Development and performance analysis of a Miller cycle in a modified using diesel engine

  • Choi, Gyeung-Ho (EROOM G & G Co., Ltd) ;
  • Poompipatpong, Chedthawut (Science in Automotive Engineering, King Mongkut's Institute of Technology North Bangkok) ;
  • Koetniyom, Saiprasit (Science in Automotive Engineering, King Mongkut's Institute of Technology North Bangkok) ;
  • Chung, Yon-Jong (Department of Automotive Engineering, Daegu Mirae College) ;
  • Chang, Yong-Hoon (Department of Mechanical & Automotive Engineering, Induk Institute of Technology) ;
  • Han, Sung-Bin (Department of Mechanical & Automotive Engineering, Induk Institute of Technology)
  • 발행 : 2008.12.31

초록

The objective of the research was to study the effects of Miller cycle in a modified using diesel engine. The engine was dedicated to natural gas usage by modifying pistons, fuel system and ignition systems. The engine was installed on a dynamometer and attached with various sensors and controllers. Intake valve timing, engine speed, load, injection timing and ignition timing are main parameters. The results of engine performances and emissions are present in form of graphs. Miller Cycle without supercharging can increase brake thermal efficiency and reduce brake specific fuel consumption. The injection timing must be synchronous with valve timing, speed and load to control the performances, emissions and knock margin. Throughout these tested speeds, original camshaft is recommended to obtain high volumetric efficiency. Retard ignition timing can reduce $NO_x$ emissions while maintaining high efficiency.

키워드

참고문헌

  1. Akira, T., et al., "Mitsubishi Lean-Burn Gas Engine with World's Highest Thermal Efficiency." Mitsubishi Heavy Industry, Ltd. Technical Review." Vol. 40 No.4 (Aug. 2003). 1-6.
  2. http://en.wikipedia.org/wiki/Miller_cycle
  3. http://www.gizmohighway.com/autos/miller_engine.htm
  4. Takagaki, S. "The effects of compression ratio on nitric oxide and hydrocarbon emissions from a spark-ignition natural gas fuelled engine." SAE paper 970506, (Feb. 1997).
  5. Koichi, H., et al., "A study of the improvement effect of Miller-cycle on mean effective pressure limit for highpressure supercharged gasoline engines." JSAE. 18 (1997). 101-106. https://doi.org/10.1016/S0389-4304(96)00069-0
  6. Caton, J. A. "Effects of the compression ratio on nitric oxide emissions for a spark ignition engine : results from a thermodynamic cycle simulation." Int. J. Engine Res.. Vol. 4 No. 4 (2003). 249-268. https://doi.org/10.1243/146808703322743877
  7. Tsukida, S., et al., "Production Miller-Cycle Natural Gas Engine." Inter- Tech Energy Progress, Inc.. (1999). 1-9.
  8. Sarki, A. A., et al., "Efficiency of a Miller Engine." Applied Energy. (2005). 1-9.
  9. Lee, J. H. A Study of the Thermal Efficiency on the Industrial Engine with Miller Cycle. Master Thesis, Department of Automotive Engineering, Graduate School, Keimyung University, 2006.