| 摘要 |
PURPOSE:To properly control a line pressure at the time of idle operation at a high temperature. CONSTITUTION:Based on a signal of a throttle valve opening, a line pressure solenoid valve 33 in a drain circuit 32 of pilot pressure from a pilot valve 31 is duty-controlled by a control unit to govern a throttle pressure, and this throttle pressure serves as a signal pressure to control a pressure regulator valve 35 through a pressure modifier valve 34 and to govern a pressure of operating oil, delivered from an oil pump 36, to an optimum line pressure. Here at the time of idle operation by oil at a high temperature, the line pressure solenoid valve 33 is controlled in fully closing with no electrification to increase the line pressure by increasing the throttle pressure. |
