Systems and methods are provided for processing and extracting content from an image of a driver’s license captured using a mobile device. A fan is positioned in one of the holes for drawing air into the chest, where heat is exchanged with the contents of the chest, and the other hole is a vent, through which the conditioned air exits. idling-time\u2032 target phase setting unit sets the target phase so that a range, in which the valve phase is allowed to change, is restricted within a phase region where a speed reduction ratio is high and the operating noise is relatively low.