Patent ID: 7766788

Claim:
A drive force output apparatus for outputting drive force to a drive shaft, comprising: a power generation system that generates power using fuel supplied to the power generation system; an electric motor that outputs drive force to the drive shaft; a power storage device that exchanges power with the power generation system and with the electric motor; an auxiliary that operates on power supplied from a power supply system including the power storage device; a required drive force setting portion that sets a required drive force at the drive shaft; and a controller that sets a control center that is a center power storage amount in a range for controlling an amount of power stored in the power storage device based on a state of operation by an operator and/or a state of the drive force output apparatus; and the controller sets a maximum auxiliary power representing an upper limit of power allowed to be consumed by the auxiliary based on the set control center; and controls the power generation system, the electric motor, and the auxiliary such that the amount of power stored in the power storage device is controlled based on the set control center, and drive force corresponding to the set required drive force is output to the drive shaft while the power consumed by the auxiliary remains equal to or smaller than the maximum auxiliary power.