Automatic transmission control system acting on hydraulic servo

摘要

The torque exerted by the engine is transmitted by a fluid clutch to the transmission in which a clutch is engaged by the hydraulic servo (C-1) when forward gear is selected. The pressure of hydraulic fluid is adjusted by a control unit including a manual valve for establishing forward-gear pressure in a first line (L-14), a control valve (67) for regulating the pressure in a second line (L-15), and a changeover valve (64) for selective application of either of these two pressures to a third line (L-17) subject to a bypass (L-26) with a one-way valve (72).