Diagnostic process for an exhaust gas sensor

Details Diagnostic process for an exhaust gas sensor Diagnostic process for an exhaust gas sensor

1996-08-19

1998-05-05

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Gas or liquid analyzer

F02B 7708

Patent

active

057476683

ABSTRACT:
A process for monitoring the functioning of an exhaust gas sensor disposed in a mixture-regulating circuit of an internal combustion engine includes outputting either a rich voltage representing a rich mixture composition or a lean voltage representing a lean mixture composition as a function of a composition of a mixture to be supplied to the engine, and using a behavior of the voltages during engine operation as a criterion for evaluating the functioning of the exhaust gas sensor. The temperature of an exhaust gas sensor is ascertained and compared with a temperature threshold value. If the temperature threshold value is exceeded, monitoring is performed to determine if that status is maintained for a predetermined period of time or number of cycles. A value occurring for a rich voltage or a lean voltage is detected and compared with a diagnostic value if the conditions are met. It is concluded that the exhaust gas sensor is superannuated, if the diagnostic threshold is not attained.

REFERENCES:
patent: 5357791 (1994-10-01), Gee et al.
patent: 5488858 (1996-02-01), Achleitner
patent: 5526798 (1996-06-01), Seki

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