a simple design and a small number of individual elements, which advantage is obtained by the formation of an adjusting chamber which is contiguous with the rear face of the first 1 1 piston of the multi-circuit master cylinder. It also has the advantage that, in the event of a braking operation following on rapidly from a drive slip regulation operation or a braking operation required during a drive slip regulation operation, there is no disadvantageous effect as in the known braking systems.
An advantageous development is to provide the adjusting chamber with a circular ring-shaped cross section.
A further advantage is that the multi-circuit master cylinder, which is provided with the adjusting chamber, can be operated readily both by means of a vacuum brake force booster and by means of a hydrauli brake force booster.
The invention is further described hereinafter, by way of example only, with reference to the accompanying drawings, in which: - Fig.1 illustrates a first embodiment of a braking system constructed in accordance with the invention; and Fig.2 is a partial representation of a second embodiment of a braking system constructed in accordance with the invention.
A braking system 100 for motor vehicles, as illustrated in Fig.1, has a known brake force booster 1, a multi-circuit master cylinder 2 and a pressure k -4medium reservoir 3. Brake lines 6,7 lead from brake circuit chambers 4, 5 respectively of master cylinder 2 and at least one of these lines leads to a drive-slipregulated wheel brake cylilnder 11, lla, 12, 12a of a brake circuit.
At least one control unit 13,14 which is known from DE-PS- 31 37 287, is connected in the brake lines 6,7, and may have electrically controllable solenoid valves associated with the wheel brake cylinders as well as, for example, a return pump.
The method of operation and the advantages of the known control unit 13, 14 need not be described here.
The control unit 13,14 can also be used in a known way for anti-skid control operation. In this case, as well as in the case of drive slip regulation, the solenoid valves disposed in the control unit and associated with the wheel brake cylinders are controllable by an electronic control device 17, which is connected by way of electrical lines to sensors 15, 15a; 16,16a disposed on the wheels, in such a way that pressure build-up and pressure reduction can take place at the wheel brake cylinders.
The master cylinder 2 is provided with a substantially cylindrical housing 20 and is connected to a housing 68, which comprises two moulded parts in the shape of half shellsS of the brake force booster 2 A 1, which is in the form of a vacuum brake force booster. The pressure medium reservoir 3 is connected to the master cylinder 2 by way of lines 21,22. The pressure medium reservoir 3 is also connected to a valve arrangement 40 and, when the valve arrangement 40 is open, from there to an adjusting chamber 23 in the master cylinder 2, which has an annular cross section.
The adjusting chamber 23 extends towards the brake pedal 24 and is defined at one end by a rear face 25 of a first piston 29, disposed in the direction of actuation of the brake force booster, of the master cylinder 2, which rear face faces the brake pedal 24 and is of annular shape. The outer cylindrical perimeter of the adjusting chamber 23 is defined by a guide bore 30 in the housing 20 which guides the first piston 29. The inner perimeter of the adjusting chamber 23 is defined by the cylindrical outer surface 31 of a piston rod 35 fixedly connected to the first piston 29. The other end of the adjusting chamber 23 is defined by an end face 32 of a cylinder sleeve 33, which is mounted in the guide bore 30 so as to be fixed to the housing. The piston rod 35 projects through a bore 34 in the cylinder sleeve 33 and is sealingly guided therein.
1 A line 39 leads from the adjusting chamber 23 by way of the valve arrangement 40, which is open in the no n-energised state, to a line portion 41, which is connected to the pressure medium reservoir 3 and to the inlet side 42 of a self-priming pump element 43, which serves as a pressure medium source, and the outlet side 47 of an excess-pressure valve 48.
A further line 50 leads from the outlet side 49 of the self-priming pump element 43 through a non-return valve 52, which opens in the direction of a pressure medium accumulator 513 and from the non-return valve 52 to a connection 56 of the valve arrangement 40, which is closed when in the non-energised state, as well as to the pressure medium accumulator 51 and an inlet side 57 of the excess-pressure valve 48.
When energised, the valve arrangement 40 takes up a position 58 in which, in the event of drive slip regulation, it connects the further line 50, issuing from the outlet side 49 of the pump element 43, to the line 39 to the adjusting chamber 23, and breaks the connection between the adjusting chamber 23 and the line portion 41.
In the embodiment according to Fig.2, which is a partial representation of Fig.1, in which the same reference numerals have been used for components which are the same and have the same effect as in the 4 embodiment in Fig.1, the multi-circuit master cylinder 2 is fixedly connected to a substantially cylindrical housing 69 of the brake force booster 1, which is in the form of a hydraulic brake force booster of a known type.
Downstream of the non-return valve 52, a further line 50 leading to the closed connection 56 of the valve arrangement 40 is connected to a line portion 60 which leads to an inlet connection 59 on the brake force booster 1, the line portion 60 thus being connected to the adjusting chamber 23 in the event of drive slip regulation. A brake valve of a known construction is disposed downstream of the inlet connection 59 in the brake force booster 1 and pressure medium is thus immediately available to it when required.
The pressure medium reservoir 3 is connected by a further line portion 61 to a pressure medium chamber 62 of variable volume, which is formed in the brake force booster 1 and which remains in a substantially pressureless state and into which a known servo piston of the hydraulic brake force booster 1 projects in a known manner.
The known method of operation of the normal braking system in the embodiments in Figs. 1 and 2 remains unaffected by the particular valve arrangement i as well as by the arrangement of the adjusting chamber 23 in the master cylinder 2.
If one or more of the wheels locks, the sensors 15,15a; 16,16a, which are disposed in a known way on the wheels, transmit signals to the electronic control device 17, by way of which the control unit 13,4 is then actuated, and the necessary pressure modulation for anti-skid regulation takes place at the wheel brake cylinders 11,11a; 12,12a.
If, on moving off, one of the wheels attempts to leave the state in which it acts to drive the vehicle, this is detected in a known way by one or more of the sensors 15,15a; 16,16a and is transmitted as a signal to the electronic control device 17, which activates the valve arrangement 40 and the control unit 13,14 to effect drive slip regulation.
The wheel brake cylinders 11,11a; 12,12a are associated with at least one drive wheel of a motor vehicle axle and., for the purpose of drive slip regulation, may be regulated individually or together.
The method of operation in the event of drive slip regulation is now described:
In the event of drive slip regulation, a controlled switch-over operation moves the valve arrangement 40 into the position 58, thus establishing a connection between the adjusting chamber 23 and the k A -9pressure medium accumulator 51 and the outlet side 49 of the pump element 43.
The inlet side 42 of the pump element 43, which is switched on at the same time, is permanently connected to the pressure medium reservoir 3 and conveys pressure medium under hydraulic pressure from the outlet side 49 into the other line 50 and hence into the adjusting chamber 23. The pressure force acting on the rear face 25 of the first piston 29, which is disposed in the direction of actuation, moves the first piston 29, which acts as an adjusting piston, in the direction of the brake circuit chamber 4 and causes pressure to build up therein.
Pressure medium is thus conveyed from the brake circuit chamber 4 and from a further brake circuit 5, which is contiguous therewith and separated therefrom by a second piston 66, to at least one wheel brake cylinder 11,11a; 12,12a, and pressure build-up is made possible at one or more drive wheels.
The wheel brake cylinders which are not associated with a drive wheel or which are not to be regulated are each separated off from the brake circuit 4,5 by a solenoid valve of the control unit 13,14, which valve is in the closed position.
If it becomes necessary to modulate the pressure at one wheel brake cylinder 11,11a; 12,12a, in the v -10case of pressure-holding, one solenoid valve, which is associated with a wheel brake cylinder 11,11a; 12,12a, of the control unit 13,14 is switched into a holding position.
If subsequent pressure reduction is indicated at the regulated wheel brake cylinder 11,11a; 12,12a, the solenoid valve of the control unit 13, 14 associated with the wheel brake cylinder is switched into a pressure reduction position and, for example, the pressure medium removed by the return pump of the control unit 13,14 from this wheel brake cylinder is conveyed to a brake circuit chamber 4,5.
If a braking operation follows on very rapidly from the drive slip regulation operation, the brake pedal 24 comes into contact, when pressed, with a switch 67, for example a brake light switch, and the switch 67 generates a signal by way of an electrical line to the electronic control device 17, which signal is transmitted in such a way that the control unit 13,14 and the valve arrangement 40 are switched into their initial positions.
. 1 zt 4 j -1.
Claims (8)
1. A braking system having a brake force booster, for motor vehicles whose wheels are each associated with a wheel brake cylinder connected by way of a brake line to a multi-circuit master cylinder, the system including at.least one control unit associated with at least one of the wheels, the control unit being disposed in the brake line such that, in the event of drive slip regulation. it can take up switching positions for pressure build-up and pressure reduction at one or more wheel brakes, and a valve arrangement, which is connected to a pressure medium source and by way of which pressure medium flows only in the event of drive slip regulation into an adjusting chamber of variable volume and, by way of the hydraulic pressure which is built up, causes a piston of the multi- circuit master cylinder to move in such a way that pressure build-up can be obtained at at least one wheel brake cylinder associated with a driven wheel, the adjusting chamber being defined by a rear face of said piston of the master cylinder which faces the brake force booster.
2. A braking system as claimed in claim 1, wherein a cylinder sleeve also serving to define the adjusting chamber, is fixed in a guide bore accommodating the said piston in the master cylinder and facing the brake force booster.
1
3. A braking system as claimed in either claim 1 or 2, wherein the adjusting chamber has an annular cross-section.
-
4. A braking system as claimed in claim 3, wherein a piston rod, which is fixedly connected to said piston, extends through the adjusting chamber in the direction of the brake force booster and is sealingly, axially movably mounted in a bore in the cylinder sleeve.
5. A braking system as claimed in any preceding claim, wherein the brake force booster is in the form of a vacuum brake force booster.
6. A braking system as claimed in any of claims 1 to 4, wherein the brake force booster is in the form of a hydraulic brake force booster.
7. A braking system as claimed in claim 6, wherein the pressure medium source is a self-priming pump element, whose outlet side is permanently connected to an inlet connection of the hydraulic brake force booster, which connection is disposed upstream of a brake valve.
8. A braking system, constructed and adapted to operate substantially as herein described with reference to and as illustrated in the accompanying drawings.
Pubhshed1990 at The Patent Office. Stateel-louse.66 71 High Holborn. London WC1R4TP Further copies maybe obtained from 7,pePatentOffICE Sales Branch. St Mary Cr.aQ. Orpington. Kent BR5 3RD. Printed by Multiplex techniques ltd. St Ma-y Cray. Ken'. Con 18-
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19883832722 DE3832722A1 (en) | 1988-09-27 | 1988-09-27 | BRAKE SYSTEM |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8921680D0 GB8921680D0 (en) | 1989-11-08 |
| GB2224796A true GB2224796A (en) | 1990-05-16 |
| GB2224796B GB2224796B (en) | 1992-08-05 |
Family
ID=6363777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8921680A Expired - Lifetime GB2224796B (en) | 1988-09-27 | 1989-09-26 | Braking system |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH02169355A (en) |
| DE (1) | DE3832722A1 (en) |
| FR (1) | FR2636905A1 (en) |
| GB (1) | GB2224796B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3932148A1 (en) * | 1989-09-27 | 1991-04-04 | Bosch Gmbh Robert | BRAKE POWER AMPLIFIER |
| DE4400688C2 (en) * | 1993-07-27 | 1998-10-15 | Lucas Ind Plc | Vehicle brake system with an electronically controlled amplifier |
| DE4446525A1 (en) * | 1994-12-24 | 1996-06-27 | Teves Gmbh Alfred | Hydraulic motor vehicle brake system |
| DE19531317A1 (en) * | 1995-08-25 | 1997-02-27 | Teves Gmbh Alfred | Actuating unit for a brake system with traction control and / or driving stability control |
| DE19603871A1 (en) * | 1996-02-03 | 1997-08-07 | Teves Gmbh Alfred | Slip-controlled hydraulic brake system with charge pump |
| DE19641821A1 (en) * | 1996-10-10 | 1998-04-16 | Teves Gmbh Alfred | Brake pressure transmitter for car hydraulic brake installation |
| DE19731962C2 (en) * | 1997-07-24 | 2000-08-03 | Lucas Ind Plc | Fully hydraulic brake booster / master cylinder unit |
| DE69927928T2 (en) * | 1999-01-11 | 2006-07-27 | Toyota Jidosha K.K., Toyota | braking system |
| JP4482981B2 (en) | 1999-10-04 | 2010-06-16 | トヨタ自動車株式会社 | Brake hydraulic pressure control device |
| US6953229B2 (en) | 2000-12-28 | 2005-10-11 | Toyota Jidosha Kabushiki Kaisha | Hydraulic braking system and method with flow control device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2184506A (en) * | 1985-12-20 | 1987-06-24 | Teves Gmbh Alfred | Hydraulic brake system |
| GB2193768A (en) * | 1986-07-14 | 1988-02-17 | Teves Gmbh Alfred | Hydraulic brake system for automotive vehicles |
| EP0267018A2 (en) * | 1986-11-05 | 1988-05-11 | LUCAS INDUSTRIES public limited company | Improvements in hydraulic systems for vehicles |
| EP0279981A1 (en) * | 1987-02-09 | 1988-08-31 | LUCAS INDUSTRIES public limited company | Improvements in hydraulic booster and master cylinder assemblies for vehicle braking systems |
| GB2217411A (en) * | 1988-04-12 | 1989-10-25 | Lucas Ind Plc | Improvements in hydraulic systems for vehicles |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3240680A1 (en) * | 1982-11-04 | 1984-05-10 | Robert Bosch Gmbh, 7000 Stuttgart | MAIN BRAKE CYLINDER |
| JPS59134038A (en) * | 1983-01-21 | 1984-08-01 | Aisin Seiki Co Ltd | Automatic brake system |
| DE3629776A1 (en) * | 1986-09-02 | 1988-03-10 | Teves Gmbh Alfred | HYDRAULIC BRAKE SYSTEM FOR MOTOR VEHICLES |
-
1988
- 1988-09-27 DE DE19883832722 patent/DE3832722A1/en not_active Withdrawn
-
1989
- 1989-09-26 GB GB8921680A patent/GB2224796B/en not_active Expired - Lifetime
- 1989-09-27 JP JP25170589A patent/JPH02169355A/en active Pending
- 1989-09-27 FR FR8912664A patent/FR2636905A1/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2184506A (en) * | 1985-12-20 | 1987-06-24 | Teves Gmbh Alfred | Hydraulic brake system |
| GB2193768A (en) * | 1986-07-14 | 1988-02-17 | Teves Gmbh Alfred | Hydraulic brake system for automotive vehicles |
| EP0267018A2 (en) * | 1986-11-05 | 1988-05-11 | LUCAS INDUSTRIES public limited company | Improvements in hydraulic systems for vehicles |
| EP0279981A1 (en) * | 1987-02-09 | 1988-08-31 | LUCAS INDUSTRIES public limited company | Improvements in hydraulic booster and master cylinder assemblies for vehicle braking systems |
| GB2217411A (en) * | 1988-04-12 | 1989-10-25 | Lucas Ind Plc | Improvements in hydraulic systems for vehicles |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2636905A1 (en) | 1990-03-30 |
| GB8921680D0 (en) | 1989-11-08 |
| GB2224796B (en) | 1992-08-05 |
| DE3832722A1 (en) | 1990-03-29 |
| JPH02169355A (en) | 1990-06-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930926 |