Patent ID: 7510501

Claim:
A hydraulic control system of a belt-type continuously variable transmission for a vehicle in which a belt is wound between a primary pulley to which power from an engine controlled by an engine controller is inputted and a secondary pulley of an output side, and a transmission controller calculates a target primary pulley pressure acting on the primary pulley and a target secondary pulley pressure acting on the secondary pulley so that an actual gear ratio of these pulleys which is obtained on the basis of a rotation speed of the primary pulley detected by a primary pulley side rotation detecting section and a rotation speed of the secondary pulley detected by a secondary pulley side rotation detecting section becomes a target gear ratio, wherein when the actual gear ratio is increased to a predetermined gear ratio or higher, the transmission controller commands reduction of an output torque of the engine to the engine controller and controls the target secondary pulley pressure to a value corresponding to the output torque of the engine after a predetermined time elapses from the command of the reduction of the output torque of the engine.