Exhaust gas purification device for an internal combustion engin

Power plants – Internal combustion engine with treatment or handling of... – Material from exhaust structure fed to engine intake

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Details

60285, 60301, 60311, F01N 320, F02M 2506

Patent

active

057325545

ABSTRACT:
In the exhaust gas purification device of the present invention, a NO.sub.x absorbent is disposed in the exhaust gas passage of a diesel engine. At the time when NO.sub.x should be released from the NO.sub.x absorbent, a control circuit of the engine reduces the excess air ratio of the engine, and switches the combustion mode of the engine from the normal diesel combustion, in which diffusive combustion is dominant in the combustion chamber of the engine, to the combustion mode in which pre-mixture fuel combustion is dominant. By doing this, it is possible, even in a diesel engine, to reduce the excess air ratio in combustion to thereby make the air-fuel ratio of the exhaust gas lower than or equal to the stoichiometric. Thus, the regeneration of the NO.sub.x absorbent can be performed even when it is applied to a diesel engine.

REFERENCES:
patent: 4841936 (1989-06-01), Takahashi
patent: 5119780 (1992-06-01), Ariga
patent: 5172550 (1992-12-01), Takeshima
patent: 5233830 (1993-08-01), Takeshima
patent: 5473887 (1995-12-01), Takeshima

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