Patent ID: 8479513

Claim:
A control device for controlling operations of a drive unit configured to drive a rotary motor for an electrically assisted turbocharger, the rotary motor being directly connected to a rotating shaft of the electrically assisted turbocharger disposed in intake and exhaust passages of an engine and being driven according to an operating state of the engine, the control device comprising: an internal temperature detector to detect a temperature of the drive unit; an ambient temperature detector to detect an ambient temperature in a space where the drive unit is disposed; and a control section to control drive of the rotary motor by the drive unit based on results of detections by the internal temperature detector and the ambient temperature detector, wherein (a) the control section stops the drive of the rotary motor by the drive unit while the temperature of the drive unit is equal to or above a preset upper limit internal temperature, and (b) while the temperature of the drive unit is below the upper limit internal temperature, (b1) the control section allows the drive of the rotary motor by the drive unit up to 100% output while the ambient temperature in the space where the drive unit is disposed is below a preset upper limit ambient temperature, and (b2) the control section limits the drive of the rotary motor by the drive unit to an output of a predetermined percentage above 0% and below 100% while the ambient temperature is equal to or above the upper limit ambient temperature.