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RESEARCH PAPERS: Internal Combustion: Diesel

Diesel Electro-injector: A Numerical Simulation Code

[+] Author and Article Information
P. Digesu, D. Laforgia

Istituto di Macchine ed Energetica, Polytechnic of Bari, Bari, Italy

J. Eng. Gas Turbines Power 117(4), 792-798 (Oct 01, 1995) (7 pages) doi:10.1115/1.2815466 History: Received June 01, 1994; Online November 19, 2007

Abstract

A simulation code of an electro-injector for diesel engines is presented with the preliminary parametric analysis carried out with the code. The simulation code is based upon the concentrated volume method as for the chambers of the system. Energy and flow rate conservation equations and dynamic equations are used for the movable parts of the system under stress or friction. The magnetic force acting on the electro-injector actuator has been calculated by means of a finite element simulation. The one-dimensional code simulated the propagation in feeding pipes and the control of the electro-injector. The program, in fact, uses the method of the characteristic equations to solve conservation equations, simulating the propagation in a pipe between two chambers. The sensitivity analysis has pointed out that the parameters that are influenced by the propagation in the pipes are: needle lift, injected flow rate, pressure in each chamber, and volume. The perturbations reduce the effective pressure of injection and are influenced by pipe lengths and diameters.

Copyright © 1995 by The American Society of Mechanical Engineers
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