Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Analysis of Hydraulic Characteristics of High Pressure Injector with Piezo Actuator

피에조 액츄에이터 적용 고압 인젝터의 유압 동특성 해석

  • Lee, Jin-Wook (Engine R&D Center, Korea Institute of Machinery and Materials) ;
  • Min, Kyoung-Doug (School of Mechanical & Aerospace Engineering, Seoul National University)
  • 이진욱 (한국기계연구원 친환경엔진연구센터) ;
  • 민경덕 (서울대학교 기계항공공학부)
  • Published : 2006.07.01
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Abstract

In the electro-hydraulic injector for the common rail Diesel fuel injection system, the injection nozzle is being opened and closed by movement of a injector's needle which is balanced by pressure at the nozzle seat and at the needle control chamber, at the opposite end of the needle. In this study, the piezo actuator was considered as a prime movers in high pressure Diesel injector. Namely a piezo-driven Diesel injector, as a new method driven by piezoelectric energy, has been applied with a purpose to develop the analysis model of the piezo actuator to predict the dynamics characteristics of the hydraulic component(injector) by using the AMESim code. Aimed at simulating the hydraulic behavior of the piezo-driven injector, the circuit model has been developed and verified by comparison with the experimental results. As this research results, we found that the input voltage exerted on piezo stack is the dominant factor which affects on the initial needle behavior of piezo-driven injector than the hydraulic force generated by the constant injection pressure. Also we know the piezo-driven injector has more degrees of freedom in controlling the injection rate with the high pressure than a solenoid-driven injector.

Keywords

References

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