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Diesel Fuel Injection System Simulation and Experimental Correlation

1971; Linguagem: Inglês

10.4271/710569

2688-3627

E. Benjamin Wylie, Jay A. Bolt, Mohamed F. El-Erian,

Real-time simulation and control systems

A theoretical digital simulation of a conventional diesel fuel injection system was developed to study the problem of after-injection in diesel engines which results in increased exhaust emissions. The influence of wave propagation phenomena, pipe friction, and cavitation were included in the study. Computer results were compared with transient pressures measured on an actual fuel injection system operated on a test bench, and the comparisons showed the accuracy and validity of the simulation method. Analytical control methods were developed to help determine design means to control after-injection. One design change consisted of the addition of a control valve in the pump delivery chamber, while another involved the modification of the pump spill port. Pressures and flows were not significantly altered during the main injection period with either design change. The simulation program confirmed the ability of both design changes to control after-injection, and experimental data from a system with the pump spill port modified in accordance with theoretical design calculations provided satisfactory confirmation of the analyses.