| 摘要 |
A control device for a vehicular drive system including continuously-variable transmission portion 11 and step-variable transmission portion 20, wherein an emergency transmission control device is operated when one of the continuously-variable transmission portion 11 and step-variable transmission portion 20 fails to be normally operable, to change speed ratio of the other transmission portion such that overall speed ratio gammaT of the transmission mechanism 10 determined by the speed ratio gamma 0 of the continuously-variable transmission portion 11 and speed ratio gamma of the step-variable transmission portion 20 is made equal to a value immediate before the above-indicated one transmission portion fails to be normally operable, so that a change of the overall speed ratio DeltaT is reduced, whereby the vehicle can be run with high drivability.
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