Patent · US Expired

Exhaust arrangement for a gasoline

US5582005A · kind A · utility

6Cited by

1References

6Claims

0Family size

Assignee

Daimler-Benz AG · DE

Inventors

Klaus Wunderlich · Waiblingen, DE
Stefan Pischinger · Aachen, DE
Bernd Krutzsch · Köngen, DE
Martin Bechtold · Stuttgart, DE

Key dates

Filing date	May 24, 1995
Grant date	Dec 10, 1996
Priority date	—
Expiry date	May 24, 2015

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/12
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

The invention relates to a gasoline engine having a catalyst for reducing the emission pollutants, with an oxygen absorption device located in the exhaust line upstream of the catalyst. According to the invention, the gasoline engine is operated in a first operating range with a lean air/fuel ratio (.lambda.), and oxygen is removed from the exhaust by the absorption device. In a second operating range, the gasoline engine is operated at .lambda.=1, and the absorption device is bypassed or deactivated. In the case of a gasoline engine with a Denox catalyst the gasoline engine is operated constantly with a lean air/fuel ratio, with the active surface of the Denox catalyst being "depoisoned" temporarily by activating the oxygen absorption device.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.