Positioning apparatus and method utilizing PWM control of a doub

Details Positioning apparatus and method utilizing PWM control of a doub Positioning apparatus and method utilizing PWM control of a doub

1995-04-17

1996-08-06

Nguyen, Hoang

Motors: expansible chamber type

Application of motive fluid at different pressures to...

Double acting motor reversed by pressure variation of motive...

91415, 91459, 91462, F01B 100, F15B 1517

Patent

active

055423361

ABSTRACT:
A double-acting hydraulic cylinder is controlled by a pair of three-way solenoid valves respectively fluid connected to the two ends of the cylinder and energized in parallel with a continuous stream of pulse width modulated (PWM) pulses to create a mean effective fluid pressure balance at the cylinder ends that hold a desired position of a connected load and mean effective fluid pressure imbalances in the cylinder ends that produce variable rate load movement in either of two directions to a desired new position, all determined by the pulse duty cycle.

REFERENCES:
patent: 3479924 (1969-11-01), Ferguson
patent: 4450753 (1984-05-01), Basrai et al.
patent: 4813339 (1989-03-01), Uno et al.
patent: 4932311 (1990-06-01), Mibu et al.
patent: 4951468 (1990-08-01), Sasajima
patent: 5284083 (1994-02-01), Vaslin

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