연료 레일 체적이 가스분사 특성에 미치는 영향(2) - 레일 내부 압력 변동 특성

김형구; 현지혜; 엄인용

doi:10.9726/kspse.2019.23.4.031

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저널정보

한국동력기계공학회
동력시스템공학회지 학술저널
한국동력기계공학회지 제23권 제4호
2019.8 31 - 38 (8page)
DOI : 10.9726/kspse.2019.23.4.031

저자정보

김형구 (SK 네트웍스)
현지혜 (서울과학기술대학교)
엄인용 (서울과학기술대학교)

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이 논문의 연구 히스토리 (2)

2019

연료 레일 체적이 가스분사 특성에 미치는 영향(2) - 레일 내부 압력 변동 특성

김형구 , 현지혜 , 엄인용 동력시스템공학회지 2019.08 학술저널

2016

내연기관 가스분사 시스템에서 레일 체적 및 압력, 운전속도가 연료 분사 특성에 미치는 영향

김형구 나노·IT융합프로그램 2016 학위논문

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초록·키워드

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This study is to investigate the characteristics of fuel rail pressure fluctuation according to fuel injection pressure, injection pulse width and engine speed in a gas fuel injection system. The fuel rails with the volume of 5, 100, 200, and 435 cc were used. Compressed air was used as an analogous fuel, and injection was controlled using an injector driver. A pressure sensor, a piezo-resistive amplifier, and an oscilloscope were used. The pressure waveform was averaged by measuring 100 times. The injection pressures were set at 1.5, 3.0, 4.5 and 6.0 bar, and the engine speeds were set at 750, 1000, 1500, 2000, 3000, 4000, 5000 and 6000 rpm and injection periods were 3, 5, 8 and 13 ms. As the engine speed increased and the injection pulse width became longer, the pressure inside the fuel rail decreased drastically and the pulsation phenomenon gradually disappeared. Increased engine speed and injection period started to connect almost continuously in the period of operation of the injector and overlapped each other finally. It was believed that the fuel rail was not supplied with additional fuel enough to recover the pressure due to an increase in injection flow rate than the increase in supply volume of the pressure regulator. Regardless of the volume change, the tendency of the in-rail pressure drop was very constant, but the pressure fluctuation decreased as the volume of the fuel rail increases, contributing to securing the fuel injection stability to some extent. Since the reduction in rail pressure did not ensure the required injection flow rate under full load conditions. Therefore, it is necessary to devise a method for maintaining the pressure inside the rail.

#Gas injection #Rail volume #Injection pressure #Injection pulse width #Engine speed