Modelling of Dynamic Responses of an Automotive Fuel Rail System, Part I: Injector

Modelling of Dynamic Responses of an Automotive Fuel Rail System, Part Ii: Entire System

“…The injectors connected in series are modelled in a similar manner as those of a single injector [1]. Assume that the #uid is homogeneous and incompressible and that fuel #owing through each line segment is unsteady and one-dimensional.…”

“…Their values can be determined by measuring the pressures and volume #ows through the "lters, given the cross-sectional areas of the injectors [1]. The loss factors K Lare correlated to the needle displacements x L measured with respect to the valve seats of the injectors.…”

“…The value of f LN is usually speci"ed and that of f LK can be approximated by an empirical formula [1]. …”

“…In Part I of this paper, the authors [1] developed a computer model for predicting pressure #uctuations inside an automotive fuel injector. There the injector was divided into three segments with a "lter at the top, a coil spring and needle assembly in the middle, and ori"ces at the bottom.…”

Diesel engine fuel injection monitoring using acoustic measurements and independent component analysis

“…Injection process induced noise and air-borne acoustic signals have been sporadically studied for many years. However, previous work has focused on topics other than the noise radiated from the injector itself [2,3,4]. The moving mass inside the injector is a small in the order of 15 grams, and this mass takes a very short time, in the order of 1-3 milliseconds, from the fully open to fully closed position.…”