Catalyst deterioration-detecting system for internal combustion

Details Catalyst deterioration-detecting system for internal combustion Catalyst deterioration-detecting system for internal combustion

1994-01-21

1995-01-17

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 123674, 123703, F01N 320

Patent

active

053816579

ABSTRACT:
A catalyst deterioration-detecting system is provided for an internal combustion engine having an oxygen concentration sensor arranged in an exhaust system downstream of a catalyst provided therein. An electronic control unit (ECU) controls the air-fuel ratio of a mixture supplied to the engine in response to an output from the oxygen concentration sensor. The ECU detects a value of an inversion period with which the output from the oxygen concentration sensor is inverted with respect to a predetermined reference value. Operating parameter sensors detect a value of at least one operating parameter of the engine related to a flow rate of the exhaust gases in the exhaust system. The ECU determines whether the catalyst is deteriorated, based on the detected value of the inversion period and the detected value of the at least one operating parameter. The ECU corrects the value of the inversion period in dependence on the detected value of the at least one operating parameter.

REFERENCES:
patent: 5154055 (1992-10-01), Nakane
patent: 5220788 (1993-06-01), Kurita
patent: 5227975 (1993-07-01), Nakaniwa
patent: 5280707 (1994-01-01), Nakashima

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