분사조건에 따른 커먼레일 디젤 인젝터의 분사율 특성에 관한 연구

Abstract

Recently, many studies on HSDI diesel engines have been performed to reduce the fuel consumption and CO2 emission. One of the prominent technique to reduce emission is a high pressure multiple injection. For this technique, the injection rate is a critical parameter in order to determine precise injection duration and timing for combustion control. Thus the purpose of this study was to investigate relationship between the injection rate and the time-signature of chamber pressure at diffeent injection pressure conditions in a common rail direct injection type injector using the Zeuch method. Using the measured correlation constants, estimated fuel injection rates are presented at many different injection conditions. Nomenclature: increase of the pressure (Pa): bulk modulus of the fuel: fuel injection rate (kg/s): amount of the fuel per a cycle (kg): volume of the chamber (m3): volume of the chamber (m3)