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International Journal of Automotive Technology > Volume 23(2); 2022 > Article
International Journal of Automotive Technology 2022;23(2): 555-565.
doi: https://doi.org/10.1007/s12239-022-0051-9
Jae Yong Park1,3, Sungsoo Na1, Hyunsoo Cha2, Kyongsu Yi2
1Korea University
2Seoul National University
3Hyundai Motors Company
PDF Links Corresponding Author.  Kyongsu Yi , Email. kyi@snu.ac.kr
This paper presents a direct yaw moment control (DYC) for improved lateral stability and agility at severe cornering. A test vehicle was developed for research on highly weighted vehicles such as fully EVs by equipping IWM (In -Wheel Motor) on the f ron t wheels an d eLSD (Electron ic Limited S lip Differen tials) o n the rear axle. The con trol objective is to drive an e4WD system by allocating the torques of four wheels independently. The IWM system on the front wheels provides the agility of yaw behavior, and eLSD on the rear wheels inhibits the yaw behavior at the termination of the turning process. The proposed DYC is composed of a supervisory controller, top-level controller, and bottom-level controller. The supervisory controller determines target behavior based on the desired understeer gradient and desired yaw rate for front and rear torque-vectoring control. The top-level controller calculates a desired yaw moment for the target behavior. The bottom-level controller converts the desired yaw moment to the torque inputs for 4WD torque vectoring. The suggested algorithm was verified through computer simulations and vehicle tests. The vehicle test results present that the integrated control of the front and rear torque-vectoring can improve the handling performance of the test vehicle.
Key Words: In-Wheel Motor (IWM), Electronic Limited Slip Differentials (eLSD), Direct Yaw Moment Control (DYC), Torque-Vectoring, Under-Steer (U/S), Over-Steer (O/S), Wheel behavior sensor, Wheel states estimator
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