Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (9): 1996-2003.doi: 10.13229/j.cnki.jdxbgxb20220345

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Oxygen excess ratio control method of proton exchange membrane fuel cell air system for vehicle

Pei ZHANG1,2,3(),Zhi-wei WANG1,2,3,Chang-qing DU1,2,3(),Fu-wu YAN1,2,3,Chi-hua LU1,2,3   

  1. 1.Hubei Key Laboratory of Modern Auto Parts Technology，Wuhan University of Technology，Wuhan 430070，China
    2.Auto Parts Technology Hubei Collaborative Innovation Center，Wuhan University of Technology，Wuhan 430070，China
    3.Hubei Technology Research Center of New Energy and Intelligent Connected Vehicle Engineering，Wuhan University of Technology，Wuhan 430070，China
  • Received:2022-03-30 Online:2022-09-01 Published:2022-09-13
  • Contact: Chang-qing DU E-mail:zhangpei@whut.edu.cn;cq_du@126.com

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Abstract:

Aiming at the problem of optimal oxygen excess ratio （OER） control method of vehicle proton exchange membrane fuel cell （PEMFC） system， a control oriented third-order nonlinear air system model based on 60 kW PEMFC system was constructed， and dynamic feedforward+PI controller based on steady-state operating point approximate linearization model and feedforward/feedback linearization controller based on global linearization model were designed respectively. The simulation results show that the feedforward/feedback linearization method solves the problem of steady-state error in OER response due to model error based on approximate linearization model control method， and eliminates the influence of load current change on OER response by introducing nonlinear feedforward structure. In addition， the feedforward/feedback linearization control method can track the best OER under different working conditions， and effectively improve the efficiency of PEMFC system.

Key words: vehicle engineering, proton exchange membrane fuel cell system（PEMFC）, air supply system, oxygen excess ratio（OER）, feedforward/feedback linearization

CLC Number: 

  • TM911.4

Table 1

Model parameters"

定义取值
电机机械效率ηcm0.9
压缩机效率ηcp0.8
电机电枢内阻Rcm/Ω0.82
电机转矩灵敏度常数kt/（N·m·A-1）0.0153
电机反电动势常数kv/［V·（rad-1·s）］0.0153
压缩机转动惯量Jcp/10-5 （kg·m2）5
空气比热容Cp/［J·（kg·K）-1］1004
大气温度Tatm/K298.15
热比例系数γ1.4
进气管道体积Vsm/m30.02
进气管道出口流量常数ksm/10-6 ［kg·（s·Pa）-1］3.629
空气气体常数Ratm/［J·（kg·K）-1］286.9
电堆阴极温度Tst/K353.15
电堆阴极出口流量系数kca/10-6 ［kg·（s·Pa）-1］1.5
阴极侧体积Vca/m30.01
大气压力Patm/Pa101 325
理想气体常数R8.314 5
电堆电池片数n_cell300
法拉第常数F96 485
氧气的摩尔质量/（kg·mol-1）0.032
空气中氧气的质量分数0.232

Fig.1

Structure of dynamic feedforward + PI feedback controller"

Fig.2

Step current signal"

Fig.3

Oxygen excess ratio response under step current condition"

Fig.4

Structure of error feedback controller"

Fig.5

Oxygen excess ratio response（first set of simulations）"

Fig.6

Ramp current signal"

Fig.7

Oxygen excess ratio response（second set of simulations）"

Table 2

Partial calibration value of optimal oxygen excess ratio"

负载电流/A

最佳过氧比

标定值

负载电流/A

最佳过氧比

标定值

31.322.140254.462.187
58.702.094283.862.037
86.092.320312.202.011
113.492.140340.202.080
142.872.016368.102.041
169.282.180397.502.040
198.672.098422.902.035
227.072.096451.802.020

Fig.8

Oxygen excess ratio response （third set of simulations）"

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