Disclosed is a failure determination method for a shift control device and an operation state detecting means of an automatic transmission for a vehicle.

摘要

The present invention is a shift control device for a vehicular automatic transmission in which a shift unit value of an automatic transmission having a plurality of shift stages is switched to an optimum shift stage set by fuzzy inference on the basis of a parameter value indicating a running state of the vehicle, The fuzzy inference is performed in such a manner that when a failure of the sensor for detecting the parameter value is detected (SI0 (SI6), the setting of the optimum gear position by the fuzzy inference is prohibited (SI3), and the optimum gear position is set by the shift control mode in which the failure sensor is not involved (SI6, SI7) A failure determination method for a shift control device and an operation state detection device is provided.