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DLPformer: A Hybrid Mathematical Model for State of Charge Prediction in Electric Vehicles Using Machine Learning Approaches

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  • Yaoyidi Wang

    (School of Electronic Information Engineering, Shanghai Dianji University, Shanghai 201306, China)

  • Niansheng Chen

    (School of Electronic Information Engineering, Shanghai Dianji University, Shanghai 201306, China)

  • Guangyu Fan

    (School of Electronic Information Engineering, Shanghai Dianji University, Shanghai 201306, China)

  • Dingyu Yang

    (Alibaba Group, Hangzhou 310056, China)

  • Lei Rao

    (School of Electronic Information Engineering, Shanghai Dianji University, Shanghai 201306, China)

  • Songlin Cheng

    (School of Electronic Information Engineering, Shanghai Dianji University, Shanghai 201306, China)

  • Xiaoyong Song

    (School of Electronic Information Engineering, Shanghai Dianji University, Shanghai 201306, China)

Abstract

Accurate mathematical modeling of state of charge (SOC) prediction is essential for battery management systems (BMSs) to improve battery utilization efficiency and ensure a good safety performance. The current SOC prediction framework only considers battery-related features but ignores vehicle information. Additionally, in light of the emergence of time-series Transformers (TSTs) that harness the power of multi-head attention, developing a SOC prediction model remains a significant challenge. Therefore, we introduce a new framework that integrates laboratory battery data with mathematical vehicle model features to improve the accuracy of the SOC and propose a prediction model named DLPformer, which can effectively capture variations in the SOC attributed to both trend and seasonal patterns. First, we apply Matlab/Simulink to simulate a mathematical model of electric vehicles and process the generated vehicle data with Spearman correlation analysis to identify the most relevant features, such as the mechanical losses of the electric motor, differential, and aerodynamic drag. Then, we employ a data fusion method to synchronize the heterogeneous datasets with different frequencies to capture the sudden changes in electric vehicles. Subsequently, the fused features are input into our prediction model, DLPformer, which incorporates a linear model for trend prediction and patch-input attention for seasonal component prediction. Finally, in order to effectively evaluate the extrapolation and adaptability of our model, we utilize different driving cycles and heterogeneous battery datasets for training and testing. The experimental results show that our prediction model significantly improves the accuracy and robustness of SOC prediction under the proposed framework, achieving MAE values of 0.18% and 0.10% across distinct driving cycles and battery types.

Suggested Citation

  • Yaoyidi Wang & Niansheng Chen & Guangyu Fan & Dingyu Yang & Lei Rao & Songlin Cheng & Xiaoyong Song, 2023. "DLPformer: A Hybrid Mathematical Model for State of Charge Prediction in Electric Vehicles Using Machine Learning Approaches," Mathematics, MDPI, vol. 11(22), pages 1-21, November.
  • Handle: RePEc:gam:jmathe:v:11:y:2023:i:22:p:4635-:d:1279412
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    References listed on IDEAS

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