Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1977-11-21
1979-08-14
Kunin, Stephen G.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 20, B60T 808
Patent
active
041643607
ABSTRACT:
A control circuit having an adaptive turn-off feature for a vehicle skid control braking system, wherein the control circuit is responsible for producing a brake control signal which is effective to disengage the brakes of the vehicle by actuating a brake control valve to a fluid pressure-relieving position. The control circuit features an adaptive turn-off circuit which terminates the brake control signal, thereby enabling re-engagement of the vehicle brakes depending on the coefficient of friction of the road surface being travelled by the vehicle and the degree to which the wheel speed departs from the vehicle speed during the brake disengage cycle of the control circuit. The adaptive turn-off circuit of the control circuit utilizes a wheel departure amplifier which provides an inverted wheel departure signal as determined during a brake disengage cycle of the control circuit, the inverted wheel departure signal being referenced to a zero voltage. The adaptive turn-off circuit also includes a lead resistor which effectively shifts the inverted wheel departure signal by an amount proportional to the coefficient of friction of the road surface. The adaptive turn-off circuit further includes a turn-off threshold circuit, the output of the wheel departure amplifier being received as an input by the turn-off threshold circuit so as to produce an output signal from the adaptive turn-off circuit terminating the brake control signal from the control circuit whenever the output of the wheel departure amplifier falls below the threshold value of the turn-off threshold circuit.
REFERENCES:
patent: 3578819 (1971-05-01), Atkins
patent: 3825305 (1974-07-01), Kasselmann et al.
patent: 3833270 (1974-09-01), Gotz et al.
patent: 3861756 (1975-01-01), Arikawa
patent: 3863993 (1975-02-01), Fleischer et al.
patent: 3980349 (1976-09-01), Cook
patent: 3982793 (1976-09-01), Jones
patent: 3993363 (1976-11-01), Skoyles et al.
Donaldson Richard L.
Hiller William E.
Kunin Stephen G.
Sharp Melvin
Texas Instruments Incorporated
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