| 摘要 |
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.
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