This study is to investigate the effect of material for GPF on the PM reduction characteristics before the improvement of filter efficiency in GPF. The material of GPF was changed to ceramic and metal. The ceramic material was applied to SiC, and the metal materials were employed to STS 310s, STS 316s, and STS 410s. The number of honeycomb and wall thickness were set to 200CPSI, 0.3987mm, respectively. The inlet mass flow was fixed at 0.00695kg/s. The inlet air temperature was changed from 500K(0s∼350s) to 1000K(400s∼900s). It was found that the differences in loading amount according to the GPF materials were difficult to observe because the pore density and porosity were set to be the same to affect only the mechanical properties. STS 310s with the highest temperature value had the fastest regeneration time. However, as time goes on, SiC had the highest regeneration rate characteristics. The reason is that the high-temperature region in the GPF by the high-temperature exhaust gas was rapidly transferred toward the outlet due to the high thermal conductivity of SiC.

The effect of EGR on fuel economy was investigated in a gasoline direct injection engine. The 1-D cycle simulation program of GT-Power was utilized to evaluate fuel consumption rate. At high load, fuel consumption increased by about 2~6% according to EGR rate. Knock mitigation was the main effects, gaining about 80% of the total fuel consumption improvement. At low load, fuel consumption reduction was 0.6~2%, which was much lower than that for high load. The lower improvement of fuel consumption at low load is attributed to solely dilution and chemical effects of exhaust gas.

The effect of gasoline-ethanol blends on performance and NOx emission was investigated in a SI engine with port and direct fuel injection systems. The 1-D cycle simulation program of GT-Power was utilized to analyze the performance of thermodynamic cycle. The results showed that the brake torques are increased with the addition of ethanol to gasoline because of the improvements of volumetric efficiency. The engine with direct ethanol blends injection system has more power than that with port gaoline injection system, which is caused by the higher latent heat of ethanol.

This research aims to develop parts for Advanced Fuel/Oil Filtering Re- circulation applicable to this kind of regulation proof engines. These parts can play a role of converting traditional air emission type crankcase into recovery type crankcase so that the engine can deal with environmental regulations, which do not allow minimal amount of toxic gas discharge. For the experiment, test method and specially made testing equipment are prepared. The results showed that Oil separation efficiency of the Cyclone type crank case oil separator was higher than one of the partition wall type in bench test and that Emission gas of the cyclone type oil separator was higher than one of the partition wall type in vehicle test.

In a bi-fuel engine using gasoline and LPG fuel, with the current ignition timing for gasoline being used, the optimum performance could not be taken in LPG fuel supply mode. The ignition timing in LPG fuel mode must be advanced much more than that of gasoline mode for the compensation of its higher ignition temperature. The purpose of this study is to investigate how the ignition spark timing conversion influences the engine performance of LPG/Gasoline Bi-Fuel engine. In order to investigate the engine performance during combustion, engine performance are sampled by data acquisition system, for example cylinder pressure, pressure rise rate and heat release rate, while change of the rpm(1500, 2000, 2500) and the ignition timing advance(5°, 10°, 15°, 20°). As the result, between 1500rpm, 2000rpm and 2500rpm, the cylinder pressure and pressure rise rate was increased when the spark ignition was advanced but pressure rise rate at 20° was smaller value.

A burning principle in gasoline engine is the one of being burned, by which a mixer in air and gasoline enters a combustion chamber and causes a spark in the proper timing. This is formed, by which ECU controls the fuel-injection volume and the fuel-injection timing, and determines the performance of engine. The purpose of this study is to test the characteristics on knocking in gasoline engine with the knocking-sensor equipment and to research into the characteristics in knocking while directly controling the optimal igniting timing and the fuel-injection timing through engine ECU. Given controlling ECU by grasping the characteristics in knocking, which becomes the most problem in the engine tuning market, the tuning in a true sense will be formed in gasoline engine.

1. Through this experiment, we made certain that the best distinguished frequency area of the Hyundae Beta 2.0 engine's knocking is 6.8khz. 2. Through the experiment, we checked the output power voltage condition of the logging output with the generation of a engine knocking. And wechecked up that it generated maximumly up to 11.4 V which depends on the degree of the streng.

가변 압축비 기관(C. F. R.)에 ionization gap probe를 피스톤 및 실린터 헤드 sleeve에 설치하여 화염거동에 대하여 실험한 결과는 다음과 같다. 1) 혼합연료에서 화염전파속도는 메타놀 함량에 따라 증가한다. 2) 혼합연료에서 메타놀 percent가 증가하면 에너지 소모비 (Btu/HP-hr)가 감소하여 열효율은 증가한다. 3) 당량비가 일정하면 평균유효압력은 메타놀 량이 증가할수록 감소한다. 4) 순수한 가솔린 및 혼합연료는 점화진각이 클수록 NO 하(X) 방출량은 증가하고 희박 혼합기 영역에서 NO 하(X) 방출량은 최대가 된다. 또 RG50/M40/THF10/W1의 연료에서는 당량비가 0.95이하에서는 당양비가 낮을수록, 점화진각이 높을수록 NO 하(X) 방출량은 증가하고, 0.95 이상에서는 당량비와 점화진각이 클수록 방출량은 감소한다. 5) CO, HC의 최소값은 메타놀 함유량이 높을수록 감소한다.