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Patent US3825305A successfully refreshed from Google Patents.
US3825305A
Expired / Lapsed
US
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Adaptive braking system
Assignee: Bendix Corp
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Filing: 1972-06-16
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Granted: 1974-07-23
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Expires: 1992-06-16
Abstract
Abstract An adaptive braking system for an automotive vehicle is disclosed which includes a speed reacquisition feature which precludes termination of a brake pressure decay cycle until the controlled wheel attains a predetermined percentage of the angular velocity at which the wheel was rotating at the time that the decay cycle was initiated. The adaptive braking system includes the usual comparator which compares wheel acceleration to a predetermined reference level and generates a signal initiating a decay cycle when the wheel decelerates in excess of the reference level. The output signal of the comparator also enables a speed memory circuit which memorizes a predetermined percentage of the wheel speed. A comparator compares the instantaneous wheel speed during the decay cycle with the memorized value, and generates a signal which may maintain the decay cycle even though the wheel reaccelerates past an acceleration reference level which would normally terminate the decay cycle.
Inventors
- 👤 J Kasselmann
- 👤 G Hickner
- 👤 D Howard
- 👤 J Needham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:44
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
318 words
In a wheeled vehicle having a brake for braking a corresponding wheel, an adaptive braking system for controlling said brake to prevent skidding of said corresponding wheel comprising: electrically operated valve means for relieving braking pressure in said brake controlling said corresponding wheel to prevent skidding of the latter; and control means for actuating said valve means including means for generating a speed signal proportional to the angular velocity of said wheel, means for differentiating said speed signal to generate a signal proportional to acceleration and deceleration of said wheel, means for comparing said last-mentioned signal to first and second reference values and generating a first control signal when the value of the acceleration and deceleration signal drops below the value of said first reference level and terminating said first control signal when the value of the acceleration and deceleration signal increases above the value of said second reference signal, logic means having a first input terminal connected to said comparing means, a second input terminal, and an output terminal connected to said valve means, said logic means generating an ouTput signal actuating said valve means when signals are transmitted to both of said input terminals or to said first input terminal alone, said logic means extinguishing the output signal on said output terminal if a signal is transmitted to said second input terminal alone, the output signal on said output terminal being unaffected if the signals on both of said input terminals terminate, and memory means responsive to generation of said output signal to memorize a value corresponding to a predetermined percentage of the value of said speed signal, means for comparing said memorized value with the instantaneous value of said speed signal and generating a control signal if said instantaneous value of said speed signal is greater than said memorized value, said lastmentioned control signal being transmitted to the second input terminal of said logic means.
Claim 2
Dependent Claim
318 words
In a wheeled vehicle having a brake for braking a corresponding wheel, an adaptive braking system for controlling said brake to prevent skidding of said corresponding wheel comprising: electrically operated valve means for relieving braking pressure in said brake controlling said corresponding wheel to prevent skidding of the latter; and control means for actuating said valve means including means for generating a speed signal proportional to the angular velocity of said wheel, means for differentiating said speed signal to generate a signal proportional to acceleration and deceleration of said wheel, means for comparing said last-mentioned signal to first and second reference values and generating a first control signal when the value of the acceleration and deceleration signal drops below the value of said first reference level and terminating said first control signal when the value of the acceleration and deceleration signal increases above the value of said second reference signal, logic means having a first input terminal connected to said comparing means, a second input terminal, and an output terminal connected to said valve means, said logic means generating an ouTput signal actuating said valve means when signals are transmitted to both of said input terminals or to said first input terminal alone, said logic means extinguishing the output signal on said output terminal if a signal is transmitted to said second input terminal alone, the output signal on said output terminal being unaffected if the signals on both of said input terminals terminate, and memory means responsive to generation of said output signal to memorize a value corresponding to a predetermined percentage of the value of said speed signal, means for comparing said memorized value with the instantaneous value of said speed signal and generating a control signal if said instantaneous value of said speed signal is greater than said memorized value, said lastmentioned control signal being transmitted to the second input terminal of said logic means.
Claim 3
Dependent Claim
29 words
The invention of claim 1: said memory means memorizing a predetermined percentage of said speed signal, said predetermined percentage being less than the full value of said speed signal.
Claim 4
Dependent Claim
84 words
The invention of claim 2: said memory means including a capacitor, said capacitor being charged to a voltage corresponding to said predetermined percentage of said wheel speed, a discharge circuit in parallel to said capacitor, switch means controlling said discharge circuit whereby the capacitor is continually charged as long as said switch means is closed, said switch means being opened in response to initial generation of said output signal so that the voltage across said capacitor when said output signal is generated is retained.
Claim 5
Dependent Claim
39 words
The invention of claim 3; said discharge circuit including resistor connected in parallel with said capacitor so that the voltage retained across the latter when said switch means is opened is decayed through said resistor at a predetermined rate.
Claim 6
Dependent Claim
31 words
The invention of claim 1: said control means including means for decaying said memorized value at a predetermined rate after actuation of the memory means by generation of the output signal.
Claim 7
Dependent Claim
77 words
The invention of claim 1: said memory means including a capacitor, said capacitor being charged to a voltage corresponding to said predetermined percentage of said wheel speed, a discharge circuit for said capacitor including a relatively large resister in parallel with said capacitor and a smaller resistor and switching means controlling said smaller resistor in parallel with said capacitor and with said larger resistor, said switch being normally closed but opening in response to said output signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |