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Lee, Jae Kil
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Development of Compensation Logic for EPS in Limit Cornering Condition

Hyundai & Kia Corporation-Hanseung Lee, Jae Kil Lee
Published 2019-03-25 by SAE International in United States
This paper proposes steering compensation logic of Electric Power Steering (EPS) system in limit cornering condition. Steering wheel torque is decided by relationships between internal forces and external forces. The internal forces are steering frictions and assist force. The external forces are transferred from tire forces through kingpin axis and steering system. Kingpin moments are analyzed by using vector analysis and tire model. Relations of these forces are defined and used to explain steering disturbance by comparing simulation results and measurement data. Using these relationships, the proposed compensation logic is designed. This logic is verified by simulation models and validated in proto type vehicle.
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The Development of FR-Based 4WD Multi-Link Suspension

Hyundai-Kia R&D Center-DaeWoo Jung, Jae Kil Lee, Byung-Kyu Lee, Seon Pyung Kim
Published 2013-04-08 by SAE International in United States
In this paper FR (Front Engine, Rear wheel Drive) based 4WD 5-link independent suspension systems are introduced which are developed for low friction road stability in the winter. The arrangement of the lower control arm of the newly developed suspensions has been changed in order to correspond to 4WD layout. And basic performance is satisfied due to the addition of the driveline. Also NVH (Noise, Vibration and Harshness) performance has improved, to enhance the comfort of the vehicle
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The Development of Multi-link Suspensions for Hyundai Genesis

Hyundai Motor Company-Seon Pyung Kim, Jae Kil Lee, Young Ho Oh, Un Koo Lee
Published 2009-04-20 by SAE International in United States
In this paper, front and rear 5-link independent suspension systems are introduced which are developed for the Hyundai Genesis. The front suspension has two upper links, two lower links, and a tie-rod. In the rear suspension, there are two upper links, a lower link, a trailing link, and a toe control link. The design concepts of front and rear suspension systems are explained, respectively. Also, it is presented how the suspension characteristics are designed and optimized to satisfy the desired performances such as luxurious ride feeling and precise handling.
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Roll Motion Analysis of a Full Vehicle Model Using Screw Theory

Korea Univ.-Jae Kil Lee, Jae Kyung Shim
  • Technical Paper
  • 2006-05-0476
Published 2006-10-22 by Society of Automotive Engineers of Japan in Japan
In this paper, roll behavior of a full vehicle is analyzed using screw axis theory. In this study, roll screw axis is considered as instant screw axis of the vehicle body with respect to ground, which is different from the conventional definition of roll axis. A full-vehicle model is converted into instantaneous equivalent model at each roll step to find roll screw axis. Instant screw axis of wheel relative to ground in symmetric position is assumed to pass through wheel contact point with direction of driving, and it is estimated by finite screw axis of wheel with respect to ground for small roll displacement. Using the proposed method, roll displacement of the vehicle body, wheel contact point variations, and locus of roll screw axis are calculated.