Measuring and testing – Gas analysis – Gas of combustion
Patent
1995-03-24
1997-03-11
Dougherty, Elizabeth L.
Measuring and testing
Gas analysis
Gas of combustion
731173, 60277, F02D 4114
Patent
active
056103212
ABSTRACT:
A failure detection system for an air-to-fuel ratio control system executes an air-to-fuel ratio feedback control based on a first output from a first air-to-fuel ratio sensor before a catalytic converter. The system detects a feedback correction value, corrected according to a second output from a second air-to-fuel ratio sensor after the catalytic converter, which is above a predetermined value so as to determine that the first air-to-fuel ratio sensor has something wrong with it. The system also detects a change in the second output during correction of the feedback correction value so as to determine that the second air-to-fuel ratio sensor has something wrong with it when a change which is less than a predetermined change is detected.
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Dougherty Elizabeth L.
Mazda Motor Corporation
McCall Eric S.
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