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Fuel system characterization : an investigation into the effects associated with the manufacturing and testing of precision fuel system components
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Lillington, Richard (2013) Fuel system characterization : an investigation into the effects associated with the manufacturing and testing of precision fuel system components. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2692267~S1
Abstract
Every sub-component of a diesel injector must perform optimally to ensure maximum fuel
economy and minimum particulate and carbon-dioxide emissions. Continually developing
emissions standards will drive manufacturers to guarantee fuel system performance for a
significant period of the unit lifetime. Key to implementing such systems will be the ability
to compensate for unit changes in use. This thesis investigates possibilities for developing
existing unit and sub-component characterization techniques to enable robust performance
over an extended duration.
An overview of existing injector characterization techniques is given, along with possibilities
for enhancement of the existing state of the art through development of measurement
systems widely used within the industry. Particular attention is paid to developing methods
to allow testing of injectors and sub-components under representative conditions, where
system pressures of 3000 bar are commonplace. Consideration is given to the benefits of
moving from existing methods, based on steady-state testing, towards dynamic transfer
function testing, and methods reliant on real-time sub-system feedback, to enable better
characterization of the unit in use.
Key to the development of enhanced characterization will be feedback from the electrohydraulic
valves operating inside the injector. These valves are critical to current heavyduty
injector designs. To enable full understanding of the unit’s operation, the thesis
develops mathematical representations of such component’s functionality. Software
models of these systems are offered, and various model simulations discussed. Possibilities
for refining these are also provided.
Within this thesis the available mechanisms for taking valve position feedback
measurements capable of detecting valve lifts of <30 μm with suitable resolution and
accuracy are discussed. The results of experiments with various sensing devices are then
presented. Subsequently, novel methods for taking measurements using the unit stator as
a sensing element are developed, described in terms of mathematical models, and tested in
software simulations. Sensing experiments using valve hardware are then described.
The thesis closes with a discussion on important future trends in fuel system development.
Item Type: | Thesis (PhD) |
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Subjects: | T Technology > TJ Mechanical engineering and machinery |
Library of Congress Subject Headings (LCSH): | Diesel motor -- Fuel systems, Physical measurements, Detectors, Diesel motor -- Fuel systems -- Mathematical models |
Official Date: | July 2013 |
Institution: | University of Warwick |
Theses Department: | School of Engineering |
Thesis Type: | PhD |
Publication Status: | Unpublished |
Supervisor(s)/Advisor: | Chetwynd, D. G. (Derek G.), 1948-; Jones, R. Peter |
Extent: | x, 288 leaves : illustrations. |
Language: | eng |
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