Exhaust gas purification device for an engine

Details Exhaust gas purification device for an engine Exhaust gas purification device for an engine

1994-02-28

1995-02-14

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 60289, 60307, 123687, F01N 320

Patent

active

053884035

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 concentration of oxygen in the exhaust gas is lowered. When the air-fuel ratio of air-fuel mixture fed into the engine cylinder is made a rich air-fuel ratio or the stoichiometric air-fuel ratio, a secondary air is fed into the exhaust passage upstream of the NO.sub.x absorbent to make the air-fuel ratio of exhaust gas lean.

REFERENCES:
patent: 4972737 (1990-11-01), Makimoto
patent: 5119631 (1992-06-01), Kayanuma
patent: 5163412 (1992-11-01), Neu
patent: 5271223 (1993-12-01), Hoshi
patent: 5325663 (1994-07-01), Itoh
patent: 5331809 (1994-07-01), Takeshima
patent: 5333446 (1994-08-01), Itoh

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