Catalyst deterioration-detecting system for internal combustion

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

1995-09-25

1998-02-03

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

057131970

ABSTRACT:
There is provided a catalyst deterioration-detecting system for an internal combustion engine having at least one catalyst arranged in the exhaust passage, for purifying noxious components present in exhaust gases emitted from the engine, and an exhaust gas component concentration sensor arranged in the exhaust passage at a location downstream of the catalyst, for detecting concentration of a specific component in the exhaust gases. An ECU of the system controls the ignition timing of the engine, and detects the degree of deterioration of the catalyst, based on an output value from the exhaust gas component concentration sensor. The ignition timing of the engine is retarded in dependence on the detected degree of deterioration of the catalyst.

REFERENCES:
patent: 5201173 (1993-04-01), Fujimoto
patent: 5390491 (1995-02-01), Suzumura

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