Automotive vehicle catalyst diagnostic

Details Automotive vehicle catalyst diagnostic Automotive vehicle catalyst diagnostic

1994-11-14

1996-04-23

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60285, F01N 320

Patent

active

055092675

ABSTRACT:
A catalytic treatment device diagnostic for an automotive exhaust system having at least two catalytic treatment devices wherein reduced oxygen storage capacity of each of the devices may be diagnosed without significant loss in engine air/fuel ratio control precision by varying the source of an actual air/fuel ratio feedback signal from a sensor positioned upstream of the devices during normal operation to a sensor mounted downstream of at least one of the devices during a diagnostic period. Measurable change in the oxygen content of exhaust gas passing through each of such devices then becomes available for analysis during the diagnostic period.

REFERENCES:
patent: 5099647 (1992-03-01), Hamburg
patent: 5127225 (1992-07-01), Nada
patent: 5159810 (1992-11-01), Grutter
patent: 5426934 (1995-06-01), Hunt

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