DCT Device of hydraulic circuit in wet DCT using assistant motor-driven pump

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet-type DCT hydraulic circuit device to which an auxiliary electric pump is applied, and more particularly, to an auxiliary electric pump to increase the amount of lubricant in a clutch during creep oscillation and idle stop & (DCT) hydraulic circuit device employing an auxiliary electric pump capable of reducing the control flow required in the system by utilizing the low-pressure drain flow rate of the regulator valve for the amount of lubricating oil. will be. The present invention relates to a wet-type DCT hydraulic circuit device connected to a power shaft of an engine and to which an auxiliary electric pump is applied, comprising: a normally-driven mechanical pump for supplying a stable flow rate in an off-axis type; An auxiliary electric pump for supplying a clutch hydraulic pressure required for the ISG function and supplying the clutch lubricating oil amount; A regulator valve which is a line pressure control spool valve for generating a system pressure according to the circuit device; A pressure control solenoid valve (PPV) for the system pressure control having an internal feedback (F / back) flow path for high pressure and low leak; A PPV for valve clutch control for controlling a pressure for controlling the clutch; A system variable force solenoid valve as a linear solenoid valve for pressure control for variably controlling a control pressure of a regulator valve for controlling the line pressure; A line pressure relief C / Ball for reducing the line pressure; A check valve (CHECK VALE-ISG) for switching the pressure flow rate of the auxiliary electric pump side to the K1 clutch when the ISG is operated after the engine off (engine off); A pressure reducing valve for relieving the fluctuation of the hydraulic pressure in the pressure reducing passage of the reducing valve; A residual pressure valve for increasing a control reaction speed of the residual pressure in the clutch control flow path; A clutch having a clutch-controlled anti-shake function; A lubricating reduction valve (LRV1) for controlling the lubricating oil amount and lubricating pressure of the clutch; A secondary regulating valve (LRV2) for controlling the lubricating pressure and flow on the shaft side; The K1 and K2 wet multi-plate clutches; And a check ball for preventing inflow of air so as not to affect the suction of the main pump when the auxiliary electric pump is driven and not driven.