关键词: 车辆工程；电动汽车；集成化热管理；柴油液体加热器；多级模糊控制

Abstract: To address the reduction in the driving range of pure electric vehicles caused by battery performance degradation and surging energy consumption for cabin heating under low-temperature conditions, an integrated thermal management heating system based on the diesel liquid heater was proposed. Using the diesel liquid heater as an independent heat source, the passenger cabin and battery circuits were coupled via an electronic three-way valve, enabling centralized supply and dynamic distribution of thermal energy. For the dual-heating mode, a multi-level fuzzy control strategy framework was designed for the electronic three-way valve and the battery water pump. The valve opening and battery water pump speed were dynamically adjusted according to the heating demands of the passenger cabin and battery circuit, as well as changes in battery temperature. The system model was built and co-simulated by use of AMEsim and MATLAB/Simulink. The results demonstrate that, compared with the traditional independent circuit system, the proposed integrated system saves approximately 8 % of battery power and enhances the driving range by about 27 % in a -15 ℃ environment. Furthermore, the multi-level fuzzy control strategy shows superior dynamic response and energy efficiency performance in the coordinated control of the electronic three-way valve and the battery water pump, reducing energy consumption of battery water pumps by about 52%.

Key words: vehicle engineering; electric vehicle; integrated thermal management; diesel liquid heater; multi-level fuzzy control