SPEED CHANGE CONTROL DEVICE FOR CONTINUOUSLY VARIABLE TRANSMISSION

PROBLEM TO BE SOLVED: To supply sufficient line pressure even if high target line pressure is established. SOLUTION: Line pressure increases in relation to secondary pressure within reference value α by controlling a pilot valve 52. Target mode pressure Pm is calculated by subtracting target secondary pressure Pst from target line pressure PLt when control signal S2 of a pilot valve 52 is calculated. Then, the target mode pressure Pm and the reference value α are compared (step S11), and control signal S2 is calculated based on target mode pressure Pm (step S12) when the target mode pressure Pm is below the reference value α. On the other hand, lower limit value Lim of secondary pressure is raised based on the target mode pressure Pm (step S13) when the target mode pressure Pm is above the reference value α. Consequently, the target mode pressure can be kept in the reference value α, and line pressure can be raised to the target line pressure PLt even if high target line pressure PLt is established. COPYRIGHT: (C)2007,JPO&INPIT