| 摘要 |
PROBLEM TO BE SOLVED: To improve control accuracy of an upshift valve or a downshift valve, and to improve responsiveness of transmission control while restraining unrequired supply or delivery of working fluid. SOLUTION: The upshift valve for controlling supply of the working fluid and the downshift valve for controlling delivery of the working fluid are connected to a primary pulley, and the upshift valve and the downshift valve are switched between the communication state and the shutoff state by a driving current. The upshift valve is switched from the shutoff state to the communication state while the downshift valve is maintained to be in the shutoff state, switching operation of the upshift valve is determined based on a speed ratio variation amount (mark c), and the driving current when the upshift valve is switched to be in the communication state is learned. In the same way, the downshift valve is switched to be in the communication state from the shutoff state while the upshift valve is maintained to be in the shut-off state, switching operation of the downshift valve is determined based on the speed ratio variation amount (mark c), and the driving current when the downshift valve is switched to the communication state is learned. COPYRIGHT: (C)2008,JPO&INPIT |
