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후륜조향 시스템 “RWS”적용을 통한 차량 조종 안정성 개선
유승범(Sungbem Yoo),백훈열(Hoonyeol Baek),최광수(Kwangsoo Choi) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
The front steering system is a main trend of vehicle steering systems. This system is only upon the lateral force which is generated by front tires and then the force makes yaw moment that achieved driver’s intend. This is convenient and effective steering system at normal speed but, at high speed, this system reaches the limit especially sudden steering and braking ; under, over steering, fish tail phenomenon. VDC and etc. auxiliary brake systems make up for this limit. But once the vehicle was lost its control, these auxiliary systems didn’t fulfill its function. Therefore, for improving stability of vehicle behavior and reducing fundamental steering error, developing rear wheel steering system is necessary. In this paper, we has conduct a design from each part to the system and verify its performance.
DFSS방법론을 사용한 RWS 원점복원 로직에 대한 연구
유승범(Sungbem Yoo),임희규(Heekyu Lim),백훈열(Hoonyeol Baek) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
The rear wheel steering system basically operates by external signal, receiving the steering angle and the vehicle speed input. If there is a problem with the external signal of the rear wheel steering, that will be able to change its state. One is immediate stop and the other is stop after move to neutral. In the case of stopping immediately, since it is fixed at a specific rear wheel angle, the front wheel angle must be rotated by the rear wheel angle in order to make a straight advance. However, if the vehicle moves to the neutral position, the driver will feel discomfort because yaw velocity is changed. It is necessary to decide how to set the time to reduce driver discomfort during traveling home. We used the Taguchi methodology of DFSS to derive the appropriate time without the driver’s discomfort.