Abstract
A 6 degrees of freedom shimmy model for four in-wheel motors independent drive electric vehicle with independent front suspension is established, and numerical analysis and simulation are used to study the dynamic response of vehicle shimmy. The influence of electric vehicle driving system on shimmy is studied by comparing with fuelengined vehicle, and the influence of vehicle structural parameters such as the caster angle, the inclination angle of front suspensions and the centre of gravity of vehicle on shimmy are studied too. It shows that as the in-wheel motor in drive system increases the weight of wheel, the amplitude of each degree of freedom in electric vehicle are larger than in fuel-engined vehicle when vehicle shimmies. The influence of the caster angle and the centre of gravity of vehicle on vehicle shimmy is obvious, but the inclination angle of front suspension have little influence.
Highlights
The new energy vehicle, represented by electric vehicle (EV) whose core is electric driven system, has become one of the commanding points of vehicle research and development and even industrial competition all over the world
Because in-wheel motor is mounted in the wheel of EV, the weight of wheel and the moment of inertia of wheel in all directions in EV is increased in comparison with the fuel-engined vehicle (FEV), and when vehicle are powered by power batteries instead of engines, its weight and center of gravity (COG) are changed
Based on the 6 degrees of freedom (DOF) model of FIMID EV front wheel shimmy, the shimmy problems of EV are studied by numerical analysis and simulation, which is compared with that of FEV
Summary
The new energy vehicle, represented by electric vehicle (EV) whose core is electric driven system, has become one of the commanding points of vehicle research and development and even industrial competition all over the world. Structure with independent suspension and driven by in-wheel motors or wheel-side motors independently is considered to be the most effective configuration of EV with the essential advantages of electric drive, and has attracted the attention from the global EV industry.[1] -[3] Vehicle shimmy is a continuous vibration of the steering wheels around they respective kingpin when vehicle travels on flat road. As early as the 1930s, some researchers began to study the problem of vehicle shimmy.[4] In recent decades, researchers have carried out extensive research on the problem of vehicle shimmy, and a series achievement have been made.[5] -[8]. The object of research on the problem of vehicle shimmy is mainly traditional fuel-engined vehicle (FEV), and the problem of front wheels shimmy in EV has hardly been raised specially. Because of the introduction of driving motors and power battery, the structures of EV and FEV are extremely different. (FIMID) EV and the influence of vehicle parameters on EV shimmy will be studied in this paper
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