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:
Apr. 03, 2001
Filed:
Nov. 09, 1998
Gerhard Wissler, Sünching, DE;
Günther Pajonk, Zapfendorf, DE;
Lothar Hofmann, Altenkunstadt, DE;
Manfred Weigl, Viehhausen, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
Excessive NO,emission in a diesel internal combustion engine with SCR exhaust gas treatment is detected by a control unit. The excessive NO,emission value is determined from the catalytic-converter efficiency calculated for the metering of the reducing agent. In response, measures are taken, such as delayed start of the fuel injection, deactivation of a coasting cutoff, reducing an exhaust gas recirculation rate and/or increasing the idling speed. As a result, the NO,content in the untreated exhaust gas drops, the catalytic-converter temperature increases more quickly after a cold start, and the NO,emission is reduced.