Exhaust purification device of an engine

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

1996-03-22

1998-02-10

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 60297, 60301, F01N 310, F02D 4102

Patent

active

057156794

ABSTRACT:
An exhaust purification device of an engine providing a NO.sub.x absorbent arranged in the exhaust passage. An O.sub.2 sensor generating a current proportional to the air-fuel ratio is arranged in the engine exhaust passage downstream of the NO.sub.x absorbent. The amount of NO.sub.x actually absorbed in the NO.sub.x absorbent at the time of release of the NO.sub.x is calculated on the basis of the output signal of this O.sub.2 sensor. On the basis of this calculated amount of NO.sub.x, correction is made so that the estimated amount of NO.sub.x represents the actual amount of absorption of NO.sub.x. When this corrected estimated amount of NO.sub.x reaches a set value, the action of releasing the NO.sub.x from the NO.sub.x absorbent is carried out.

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.
Patent Abstracts of Japan, vol. 018, No. 691 (M-1731), Dec. 26, 1994 & JP-06-272546 (Toyota Motor Corp.), Sep. 27, 1994.
Patent abstracts of Japan, vol. 94, No. 010 & JP-06-280550 (Toyota Motor Corp.), Oct. 4,1994.
Patent Abstracts of Japan, vol. 018, No. 691 (M-1731), Dec. 26, 1994 & JP-06-272540 (Toyota Motor Corp.), Sep. 27, 1994.

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