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:
Oct. 06, 1981
Filed:
Sep. 02, 1980
Lothar Bendig, Ludwigsburg, DE;
Filterwerk Mann & Hummel GmbH, Ludwigsburg, DE;
Abstract
A flapper-type combustion air mixing valve at the junction between a cold air intake duct and a warm air intake duct, the flapper being pivotally adjustable by means of an electropneumatic actuator which has a spring-loaded diaphragm separating an enclosed air-filled pressure chamber from an open drive chamber accommodating the spring and the flapper drive linkage. A heater coil in the pressure chamber receives variable power from a signal transformer, in response to a combustion air temperature sensor and a flapper position sensor. A load-responsive vacuum switch connected to the engine intake manifold switches the signal transformer between adjustments for a higher nominal control temperature for partial-load operation and a lower nominal control temperature for full-load operation.