Patent ID: 7723938

Claim:
An apparatus for controlling torque of a rotary shaft of a first rotary electric machine mechanically coupled with both a rotary shaft of a second rotary electric machine and a rotary shaft of an internal combustion engine via a torque-splitting mechanism splitting torque from the internal combustion engine to the first and second rotary electric machines, the first rotary electric machine being composed as a multiphase rotary electric machine, the apparatus comprising: an inverter used to control the torque of the rotary shaft of the first rotary electric machine; a determining component determining whether or not a condition is met, the condition being defined such that there is caused a malfunction at the inverter and the internal combustion engine is in a non-operation state; and a limiting component limiting a rotation state of the rotary shaft of the internal combustion engine, which is caused by the second electric machine and transferred via the torque-splitting mechanism from the second rotary electric machine, by operating a drive state of the first rotary electric machine, when it is determined by the determining component that the condition is met.