48 V微混发动机电动智能冷却系统

Study on Electric Intelligent Cooling System of 48V Mild Hybrid Engine

在电动附件上应用48 V技术,降低功耗和发动机油耗。比较电动水泵与传统机械水泵能量流的区别,测试电动水泵和机械水泵在不同转速下的功耗,分析新欧洲驾驶循环(new European driving cycle, NEDC)下机械水泵和电动水泵的功耗差异;测试电动风扇在NEDC循环下的功耗;测试评估提高冷却液温度、降低水泵和风扇转速对发动机油耗的影响。结果表明,电动智能冷却系统可以精准稳定地控制发动机冷却液温度,水泵电动化使NEDC循环的水泵功耗降低38%,水温由80℃提高到100℃,NEDC循环电动风扇的功耗降低60%,水泵和风扇功耗降低,水温提升引起的散热量减小,NEDC循环油耗降低3.34%。

Reducing power dissipation and engine fuel consumption can be realized by using 48 V technology on the electric accessories. The power flow difference between mechanical cooling pump and electric cooling pump was compared, and the power consumption of both mechanical cooling pump and electric cooling pump were measured. The power consumption difference of these two kinds of pumps was analyzed experimentally under new European driving cycle(NEDC). Then, the power consumption of electric cooling fan was measured and analyzed under the NEDC. The influence of coolant temperature rise and reduction of cooling pump and fan speed on fuel consumption was evaluated experimentally. Test results show that engine coolant temperature could be controlled accurately and stably by the electric intelligent cooling system. Under the NEDC, pump power consumption shows a 38% reduction using the electric pump, and fan power consumption is reduced by 60% when the coolant temperature rise from 80℃ to 100℃. Due to the reduction of pump and fan power consumption, heat dissipating capacity caused by coolant temperature rising decreases, and the NEDC fuel consumption is reduced by 3.34%.