• 한국분무공학회지
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• 제17권3호
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• pp.152-157
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• 2012

This investigation decribes the effect of the combustion and emission characteristics of HCNG engine according to the high purity hydrogen contents. The HCNG fuel was made by the mixture with a high purity hydrogen ($H_2$) and a natural gas. The test vehicle was applied to the bi-fuel (Gasoline and CNG) system and this system was modified from the fuel supply and fuel tank. In addition, the three premixed HCNG fuels with mixed rate of 10, 20 and 30% of hydrogen were used to maintain the safety. In order to analyze the combustion characteristics of HCNG and CNG, the fuel was injected in the combustor with constant volume. The exhaust emission from light duty vehicle with bi-fuel system was analyzed by a chassis dynamometer and emission analyzer. From these results, the reduction rate of NOx emission increased in the HCNG fuel and emission amount of THC and CO shows a similar level with CNG fuel. This study can be utilized the basic data for the development of a new business plans related with HCNG engines.

• 한국분무공학회지
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• 제21권3호
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• pp.137-143
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• 2016

The LPG vehicles are being operated by commercial purposes generally such as taxis. Most of taxis have a long-mileage and a harsh driving pattern. These properties may accelerate aging of the three-way catalysts much faster than the passenger vehicles. Because of this background, it was analyzed the test result of fuel efficiency and emissions on the LPG-fueled light duty vehicle. It was selected for a LPG vehicle of ULEV level to measure the fuel efficiency and emissions of the aged three-way catalysts. And the aged three-way catalysts which was driven about 300,000km and 550,000km replaced on the test vehicle in consecutive order. As a result, The aged three-way catalysts generally had no effect on fuel efficiency result, and harmful exhaust emissions had been shown to increase in most of the test mode, even though it satisfied the regulation value on most test modes.

• 한국수소및신에너지학회논문집
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• 제29권5호
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• pp.497-502
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• 2018

In Korea, passenger car and van using LPG fuel including taxi constantly increased due to the high cost of fuel. Recently, the emission standard has continuously tightened in the world. In this investigation was conducted the greenhouse gas emission characteristics of LPG vehicles according to the displacement and weight. Exhaust emission characteristics of 13 test LPG vehicles from about 1.0 L to 3.0 L displacements were measured and analyzed by using chassis dynamometer and emission analyzer. It is revealed that the greenhouse gas emission was showed the increasing tendency as the displacement and curb weight increased. Also, greenhouse gas emission of SC03 driving cycle has highest value and that of HWFET driving cycle shows the lowest value.

• 한국안전학회지
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• 제24권4호
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• pp.1-10
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• 2009

The characteristics of smoke emissions from diesel heavy duty vehicles which weigh over 5.5 tons was investigated by driving the vehicles with both the Lugdown 3 modes in the chassis dynamometer and tree accelerating mode under no load. The vehicles include commercial vehicles such as bus, microbus, trucks and specialized vehicles, etc. The total numbers of the vehicles tested were 200. The light extinction method was used to measure the smoke emissions from the vehicles tail pipe. The values of the smoke emissions in the tree accelerating mode showed $0{\sim}20%$ band nearly independent of both the mileage and year of production of the tested vehicles, while those in the Lugdown 3 modes showed $0{\sim}99%$ of wide band. The correlation coefficients between the values of the smoke emissions with both the Lugdown 3 modes and the free acceleration mode were 0.12, 0.08, 0.12, respectively. The inspection with Lugdown 3 modes is better one than that with tree acceleration from the point of exact inspection of the diesel vehicles' smoke emission.

• 융복합기술연구소 논문집
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• 제8권1호
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• pp.5-8
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• 2018

Emissions of diesel vehicles have been regulated by NEDC mode for a long time. However, the NEDC mode has been known the control of emission reduction is not reflected properly on actual road conditions. For these reasons, diesel vehicle emissions are regulated in both NEDC mode and WLTC mode from 2017 to 2020, from 2020 onwards, the emissions of diesel vehicles will measure in WLTC mode only and will not be able to exceed 1.5 times the regulated value. The purpose of this study is to analyze the development trend of diesel vehicle after-treatment system in order to comply with the future regulations on diesel vehicle. As a result, it is essential to reduce the NOx emissions of diesel vehicles for Euro 6, the NOx emissions of the test vehicle equipped with SCR were 30% to 50% loss than the test vehicle equipped with LNT despite the higher curb weight and engine displacement.

• 대한기계학회논문집B
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• 제36권5호
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• pp.503-508
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• 2012

최근에 들어서 이산화탄소가 지구온난화의 원인으로 알려져 있기 때문에 온실가스 문제는 이슈화 되어 왔다. 본 연구는 한국에서 운행 중인 차량에서 이산화탄소 배출가스 영향인자 특성을 파악하고자 했다. 가솔린 자동차 129대, 디젤자동차 100대, LPG 자동차 34대 차량을 차대 동력계에서 시험했다. 시험과정에서 이산화탄소, 일산화탄소 그리고 연료저감율을 측정했다. 실험모드는 현재 한국에서 경차의 배출가스를 규제하기 위해서 배출계수를 산정하기 위해 개발된 CVS-75 모드에서 이루어졌다. 실험 결과 배기량, 연료소비율, 연료 종류, 주행패턴, 마일수 그리고 이산화탄소 사이의 관련성이 조사되었다.

• 대한기계학회논문집B
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• 제40권8호
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• pp.485-494
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• 2016

본 연구는 TMED 방식 병렬형 하이브리드 차량을 이용하여 회생제동 회수율 및 연비 특성 실험에 대한 것이다. 회생제동 기술은 하이브리드 차량의 에너지 효율 향상을 위해 필수적인 기술로 판단되어 연구를 수행하였다. 따라서 병렬형 하이브리드 차량과 Eddy Current 방식의 차대동력계를 통해 IM240 모드 실험 시 초기 SOC 상태, 주행 모드 특성, 운전자의 운전특성에 따른 연비 특성을 회생 제동 측면에서 전류 특성 및 전류수지에 대한 비교 분석을 수행하였다. 본 연구결과, 초기 SOC 상태가 낮을수록 하이브리드 차량의 엔진 작동 시간이 증가 하고 에너지 효율이 낮아지는 것을 알 수 있었다. 또한 주행 모드 특성, 운전자의 운전 특성에 따른 연비 특성 실험 결과 평균 연비 차이는 크게 나지 않았지만, 최종 SOC 상태에 따라서 모드 종료 후 엔진 작동 유무의 차이가 있음을 알 수 있었다.

• 대한기계학회논문집B
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• 제31권2호
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• pp.188-194
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• 2007

New diesel engines equipped with common-rail injection systems and advanced engine management control allow drastic decreases in the production of particulate matters and nitrogen oxides with a significant advantage in terms of the fuel consumption and $CO_2$ emissions. Nevertheless, the contribution of exhaust gas after treatment in the ultra low emission vehicles conception has become unavoidable today. Recently the passive type DPF(Diesel Particulate Filter Trap) system for diesel passenger vehicle has been manufactured into mass production from a French automotive maker since the year of 2000. This passive DPF system fully relies on the catalytic effects from additives blended into the diesel fuel and additives injected into the DPF system. In this study, the effects of PM regeneration in the commercial diesel passenger vehicle with the passive type DPF system were investigated in chassis dynamometer CVS(constant volume sampler)-75 mode. As shown in this experimental results, the DPF regeneration was observed at temperature as low as $350^{\circ}C$. And the engine-controlled the DPF regeneration founded to be one of the most promising regeneration technologies. Moreover, the durability of this DPF system was evaluated with a season weather in terms of the differential pressure and exhaust gas temperature traces from a road test during the total mileage of 80,000km.

• 대한기계학회논문집B
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• 제41권11호
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• pp.775-784
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• 2017

본 연구의 목적은 운행자동차에 있어서 안전운행과 환경에 문제가 없는 효과적인 엔진튜닝의 작업가능성을 확인하고, 튜닝엔진의 특징을 파악하여 엔진튜닝 검사의 기초자료를 분석하는 것이다. 비튜닝 및 튜닝 엔진 2-1, 2-2, 2-3의 4종류에 대한 넓은 범위의 엔진회전수 하에서 4행정, 4기통 DOHC, 터보 인터쿨러, 수냉 가솔린엔진의 실제 운행자동차를 사용하여 공연비 및 성능 특성에 미치는 튜닝엔진의 효과를 실험적으로 조사했다. 운행 가솔린자동차에 대한 엔진의 튜닝 부분은 흡기 다기관, 흡기 파이프, 공기필터, 배기 다기관, 배기 파이프 및 소음기를 포함한다. 1인이 탑승한 5단 자동변속기를 갖는 운행 가솔린자동차 비튜닝 및 튜닝 엔진의 공연비 및 토크는 차대 동력계(Dynojet 224xLC)에 의하여 실험에 의해 측정하였다. 운행 가솔린자동차 튜닝엔진의 최대 토크는 비튜닝엔진보다 평균 103.68% 만큼 증가되었고, 튜닝엔진의 최대 출력은 비튜닝엔진보다도 평균 119.68% 만큼 증가되었음을 알았다.

• 대한기계학회논문집B
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• 제36권4호
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• pp.371-376
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• 2012

본 연구에서는 대형버스 배기가스 테스트 모드인 JE-05 에서 DME와 디젤을 연료로 사용하는 대형 DME버스를 차대동력계, 배기가스 분석기 그리고 PM 측정시스템을 이용하여 대형 DME버스의 연비, 배기가 스특성 그리고 동적 특성에 대해 알아보았다. 대형 DME버스에는 6기통 8,071cc 디젤엔진이 장착되었으며, 현재 운행되고 있는 상용 디젤버스와는 달리 DOC, DPF와 같은 후처리 장치가 없다. 실험 결과, 각 부하에 따른 차량의 속도를 통하여 차량의 동적 특성은 DME와 디젤을 사용했을 때 거의 비슷한 것을 알 수 있었다. NOx, CO와 THC는 DME를 연료로 사용 시 디젤연료에 비해 더 적게 배출되는 것을 확인하였다. 하지만 PM은 DME연료를 사용 시 거의 발생하지 않았는데, 이는 DME가 함산소연료이고 분자구조상 탄소-탄소 결합이 없기 때문이라고 생각된다. $CO_2$는 각 연료 사용 시 비슷하게 발생하였으며, 저위발열량 베이스로 계산된 연비는 DME연료 사용 시 디젤연료보다 약 6.7% 더 낮게 나왔다.