Torque distribution strategy for a front and rear wheel driven electric vehicle

Yuan, Xianbao; Wang, Jiabin; Colombage, Kalhana

doi:10.1049/cp.2012.0316

Cited by 35 publications

(26 citation statements)

References 6 publications

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“…This is in agreement with other research e.g. [9] which sought to improve energy efficiency by splitting the torque demands between front and rear actuators. For motors with more a pronounced variation of efficiency throughout the torque-speed space, it is likely that even greater power loss savings could be made.…”

Section: Discussionsupporting

confidence: 93%

Reducing the motor power losses of a four-wheel drive, fully electric vehicle via wheel torque allocation

Pennycott

Novellis

Sabbatini

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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Individually-controlled electric motors provide opportunities for enhancing the handling characteristics and energy efficiency of fully electric vehicles. Online power loss minimisation schemes based on electric motor efficiency data may, however, be impractical for real-time implementation due to the heavy computational demand. In this paper, the optimal wheel torque distribution for minimal power losses in the electric motor drives is evaluated in an offline optimisation procedure and then approximated using a simple function for online control allocation. The wheel torque allocation scheme is evaluated via a simulation approach incorporating constant speed driving at constant speed, ramp and step steer manoeuvres. The energy efficient wheel torque allocation scheme provides motor power loss reductions and yields savings in the total power utilisation compared to a simpler method in which the torques are evenly distributed across the four wheels. The method does not rely on complex online optimisation and can be applied on real electric vehicles in order to improve efficiency and thus reduce power consumption during different manoeuvres.

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Section: Discussionsupporting

confidence: 93%

Reducing the motor power losses of a four-wheel drive, fully electric vehicle via wheel torque allocation

Pennycott

Novellis

Sabbatini

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…Literature [17] studies the energy consumption model of permanent magnet synchronous motor (PMSM) and designs the optimal distribution strategy. But the motor is just tested on the test bench.…”

Section: Torque Distribution Strategy Based On the Motor Model Litermentioning

confidence: 99%

“…In [19,20], the dual-motor drive system is proposed to analyze the torque distribution problem based on the loss model. The correctness of the conclusions is verified by the simulation of the circulating conditions.…”

Section: Torque Distribution Strategy Based On the Motor Model Litermentioning

confidence: 99%

Review on torque distribution strategies for four in-wheel motor drive electric vehicles

Deng

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Electric vehicle (EV) with four independent in-wheel motor is over-actuated systems. The wheel torque distribution can be realized through a large number of methods to satisfy the economic and safety demands. This paper aims at providing a review of the economic-based torque distribution strategies, safety-based torque distribution strategies and coordination control of torque distribution strategies based on both safety and economy. This paper not only provides a comprehensive analysis of torque distribution strategies for in-wheel-motor EVs but also puts forward the future and emphasis of future study, which will promote the development of torque distribution strategy with safety and economy for in-wheel-motor drive EVs. IntroductionRecently, as a new energy and environment-friendly vehicle, the in-wheel motor drive electric vehicle (EV) has been rapidly developed thanks to its high efficiency, non-pollution, low noise and so on. Differing from the traditional driving manner, the in-wheel motor drives the wheel directly. Thus, the in-wheel motor drive EV has unique advantages, such as simple and compact structure, high energyefficiency, and independent control of the torque [1]. Studying the torque distribution of the drive system is of great significance to the research of four in-wheel motor drive (4IWMD) EV.For the 4IWMD EV, each driving wheel adopts a driving motor as the driving source. And, there is no direct restriction between the mechanical parts between the power sources. The coordinated operation between the driving wheels must be ensured in the control strategy and control method. The torque coordinated control technique is how to control the torque of each driving wheel in order to achieve the goal of stable and safe driving. The wheel torque distribution mainly depends on the working position of each wheel motor under the same torque demand. And, the efficiency of motor and motor controller will be different under different torque demand. The wheel torque distribution also affects the steering characteristics of the vehicle, including the indirect influence of the wheel torque distribution and the direct influence of the left and right wheel torque distribution. The method of moment distribution has an influence on the economy and operation stability of the vehicle, so it is necessary to study both energy saving and safe wheel torque distribution to improve the vehicle's comprehensive performance [2].A large number of literature studied on torque distribution of in-wheel-motored EVs have appeared, the existing articles emphasize on discussing the torque distribution strategy. However, there is no review about torque distribution used in EVs. This study intends to fill this gap. In addition, torque

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“…However, the energy consumption only led by unnecessary wheel spin can be reduced. Yuan [21] utilized the independent characteristics of traction motors to develop a torque distribution method for decreasing EV energy. Furthermore, quite a few cost function-based traction allocation approaches have been carried out.…”

Section: Introductionmentioning

confidence: 99%

Integrated Traction Control Strategy for Distributed Drive Electric Vehicles with Improvement of Economy and Longitudinal Driving Stability

Zhang

Göhlich

2017

Energies

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This paper presents an integrated traction control strategy (ITCS) for distributed drive electric vehicles. The purpose of the proposed strategy is to improve vehicle economy and longitudinal driving stability. On high adhesion roads, economy optimization algorithm is applied to maximize motors efficiency by means of the optimized torque distribution. On low adhesion roads, a sliding mode control (SMC) algorithm is implemented to guarantee the wheel slip ratio around the optimal slip ratio point to make full use of road adhesion capacity. In order to avoid the disturbance on slip ratio calculation due to the low vehicle speed, wheel rotational speed is taken as the control variable. Since the optimal slip ratio varies according to different road conditions, Bayesian hypothesis selection is utilized to estimate the road friction coefficient. Additionally, the ITCS is designed for combining the vehicle economy and stability control through three traction allocation cases: economy-based traction allocation, pedal self-correcting traction allocation and inter-axles traction allocation. Finally, simulations are conducted in CarSim and Matlab/Simulink environment. The results show that the proposed strategy effectively reduces vehicle energy consumption, suppresses wheels-skid and enhances the vehicle longitudinal stability and dynamic performance.

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Torque distribution strategy for a front and rear wheel driven electric vehicle

Cited by 35 publications

References 6 publications

Reducing the motor power losses of a four-wheel drive, fully electric vehicle via wheel torque allocation

Reducing the motor power losses of a four-wheel drive, fully electric vehicle via wheel torque allocation

Review on torque distribution strategies for four in-wheel motor drive electric vehicles

Integrated Traction Control Strategy for Distributed Drive Electric Vehicles with Improvement of Economy and Longitudinal Driving Stability

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