Measuring and testing – Gas analysis – Gas of combustion
Patent
1995-06-28
1997-08-12
Dombroske, George M.
Measuring and testing
Gas analysis
Gas of combustion
731182, 60276, F01N 320
Patent
active
056567650
ABSTRACT:
An automotive internal combustion engine air/fuel ratio control system is diagnosed by monitoring the oxygen content of catalytically treated engine exhaust gas for sustained deviations into regions of saturation in which the catalytic treatment device is characterized by low treatment efficiency. The oxygen content of catalytically treated engine exhaust gas is periodically sampled under test conditions and the samples processed into representative values for comparison to a predetermined range. Persistent excursions outside the range indicate a fault condition in which the air/fuel ratio control system operation is not supportive of efficient exhaust gas aftertreatment.
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U.S. application No. 08/377,703, Theis filed Nov. 14, 1994.
Bridges Michael J.
Dombroske George M.
General Motors Corporation
McCall Eric S.
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