| 摘要 |
PROBLEM TO BE SOLVED: To suppress slippage in a transmission element of a stepless transmission and improve fuel economy.SOLUTION: Pressure losses Pmagari1(i), Pmagari2(i) at a bent point i in a hydraulic passage inside a hydraulic pressure control circuit before and after a gear shift, the losses calculated using a form of the bent point i are converted into an equivalent to each load map(Ne1, Plmagari1(i)), map(Ne2,Plmagari2(i)) of an oil pump, and then a difference among each load is calculated for each bent point i and are summed up. This processing makes it possible to calculate total load variation TPLmagari in the oil pump during a gear shift. It is possible to calculate CVT input torque highly accurately using the total load variation TPLmagari that is produced by substituting with the pressure loss at the bent point i in the hydraulic passage during a gear shift. Therefore, it is possible to suppress or prevent slippage in a transmission belt of the stepless transmission and improve the fuel economy of a vehicle.SELECTED DRAWING: Figure 6 |
