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:
Jul. 25, 1995
Filed:
Feb. 02, 1994
Stephan Pelters, Tiefenbronn, DE;
Dietmar Schwarzenthal, Bergisch Gladbach, DE;
Dr. Ing. h.c.F. Porsche AG, Weissach, DE;
Abstract
For testing the conversion rate of exhaust gas catalysts inserted in an exhaust gas train of an internal-combustion engine, a process is provided which first requires a first operating condition during a time period while specified marginal requirements are met. If these requirements are met, an exhaust gas pulse is generated during a second time period, for example, during a coasting operation, which exhaust gas pulse does not correspond to this condition. The reaction of a temperature sensor which is arranged downstream of the catalyst is then analyzed. If the change of the exhaust gas temperature because of the exhaust gas pulse is not within specified limits, a signal is triggered which indicates an unacceptably low conversion rate.