Electrical-pneumatic system

Details Electrical-pneumatic system Electrical-pneumatic system

1996-09-13

1997-12-23

Michalsky, Gerald A.

Fluid handling

Pressure modulating relays or followers

With counter-balancing pressure feedback to the modulating...

137 82, G05B 1150

Patent

active

056998244

ABSTRACT:
An electrical-pneumatic system has a controller which has an input terminal for a reference variable signal, an input terminal for a regulating variable or feedback signal and an output terminal for a manipulated variable signal, which preferably is a pulse-width modulated signal. The controller will actuate a drive unit of an electrical-pneumatic pre-control unit, which has a 3/2 directional control valve that responds to the pulse-width modulated signal from the controller. The output of the 3/2 directional control valve is smoothed by being passed through a throttle and into a volume, and a pneumatic booster is connected downstream from the volume. The output of the pneumatic booster is sensed and provides the feedback signal.

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B. Koenig et al, "Ein intelligenter elektropneumatischer Stellungsregler", atp 31, No. 8, 1989, pp. 367-373.
M. Leufgen et al, "Pneumatischer Positionierantrieb mit Schaltventilen", Olhydraulik und Pneumatik, O+P35, No. 2, 1991, pp. 127-132.
P. Tappe, "Servopneumatischer Kleinzylinderantrieb mit Schaltventilen", Olhydraulik und Pneumatik, O+P39, No. 6, 1995, pp. 474-476.

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