Diagnosing system and method of catalytic converter for controll

Details Diagnosing system and method of catalytic converter for controll Diagnosing system and method of catalytic converter for controll

1996-05-22

1998-06-02

Wolfe, Willis R.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 318, F01N 320

Patent

active

057584915

ABSTRACT:
A diagnosing system of a catalytic converter in an internal combustion engine has a detecting unit to detect an operating state of the engine and an air/fuel ratio control unit to adjust a fuel injection amount so as to keep an air/fuel ratio of a mixture that is inhaled into the engine to a target value. The operating state of the engine is detected, whereby it is confirmed that the engine lies in a predetermined operating region to execute a catalyst diagnosis on the basis of the detected operating state. In each of a plurality of different catalyst diagnosis regions, the performance of the catalytic converter or the performance of the catalytic converter array is diagnosed on the basis of the output signal of the first exhaust gas component sensor arranged on the upstream side of the catalytic converter array and the output signal of the second exhaust gas component sensor arranged on the downstream side.

REFERENCES:
patent: 5233829 (1993-08-01), Komatsu
patent: 5341642 (1994-08-01), Kurihara et al.
patent: 5355672 (1994-10-01), Adamczyk, Jr. et al.
patent: 5377484 (1995-01-01), Shimizu
patent: 5394691 (1995-03-01), Seki
patent: 5414994 (1995-05-01), Cullen et al.
patent: 5417058 (1995-05-01), Shimizu
patent: 5485382 (1996-01-01), Seki et al.

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