Valve arrangement for closed-loop control system

Details Valve arrangement for closed-loop control system Valve arrangement for closed-loop control system

1976-12-27

1978-09-26

Capossela, Ronald C.

192 clutches and power-stop control

Clutches

Operators

192104F, 192109F, F16D 2310, F16D 4306

Patent

active

041163214

ABSTRACT:
A two-stage, four-way valve has fluid input and output connections, and passes a fluid under controlled pressure to an actuator to operate any component. Such operation is sensed and, after comparison with a reference signal, a control signal regulates the duty cycle of a pulse-width modulation (PWM) circuit. The output square-wave signal from the PWM circuit regulates a solenoid incorporated in the valve, to modify its operation and regulate the pressure of the controlled fluid. The valve has a spool which effectively integrates the PWM signal and provides a type 1 servo system when connected in a closed loop system.

REFERENCES:
patent: 3437188 (1969-04-01), Long
patent: 3599764 (1971-08-01), Daab et al.
patent: 3752284 (1973-08-01), Brittain et al.
patent: 3915271 (1975-10-01), Harper
patent: 4019614 (1977-04-01), Prenzel et al.
patent: 4040508 (1977-08-01), Sunada et al.

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