A Procedure for Upgrading an Electronic Control Diesel Fuel Injection System by Considering Several Engine Operating Regimes Simultaneously

[+] Author and Article Information
B. Kegl

University of Maribor, Faculty of Mechanical Engineering, Smetanova 17 2000, Maribor, Slovenia

J. Mech. Des 121(1), 159-165 (Mar 01, 1999) (7 pages) doi:10.1115/1.2829416 History: Received October 01, 1997; Revised November 01, 1998; Online December 11, 2007


This paper describes an optimal design procedure for improving the injection rate histories of an electronic control diesel fuel injection system (ECD-FIS) with sleeve-timing-controlled pump. The research objective was to develop an approach for upgrading an existing ECD-FIS by performing only some low-cost modifications on its design. Therefore, the design variables are related to a relative small number of geometrical and control parameters of the injection system. The geometrical parameters influence only the shape of a rational Bézier curve, representing the cam profile of the pump. The control parameters influence the injection timing and injection quantity. These control parameters are introduced into the set of design variables in order to enable good results over the whole engine operating regime. The design problem is formulated in a form of a non-linear problem of mathematical programming. Several operating regimes are simultaneously taken into account by an appropriate objective function while some geometrical properties of the cam profile as well as some injection parameters are kept within acceptable limits by the imposed constraints. The theory is illustrated with a numerical example.

Copyright © 1999 by The American Society of Mechanical Engineers
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