Steuervorrichtung für ein automatisches Getriebe

摘要

A shift interlock mechanism for an automatic transmission includes electro-hydraulic elements (40,42) internal to the transmission which are operable to inhibit the supply of fluid pressure for engaging the forward and reverse speed ranges of the transmission. The electro-hydraulic elements are activated in response to various operating parameters of the vehicle, including range selector position, engine throttle position, depression of the service brake pedal, vehicle speed, etc. The mechanism does not interfere with movement of the transmission range selector, and includes a mechanical link (90) for overriding the interlock function when the range selector is moved to a LO forward range, thereby providing an override in the event of a failure of the electro-hydraulic elements.