Patent ID: 8267233

Claim:
A hydraulic system for controlling a double-clutch transmission operating with wet clutches, said hydraulic system comprising: a primary pump for providing from a hydraulic fluid supply a system pressure in a supply line connected with a charging valve; a control valve connected with the charging valve for applying to individual clutch actuators an actuating pressure derived from the system pressure and modulated in accordance with operating conditions; wherein the charging valve includes an outlet connected with an unpressurized return line for directing hydraulic fluid delivered by the primary pump into the return line when the system pressure is reached; and a cooling control valve operatively connected with the charging valve by the return line for controlling a quantity of hydraulic fluid for cooling the clutches, wherein the cooling control valve includes an inlet connected with the return line and includes at an output a line that connects with a clutch cooling device and a recirculation line that leads to the hydraulic fluid supply, wherein hydraulic fluid flowing from the charging valve through the return line passes through the cooling control valve and is selectively delivered by the cooling control valve to the clutches to cool them or to the hydraulic fluid supply.