US3918766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Individual wheel anti-skid brake control system having means to prevent excessive brake pressure differences
Assignee: Wabco Westinghouse GmbH Germany
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Filing: 1974-02-04
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Granted: 1975-11-11
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Expires: 1994-02-04
Abstract
Abstract Electronic brake control circuitry for modulating vehicle brake pressure on an individual wheel basis is provided with apparatus for invoking a holding phase during the build-up of brake pressure on a non-skidding wheel when the brake pressure at the opposite wheel of an automotive vehicle is exhausted due to a wheel skid being detected at the latter wheel, thereby preventing a large difference from arising between the individual wheel brake pressures to avoid severe vehicle instability. In the event both wheels skid, the influence of one wheel upon the other is terminated and each wheel brake pressure is controlled individually according to the skid condition of that particular wheel.
Inventors
- 👤 Alfred Klatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:17
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1764; Y; Y10; Y10S; Y10S303/00; Y10S303/09
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
281 words
A fluid pressure actuated anti-skid brake control system for a vehicle having a pair of brake equipped, independently rotatable wheels on opposite ends of an axle, said system comprising: a. signal generator means for each of said wheels for providing a deceleration signal indicative of a skid condition of the respective wheels; b. valve means for each of said wheels for effecting independent control of fluid brake pressure at the respective wheels; c. logic means for each of said wheels responsive to said deceleration signal thereof for providing a first output signal in response to which said valve means of a skidding one of said wheels is operated to terminate the supply of fluid brake pressure thereto and to concurrently release fluid brake pressure therefrom, said logic means of the respective wheels being interconnected such that said first output signal is connected to said valve means of the other one of said wheels for terminating the supply of fluid brake pressure thereto in the absence of a wheel skid thereof, whereby the brake pressure of the non-skidding other one of said wheels remains substantially constant when brake pressure is being released at the skidding one of said wheels, each of said logic means comprising: i. first AND gate means via which said first output signal is connected to said valve means of the other one of said wheels and; ii. first timer means responsive to said deceleration signal for establishing a wheel skid correction period during which said first AND gate of said logic means of the other of said wheels is disabled to prevent said logic means of a nonskidding wheel from influencing the brake pressure of a skidding wheel.
Claim 2
Dependent Claim
281 words
A fluid pressure actuated anti-skid brake control system for a vehicle having a pair of brake equipped, independently rotatable wheels on opposite ends of an axle, said system comprising: a. signal generator means for each of said wheels for providing a deceleration signal indicative of a skid condition of the respective wheels; b. valve means for each of said wheels for effecting independent control of fluid brake pressure at the respective wheels; c. logic means for each of said wheels responsive to said deceleration signal thereof for providing a first output signal in response to which said valve means of a skidding one of said wheels is operated to terminate the supply of fluid brake pressure thereto and to concurrently release fluid brake pressure therefrom, said logic means of the respective wheels being interconnected such that said first output signal is connected to said valve means of the other one of said wheels for terminating the supply of fluid brake pressure thereto in the absence of a wheel skid thereof, whereby the brake pressure of the non-skidding other one of said wheels remains substantially constant when brake pressure is being released at the skidding one of said wheels, each of said logic means comprising: i. first AND gate means via which said first output signal is connected to said valve means of the other one of said wheels and; ii. first timer means responsive to said deceleration signal for establishing a wheel skid correction period during which said first AND gate of said logic means of the other of said wheels is disabled to prevent said logic means of a nonskidding wheel from influencing the brake pressure of a skidding wheel.
Claim 3
Dependent Claim
150 words
The system recited in claim 1 wherein said logic means further comprises: a. second AND gate means via which said first timer means acts to provide said first output signal during said correction period; b. third AND gatE means subject to said wheel behavior signals and a signal indicating the presence of said correction period for providing a second output signal to disable said second AND gate when resumption of normal rotation of said skidding wheel is obtained; c. second timer means initiated by said second output signal of said third AND gate; and d. OR gate means via which said second timer means acts in parallel with said first output signal to actuate said valve means associated with said logic means of said non-skidding wheel to interrupt the supply of brake pressure thereto for a predetermined duration within said correction period in the absence of said first output signal.
Claim 4
Dependent Claim
64 words
The system recited in claim 2 wherein said logic means further comprises: a. third timer means initiated for a predetermined duration in response to expiration of said second timer means; and b. pulse generator means actuated in response to initiation of said third timer means for providing said first output signal intermittently to provide a stepped reapplication of brake pressure via said valve means.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |