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Design and application of electric oil pump in automatic transmission for efficiency improvement and start–stop function

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Abstract

For the purpose of improving efficiency and realizing start–stop function, an electric oil pump (EOP) is integrated into an 8-speed automatic transmission (AT). A mathematical model is built to calculate the transmission power loss and the hydraulic system leakage. Based on this model, a flow-based control strategy is developed for EOP to satisfy the system flow requirement. This control strategy is verified through the forward driving simulation. The results indicate that there is a best combination for the size of mechanical oil pump (MOP) and EOP in terms of minimum energy consumption. In order to get a quick and smooth starting process, control strategies of the EOP and the on-coming clutch are proposed. The test environment on a prototype vehicle is built to verify the feasibility of the integrated EOP and its control strategies. The results show that the selected EOP can satisfy the flow requirement and a quick and smooth starting performance is achieved in the start–stop function. This research has a high value for the forward design of EOP in automatic transmissions with respect to efficiency improvement and start–stop function.

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Authors and Affiliations

  1. Department of Automotive Engineering, School of Transportation Science and Engineering, Beihang University, Beijing, 100191, China

    Yan-fang Liu  (刘艳芳), Peng Dong  (董鹏), Yang Liu  (刘洋) & Xiang-yang Xu  (徐向阳)

  2. Beijing Key Laboratory for High-efficient Power Transmission and System Control of New Energy Resource Vehicle, Beihang University, Beijing, 100191, China

    Yan-fang Liu  (刘艳芳), Peng Dong  (董鹏), Yang Liu  (刘洋) & Xiang-yang Xu  (徐向阳)

  3. Institute of Industrial and Automotive Drivetrain, Department of Mechanical Engineering, Ruhr-University Bochum, Bochum, 44801, Germany

    Peng Dong  (董鹏)

Authors
  1. Yan-fang Liu  (刘艳芳)
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  2. Peng Dong  (董鹏)
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  3. Yang Liu  (刘洋)
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  4. Xiang-yang Xu  (徐向阳)
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Corresponding author

Correspondence to Peng Dong  (董鹏).

Additional information

Foundation item: Project(51405010) supported by the National Natural Science Foundation of China; Project(2011BAG09B00) supported by the National Science and Technology Support Program of China

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Liu, Yf., Dong, P., Liu, Y. et al. Design and application of electric oil pump in automatic transmission for efficiency improvement and start–stop function. J. Cent. South Univ. 23, 570–580 (2016). https://doi.org/10.1007/s11771-016-3104-2

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  • DOI: https://doi.org/10.1007/s11771-016-3104-2

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