This thesis explores the idea of igniting LPG in a compression ignition diesel engine
using pilot diesel injection as spark ignition medium. The main advancement in using
this technology on current diesel engines is the establishment of a better balance
between NOx and PM emissions without losing too much of the CO2 benefits of diesel.
With the advent of common rail diesel engines, it is now possible to get control of pilot
diesel injection and make the LPG and diesel control systems work together.
Combined diesel and LPG operation is a new subject for engine research, so the thesis
moves on to consider the results from detailed engine simulation studies that explore the
potential benefits of the mix. Subsequent simulations of a modern four cylinder dCi
engine suggest that with closer control over the pilot diesel injection, diesel like
performance can be obtained, hopefully with less emissions than currently expected
from diesel only operation.
A single cylinder variable compression ratio research engine was developed to explore
diesel /LPG dual fuel operation. A second generation common rail injection rig was also
developed for the engine and for fuel spray characterisation.
Engine experiments proved the concept of using a modest charge of pilot injected diesel
for igniting a larger dose of port injected LPG. The experimental work results suggest
that combining diesel common rail injection technology with the state of the art LPG
injection systems, it is possible to establish a better balance between NOx/ PM
emissions without losing too much of the CO2 benefits from the diesel operation.
| Identifer | oai:union.ndltd.org:CRANFIELD1/oai:dspace.lib.cranfield.ac.uk:1826/4507 |
| Date | 03 1900 |
| Creators | Theodoridis, Eudoxios |
| Contributors | Harrison, M. F. |
| Publisher | Cranfield University |
| Source Sets | CRANFIELD1 |
| Language | English |
| Detected Language | English |
| Type | Thesis or dissertation, Doctoral, PhD |
| Rights | © Cranfield University, 2009. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder. |
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