Exhaust gas purification device of an engine

Details Exhaust gas purification device of an engine Exhaust gas purification device of an engine

1993-09-01

1995-06-13

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 60297, 60301, F01N 320

Patent

active

054231817

ABSTRACT:
An engine comprising an exhaust passage having therein a NO.sub.x absorbent which absorbs the NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent is lean and releases the absorbed NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent becomes the stoichiometric air-fuel ratio or rich. When the air-fuel ratio of the air-fuel mixture should be changed over from lean to the stoichiometric air-fuel ratio, the air-fuel ratio of the air-fuel mixture is temporarily made rich and is then made the stoichiometric air-fuel ratio.

REFERENCES:
patent: 5174111 (1992-12-01), Nomura
patent: 5209061 (1993-05-01), Takeshima
patent: 5233830 (1993-08-01), Takeshima
patent: 5270024 (1993-12-01), Kasahara
patent: 5331809 (1994-07-01), Takeshima
NO Removal by Absorption into BaO-CuO Binary Oxides (J. Chem. Soc., Hm. Coummun., pp. 1165-1166), 1990.
Formation and Decomposition of BaCuO.sub.2. 5 Prepared from a Mixture of Nitrates (Journal of Solid state chemistry, pp. 176-179), 1991.
NO Removal by Absorption into Ba-Cu-O Binary Oxides (Catalyst vol. 33 No. 2 pp. 87-90), 1991.

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