US3620577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake control system
Assignee: Boeing North American Inc
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Filing: 1969-12-09
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Granted: 1971-11-16
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Expires: 1989-12-09
Abstract
Abstract An electronic antiskid vehicle brake control system in which a pulse signal indicating the speed of one or more rear vehicle wheels is constantly compared to a reference pulse signal indicating the speed of the front vehicle wheels and a control signal is generated upon detection of a predetermined velocity differential. The control signal modulates the braking effort at the rear wheels. The front wheel brakes are released if they lock during brake application to permit the front wheels to regain speed to reestablish the reference signal and preserve steerability of the vehicle. When applied to a tractor-trailer combination the control system is automatically made compatible with a variety of trailer brake configurations.
Inventors
- 👤 James C Neisch
- 👤 Alton B Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:19
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/1701; B60T8/1708; B60T8/32; B60T8/321; B60T8/323; B60T8/34; B60T8/58; Y; Y10; Y10S; Y10S188/00; Y10S188/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
214 words
An antiskid vehicle brake control system for a vehicle having at least a pair of wheels each equipped with a pneumatically actuated brake, said system comprising a source of air under superatmospheric pressure, an operator controlled valve having an inlet connected to said source and an outlet, normally open solenoid-operated valve means having an inlet connected to the outlet of said operator controlled valve and an outlet, relay valve means having a first inlet in fluid pressure communication with the outlet of said solenoid-operated valve means and the second inlet connected to said pressure source, said relay valve means having an outlet, a conduit connected between said pneumatically actuated brake and said relay valve means outlet, means for sensing the angular velocity of at least one of said wheels and providing a signal the frequency of which is indicative of instantaneous wheel velocity, and control means connected to receive and process said signal from said wheel speed sensing means, said control means being connected to said solenoid-operated valve means and operative upon receipt of a signal from said sensing means indicative of a tendency of the wheels to lock to actuate said solenoid-operated valve and modify the fluid pressure communication between said operator controlled valve and said first inlet to said relay valve means.
Claim 2
Dependent Claim
214 words
An antiskid vehicle brake control system for a vehicle having at least a pair of wheels each equipped with a pneumatically actuated brake, said system comprising a source of air under superatmospheric pressure, an operator controlled valve having an inlet connected to said source and an outlet, normally open solenoid-operated valve means having an inlet connected to the outlet of said operator controlled valve and an outlet, relay valve means having a first inlet in fluid pressure communication with the outlet of said solenoid-operated valve means and the second inlet connected to said pressure source, said relay valve means having an outlet, a conduit connected between said pneumatically actuated brake and said relay valve means outlet, means for sensing the angular velocity of at least one of said wheels and providing a signal the frequency of which is indicative of instantaneous wheel velocity, and control means connected to receive and process said signal from said wheel speed sensing means, said control means being connected to said solenoid-operated valve means and operative upon receipt of a signal from said sensing means indicative of a tendency of the wheels to lock to actuate said solenoid-operated valve and modify the fluid pressure communication between said operator controlled valve and said first inlet to said relay valve means.
Claim 3
Dependent Claim
78 words
The control system defined in claim 1, wherein said control means comprises means providing a wheel velocity indicative reference signal, means for comparing the first wheel velocity indicative signal with the wheel velocity reference signal and for producing an output signal when said first wheel velocity indicative signal is less than said velocity reference signal by a predetermined amount indicative of a tendency of said one wheel to lock, said output being effective to actuate said solenoid valve.
Claim 4
Dependent Claim
127 words
The system defined in claim 2 wherein said velocity reference signal providing means includes means for sensing the angular velocity of a vehicle wheel and providing a second signal the frequency of which is indicative of the instantaneous velocity of such wheel and wherein said comparing means comprises means for registering the number of cycles of the reference signal in a time interval of fixed duration, means for registering the number of cycles of the first velocity indicative signal in a time interval of like duration and wherein said output signal is produced when a comparison between the registering means indicates that the number of cycles of the first velocity indicative signal is less than the number of cycles of the reference signal by a predetermined number.
Claim 5
Dependent Claim
18 words
The system defined in claim 3 wherein the time intervals for which the comparison is made occur simultaneously.
Claim 6
Dependent Claim
26 words
The system defined in claim 3 wherein the first and second wheel indicative signals are produced from and are indicative of the velocities of different wheels.
References Cited (Backward Citations)
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |