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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.
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DFSS 기법을 이용한 EPS 소음/진동 인자 분석 및 강건 설계 방안
정태구(Taegu Jung),조기순(Kisoon Cho),정봉구(Bonggoo Jeong),임태서(Taeseo Lim) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Recently, most of the steering system applied to vehicle is the EPS system using a motor. EPS can make the driver comfort and safe by providing proper steering performance on various driving condition. As the role and function of the EPS rises, the necessity of the EPS optimization design will be considered as an important task to increase the vehicle performance and customer satisfaction. But there are many EPS system during development due to mismatch among sub-systems and it causes extra resources such as cost and time. So steering system requires systematic design strategy and also to meet the requirement of functional safety(ISO 26262). Firstly, we analyzed issue histories such as vibration and noise by using DFMEA, then derived factors which influence on EPS system. The scope for each factors was determined by the tuning parameter of the EPS Module, Operation logic, and Performance calibration which are sub-system of EPS. The selected factors were derived by DFSS and were able to come up with a Robust Design for the EPS system by optimizing the main factor.
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