| 摘要 |
PURPOSE: A variable control device of line pressure for an automatic transmission is provided to minimize driving loss, and to increase fuel efficiency by reducing the part among driving force for operating an oil pump with adjusting line pressure from the oil pump according to vehicle speed and the opening degree of a throttle valve. CONSTITUTION: A variable control device of line pressure for an automatic transmission comprises a regulator valve(14) receiving oil from an oil pump(12) and regulating pressure, and a proportional control solenoid valve(52) controlled by a transmission control unit to variably regulate line pressure from the regulator valve according to driving condition and output the variable signal pressure. The proportional control solenoid valve has a line pressure applying pipe branching from a main pipe supplying line pressure from the regulator valve, and a signal pressure applying pipe supplying signal pressure to a reaction force chamber. An auxiliary pipe is installed in the signal pressure applying pipe to stabilize signal pressure by returning control pressure to the proportional control solenoid valve, and an orifice is installed in the auxiliary pipe to prevent vibration to the signal pressure supplied to the reaction force chamber.
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