Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1996-03-27
1998-02-03
Argenbright, Tony M.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60277, 60285, 60297, 60301, F01N 310, F02D 4102
Patent
active
057131996
ABSTRACT:
A device for detecting deterioration of a NO.sub.x absorbent arranged in the exhaust passage of an engine. An O.sub.2 sensor generating a current proportional to the air-fuel ratio is arranged in the exhaust passage downstream of the NO.sub.x absorbent. When the amount of NO.sub.x absorbed in the NO.sub.x absorbent is almost zero or after the amount of NO.sub.x absorbed in the NO.sub.x absorbent is made almost zero, the air-fuel ratio of the air-fuel mixture is changed from lean to rich, and the amount of oxygen stored in the NO.sub.x absorbent is detected from the output signal of the O.sub.2 sensor at this time. Further, the NO.sub.x absorbing capability is found by using this detected oxygen amount.
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, abstract of JP-06-272546-A (Toyota Motor Corp.), Sep. 27, 1994.
Patent Abstracts of Japan, vol. 018, No. 563 (M-1693), Oct. 27, 1994, abstract of JP-06-200737-A (Toyota Motor Corp.), Jul. 19, 1994.
Asanuma Takamitsu
Iguchi Satoshi
Katoh Kenji
Kihara Tetsuro
Takeshima Shinichi
Argenbright Tony M.
Toyota Jidosha & Kabushiki Kaisha
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