ELECTRIC DEVICE CONTROL METHOD AND ELECTRIC DEVICE

An electric device control method controls an electric device that includes an internal combustion engine, a first electric motor that receives a driving force of the internal combustion engine to carry out power generation, and a second electric motor connected to a drive shaft. The method sets a rotational speed of the internal combustion engine to increase as a vehicle speed of the vehicle increases while the power generation is carried out by the first electric motor. Where the driving force required by the second electric motor becomes zero or negative while the first electric motor is carrying out power generation by the driving force of the internal combustion engine, the internal combustion engine is stopped where the vehicle speed is greater than or equal to a first threshold value, and the power generation is continued where the vehicle speed is less than the first threshold value.