Method for adjusting the metered quantity of reducing agent for selective catalytic reduction

US8341944B2 · kind B2 · utility

Assignee

• MAN Nutzfahrzeuge AG · DE

Inventors

• Florian Walde · Dietenhofen, DE
• Andreas Döring · Unterhaching, DE

Key dates

• Filing date: Mar 8, 2010
• Grant date: Jan 1, 2013
• Expiry date: Feb 23, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A method for application in conjunction with an exhaust gas post-treatment system for metering an ammonia-releasing reducing agent into the exhaust gas stream of an internal combustion engine installed in a motor vehicle and operated with excess air. A control unit meters the quantity of reducing agent as a function of a stored model and during the operation of the internal combustion engine varies the metered quantity during certain operating phases and compares the change in the measured value of at least one NOx sensor installed downstream of the SCR catalyst with an expected value.