Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1977-06-16
1978-10-31
Kunin, Stephen G.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 20, 303DIG1, B60T 800
Patent
active
041231163
ABSTRACT:
An adaptive braking system for a vehicle having fluid pressure operated brakes includes a skid detecting circuit for generating a skid detecting signal when an incipient skidding condition is detected, a pressure command generator which is responsive to the skid detecting signal for generating a pressure command signal, and a duty cycle translator responsive to the pressure command signal to actuate the brake pressure modulator. The duty cycle translator includes a circuit which generates a signal modeling the actual pressure level in the vehicle brake actuators. Since the modulator is actuated by a solenoid which is powered by the vehicle electrical supply, the opening and closing times of the solenoid will vary as a function of the power output of the vehicle power supply, which can vary over a substantial range depending upon ambient temperature and upon the strength of the vehicle battery. Accordingly, the duty cycle translator includes a circuit which models the opening and closing times of the solenoid actuators and the reaction time of the mechanical valve components to thereby more closely model the actual pressure level in the vehicle brake actuators.
REFERENCES:
patent: 3706971 (1972-12-01), Okamoto et al.
patent: 3737201 (1973-06-01), Okamoto et al.
patent: 3782783 (1974-01-01), Jones
patent: 3838892 (1974-10-01), Davis et al.
patent: 3854779 (1974-12-01), Skoyles et al.
patent: 3953083 (1976-04-01), Latvala et al.
patent: 3958835 (1976-05-01), Rothfusz et al.
Ang Leoncio T.
Carp Ralph W.
Rini Guy T.
Antonis William N.
Decker Ken C.
Kunin Stephen G.
The Bendix Corporation
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