• 한국자동차공학회논문집
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• 제16권5호
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• pp.106-112
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• 2008

Modern vehicles require a high degree of refinement, including good drive ability to meet customer demands. Vehicle drive ability, which becomes a key decisive factor for marketability, is affected by many parameters such as engine control and the dynamic characteristics in drive lines. This paper focuses on the simulation of FTP-75 mode which is considered with spark timing control on transient condition. The acceleration is the most important factor for vehicle fuel economy. The retard of spark timing increases in proportion to acceleration. Likewise, bsfc(break specific fuel consumption) which is affected by spark timing also increases in proportion to acceleration. The result of simulation considered transient condition shows 0.3% of error comparing with a test on chassis-dynamometer.

• 한국자동차공학회논문집
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• 제16권2호
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• pp.175-182
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• 2008

In this study, a spark ignition engine operated with LPG and DME blended fuel was studied experimentally. Performance and emissions characteristics of a LPG engine fuelled by LPG and DME blended fuel were examined. Results showed that stable engine operation was possible for a wide range of engine loads within 20% mass content of DME fuel. Also, engine output power within 10% mass content of DME fuel was comparable to pure LPG fuel operation. Exhaust emissions measurements showed that hydrocarbon and NOx were increased with the blended fuel at low engine speed. Engine output power was decreased and break specific fuel consumption (BSFC) was severely increased with the blended fuel since the energy content of DME was much lower than that of LPG. Considering the results of engine output power and exhaust emissions, the blended fuel within 20% mass content of DME could be used as an alternative fuel for LPG.

• 한국자동차공학회논문집
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• 제17권1호
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• pp.35-42
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• 2009

In this study, a spark ignition engine operated with LPG and DME blended fuel was studied experimentally. The effect of n-butane and propane on performance and emissions of a SI engine fuelled by LPG/DME blended fuel were examined. Stable engine operation was achieved for a wide range of engine loads with propane containing LPG/DME blended fuel compare to butane containing LPG/DME blended fuel since octane number of propane was much higher than that of butane. Also, engine output operated with propane containing blended fuel was comparable to pure LPG fuel operation. Engine output power was decreased and break specific fuel consumption (BSFC) was increased with the blended fuel since the energy content of DME was much lower than that of LPG. Considering the results of engine output power, bsfc, and exhaust emissions, the propane containing LPG/DME blended fuel could be used as an alternative fuel for LPG.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2004년도 유체기계 연구개발 발표회 논문집
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• pp.680-686
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• 2004

Recently, the application of variable geometry turbocharger (VGT) to the high speed direct injection (HSDI) diesel engine has gained more and more interest in automotive industry. A steady state experimental investigation has been undertaken on a 1.5L HSDI diesel engine to verify the benefits of VGT comparing to the standard engine having a waste gate turbocharger (WGT). Specifically, part load performances (e.g., fuel economy and emission) have been investigated under various vane angles of the VGT. The results show that the real exhaust gas recirculation (EGR) rate as well as the pumping loss is very important to improve break specific fuel consumption (BSFC). It was previously known that the pumping loss only is a main parameter. In addition, the trade-off relationship between BSFC and NOx according to boost pressure, and the decreasing tendency of NOx with increasing real EGR rate have been verified. 1-D numerical analysis also has been performed, and the numerical results are in good agreement with experimental results.

• 한국가스학회지
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• 제12권3호
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• pp.7-12
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• 2008

본 연구에서는 DME가 함유된 LPG 연료를 불꽃 점화 기관에서 적용 가능 여부를 실험적으로 살펴보고 있다. LPG와 DME가 함유된 혼합연료로 엔진 구동시 엔진출력, 배출가스 특성, 연소안정성 등의 항목에 대한 실험을 $1200{\sim}5200\;rpm$에서 수행하였다. 결과를 살펴보면 20% 내외의 범위에서 DME를 혼합하는 경우 안정된 연소성능을 얻을 수 있었으며 10%까지는 엔진 출력 저하가 거의 없다. 하지만 혼합율이 증가할수록 DME 연료는 LPG보다 에너지 밀도가 낮으므로 출력이 감소하고 제동연료소비율은 증가하는 현상을 보인다. LPG/DME 혼합연료는 향후 DME 시장을 넓혀 나가는 최선의 방법이 될 것이다.

• 에너지공학
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• 제19권1호
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• pp.25-31
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• 2010

본 연구는 엔진을 개조하지 않고 메탄올 개질연료를 사용하여 엔진의 성능과 배출가스 측면에서 가솔린 연료 사용시의 특성과 비교하였다. RM50(메탄올 개질연료)은 메탄올 연료의 특성중 하나인 넓은 가연한계범위를 가지고 있기 때문에 불안정한 운전조건에서도 가솔린 연료에 비해 상대적으로 안정된 운전상태를 유지하고 엔진의 안정적 운전상태를 결정하는데 사용되는 사이클 변동계수에 있어서도 10%이내의 안정된 수치를 보여주었다. 또한, 모든 운전조건에서도 RM50은 가솔린 연료를 사용하였을 때 보다 CO, HC, NOx의 배출물이 감소되었다. 그러나 소음특성의 경우 연소속도가 빠르기 때문에 가솔린 연료에 비해 상대적으로 약간 높은 값을 나타내었고 고무침지의 실험결과는 가솔린 연료 사용시의 실험결과와 유사하게 나타내며 사용 가능한 것으로 나타났다.