| 摘要 |
Upon shifting control of differential mechanism 10, speed ratio gamma0 of continuously-variable transmission portion 11 and speed ratio gamma of automatic transmission portion 20 are determined by vehicle-output control device 82 on the basis of target engine output PE* and vehicle speed V, so as to establish an operating point of engine 8 which provides the target engine output PE* and which follows an optimum-fuel-economy curve, and the shifting control of the continuously-variable transmission portion 11 and the shifting control of the automatic transmission portion 20 are effected substantially concurrently, so that engine speed NE continuously changes, and the differential mechanism 10 is shifted with a reduced shifting shock. Further, the speed ratio gamma0 of the continuously-variable transmission portion 11, in other words, the engine speed NE is changed by using first electric motor M1 and/or second electric motor M2, permitting an improvement in shifting response of the differential mechanism 10.
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