Reducing the Cycle-Cycle Variability of a Natural Gas Engine Using Controlled Ignition Current
(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:
https://lup.lub.lu.se/record/4318408
- author
- Dahlström, Jessica LU ; Tunestål, Per LU and Johansson, Bengt LU
- organization
- publishing date
- 2013
- 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
- 2022-02-19 06:56:51
@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}},
keywords = {{Internal Combustion Engines; Ignition; Natural Gas}},
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}},
}