Stability evaluation of an accurately controllable multiple injection system

Aiming to further improve diesel engine fuel efficiency and exhaust emissions, we conducted tests of a newly devised rapidly operating secondary actuator that provides controllable multiple injection. Up to six shots per cycle were implemented under high-pressure injection. A high-speed camera and a flow rate metering system were used to obtain quantitative data regarding diesel spray and fuel flow dynamics. The advantages of the applied technique are very stable phasing, dwelling, duration, and dosing of multiple injection shots proved from data analysis.Abbreviations ARB Arbitrary waveform generator - CRIS Common rail injection system - DC Direct current - ECU Electronic control unit - EDU Electronic injection driving unit - fps Frames per second - HP High-pressure - LDA Laser Doppler anemometer (velocimeter) - ROSA Rapidly operating secondary actuator - RPM Revolutions per minute - SOI Start of injection - TDC Top dead center - TTL Transistor–transistor logic