GB1463894A - Anti-lock control system for fluid pressure operated vehicle brakes - Google Patents
Anti-lock control system for fluid pressure operated vehicle brakesInfo
- Publication number
- GB1463894A GB1463894A GB672474A GB672474A GB1463894A GB 1463894 A GB1463894 A GB 1463894A GB 672474 A GB672474 A GB 672474A GB 672474 A GB672474 A GB 672474A GB 1463894 A GB1463894 A GB 1463894A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gate
- signal
- circuit
- valve
- delay time
- 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.)
- Expired
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
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
- B60T8/1761—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
- B60T8/17613—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure based on analogue circuits or digital circuits comprised of discrete electronic elements
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
1463894 Anti-lock braking system WABCO WESTINGHOUSE GmbH 14 Feb 1974 [15 Feb 1973] 6724/74 Heading F2F An anti-lock fluid pressure braking system has a signalling device to supply signals - b, #V, + b 1 , +b 2 indicative of the rotational behaviour of the wheel to an electronic control device comprising a normally open inlet solenoid valve 17 and a normally closed outlet solenoid valve 18 operable to control the braking pressure in a brake cylinder wherein the control device also includes a time control device 28 responsive to the start of a renewed increase in brake pressure caused by a re-opening of the valve 17 following a relaxation of that pressure under the control of a signal from the signalling device to control the valves 17, 18 to cause a rapid increase in brake pressure during a time determined by the time control device 28. The signal - b is generated when wheel deceleration exceeds a threshold value, the signal #V is generated when wheel speed falls below a threshold value, the signal +b 1 is generated when wheel acceleration exceeds a first threshold value, and the signal +b 2 is generated when wheel acceleration exceeds a second higher threshold value: as shown in Fig. 1 these signals are applied to OR gates 19, 20, 21 and to AND gates (having negated inputs) 22, 23, 24, 25, 27 of the electronic control device as illustrated. When the - b signal is evolved the signal passes through OR gate 19 and AND gate 25 to close valve 17 and through OR gate 21 to open valve 18 to reduce brake pressure in the cylinder ; when signal - b is terminated the valve 18 is closed although the #V signal if present keeps valve 17 closed to hold the brake pressure constant. If the subsequent wheel acceleration exceeds the first threshold value, the + b 1 signal is produced and via the OR-gate 20, a slowrelease circuit 26, the AND-gate 27, the OR- gate 19 and the AND-gate 25 keeps valve 17 closed even after the #V signal has been terminated. Should signal +b 2 be generated the valve 17 is opened by the action of gate 25. If the wheel acceleration falls below the first acceleration threshold, the +b 1 signal stops but the circuit 26 maintains its output for a period adequate for the subsequent control action. Since no +b 1 signal appears at the corresponding negated input of the AND-gate 23, the AND-gate 23 applies a signal to the AND-gate 27 terminating the closure of valve 17. This signal also actuates device 28 which in this embodiment is in the form of a slow-response circuit, and until the end of the delay time determined by the circuit 28 neither of the valves 17, 18 is actuated and the brake pressure increases rapidly-the increase may be determined by a modulating valve in series with valves 17, 18. At the end of the delay time the circuit 28 applies an output signal to a slow-release circuit 30 which determines the pulse duration of pulses from a generator 29 which are applied via AND- gate 22, OR-gate 19 and AND-gate 25 to the inlet solenoid valve 17. In this pulsed phase the brake pressure rises in a series of steps. When the next - b signal appears, a new control cycle begins. In the modification of Fig. 3 the circuit 28 is replaced by an arrangement 28<SP>1</SP> which is controlled by means of a pressure switch 31 acted upon by the pressure p of the brake cylinder. When the +b 1 signal stops, the signal from gate 23 is applied to the inputs of AND-gates 32, 33 36. If switch 31 is open AND-gate 36 will actuate a slow-release circuit 37, the output signal, of which blocks AND-gate 33 and enables AND- gate 32. Gate 32 actuates a slow-response circuit 34 which has a relatively short delay time at the end of which, via OR-gate 38, the slowrelease circuit 30 is actuated. Should the brake pressure be sufficient to close switch 31, a signal from AND-gate 23 is applied via AND-gate 33 to a slow-response circuit 35 which has a longer delay time. Several pressure switches having different closing pressures with respective slowresponse circuits may be provided. In the modification of Fig. 4 the circuit 28 is replaced by an arrangement 2811 responsive to the - b signal which is applied through a lining circuit 44 having a slow-response and a slowrelease to control gates 39, 40. If the duration of the - b signal lies below the response delay time of circuit 44, the short response delay time of a circuit 41 is used for the brake pressure reestablishment because the gate 39 is open. If the duration of the - b signal is above the delay time of the first stage of the circuit 44, the long response delay time of a circuit 42 is used for the brake pressure re-establishment because the gate 40 is open.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19732307368 DE2307368B2 (en) | 1973-02-15 | 1973-02-15 | Circuit arrangement for an anti-lock vehicle brake system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1463894A true GB1463894A (en) | 1977-02-09 |
Family
ID=5871945
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB672474A Expired GB1463894A (en) | 1973-02-15 | 1974-02-14 | Anti-lock control system for fluid pressure operated vehicle brakes |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS5945536B2 (en) |
DE (1) | DE2307368B2 (en) |
FR (1) | FR2217194B1 (en) |
GB (1) | GB1463894A (en) |
IT (1) | IT994680B (en) |
NL (1) | NL182463C (en) |
SU (1) | SU689607A3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2193276A (en) * | 1986-08-02 | 1988-02-03 | Automotive Products Plc | Vehicle anti-lock braking |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2460904C2 (en) * | 1974-12-21 | 1987-03-19 | Robert Bosch Gmbh, 7000 Stuttgart | Anti-lock braking system |
DE2655165C2 (en) * | 1976-12-06 | 1989-04-27 | Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover | Circuit arrangement for generating control signals for solenoid valves for regulating the brake pressure in an anti-lock vehicle brake system |
DE2706278A1 (en) * | 1977-02-15 | 1978-08-17 | Bosch Gmbh Robert | ANTI-LOCK CONTROL SYSTEM |
US4266833A (en) * | 1978-01-18 | 1981-05-12 | Honda Giken Kogyo Kabushiki Kaisha | Method of preventing skid of wheels of a vehicle |
DE3402795C2 (en) * | 1983-02-26 | 1987-04-16 | Robert Bosch Gmbh, 7000 Stuttgart | Circuit arrangement for controlling the brake pressure in anti-lock vehicle braking systems |
JPS6177727A (en) * | 1984-09-25 | 1986-04-21 | Matsushita Electric Ind Co Ltd | Thermocouple type infrared detecting element |
DE3634241A1 (en) * | 1986-10-08 | 1988-04-21 | Bosch Gmbh Robert | ANTI-BLOCKING CONTROL SYSTEM |
AT390415B (en) * | 1987-04-29 | 1990-05-10 | Steyr Daimler Puch Ag | BRAKE DEVICE FOR 4WD BRAKED MOTOR VEHICLES |
DE3805270A1 (en) * | 1988-02-19 | 1989-08-31 | Lucas Ind Plc | METHOD FOR REGULATING THE BRAKE PRESSURE IN A BLOCK-PROTECTED VEHICLE BRAKE SYSTEM |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3556614A (en) * | 1969-02-24 | 1971-01-19 | Goodyear Tire & Rubber | Antiskid system featuring brake pressure dump limiting as a function of runway coefficient |
-
1973
- 1973-02-15 DE DE19732307368 patent/DE2307368B2/en not_active Ceased
- 1973-08-24 IT IT6954873A patent/IT994680B/en active
- 1973-11-30 JP JP48133664A patent/JPS5945536B2/en not_active Expired
-
1974
- 1974-02-07 SU SU741994668A patent/SU689607A3/en active
- 1974-02-14 GB GB672474A patent/GB1463894A/en not_active Expired
- 1974-02-15 FR FR7405151A patent/FR2217194B1/fr not_active Expired
- 1974-02-15 NL NL7402120A patent/NL182463C/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2193276A (en) * | 1986-08-02 | 1988-02-03 | Automotive Products Plc | Vehicle anti-lock braking |
GB2193276B (en) * | 1986-08-02 | 1990-01-24 | Automotive Products Plc | Vehicle antilock braking system |
Also Published As
Publication number | Publication date |
---|---|
JPS5945536B2 (en) | 1984-11-07 |
FR2217194A1 (en) | 1974-09-06 |
NL7402120A (en) | 1974-08-19 |
NL182463C (en) | 1988-03-16 |
DE2307368B2 (en) | 1980-05-14 |
FR2217194B1 (en) | 1976-11-26 |
JPS49113087A (en) | 1974-10-28 |
NL182463B (en) | 1987-10-16 |
IT994680B (en) | 1975-10-20 |
SU689607A3 (en) | 1979-09-30 |
DE2307368A1 (en) | 1974-09-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19940213 |