Patent ID: 6672981
Filing Date: 2004-01-06
Classification: F16H

Abstract:
A shift control apparatus for controlling a continuously variable transmission device including a continuously variable transmission mechanism having rotary elements and operable to transmit a rotary motion of a drive power source of an automotive vehicle to a drive wheel of the automotive vehicle, such that a speed ratio of said mechanism is continuously variable, comprising:power-transmitting-state determining means for determining whether said continuously variable transmission mechanism is placed in a non-power-transmitting state in which said mechanism is not transmitting a drive force; speed-ratio determining means for determining whether said continuously variable transmission mechanism is placed in a lowest-speed position; rotation-stop detecting means for determining whether said rotary elements are at rest; and compulsory-speed-ratio-change implementing means for effecting a compulsory shift-down action of said continuously variable transmission mechanism toward said lowest-speed position if said power-transmitting-state determining means has determined that said continuously variable transmission mechanism is placed in said non-power-transmitting state, if said speed-ratio determining means has determined that said continuously variable transmission mechanism is not placed in said lowest-speed position and if said rotation-stop detecting means has determined that said rotary elements of said mechanism are at rest.