Cycle by cycle variability in emissions of a spark ignition engine

E. E. Milkins, H. C. Watson, L. C. Goldsworthy, Richard J. Hallworth

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The exhaust emissions from a single-cylinder spark ignition engine were measured as a function of burning time. Flame propagation time was measured with an ionization probe, and the exhaust gas was sampled with a gas sampling valve. Electronic control logic determined the cycles to be sampled, based on the flame propagation time. Tests were carried out at full throttle, for lean, optimum, and rich A/F. The exhaust components measured were CO, HC, O 2, H2, and N2 using a gas chromatograph. The emission most affected by CBCV is CO. Cycles that are either faster or slower than the mean cycle have increased CO, particularly at lean A/F where a five-fold difference in CO concentration was measured. HC emissions show a 150% change for the same conditions. For other than lean A/F operation, H2 was an exhaust product, up to 6% at rich A/F operation. It is well established that reductions in CBCV would improve efficiency and power output. Here it is established that a reduction in CBCV would also reduce overall CO and HC emissions, particularly for very lean operation.

Original languageEnglish
Title of host publicationAutomobile Engineering Meeting
DOIs
StatePublished - 1974
Externally publishedYes
EventAutomobile Engineering Meeting - Toronto, ON, Canada
Duration: Oct 21 1974Oct 25 1974

Other

OtherAutomobile Engineering Meeting
CountryCanada
CityToronto, ON
Period10/21/7410/25/74

Fingerprint

Internal combustion engines
Engine cylinders
Exhaust gases
Gases
Ionization
Sampling

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

Cite this

Milkins, E. E., Watson, H. C., Goldsworthy, L. C., & Hallworth, R. J. (1974). Cycle by cycle variability in emissions of a spark ignition engine. In Automobile Engineering Meeting https://doi.org/10.4271/741034

Cycle by cycle variability in emissions of a spark ignition engine. / Milkins, E. E.; Watson, H. C.; Goldsworthy, L. C.; Hallworth, Richard J.

Automobile Engineering Meeting. 1974.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Milkins, EE, Watson, HC, Goldsworthy, LC & Hallworth, RJ 1974, Cycle by cycle variability in emissions of a spark ignition engine. in Automobile Engineering Meeting. Automobile Engineering Meeting, Toronto, ON, Canada, 10/21/74. https://doi.org/10.4271/741034
Milkins EE, Watson HC, Goldsworthy LC, Hallworth RJ. Cycle by cycle variability in emissions of a spark ignition engine. In Automobile Engineering Meeting. 1974 https://doi.org/10.4271/741034
Milkins, E. E. ; Watson, H. C. ; Goldsworthy, L. C. ; Hallworth, Richard J. / Cycle by cycle variability in emissions of a spark ignition engine. Automobile Engineering Meeting. 1974.
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abstract = "The exhaust emissions from a single-cylinder spark ignition engine were measured as a function of burning time. Flame propagation time was measured with an ionization probe, and the exhaust gas was sampled with a gas sampling valve. Electronic control logic determined the cycles to be sampled, based on the flame propagation time. Tests were carried out at full throttle, for lean, optimum, and rich A/F. The exhaust components measured were CO, HC, O 2, H2, and N2 using a gas chromatograph. The emission most affected by CBCV is CO. Cycles that are either faster or slower than the mean cycle have increased CO, particularly at lean A/F where a five-fold difference in CO concentration was measured. HC emissions show a 150{\%} change for the same conditions. For other than lean A/F operation, H2 was an exhaust product, up to 6{\%} at rich A/F operation. It is well established that reductions in CBCV would improve efficiency and power output. Here it is established that a reduction in CBCV would also reduce overall CO and HC emissions, particularly for very lean operation.",
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