Development of a simulator for the fuel injection system of a diesel engine.

The governor of a diesel engine often induces self-oscillations called "hunting", associated with the fuel injection system of the engine. It would be very troublesome, however, to investigate the hunting phenomena using real engines. In the present study, a fuel system simulator has been developed to vary the parameters with ease. By replacing the engine with an analog computer and a hydrostatic transmission system, the characteristics of the engine could be varied easily. The frequency characteristics of this simulator agreed very well to those of the real engine below 1 Hz. Using this simulator, the authors investigated the effects of some parameters on the hunting phenomena below 1000 rpm, where irregular injections often occurred, and to which the conventional linear stability theory could not be applied.