Catalyst deterioration-determining device of an internal combust

Details Catalyst deterioration-determining device of an internal combust Catalyst deterioration-determining device of an internal combust

1994-12-21

1996-07-02

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, F01N 320

Patent

active

055310699

ABSTRACT:
A catalyst deterioration-determining device for an internal combustion engine, in which a temperature sensor for detecting the temperature of a catalyst body is eliminated, but high-precision determination can be made to the deterioration of the catalyst body. To this end, a control unit determines, on the basis of a warm-up counter used for a catalyst body, whether or not the catalyst body is in a predetermined warm-up state. The warm-up counter reckons in relation to any engine load of an internal combustion engine. If the catalyst body is found to be in the predetermined warm-up state according to the above determination, the control unit determines whether or not deterioration-determining conditions for the catalyst body have been fulfilled.

REFERENCES:
patent: 5325664 (1994-07-01), Seki
patent: 5363647 (1994-11-01), Ohuchi

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