Patent ID: 7398844

Claim:
A hybrid vehicle, comprising: a power storage device; an engine; a driving wheel; a first rotating electric machine mainly operating as a power generator; a second rotating electric machine rotating in synchronization with rotation of said driving wheel; a power split device coupled to a rotation shaft of the engine and to rotation shafts of the first and second rotating electric machines, wherein determination of rotation speed of any two rotation shafts among the three rotation shafts causes forced determination of rotation speed of residual one rotation shaft; an inverter driving said first and second rotating electric machines; an input device receiving an instruction requesting acceleration from a driver; and a controller monitoring a state of charge of the power storage device in response to the acceleration instruction, and instructing the inverter to increase contribution of the first rotating electric machine to an acceleration operation in a second state of insufficient state of charge to be larger than the contribution of the first rotating electric machine to said acceleration operation in a first state of sufficient state of charge.