US3832011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-slip or adaptive braking system
Assignee: DBA SA
•
Filing: 1973-01-05
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Granted: 1974-08-27
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Expires: 1993-01-05
Abstract
Abstract An adaptive braking system for a set of vehicle wheels, of the type comprising a fluid pressure source, braking apparatus associated with the set of wheels, and control apparatus for controlling the fluid pressure acting on the braking apparatus. The fluid pressure supplied to the braking apparatus is automatically controlled by the control apparatus in successive stages of pressure increase and pressure decrease separated from one another by intervals during which the pressure is kept constant. More particulary, a stage of pressure increase is controlled after an interval whenever the deceleration of a wheel has been decreasing or has remained constant during this interval, and a stage of pressure decrease whenever the deceleration has been increasing during the interval.
Inventors
- 👤 G Marouby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:54
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1763; B60T8/17633
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
304 words
An adaptive braking system for a set of vehicle wheels, of the type comprising a pressure fluid source, braking means associated with the set of wheels, and means for controlling the fluid pressure acting on the brake actuating means and supplied by the source following intervention by an operator, the system being characterized in that the control means exert the braking pressure automatically in successive stages of increase or decrease separated from one another by intervals during which the braking pressure is kept constant; said control means comprising time-base forming means delivering a train of time-base signals of unit duration equal to the first predetermined duration, separated from one another by the intervals; detection means responsive to the increase and decrease in deceleration of the wheel and generating a detection signal when the deceleration is increasing; comparison means operated by the time-base signals and by the detection signal and generating a comparison signal if the detection signal is still being generated after a third predetermined duration, said third predetermined duration being shorter than the second predetermined duration, and beginning at the trailing edge of each time-base signal, said comparison signal terminating when the detection signal ends; admission means operated by the time-base signals and by the comparison signal, these means connecting the pressure fluid source to the brake actuating means for the duration of the time-base signals while the comparison signal is absent, and disconnecting the source from the brake actuating means during the intervals and while the comparison signal is present; pressure-release initiating means operated by the time-base signals and by the comparison signal and delivering pressure-release signal when the time-base signals and comparison signal are present simultaneously; and release means operated by the release signal and permitting, for the duration of this signal, release of the fluid acting on the braking means.
Claim 2
Dependent Claim
304 words
An adaptive braking system for a set of vehicle wheels, of the type comprising a pressure fluid source, braking means associated with the set of wheels, and means for controlling the fluid pressure acting on the brake actuating means and supplied by the source following intervention by an operator, the system being characterized in that the control means exert the braking pressure automatically in successive stages of increase or decrease separated from one another by intervals during which the braking pressure is kept constant; said control means comprising time-base forming means delivering a train of time-base signals of unit duration equal to the first predetermined duration, separated from one another by the intervals; detection means responsive to the increase and decrease in deceleration of the wheel and generating a detection signal when the deceleration is increasing; comparison means operated by the time-base signals and by the detection signal and generating a comparison signal if the detection signal is still being generated after a third predetermined duration, said third predetermined duration being shorter than the second predetermined duration, and beginning at the trailing edge of each time-base signal, said comparison signal terminating when the detection signal ends; admission means operated by the time-base signals and by the comparison signal, these means connecting the pressure fluid source to the brake actuating means for the duration of the time-base signals while the comparison signal is absent, and disconnecting the source from the brake actuating means during the intervals and while the comparison signal is present; pressure-release initiating means operated by the time-base signals and by the comparison signal and delivering pressure-release signal when the time-base signals and comparison signal are present simultaneously; and release means operated by the release signal and permitting, for the duration of this signal, release of the fluid acting on the braking means.
Claim 3
Dependent Claim
40 words
A system as claimed in claim 1, characterized in that the admission means comprise a first, normally open solenoid valve which is energized into a closed position for the duration of the intervals and when the comparison signal is present.
Claim 4
Dependent Claim
112 words
A system as claimed in any of claim 1, characterized in that the detection means responsive to the increase and decrease in the deceleration comprise a speed sensor generating a signal whose frequency is proportional to the speed of the wheel, a converter circuit generating a speed signal whose value is proportional to the frequency, a differentiator circuit supplying a differentiated signal whose amplitude is proportional to the derivative with respect to time of the value of the speed signal, and a circuit responsive to the direction of variation of the negative portion of the amplitude of the differentiated signal and supplying the detection signal when the said negative portion is increasing.
Claim 5
Dependent Claim
106 words
A system as claimed in any of claim 1, characterized in that the comparison means comprise timing means operated by each time-base signal and supplying a train of modified time-base signals of which the leading edge is synchronous with the leading edge of the respective time-base signal but the trailing edge is delayed relative to the trailing edge of the respective time-base signal by the third predetermined duration, and bistable inhibition means operated by the modified time-base signals and by the detection signal and supplying the comparison signal for the duration of the detection signal except before the trailing edge of the current modified time-base signal.
Claim 6
Dependent Claim
37 words
A system as claimed in any of claim 1, characterized in that the third predetermined duration is at least equal to the sum of the response times of the admission means, brake actuating means and detection means.
Claim 7
Dependent Claim
31 words
A system as claimed in any of claim 1, characterized in that the release means comprise a second normally closed solenoid valve energized into an open position by the release signal.
Claim 8
Dependent Claim
146 words
In a vehicle having a wheel and brake means controlling said wheel, and adaptive braking system comprising: means for generating a first signal proportional to deceleration of said wheel; means responsive to said first signal for generating a second signal only when wheel deceleration increases and terminating said second signal when wheel deceleration does not increase; means for generating pulsating signals consisting of discrete pulses having a predetermined duration; means responsive to said second signal and to said pulsating signal for initiating generation of a third signal when said second signal and one of said discrete pulses are generated concurrently and terminating generation of said third signal only upon termination of said second signal; release valve means for controlling release of said brake means; and valve control means responsive to simultaneous generation of said pulsating signals and said third signal to actuate said release valve means.
Claim 9
Dependent Claim
146 words
In a vehicle having a wheel and brake means controlling said wheel, and adaptive braking system comprising: means for generating a first signal proportional to deceleration of said wheel; means responsive to said first signal for generating a second signal only when wheel deceleration increases and terminating said second signal when wheel deceleration does not increase; means for generating pulsating signals consisting of discrete pulses having a predetermined duration; means responsive to said second signal and to said pulsating signal for initiating generation of a third signal when said second signal and one of said discrete pulses are generated concurrently and terminating generation of said third signal only upon termination of said second signal; release valve means for controlling release of said brake means; and valve control means responsive to simultaneous generation of said pulsating signals and said third signal to actuate said release valve means.
Claim 10
Dependent Claim
64 words
The invention of claim 7; said pulsating signal generating means including timer means connected to the means generating said third signal, said timer means including means for modifying the duration of the pulses transmitted to the means generating said third signal so that the pulses transmitted to the latter are of a longer duration than are the pulses transmitted to said valve control means.
References Cited (Backward Citations)
US3499689A
Cited
US3519313A
Cited
US3637264A
Cited
US3698772A
Cited
US3674320A
Cited
US3704043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |