DRIVE MODE SELECTION SYSTEM FOR TRANSMISSIONS

摘要

Transmission operation selector system in which a selector valve is moved to predetermined control positions by the force of line pressure acting on a differential area of the selector valve and the opposing force of a signal pressure in a control chamber at one end of the valve. Signal pressure is controlled by solenoid operated valves operatively connected to a selector switch controlled by the vehicle operator. A line feed valve which controls the supply of operating fluid to the selector valve is controlled by a solenoid operated valve and cooperating pressure switches to cut off the feed of the fluid to the selector valve to prevent vehicle motion other than that selected when any one solenoid has failed.