| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a technique for sufficiently regulating the number of revolutions of a cooling fan for air-cooling an electrical rear-wheel-drive-power regulation device for regulating drive power applied to rear wheels of a four-wheel drive vehicle.SOLUTION: A current detector detecting a carrying current for carrying a current to a motor regulating drive power applied to rear wheels from an inverter, and an integration unit integrating current values detected within previous predetermined time are prepared. The number of revolutions of a cooling fan is determined according to a rule that the number of revolution becomes higher as temperature detected by a temperature detector is higher, and the number of revolutions becomes lower as the integration current value integrated by the integration unit is smaller. In summer in which a calorific value is small, the cooling fan is prevented from unnecessary rotation due to reduction in the number of revolutions.</p> |
