| 摘要 |
A fault diagnosis method for an intake air temperature sensor of a vehicle is provided to achieve improved reliability of fault diagnosis by diagnosing stuck of the intake air temperature sensor in accordance with the flow rate of intake air flowing into an engine and vehicle speed. A fault diagnosis method for an intake air temperature sensor of a vehicle, comprises a step(101) of setting a condition for diagnosing sticking of the intake air temperature sensor on the basis of the battery voltage, engine stall time, coolant temperature and vehicle speed; a step(103) of comparing the vehicle speed and intake air flow rate with a preset value; a step(105,107,109,111) of determining whether it is a high speed travel or a low speed travel on the basis of the vehicle speed and intake air flow rate, integrating the intake air temperature value with respect to time, storing integrated values, and checking whether a first predetermined time or a second predetermined time has lapsed; a step(113) of calculating the difference between the maximum value and the minimum value of the stored integral values if the first or second predetermined time has lapsed, and comparing the calculated value and a value which is preset in accordance with the condition of the intake air temperature sensor; and a step(117,119) of determining sticking of the intake air temperature sensor in accordance with the result of the comparison, and performing a limp home logic. |
