US3632176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle wheel slip control system and road grade sensor therefor and method of controlling wheel slip
Assignee: Motors Liquidation Co
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Filing: 1969-12-09
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Granted: 1972-01-04
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Expires: 1989-12-09
Abstract
Abstract A vehicle wheel brake system in which vehicle and wheel speed signals are generated and utilized to generate a wheel brake pressure command signal, with a road grade sensor generating a signal reflecting the grade of the road on which the vehicle is moving. The road grade signal is used to further refine the command signal by taking into account the road grade. The system also senses brake torque and refines the command signal by considering the effect of changes in brake torque. The command signal controls mechanism, which, in turn, controls the wheel brake apply pressures.
Inventors
- 👤 Edward G Gaeke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:32
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/24; B60T8/245; B60T8/32; B60T8/34; B60T8/58; B60T8/72; B60T8/74; Y; Y10; Y10S; Y10S188/00; Y10S188/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
In combination in a vehicle wheel slip control system for controlling the brakes of one or more vehicle wheels, the combination of: means sensing wheel speed of the wheel brake to be controlled and generating a wheel speed signal, means selectively driven in accordance with wheel speed simulating speed of the vehicle being braked approximating actual vehicle speed during braking and generating a simulated vehicle speed signal, means sensing the road grade of the road on which the vehicle is moving and generating a road grade signal, signal modifying and comparing and generating means receiving said road grade signal and modifying at least one of said speed signals in accordance with said road grade signal and comparing said speed signals as modified and generating therefrom a wheel brake pressure command signal, and means including a wheel brake pressure modulator receiving said command signal and controlling wheel brake pressure in response to said command signal to control wheel slip.
Claim 2
Dependent Claim
158 words
In combination in a vehicle wheel slip control system for controlling the brakes of one or more vehicle wheels, the combination of: means sensing wheel speed of the wheel brake to be controlled and generating a wheel speed signal, means selectively driven in accordance with wheel speed simulating speed of the vehicle being braked approximating actual vehicle speed during braking and generating a simulated vehicle speed signal, means sensing the road grade of the road on which the vehicle is moving and generating a road grade signal, signal modifying and comparing and generating means receiving said road grade signal and modifying at least one of said speed signals in accordance with said road grade signal and comparing said speed signals as modified and generating therefrom a wheel brake pressure command signal, and means including a wheel brake pressure modulator receiving said command signal and controlling wheel brake pressure in response to said command signal to control wheel slip.
Claim 3
Dependent Claim
56 words
The combination set forth in claim 1 further comprising: means sensing the brake torque generated by the wheel brake being controlled and generating a wheel brake torque signal, said signal modifying and comparing and generating means also receiving said torque signal and modifying at least one of said speed signals in accordance with said torque signal.
Claim 4
Dependent Claim
55 words
The combination set forth in claim 1 further comprising: means sensing the brake torque generated by the wheel brake being controlled and generating a wheel brake torque signal, and means receiving said brake torque signal and modifying said wheel brake pressure command signal in accordance with wheel-to-road slip as a function of sensed brake torque.
Claim 5
Dependent Claim
27 words
In the combination set forth in claim 1, said means driven in accordance with wheel speed being connected in driven relation with said wheel speed sensing means.
Claim 6
Dependent Claim
20 words
In the combination set forth in claim 1, said simulated vehicle speed signal being modified by said road grade signal.
Claim 7
Dependent Claim
84 words
In the combination set forth in claim 1, said speed and command signals being forces with said command signal being the summation of said compared speed signals and acting linearly in either of two opposite directions and including the force node as a center, switch-actuating means responsive to said command signal, and switches actuated by said switch-actuating means for controlling the opening and closing of valves of said modulator to apply and release wheel brake pressure to the extent required to control wheel slip.
Claim 8
Independent Claim
133 words
The method of controlling vehicle wheel slip comprising the steps of: a. sensing a wheel rotational characteristic and generating a wheel movement characteristic signal, b. simulating a vehicle linear moving characteristic and generating a simulated vehicle movement characteristic signal, c. sensing the road grade on which the vehicle is moving and generating a road grade signal, d. modifying one of said characteristic signals by the road grade signal, e. combining the modified movement characteristic signal and the other movement characteristic signal and generating a wheel brake apply pressure command signal, f. and selectively changing wheel brake apply pressure in accordance with the command signal to selectively apply wheel brake pressure to a wheel brake for the sensed wheel and to release wheel brake pressure applied to the wheel brake for the sensed wheel.
Claim 9
Independent Claim
133 words
The method of controlling vehicle wheel slip comprising the steps of: a. sensing a wheel rotational characteristic and generating a wheel movement characteristic signal, b. simulating a vehicle linear moving characteristic and generating a simulated vehicle movement characteristic signal, c. sensing the road grade on which the vehicle is moving and generating a road grade signal, d. modifying one of said characteristic signals by the road grade signal, e. combining the modified movement characteristic signal and the other movement characteristic signal and generating a wheel brake apply pressure command signal, f. and selectively changing wheel brake apply pressure in accordance with the command signal to selectively apply wheel brake pressure to a wheel brake for the sensed wheel and to release wheel brake pressure applied to the wheel brake for the sensed wheel.
Claim 10
Dependent Claim
45 words
The method of claim 7 in which in step (b) the simulated vehicle movement characteristic signal is generated with a wheel brake torque signal as a component thereof, and in step (d) the simulated vehicle Movement characteristic signal is modified by the road grade signal.
Claim 11
Dependent Claim
56 words
The method of claim 7, in which in step (f) includes selectively changing wheel brake apply pressure from a full apply to another condition which may be a slow apply or a pressure release as required by the command signal to control wheel slip, and reapplying wheel brake apply pressure as permitted by the command signal.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |