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. 05, 1993
Filed:
Sep. 21, 1992
Istvan Geiger, Braunschweig, DE;
Volkswagen AG, Wolfsburg, DE;
Abstract
In the typical embodiment described in the specification, the exhaust system of an internal combustion engine has two exhaust lines with corresponding catalyst assemblies, each assigned to one group of combustion chambers. During the cold start of the engine, an electric heater included in one of the exhaust lines heats exhaust gases flowing to a first catalyst assembly and the catalyst assemblies are connected in series so that the exhaust gases supplied to the second catalyst assembly are received from the first catalyst assembly. In addition, the ignition point of the engine is retarded after idling speed is reached. To avoid overheating of the catalyst assemblies, the catalyst assemblies receive exhaust gases only after their start-up temperatures are reached from the groups of combustion chambers associated with them and an exhaust cooling line is provided to cool exhaust gases flowing to the first catalyst assembly.