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融合工況預測的燃料電池汽車里程自適應等效氫耗最小控制策略

Trip distance adaptive equivalent hydrogen consumption minimization strategy for fuel-cell electric vehicles integrating driving cycle prediction

  • 摘要: 為有效地提高插電式燃料電池汽車的經濟性,實現燃料電池和動力電池的功率最優分配,考慮到行駛工況、電池荷電狀態(State of charge, SOC)、等效因子與氫氣消耗之間的密切聯系,制定融合工況預測的里程自適應等效氫耗最小策略. 通過基于誤差反向傳播的神經網絡來實現未來短期車速的預測,分析未來車輛需求功率變化,同時借助全球定位系統規劃一條通往目的地的路徑,智能交通系統便可獲取整個行程的交通流量信息,利用行駛里程和SOC實時動態修正等效消耗最小策略中的等效因子,實現能量管理策略的自適應性. 基于MATLAB/Simulink軟件,搭建整車仿真模型與傳統的能量管理策略進行仿真對比驗證. 仿真結果表明,采用基于神經網絡的工況預測算法能夠較好地預測未來短期工況,其預測精度相較于馬爾可夫方法提高12.5%,所提出的能量管理策略在城市道路循環工況(UDDS)下的氫氣消耗比電量消耗維持(CD/CS)策略下降55.6%. 硬件在環試驗表明,在市郊循環工況 (EUDC)下的氫氣消耗比CD/CS策略下降26.8%,仿真驗證結果表明了所提出的策略相比于CD/CS策略在氫氣消耗方面的優越性能,并通過硬件在環實驗驗證了所提策略的有效性.

     

    Abstract: The environment pollution and petroleum problems, which are increasingly becoming serious, have caused the vehicle industry to transition into a low-carbon and energy-saving industry. During processes, plug-in fuel-cell electric vehicles (PFCEVs) play an important role due to their advantages of rapid fueling, high energy density and efficiency, low operating temperature, and zero onboard emissions. PFCEVs use high-capacity rechargeable batteries to avoid working in low-efficiency areas. However, a robust energy management strategy that can achieve reliable energy distribution by regulating the output power of the fuel cell and battery within the hybrid powertrain merits further investigation. Considering the close relationship between the driving cycle, state of charge (SOC), equivalent factor, and hydrogen consumption, a trip distance adaptive equivalent consumption minimum strategy integrating driving cycle prediction is proposed. A backpropagation-based neural network is used to predict short-term vehicle velocity and analyze future changes in vehicle demand power. Planning a path to the destination with the help of the global positioning system, the intelligent transportation system can also obtain traffic flow information for the entire trip. The equivalent factor is dynamically corrected in real time using the driving distance and SOC to realize the adaptability of the energy management strategy. Finally, the velocity prediction sequence is combined with the objective function. The sequential quadratic programming algorithm is used to optimize the equivalent hydrogen consumption of the objective function and to obtain the distributed power of the fuel cell and battery. The vehicle simulation model is built and compared with a traditional energy management strategy based on MATLAB/Simulink software. The simulation results show that the driving cycle prediction algorithm based on the backpropagation-based neural network predicts future short-term conditions better, with a 12.5% higher accuracy than the Markov method. The proposed energy management strategy allows the fuel cell to operate in high-efficiency areas. The hydrogen consumption is 55.6% less than that of the CD/CS strategy under the UDDS cycle. The hardware in the loop experiment verifies a hydrogen consumption that is 26.8% less than that of the CD/CS strategy under the EUDC cycle. The numerical validation results demonstrate the superior performance of the proposed strategy in terms of hydrogen consumption over the CD/CS strategy. The effectiveness of the proposed strategy is validated by hardware during the loop experiment.

     

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