Apparatus for judging deterioration of catalyst of internal comb

Details Apparatus for judging deterioration of catalyst of internal comb Apparatus for judging deterioration of catalyst of internal comb

1993-08-04

1995-01-10

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, F01N 328

Patent

active

053795873

ABSTRACT:
A catalyst deterioration judging apparatus for an internal combustion engine wherein first and second exhaust sensors are provided on the exhaust passage respectively upstream and downstream of a catalyst material provided in the exhaust passage. A control arrangement determines deterioration of the catalyst by sensing the exhaust gas upstream and downstream of the catalyst, and provides a feedback control for controlling the air-fuel ratio.

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