SPEED CHANGE CONTROL DEVICE FOR VEHICULAR CONTINUOUSLY VARIABLE TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To provide a speed change control device for a vehicular continuously variable transmission capable of inhibiting overshoot of actual value when speed change ratio of the continuously variable transmission is changed to speed increase side from the maximum speed change ratio. SOLUTION: Since DS1 speed change Duty output by a speed change control means 152 for feedback control is made larger than DS1 speed change Duty (=D1) for retaining the maximum speed change ratioγmax by a determined valueΔD in a stepped manner by an operation quantity change means 166 when speed change ratioγis changed from the maximum speed change ratioγmax to the speed increase side in speed change of the continuously variable transmission 18 to achieve target input shaft rotation speed NIN*, DS1 speed change Duty can be set to a value (=D2) for starting upshift of DS1 speed change Duty and over shoot of the actual input shaft rotation speed NINcan be suppressed even if DS1 speed change Duty (=D1) before that is set to a value smaller than DS1 speed change Duty (=D2) in the maximum speed increase side capable of retaining the maximum speed change ratioγmax. COPYRIGHT: (C)2008,JPO&INPIT