인가전압에 따른 피에조 인젝터의 분무 특성

Abstract

Piezo actuated injector is known to produce less NOx and PM in comparison with solenoid actuated injector. And it is because piezo actuated injector can be operated with higher injection pressure up to 2000 bar and multiple injection up to 7 times, which are enabled by its greater operating force and faster response time. Needle opening and closing of piezo actuated injector is determined by the movement of piezo stack directly, which is proportional to induced voltage. In this study, spray characteristics of piezo actuated injector with various induced voltage have been investigated by measuring injection rate and macroscopic images. Results showed that the rising slope of injection rate is steeper, spray tip penetration is greater and spray angle is larger with higher induced voltage.