Design, modelling and estimation of a novel modular multi-speed transmission system for electric vehicles

Roozegar, M.; Setiawan, Yuhanes Dedy; Ángeles, Jorge

doi:10.1016/j.mechatronics.2017.06.002

Cited by 30 publications

(11 citation statements)

References 19 publications

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“…A two-speed automatic manual/mechanical transmission (AMT) system is considered for the EV model in this study. For an EV powertrain, several types of multi-speed transmission system are available to choose such as automatic transmission (AT) [30,31], continuous variable transmission (CVT), dual-clutch transmission (DCT) [32,33], inverse automatic mechanical transmission (IAMT) [4,34], uninterrupted mechanical transmission (UMT) [35], automatic mechanical transmission (AMT), etc. Each type of transmission system has its own benefits or limitations.…”

Section: Transmissionmentioning

confidence: 99%

Gear Ratio Optimization along with a Novel Gearshift Scheduling Strategy for a Two-Speed Transmission System in Electric Vehicle

2020

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A novel gearshift scheduling strategy has been framed for a two-speed transmission system in electric vehicles that can save energy during hilly driving and frequently changing driving conditions through efficient electric motor operation. Unlike the traditional approach, the proposed gearshift strategy is based on the preferred vehicle speed range, vehicle acceleration, and road grade to ensure desired vehicle performances with minimum energy consumption. Meanwhile, the vehicle speed range is chosen around the electric motor rated speed, and two gearshift schedules in relation to vehicle acceleration and road grade are developed based on the motor torque generating capacity and efficiency. Appropriate gear is selected through a combined assessment of the required vehicle speed, acceleration, and road grade information. A guideline is developed and explained for the primary gearshift schedule. Next, the gear ratios and gearshift schedules are optimized combinedly in a Simulink environment using the gradient descent method and pattern search method on three driving cycles separately. Depending on the driving scenarios, around 4% to 7.5% energy saving has been experienced through optimization, while the gear ratios and gearshift schedule in relation to the road grade are found to be major contributors to the vehicle economic driving compared to that with the gearshift schedule for vehicle acceleration.

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Section: Transmissionmentioning

confidence: 99%

Gear Ratio Optimization along with a Novel Gearshift Scheduling Strategy for a Two-Speed Transmission System in Electric Vehicle

2020

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“…In order to illustrate the application of our topology-change model, a case study is included, whereby the model of Eq. ( 11) is applied to a novel modular MST intended for EVs [11]. The MST uses a planetary gear set (PGS).…”

Section: Case Studymentioning

confidence: 99%

“…In addition, an application of multi-speed transmissions (MSTs) has been of interest because EMHVs otherwise need large electric motors (EMs) to carry heavy loads. Improvement of EV range and performance due to the application of MSTs has been verified [11][12][13][14][15][16]. To illustrate the improvement, an MST developed by Antonov Automotive Technologies Ltd. in Warwick, U.K. was able to maintain the EM at efficiency values higher than 90%.…”

Section: Introductionmentioning

confidence: 99%

A topology-change model of multi-speed transmissions in electric vehicles during gear-shifting

et al. 2018

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Recent developments in electric vehicles incorporate multi-speed transmissions to improve the electric vehicle range and performance. Similar to transmissions for fossil-fuel vehicles, those for their electric counterparts undergo topology changes during gear-shifting. However, this important phenomenon has been overlooked in the development of transmission mathematical models, which results in inaccurate prediction of the transmission dynamic response. In this study, a topology-change model based on the impulse-momentum relation is developed to address the topology change of multi-speed transmissions in electric vehicles during gear-shifting. An orthogonal complement is introduced to eliminate the non-working constraint forces. The velocity jump brought about by topology changes is given due attention. A case study is included, whereby the model is applied to a novel modular multi-speed transmission for electric vehicles. First, tests are conducted on the transmission experimental testbed; then, the test results are reproduced in simulation using the model developed herein. Moreover, the velocity jump of the gear-shifting is computed by means of the model. Subsequently, simulation of the transmission gear-shifting incorporating the velocity jump is conducted. It is shown that the topology-change model improves the accuracy of transmission mathematical models in predicting transmission dynamic responses during gear-shifting.

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“…As the surging demand of the general publics for more environmental friendly and more comfort vehicle, transmission has been developed to be swifter and smoother in recent years (Maruyama et al, 2017). For electric vehicle (EV), due to its low efficiency and the current low energy-storage capacity of electric batteries, new transmission structures have been contrived, such as multi-speed transmission (MST) proposed in Roozegar and Angeles (2018) and Roozegar et al (2017), and the inverse automated manual transmission (I-AMT) proposed in Gao et al (2015). For inner combustion engine vehicle, to achieve better performance than traditional manual transmission (MT), generally four types of transmissions have been developed: continuously variable transmission (CVT), dual clutch transmission (DCT), automatic transmission (AT) and automated manual transmission (AMT).…”

Section: Introductionmentioning

confidence: 99%

Modelling, Analysis and Simulation of a Novel Automated Manual Transmission with Gearshift Assistant Mechanism

Zhiqiang

Gao

Jin

et al. 2019

Int.J Automot. Technol.

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To eliminate or reduce torque interruption and driveline jerk for traditional automated manual transmission (AMT), AMT with a gearshift assistant mechanism (GAM) is originally proposed in this paper. The GAM consists of a torque complementary motor and an epicyclic mechanism with a synchronizing clutch. During gear upshift, the electrical motor provides complementary torque to primary (output) shaft after synchronizer discharges, then the synchronizing clutch will work to synchronize primary shaft with anticipated gear. The lockup of the synchronizing clutch will ensure the synchronization of primary shaft and anticipated gear. After finishing synchronizing, synchronizer will lock up the anticipated gear and engine recovers torque supply to finish gearshift. Based on the mathematical model of the proposed transmission, its detailed structure, kinematic character and dynamic behavior are discussed. Controllers are designed to achieve presumed gearshift performance, and simulation results show its effectiveness. Problems may be encountered in engineering application and possible application on electrical vehicle (EV) of the proposed transmission are also discussed. Finally, this paper summarized the merits and further research targets of the proposed transmission, which is a promising structure to achieve swift and smooth gearshift.

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Design, modelling and estimation of a novel modular multi-speed transmission system for electric vehicles

Cited by 30 publications

References 19 publications

Gear Ratio Optimization along with a Novel Gearshift Scheduling Strategy for a Two-Speed Transmission System in Electric Vehicle

Gear Ratio Optimization along with a Novel Gearshift Scheduling Strategy for a Two-Speed Transmission System in Electric Vehicle

A topology-change model of multi-speed transmissions in electric vehicles during gear-shifting

Modelling, Analysis and Simulation of a Novel Automated Manual Transmission with Gearshift Assistant Mechanism

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