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직접구동 피에조 인젝터의 CRDi 단기통 디젤엔진 연소 특성 분석
정명철(Myungchul Chung),성기수(Gisu Sung),김상명(Sangmyung Kim),이진욱(Jinwook Lee) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.5
In this study, experimental approaching method was applied under and single-cylinder engine to research the performance of direct needle-driven piezo injector (DPI) for CR direct-injection. As key-point factor of this DPI that relies on direct-acting operating of injector needle, unlike conventional hydraulic-servo, its nozzle needle can be directly driven by piezo actuator. Thus, effect of direct-acting injection of DPI on diesel combustion and emission characteristics was investigated under common-rail single-cylinder direct-injection engine, equipped with three different driving mechanism, including indirect-acting solenoid, piezo and DPI system. As main results, it found that a direct-acting piezo injector has higher of IMEP. And it has higher heat release rate during premixed combustion and mixing controlled combustion phase due to its higher heat release, even though nitrogen oxide (NOx) formations were increased slightly.
3개 구동방식(SI, PI, DPI)별 디젤HEV용 인젝터의 분무 특성 비교
( M C Chung ),( G S Sung ),( S M Kim ),( J W Lee ) 한국분무공학회 2014 한국액체미립화학회지 Vol.19 No.1
Performance of DI diesel engine with high-pressure fuel injection equipment is directly related to its emission characteristics and fuel consumption. So, the electro-hydraulic injector for the common-rail injection system should be designed to meet the precise high fuel delivery control capability. Currently, most high pressure injector in use has a needle driven by the solenoid coil energy or the piezo actuator controlled by charge-discharge of output pulse current. In this study, macroscopic spray approaching method was applied under constant volume chamber to research the performance of three different injectors : solenoid, indirect-acting piezo and direct-acting piezo type for CR direct-injection. LED back illumination for Mie scattering was applied on the liquid spray visible of direct-acting piezo injector, including hydraulic-servo type solenoid and piezo-driven injectors. As main results, we found that a direct-acting piezo injector had better a spray tip penetration than hydraulic-servo injectors in spray visualization.
3개 구동방식(SI, PI, DPI)별 디젤HEV용 인젝터의 분무 특성 비교
정명철,성기수,김상명,이진욱 한국분무공학회 2014 한국액체미립화학회지 Vol.19 No.1
Performance of DI diesel engine with high-pressure fuel injection equipment is directly related to its emission characteristicsand fuel consumption. So, the electro-hydraulic injector for the common-rail injection system should be designed tomeet the precise high fuel delivery control capability. Currently, most high pressure injector in use has a needle driven bythe solenoid coil energy or the piezo actuator controlled by charge-discharge of output pulse current. In this study, macroscopicspray approaching method was applied under constant volume chamber to research the performance of three differentinjectors : solenoid, indirect-acting piezo and direct-acting piezo type for CR direct-injection. LED back illumination for Miescattering was applied on the liquid spray visible of direct-acting piezo injector, including hydraulic-servo type solenoid andpiezo-driven injectors. As main results, we found that a direct-acting piezo injector had better a spray tip penetration thanhydraulic-servo injectors in spray visualization.
직접 니들구동 피에조 인젝터의 3개 설계인자별 분무특성 연구
한상익 ( Han Sangik ),김주환 ( Kim Juhwan ),지형순 ( Ji Hyungsun ),고준채 ( Go Junchae ),김진수 ( Kim Jinsu ),이진욱 ( Jinwook Lee ) 한국액체미립화학회 2016 한국액체미립화학회 학술강연회 논문집 Vol.2016 No.-
The advantages of the common rail fuel injection system have changed the market of diesel vehicle since the development of the diesel engine. This system suggests that a high-pressure pump supply diesel fuel at high pressure up to and above 2000bar to common-rail reservoir. And it makes possible high pressure injection which provides better fuel atomization by solenoid or piezoelectric valves. In this study, the direct needle-driven piezo injector was investigated for achieving injection pressure of 1800bar by optimal design through simplification of inside component and changing number of springs and plates of DPI (Direct needle-driven Piezo Injector). A DPI operation method is shown in Fig. 1 and when the piezo stack is discharged, the displacement of the stack is altered. Then the fuel injection is started through the nozzle hole by moving the needle that was blocking the hole of the nozzle. What start of injection is occurred when a current is discharged is opposed to the general method of the convention piezo injector.
분사압력 1800 bar 실현을 위한 직접 니들구동방식 피에조 인젝터 설계 최적화 연구
한상익 ( Han Sangik ),김주환 ( Kim Juhwan ),지형순 ( Ji Hyungsun ),고준채 ( Go Junchae ),김진수 ( Kim Jinsu ),이진욱 ( Jinwook Lee ) 한국액체미립화학회 2016 한국액체미립화학회지 Vol.21 No.3
The advantages of the common rail fuel injection system architecture have been recognized since the development of the diesel engine. In common rail systems, a high-pressure pump stores a reservoir of fuel at high pressure up to and above 2000 bar. And solenoid or piezoelectric valves make possible fine electronic control over the fuel injection time and quantity, and the higher pressure that the common rail technology makes available provides better fuel atomization. In this study, the direct needle-driven piezo injector was investigated for accomplishing injection pressure of 1800 bar by optimal design by simplification of component and changing number of springs and plates of DPI. It was found that a direct needle-driven piezo injection system features the prototype DPI for passenger vehicle to operate at 1800 bar of injection pressure.