Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Patent
1996-06-06
1998-10-06
Nguyen, Tan Q.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
701107, 123672, 123688, F02D 4134, G01M 1500
Patent
active
058191950
ABSTRACT:
A device is provided for detecting a malfunction of an air fuel ratio sensor disposed downstream of a catalytic converter in an exhaust passage of an engine. The device calculates a differential value of a sensor output with respect to time. Then the device compare the differential value of said sensor output with a predetermined value and calculate a frequency of the differential value of the sensor output which exceeds the predetermined value. Then the device compares the frequency with a predetermined value and determine that the sensor is malfunctioning if the frequency does not exceed the predetermined value.
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Nguyen Tan Q.
Toyota Jidosha & Kabushiki Kaisha
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