The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 1997
Filed:
Sep. 13, 1996
Lothar Kemmler, Moerfelden-Walldorf, DE;
Stefan Kolbenschlag, Darmstadt, DE;
Samson Aktiengesellschaft, Frankfurt am Main, DE;
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.