关键词: 电驱重载；动力单元；冷却系统；设计改进

Abstract: With the development of vehicle electrification, the research and development of heavyload vehicles is also developing in the direction of high mobility and electric drive. In view of the overtemperature alarm problem of the power unit in the use process of an electric drive overloaded vehicle, this paper first analyzes all the sports car data of the vehicle, and studies the common working conditions of the power unit and the design margin of each radiator. Secondly, the modified design objectives of engine water dispersion and motor and controller water dispersion are proposed to increase 10% and reduce 10% respectively. Finally, the height of the engine and the motor and controller are redesigned. After the redesign, the height of the engine is increased to 1.12 times of the original size, and the height of the motor and controller is reduced to 0.94 times of the original size. The improved radiator meets the design requirements and is used well.

Key words: electro driven heavy-duty; power units; cooling system; design improvement