Catalytic converter diagnostic

Details Catalytic converter diagnostic Catalytic converter diagnostic

1993-12-14

1995-07-11

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 731181, F01N 320

Patent

active

054310113

ABSTRACT:
A diagnostic for an internal combustion engine exhaust gas treatment means includes a series of enabling conditions for modelling temperature and operational stability of the treatment means and includes first and second stage tests alternately applied on an engine air/fuel ratio cycle-by-cycle basis in accord with the diagnosed performance of the treatment means using post-converter oxygen sensor information. When the treatment means performance is diagnosed as being degraded close to a failed condition, the first stage is disabled and the more statistically rigorous second stage is activated to closely scrutinize converter performance using a two phase approach for false alarm protection.

REFERENCES:
patent: 5255515 (1993-10-01), Blumenstock
SAE Paper 900062-Detection of Catalyst Performance Loss Using On-Board Diagnostics-Clemmens et al-Feb 26-Mar. 2, 1990.
SAE Paper 910561-Detection of Catalyst Failure On-Vehicle Using The Dual Oxygen Sensor Method-Koupal et al-Feb. 25-Mar. 1, 1991.

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