Patent ID: 7354377
Filing Date: 2008-04-08
Classification: F16H,Y10T

Abstract:
1. A belt continuously variable transmission comprising: a primary pulley and a secondary pulley each having a groove whose width changes in accordance with a pressure of a working fluid supplied; a belt that is hung between the primary pulley and the secondary pulley; a hydraulic pump that discharges the working fluid; a speed ratio control valve that regulates the pressure of the working fluid from the hydraulic pump and supplies the pressure to the primary pulley and the secondary pulley; an actuator that drives the speed ratio control valve; a temperature sensor that detects a temperature of the working fluid; and a controller connected to the actuator and the hydraulic pump and input with a detection signal from the temperature sensor, wherein the controller determines that deenergization conditions are met when the temperature of the working fluid becomes greater than a first predetermined temperature while a vehicle is at rest in an idling state, and stops energization to the actuator after the deenergization conditions have been met.