Patent ID: 8849524
Filing Date: 2014-09-30
Classification: F16H,Y10T

Abstract:
1. A vehicular shift control apparatus configured to control a speed ratio of a belt-type transmission having a first variable-diameter pulley disposed on the side of a drive power source of a vehicle, a second variable-diameter pulley disposed on the side of drive wheels of the vehicle, and a transmission belt wound between the first and second variable-diameter pulleys, by controlling hydraulic pressures to be applied to respective hydraulic cylinders of said first and second variable-diameter pulleys, according to respective commanded hydraulic pressure values of the first and second variable-diameter pulleys, such that the speed ratio coincides with a target value, the vehicular shift control apparatus comprising: a shift control portion configured to be operable, when a first-variable-diameter-pulley hold pressure which permits the speed ratio of said belt-type transmission to be held at the target value in a shift-down action of said belt-type transmission is determined as said commanded hydraulic pressure value of the first variable-diameter pulley, to temporarily reduce said commanded hydraulic pressure value with respect to said first-variable-diameter-pulley hold pressure in an initial period of said shift-down action, wherein said shift control portion is configured to be operable to temporarily reduce said commanded hydraulic pressure value of the first variable-diameter pulley with respect to said first-variable-diameter-pulley hold pressure in the initial period of said shift-down action, such that an amount of reduction of said commanded hydraulic pressure value of the first variable-diameter pulley with respect to said first-variable-diameter-pulley hold pressure increases with an increase of a target value of a shifting speed which is a rate of change of said speed ratio.