System for controlling the pressure of oil in a system for a continuously variable transmission

摘要

A control system for a motor vehicle provided with a clutch and a continuously variable transmission. The transmission has a line pressure control valve having ports and a spool for controlling the line pressure of oil supplied to a cylinder of a pulley device to change the transmission ratio. When the clutch is disengaged, the line pressure is set to a minimum value sufficient for tensing a belt of the pulley device for preventing the belt from slipping when the clutch is re-engaged.