Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1996-11-29
1998-04-14
Argenbright, Tony M.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60277, 731181, F01N 320
Patent
active
057379173
ABSTRACT:
A device for judging the deterioration of a three-way catalyst comprising an upstream O.sub.2 sensor and a downstream O.sub.2 sensor which are arranged in the exhaust passage upstream and downstream of the three-way catalyst respectively. When the ratio of length of the output signal response curve of the downstream O.sub.2 sensor and the length of the output signal response curve of the upstream O.sub.2 sensor is over a threshold level, it is judged that the three-way catalyst has deteriorated. The judgement of deterioration of the three-way catalyst is performed when the three-way catalyst starts to be activated. At this time, the lower the temperature of the downstream O.sub.2 sensor, the lower the threshold level is made.
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Argenbright Tony M.
Toyota Jidosha & Kabushiki Kaisha
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