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Reducing the Cycle-Cycle Variability of a Natural Gas Engine Using Controlled Ignition Current

Dahlström, Jessica LU ; Tunestål, Per LU and Johansson, Bengt LU (2013) SAE World Congress & Exhibition, 2013
Abstract
Running an internal combustion engine with diluted methane/air mixtures has a potential of reducing emissions and increasing efficiency. However, diluted mixtures need high ignition energy in a sufficiently large volume, which is difficult to accomplish. Increasing the spark duration has shown to be a promising way of delivering more energy into the diluted charge, but this requires a more sophisticated ignition system.



This work focuses on evaluating the effects regarding enhancing early flame development, reducing cyclic variations and extending the lean limit using a new capacitive ignition system as compared to a conventional inductive ignition system. The new system offers the opportunity to customise the spark by... (More)
Running an internal combustion engine with diluted methane/air mixtures has a potential of reducing emissions and increasing efficiency. However, diluted mixtures need high ignition energy in a sufficiently large volume, which is difficult to accomplish. Increasing the spark duration has shown to be a promising way of delivering more energy into the diluted charge, but this requires a more sophisticated ignition system.



This work focuses on evaluating the effects regarding enhancing early flame development, reducing cyclic variations and extending the lean limit using a new capacitive ignition system as compared to a conventional inductive ignition system. The new system offers the opportunity to customise the spark by altering the electric pulse train characteristics choosing the number of pulses, the length of the individual pulses as well as the time delay between them. Several different spark configurations were evaluated for the new capacitive system, including varying spark duration between approximately 0.5-1.2 ms and maximum current levels of 0.2-0.4 A.



Results show that longer spark duration and faster initial energy deposition has a positive effect on the lean limit and the combustion stability, while the current level shows little or no effect on these variables. The more advanced capacitive system is capable of delivering more energy and longer spark duration, resulting in reduced cyclic variations and enhanced early flame development. With the longer spark durations of the capacitive system the lean limit was extended from λ = 1.65 to approximately λ = 1.75. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Internal Combustion Engines, Ignition, Natural Gas
host publication
SAE Technical Paper Series
publisher
Society of Automotive Engineers
conference name
SAE World Congress & Exhibition, 2013
conference location
Detroit, Michigan, United States
conference dates
2013-04-16 - 2013-04-18
external identifiers
  • other:2013-01-0862
  • scopus:84881210955
ISSN
0148-7191
DOI
10.4271/2013-01-0862
project
Microwave-Assisted Ignition System for Reduced CO2 Emission
language
English
LU publication?
yes
id
f8073f01-8e26-4fa0-8308-961e4ab58241 (old id 4318408)
alternative location
http://papers.sae.org/2013-01-0862/
date added to LUP
2016-04-01 13:42:14
date last changed
2020-12-08 03:12:27
@inproceedings{f8073f01-8e26-4fa0-8308-961e4ab58241,
  abstract     = {Running an internal combustion engine with diluted methane/air mixtures has a potential of reducing emissions and increasing efficiency. However, diluted mixtures need high ignition energy in a sufficiently large volume, which is difficult to accomplish. Increasing the spark duration has shown to be a promising way of delivering more energy into the diluted charge, but this requires a more sophisticated ignition system.<br/><br>
<br/><br>
This work focuses on evaluating the effects regarding enhancing early flame development, reducing cyclic variations and extending the lean limit using a new capacitive ignition system as compared to a conventional inductive ignition system. The new system offers the opportunity to customise the spark by altering the electric pulse train characteristics choosing the number of pulses, the length of the individual pulses as well as the time delay between them. Several different spark configurations were evaluated for the new capacitive system, including varying spark duration between approximately 0.5-1.2 ms and maximum current levels of 0.2-0.4 A.<br/><br>
<br/><br>
Results show that longer spark duration and faster initial energy deposition has a positive effect on the lean limit and the combustion stability, while the current level shows little or no effect on these variables. The more advanced capacitive system is capable of delivering more energy and longer spark duration, resulting in reduced cyclic variations and enhanced early flame development. With the longer spark durations of the capacitive system the lean limit was extended from λ = 1.65 to approximately λ = 1.75.},
  author       = {Dahlström, Jessica and Tunestål, Per and Johansson, Bengt},
  booktitle    = {SAE Technical Paper Series},
  issn         = {0148-7191},
  language     = {eng},
  publisher    = {Society of Automotive Engineers},
  title        = {Reducing the Cycle-Cycle Variability of a Natural Gas Engine Using Controlled Ignition Current},
  url          = {http://dx.doi.org/10.4271/2013-01-0862},
  doi          = {10.4271/2013-01-0862},
  year         = {2013},
}