Diagnostic equipment for an exhaust gas cleaning apparatus

Details Diagnostic equipment for an exhaust gas cleaning apparatus Diagnostic equipment for an exhaust gas cleaning apparatus

1997-02-07

1999-07-13

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60285, 60276, F01N 300

Patent

active

059210788

ABSTRACT:
A diagnostic equipment for an exhaust gas cleaning apparatus installed for an engine, comprising a misfire detector which detects the misfire of the engine, and a secondary-air-system failure detector which detects the failure of a secondary air system. An index corrector corrects a deterioration index calculated by a deterioration-index calculator, in accordance with the detected result of the detector. A deterioration decision unit decides if the diagnostic equipment has failed, by the use of the corrected deterioration index. In a case where the extent of the misfire or the like is severe, a decision interrupter interrupts the decision of the deterioration decision unit. Thus, even when the misfire of the engine or the failure of the secondary air system has occurred, the detection of the deterioration of a catalyst does not err. It is therefore avoided to erroneously replace the catalyst which has not deteriorated yet, or to run the engine in spite of the deterioration of the catalyst.

REFERENCES:
patent: 4192140 (1980-03-01), Yamashita et al.
patent: 5119631 (1992-06-01), Kayanuma
patent: 5134847 (1992-08-01), Ogawa
patent: 5158059 (1992-10-01), Kuroda
patent: 5365216 (1994-11-01), Kotwicki et al.
patent: 5426934 (1995-06-01), Hunt et al.

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