US3659906A
Expired / Lapsed
US
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Wheel lock control system and method having high and low mode selection
Assignee: Motors Liquidation Co
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Filing: 1970-02-18
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Granted: 1972-05-02
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Expires: 1990-02-18
Abstract
Abstract A vehicle wheel lock control system in which the front left and right wheels are provided with separate sensors. The sensors generate signals indicating the changes in wheel velocity during braking and the signals are transmitted to a controller, which, in turn, controls a modulator for the brakes of both front wheels. Due to slight differences in friction coefficient, brake operation, tire and road surfaces, one front wheel will usually have a larger instantaneous wheel slip than the other front wheel and will tend to lock more quickly than the other. Thus, one wheel will have signals generated indicating an incipient wheel lock condition earlier than the other wheel. In normal operation, the front wheel control system will actuate the modulator when both sensors have generated signals indicating the existence of a greater wheel slip than desired for optimum braking, but will not operate when only one wheel causes such a signal to be generated. Under some conditions of vehicle operation, and particularly when leftward or rightward steering is being attempted, the system is modified to cause the modulator to be operated when either of the front wheels causes such a signal to be generated, without also requiring a similar signal from the other wheel. The brake control system for the entire vehicle is also disclosed as including a rear wheel lock control system.
Inventors
- 👤 Robert A Horvath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:46
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/24; B60T8/246; B60T8/18; B60T8/32; B60T8/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
210 words
In a vehicle wheel lock control system having first and second wheel condition signal generating means respectively associated with different wheels to be braked, brake line pressure generating means, brake line pressure modulating means controlling wheel brake pressure delivered to said wheels to be braked, and logic control means controlling said modulating means in accordance with signals from said wheel condition signal generating means, the improvement comprising: third signal generating means responsive to a vehicle condition of operation havIng at least two condition modes, said third signal generating means delivering a first signal to said logic control means in response to one vehicle condition mode and a second signal in response to another vehicle condition mode, said logic control means controlling said modulating means in response to said first signal and limiting modulating action of said modulating means to response to wheel condition signals from both of said first and second wheel condition signal generating means indicating incipient wheel lock, said logic control means controlling said modulating means in response to said second signal and permitting modulating action of said modulating means in response to a wheel condition signal from either of said first and second wheel condition signal generating means indicating incipient wheel lock of one of the wheels.
Claim 2
Dependent Claim
210 words
In a vehicle wheel lock control system having first and second wheel condition signal generating means respectively associated with different wheels to be braked, brake line pressure generating means, brake line pressure modulating means controlling wheel brake pressure delivered to said wheels to be braked, and logic control means controlling said modulating means in accordance with signals from said wheel condition signal generating means, the improvement comprising: third signal generating means responsive to a vehicle condition of operation havIng at least two condition modes, said third signal generating means delivering a first signal to said logic control means in response to one vehicle condition mode and a second signal in response to another vehicle condition mode, said logic control means controlling said modulating means in response to said first signal and limiting modulating action of said modulating means to response to wheel condition signals from both of said first and second wheel condition signal generating means indicating incipient wheel lock, said logic control means controlling said modulating means in response to said second signal and permitting modulating action of said modulating means in response to a wheel condition signal from either of said first and second wheel condition signal generating means indicating incipient wheel lock of one of the wheels.
Claim 3
Dependent Claim
49 words
The mechanism of claim 1, said vehicle condition of operation being steering of said wheels to be braked, said first signal reflecting a vehicle condition mode of straightahead steering and said second signal reflecting a vehicle condition mode of turning said wheels to change the direction of vehicle travel.
Claim 4
Dependent Claim
183 words
A vehicle wheel brake wheel slip control system comprising: first and second vehicle steerable wheels, steering mechanism therefor, wheel brakes for said wheels, means for controlling the application of brake force to said wheel brakes, signal generating means for each of said steerable wheels each generating an excessive wheel slip signal independently of other vehicle wheels when the wheel associated therewith slips excessively during braking, means sensing the operation of said steering mechanism to steer said wheels in either direction relative to a straight line and generating a turning signal, and logic control means receiving said signals and acting to cause said controlling means to decrease brake force applied to said wheel brakes to decrease wheel slip of said wheels below excessive wheel slip and to permit reapplication of brake force to said wheel brakes thereafter, said logic control means so acting only upon receipt of both of said excessive wheel slip signals when said turning signal is not being generated, and so acting upon receipt of the first generated of said excessive wheel slip signals when said turning signal is being generated.
Claim 5
Dependent Claim
183 words
A vehicle wheel brake wheel slip control system comprising: first and second vehicle steerable wheels, steering mechanism therefor, wheel brakes for said wheels, means for controlling the application of brake force to said wheel brakes, signal generating means for each of said steerable wheels each generating an excessive wheel slip signal independently of other vehicle wheels when the wheel associated therewith slips excessively during braking, means sensing the operation of said steering mechanism to steer said wheels in either direction relative to a straight line and generating a turning signal, and logic control means receiving said signals and acting to cause said controlling means to decrease brake force applied to said wheel brakes to decrease wheel slip of said wheels below excessive wheel slip and to permit reapplication of brake force to said wheel brakes thereafter, said logic control means so acting only upon receipt of both of said excessive wheel slip signals when said turning signal is not being generated, and so acting upon receipt of the first generated of said excessive wheel slip signals when said turning signal is being generated.
Claim 6
Dependent Claim
62 words
The control system of claim 3, further comprising: other vehicle wheels which are non-steerable, wheel brakes for said other wheels, and other wheel brake wheel slip control means for said other vehicle wheels, said other control means acting to prevent excessive wheel slip of said other vehicle wheels during wheel braking independently of said signals from said steerable wheels signal generating means.
Claim 7
Independent Claim
165 words
The method of controlling vehicle wheel slip of vehicle wheels capable of exhibiting different concurrent wheel slip characteristics during braking, said method comprising: sensing excessive wheel slip of a first wheel to be controlled by wheel slip control means and generating a first excessive wheel slip signal, sensing excessive wheel slip of a second wheel to be controlled by said wheel slip control means and generating a second excessive wheel slip signal, normally actuating the wheel slip control means only upon the generation of both of the first and second signals, sensing a vehicle condition affected adversely by excessive wheel slip during braking and generating a third signal when the condition occurs, and actuating the wheel slip control means upon the generation of the third signal and either one of the first and second signals to control the wheel slip of the first and second wheels and prevent excessive wheel slip during braking to the extent that the sensed vehicle condition is not adversely affected.
Claim 8
Independent Claim
165 words
The method of controlling vehicle wheel slip of vehicle wheels capable of exhibiting different concurrent wheel slip characteristics during braking, said method comprising: sensing excessive wheel slip of a first wheel to be controlled by wheel slip control means and generating a first excessive wheel slip signal, sensing excessive wheel slip of a second wheel to be controlled by said wheel slip control means and generating a second excessive wheel slip signal, normally actuating the wheel slip control means only upon the generation of both of the first and second signals, sensing a vehicle condition affected adversely by excessive wheel slip during braking and generating a third signal when the condition occurs, and actuating the wheel slip control means upon the generation of the third signal and either one of the first and second signals to control the wheel slip of the first and second wheels and prevent excessive wheel slip during braking to the extent that the sensed vehicle condition is not adversely affected.
Claim 9
Dependent Claim
40 words
The method of claim 5, wherein the sensed vehicle condition is steering of the first and second wheels to turn the vehicle, and the third signal signifies movement of vehicle steering mEchanism either leftward or rightward from a straight-ahead position.
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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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |