Hydraulic control system for motor vehicle automatic gearbox has switching valve for delivering control valve output pressures to engagement element depending on gear selected

摘要

The system has a first stage that produces a pressure in a line, a solenoid valve that generates s solenoid pressure on receiving a solenoid signal, pressure control valves that produce output pressures from the line pressure with a lesser and greater increases than the solenoid valve pressure and a switching valve for delivering an output pressure to an engagement element depending on the gear selected.