Comfort and Safety Enhancement of Passenger Vehicles with In-Wheel Motors

Rojas, Andrés Eduardo Rojas; Niederkofler, Haymo; Willberger, Johann

doi:10.4271/2010-01-1146

Cited by 13 publications

(4 citation statements)

References 25 publications

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“…Additional boundaries in this case are also set by the tyre stiffness. These arguments show that a tuning of the passive suspension has a limited applicability to improve the ride quality of the EV with IWMs that was also confirmed by some research works [10]. These facts motivated further developments and studies for EV ride dynamics, which led to active ride control by means of IWM torque allocation.…”

Section: Introductionmentioning

confidence: 53%

Ride Blending Control for Electric Vehicles

Ricciardi

Ivanov

Dhaens

et al. 2019

WEVJ

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Vehicles equipped with in-wheel motors (IWMs) feature advanced control functions that allow for enhanced vehicle dynamics and stability. However, these improvements occur to the detriment of ride comfort due to the increased unsprung mass. This study investigates the driving comfort enhancement in electric vehicles that can be achieved through blended control of IWMs and active suspensions (ASs). The term “ride blending”, coined in a previous authors’ work and herein retained, is proposed by analogy with the brake blending to identify the blended action of IWMs and ASs. In the present work, the superior performance of the ride blending control is demonstrated against several driving manoeuvres typically used for the evaluation of the ride quality. The effectiveness of the proposed ride blending control is confirmed by the improved key performance indexes associated with driving comfort and active safety. The simulation results refer to the comparison of the conventional sport utility vehicle (SUV) equipped with a passive suspension system and its electric version provided with ride blending control. The simulation analysis is conducted with an experimentally validated vehicle model in CarMaker® and MATLAB/Simulink co-simulation environment including high-fidelity vehicle subsystems models.

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Section: Introductionmentioning

confidence: 53%

Ride Blending Control for Electric Vehicles

Ricciardi

Ivanov

Dhaens

et al. 2019

WEVJ

View full text Add to dashboard Cite

show abstract

“…It is known that this optimization contains four variables and two objective functions. According to the orthogonal test rule [28], the orthogonal experiment table L 8 (2 7 ) is set up. e first five lists of the table are selected to arrange the orthogonal experiment.…”

Section: Description Of the Game Equilibrium Optimizationmentioning

confidence: 99%

“…In order to suppress the in-wheel vibration and improve vehicle ride comfort, the in-wheel motor in [6] was considered as a dynamic vibration absorber, which was isolated from the unsprung mass by using a spring and a damper. A Rojas et al [7] conducted a deep and thorough study on the active and passive suspensions of the in-wheel motor drive cars and the in-wheel motors including the damping suspension devices, and the study results revealed that the half and active suspension system could reduce the unsprung mass vertical vibration acceleration. But it did little improvement in the wheel ground-touching load, while the design of the motor suspension could effectively improve the wheel groundtouching load and the sprung mass vertical vibration acceleration.…”

Section: Introductionmentioning

confidence: 99%

Game-Based Multiobjective Optimization of Suspension System for In-Wheel Motor Drive Electric Vehicle

Tan

Lin

2021

Mathematical Problems in Engineering

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Since the driving motor is embedded in the wheel, the unsprung mass and the wheel rotational inertia of the in-wheel motor drive electric vehicle both increase, which not only affect the vehicle smoothness but also worsen the motor’s working condition due to its own vertical vibration. The evaluation index of in-wheel motor’s vertical vibration is introduced on the basis of vehicle smoothness analysis. The parameters’ optimization of vibration absorber and suspension are carried out, respectively, and the optimization results show the contradictory relationship between smoothness objective and the motor’s vertical vibration acceleration objective. Regarding the contradictory indices of the smoothness and the motor’s vertical acceleration as the objective function, a multiobjective optimization scheme is designed. Then, the orthogonal experimentation and fuzzy clustering method are applied in the multiobjective optimized design based on the game decision analysis, and the Nash equilibrium and cooperative competition game theory are used to optimize the parameters of suspension and vibration absorber. The optimized results verify the game relation between the optimization variables, the game optimization obtains better optimized results than traditional linear weight sum method, and the in-wheel motor functional stability and the vehicle smoothness can be both achieved. Compared with the traditional complex iterative process and the manmade preassurance weight allocation, the game optimization has the advantages of less iterations, faster convergence, and less influence by human experience.

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“…Rojas Rojas et al. 13 presented an ISS, which connects the in-wheel motor to the unsprung mass in a flexible manner. Actually, the structure isolates the driven motor from the unsprung mass.…”

Section: Introductionmentioning

confidence: 99%

A method to eliminate unsprung adverse effect of in-wheel motor-driven vehicles

Nie

Zhuang

Chen³

et al. 2018

Journal of Low Frequency Noise, Vibration and Active Control

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In-wheel motor-driven vehicles are the development trend for future vehicles due to its high energy efficiency and low emission as well as its flexibility to achieve independent steering, driving, etc. However, the weighted wheel of in-wheel electric vehicles involves more unexpected unsprung vibrations, which imposes adverse effect on vehicle ride comfort. In addition, there exists an invariant point around the unsprung resonance frequency in both controlled and uncontrolled suspensions, which greatly limits the elimination of unsprung adverse effect of in-wheel electric vehicles. In this paper, a combined structure is proposed to eliminate the unsprung adverse effect. The structure is composed of the vehicle suspension and a tuned mass damper, which are both controlled by a sliding mode controller, aiming at eliminating the unsprung adverse effect as well as improving ride comfort across the whole frequency spectrum. The tunes mass damper is used to get rid of the constraint of the invariant point. The simulation and hardware-in-theloop results show that the root mean square of the sprung mass acceleration and tire deflection is reduced by 31.2% and 2.2% respectively, which indicates that the proposed method is effective and ride comfort is greatly improved.

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Comfort and Safety Enhancement of Passenger Vehicles with In-Wheel Motors

Cited by 13 publications

References 25 publications

Ride Blending Control for Electric Vehicles

Ride Blending Control for Electric Vehicles

Game-Based Multiobjective Optimization of Suspension System for In-Wheel Motor Drive Electric Vehicle

A method to eliminate unsprung adverse effect of in-wheel motor-driven vehicles

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