Repotenciación del banco de pruebas CRDI del taller de maquinaria pesada y estudio de inyección de inyectores de tres diferentes marcas, para comprobar el funcionamiento de la pulverización, estanqueidad y las presiones de funcionamiento de los distintos inyectores

Abstract

The Heavy Machinery workshop at Automotive Engineering has a CRDI question bank that was disabled, which generated the need to repower it to allow the implementation of the three types of injectors from the Bosch, Denso and Delphi brands. The purpose was to study the type of injection offered by each of them. Therefore, the objective of the degree work was to improve the question bank, to provide students with practical knowledge about the operation of the injectors of the three brands. The methodology used in this degree work adopted an inductive approach, since it was based on the logical and scientific method of collecting real data through observations to obtain general conclusions. Thanks to this methodology, it was possible to obtain results related to the flow rate of the three types of injectors. It was observed that Denso type injectors consumed the greatest amount of diesel during the flow test, producing a higher volume compared to the other two types of injectors. Likewise, real values of the operation of the injector rail were obtained and it was demonstrated that the three types of injectors had a tightness of up to 1350 Bar, as verified on the question bank. For spray testing, manufacturers' manuals were consulted to perform corresponding firing angle and dispersion angle calculations, resulting in different spray patterns for the injectors. In summary, it was concluded that the original question bank, with ECU it had, was not capable of operating with Bosch and Delphi type injectors, so a pulse modulator was implemented to verify the operation of those injectors. In this way, allowing the observation of the real operation of each type of injector incorporated in the question bank.