고압 연료분사용 피에조 액츄에이터 모델링 및 유압 동특성 해석

In this study, a piezo-driven injector, as a new method driven by piezoelectric energy, has been designed and investigated based on the concept of inverse piezo-electric effect to overcome the major drawbacks of conventional solenoid-driven injector. So it 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. The effects of an electric control between the solenoid valve and piezo-ceramic stack for injector needle’s driving on the dynamic characteristics were usually investigated. As this research results, we found that the input voltage exerted on piezo stack is the dominant factor and the piezo-driven injector has more degrees of freedom in controlling the fuel injection with the high pressure than a solenoid-driven injector.