Deterioration diagnosis system for exhaust gas sensor

Details Deterioration diagnosis system for exhaust gas sensor Deterioration diagnosis system for exhaust gas sensor

2008-06-17

2008-06-17

Solis, Erick (Department: 3747)

Measuring and testing

Gas analysis

Gas of combustion

C073S031050, C073S117020, C123S688000, C123S690000

Reexamination Certificate

active

07387011

ABSTRACT:
A diagnosis device calculates a lean-direction responsiveness characteristic and a rich-direction responsiveness characteristic of the exhaust gas sensor. The lean-direction responsiveness represents a responsiveness of the sensor in a case that an air-fuel ratio is controlled in such a manner as to be varied in a lean direction. The rich-direction responsiveness represents a responsiveness of the sensor in a case that the air-fuel ratio is controlled in such a manner as to be varied in a rich direction. The diagnosis device determines whether the exhaust gas sensor deteriorates based on at least one of the lean-direction responsiveness characteristic and the rich-direction responsiveness characteristic, and on a comparison result between the lean-direction responsiveness characteristic and the rich-direction responsiveness characteristic.

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