Study of the effects of injector cleaning on the exhaust gases in a common rail diesel engine

커먼레일 디젤엔진의 인젝터 클리닝이 배기가스에 미치는 영향에 관한 연구

  • Cho, Hong-Hyun (Department of Mechanical engineering, Chosun University) ;
  • Kim, Tae-Jung (Graduate school of Mechanical engineering, Chosun University)
  • 조홍현 (조선대학교 기계공학과) ;
  • 김태중 (조선대학교 기계공학과 대학원)
  • Received : 2014.09.26
  • Accepted : 2014.10.10
  • Published : 2014.10.31


As a response to exhaust gas regulations, the electronic control system was applied to the diesel engine. The injected fuel mass and injection timing are accurately controlled using it, and the fuel efficiency and the engine output are significantly increased. In addition, the noise and the vibration of vehicles are decreased. To maintain the optimal performance of an electronic control diesel engine, it is important to control the fuel injection pressure accurately using the fuel pressure regulator. When the fuel pressure regulator is not worked normally, the failure phenomena (starting failure, staring delay, accelerated failure, engine mismatch et al.) occurred because the fuel pressure is not stabilized and controlled accurately. In this study, the effects on a fuel pressure, return fuel mass flow, and engine rotating speed according to the control rate of fuel pressure regulator were investigated to analyze the performance variation under the failure conditions of a fuel pressure regulator. As a result, when the control rate of a fuel pressure regulator decreased by 4%~6% compared to that of the standard condition, the variation of engine rotating speed and return fuel flow were increased greatly, and the abnormal condition occurred. In addition, it is possible to diagnose the failure of a fuel pressure regulator by monitoring these conditions.


Common rail diesel engine;Injector;Exhaust gas;Cleaning;Injector cleaning


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