US3870378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive braking system control wheel selection by coefficient comparison
Assignee: Bendix Corp
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Filing: 1973-08-27
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Granted: 1975-03-11
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Expires: 1993-08-27
Abstract
Abstract An adaptive braking system in which the speed of each wheel on an axle is independently sensed but the braking pressure of both axle wheels is controlled during adaptive braking by a single brake pressure modulator. The speed of each wheel is sensed by an individual wheel speed sensor which in turn feeds an individual control logic circuit for its respective wheel. A control logic circuit normally generates signals for attenuating and subsequently restoring brake pressure on the wheel whose wheel speed sensor is feeding it. In the present invention, the control logic circuits are connected to a brake pressure modulator through a gating circuit so that brake pressure on both wheels is attenuated only if both control logic circuits generate signals to attenuate brake pressure and brake pressure is subsequently restored only if both control logic circuits require that brake pressure be restored. The gating circuit also permits the wheel having the highest speed to control adaptive braking in case the ratio of the speed of the low speed wheel with respect to the speed of the high speed wheel drops below a predetermined level.
Inventors
- 👤 Ralph W Carp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:21
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1764
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
271 words
In a wheeled vehicle braked by braking force, an adaptive braking system having means for attenuating braking force in response to a first signal and for subsequently restoring braking force in response to a second signal comprising: first means for generating a signal related to the speed of a first vehicle wheel; second means for generating a signal related to the speed of a second vehicle wheel; control logic means for generating a first group of third and fourth signals in response to the signal generated by said first means and for generating a second group of third and fourth signals in response to the signal generated by said second means; means responsive to the simultaneous generation of third signals of said first and second groups of signals for generating said first signal and subsequently responsive to the simultaneous generation of said fourth signals of said first and second group of signals for generating said second signal; comparator means for generating a comparator output signal when the speed of one of said first and second vehicle wheels is without a predetermined relationship with the speed of the other of said first and second vehicle wheels; and, means responsive to said comparator output signal for applying only the group of third and fourth signals, of said first and second group, generated in response to the signal related to the speed of the faster rotating of said first and second vehicle wheels, to said means for attenuating braking force, the group of third and fourth signals so applied to said means for attenuating braking force thereby comprising said first and second signals respectively.
Claim 2
Dependent Claim
271 words
In a wheeled vehicle braked by braking force, an adaptive braking system having means for attenuating braking force in response to a first signal and for subsequently restoring braking force in response to a second signal comprising: first means for generating a signal related to the speed of a first vehicle wheel; second means for generating a signal related to the speed of a second vehicle wheel; control logic means for generating a first group of third and fourth signals in response to the signal generated by said first means and for generating a second group of third and fourth signals in response to the signal generated by said second means; means responsive to the simultaneous generation of third signals of said first and second groups of signals for generating said first signal and subsequently responsive to the simultaneous generation of said fourth signals of said first and second group of signals for generating said second signal; comparator means for generating a comparator output signal when the speed of one of said first and second vehicle wheels is without a predetermined relationship with the speed of the other of said first and second vehicle wheels; and, means responsive to said comparator output signal for applying only the group of third and fourth signals, of said first and second group, generated in response to the signal related to the speed of the faster rotating of said first and second vehicle wheels, to said means for attenuating braking force, the group of third and fourth signals so applied to said means for attenuating braking force thereby comprising said first and second signals respectively.
Claim 3
Dependent Claim
271 words
In a wheeled vehicle braked by braking force, an adaptive braking system having means for attenuating braking force in response to a first signal and for subsequently restoring braking force in response to a second signal comprising: first means for generating a signal related to the speed of a first vehicle wheel; second means for generating a signal related to the speed of a second vehicle wheel; control logic means for generating a first group of third and fourth signals in response to the signal generated by said first means and for generating a second group of third and fourth signals in response to the signal generated by said second means; means responsive to the simultaneous generation of third signals of said first and second groups of signals for generating said first signal and subsequently responsive to the simultaneous generation of said fourth signals of said first and second group of signals for generating said second signal; comparator means for generating a comparator output signal when the speed of one of said first and second vehicle wheels is without a predetermined relationship with the speed of the other of said first and second vehicle wheels; and, means responsive to said comparator output signal for applying only the group of third and fourth signals, of said first and second group, generated in response to the signal related to the speed of the faster rotating of said first and second vehicle wheels, to said means for attenuating braking force, the group of third and fourth signals so applied to said means for attenuating braking force thereby comprising said first and second signals respectively.
Claim 4
Dependent Claim
271 words
In a wheeled vehicle braked by braking force, an adaptive braking system having means for attenuating braking force in response to a first signal and for subsequently restoring braking force in response to a second signal comprising: first means for generating a signal related to the speed of a first vehicle wheel; second means for generating a signal related to the speed of a second vehicle wheel; control logic means for generating a first group of third and fourth signals in response to the signal generated by said first means and for generating a second group of third and fourth signals in response to the signal generated by said second means; means responsive to the simultaneous generation of third signals of said first and second groups of signals for generating said first signal and subsequently responsive to the simultaneous generation of said fourth signals of said first and second group of signals for generating said second signal; comparator means for generating a comparator output signal when the speed of one of said first and second vehicle wheels is without a predetermined relationship with the speed of the other of said first and second vehicle wheels; and, means responsive to said comparator output signal for applying only the group of third and fourth signals, of said first and second group, generated in response to the signal related to the speed of the faster rotating of said first and second vehicle wheels, to said means for attenuating braking force, the group of third and fourth signals so applied to said means for attenuating braking force thereby comprising said first and second signals respectively.
Claim 5
Dependent Claim
20 words
The adaptive braking system of claim 1 wherein said first and second vehicle wheels are on the same vehicle axle.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |