직분식 엔진에서 연료공급 조건에 따른 CNG와 공기의혼합 및 연소특성

• Published in: 한국액체미립화 학회지, 13(1) pp. 1 - 8
• Main Authors: 강정호, 박종상, 염정국, 정성식, 하종률
• Format: Journal Article
• Language: Korean
• Published: 한국액체미립화학회 01.03.2008
• Subjects: 기계공학
• ISSN: 1226-2277

It was investigated how fuel injection timing - early injection and later injection in conjunction with throttle open rate effect the fuel-air mixing characteristics, Engine power, combustion stability and emission characteristics on a DI CNG spark Engine and control system that had been modified and designed according to the author’s original idea. It was verified that the combustion characteristics were changed according to fuel injection timings and Engine conditions determined by different throttle open rates and rpm. It was found that the combustion characteristics greatly improved at the complete open throttle rate with an early injection timing and at the part throttle rate with a late injection timing. Combustion duration was governed by flame propagation duration in a late injection timing and by an early flame development duration in an early injection timing. As the result, we discovered that combustion duration is shortened, lean limit is improved, air-fuel mixing conditions controlled, and emissions reduced through control of fuel injection timing according to change of the throttle open rate. KCI Citation Count: 0