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오병걸(Byounggul Oh),오승석(Seungsuk Oh),박영섭(Yeongseop Park),이강윤(Kangyoon Lee),선우명호(Myoungho Sunwoo) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.2
The purpose of this study is to develop a piezo injector driver for common-rail direct injection diesel engines. In this research, we analyzed the electrical and mechanical characteristics of the piezo actuator through experiments. Current flow and charging voltage of the piezo injector are controlled by the PWM signal of variable duty ratio in order to realize both fast response and low peak current. The optimal switching duty ratio was designed by modeling and analyzing of the piezo driver circuit. In order to avoid resonance and unacceptably long settling time, appropriate frequency range of the PWM signal was derived based on the driver circuit model. The developed injector driver was validated by experiments under various fuel rail pressure, injection duration, and charging voltage.
인공신경망을 이용한 가변 기구 터보차저의 터빈 질량유량 모델링
박영섭(Yeongseop Park),오병걸(Byounggul Oh),이민광(Minkwang Lee),선우명호(Myoungho Sunwoo) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.8
이 논문에서는 인공신경망을 이용하여 가변 기구 터보차저(VGT)의 터빈 질량유량을 추정하는 모델을 제안하고자 한다. 터빈 질량유량을 추정하기 위한 모델의 입력변수는 VGT 베인 개도량, 엔진 회전속도, 배기매니폴드 압력, 배기매니폴드 온도, 터빈 출구 압력이 사용되었으며, 터빈 입구 유효 단면적을 추정하는 부분에 인공신경망을 적용하였다. 실험을 통하여 이 논문에서 제안한 모델의 터빈 질량유량 추정 성능을 검증하였으며, 터빈 맵을 이용하여 추정한 결과와 비교를 통하여 제안한 모델의 우수성을 확인하였다. In this paper, we propose a turbine mass flow rate model for a variable geometry turbocharger (VGT) using an artificial neural network (ANN). The model predicts the turbine mass flow rate using the VGT vane position, engine rotational speed, exhaust manifold pressure, exhaust manifold temperature, and turbine outlet pressure. The ANN is used for the estimation of the effective flow area. In order to validate the results estimated by the proposed model, we have compared estimation results with engine experimental results. The results, in addition, represent improved estimation accuracy when compared with the performance using the turbine map.
이강윤(Kangyoon Lee),김대경(Daekyung Kim),오병걸(Byounggul Oh),선우명호(Myoungho Sunwoo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In this paper, we proposed a new boosting device for internal combustion engines using dynamic pressure. The boosting device is inspired by the concept of boost converter in electrical system. The proposed boosting device is composed of a fan blowing air into an intake manifold, a bypass, and a bypass valve. By using the fan and the bypass valve, kinetic energy of a working fluid is translated into pressure energy. Consequently, the intake manifold pressure is increased due to the pressure energy. The feasibility of the proposed boosting device was validated by a commercial 1-D engine model, GT-power.
대학생 자작자동차대회 차량을 위한 단기통 125㏄ 엔진 전자제어시스템 개발
강형석(Hyungsouk Kang),박영섭(Yeongseop Park),오병걸(Byounggul Oh),이강윤(Kangyoon Lee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The annual off-road vehicle race to undergraduate students, the official title ‘KSAE Baja’, is held by KSAE. Hanyang University Team ‘RACE’ participates in ‘KSAE Baja’ every year. The regulation of the race restricts the engine to 125㏄ single cylinder engine which is made in Korea. Most of conventional 125㏄ engine uses carburetor and capacitive discharge ignition system. The conventional engine system cannot react accurately to driver’s input command. However, fast and accurate response of the engine is an important factor in race. In addition, high power output of the engine is also a significant issue. Engine management system, therefore, is required to improve engine performance. In this paper, we developed an engine management system for the conventional 125㏄ single cylinder engine. In order to control fuel injection and ignition, we added sensors and actuators to the conventional engine. Besides, an electronic control unit was designed to drive the engine. The developed engine management system was verified with experiments under various operating conditions using dynamometer.