Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Patent
1989-01-12
1990-02-20
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
318564, 318561, 91363A, G05B 902
Patent
active
049029479
ABSTRACT:
A servo circuit with a failure detection mechanism comprising: a servo circuit for servo controlling on the basis of a control signal an actuator which is connected through a hydraulic circuit with a source of oil pressure and is operated by the hydraulic circuit which is changed over by a servo valve; a monitor circuit arranged in parallel relationship with the servo circuit and generating a monitor control signal; and a failure detection circuit in which the control signal of the servo circuit and the monitor control signal of the monitor circuit are inputted and which detects a failure of the servo circuit on the basis of the control signal and the monitor control signal; wherein the hydraulic circuit is provided with pressure detecting means for detecting a pressure thereof; and the monitor circuit includes a correction circuit in which a pressure signal from the pressure detecting means is inputted and which corrects a loop gain of the monitor circuit in correspondence with a value of the pressure signal.
REFERENCES:
patent: 4159444 (1979-06-01), Bartlett et al.
patent: 4345191 (1982-08-01), Takata et al.
patent: 4398242 (1983-08-01), Buus
patent: 4436018 (1984-03-01), Murphy et al.
patent: 4629954 (1986-12-01), Bonzai et al.
patent: 4829220 (1989-05-01), Fabre
Bergmann Saul M.
Shoop Jr. William M.
Teijin Seiki Company Limited
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