US3832013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-skid control system for fluid pressure brakes
Assignee: Bendix Corp
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Filing: 1973-03-08
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Granted: 1974-08-27
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Expires: 1993-03-08
Abstract
Abstract An anti-skid fluid pressure brake control system particularly designed for use under conditions of exceptionally low tire to road co-efficient of friction on the order of wet ice, apparatus being provided to relieve braking pressure upon the simultaneous occurence of low wheel speed just short of lock up and a predetermined deceleration rate and thereafter continuing pressure relief for a prolonged period of time preferably determined by the length of time it takes the wheel to reach a maximum rate of acceleration whereupon relief is terminated and pressure build up restored. Apparatus are provided for shifting to a regular adaptive mode of brake control should the vehicle encounter less severe road conditions during the brake application.
Inventors
- 👤 D Davis
- 👤 J Juhasz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:19
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/58; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633; Y; Y10; Y10S; Y10S303/00; Y10S303/05
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
238 words
In a fluid pressure brake system, anti-skid means for controlling brake application in the event of wheel skid comprising means for generating a first signal in response to a linear wheel speed of a predetermined value, means for generating a second signal in response to deceleration of said wheel to a predetermined value, means for generating a third signal in response to the simultaneous generation of said first and second signals, and means effecting a reduction of fluid pressure in the brake system in response ro said third signal, means for producing a fourth signal at the termination of a period of time, means responsive to said fourth signal for effecting restoration of fluid pressure in said system, and means responsive to said third signal for initiating said period of time, means for generating a fifth signal in response to deceleration of said wheel to a predetermined value greater than said first mentioned predetermined deceleration value, means for operating said pressure reduction means in response to said fifth signal, means for generating a sixth signal in response to acceleration of said wheel to a predetermined value during the reduction of pressure in said system, means for effecting restoration of fluid pressure in response to said sixth signal, and means responsive to the presence of said third signal for preventing said sixth signal from effecting restoration of fluid pressure in said system at said predetermined value of wheel acceleration.
Claim 2
Dependent Claim
238 words
In a fluid pressure brake system, anti-skid means for controlling brake application in the event of wheel skid comprising means for generating a first signal in response to a linear wheel speed of a predetermined value, means for generating a second signal in response to deceleration of said wheel to a predetermined value, means for generating a third signal in response to the simultaneous generation of said first and second signals, and means effecting a reduction of fluid pressure in the brake system in response ro said third signal, means for producing a fourth signal at the termination of a period of time, means responsive to said fourth signal for effecting restoration of fluid pressure in said system, and means responsive to said third signal for initiating said period of time, means for generating a fifth signal in response to deceleration of said wheel to a predetermined value greater than said first mentioned predetermined deceleration value, means for operating said pressure reduction means in response to said fifth signal, means for generating a sixth signal in response to acceleration of said wheel to a predetermined value during the reduction of pressure in said system, means for effecting restoration of fluid pressure in response to said sixth signal, and means responsive to the presence of said third signal for preventing said sixth signal from effecting restoration of fluid pressure in said system at said predetermined value of wheel acceleration.
Claim 3
Dependent Claim
34 words
In the system of claim 1 including means responsive to maximum wheel acceleration following reduction of pressure in said system for enaBling said sixth signal to effect restoration of fluid pressure in said system.
Claim 4
Dependent Claim
92 words
In the system of claim 2 timer means operable to produce a seventh signal, means responsive to the generation of said fifth signal for preventing said timer means from producing a seventh signal for a predetermined period of time following the generation of said fifth signal, and means responsive to said seventh signal produced by said timer means in the absence of the generation of a fifth signal within said predetermined period of time for preventing said fifth and sixth signals from effecting operation of said pressure reduction and restoration means, respectively.
Claim 5
Dependent Claim
44 words
In the system of claim 3 including means responsive to the generation of said third signal for disabling said timer means, and means responsive to maximum wheel acceleration for reenabling said timer means following reduction of braking pressure in response to said third signal.
Claim 6
Dependent Claim
38 words
In the system of claim 3 including a disable memory responsive to said seventh signal for permenently preventing said third and fifth signals and said sixth signal from effecting operation of said pressure reduction and restoration means, respectively.
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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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |