Method of controlling solenoid valves for a hydraulic actuator,

Details Method of controlling solenoid valves for a hydraulic actuator, Method of controlling solenoid valves for a hydraulic actuator,

1990-09-07

1992-06-09

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91459, F15B 1316

Patent

active

051197170

ABSTRACT:
There is disclosed a method of controlling a hydraulic actuator by using a normally closed solenoid valve and two normally open solenoid valves and selectively actuating them to place the piston of a hydraulic cylinder in position. The normally closed valve is installed in the fluid passage connecting a hydraulic pressure generator with the hydraulic cylinder and on the side of the generator. The normally open valves are connected in series downstream of the normally closed valve. At the beginning of the operation of the cylinder, the normally closed valve is opened after a lapse of a waiting time long enough for that of the normally open valves which corresponds to the direction of movement of the piston to be closed completely. At the end of the operation of the cylinder, the normally open valves are opened after a lapse of another waiting time long enough for the normally closed valve to be closed completely.

REFERENCES:
patent: 3744374 (1973-07-01), Schneider et al.
patent: 3768375 (1973-10-01), Flaschar et al.
patent: 3831495 (1974-08-01), Arnold et al.
patent: 3964260 (1976-06-01), Williams et al.
patent: 4587883 (1986-05-01), Ehrentraut et al.
patent: 4595979 (1986-06-01), Arai et al.
patent: 4813335 (1989-03-01), Wakiya et al.
patent: 4896553 (1990-01-01), Sato et al.

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