电动车跨临界 CO2 热系统多解耦合诱发控制失效机制
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关键词：跨临界 CO2 ；控制失效；多解耦合
中图分类号：TB615文献标志码：A
DOI：10.7652/xjtuxb202601002 文章编号：0253-987X（2026）01-0014-08
Mechanism of Multi-Solution Coupling Induced Control Failure in Transcritical CO2 Thermal Systems for Electric Vehicles
FANG Jianmin1，ZHANG Yichen1，YIN Xiang1，CHEN En2 ， CAO Feng （1. School of Energy and Power Engineering，Xi'an Jiaotong University，Xi'an 71oo49，China; 2.Hefei General Machinery Research Institute Co.，Ltd.，Hefei 23oo31，China）
Abstract： To investigate the discharge pressure issue in transcritical CO2 thermal systems for electric vehicles under conventional high-precision empirical formula prediction methods and clarify the mechanism of multi-solution coupling induced control failure，the control failure in such transcritical CO2 thermal systems under variable operating conditions is compared and analyzed. By deeply examining the variable correlations in conventional optimal pressure control methods and the multi-solution convergence characteristics of dynamic system control， the mechanism underlying control failure in CO2 thermal systems during dynamic operation of electric vehicles is fundamentally revealed. Based on this，a control method to suppress dynamic failure under variable conditions in electric vehicle CO2 thermal systems is proposed. The results indicate that the initial boundary conditions affect the convergence of CO2 dynamic control. Under failure modes， the system’s energy efficiency ratio decreases by nearly 30% . The coupling characteristics between the gas cooler outlet and the expansion valve inlet temperatures，determined by the thermophysical properties of supercritical CO2 ， may be the direct cause of thermodynamic multi-solutions and dynamic failure. The proposed control method enables effective convergence to the desired operating condition among multiple solutions during dynamic operation. It provides theoretical insights into pressure control issues in automotive transcritical CO2 air conditioning systems.
Keywords： transcritical CO2 ; control failure;multi-solution coupling
随着新能源汽车行业和环保型替代制冷剂的发展，应用于电动汽车的跨临界 CO2 热管理系统受到广泛关注[1-3]。（剩余12157字）
