Design and characterization of an actuator test fixture for diesel fuel injectors
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Hossain, Syed Tanjid
issued: 2019-12-31T08:00:00Z
issued: 2018
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: The High-Pressure Direct Injection of Natural Gas in a diesel engine is one of the innovative solutions to reduce diesel engine pollutants. The quantity and quality of the fuel injected is highly depended on the spray pattern, which controls the air and NG fuel mixture in the combustion cylinder. Fuel release is regulated by a needle, that is linked to a solenoid actuator through a hydraulic system. An actuator with position feedback can control the spray pattern of a fuel injector by controlling the needle displacement of the injector. However, the relationship between the actuator displacement and injector needle displacement is unknown. Therefore, an Actuator Test Fixture (ATF) is designed that simulates the injection process of a typical hydraulically actuated fuel injector. It allows the researcher to study and ultimately model the relationship between actuator displacement and needle motion. In contrary to conventional fuel injectors, the ATF provides measurement access to all model parameters and allows their characterization. Thus, a characterized model is created that describes the relationship between the actuator displacement and ATF needle motion. The model of the ATF combines both the mechanical aspect of the components and the hydraulic mechanics of the fuel. There are two inputs to this model, the experimentally measured actuator displacement and experimentally measured supply pressure. ATF needle lift and control chamber pressures are the outputs of the model. The experimental-model comparison showed good agreement. The model is verified across several different operating points by varying the supply pressure and the actuator pulse duration to increase confidence in the experimental-model results. At high supply pressure, the model fits very well but as the pressure reduces the model starts to show discrepancy. This is likely due to un-modeled friction effects in the ATF. Nevertheless, the experimental-model control chamber pressures and needle lifts…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/68106
note: DESIGN AND CHARACTERIZATION OF AN ACTUATOR TEST FIXTURE FOR DIESEL FUEL INJECTORS by Syed Tanjid Hossain B.Eng. Hons., International Islamic University Malaysia, 2016 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Mechanical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) December 2018 © Syed Tanjid Hossain, 2018 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the dissertation entitled: DESIGN AND CHARACTERIZATION OF AN ACTUATOR TEST FIXTURE FOR DIESEL FUEL INJECTORS submitted by Syed Tanjid Hossain in partial fulfillment of the requirements for the degree of Master of Applied Science Examining Committee: Dr Rudolf Seethaler, School of Engineering, UBC Supervisor Dr. Homayoun Najjaran, School of Engineering, UBC Supervisory Committee Member Dr. Yang Cao, School of Engineering, UBC Supervisory Committee Member Dr. Sumi Siddiqua, School of Engineering, UBC University Examiner iii Abstract The High-Pressure Direct Injection of Natural Gas in a diesel engine is one of the innovative solutions to reduce diesel engine pollutants. The quantity and quality of the fuel injected is highly depended on the spray pattern, which controls the air and NG fuel mixture in the combustion cylinder. Fuel release is regulated by a needle, that is linked to a solenoid actuator through a hydraulic system. An actuator with position feedback can control the spray pattern of a fuel injector by controlling the needle displacement of the injector. However, the relationship between the actuator displacement and injector needle displacement is unknown. Therefore, an Actuator Test Fixture (ATF) is designed that simulates the injection process of a typical hydraulically actuated fuel injector. It allows the researcher to study and ultimately model the relationship between actuator displacement and needle…
has type: Thesis/Dissertation
date issued: 2019-02
is shown at: 10.14288/1.0375776
language: eng
degree discipline: Mechanical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/68106