Method of checking the performance of catalysts in internal-combustion engines

US6668631B1 · kind B1 · utility

Assignees

• Dr. Ing. h.c. F. Porsche AG · DE
• AUDI AG · DE
• Bayerische Motoren Werke Aktiengesellschaft · DE
• VOLKSWAGEN AKTIENGESELLSCHAFT · DE
• Daimlerchrysler AG · US

Inventors

• Paul Kueper · Wiernsheim, DE
• Stefan Peter · Groß-Umstadt, DE
• Jens Mueller · Löhne, DE

Key dates

• Filing date: Jul 12, 2001
• Grant date: Dec 30, 2003
• Expiry date: Jul 12, 2021

Classification

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

Abstract

A process is suggested for checking the catalyst performance in internal-combustion engines, in which by means of detected operating parameters of the internal-combustion engine similar operating conditions are determined. It is suggested to compute from a defined number of measured exhaust gas values during a similar operating condition a statistically backed average exhaust gas value and compare it with a permissible exhaust gas value stored for this operating condition, so that a defective catalyst is recognized in the event of a deviation of the actually determined exhaust gas value from the permissible exhaust gas value.