Exhaust arrangement for a gasoline

Details Exhaust arrangement for a gasoline Exhaust arrangement for a gasoline

1995-05-24

1996-12-10

Heyman, Leonard E.

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60275, 60301, F01N 316

Patent

active

055820050

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.

REFERENCES:
patent: 3950944 (1976-04-01), Shidahara et al.
Patent Abstract of Japan for JP 58-143,113 dated Aug. 25, 1983.
Patent Abstract of Japan for JP 61-242,622 dated Oct. 28, 1986.
European Search Report dated Oct. 9, 1995.

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