| 摘要 |
A system and method are provided for diagnosing temperature sensor operation in an exhaust aftertreatment system. Temperature signals from first, second and third temperature sensors and a flow signal are received by a control circuit. The three temperature sensors are positioned in fluid communication with an exhaust flow path fluidly coupled to an exhaust manifold of an internal combustion engine, and the flow signal represents the flow rate of exhaust gas through the exhaust flow path. The control circuit determines average temperature differentials between each of the first, second and third temperature sensors as functions of the flow signal and corresponding ones of the first, second and third temperature signals, and produces a diagnostic fail signal if any of the differences between the average temperature differentials exceed a threshold value.
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