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원격 가속도 감지 방식에 의한 측면 에어백 제어 시스템
박서욱(Park Seo-Wook),김현태(Kim Hyun-Tae) 한국자동차공학회 1999 한국자동차공학회 학술강연 논문집 Vol.1999 No.9
Accident statistics shows that the portion of fatal occupant injuries due to side impacts is considerably high. The side impact usually leads to a severe intrusion of side structure into the passenger compartment. Furthermore, the safely zone for the side impact is relatively small compared to the front impact. These kinds of physics for side impact frequently result in a fatal injury for the occupant. Therefore, NHTSA and EEVC are trying to strengthen the regulation for the occupant protection against side impact. Both the regulation and recent market trends are asking for an installation of side airbag. There are several types of system configuration for side impact sensing. In this paper, we adopt the acceleration-based remote sensing method for the side airbag control system. We mainly focus on the development of hardware and crash discrimination algorithm of remote sensing unit. The crash discrimination algorithm needs fast decision of airbag firing especially for high-speed side impact such as FMVSS 214 and EEVC tests. It is also required to distinguish between low-speed lire and no-lire events. The algorithm should have a sufficient safety margin against any misuse situation such as hammer blow, door slam, etc. This paper introduces several firing criterions such as acceleration, velocity and energy criterions that use physical value proportional to crash severity. We have made a simulation program by using Matlab/Simulink to implement the proposed algorithm. We have conducted an algorithm calibration by using the real crash data for 2.500cc medium-sized vehicle. The crash performance obtained by the simulation was verified through a pulse injection method. It turned out that the results satisfied the system requirements well.
[안전부문] 전자식 이축 가속도 센서를 이용한 충돌 판정 알고리즘
박서욱(Seo-Wook Park),이재협(Jae-Hyeob Lee),전만철(Man-Chel Jeon),서성환(Sung-Hwan Seo),이훈상(Hoon-Sang Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
In today's vehicle structure design, an intensive requirement for occupant safety has to be considered. In order to acquire good points from NCAP requirement, the vehicle structure of the crush zone has to be designed to have a good energy absorption characteristic while avoiding any nonlinear local deformation. On the other hand, the passenger compartment should have an enough stiffiness to endure an intrusion against occupants. Furthermore, a recent market trend asks for vehicle safety requirements against a high-speed offset barrier crash such as EU Directive 96/97 EC, IIHS offset test Therefore, vehicle crush zone is sometimes needed to be reinforced by adding sub-frame in order to avoid an excessive deformation. That kind of vehicle structure design trend results in a relatively monotonic crash pulse at non-crush zone sensor, which might cause a poor crash discrimination between fire and no-fire events.<br/> In this paper, we introduce a crash discrimination algorithm using electronic dual-axis accelerometer in order to enhance the robustness of algorithm performance. The proposed method uses a crash signal in lateral direction(Y-axis) as well as in longitudinal direction(X-axis). A crash severity measure obtained from Y-axis signal is used to improve the discrimination between fire and no-fire events. The result using the proposed measure shal1 be logically ORed n1th the result from X-axis algorithm part Simulation and pulse injection tests have been conducted to vcri1Y the performance of proposed algorithm by using real crash data of 2,000cc passenger vehicle.<br/>
[전기 및 전자부문] 안전벨트 착용 상태 감지에 의한 이중 임계치 에어백 제어 알고리즘
박서욱(Seo-Wook Park),전만철(Man-Cheol Jeon) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A vehicle restraint system has to meet not only several regulations such as FMVSS 208, EU Directive 96/97 EC but also NCAP requirement. In order to satisfy those requirements, the activation of restraint system has been usually designed to be somewhat sensitive to the crash event. Unfortunately, several accidents due to airbag induced injury at relatively low speed were frequently reported these days in US and domestic market.<br/> This paper proposes a new concept to improve the current restraint system performance. The proposed method termed "dual threshold algorithm" shall control airbag and belt-pretensioner by utilizing seat-belt status. The algorithm can allow the activation of restraint system to be less sensitive for belted occupant compared to unbelted condition. The algorithm shall also use additional informations from passenger presence detection(PPD) sensor and sating sensor to optimize the performance of restraint system. A simulation has been conducted to verify the performance of proposed algorithm by using real crash data for 1,800cc passenger vehicle.