• Journal of ILASS-Korea
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• v.23 no.3
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• pp.128-135
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• 2018

In this study, the following conclusions could be obtained from the analysis of emissions contribution rates and features for contaminated emissions by 13,456 gasoline vehicles passed in the vehicle load test (ASM-idle) under the inspection year 2013 to 2017. It was confirmed that the contamination of the CO, HC, NOx by the displacement is reduced on over 3L engine. As a result of comparing the exhaust gas in the low speed idle mode and the AS2525 mode, the exhaust gas in the low speed idle mode was measured high. It is estimated that if ISG function is applied, emissions from idle condition will be reduced. NOx emissions were reduced when the engine power was above 200HP. It has been confirmed that the amount of exhaust emissions are significantly reduced for vehicles manufactured after 2004. As a result of analyzing the exhaust gas according to the season, it is judged that there is a correlation between HC and NOx according to the ambient temperature. The concentration of exhaust emission in vehicles with high accumulated distance increases, which is considered to be the result of aging of the vehicle.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1358-1359
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• 2008

HC(hydrocarbon)센서는 최근 내연기관의 과도상태의 연소 효율 및 배기가스 저감 효율을 높이기 위하여 산소센서와 함께 연소제어 분야에서 많이 사용되고 있다. 현제 HC센서는 전기화학식 및 current limiting 방식을 많이 사용하고 있으며 이는 HC가스의 이온화를 유도하는 촉매를 매질로 하는 전기화학식 센서이다. 이러한 촉매의 경우 장기 사용 시 촉매의 열화 및 변형 등으로 신뢰도가 떨어지게 된다. 본 논문에서는 촉매를 이용하지 않고 HC 가스의 이온화를 위하여 고전압 하전방식의 hydrocarbon센서를 고안하였으며[1], 여러 배출가스를 통한 센서의 전기화학적 성능을 분석하였고 온도 및 HC성분에 따른 전류치 변화를 이용하여 이론적 계산식을 제안하였다.

• Proceedings of the KSME Conference
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• 2008.11b
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• pp.2910-2915
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• 2008

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 furl 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 mechanical and reduction mechanical 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 start delay time, cylinder pressure, HC/NOx emissions, 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.

• Journal of the KSME
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• v.19 no.2
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• pp.106-112
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• 1979

70년대초만 하여도 디이젤기관의 배출가스에 대해서는 일반적으로 그렇게 문제시 인식되지 않 았다. 다만 우리들 감각으로 흑연이 나오니까 CO가 많겠고, 특유의 주기가 있으니 HC가 많지 않 을까\ulcorner 하는 정도 였었다. 또한 가솔린 기관에 비하여 유해배출가스가 비교적 적기 때문에 그에 대한 연구도 눈에 띄게 진전하지 않았다. 공해의 선진국이라 말할 수 있는 미국. 일본에서도 가솔린기관의 규제보다 5,6년 늦어, 캘리포오니아주에서는 1973년에 제안하여 규제가 시작되었고, 일본에서도 디이젤기관의 본격적 오염도 규제가 1975년부터 시작하였다. 그러나 최근 가솔린 기관의 배출가스 공해문제의 해결대책이 극한에 달해 가고 있고, 도시인구의 대량집중화 및 수 송화물차량의 급증으로 디이젤차량(Bus, Truck 등)의 교통수단이 증대 일로에 있다. 이에 따라 디이젤기관의 배출가스의 대책도 심각하게 되어 연구가 활발하게 이루어져 가고 있다. 따라서 본 소고에서는 디이젤기관의 오염물질배출기구와 배출가스에 영향을 주는 제요소 및 그 대책에 대 하여 개괄적으로 간단히 살펴보기로 한다.

• Journal of Aerospace System Engineering
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• v.14 no.spc
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• pp.7-12
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• 2020

In this paper the new revision of Korean Airworthiness Standards (KAS) - Emissions was proposed for enforced environmental standards. The Aircraft Engine Fuel Venting and Exhaust Emissions Requirements have been only defined for smoke, HC, CO and NOx as management items in previous KAS. However, this standard has not covered the current situation that International Civil Aviation Organization (ICAO) and United States Environmental Protection Agency (EPA) enforced environmental regulations, such as emissions trading system, limitation of CO₂ emissions and restriction of exhaust gas. In order to overcome these outdated situations, we presented the new requirements for aircraft exhaust gas emissions standard of Korea based on the latest standards of United States, Europe and other countries.

• Journal of Korean Society for Atmospheric Environment
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• v.14 no.4
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• pp.313-320
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• 1998

The most desirable diesel oxidation catalyst (DOC) should have the properties of oxidibing CO and HC effectively at low exhaust gas temperature while minimizing the formation of sulfate at high exhaust gas temperature. Precious metals such as platinum and palladium have been known to be sufficiently active for oxidizing CO and HC and also to have high activity for the oxidation of sulfur dioxide (SO2) to sulfor trioxide (SO3). There is a need to develop a highly selective catalyst which can promote the oxidation of CO and HC efficiently, but, on the other hand, suppress the oxidation of SO2. One approach to solve this problem is to load a base metal such as vanadium in Pt-based catalyst to suppress sulfate formation. In this study, a Pt-V catalyst was prepared by impregnating platinum and vanadium onto a Ti-Si wash coated catalyst in a laboratory reactor by changing the formulations and reaction temperatures.

• 한국연소학회:학술대회논문집
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• 1999.10a
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• pp.183-188
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• 1999

For two engine design parameters; compression ratio and intake swirl ratio, measurement of concentrations of hydrocarbon species has been made as a function of various air-fuel ratio in order to investigate the ozone formation of HC emissions from LPG fuel. Higher compression ratio gave lower SR values due to larger aIkan species and higher BSR values because of larger NMHC generation. Swirl ratio did not affect HC emissions and ozone formation. For ${\lambda}=1.1{\sim}1.2$, higher SR values resulted from the species of aIken which has higher MIRs were highly produced. Leaner mixture showed lower SR values due to the increase of the aIkan which has a lower MIR.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.04a
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• pp.174-175
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• 2000

대기오염은 화석연료를 사용한 산업혁명 이후에 본격적으로 나타난 현상이다. 특히, 중공업을 중심으로 하는 고도 성장기에는 대기오염물질의 배출이 급격히 증가하였으며, 인구집중이 심한 도시와 도시근교서의 대기오염은 사회문제로 대두되었다. 최근에는 산성비 및 온난화와 같은 지구규모의 환경문제로 발전되고 있다. 그 중에서 질소산화물(NOx)과 탄화수소(HC)에 의한 도시 대기오염은 점점 증가하는 추세이며, 특히, 광화학 옥시던트(Ox)는 발생 메카니즘이 복잡하며, 발생원과 오염지역과의 상호 연관성 파악이 어렵기 때문에 지금까지 대부분 환경평가 대상에서 제외되었으나, 향후의 환경 정책문제로 수용되고 있는 추세이다. (중략)

• Journal of the korean Society of Automotive Engineers
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• v.13 no.5
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• pp.89-94
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• 1991

In the quantitative analysis of oxygenated exhaust emissions (unburned methanol, formal- dehyde) from methanol fueled vehicles, the oxygen contained in oxygenated exhaust gases lowers the FID (Flame Ionization Detector) response factor of conventional THC analyzer and leads to erroneous HC reading. For correct measurement of various HCs including oxygenated HCs emitted from FFV(Flexible Fuel Vehicle), first of all, the measurement technique of real HC emissions should be established. GC and HPLC-DNPH measuring methods specified by the EPA are used in this paper to analyze unburned methanol and formaldehyde components in the exhaust emissions. In emission test of FFV, unburned methanol and formaldehyde are emitted mostly during cold transient period, and it is shown that formaldehyde emission level is proportional to engine displacements. In view of the HC emission level, vehicle using M85 has 40% advantage over gasoline-fueled vehicle in OMHCE and has a good potential of a low emission vehicle.

• Journal of Korean Society of Transportation
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• v.34 no.2
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• pp.180-190
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• 2016

Atmospheric pollutants such as Nitrogen Oxides(NOx), Carbon Monoxide(CO), Carbon Dioxide($CO_2$), Particulate Matter(PM) and Hydrocarbons(HC) come from vehicle exhaust gases. Emission curves based on average travel speeds have been employed for estimating on-road emissions as well as evaluating environmental impacts of transportation plans and policies in Korea. Recently, there is a growing interest in estimation methods of vehicle emissions considering relationship between vehicle dynamic driving characteristics and emissions, and incorporating such emission estimators into traffic simulation models. MOVES Lite, a simplified version of MOVES, is one of the estimation methods. In this study, the authors performed a study to develop an adaptable version of MOVES Lite for Korea, called MOVES Lite-K. Vehicle types, driving characteristics, emission rates, and emission standards of Korea were reflected in MOVES Lite-K. The characteristics of emission calculation of MOVES Lite-K and NIER emission curves were compared and the adaptability of MOVES Lite-K were examined.