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Automotive Engineering ›› 2025, Vol. 47 ›› Issue (7): 1258-1267.doi: 10.19562/j.chinasae.qcgc.2025.07.003

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Bypass Flow Estimation of Fuel Cell Engine Air System

Yuqi Qiu1,Chuan Yang2,Tao Zeng2,Yuanhai Zhang2,Zhengxing Liu2,Xuezhi Zhang3,Qinghua Yu2,Caizhi Zhang1()   

  1. 1.School of Mechanical and Vehicle Engineering,Chongqing University,Chongqing 400044
    2.Deepal Automotive Technology Co. ,Ltd. ,Chongqing 400020
    3.Hebei Kingston Technology Co. ,Ltd. ,Xinji 050031
  • Received:2025-02-20 Revised:2025-03-26 Online:2025-07-25 Published:2025-07-18
  • Contact: Caizhi Zhang E-mail:czzhang@cqu.edu.cn

Abstract:

For the problem of high temperature resistance of the flow meter at the bypass valve, a method to estimate the bypass flow is proposed based on a semi-physical and semi-empirical model in this paper. Firstly, a fuel cell engine air system is established. Compared to the traditional control structure, the air system eliminates the humidifier and adds an air circuit bypass valve. Secondly, based on the collected data, the effectiveness of the established bypass flow estimation model is verified by simulation. Finally, the model is verified online in the test bench. Simulation and experimental studies show that the proposed model has an average relative error rate of 2.72% and 3.35% when the bypass valve opening is 2°-32° and 34°-42°, respectively. The model has high accuracy and can be used for air system structural design optimization and surge control strategy development.

Key words: bypass valve, semi-physical and semi-empirical model, bypass flow estimation, fuel cell engine, air system