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과급 GDI 차량의 Mode 주행 시 극미세입자 배출 특성에 관한 연구
최관희(Kwanhee Choi),고아현(Ahyun Ko),황인구(In Goo Hwang),명차리(Cha-Lee Myung),권상일(Sangil Kwon),박심수(Simsoo Park) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
GDI engines have widely adopting recently for advantages in engine performance and fuel economy compared with conventional MPI gasoline engines, but disadvantages in particulate matter, not only its mass but also its number, have becoming a problem. This paper investigated about nano-particle characteristics exhausted from a turbo-charged gasoline direct injection vehicle during regulated vehicle driving cycle. As a result, particulate matters mainly exhausted during cold condition and rapid acceleration. The total particle number concentration of the GDI vehicle on NEDC mode was measured as 6.03E+11 N/㎞, which cannot satisfy the expecting particle number regulation, 6.0E+11 N/㎞, scheduled to start in Euro-6 emission regulation. Size distribution of particulate matters assessed by the fast response PM analyzer showed that accumulation mode particles near 60㎚ mainly exhausted, nuclei mode particles under 30nm appeared simultaneously. Therefore, efforts to reduce the particle number emission of the GDI engine should be achieved by reforming the engine body as well as improving the EMS logic.
SI 엔진의 시동 및 아이들 구간에서의 점화시기에 따른 싸이클별 연소현상에 관한 실험적 연구
최성원(Seongwon Choi),최관희(Kwanhee Choi),명차리(Cha-Lee Myung),박심수(Simsoo Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
THC(Total Hydrocarbon) emissions during cold start and warm-up phase constitute the majority of THC emissions during the FTP-75 mode. As the basic approach to improve the emission performance of Gasoline engine during transient phase, the effect of spark timing retard from MBT on THC emission characteristics is studied by engine test using a Fast response Flame Ionization Detector(FFID). A cyclic analysis of the combustion process shows that high THC emissions are produced first few cycles during the transient phase. This paper presents the results of engine performance and emission of Gasoline engine with various spark timing consequently, This paper was focused on the combustion phenomena with various spark timing during transient phase which was analyzed by Fast response Flame Ionization Detector(FFID) equipment to measure the cyclic THC emission characteristics.
GDI 차량의 Mode 주행 시 GPF 가 극미세입자 배출 특성에 미치는 영향에 관한 연구
김주원(Juwon Kim),최관희(Kwanhee Choi),고아현(Ahyun Ko),명차리(Cha-Lee Myung),박심수(Simsoo Park),이정민(Jeongmin Lee),이민호(Minho Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
GDI engines have widely adopting recently for advantages in engine performance and fuel economy compared with conventional MPI gasoline engines, but disadvantages in particulate matter, not only its mass but also its number, have becoming a problem. This paper investigated about nano-particle characteristics exhausted from a gasoline direct injection vehicle installed the GPF aftertreatment device during regulated vehicle driving cycle. Particle number concentration behaviors were analyzed by a CAMBUSTION DMS500 and TSI CPC instrument. As a result, the total particle number concentration of the GDI vehicle was measured as 4.46E+11 N/㎞ (CVS-75 mode), 4.75E+10 N/㎞. When the GPF was applied, the particle emissions around 40% were captured in the aftertreatment device. Therefore GDI vehicle installed the GPF can satisfy the expecting particle number regulation scheduled to start in Euro-6 emission regulation.
포트 마스킹과 흡기 밸브 타이밍이 실린더 내부의 싸이클별 HC와 NOx 생성에 미치는 영향
전우주(Wooju Jeon),최관희(Kwanhee Choi),명차리(Cha-Lee Myung),박심수(Simsoo Park),이경환(Kyung-Hwan Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This paper investigated the behaviors of combustion characteristics at part load condition with various intake charge motions induced by the port masking schemes in the CVVT (Continuously Variable valve Timing) engine. Time resolved in-cylinder and exhaust emissions were measured by the fast response HC and NOx analyzers to examine their formation mechanisms and behavior characteristics. As a result, in-cylinder HC decreased with the advanced intake valve timings but HC at the exhaust port increased due to the worse combustion stabilities. However HC reduction could be achieved by the application of the port maskings with a enhancement of the engine stability. NOx also decreased with early intake timings by internal EGR but increased with the charge motion controls which enhance the combustion behavior.
GDI 엔진의 연료 분사 제어 로직에 따른 나노입자 배출 특성에 관한 연구
이효근(Hyokeun Lee),최관희(Kwanhee Choi),명차리(Cha-Lee Myung),박심수(Simsoo Park),박종일(Jongil Park),한승국(Seung Kook Han) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Nano-particle characteristics were investigated in the gasoline direct injection engine, for various air fuel ratios, fuel pressures and fuel injection timings in the part load condition. PN concentration and size distribution were measured by the DMS-500 equipped upstream of catalyst. Nano particle emission was closely related with fuel injection timing and in-cylinder flow motion in GDI engine. As a result, PN was decreased with increasing air fuel ratio and fuel pressure. And fuel injection timing was retarded over the middle intake stroke, particle emission was increased but reduced PN during the early intake stroke. In conclusion, optimization of the ECU control strategy on the fuel injection pressure, injection timing as well as air fuel ratio was needed to improve the nano particle emissions in GDI engine.
대형디젤엔진의 NOx 저감을 위한 Urea DCU 시스템의 노즐분무 및 제어특성 평가에 관한 실험적 연구
홍길화(Kilhwa Hong),최관희(Kwanhee Choi),이형민(Hyungmin Lee),박심수(Simsoo Park),이찬(Chan Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, as the current and future emission regulations go stringent, the research of NOx reduction has become the subject of increasing interest and attention in diesel engine. Selective Catalytic Reduction(SCR) technology is well-known to be effective for the reduction of NOx emission. The use of SCR is becoming increasingly more popular as a cost effective way of reducing emissions from heavy duty vehicles. This paper discusses the visualization of Urea injection using two type nozzle for dosing a exhaust pipe with the urea solution and characterization of the DCU(dosing control unit) in Urea SCR system. We designed the two-fluid nozzle that has the duplex port to supply an air. Urea injection angle of nozzle is 18°~23° and water injection angle 16°~18°. We have tested DCU that a novel urea injection system is presented, which is based on a mass produced digital dosing pump that is combined with an electronic control unit specially developed for controlling the Urea-SCR process onboard vehicles.
고급차(제네시스), 고성능차(N) 상품성 확보를 위한 엔진 감성 성능 개발
박종일(Jongil Park),최관희(Kwanhee Choi),임현준(Hyunjun Lim),박종국(Jonguk Park),이춘식(Chunsik Lee),김영권(Youngkwon Kim),김명훈(Myunghoon Kim) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
Since Hyundai Motor company developed first new alpha engine, HMC has focused to get higher engine performance and better fuel economy. Recently HMC is preparing to enter new high performance , luxury market. To achieve success in that market, powertrain developments are also required to have different approaches. In this study, to satisfy our new customer’s need, two major engine control logic has been developed and applied. One is making after-burn sound and the other is developing launch control with turbocharger pre-charging. The result of two development were impressive in term of customer emotional satisfaction and will be applied to mass production vehicle.
LPG성상에 따른 세미리턴방식 LPi엔진의 시동성 및 싸이클 별 HC/NOx 배출 특성
김주원(Ju-Won Kim),최관희(Kwanhee Choi),명차리(Cha-Lee Myung),박심수(Simsoo Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This paper was investigated the behaviors of the engine and combustion phenomena for various LPG compositions in the semi-return type system, which is not recircurated to LPG tank through fuel rail, applied LPi engine during a cold idle condition and including a cold start of the engine. Cyclic HC and NOx emissions were measured at exhaust port to examine their formation mechanisms and reduction mechanisms with fast response gas analyzers. Various ignition timing is experimented to study the characteristics of combustion phenomena, HC/NOx emissions during fast idle. Also, this study was investigated strat delay time, cylinder pressure, HC/NOx emission, Mass Fraction Burned, starting time to evaluate performance of transient cold startability. Compared to the return type system, the semi-return type system have advantages in point of production cost and equivalent performance of engine starting time and pressure settling time.