System for diagnosing deterioration of catalyst

Details System for diagnosing deterioration of catalyst System for diagnosing deterioration of catalyst

1996-06-14

1997-07-22

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 731181, F01N 320

Patent

active

056494203

ABSTRACT:
A diagnostic system in which the accuracy of the diagnosis of the deterioration state of a catalyst in a catalytic converter for cleaning the exhaust gas of an internal combustion engine is enhanced without incurring a rise in cost. The temperature of the catalyst is estimated using the operating-state signal (for example, the flow rate of intake air or the width of a fuel injection pulse) of the engine by a diagnostic device. The conversion efficiency of the catalyst calculated from the outputs of oxygen sensors is corrected using the estimated temperature by the diagnostic device. The deterioration state of the catalyst is diagnosed on the basis of the corrected temperature by the diagnostic device.

REFERENCES:
patent: 4656829 (1987-04-01), Creps
patent: 5158063 (1992-10-01), Hosoda
patent: 5280707 (1994-01-01), Nakashima
patent: 5325664 (1994-07-01), Seki

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