Method for controlling a hydraulic piston/cylinder unit

Details Method for controlling a hydraulic piston/cylinder unit Method for controlling a hydraulic piston/cylinder unit

2007-04-10

2007-04-10

Leslie, Michael (Department: 3745)

Power plants

Pressure fluid source and motor

Cyclically operable reciprocating or oscillating motor or...

Reexamination Certificate

active

10514443

ABSTRACT:
The control of the pressure supply to a piston-cylinder unit (10) is effected by monitoring the pressure in the corresponding line (16) through a pressure sensor (22). This pressure is measured in fixed time intervals and the changes in pressure are determined. When the change in pressure has become zero, it is detected that the set terminal pressure has been reached so that the working operation is ended. A switching to the return stroke is effected when the pressure increase in at least one time interval is greater than in at least one of the previous intervals of the working operation. The control is independent from the type of piston-cylinder unit employed and requires no sensors at the piston-cylinder unit.

REFERENCES:
patent: 4864903 (1989-09-01), Bickford et al.

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