Pressure Fluctuation Characteristics of High-Pressure Common Rail Fuel Injection System

Abstract

In high-pressure common rail fuel injection system, fuel pressure wave propagates back and forth in the system during fuel injection, and the cycle fuel injection volume is affected by the fluctuation of fuel injection pressure. Therefore, to reduce the influence of pressure fluctuation on the cycle fuel injection volume fluctuation, it is of great theoretical significance to analyze the mechanism of pressure fluctuation and its influence law. In this chapter, the dynamic pressure fluctuation characteristics of the high-pressure common rail fuel injection system are analyzed based on the injector inlet pressure, and experimental research and theoretical analysis are carried out for the time domain and frequency domain characteristics of injector inlet pressure fluctuation, aiming at revealing the pressure fluctuation mechanism and its influence law, and providing theoretical support for improving the control accuracy of multiple injection cycle fuel injection volume.

Experiment investigation of injection parameters effects on injection stability of a high pressure common rail system

“…At present, there is relatively little research around the injection stability. Bai et al [13][14][15] have studied the injection stability. The main parameter they pay attention to is the cycle injection quantity.…”