US3905653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-lock control system with common hydraulic step-by-step valve
Assignee: Robert Bosch GmbH
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Filing: 1973-10-02
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Granted: 1975-09-16
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Expires: 1993-10-02
Abstract
Abstract An anti-lock control system for the wheel brakes of a vehicle comprises an evaluation circuit responding to the rotary behavior of at least two wheels and a hydraulic step-by-step valve controlled by the evaluation circuit to provide different combinations of pressure gradients in brake channels connected to the wheel brakes.
Inventors
- 👤 Paul Muller
- 👤 Heinz Leiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:55
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60S; B60S1/00; B60S1/02; B60S1/04; B60S1/06; B60S1/12; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/148; B60T8/321; B60T8/328; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/87281; Y10T137/8729; Y10T137/87298; Y10T137/87306; Y10T137/87314
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
161 words
An anti-lock control system for the wheel brakes of a vehicle comprising: means for sensing the rotary behaviour of at least two wheels of said vehicle; an evaluation circuit means, responsive to the output signals from said sensing means, for producing control signals dependent on said sensed rotary behaviour of said at least two wheels; a plurality of individual brake channels connected to the wheel brakes of the vehicle wheels; a hydraulic step-by-step valve connected to all of said brake channels, said step-by-step valve having different passages for each of said brake channels which permit the variation of pressure with different selected gradients in each associated brake channel, and having different combinations of pressure gradients for said plurality of brake channels in its individual stepping positions; and means, responsive to said control signals produced by said evaluation circuit means, for adjusting the stepping position of said step-by-step valve to provide the desired different combinations of pressure gradients in said brake channels.
Claim 2
Dependent Claim
161 words
An anti-lock control system for the wheel brakes of a vehicle comprising: means for sensing the rotary behaviour of at least two wheels of said vehicle; an evaluation circuit means, responsive to the output signals from said sensing means, for producing control signals dependent on said sensed rotary behaviour of said at least two wheels; a plurality of individual brake channels connected to the wheel brakes of the vehicle wheels; a hydraulic step-by-step valve connected to all of said brake channels, said step-by-step valve having different passages for each of said brake channels which permit the variation of pressure with different selected gradients in each associated brake channel, and having different combinations of pressure gradients for said plurality of brake channels in its individual stepping positions; and means, responsive to said control signals produced by said evaluation circuit means, for adjusting the stepping position of said step-by-step valve to provide the desired different combinations of pressure gradients in said brake channels.
Claim 3
Dependent Claim
93 words
An anti-lock control system as defined in claim 1 wherein: said sensing means include sensors for sensing the rotary behaviour of said at least two wheels; said evaluation circuit means includes first means for determining the necessary pressure gradients in dependence on said sensed rotary behaviour and second means responsive to said first means for providing said control signals for controlling the position of said hydraulic step-by-step valve; and said step-by-step valve has a plurality of stepping positions corresponding to all possible desirable combinations of pressure gradients in said plurality of brake channels.
Claim 4
Dependent Claim
136 words
An anti-lock control system as defined in claim 1 wherein: there are n brake channels; said hydraulic step-by-step valve has one stepping position in which an unthrottled pressure rise is possible in all n brake channels and a plurality of other stepping positions wherein a small pressure rise is provided in (n - 1) brake channels and one of the desired different pressure gradients is provided in the nth brake channel; and said evaluation circuit means is responsive to an output signal from said sensing means indicative of a tendency to lock on the part of the wheel or wheel group associated with said nth channel for producing control signals to position said hydraulic step-by-step valve to the individual stepping positions with different pressure gradients associated with said nth channel to eliminate said tendency to lock.
Claim 5
Dependent Claim
60 words
An anti-lock control system as defined in claim 3, wherein said evaluation circuit means includes means for varying said pressure gradient in said nth channel associated with said wheel or wheel group until said sensing means detect that said wheel or wheel group is in a stable state and means to maintain a small pressure rise in the other channels.
Claim 6
Dependent Claim
19 words
An anti-lock control system as defined in claim 1, wherein said evaluation circuit means defines a single evaluation channel.
Claim 7
Dependent Claim
49 words
An anti-lock control system as defined in claim 5, wherein said sensing means comprises sensors for sensing said rotary behaviour of said at least two wheels and said system further comprises means for feeding output signals of said sensors cyclically one after the other to said single evaluation channel.
Claim 8
Dependent Claim
71 words
An anti-lock control system as defined in claim 6 and comprising means for interrupting the cyclic feeding of said output signals of said sensors if the output signal of one of said sensors indicates a tendency to lock on the part of its associated wheel and for restarting said cyclic feeding when said output signal of said one of said sensors indicates that its associated wheel is in a stable state.
Claim 9
Dependent Claim
83 words
An anti-lock control system as defined in claim 7, wherein the movable member of the step-by-step valve comprises a plurality of zones, each associated with a brake channel and each having its valve positions for varying brake pressure adjacent in that zone, and wherein means are provided for moving, when a new sensor is switched on, the movable member to a position in which only small movement is necessary to make the single valve positions of the zone corresponding to that sensor effective.
Claim 10
Dependent Claim
22 words
An anti-lock control system as defined in claim 1, wherein said step-by-step valve comprises a stator and a rotor rotatable relative thereto.
Claim 11
Dependent Claim
32 words
An anti-lock control system as defined in claim 9, and comprising a continuously running drive for said rotor and clutch means for coupling and uncoupling said rotor to and from said drive.
Claim 12
Dependent Claim
16 words
An anti-lock control system as defined in claim 10, wherein said drive comprises an electric motor.
Claim 13
Dependent Claim
17 words
An anti-lock control system as defined in claim 10, and comprising further devices driven by said drive.
Claim 14
Dependent Claim
18 words
An anti-lock control system as defined in claim 10 wherein said clutch means comprises an hydraulically actuated clutch.
Claim 15
Dependent Claim
30 words
An anti-lock control system as defined in claim 1, wherein said step-by-step valve comprises a housing and a piston movable in said housing in the longitudinal direction of said housing.
Claim 16
Dependent Claim
19 words
An anti-lock control system as defined in claim 14, further comprising an hydraulic drive for said hydraulic step-by-step valve.
Claim 17
Dependent Claim
28 words
An anti-lock control system as defined in claim 1, further comprising a pump and a downstream connected pressure reservoir for providing a pressure source for the wheel brakes.
Claim 18
Dependent Claim
69 words
An anti-lock control system as defined in claim 16, and comprising two brake circuits and a second smaller downstream connected pressure reservoir, said pump and said first downstream connected pressure reservoir acting as the pressure source for the most important of said two brake circuits and said pump and said second downstream connected pressure reservoir acting as the pressure source for the least important of said two brake circuits.
Claim 19
Dependent Claim
19 words
An anti-lock control system as defined in claim 17, and further comprising an electric motor for driving said pump.
Claim 20
Dependent Claim
23 words
An anti-lock control system as defined in claim 18 and comprising means driven by said elEctric motor for driving said hydraulic step-by-step valve.
Claim 21
Dependent Claim
24 words
An anti-lock control system as defined in claim 16, and comprising means actuated by said pressure source for driving windshield wipers for said vehicle.
Claim 22
Dependent Claim
30 words
An anti-lock control system as defined in claim 17, and comprising means actuated by said pressure source for said most important brake circuit for driving windshield wipers for said vehicle.
Claim 23
Dependent Claim
46 words
An anti-lock control system as defined in claim 1 and comprising a piston and cylinder connected to the steering linkage of said vehicle and means for supplying to said piston and cylinder pressure fluid acting on opposite sides of said piston for adjusting said steering linkage.
Claim 24
Dependent Claim
42 words
An anti-lock control system as defined in claim 22 and comprising means for supplying pressure fluid from a pressure source provided for brake actuation to one side of the piston in dependence on the actuation of a steering wheel of said vehicle.
Claim 25
Dependent Claim
50 words
An anti-lock control system as defined in claim 22 and comprising means for supplying the brake pressures of steered wheels of said vehicle to opposite sides of said piston to compensate said steering linkage for the force acting thereon as a result of different brake pressures at said steered wheels.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |