LINE PRESSURE CONTROLLER FOR V-BELT TYPE CONTINUOUSLY VARIABLE TRANSMISSION

摘要

PURPOSE:To prevent slippage of a V-belt and to improve the durability of V-belt, by temporarily increasing the line pressure with respect to a referential level being determined on the basis of such as an engine load when selecting operation for transferring the speed change ratio to low side is performed. CONSTITUTION:A continuously variable transmission comprises a drive pulley having an effective diameter variable with the hydraulic pressure and a driven pulley entrained with a V-belt where speed change control is performed by varying the hydraulic pressure functioning onto the drive pulley. The line pressure is controlled by a line pressure control means C such that it will increase as the engine load detected by an engine load detecting means A and the speed change ratio detected by a speed change detecting means B increase. When the select steering for transferring the speed change ratio to low side is performed by a select operation means D, the line pressure is controlled to exceed over a referential level being determined on the basis of the engine load and the speed change ratio for a predetermined time by a temporal line pressure increasing means E.