Patent ID: 7556588
Filing Date: 2009-07-07
Classification: B60K,B60L,B60T,B60W,F02N,F16H,Y10T

Abstract:
1. A system for generating a line pressure of a continuously variable transmission in a hybrid vehicle, comprising: a brake for generating a hydraulic pressure by operation of a brake pedal; an oil tank for storing oil; an oil pump for pumping oil stored in the oil tank according to the hydraulic pressure generated by the brake; a hydraulic pressure supply line for supplying the hydraulic pressure from the oil pump to the transmission; a hydraulic pressure withdrawal line connected to the hydraulic pressure supply line, and having a control valve for controlling the hydraulic pressure thereof; a transmission control unit for controlling opening and closing of the control valve; and a line pressure generating unit connected to the hydraulic pressure supply line, and generating the line pressure in an idle stop state, wherein the line pressure generating unit comprises: a chamber divided into first and second portions by a diaphragm; a valve connected to the first portion of the chamber; and a plunger for generating the line pressure in accordance with a pressure difference between the first and second portions of the chamber, wherein the second portion of the chamber is connected to the brake and a pressure thereof is maintained to be the same as a negative pressure of an engine, and wherein a vacuum tank is connected between the second portion of the chamber and the brake, and a pressure of the vacuum tank is maintained to be the same as the negative pressure of the engine.