Numerical Studies of Multiple-injection Fuel Mass Fluctuation in High Pressure Common Rail System

Abstract

The multiple-injection fuel mass fluctuation play a major role in precise controlling of multiple-injection in the high pressure common rail (CR) system. In order to obtain a deep insight into the multiple-injection fuel fluctuation phenomena, a common rail mathematical model was developed, including three sub-models for the hydraulics, the mechanics, and the electro-magnetic. For multiple injection events, Fundamental aspects of CR system dynamics were investigated, especially the water hammer pressure wave influences on multiple-injection fuel mass fluctuation. The mechanism of different multiple-injection fuel mass fluctuation characteristic among multiple-injections was investigated and explained by numerical procedure.