Fuel injector diagnostics based on observations of magnetic flux changes
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Institute of Vehicles, Warsaw University of Technology.
Institute of Vehicles, Warsaw University of Technology
Submission date: 2018-05-10
Final revision date: 2018-07-30
Acceptance date: 2018-08-07
Online publication date: 2018-08-07
Publication date: 2018-08-07
Corresponding author
Krzysztof Więcławski   

Institute of Vehicles, Warsaw University of Technology., Narbutta, 84, 02-524 Warszawa, Polska
Diagnostyka 2018;19(3):89-93
The article discusses mutual relations of the dosage characteristics, current intensity characteristics, and voltage characteristics in the fuel injector electromagnet. Changes in current in the electromagnet’s coil were monitored in the course of dosage by means of the Hall sensor. Change in the Hall voltage is proportional to the changes in density of the magnetic flux generated around the injector coil during its work. The model of the current dependencies was used to determine the injector technical state in the actual time. The presented diagnostics proposition was created on the basis of the injector dosage characteristics obtained due to experimental research. Change in characteristic values, recorded during generation of the fuel dose allows for determination of the injector technical state, regarding both, the current-related and the mechanical parameters. Controlling in the actual time enables corrections in control parameters as a response to changes, as well as quick detection of damage resulting in switching the injector off the operation. This prevents the faulty operation of the injector, which may result in damage to subsequent components depending on its operation, such as the catalytic reactor.
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