Advances in Automobile Engineering
Open Access
ISSN: 2167-7670
+44 1300 500008
ISSN: 2167-7670
+44 1300 500008
Kangneoung Lee, Hyunjong Ha, Sungbae Jeon and Hyunsoo Kim
Sungkyunkwan University, Korea
Posters & Accepted Abstracts: Adv Automob Eng
In this study, an in-wheel motor torque control strategy was proposed for a 4-wheel drive in-wheel type electric vehicle by considering the rollover risk, vehicle driving and handling performance. LTR (lateral load transfer ratio), which is the rollover index, is significantly relevant to the vehicle lateral acceleration. For reducing the rollover risk, the vehicle lateral acceleration must be decreased. Lateral acceleration depends on the vehicle speed and turning radius. These factors can be controlled by the in-wheel motor torque control. To develop the in-wheel motor torque control strategy, the LTR was calculated from the vehicle dynamics to estimate the rollover. Threshold of LTR was introduced using the vehicle specifiations. LTR error which is the difference between the threshold of LTR and actual LTR was used to control the front and rear motor torques. Motor control strategy was composed of two parts: First, to reduce the vehicle velocity, output torque of the in-wheel motors at all wheels were reduced depending on the amount of the LTR error. In addition, co-operative braking control was performed using the electro-hydraulic braking system. Second, to improve the handling performance, additional output torque control of the front in-wheel motors were carried out. Through the simulation results, it was found that the rollover risk was decreased as much as 30% by the in-wheel motor torque control compared to that of no control.
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