Two-Speed DCT Electric Powertrain Shifting Control and Rig Testing

Zhu, Bo; Zhang, Nong; Walker, Paul; Zhan, Wenzhang; Zhou, Xingxing; Ruan, Jiageng

doi:10.1155/2013/323917

Cited by 40 publications

(22 citation statements)

References 9 publications

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“…Generally, the cooperation between two clutches is already enough to accomplish most of the gearshifts, which is similar to the shift process in DCT. [18][19][20][21][22] However, in MCT, four clutches including CL, CH, C1, and C3 are involved during the shift process between third and fourth. Thus, it is necessary to propose a special control strategy for this gearshift process.…”

Section: Mct Structure and Working Principlementioning

confidence: 99%

Upshift control strategy for off-highway vehicles equipped with multi-clutch transmission

Liu

et al. 2017

Advances in Mechanical Engineering

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The purpose of this article is to propose an upshift control strategy for off-highway vehicles equipped with a new kind of drivetrain architecture, which is called multi-clutch transmission, by means of analysis, modeling, and experiments. First, the structure and working principle of the multi-clutch transmission is investigated in detail. Then, to achieve a smooth 3-4 upshift process with two on-coming clutches and two off-going clutches working together, the method of power flow investigation is introduced. From the analysis results, the optimal relationship between clutches is presented to avoid engine flare and clutch tie-up. Additionally, the engagement sequence of on-coming clutches is also optimized to reduce the shift time and friction work. Then, with the proposed control strategy, a dynamic model for the integrated off-highway vehicle is developed using MATLAB/Simulink. From the variations in torque and speed output obtained from the simulation results, the vehicle equipped with multi-clutch transmission possesses good longitudinal dynamic performance, with acceptable friction work generated from two slipping clutches during the entire upshift process. Finally, to assess the shift quality, the test bench has been conducted. The obtained experimental data show a good agreement with the simulation results and the effectiveness of the control strategy is validated.

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Section: Mct Structure and Working Principlementioning

confidence: 99%

Upshift control strategy for off-highway vehicles equipped with multi-clutch transmission

Liu

et al. 2017

Advances in Mechanical Engineering

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“…It is an optimized two-speed DCT, which has a good transient control performance during the shifting. [13] Because EV"s power directly comes from power grid in the laboratory, there is no limiting factor for recovery current in motor. That means no matter how much feedback energy generated by motor, it is assumed to be absorbed totally by battery unit.…”

Section: Picture 1: Vehicle Dynamic Modelmentioning

confidence: 99%

Experimental Verification of regenerative braking energy recovery system based on electric vehicle equipped with 2-speed DCT

Ruan¹,

Walker²,

Zhu³

2014

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)

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Electric vehicles (EVs), as the most promising long term trend in environment friendly transportation, worldwide attracts significant amount of research. However the consumer acceptance of EVs is still restricted by the limited range in comparison to its counterpart-internal combustion engine vehicles. Energy recovery through regenerative braking, as an inherent advantage of EVs, is a feasible option to contribute to the alleviation of this problem by recuperating braking energy during braking. The motor recovers electric energy instead of dissipating heat when driver decelerates vehicle. There have also been many attempts at integrating various transmissions with EVs to extend the mileage and improve the performance of electric vehicle, but few have noticed that Dual Clutch Transmission (DCT) as a higher efficiency transmission system may be more suitable for EVs than other transmissions, especially with a simpler structure when only two speed ratios are utilised. In this paper, a regenerative braking system for Two-Speed Dual Clutch Transmission-based electric vehicles is proposed. Results from simulation and experiment validate that the proposed braking energy recovery system works efficiently on a Twospeed DCT based EV.

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“…24,25 It is noted that under a given demand power and vehicle speed, the instantaneous motor torque is directly influenced by the transmission gear ratio selection and shifting schedule. Hence, there are some researches on EVs' gear shift schedule design and optimization, such as Floyd 26 and Zhu et al 27 Some researches such as Sorniotti et al 28 and Zhou et al 29 consider the multispeed EV powertrain optimization as a function of the electric motor properties. However, these references only focus on gear shift schedule optimization with given gear ratios without considering the best use of gear ratios to maximize electric motor efficiency.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive design and optimization of an electric vehicle powertrain equipped with a two-speed dual-clutch transmission

Wang

Lü

et al. 2017

Advances in Mechanical Engineering

Self Cite

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This article develops a systematic model to study electric vehicle powertrain system efficiency by combining a detailed model of two-speed dual-clutch transmission system efficiency losses with an electric vehicle powertrain system model. In this model, the design factors including selection of the electric machine, gear ratios' change, multi-plate wet clutch design, and gear shift schedule design are considered. Meanwhile, the application of detailed model for drag torque losses in the gearbox is discussed. Furthermore, the proposed model, developed with the MATLAB/Simulink platform, is applied to optimize/maximize the efficiency of the electric vehicle powertrain system using genetic algorithms. The optimization results demonstrate that the optimal results are different between simulations via New Europe Drive Cycle and Urban Dynamometer Driving Schedule, and comprehensive design and optimization of the powertrain system are necessary.

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Two-Speed DCT Electric Powertrain Shifting Control and Rig Testing

Cited by 40 publications

References 9 publications

Upshift control strategy for off-highway vehicles equipped with multi-clutch transmission

Upshift control strategy for off-highway vehicles equipped with multi-clutch transmission

Experimental Verification of regenerative braking energy recovery system based on electric vehicle equipped with 2-speed DCT

Comprehensive design and optimization of an electric vehicle powertrain equipped with a two-speed dual-clutch transmission

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