Patent ID: 7823473
Filing Date: 2010-11-02
Classification: F16H,Y10T

Abstract:
1. An electro-hydraulic control system for a motor-vehicle dual-clutch transmission with six or seven forward gears and reverse gear, comprising a hydraulic control circuit and a gear shift control device including four shift forks, each operatively associated to a respective engagement sleeve of the transmission to cause this latter to move between first and second engagement positions through an intermediate neutral position, and an actuating unit comprising four double-acting hydraulic actuators arranged to control each the displacement of a respective shift fork, wherein the hydraulic control circuit comprises a supply unit, a distributor valve for selecting every time one of the four hydraulic actuators, a pilot solenoid valve for controlling the distributor valve, and two first solenoid valves for controlling the hydraulic actuator selected by the distributor valve, and wherein the distributor valve is a four-position distributor valve and wherein each of the positions of the distributor valve corresponds to the selection of one of the four hydraulic actuators.