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연료량 변조 방법에 의한 MPI 엔진의 산소센서 피드백 제어
박경석(Kyoung Seok Park),고상근(Sangken Kauh) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the A/F ratio control system which depends on the oxygen sensor, the algori thm of the Jump-Ramp control has been used generally. But this method has limitations in increasing the frequency of the A/F ratio oscillation which is necessary to maximize the convening efficiency of the Three- Way Catalyst. This study suggests another feed-back control method in which the fuel metering modulation is involved. By using the fuel metering modulation method, the results show that the performance of the fuel metering modulation method is better than that of Jump-Ramp control method in reducing the steady-state error of the A/F ratio. An additional benefit is that the frequency and amplitude of the A/F ratio txtent are adjustable to some extent<br/>
박경석(Kyoung Seok Park),박진일(Jinil Park),고상근(Sangken Kauh) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
This paper presents a programming technique for lhe engine control unit using the real lime as. The software of the engine control unit is composed of one ISR and six tasks.<br/> In engine control. some tasks must be executed at the very lime when the engine requires. The real lime as plays a role of the scheduler. so enables to change tasks very fast when<br/> the system requires. Using the real time as. the convenience of the programing and the efficiency of the usage of CPU have been enhanced.
액체 금속의 상변화와 유연 기판의 탄성 변형을 활용한 고해상도 액체 금속 패터닝
김도윤(Doyoon Kim),윤용(Young Yoon),고상근(Sangken Kauh),이정철(Jungchul Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Recently, eutectic gallium indium (EGaIn) has been actively investigated towards stretchable and wearable electronic devices with the aid of high fluidity, high electrical conductivity and low toxicity. However, high surface tension along with s pontaneous oxidation makes it difficul t to realize fine patterning below ~10 μm, thus physical molding into an elastomeric mold is thought to be a unique solution. Here, we present a novel manufacturing technique that enables EGaIn patterns of single-digit micrometer width without using a guide mold for the first time. First, a custom directing printing setup is constructed with a laser displacement sensor, a 3-axis motorized stage, and an electronic pressure regulator to enable continuous and uniform printing of EGaIn by feedback control of the distance between the dispensing needle and the substrate. With the custom direct printing setup, a 120 μm wide linear pattern is printed on a Ecoflex<SUP>TM</SUP>, platinum catalyzed silicone elastomer. To enable a single-digit micrometer pattern, the initial printed line is stretched, frozen with deionized (DI) water, and then transferred to an unstretched Ecoflex substrate. Upon gentle heating after the pick -and-place of the EGaIn line frozen with DI water, only the stretched EGaIn line is left on the new Ecoflex substrate. The aforementioned pick-and-place transfer of the stretched EGaIn frozen with DI water is cascaded multiple times until a target wi dth is reache d. With the propose d i dea, a 2 μm wi de linear pattern, 60-fold reduction with respect to the initial dimension, is obtained. For practical applications, strain and pressure s ensors are demonstrated with width-reduced EGaIn patterns.
전자유도법을 이용한 피스톤 온도 측정과 디지털가변저항을 이용한 센서검출법
이호현(Hohyun Lee),방현욱(Hyunwook Bang),고상근(Sangken Kauh),김승일(Seungil Kim),박승일(Seungil Park) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Method of 'Electromagnetic Induction' has many benefits of other methods as 'Linkage Methode', 'Templog' and 'piston telemetry' etc. It is as precise as linkage method and as accurate as piston telemetry. In addition to that, It can measure multi points per piston and multi cylinders by real time. And we can save time and man power contrast to other method. But 'Electromagnetic Induction' method needs to calibrate each sensor parts, that takes place of many portion of preparatory period. In this paper we introduce calibration method which use 'Digital Variable Resistor'. If measurement equipment. primary & secondary coil sensor is prepared and some temperature sensor whose specification is known already is prepared too. you can prepare everything which is need to measuring piston temperature in very short period.