MANUAL SPEED SELECTOR OF AUTOMATIC VEHICLE TRANSMISSION

摘要

A manual speed selector of an automatic vehicle transmission, having a manual valve capable of being changed over by a shift lever, and shift valves capable of being changed over by controlling a plurality of solenoid valves. Hydraulic pressure is supplied to or discharged from frictional engagement devices by the changeover of the shift valves to automatically shift the transmission. The shift lever can be moved between an automatic shift mode position and a manual shift mode position, and a transitive position is provided between these two mode positions. At the transitive posion, the manual valve is set in a position such as to enable supply of hydraulic pressure to the frictional engagement devices. At the transitive position also, the transmission can be set in neutral state. In the manual shift mode the solenoid valves can be selectively turned on or off to effect engine braking.