FFV FFV Diagnosis Method For Ethanol Sensor Of Flexible Fuel Vehicle And FFV Operated Thereby

摘要

Disclosed are a method for diagnosing the validity of an ethanol sensor in a flexible fuel vehicle (FEV) and an FEV operated thereby. According to one embodiment of the present invention, the method for diagnosing the validity of an ethanol sensor comprises: a) a refuel detection step of detecting whether fuel is refueled into a fuel tank from a refuel detection device disposed in the fuel tank; b) a maximum variable content range calculation step of calculating the range of ethanol content in the fuel stored in the fuel tank in consideration of whether the refueled fuel is pure gasoline to whether the refueled fuel is pure ethanol; c) an ethanol sensor value acquisition step of determining whether data detected from the ethanol sensor is converted to a constant value after a calculated time elapses; d) an oxygen sensor value acquisition step of determining whether data detected from an oxygen sensor is converted to a constant value after a calculated time elapses; and e) an ethanol sensor failure determination step of determining whether an error has occurred in the ethanol sensor when the data acquired from the ethanol or oxygen sensor value acquisition step is outside a calculated range. Accordingly, whether the ethanol sensor is abnormal can be correctly diagnosed, such that the ethanol content of the fuel stored in the fuel tank can be correctly checked, thereby fundamentally preventing a problem caused by an error of the ethanol sensor.