Abstract: A microcomputer calculates a predicted CPU ambient temperature which predicts an ambient temperature in the future by using a heat generation amount of a drive, an outside air temperature detected by an outside air temperature sensor, and a CPU ambient temperature detected by a CPU ambient temperature sensor. The microcomputer controls a rotation number of the fan on the basis of the predicted CPU ambient temperature so that a junction temperature of a CPU does not exceed a temperature-specification upper limit value.

Abstract: When a plurality of fans in a first controller (any of controllers) become activation start objects and a plurality of fans in a second controller (a controller in a predetermined relative positional relationship with the first controller) are positively rotating, the first controller sets a level of a rotational speed of the plurality of fans in the first controller to a first level and the second controller keeps a level of a rotational speed of the plurality of fans in the second controller at a second level that is equal or higher than the first level.

Abstract: A microcomputer calculates a predicted CPU ambient temperature which predicts an ambient temperature in the future by using a heat generation amount of a drive, an outside air temperature detected by an outside air temperature sensor, and a CPU ambient temperature detected by a CPU ambient temperature sensor. The microcomputer controls a rotation number of the fan on the basis of the predicted CPU ambient temperature so that a junction temperature of a CPU does not exceed a temperature-specification upper limit value.