Power output apparatus and method of controlling the same

A power output apparatus for outputting power to a drive shaft, said power output apparatus comprising:

• an engine having an output shaft;
• a first motor having a rotating shaft and an inputting and outputting power to and from said rotating shaft;
• a second motor inputting and outputting power to and from said drive shaft;
• three shaft-type power input/output means having three shafts linking said engine and said drive shaft, said three shaft-type power input/output means inputting and outputting power to and from a residual one shaft, based on predetermined powers input to and output from any two shafts among said three shafts;
• storage battery means being charged with an electric power output from said first motor, being discharged to supply an electric power input to said first motor, being charged with an electric power output from said second motor, and being discharged to supply an electric power input to said second motor;
• target power setting means for setting a target power to be output to said drive shaft;
• driving state setting means for setting a driving state of said engine based on the target power set by said target power setting means;
• operation control means for controlling said engine and said first motor, in order to enable said engine to be driven in the driving state set by said driving state setting means;
• power calculation means for calculating a power input to and output from said drive shaft via said three shaft-type power input/output means that reflects inertia of the engine and the first motor, accompanied by the control of said engine and said first motor by said operation control means;
• and
• motor control means for controlling said second motor, in order to enable the target power to be output to said drive shaft based on the power calculated by said power calculation means and the target power set by said target power setting means.