Method and device for lambda control and for catalytic converter diagnosis in an internal combustion engine

US7003943B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Alexander Ketterer · Nittendorf, DE
• Hong Zhang · Schwieberdingen, DE

Key dates

• Filing date: May 4, 2004
• Grant date: Feb 28, 2006
• Expiry date: Jul 9, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In the present invention lambda control is carried out by using a NOx sensor which is arranged in the catalytic converter or downstream of this. At the same time on the basis of the measured NOx values the operating status is adjusted and the oxygen storage capacity of the catalytic converter is determined for diagnostic purposes.