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전동식 조향시스템의 EMS 검증시험에 관한 각도-인덱스 방식의 실시간 분석 알고리즘 연구
오세룡(SeRyong Oh),최대근(DaeGeun Choi),임태서(TaeSeo Lim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Power steering system assists the driver of an automobile in steering by directing a portion of the vehicle’s power to traverse the axis of one or more of the roadwheels. There are two types of power steering systems-hydraulic and electric.(A hydraulic-electric hybrid system is also possible) A hydraulic power steering (HPS) uses hydraulic pressure supplied by an engine-driven pump to assist the motion of turning the steering wheel. Electric power steering (EPS) is more efficient than the hydraulic power steering, since the electric power steering motor only needs to provide assistance when the steering wheel is turned, whereas the hydraulic pump must run constantly. But as EPS has high power circuit to generate high torque of the motor, it has Electro-Magnetic Susceptibility(EMS) weakness characteristic. Therefore EMS characteristic of EPS system is critical point. Generally, EMS validation test is performed manually using test JIG and the result is assessed by quick-look analysis method. In the paper, new criteria(real-time analysis algorithm) and validation auto-test model about EMS validation test is suggested. Using the Degree-Index method and test JIG, the EMS validation test is performed automatically and the result is assessed by real-time analysis algorithm.
EPS 시스템의 On-center Handling 특성 개선
김성규(Seongkyu Kim),정대종(Daijong Chung),김정탁(Jungtak Kim),최대근(Daegeun Choi) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
The EPS system is superior to conventional hydraulic power steering system in the aspect of fuel economy,<br/> environment and assembly convenience but the increase of friction and inertia may cause unnatural steering feeling<br/> especially in on-center range. Therefore, EPS has its own special control logic to compensate it.<br/> In this paper, the study for an objective evaluation method with steering angle, steering torque, lateral acceleration<br/> and yaw rate was addressed to quantify on-center handling of EPS system. Based on this method, the control factors<br/> that affect on-center handling performance was analyzed and test results show that on-center handling can be<br/> improved with adequate returnability control, damping compensation and inertia compensation.