Design of a Hydraulic Control Unit for a Two-Speed Dedicated Electric Vehicle Transmission

Xu, Xiangyang; Sun, Wenbo; Cai, Tianyuan; Liu, Yanfang; Han, Xiao

doi:10.1007/s42154-018-0039-3

Cited by 8 publications

(7 citation statements)

References 9 publications

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“…Finally comes the inverter, which converts the DC to AC and feeds it to the motor for propulsion. 155 The driver continually controls the speed with the pedal, while all other regulations for absorbing or renewing energy are managed internally. 156 The driver instruction serves as a speed reference input to an MCU, which in turn drives a controller.…”

Section: Motor Control Systemmentioning

confidence: 99%

Critical review on optimal regenerative braking control system architecture, calibration parameters and development challenges for EVs

Saiteja

Ashok

Wagh

et al. 2022

Intl J of Energy Research

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Summary Vehicle technology advances and the world shifts towards E‐mobility, improving the performance of electric vehicles (EVs) and HEVs, which are becoming the prominent focus. One of the prime topics of EV development is increasing the driving range, which is the fundamental requirement. Apart from increasing the battery capacity, retrieving the wasted energy during conventional braking, also called as regenerative braking, is a hot topic. In this context, numerous control architectures and major braking approaches are considered to examine in this study in order to create an efficient regenerative braking system (RBS). This review article intends to provide an overview of major subsystems in the RBS such as motor control system and hydraulic braking system and how it affects the braking performance is also well discussed. Additionally, it complies with some of the recent research applications and systematically reviews the several braking control strategies implied. The prominent ones are fuzzy logic control, neural network, MPC, sliding mode, and adaptive control modelling approaches. These control strategies are used to enhance energy regeneration without affecting vehicle performance. Further, this article discusses the RBS design process and its calibration variables, such as speed of the vehicle and brake force estimation, which can be used to improve braking performance. Moreover, challenges on RBS improvements are effectively addressed, coupled with brief suggestions and discussions for the growth of future RBS development. Finally, this article will hopefully help the reader to critically analyse the working of RBS and encourage to design of an efficient RBS for electro‐mobility application. Highlights A holistic overview of the RBS control system architecture and its various control systems is reviewed. Various brake energy control strategies like Fuzzy, MPC, NN, SMC, Adaptive and learning‐based controls are critically evaluated. The discussion of necessary calibration process and its associated parameters are elucidated. Representation of real‐time design and development process of an efficient RBS in EV. Some of the prominent challenges faced during design and development of RBS and scope of future improvement is suggested.

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Section: Motor Control Systemmentioning

confidence: 99%

Critical review on optimal regenerative braking control system architecture, calibration parameters and development challenges for EVs

Saiteja

Ashok

Wagh

et al. 2022

Intl J of Energy Research

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“…In contrast, multispeed transmission makes it possible for EVs to improve drivability as well as efficiency while meet the low-cost demands (Chen et al, 2016;Qin et al, 2016). For the multi-speed transmission design for present pure EVs, automated manual transmission (AMT) (Yu et al, 2013), planetary gear set (PGS) (Fang et al, 2016;Mousavi et al, 2015), and dual clutch transmission (DCT) (Walker et al, 2017;Xu et al, 2018) are all investigated. Considering transmission efficiency, and especially the cost, AMT is generally preferred.…”

Section: Introductionmentioning

confidence: 99%

Coordinated speed and position control of integrated motor-transmission system

Chen

Zhu

2021

Transactions of the Institute of Measurement and Control

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In this paper, a coordinated driving motor speed and shifting motor displacement control strategy is proposed for the integrated motor-transmission (IMT) system during the gearshift process. For active speed synchronization of IMT system, speed reference to driving motor is redesigned by using a polynomial speed trajectory. Compared with conventional step speed change reference, it can help improve the ride performance of IMT system. While in the gear release as well as engagement phase, a robust optimal preview controller is developed for the shifting motor to realize rapid and reliable position tracking of the sleeve in spite of load disturbance. Based on real time value of the driving motor speed and also sleeve axial position, proposed speed and position controllers are coordinated in plan during the whole gearshift process. Co-simulations with Matlab/Simulink and AMEsim are conducted to demonstrate dynamical characteristics of the IMT system during the whole gear shifting process, in which a two-layer switching logic is built by using Matlab/Stateflow. Comparative simulation tests are carried out to show the effectiveness as well as performance of proposed control strategies.

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“…However, for BEVs, since there is no idle state for the motor when the vehicle is parked, so an electric oil pump (EOP) or some other elements similar to accumulator are required when the vehicle starts or runs at early stage to make up the insufficient flow of MOP. Previously developed HCU for 2DET used only one EOP [12]. Through vehicle test, it can be found that the EOP has high energy consumption because of its large displacement in order to meet all running conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In traditional ATs, the constant-displacement mechanical oil pump accounts for 40% of the total power loss [13], so the oil supply and pressure regulation subsystem of the HCU is critical. In order to achieve higher efficiency, the variable-displacement pump is applied [14].…”

Section: Introductionmentioning

confidence: 99%

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Power Control Strategy and Performance Evaluation of a Novel Two-pump Hydraulic Control Unit for BEVs

Liu

Kang

Sun

et al. 2020

Preprint

Self Cite

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A hydraulic control unit system with a mechanical oil pump (MOP) and an electric oil pump (EOP) was newly designed for the lubrication and clutch-to-clutch control of a two-speed dedicated electric transmission for battery electric vehicles (BEVs), in order to solve the high-cost, poor-noise and high-energy-consumption problem exposed in previous single-EOP design with big displacement. The driving motor for BEVs can’t idle like the combustion engine when the vehicle stops still, so an EOP with small displacement is required to supply enough fluid to start the vehicle except to a low-cost MOP. Four control algorithms for the two-pump system were developed as well as the main line pressure control strategy, which were confirmed by a Hardware-in-the-Loop (HIL) test bench. The simulated and tested total pump energy consumption in a driving circle WLTC shows that the equal-power control algorithm and the transient on-demand control algorithm can obtain better performance for saving energy consumption. Several oil displacement parameter groups for the MOP and the EOP are discussed, and the results show that proper displacement group for the EOP and the MOP can obtain good balance for the total cost and the performance with the combination of proper two-pump control strategies.

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Design of a Hydraulic Control Unit for a Two-Speed Dedicated Electric Vehicle Transmission

Cited by 8 publications

References 9 publications

Critical review on optimal regenerative braking control system architecture, calibration parameters and development challenges for EVs

Critical review on optimal regenerative braking control system architecture, calibration parameters and development challenges for EVs

Coordinated speed and position control of integrated motor-transmission system

Power Control Strategy and Performance Evaluation of a Novel Two-pump Hydraulic Control Unit for BEVs

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