TRANSMISSION CONTROL DEVICE FOR CONTINUOUSLY VARIABLE TRANSMISSION

摘要

First control unit performing first pseudo stepwise up-shift control that, in first travelling mode, increases vehicle speed while performing hold of transmission ratio and up-shift by first shifting speed and reduces engine torque upon up-shift, second control unit performing second pseudo stepwise up-shift control that, in second travelling mode, increases vehicle speed while performing hold of transmission ratio and up-shift by second shifting speed and reduces engine torque upon up-shift, and third control unit controlling change of travelling mode and switch between two pseudo stepwise up-shift controls according to control states of first and second control units, are provided. When travelling mode is changed to second travelling mode during progress of up-shift in first pseudo stepwise up-shift control, third control unit maintains first pseudo stepwise up-shift control until up-shift is completed. With this, harmonization between pseudo stepwise up-shift control and engine torque control is secured, then shift shock is suppressed.

主权项

1. A transmission control device for a continuously variable transmission, which continuously varies a rotation speed of an engine mounted in a vehicle having a plurality of travelling modes and outputs the rotation speed, the transmission control device comprising:
a mode changing unit operated by a driver and changing the travelling mode; a first control unit performing a first pseudo stepwise up-shift control that when the travelling mode is a first travelling mode and a first predetermined condition is satisfied, increases a vehicle speed while repeating hold of a transmission ratio and up-shift by a first shifting speed, and reduces a torque of the engine by an amount of an inertia torque generated during the up-shift by the first shifting speed; a second control unit performing a second pseudo stepwise up-shift control that when the travelling mode is a second travelling mode and a second predetermined condition is satisfied, increases the vehicle speed while repeating hold of the transmission ratio and up-shift by a second shifting speed that is faster than the first shifting speed, and reduces the torque of the engine by an amount of an inertia torque generated during the up-shift by the second shifting speed; and a third control unit controlling change of the travelling mode by the mode changing unit and controlling switch between the first pseudo stepwise up-shift control and the second pseudo stepwise up-shift control according to control states of the first control unit and the second control unit, and the third control unit being configured to, when the travelling mode is changed from the first travelling mode to the second travelling mode by the mode changing unit during a progress of the up-shift in the first pseudo stepwise up-shift control by the first control unit, maintain the first pseudo stepwise up-shift control by the first control unit until the up-shift is completed.