Patent ID: 7041018
Filing Date: 2006-05-09
Classification: F16H

Abstract:
1. A hydraulic control system for a belt-drive continuously variable transmission (CVT) of a vehicle, the CVT including a belt, the hydraulic control system comprising: an oil pump operative to produce an oil pressure and an oil flow amount which are supplied to the CVT; a pressure regulator valve operative to regulate the oil pressure produced by the oil pump; a belt lubricating oil supply passage for supplying oil to the belt on a downstream side of the pressure regulator valve; engine operating condition detecting means for detecting an engine operating condition and generating an engine operating condition signal, the engine operating condition detecting means including an oil temperature sensor operative to: detect a temperature of the oil in the CVT; and generate an oil temperature signal indicative of the oil temperature detected; an oil cooler disposed on a downstream side of the pressure regulator valve; a lubricating oil supply path for supplying the oil to lubrication parts in the CVT, the lubricating oil supply path being disposed on a downstream side of the oil cooler and including the belt lubricating oil supply passage; line pressure detecting means for: a controller for controlling the oil flow amount based on the engine operating condition signal, which is generated based on the oil temperature signal and the line pressure signal, the controller being programmed to: calculate a CVT input torque based on the engine operating condition signal;