Assessment of the technical condition of electric-controlled diesel injectors according to the fuel supply characteristics

Introduction. Currently, there are no widely available technologies and equipment available at service stations and repair facilities to accurately assess the technical condition of Common Rail battery fuel supply system injectors. The methods implemented in practice mainly give a generalized assessment of the nozzle performance without identifying a specific defect, which entails an unjustified replacement of still working parts of electrically controlled injectors. The purpose of this article is to familiarize a wide range of specialists with a new non-slip test method for injectors with electronic control based on the evaluation of their fuel supply characteristics, which allows identifying specific malfunctions of the nozzle during the procedure of diagnostic without disassembling. Materials and Methods. The study is based on a systematic analysis of the factory methods for testing injectors, a review of modern scientific publications, the use of computer simulation in specialized programs, and experimental testing of the obtained results. Results. A method for testing and evaluating the technical condition of diesel injectors based on the fuel supply characteristics has been developed and tested that can significantly increase the information content of the diagnostic and reduce the overall labor intensity of repairing electronically controlled injectors by 24%. Discussion and Conclusion. The authors have developed and tested a measurement module and a test procedure for diesel injectors with the ability to assess the technical condition of their parts, which allows identifying and eliminating specific malfunctions of injectors without disassembling them and avoid unjustified replacement of serviceable elements during repair. The results of the study have been implemented in the Bosch Diesel Service fuel equipment repair center of Bashdiesel LLC.