Patent US4565411A successfully refreshed from Google Patents.
US4565411A
Expired / Lapsed
US
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Hydraulic brake system with slip control
Assignee: ITT Inc
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Filing: 1984-07-11
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Granted: 1986-01-21
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Expires: 2004-07-11
Abstract
Abstract A hydraulic brake system with slip control for automotive vehicles, with a pedal-operable braking pressure generator (1, 2) and with wheel brakes (16, 17, 22, 23) connected to the braking pressure generator, in which brake system between the braking pressure generator (1, 2) and wheel brakes (16, 17, 22, 23) valve means (14, 15, 18, 19, 24, 26) are arranged which are controllable by slip control electronics and by means of which the connections to the wheel brakes (16, 17, 22, 23) may be locked and connections may be established between the wheel brakes (16, 17, 22, 23) and a storage reservoir (21). For control of the acceleration slip by means of the slip control electronics in the brake system wheel brakes (22, 23) associated with the driven wheels communicate with an auxiliary pressure source (6) by way of a normally locking connecting valve (25) controllable by the slip control electronics.
Inventors
- 👤 Wolfram Seiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:43
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/145; B60T13/146; B60T8/00; B60T8/32; B60T8/321; B60T8/322; B60T8/34; B60T8/48; B60T8/4809; B60T8/4827; B60T8/4836
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
212 words
A hydraulic brake system with slip control for automotive vehicles comprising: a plurality of wheel brakes operating on a like plurality of wheels, at least one wheel being driven; a pedal-operable braking pressure generator having a first piston defining a first chamber and a second piston defining a second chamber; an unpressurized reservoir; a pressure accumulator hydraulically connected to said first chamber by a brake valve; a first brake system valve means normally connecting at least one of said brake wheels with said second chamber; a second brake system valve means normally connecting said driven wheel brakes with said first chamber; a third brake system valve means normally interrupting flow between said wheel brakes and said unpressurized reservoir; a fourth brake system valve means normally interrupting flow between said driven wheel brakes and said pressure accumulator; whereby said slip control closes at least one of said first and second brake system valve means in response to a first predetermined input control signal; and whereby said slip control closes at least one of said first and second valve means and opens said third valve means in response to a second predetermined input control signal; and whereby said slip control opens said fourth valve means in response to a third predetermined input control signal.
Claim 2
Dependent Claim
212 words
A hydraulic brake system with slip control for automotive vehicles comprising: a plurality of wheel brakes operating on a like plurality of wheels, at least one wheel being driven; a pedal-operable braking pressure generator having a first piston defining a first chamber and a second piston defining a second chamber; an unpressurized reservoir; a pressure accumulator hydraulically connected to said first chamber by a brake valve; a first brake system valve means normally connecting at least one of said brake wheels with said second chamber; a second brake system valve means normally connecting said driven wheel brakes with said first chamber; a third brake system valve means normally interrupting flow between said wheel brakes and said unpressurized reservoir; a fourth brake system valve means normally interrupting flow between said driven wheel brakes and said pressure accumulator; whereby said slip control closes at least one of said first and second brake system valve means in response to a first predetermined input control signal; and whereby said slip control closes at least one of said first and second valve means and opens said third valve means in response to a second predetermined input control signal; and whereby said slip control opens said fourth valve means in response to a third predetermined input control signal.
Claim 3
Dependent Claim
33 words
The hydraulic brake system as claimed in claim 1 wherein said fourth valve means also disconnects said driven wheel brakes from said first chamber in response to said third predetermined input control signal.
Claim 4
Dependent Claim
25 words
The hydraulic brake system as claimed in claim 2 including a one-way valve included hydraulically between said second chamber and said wheel brakes connected thereto.
Claim 5
Dependent Claim
20 words
The hydraulic brake system as claimed in claim 1 wherein each said valve means is an electromagnetically operable hydraulic valve.
Claim 6
Dependent Claim
44 words
The hydraulic brake system as claimed in claim 1 wherein said pressure generator is provided by a master cylinder having a booster chamber and a working chamber, said first chamber provided by said booster chamber and said second chamber provided by said working chamber.
References Cited (Backward Citations)
US4416347A
Cited
US4509802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |