Steuerventilsystem für ein mehrgängiges Automatikgetriebe

摘要

A control valve system for a multiple ratio transmission with a high ratio clutch (C2) and an intermediate ratio brake servo (B2) including a first solenoid operated valve (VFS1) that generates a control pressure for intermediate servo apply and a second solenoid operated valve (VFS3) that generates a control pressure for intermediate servo release and for the high clutch. The second and the first solenoid valves control the intermediate servo stroke phase and the second solenoid valve controls, either closed or open loop, the deceleration of a high clutch drum. Pressures electronically controlled by the solenoid valves are distributed to the clutch and brake servo pressure chambers by a shift valve configuration, whereby high quality upshifts and downshifts are achieved.