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진종무(Jongmoo Jin),김민철(Mincheol Kim),박종상(Jongsang Park),하종률(Jongyul Ha),정성식(Sungsik Chung),염정국(Jeongkuk Yeom) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The objective of this study is to derive the optimum performance of CNG fueled operation in a commercial two-cylinder engine that was adapted for the engine using PFI(Port Fuel Injection) together with sub-chamber DI(Direct Injection). In case of using dual injection type, the optimized injection quantity to improve the engine efficiency is determined by comparing and investigating each injection type, Combustion characteristics in accordance with air excess ratio and injection timing were investigated by multi-point injection using CNG fuel. On the basis of PFI type, the standard of fuel injection duration was obtained and it was applied to DI type. Air excess ratio was regulated by handel accelerator and Lambda sensor, and Spark timing and injection timing were controlled by the custom-built ECU. Furthermore, the data about in-cylinder pressure, rate of heat release, IME(Indicated Mean Effective pressure), mass fraction burned and COV<SUB>imep</SUB>(Coefficient Of Variation) were gotten by Lab-VIEW.
RI 방식 CNG 엔진의 분사시기가 연소특성에 미치는 영향
박종상(Jongsang Park),진종무(Jongmoo Jin),하동흔(Dongheun Ha),염정국(Jungkuk Yeum),이중순(Joongsoon Lee),정성식(Sungsik Chung) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The prior study for RI(radical ignition) method was carried out in the experimental ways using a CVC(constant volume combustor) and applying the basic results from the CVC to a real engine. The rapid combustion and the expansion of the combustible lean limit of RI method were realized by the 0.45% sub-chamber volume of the overall combustion chamber in the CVC. But the gasoline fueled RI engine showed the severe problem of high cycle variation due to the difficulty of the residual gas scavenge in the sub-chamber from the former cycle. To solve this problem, CNG fuel was directly supplied into the sub-chamber instead of the port fuel injection. A DI Diesel Engine with the same specifications used in a previous study was modified to a RI-CNG Engine, and injection pressure was constantly kept at 6㎫ by a regulator. This study was performed to investigate the effects of injection timings on the combustion and performances of the RI-CNG Engine. The excess air ratio was varied from 1.0 to the lean limit at the condition of 50% throttle open rate and 1700rpm. The combustion characteristics of the RI-CNG engine such as in-cylinder pressure, indicated thermal efficiency, cycle-by-cycle variation, combustion duration and emissions were investigated.