Automatic pneumatic pressure control apparatus and method of con

Details Automatic pneumatic pressure control apparatus and method of con Automatic pneumatic pressure control apparatus and method of con

1998-04-30

2000-11-21

Shaver, Kevin

Fluid handling

Processes

25112904, F16K 3102

Patent

active

061488372

ABSTRACT:
When a reference signal is changed stepwise, a switch is open, and a pneumatic device with a dead time starts being actuated in a PD control mode. After elapse of the dead time, when a controlled variable changes and a position detector produces an output signal, a speed signal which is a differential of a feedback signal changes from a value "0". When a speed detector detects when the speed signal is equal to or greater than a predetermined value, a switching signal is applied to close the switch. After the switch is closed, the pneumatic device is actuated in a PID mode. An overshoot or an oscillation in a controlled variable due to the integration of the dead time in an I control mode can be suppressed.

REFERENCES:
patent: 3699989 (1972-10-01), O'Connor et al.
patent: 4354224 (1982-10-01), Sato
patent: 4638837 (1987-01-01), Buike et al.
patent: 5059880 (1991-10-01), Hiroi
patent: 5335165 (1994-08-01), Shinskey
patent: 5573032 (1996-11-01), Lenz et al.

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