Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Analysis on Combustion Characteristics of CRDi Single-cylinder Diesel Engine with Direct Needle-driven Piezo Injector

직접구동 피에조 인젝터의 CRDi 단기통 디젤엔진 연소 특성 분석

  • Chung, Myungchul (Department of Mechanical Engineering, Graduate School, Soongsil University) ;
  • Sung, Gisu (Department of Mechanical Engineering, Graduate School, Soongsil University) ;
  • Kim, Sangmyung (Department of Mechanical Engineering, Graduate School, Soongsil University) ;
  • Lee, Jinwook (Department of Mechanical Engineering, Soongsil University)
  • 정명철 (숭실대학교 대학원 기계공학과) ;
  • 성기수 (숭실대학교 대학원 기계공학과) ;
  • 김상명 (숭실대학교 대학원 기계공학과) ;
  • 이진욱 (숭실대학교 기계공학과)
  • Received : 2014.01.03
  • Accepted : 2014.04.15
  • Published : 2014.07.01
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Abstract

In this study, experimental approaching method was applied under and single-cylinder engine to research the performance of direct needle-driven piezo injector (DPI) for CR direct-injection. As key-point factor of this DPI that relies on direct-acting operating of injector needle, unlike conventional hydraulic-servo, its nozzle needle can be directly driven by piezo actuator. Thus, effect of direct-acting injection of DPI on diesel combustion and emission characteristics was investigated under common-rail single-cylinder direct-injection engine, equipped with three different driving mechanism, including indirect-acting solenoid, piezo and DPI system. As main results, it found that a direct-acting piezo injector has higher of IMEP. And it has higher heat release rate during premixed combustion and mixing controlled combustion phase due to its higher heat release, even though nitrogen oxide (NOx) formations were increased slightly.

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References

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