Method for operating the catalyst of an internal combustion engine

US6494036B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Eberhard Schnaibel · Hemmingen, DE
• Andreas Koring · Ludwigsburg, DE
• Holger Bellmann · Ludwigsburg, DE
• Thomas Wahl · Pforzheim, DE
• Andreas Blumenstock · Ludwigsburg, DE
• Klaus Winkler · Rutesheim, DE
• Frank Stanglmeier · Heubach, DE
• Bernd Schumann · Rutesheim, DE

Key dates

• Filing date: Nov 26, 2001
• Grant date: Dec 17, 2002
• Expiry date: Nov 26, 2021

Classification

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

Abstract

An internal combustion engine (1), especially for a motor vehicle, is described, which has a catalytic converter (12) which can be loaded with and unloaded of nitrogen oxides. An NOx sensor (14) is provided with which NOx emissions can be measured downstream of the catalytic converter (12). The catalytic converter (12) can be only partially loaded by a control apparatus (18). An increased NOx emission can be generated forward of or in the catalytic converter (12) by the control apparatus (18). A conclusion can be drawn as to the operability of the catalytic converter (12) by the control apparatus (18) from NOx emissions measured downstream.