Air-fuel ratio sensor trouble detecting apparatus

Details Air-fuel ratio sensor trouble detecting apparatus Air-fuel ratio sensor trouble detecting apparatus

1994-05-31

1995-05-23

Williams, Hezron E.

Measuring and testing

Gas analysis

Gas of combustion

60276, 60285, F02M 5100, F02B 7510, G01N 2726

Patent

active

054170990

ABSTRACT:
An air-fuel ratio sensor malfunction detecting apparatus detects the output signal periods of a first or upstream air-fuel ratio sensor, and compares them with a predetermined value to judge the first sensor to be malfunctioning when the periods are larger than the predetermined value. The apparatus also compares the magnitudes of air-fuel ratio control quantities from a second or downstream air-fuel ratio sensor with a predetermined value to judge the first sensor to be malfunctioning when the air-fuel ratio control quantities are larger than the predetermined value.

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patent: 4753203 (1988-06-01), Yamada
patent: 5052361 (1991-10-01), Ono et al.
patent: 5181499 (1993-01-01), Kayanuma
patent: 5249453 (1993-10-01), Usami et al.

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