Pressure Control Valves
The pressure control valves translate an electrical current into a proportional hydraulic pressure. They are controlled by the EGS control unit and operate the valves associated with the shift elements. They are controlled by a PWM signal (300Hz at 0.1A to 1A).
There are six pressure control valves in the electrohydraulic selector unit. Valves (8, 9, 11, 12) use fluid pressure to control the 3 drive clutches and both brake clutches.
Valve (2) switches the converter lockup clutch.
Valve (3) regulates the oil pressure in the transmission as a function of the throttle-valve-position and engine torque.
The pressure control valves are used to make gear overlap and adaptive pressure control of each clutch possible.