Abstract
This paper presents an in-wheel vibration absorber for in-wheel-motor electric vehicles (IWM EVs), and a corresponding control strategy to improve vehicle ride comfort. The proposed in-wheel vibration absorber, designed for suppressing the motor vibrations, is composed of a spring, an annular rubber bushing, and a controllable damper. The parameters of the in-wheel spring and rubber bushing are determined by an improved particle swarm optimization (IPSO) algorithm, which is executed under the typical driving conditions and can absorb vibration passively. To deal with negative interaction effects between vehicle suspension and in-wheel absorber, a linear quadratic regulator (LQR) algorithm is developed to control suspension damper, and meanwhile a fuzzy proportional-integral-derivative (PID) method is developed to control in-wheel damper as well. Through four evaluation indexes, i.e., vehicle body vertical acceleration, suspension dynamic deflection, wheel dynamic load, and motor wallop, simulation results show that, compared to the conventional electric wheel, the proposed suspension LQR control effectively improves vehicle ride comfort, and the in-wheel absorber exhibits excellent performance in terms of wheel and motor vibration suppression.
Highlights
In recent years, to solve the challenges resulting from the increasing energy crisis and environmental pollution, the electric vehicles (EVs) have been widely developed as an essential part of future efficient and green transportation plans
As a matter of fact, the unsprung mass with the IWMs usually results in harsh vertical negative effects, such as reduction of vehicle ride comfort [4,5,6], deterioration of road friendliness [7], invalidation of suspension control methods [8], and reduction of motor reliability under the large wallop [9,10,11], which have greatly restricted the practical development of IWMEVs
This paper presents an in-wheel vibration absorber for IWMEV and a comprehensive control strategy for an in-wheel absorber and vehicle suspension to improve vehicle ride comfort
Summary
To solve the challenges resulting from the increasing energy crisis and environmental pollution, the electric vehicles (EVs) have been widely developed as an essential part of future efficient and green transportation plans. The rubber bushing absorbed the vibration energy transferred from the road to the motor, reducing the effects of road excitation on motor air gap and improving the vertical dynamics characteristics of the vehicle. Suspended devices, such as rubber bushings, are essentially all just different kinds of passive vibration absorbers. To overcome the drawbacks mentioned above, in this paper an integrated electric wheel with a controllable in-wheel vibration absorber is proposed to improve the vehicle ride comfort of an IWM. The proposed in-wheel vibration absorber, composed of a spring, an annular rubber bushing, and a controllable damper, aims to reduce the vertical wallop of the IWM.
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