Vorrichtung und Verfahren zur Ausfallsicherungssteuerung für elektronisch gesteuerte, automatische Getriebe

摘要

In a fail-safe control device for an electronically controlled automatic transmission to be mounted on a vehicle, the oil temperature in the transmission is detected by an oil temperature sensor provided for the transmission, and if the oil temperature in the transmission exceeds an allowable level with the lockup operation always prohibited, the gear shift to the maximum gear stage is prohibited. As a result of this, slippage generated in the torque converter can be reduced and the oil temperature in the T/M can be lowered so that a fail-safe control can be performed.