Electric current characteristics of the injector generating fuel doses
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Institute of Vehicles, Warsaw University of Technology.
Institute of Vehicles, Warsaw University of Technology
Submission date: 2018-06-02
Final revision date: 2018-09-30
Acceptance date: 2018-10-01
Online publication date: 2018-10-26
Publication date: 2018-10-10
Corresponding author
Krzysztof Więcławski   

Institute of Vehicles, Warsaw University of Technology., Narbutta, 84, 02-524 Warszawa, Polska
Diagnostyka 2018;19(4):59-64
In this article, the proposal for modelling the gas (fuel) injector based on observations of changes in the current during operation of the needle is presented. The aim of this work is indicating that the dosage characteristics can be mapped by means of the current characteristics. Moreover, observation of the current allows for determining the actual position of the needle. The time of the real fuel flow and the injector phase position can be determined with a microsecond resolution. The injector core inductance is a constant quantity but as a result of the needle movement and change in the permeability, inductance of the core varies depending on the needle position. These quantities, closely related to the current flowing through the coil, are described by means of differential equations resulting from the Kirchhoff’s law, due to which changes taking place can be substantiated. Control of the flux enables the precise controlling of the injector in the actual time, thanks to the employment of fast analogue-digital converters and phase are taken into consideration.
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