| 摘要 |
An automatic transmission control system having a fail-safe function includes an automatic transmission control unit which prestores a normal state of ON-OFF settings of engaging elements and actually detects an actual state of ON-OFF positions (engagements and disengagements) of the engaging elements. The automatic transmission control unit has a comparator capable of comparing the normal state of ON-OFF settings with the actual state of ON-OFF positions of the engaging elements, and determines that a hydraulic system failure occurs when the normal state and the actual state disagree with each other. The automatic transmission control unit has a fail-safe mode engagement-disengagement command section provided for selecting a specified gear mode based on the actual state and for outputting a command to an actuator for the engaging elements, so that the transmission is shifted to the specified gear mode which is preprogrammed to be suitable for the actual state, only when the automatic transmission control unit determines that the hydraulic system failure occurs.
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