| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress a power consumption while suppressing the excessive temperature rise of a motor or an inverter. <P>SOLUTION: When a running route is set by a navigation device 50, the prediction temperature of cooling water in a circulation pipeline 22 is presumed based on the road gradient of the running route. Then, a switching threshold for switching an Hi drive and a Lo drive of a motor-operated water ump 24 is set based on the presumed predicted temperature. And, when the temperature of the cooling water from the temperature sensor 29 exceeds the switching threshold value, the motor-driven water pump 24 is switched from the Lo drive to the Hi drive. When an ascent gradient is large and loads of motors MG1, MG2 and inverters 15, 16 are large, a small value is set to the switching threshold value. Thus, the motor-driven water pump 24 is set to be easily Hi driven, and the excessive temperature rise can be suppressed. When the ascent gradient is small and the loads are small, a large value is set to the switching threshold value so that the Lo drive is easily maintained. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
