Development of a Simulator for the Fuel Injecton Sysem of a Diesel Engine

Abstract

The governor of a diesel engine often induces self-oscillations called "hunting", associated with the fuel injection system of the engine. It is very troublesome, however, to investigate hunting phenomena using real engines. In the present study, a fuel injection system simulator has been developed. By replacing the engine with an analog computer and a hydrostatic transmission system, the characteristics of the engine were easily varied. The frequency characteristics of this simulator agreed fairly well with those of real engine below 1 Hz. Using this simulator, the authors investigated the effects of some parameters on the hunting phenomenon below 1000 rpm, where it is difficult to apply the conventional linear stability theory because or irregular injections.