FAILURE DIAGNOSING DEVICE FOR O2 SENSOR

Japanese Patent JP3619199

B2

PROBLEM TO BE SOLVED: To provide a failure diagnosing device for an O2 sensor, allowing failure diagnosis of the O2 sensor without operating an engine.
SOLUTION: The failure diagnosing device comprises the O2 sensor 1, a heater driving means 7 for driving a heater to heat the O2 sensor, and a diagnosing means 2 for controlling the heater driving means 7 to heat the heater and, after heating for a predetermined time, for performing failure diagnosis of the O2 sensor based on the determination of the activity of the O2 sensor 1 in accordance with the output of the O2 sensor 1. The diagnosing means 2 has a heater control means 4 for controlling the heater driving means 7, a time measuring means 5 for measuring a time for energizing the heater and a time to be used for determining the abnormality of the sensor, an activity determining means 3 for determining transition from a lean condition to a rich condition of an air-fuel ratio or from the rich condition to the lean condition in accordance with the output of the O2 sensor, and a failure determining means 6 for determining the abnormality of the sensor in accordance with the outputs of the time measuring means 5 and the activity determining means 3.

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Tadayuki Saga

JP2002033979A

February 09, 2005

February 12, 2002

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Mitsubishi Electric Corporation

F02D45/00; F02D41/14; F02D41/22; G01N27/26; (IPC1-7): F02D45/00; F02D41/22; G01N27/26

JP4148038A
JP5099044A
JP6330803A
JP1163440A

Michiteru Soga
Michiharu Soga
Yutaka Ikeya
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order
Taizo Shiraishi

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