Analysis of Multi-solution Problem and Failure Mechanisms in Pressure Control of Transcritical CO<sub>2</sub> Thermal Management System

FANG Jianmin; ZHANG Yichen; YIN Xiang; CAO Feng

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Analysis of Multi-solution Problem and Failure Mechanisms in Pressure Control of Transcritical CO₂ Thermal Management System

更新时间：2025-11-18

- Analysis of Multi-solution Problem and Failure Mechanisms in Pressure Control of Transcritical CO₂ Thermal Management System
- Moren Journal (2025)
- 作者机构：
  
  西安交通大学能源与动力工程学院,陕西省西安市710049,中国
- 作者简介：
- 基金信息：
- DOI：
  CLC： TB615
- Received：23 May 2025，
  
  Revised：2025-07-15，
  
  Accepted：21 July 2025，
- 稿件说明：
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FANG Jianmin, ZHANG Yichen, YIN Xiang, et al. Analysis of Multi-solution Problem and Failure Mechanisms in Pressure Control of Transcritical CO₂ Thermal Management System[J/OL]. Moren Journal, 2025.
DOI：

FANG Jianmin, ZHANG Yichen, YIN Xiang, et al. Analysis of Multi-solution Problem and Failure Mechanisms in Pressure Control of Transcritical CO₂ Thermal Management System[J/OL]. Moren Journal, 2025. DOI：

摘要

为了研究电动车跨临界CO

热系统在常规高精度经验公式预测方法下的排气压力问题，阐明多解耦合诱发控制失效的作用机制，论文基于电动车跨临界CO

热系统，理论对比分析了变工况下的电动车跨临界CO

热系统控制失效现象，通过深入分析常规最优压力控制方式的变量相关性及系统动态控制的多解收敛特征，从本质上揭示了电动车动态运行过程的CO

热系统控制失效发生机制，并基于此提出了抑制电动车CO

热系统变工况动态失效的控制策略。结果表明：原初始边界影响CO

动态控制收敛性，失效模式下系统能效比下降近30%，超临界CO

物性决定的气体冷却器出口和节流阀前温度耦合特性可能是产生热力学多解和动态失效的直接原因，所提出的控制策略可以使得动态运行在多解中有效收敛至所需工况。研究为车用跨临界CO

空调的压力控制问题提供了理论参考。

Abstract

To study discharge pressure control issue in the transcritical CO

thermal system in electric vehicles under conventional high-precision empirical formula predication method

and elucidate the mechanism of the control failure induced by the multi-solution coupling. This study investigates control failure in transcritical CO

system under dynamic working conditions. The variable relevance of the conventional optimal pressure control method and the multi-solution convergence characteristics of dynamic system control are theoretical comparative analyzed. Thus

the root causes of control failure in CO₂ thermal systems during dynamic EV operation are fundamentally revealed. Based on these findings

a novel control method is proposed to suppress dynamic failures under variable conditions. The results show that the initial boundary conditions influence the convergence of CO₂ dynamic control. In failure modes

the system’s coefficient of performance (COP) degrades by nearly 30%. The coupling effect between the temperatures at gas cooler outlet exit and the throttling valve inlet

dictated by the thermophysical properties of super

critical CO

might be identified as the direct cause of thermodynamic multi-solution phenomena and control failure. The proposed control strategy effectively guides the system to converge to the desired operating state among multiple solutions. This research provides theoretical insights into pressure control challenges in automotive transcritical CO₂ air conditioning systems.

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references

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Related Author

FANG Jianmin

ZHANG Yichen

YIN Xiang

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CAO Feng

Related Institution

School of Energy and Power Engineering, Xi'an Jiaotong University

Hefei General Machinery Research Institute Co., Ltd.

⁰

Analysis of Multi-solution Problem and Failure Mechanisms in Pressure Control of Transcritical CO2 Thermal Management System

DOI：

摘要

Abstract

关键词

Keywords

references

Analysis of Multi-solution Problem and Failure Mechanisms in Pressure Control of Transcritical CO₂ Thermal Management System