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:
May. 22, 1979
Filed:
Mar. 22, 1978
Istvan Geiger, Brunswick, DE;
Rudolf Krapf, Leimen, DE;
Volkswagenwerk Aktiengesellschaft, Wolfsburg, DE;
Abstract
A device is provided for controlling the flow of exhaust gases of an internal combustion engine in accordance with the operating conditions of the engine. Exhaust gases flowing from the exhaust manifold are routed either directly to the muffler or to a heat exchanger for heating the intake air/fuel mixture. The device includes a housing having ceramic valve which is rotatable in the housing and which has two parallel gas passages separated by a web-like wall. In a first rotational position of the valve, the flow of gases is directed from the manifold through both passages and directly out to the muffler. When the valve is in a second rotational position, the flow of gases is directed through one of the two passages and into the heat exchanger. From the heat exchanger, the flow is directed back through a return line into the second passage of the valve and thereafter to the muffler.