SHIFT CONTROL DEVICE FOR VEHICULAR STEPLESS TRANSMISSION

摘要

In a shift control device for a vehicular continuously variable transmission with an arrangement in which a normal shift mode is switched to an acceleration shift mode in response to an acceleration demand, a shift control is performed to prevent deterioration to running performance due to a transition to the acceleration shift mode by increased running resistance such as ascending road running or the like against a driver will. An acceleration demand determining value PAPL is set depending on a road surface gradient ¦ such that the shifting mode is more difficult to be switched to the acceleration shift mode in a larger road surface gradient ¦, than in a smaller road surface gradient ¦. Such arrangement prevents the shift mode from being switched to the acceleration shift mode during ascending road running with an increase in an accelerator operation amount PAP against the driver will. During a flat road running with a small road surface gradient ¦, the shift mode is switched to the acceleration shift mode in response to the acceleration demand by the driver, thereby obtaining an excellent acceleration feeling. Meanwhile, the above arrangement prevents degradation of the ascending performance due to an inadequate drive force resulting from the shift mode switched to the acceleration shift mode during ascending road running against the driver will.