Patent ID: 8308593

Claim:
A drive system of a hybrid vehicle, including an engine, a first electric motor, a second electric motor operatively connected to a drive wheel of the hybrid vehicle, and two planetary gear mechanisms, wherein said two planetary gear mechanisms have at least four rotary elements arranged to permit the drive system to be placed in a selected one of a first operation mode in which a rotary element of the four rotary elements, connected to said drive wheel and said second electric motor is rotated at a speed intermediate between a rotating speed of a rotary element of the four rotary elements, connected to said engine and a rotating speed of a rotary element of the four rotary elements, connected to said first electric motor, and a second operation mode in which the rotary element of the four rotary elements, connected to said engine is rotated at a speed intermediate between the rotating speed of the rotary element of the four rotary elements, connected to said first electric motor and a rotating speed of the rotary element of the four rotary elements, connected to said drive wheel and said second electric motor.