Title page for ETD etd-82798-232857


Type of Document Master's Thesis
Author Slaughter, Raymond L. Jr.
Author's Email Address slaughte@stnick.me.vt.edu
URN etd-82798-232857
Title The Effects of Increased Ignition Energy on Cold Start Hydrocarbon Emissions
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Kornhauser, Alan A. Committee Chair
Nelson, Douglas J. Committee Member
Vandsburger, Uri Committee Member
Keywords
  • spark energy
  • start-up
Date of Defense 1998-09-10
Availability unrestricted
Abstract
A study on the effects of increased ignition energy on cold start hydrocarbon emissions was conducted. The tests were conducted on a single cylinder ASTM-CFR engine. The engine was outfitted with EFI, exhaust analyzers, and temperature probes. The engine was also modified to produce cold start conditions rapidly after each run. For the experiment the engine was started from 18° C using three increasing ignition energy levels. The first level of ignition energy was the ignition energy produced by the stock CFR engine's ignition system. The second and third increased ignition energy levels were obtained by adding 0.387 joules and 1.187 joules to the stock output through a supplementary ignition system. Startup emissions and the number of cycles until the first successful fire were measured.

The results of the tests show a 14% decrease in the average peak hydrocarbon (HC) concentration levels at the highest ignition energy. Overall reduction in HC was less. The variance in the peak HC levels was reduced at the highest ignition energy setting. CO production was increased in response to the increase in HC consumption. The spread in measured number of cycles until first fire was decreased at the highest ignition energy level.

Although positive results were obtained, the test apparatus had some problem areas that may have reduced the effectiveness of the high energy ignition system. Based on what was learned recommendations on apparatus refinements and further tests were included.

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  APPEND.PDF 269.98 Kb 00:01:14 00:00:38 00:00:33 00:00:16 00:00:01
  CHAPTER1.PDF 157.41 Kb 00:00:43 00:00:22 00:00:19 00:00:09 < 00:00:01
  CHAPTER2.PDF 360.61 Kb 00:01:40 00:00:51 00:00:45 00:00:22 00:00:01
  CHAPTER3.PDF 46.81 Kb 00:00:13 00:00:06 00:00:05 00:00:02 < 00:00:01
  CHAPTER4.PDF 228.91 Kb 00:01:03 00:00:32 00:00:28 00:00:14 00:00:01
  CHAPTER5.PDF 31.77 Kb 00:00:08 00:00:04 00:00:03 00:00:01 < 00:00:01
  REFER.PDF 23.07 Kb 00:00:06 00:00:03 00:00:02 00:00:01 < 00:00:01
  SLAUGHTERCONTENT.PDF 50.17 Kb 00:00:13 00:00:07 00:00:06 00:00:03 < 00:00:01
  VITA.PDF 17.03 Kb 00:00:04 00:00:02 00:00:02 00:00:01 < 00:00:01

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