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국내도로 환경을 고려한 ACC 시험평가 방법에 관한 연구
김봉주,이선봉,Kim, BongJu,Lee, SeonBong 한국자동차안전학회 2017 자동차안전학회지 Vol.9 No.4
With automobiles sharply increasing worldwide, we are faced with serious social problems such as traffic accidents, traffic jams, environmental pollution, and economic inefficiency. In response, research on ITS is promoted mainly by regions with advanced automotive industry such as the US, Europe, and Japan. While Korea is working to get ahead to take global market through developing and turning into global standards systems related to ASV(Advanced Safety Vehicle), the country is not excellently prepared for such projects. The purpose of ACC is to control the vehicle's longitudinal speed and distance and minimize driver workload. Such a system should be useful in preventing accidents, as it reduces driver workload in the 21st-century world of telematics created by the development of automobile culture industry. In this light, the thesis presents a method to test and evaluate ACC system and a mathematical method to assess distance. Furthermore, for the proposed test and evaluation, theoretical values are tested with vehicle test and a database is acquired, by using vehicles equipped with an ACC system. We proposed the scenarios suitable for the domestic environment and conducted the actual road test. Theoretical evaluation criteria for developing ACC system may be employed and scenario-specific evaluation methods may find their useful application through testing the formula proposed by comparing the database and the mathematical method. and, many companies are expected to utilize the scenario in the developing stage of ACC, and be able to employ as a verification method by harnessing theoretical formula before a road test.
김봉주,이선봉,Kim, BongJu,Lee, SeonBong 한국자동차안전학회 2018 자동차안전학회지 Vol.10 No.2
Currently, sharp increase of car is on the rise as a serious social problem due to loss of lives from car accident and environmental pollution. There is a study on ITS (Intelligent Transportation System) to seek coping measures. As for the commercialization of ITS, we aim for occupancy of world market through ASV (Advanced Safety Vehicle) related system development and international standardization. However, the domestic environment is very insufficient. Core factor technologies of ITS are Adaptive Cruise Control, Lane Keeping Assist System, Forward Collision Warning System, AEB (Autonomous Emergency Braking) system etc. These technologies are applied to cars to support driving of a driver. AEB system is stop the car automatically based on the result decided by the relative speed and distance with obstacle detected through sensor attached on car rather than depending on the driver. The purpose of AEB system is to measure the distance and speed of car and to prevent accident. Thus, AEB will be a system useful for prevention of accident by decreasing car accident along with the development of automobile technology. This study suggests a scenario to suggest a test evaluation method that accords with domestic environment and active response of international standard regarding the test evaluation method of AEB. Also, by setting the goal with function for distance, it suggests theoretic model according to the result. And the study aims to verify the theoretic evaluation standard per proposed scenario using car which is installed with AEB device through field car driving test on test road. It will be useful to utilize the suggested scenario and theoretical model when conducting AEB test evaluation.
EPS의 조향감 개선을 위한 퍼지 마찰 보상 로직 설계
김봉주(BongJu Kim),안성태(Sungtae Ahn),이청신(Cheongshin Lee) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
본 논문의 목적은 EPS의 조향감 개선을 위해 퍼지 로직을 설계 하는데 있다. 우선, 조향감을 저하시키는 요인들 중 정적 마찰력에 대해 정의하고, 조향감을 개선하기 위한 정적 마찰 보상 로직을 설계하는 방법에 대해 설명한다. 설계된 정적 마찰 보상 로직의 출력 토크 성분 중 불필요한 토크 성분은 제거하고, 필요한 토크 성분은 증폭시키기 위해 퍼지 로직을 적용한다. 또한, 원하는 제어 성능을 달성하기 위해 본 논문에서 제안하는 새로운 가중 함수를 퍼지 로직의 입력으로 사용한다. 시뮬레이션을 통해 설계된 퍼지 로직의 출력이 본 연구의 요구 사항을 충족함을 검증하였다.
원자층 제어 PLD를 이용한 산화물 자성 박막 연구의 동향
김봉주(Bongju Kim),김복기(Bog G. Kim) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.4
Recently, there have been considerable interests in various thin film growth techniques with atomically controllable thickness. Among them, atomically controlled pulsed laser deposition (PLD) technique is quite popular. We have developed advanced thin film growth technique using PLD and Reflection high energy electron diffraction (RHEED). Using the technique, the growth of oxide thin films with the precisely controllable thickness has been demonstrated. In addition, our technique can be applied to high quality thin film growth with minimal defect and bulk chemical composition. In this paper, our recent progresses as well as the current research trend on oxide thin films will be summarized.
컬럼 타입 EPS의 토크 리플 저감을 위한 디지털 필터의 설계 기법에 대한 연구
김봉주(Bongju Kim),김성남(Sungnam Kim),안성태(Sungtae Ahn),이청신(Cheongshin Lee) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
The purpose of this paper is a technical methodology of a digital filter for reducing torque ripple in the Column type Electric Power Steering system (C-EPS). It is hard to handle all of the elements, which cause the problem of torque ripple, using only single notch filter, since C-EPS has unstable characteristics such as vibration and divergence. Moreover, the high value of damping ratio of the single notch filter is required in order to reduce the torque ripple. In order to compensate those disadvantages, a technical methodology of a torque ripple reduction digital filter is suggested based upon Kdac engineering study. The suggested digital filter is engineered by combining a LowPass Filter (LPF), HighPass Filter (HPF) and Notch Filter. The effectiveness of the suggested torque ripple reduction filter has been proven by comparative evaluation with single notch filter in the vehicle test.