US3768872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skid control system
Assignee: Eaton Corp
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Filing: 1971-03-17
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Granted: 1973-10-30
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Expires: 1991-03-17
Abstract
Abstract A compound anti-skid logic system in which a plurality of different logic circuits are operative in parallel to process input signals from a common source in accordance with the different logic of each circuit with the different circuits complementing each other so that at least one logic circuit detects a wheel lock or an impending wheel lock under widely variable road conditions and brake application pressures. The compound system is incorporated in a master module with additional slave modules used with the master module to control axles in addition to the axle controlled by the master module.
Inventors
- 👤 J Urban
- 👤 Ninch J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:55
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/1701; B60T8/1708; B60T8/32; B60T8/58
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
253 words
A brake control system for a vehicle having a plurality of brake equipped independently rotatable wheels and including at least a pair of wheels mounted in spaced relation for rotation about a common axis, said system comprising means for applying brake forces to actuate said brakes and for relieving said brake forces at both of said wheels on said common axis in response to a skid signal, signal generating means associated with each of said wheels to generate signals representative of the speed of each wheel, first logic means operative to generate a skid signal when a wheel speed signal from said pair of wheels differs by a predetermined amount from the wheel speed signal of the fastest rotating wheel, second logic means operative to generate a skid signal when the deceleration of a wheel on said common axis exceeds a predetermined deceleration, means for generating a computed reference speed signal which decreases in magnitude as the speed of the faster wheel decreases for an initial value representative of the speed of the faster wheel and at a decay rate representative of a predetermined deceleration, third logic means operative to generate a skid signal when a wheel speed signal from said pair of wheels decreases below said computed reference speed signal, and circuit means interconnecting each of said logic means whereby a skid signal generated by any of said logic means is operative to actuate said brake relieving means to relieve the brake forces at both of said wheels on said common axis.
Claim 2
Dependent Claim
253 words
A brake control system for a vehicle having a plurality of brake equipped independently rotatable wheels and including at least a pair of wheels mounted in spaced relation for rotation about a common axis, said system comprising means for applying brake forces to actuate said brakes and for relieving said brake forces at both of said wheels on said common axis in response to a skid signal, signal generating means associated with each of said wheels to generate signals representative of the speed of each wheel, first logic means operative to generate a skid signal when a wheel speed signal from said pair of wheels differs by a predetermined amount from the wheel speed signal of the fastest rotating wheel, second logic means operative to generate a skid signal when the deceleration of a wheel on said common axis exceeds a predetermined deceleration, means for generating a computed reference speed signal which decreases in magnitude as the speed of the faster wheel decreases for an initial value representative of the speed of the faster wheel and at a decay rate representative of a predetermined deceleration, third logic means operative to generate a skid signal when a wheel speed signal from said pair of wheels decreases below said computed reference speed signal, and circuit means interconnecting each of said logic means whereby a skid signal generated by any of said logic means is operative to actuate said brake relieving means to relieve the brake forces at both of said wheels on said common axis.
Claim 3
Dependent Claim
106 words
The system of claim 1 wherein said first and third logic means comprise circuit means for receivIng said fastest wheel speed signal and producing a first output signal that is proportional to said fastest rotating wheel speed signal when said fastest wheel speed is decreasing at a rate equal to or less than a predetermined rate and a second output signal representative of a computed speed signal when said fastest wheel speed is decreasing at a rate in excess of a predetermined rate; said circuit means further including comparator means for comparing said first output signal with a wheel speed signal from said pair of wheels.
Claim 4
Dependent Claim
29 words
The system of claim 2 wherein said comparator means is operative to compare the wheel speed signal from either of said pair of wheels with said first output signal.
Claim 5
Dependent Claim
202 words
A skid control system for a vehicle having a pair of brake equipped independently rotatable wheels mounted in spaced relation for rotation about a common axis, said system comprising, generating means for producing signals representative of the wheel speed of each of said wheels, vehicle operator controlled means for applying forces to the brakes, means operative to relieve the application of forces to said brakes associated with both of said wheels in response to a skid signal, logic system means for detecting a skid condition at least at one of the wheels and generating a skid signal, said system including circuit means for receiving the wheels speed signal from the fastest rotating wheel and producing a first output signal proportional to said fastest rotating wheel speed signal and further including means for producing a second output signal representative of a computed speed signal when said fastest rotating wheel speed signal is decreasing at a rate in excess of a predetermined rate, said system further including comparator means for comparing said first output signal with a speed signal from said wheels and being operative to generate a skid signal when said speed signal from said wheels is less than said first output signal.
Claim 6
Dependent Claim
202 words
A skid control system for a vehicle having a pair of brake equipped independently rotatable wheels mounted in spaced relation for rotation about a common axis, said system comprising, generating means for producing signals representative of the wheel speed of each of said wheels, vehicle operator controlled means for applying forces to the brakes, means operative to relieve the application of forces to said brakes associated with both of said wheels in response to a skid signal, logic system means for detecting a skid condition at least at one of the wheels and generating a skid signal, said system including circuit means for receiving the wheels speed signal from the fastest rotating wheel and producing a first output signal proportional to said fastest rotating wheel speed signal and further including means for producing a second output signal representative of a computed speed signal when said fastest rotating wheel speed signal is decreasing at a rate in excess of a predetermined rate, said system further including comparator means for comparing said first output signal with a speed signal from said wheels and being operative to generate a skid signal when said speed signal from said wheels is less than said first output signal.
Claim 7
Dependent Claim
29 words
The system of claim 4 wherein said comparator means is operative to compare the wheel speed signal from either of said pair of wheels with said first output signal.
Claim 8
Dependent Claim
32 words
The system of claim 4 wherein said logic system further includes means operative to generate a skid signal when the deceleration of a wheel on said common axis exceeds a predetermined deceleration.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |