Patent ID: 6723014
Filing Date: 2004-04-20
Classification: B60K,B60W,F16H,Y10S,Y10T

Abstract:
A control device of a continuously variable transmission in a vehicle, which control device comprises: a transmission mechanism comprising a primary pulley and a secondary pulley provided with a first cylinder chamber and a second cylinder chamber, with groove widths being changed by supply of hydraulic pressure respectively, and a belt provided between said primary pulley and said secondary pulley; a hydraulic pump being driven by an electric motor to supply hydraulic pressure; line pressure control means for regulating hydraulic pressure from said hydraulic pump to predetermined line pressure and continuously supplying said line pressure to said second cylinder chamber; a shift control valve being driven by an actuator to supply hydraulic pressure, whose original pressure is line pressure, to said first cylinder chamber; and shift control means for outputting a shift command for controlling said actuator according to a driving state, said control device of the continuously variable transmission comprising:failure information holding means for holding failure information concerning a failure of said electric motor; and wherein if, at start of driving, said failure information holding means holds failure information indicating that said electric motor failed in previous driving, said shift control means outputs a shift command targeting a high range ratio for a predetermined period of time before the start of driving to thereby fill said first cylinder chamber of said primary pulley with hydraulic pressure, and starts outputting a shift command targeting a normal gear ratio according to the driving state after a predetermined vehicle speed is reached after the start of driving.