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단기통 대형 디젤 엔진 용 전기-유압식 가변 밸브 작동기 개발
박성산(Stephen Sungsan Park),배충식(Choongsik Bae) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
As the emission regulations are getting stricter, demand for advanced technologies, which can improve exhaust emissions and fuel economy at the same time, are getting stronger. Variable valve actuation technology is one of the advanced technologies, which receives worldwide attention. Electro-hydraulic valve actuator has a potential to control the engine valve independent of the crank shaft, consequently gives an additional degree of freedom to enhance trade-off between exhaust emissions and fuel economy. In this study, electro-hydraulic valve actuator was developed with the purpose of being installed on a single cylinder heavy-duty diesel engine. Required maximum operating speed, landing velocity and lift of the valve actuator were selected based on the research engine. 0-D and 1-D hydraulic simulation program (AMESim) was used to determine the core dimensions, such as diameter of orifices and height and diameter of the hydraulic snubber, which satisfied the requirements. Electro-hydraulic valve actuator was manufactured and tested based on simulation results.
단기통 대형 디젤 엔진 용 전기-유압식 가변 밸브 작동기의 거동 특성
박성산(Stephen Sungsan Park),배충식(Choongsik Bae) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Demand for advanced technologies, that can improve exhaust emissions and fuel economy simultaneously, is getting stronger as the emission regulations are getting stricter. Variable valve actuation technology is one of the advanced technologies, which receives more attention increasingly. Electro-hydraulic valve actuator, which is a sort of camless valve actuator, has a potential to control the engine valve independently to the crank shaft rotation. As a result, additional degree of freedom can lead to enhancement of trade-off between exhaust emissions and fuel economy. In this study, electro-hydraulic valve actuator was developed with the purpose of being installed on a single cylinder heavy-duty diesel engine. Linear variable differential transformer was installed on top of the valve rod to measure the valve lift. Valve lift was acquired while supply voltatge, trigger duration for control valve and oil pressure were swept. Results show that bottleneck exists which limits the maximum valve velocity below specification.
연료분무 및 연소 3 : 디젤 인젝터의 유압유량 차이에 따른 분무 특성
박성산 ( Stephen Sungsan Park ),김동훈 ( Dong Hoon Kim ),심의준 ( Eui Joon Shim ),김득상 ( Duk Sang Kim ),배충식 ( Choong Sik Bae ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
In this study, spray characteristics of two diesel injectors with same nozzle holes number and spray cone angle but different hydraulic flow rate was acquired. With short injection duration, the injector with hydraulic flow rate of 380 cc showed higher injection quantity compared to the injector with hydraulic flow rate of 420 cc. However, when the injection duration was prolonged, the injection quantity trend changed. The injection quantity trend was explained with injection rate results. Spray penetration and spray angle was measured in three conditions; atmospheric, 3 MPa pressurized in constant volume chamber and evaporating condition in optical engine. The injector with hydraulic flow rate of 380 cc with atmospheric condition showed the longest spray penetration and the narrowest spray angle.
가솔린 직분식 압축착화 엔진 저부하 영역 디젤/가솔린 분무의 쉴리렌, 쉐도우그래프, 미산란법적 가시화
박성산 ( Stephen Sungsan Park ),김동훈 ( Donghoon Kim ),배충식 ( Choongsik Bae ) 한국액체미립화학회 2015 한국액체미립화학회지 Vol.20 No.3
In this study, three visualization methods, Schlieren, Shadowgraph, and Mie-scattering, were applied to compare diesel and gasoline spray structures. Fuels were injected into a high pressure/high temperature constant volume chamber under the same ambient pressure and temperature condition of low load in gasoline direct injection compression ignition (GDCI) engine. Two injection pressures (40 and 80 MPa), two ambient pressures (4.2 and 1.7 MPa), and two ambient temperatures (908 and 677 K) were use. The images from the different methods were overlapped to show liquid and vapor phases more clearly. It was found that the gasoline fuel is more appropriate to form a lean mixture.