| 摘要 |
PROBLEM TO BE SOLVED: To supply necessary and sufficient quantity of operating oil to such hydraulic pressure needed parts as transmission, and properly control circulating oil flow rate to an oil cooler depending on the oil temperature. SOLUTION: The operating oil is supplied to such designated hydraulic pressure needed parts as CVT(Continuously Variable Transmission) based on a line hydraulic pressure PL regulated by a primary regulator valve 108, and surplus portion of it drains to an oil path 112 and then is supplied to each lubrication part or an oil cooler 114. Since flow cross-sectional area of a flow cross-sectional area change means 128 and driving current IPM of electric motor 98, as driving force of an oil pump 100 are controlled, and then the operating oil circulating flow rate to the oil cooler 114 changes over, depending on their operating oil temperature THCVT, the operating oil is supplied over to such hydraulic pressure needed parts as CVT necessary and sufficient quantity and keeps preferably temperature THCVT at the designated value; consequently the energy consumption at the oil pump 100 and the total fuel consumption are saved. |
