关键词: 混合动力汽车；轻型商用车；热管理；低温环境

Abstract: Compared with traditional fuel vehicles, hybrid vehicle can achieve low fuel consumption without range anxiety, which has become a key research object in the field of light commercial vehicles. The vehicle thermal management system controls the cooling and heating of each component to ensure the power and thermal safety of the hybrid vehicle under various working conditions. This paper takes the thermal management system of hybrid light commercial vehicle as the research object, carries out the scheme design based on the principle of optimal cost, verifies its feasibility under low temperature environment, adopts the single factor analysis method to carry out sensitivity analysis of various influencing factors, and proposes the optimization scheme of low temperature preheating strategy to improve the energy consumption performance and thermal stability of hybrid vehicle under low temperature environment. The results show that the thermal management system can meet the needs of the whole vehicle in low temperature environment. Among the influencing factors, the pump speed has the greatest influence, and the low-temperature preheating effect is better when the speed is 2 100 r/min. The higher the initial value of the battery state of charge (SOC), the lower the low-temperature preheating effect.

Key words: Hybrid vehicle; Light commercial vehicle; Thermal management; Low temperature environment