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고상진(Sangjin Ko),이현철(Hyuncheol Lee),민승기(Seunggi Min),유영선(Youngsun Yoo) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
In this paper, control algorithms of electric power steering (EPS) system is investigated to improve vehicle lateral stability. EPS system has been growing rapidly and then enables to apply variable additional functions as well as steering torque assist – basic EPS function. Commonly used lateral stability control method is based on brake control. Integrated chassis control system between EPS and ESC (brake control) is well known system for lateral stability control. The proposed control algorithms is dependent on only EPS system. The control algorithm enables to help and a driver control more safely by adjusting driver steering torque. The control algorithms consist of two parts. The one is vehicle state detection algorithm and the other is to generate additional EPS output torque to adjust driver steering torque. The proposed algorithms are expected to improve lateral stability of small car without active brake control system and can be also helpful trailer hitched vehicle by preventing more severe handling by a driver. The test results showed that driver steering torque is adjusted appropriately in severe situations and a driver controls a vehicle more safely by the proposed algorithms.