Patent ID: 9545842
Date: 2017-01-17
CPC Classifications: B60K,B60W,F16H,Y02T,Y10S,Y10T

Claim:
1. A power transmission apparatus for a vehicle comprising: an electric rotating machine working as a power source; a power split device which includes a first, a second, and a third rotor which rotate in conjunction with each other to split power among the first, second, and third rotors, the third rotor being coupled mechanically to a driven wheel of a vehicle; a speed variator joined mechanically to the power split device; setting means for setting signs of power, as outputted from the first and second rotors, opposite each other to establish a power circulation mode in which the power is circulated between the first and second rotors in a power transmission mode in which power, as produced by the power source, is transmitted to the third rotor through the second rotor and then to the driven wheel; bidirectional switching means for switching rotation of the electric rotating machine between opposite directions; and a controller which controls a speed ratio of a speed rotation of an output of the power source to a speed of rotation of the driven wheel to lie within one of a positive range in which a sign of the speed ratio is positive and a negative range in which a sign of the speed ratio is negative.