Patent ID: 7523797

Claim:
A power output apparatus that outputs power to a drive shaft, said power output apparatus comprising: an internal combustion engine; an electric power-dynamic power input-output module that transmits at least part of power from said internal combustion engine to said drive shaft through input and output of electric power and dynamic power; a motor that inputs and outputs power from and to said drive shaft; an electric accumulator that transmits electric power to and from said electric power-dynamic power input-output module and said motor; and a controller that, in response to a driver's accelerator-off action to require a braking force to be delivered to said drive shaft, sets a specific drive point of said internal combustion engine to attain output of a braking force corresponding to the required braking force-and a charge limit of said electric accumulator, specified according to a temperature and a state of charge of said electric accumulator as a maximum electric power during the charge of said electric accumulator, and controls said internal combustion engine, said electric power-dynamic power input-output module, and said motor to drive said internal combustion engine at said specific drive point and to ensure output of the braking force corresponding to the required braking force, wherein said controller sets a revolution speed calculated from a first driving force, which is transmitted to said drive shaft through input and output of power into and from said electric power-dynamic power input-output module, to a target revolution speed at the specific drive point of said internal combustion engine, where the first driving force is obtained according to a specific relation that a sum of the first driving force and a second driving force, which is output from said motor to said drive shaft, is equal to the requirement of the braking force and according to another specific relation that a sum of a first electric power input into and output from said electric power-dynamic power input-output module and a second electric power input into and output from said motor, and a potential loss, is equal to the charge limit of said electric accumulator.