Exhaust purification device of an engine

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

1996-03-22

1998-04-07

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 60297, 60301, F01N 320

Patent

active

057351198

ABSTRACT:
An exhaust gas purification device of an engine providing a NO.sub.x absorbent arranged in the exhaust passage. An O.sub.2 sensor is arranged in the engine exhaust passage downstream of the NO.sub.x absorbent. The degree of deterioration of the NO.sub.x absorbent is detected from the output signal of the O.sub.2 sensor. The cycle for making the air-fuel ratio of the air-fuel mixture rich for causing the release of the NO.sub.x from the NO.sub.x absorbent and the rich time at that time are shortened the greater the deterioration of the NO.sub.x absorbent.

REFERENCES:
patent: 5437153 (1995-08-01), Takeshima et al.
patent: 5473887 (1995-12-01), Takeshima et al.
patent: 5483795 (1996-01-01), Katoh et al.
patent: 5577382 (1996-11-01), Kihara et al.

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