Method of controlling an engine exhaust gas system and method of

Details Method of controlling an engine exhaust gas system and method of Method of controlling an engine exhaust gas system and method of

1997-06-16

1999-09-21

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60285, 60286, 60297, F01N 320

Patent

active

059539070

ABSTRACT:
In a method of controlling an exhaust gas system of an internal combustion engine including a nitrogen oxide reducing catalyst capable of adsorbing nitrogen oxide under a lean atmosphere and a nitrogen oxide sensor disposed downstream of the nitrogen oxide reducing catalyst, the nitrogen oxide reducing catalyst and the nitrogen oxide sensor are disposed in the exhaust gas system operated mainly under a lean condition, respectively. An output value of the nitrogen oxide sensor is compared with a predetermined value, and an operation condition of the internal combustion engine is temporarily changed into a stoichiometric condition or a rich condition, or a fuel is injected upstream of the nitrogen oxide reducing catalyst, so that the nitrogen oxide adsorbed to the nitrogen oxide reducing catalyst is detached or decomposed, and again the internal combustion engine is operated under the lean condition.

REFERENCES:
patent: 5410873 (1995-05-01), Tashiro
patent: 5483795 (1996-01-01), Katoh et al.
patent: 5713199 (1998-02-01), Takeshima et al.
patent: 5715679 (1998-02-01), Asanuma et al.
patent: 5735119 (1998-04-01), Asanuma et al.
patent: 5771686 (1998-06-01), Pischinger et al.
"Evaluation of Nox Storage Catalysts as an Effective System for Nox Removal from the Exhaust Gas of Leanburn Gasoline Engines"; M.S. Brogan, R.J. Brisley, A.P. Walker, and D.E. Webster.

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