Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1986-01-24
1989-12-19
Cohan, Alan
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
13759617, G05D 1600
Patent
active
048876364
ABSTRACT:
Apparatus for continuously controlling an electrically-actuated solenoid valve which regulates the fluid pressure conveyed to a brake cylinder. The solenoid valve is designed for intermittent operation. A pressure transducer senses and generates an actual value signal, which is proportional to the pressure to be regulated. A set value generator produces a select set value signal. A comparator device generates a pulse-type control signal having a variable width repetition rate within a certain pressure range for the solenoid valve in accordance with the difference between the actual value signal and the set value signal. In order to regulate the pressure more precisely and more quickly, without dependence on outer influences, the comparator device generates the control signal for controlling the solenoid valve within a predetermined initial pressure range, in accordance with the actual value pressure sensed by the pressure transducer in such a way that the solenoid valve is slightly opened by being pulsed from a closed-valve position.
REFERENCES:
patent: 3874407 (1975-04-01), Griswold
patent: 4241750 (1980-12-01), Furuse et al.
patent: 4253480 (1981-03-01), Kessel
Cohan Alan
Sotak J. B.
Wabco Westinghouse Fahrzeugbremsen GmbH
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