Patent US4600244A successfully refreshed from Google Patents.
US4600244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive vehicle anti-brake lock system
Assignee: Robert Bosch GmbH
•
Filing: 1985-05-23
•
Granted: 1986-07-15
•
Expires: 2005-05-23
Abstract
Abstract To simplify the anti-lock brake system in which two brake circuits (I,II) are used, connected to diagonally located wheels (2,3; 1,4), magnetic valves are provided in which one braking circuit fully controls the wheels thereof and the wheels of the other braking circuits are controlled by a slave or follower valve system (9,10) which includes a biassed valve (10) controlling the braking pressure at the front wheel of the second braking circuit (1) with a difference pressure, so that the second slave control valve operates as a differential pressure control valve (10,32). The differential can be controlled as a function of absolute braking pressure, as sensed, for example, by a brake pressure piston (30) and a biassing spring (30a) therefor.
Inventors
- 👤 Heinz Leiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:27
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/343; B60T8/344; B60T8/346
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
358 words
Automotive vehicle wheel anti-lock brake system (ABS) in which two brake circuits (I, II) are provided, acting on first diagonally positioned front and rear wheels (1, 4) and second diagonally positioned front and rear wheels (2, 3) of the vehicle, having a least one rear speed wheel sensor (3a, 4a) coupled to at least one (4) wheels (3, 4) of the vehicle and providing a rear wheel speed signal; a front wheel speed sensor (1a, 20) coupled to at least one of the front wheels (1) of the vehicle and providing a front wheel speed signal; a first magnetic control valve (7, 22, 35) controlling brake fluid pressure at the first rear wheel (4, 4'); a second control valve (9, 9') controlling brake fluid pressure to the second rear wheel (3), coupled to said first, magnetic control valve (7, 22, 35) and forming a first slave control valve, said second control valve controlling brake fluid pressure in the second rear wheel (3) as a function of the operation of the first, and magnetic control valve; and a speed signal processing and control signal generating circuit (8) receiving the wheel speed signals and providing output signals for controlling the first magnetic brake control valve (7, 22, 35) in dependence on the rotational behavior of the wheels, as sensed by said wheel speed signal sensors and provided to said signal processing and control signal generating circuit (8), said system comprising, in accordance with the invention, a third, and magnetic control valve (6, 21) controlling brake fluid pressure at the first front wheel (1), connected to and controlled by the speed signal processing and control signal generating circuit (8) and responding upon a tendency of said front wheel to lock; and a fourth control valve (10,32) controlling brake fluid pressure at the second front wheel (2) coupled to said third, and magnetic control valve (6) and forming a second slave control valve, said fourth control valve forming the second slave valve controlling brake fluid pressure in a brake associated with the second front wheel (2) to a level which differs from the brake pressure applied to the first front wheel (1).
Claim 2
Dependent Claim
358 words
Automotive vehicle wheel anti-lock brake system (ABS) in which two brake circuits (I, II) are provided, acting on first diagonally positioned front and rear wheels (1, 4) and second diagonally positioned front and rear wheels (2, 3) of the vehicle, having a least one rear speed wheel sensor (3a, 4a) coupled to at least one (4) wheels (3, 4) of the vehicle and providing a rear wheel speed signal; a front wheel speed sensor (1a, 20) coupled to at least one of the front wheels (1) of the vehicle and providing a front wheel speed signal; a first magnetic control valve (7, 22, 35) controlling brake fluid pressure at the first rear wheel (4, 4'); a second control valve (9, 9') controlling brake fluid pressure to the second rear wheel (3), coupled to said first, magnetic control valve (7, 22, 35) and forming a first slave control valve, said second control valve controlling brake fluid pressure in the second rear wheel (3) as a function of the operation of the first, and magnetic control valve; and a speed signal processing and control signal generating circuit (8) receiving the wheel speed signals and providing output signals for controlling the first magnetic brake control valve (7, 22, 35) in dependence on the rotational behavior of the wheels, as sensed by said wheel speed signal sensors and provided to said signal processing and control signal generating circuit (8), said system comprising, in accordance with the invention, a third, and magnetic control valve (6, 21) controlling brake fluid pressure at the first front wheel (1), connected to and controlled by the speed signal processing and control signal generating circuit (8) and responding upon a tendency of said front wheel to lock; and a fourth control valve (10,32) controlling brake fluid pressure at the second front wheel (2) coupled to said third, and magnetic control valve (6) and forming a second slave control valve, said fourth control valve forming the second slave valve controlling brake fluid pressure in a brake associated with the second front wheel (2) to a level which differs from the brake pressure applied to the first front wheel (1).
Claim 3
Dependent Claim
51 words
System according to claim 1, including (FIG. 3) means (30) for sensing the braking pressure applied to said first front wheel (1,1') and controlling the difference value in braking pressure applied to the second front wheel (2) as a function of the braking pressure applied to the first front wheel (1).
Claim 4
Dependent Claim
36 words
System according to claim 1, wherein at least the third magnetic control valve (6,21) comprises a three-position valve connected for pressure rise, pressure level maintenance, and pressure drop of brake fluid pressure at the associated wheel.
Claim 5
Dependent Claim
91 words
System according to claim 1, wherein (FIG. 2) the third and magnetic control valve (21) comprises a three-positions valve for controlling pressure rise, pressure level maintenance and pressure drop at the brake of the first front wheel (1); and wherein the first magnetic control valve (22) comprises a two-position valve having a pressurized brake fluid passage position and a brake fluid blocking position, said two-position valve being connected to receive pressurized brake fluid from said third magnetic control valve (21) and controlling brake fluid pressure to the second rear wheel (4,4').
Claim 6
Dependent Claim
48 words
System according to claim 4, wherein the three-position magnetic control valve (21) is connected to the brake of the first front wheel (1') and the output of the two-position valve is connected with the brake of the rear wheel (4') which is directly opposite the first front wheel.
Claim 7
Dependent Claim
25 words
System according to claim 1, including a brake fluid pressure reducer (11) connected between the first magnetic control valve (7,22,35) and the associated rear wheel.
Claim 8
Dependent Claim
27 words
System according to claim 6, wherein said pressure reducer is a controllable pressure reducer, controlling the reduction of pressure as a function of vehicle weight or loading.
Claim 9
Dependent Claim
36 words
System according to claim 1, further including (FIG. 3) a safety valve (33) connected to bridge the second control valve (9 9') for the second rear wheel (3) upon switching off of the anti-lock brake system.
Claim 10
Dependent Claim
26 words
System according to claim 8, wherein, switching off of the anti-lock brake sysem application of pressurized brake fluid to the first rear wheel (4,4') is inhibited.
Claim 11
Dependent Claim
32 words
System according to claim 1, wherein the vehicle is a frontwheel drive vehicle having a front axle differential (5'); and wherein the front wheel speed sensor (20) is coupled to the differential.
Claim 12
Dependent Claim
25 words
System according to claim 1, wherein the front wheel speed sensor (1a) is coupled to and senses the speed of the first front wheel (1,1').
Claim 13
Dependent Claim
28 words
System according to claim 1, wherein each of the rear wheels (3,4) have a rear wheel speed sensor (3a,4a) coupled thereto to provide respective rear wheel speed signals.
Claim 14
Dependent Claim
313 words
Method of controlling braking of an automotive vehicle, in which said automotive vehicle includes a wheel anti-lock brake system (ABS) in which two brake circuits (I,II) are provided, acting on first diagonally positioned front and rear wheels (1,4) and second diagonally positioned front and rear wheels (2,3) of the vehicle, having at least one rear speed wheel sensor (3a, 4a) coupled to at least one (4) of the rear wheels (3, 4) of the vehicle and providing a rear wheel speed signal; a front wheel speed sensor (1a, 20) coupled to at least one of the front wheels (1) of the vehicle and providing a front wheel speed signal; a first magnetic control valve (7,22,35) controlling brake fluid pressure at the first rear wheel (4,4'); a second control valve (9,9') controlling brake fluid pressure to the second rear wheel (3), coupled to said first magnetic control valve (7,22,35) and forming a first slave control valve, said second control valve controlling brake fluid pressure in the second rear wheel (3) as a function of the operation of the first, and magnetic control valve; and a speed signal processing and control signal generating circuit (8) receiving the wheel speed signals and providing output signals for controlling the first magnetic brake control valve (7,22,35) in dependence on the rotational behavior of the wheels, as sensed by said wheel speed signal sensors and provided to said signal processing and control signal generating circuit (8), comprising, in accordance with the invention, the step of controlling brake fluid pressure at the first front wheel (1) upon response of the speed signal processing and control signal generating circuit (8) sensing a tendency of said front wheel to lock, and controlling the brake fluid pressure at the secod front wheel (2) at a level which differs from the braking pressure applied to said first front wheel and at a lower level.
Claim 15
Dependent Claim
313 words
Method of controlling braking of an automotive vehicle, in which said automotive vehicle includes a wheel anti-lock brake system (ABS) in which two brake circuits (I,II) are provided, acting on first diagonally positioned front and rear wheels (1,4) and second diagonally positioned front and rear wheels (2,3) of the vehicle, having at least one rear speed wheel sensor (3a, 4a) coupled to at least one (4) of the rear wheels (3, 4) of the vehicle and providing a rear wheel speed signal; a front wheel speed sensor (1a, 20) coupled to at least one of the front wheels (1) of the vehicle and providing a front wheel speed signal; a first magnetic control valve (7,22,35) controlling brake fluid pressure at the first rear wheel (4,4'); a second control valve (9,9') controlling brake fluid pressure to the second rear wheel (3), coupled to said first magnetic control valve (7,22,35) and forming a first slave control valve, said second control valve controlling brake fluid pressure in the second rear wheel (3) as a function of the operation of the first, and magnetic control valve; and a speed signal processing and control signal generating circuit (8) receiving the wheel speed signals and providing output signals for controlling the first magnetic brake control valve (7,22,35) in dependence on the rotational behavior of the wheels, as sensed by said wheel speed signal sensors and provided to said signal processing and control signal generating circuit (8), comprising, in accordance with the invention, the step of controlling brake fluid pressure at the first front wheel (1) upon response of the speed signal processing and control signal generating circuit (8) sensing a tendency of said front wheel to lock, and controlling the brake fluid pressure at the secod front wheel (2) at a level which differs from the braking pressure applied to said first front wheel and at a lower level.
Claim 16
Dependent Claim
46 words
Method according to claim 13, including the step of sensing braking pressure applied to said first front wheel (1) and controlling the difference in braking pressure applied to said second front wheel (2) as a function of absolute braking pressure applied to the first front wheel.
Claim 17
Dependent Claim
45 words
Method according to claim 13, including the step of controlling braking pressure to the second rear wheel (3) independently of the operation of the first magnetic control valve upon sensing of malfunction, or inoperativeness, or non-connection of the signal processing and control signal generating circuit.
Claim 18
Dependent Claim
39 words
Method according to claim 13, wherein the vehicle is a front-wheel drive vehicle having a front-wheel differential (5'); and the at least one front wheel speed signal is generated by sensing the speed of a gear within said differential.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |