增程式混动汽车冷却系统控制策略

Control strategy of cooling system for extended-range hybrid vehicle

为降低增程式电动汽车冷却系统的总功耗,分析水泵和风扇功率分配对冷却效果的影响,在保证冷却效果的前提下,计算不同散热量和风速下功耗最低的水泵与风扇的转速组合;在Simulink中搭建冷却系统的控制模型,优化设计冷却系统控制策略并进行仿真试验。仿真结果表明:相比传统固定转速比的冷却系统控制策略,在1次增程器开启、关闭过程中,优化后的发动机冷却系统可节能9.51%;在新标欧洲循环测试下,优化后的电机冷却系统可节能25.64%。

To reduce the total power consumption of the extended-range hybrid vehicle cooling system,the influence of the power distribution of the water pump and fan on the cooling effect is studied.Under the premise of ensuring the cooling effect,the speed of the pump and fan with the lowest power consumption under different heat dissipation and wind speed is calculated.The control model of the cooling system is built in Simulink to optimize the control strategy,and simulation analysis is carried out.The results show that the optimized engine cooling system can save energy by 9.51%compared with the traditional cooling system control strategy with a fixed speed ratio during the opening and closing process of the primary range extender;under the new European driving cycle(NEDC),the optimized motor cooling system can save energy by 25.64%.