| 摘要 |
PURPOSE: A control pressure stabilization system is provided to improve shift quality by stabilizing control pressure of an end clutch in shifting from the 4-range to the 2-range regardless of load of an end clutch assembly and the duty control range. CONSTITUTION: A hydraulic control system forms the passage by supplying line pressure from a manual valve(1) to a shift control unit(3), a pressure control unit(5) and a hydraulic distributing unit(7), and controls frictional factors by supplying or discharging control pressure. A control switch valve(33) is installed in a passage discharging pressure to an end clutch, and an end clutch valve is controlled with the control switch valve. A control pressure stabilization unit of the end clutch controls hydraulic pressure of the pipe according to turning on and off a solenoid valve, prevents delay of end clutch control pressure in shifting from the 2-range to the 3-range and delay of end clutch release pressure discharge in shifting from the 3-range to the 2-range, and stabilizes control pressure of the end clutch in shifting from the 4-range to the 2-range. Shift quality is improved with controlling hydraulic pressure supplied to the end clutch.
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