Method and apparatus for controlling air cylinder

Details Method and apparatus for controlling air cylinder Method and apparatus for controlling air cylinder

2007-05-01

2007-05-01

Lazo, Thomas E. (Department: 3745)

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

C091S459000, C060S368000, C700S056000

Reexamination Certificate

active

11142094

ABSTRACT:
A method for controlling an air cylinder such that air is supplied to and exhausted from pressure chambers of the air cylinder by air servo valves. Pressures in the pressure chambers are detected by pressure sensors, signals of the detected pressures are feedback to a controller, and the degrees of opening of the air servo valves are adjusted by corresponding PID adjusters of the controller on the basis of the respective differences between instruction values and detection values. The displacement of the rod of the air cylinder is detected by a displacement sensor, and a detection signal of the displacement is fed back to the controller so that a gain of the PID adjuster is always changed in accordance with the detection signal of the displacement.

REFERENCES:
patent: 5230272 (1993-07-01), Schmitz
patent: 5424941 (1995-06-01), Bolt et al.
patent: 5457959 (1995-10-01), Langguth et al.
patent: 6705199 (2004-03-01), Liao et al.
patent: 6799501 (2004-10-01), Yo et al.
patent: 7062832 (2006-06-01), Yo et al.
patent: 7076314 (2006-07-01), Saitou

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