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Analysis of Hydraulic Characteristics of High Pressure Injector with Piezo Actuator  

Lee, Jin-Wook (Engine R&D Center, Korea Institute of Machinery and Materials)
Min, Kyoung-Doug (School of Mechanical & Aerospace Engineering, Seoul National University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.14, no.4, 2006 , pp. 164-173 More about this Journal
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
Piezo-driven injector; Hydraulic modeling; High pressure injector; Piezo actuator; AMESim code; CRDI system;
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