CONTROL DEVICE, VEHICLE SYSTEM, AND CONTROL METHOD

The invention provides a control device, a vehicle system, and a control method capable of improving power consumption. The control device is provided with a data acquisition part that acquires torquedata indicating the drive torque of an electric motor, rotational speed data indicating the rotational speed of the electric motor, and DC voltage data indicating the DC voltage supplied to a converter that supplies AC current to the electric motor; a determination reference derivation part for deriving a determination reference based on the drive efficiency of the motor using the torque data, the rotational speed data, and the DC voltage data; and a control mode determination part that determines, on the basis of the determination reference, which control mode of the converter is one of monopulse control and pulse width modulation control. 本发明提供能够改善电耗的控制装置、车辆系统及控制方法。控制装置具备：数据取得部，其取得表示电动机的驱动转矩的转矩数据、表示所述电动机的转速的转速数据及表示对向所述电动机供给交流电流的转换器供给的直流电压的直流电压数据；判定基准导出部，其使用所述转矩数据、所述转速数据及直流电压数据来导出基于所述电动机的驱动效率的判定基准；以及控制方式决定部，其基于所