International Journal of Automotive Technology

, Volume 19, Issue 1, pp 147–157 | Cite as

Hydraulic control system design for a PHEV considering motor thermal management

  • Jingyu Choi
  • Kyunggook Bae
  • Junbeom Wi
  • Sunghyun Ahn
  • Hyunsoo Kim


In this paper, a design method for a PHEV hydraulic control system was proposed considering motor thermal management. Dynamic models of the target PHEV were developed including the hydraulic system, which consists of one mechanical and one electric oil pump. The required motor cooling flow was designed based on the motor temperature, which was obtained from a one-dimensional thermal equivalent circuit model including the heat source and oil spray cooling. Combining the PHEV powertrain model, hydraulic control system model, and the motor thermal model including the cooling system, an integrated simulator was developed for the target PHEV. Using the integrated simulator, the temperatures of MG1 and MG2 were investigated for various motor cooling flow rates when the PHEV underwent a highway driving cycle. The energy consumption of the hydraulic control system was also evaluated. It was found from the simulation results that a hydraulic control system of the target PHEV could be designed that satisfied the required flow for the motor cooling, lubrication and brake control using the design procedure proposed in this study.


Plug-in hybrid electric vehicle Hydraulic control system Motor cooling Thermal equivalent circuit model Energy consumption 



torque, Nm


rotational speed, rad/s


pump displacement, cc/rev / diameter, m


pressure displacement, N/m2 / power, W


efficiency, -


flow rate, lpm / heat, W / battery capacity, Ah


energy consumption, J / electromotive force, J/C


area, m2


radius, m / resistance, ohm


friction coefficient, -


number of clutch plates, -


force, N


phase current, A


torque constant


velocity, m/s


length, m


voltage, V


vehicle mass, kg




gravitational acceleration, m/s2


gradient angle, rad


air density, kg/m3



mechanical oil pump


electric oil pump












lubrication flow








effective radius




copper loss


root means square


iron loss


sprayed cooling flow






internal resistance



road load

road load


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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag GmbH Germany 2018

Authors and Affiliations

  • Jingyu Choi
    • 1
  • Kyunggook Bae
    • 1
  • Junbeom Wi
    • 1
  • Sunghyun Ahn
    • 1
  • Hyunsoo Kim
    • 1
  1. 1.School of Mechanical EngineeringSungkyunkwan UniversityGyeonggiKorea

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