Patent ID: 7637836

Claim:
A power transmission system, comprising: a first power transmitting section capable of transmitting power from an engine to a load via a speed variator while changing speed; a second power transmitting section capable of transmitting power from the engine to the load via a gearing mechanism provided in parallel to the speed variator; a prime mover that generates torque which can be controlled; and a control unit that controls torque of the prime mover; wherein the gearing mechanism is a mechanism capable of performing a torque combining operation in which torque from the engine and torque from the prime mover are combined in a state such that their torque ratio equals a first predetermined ratio, and the combined torque is transmitted to the load; and when power transmission between the engine and the load is performed via both the speed variator and the gearing mechanism, the control unit performs power distribution control for controlling distribution of power conveyed to the speed variator and power conveyed to the gearing mechanism by adjusting torque of the prime mover.