In-situ fuel concentration measurement near spark plug in spark-ignition engines by 3.39 μM infrared laser absorption method

Eiji Tomita, Nobuyuki Kawahara, Sasdami Yoshiyama, Akihiko Kakuho, Teruyki Itoh, Yoshisuke Hamamoto

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

1 Citation (Scopus)

Abstract

Improving thermal efficiency and reducing the exhaust emissions of internal combustion engines have become crucial. Thus, it is important to determine the fuel concentration in the vicinity of the spark plug near the spark timing because initial combustion affects the following main combustion in spark-ignition engines. A fiber optic system linked to the optical sensor installed in the spark plug, by means of which light could pass through the combustion chamber, was developed to determine the fuel concentration near the spark plug using an IR absorption method. A He-Ne laser with a wavelength of 3.39 μm coinciding with the absorption line of hydrocarbons was utilized as a light source. By exchanging an ordinary spark plug for this spark plug with the optical sensor, successive measurement of fuel concentration before the spark timing near the spark plug was carried out in a port injection spark-ignition engine fueled with isooctane under the firing condition. The air/fuel ratio averaged for many cycles near the spark plug with this optical system agreed with that measured with a buret, which represented the mean value averaged over a protracted period. This sensor was also applied to determine air /fuel ratio quantitatively in a direct injection gasoline engine. As a result, it was clarified that the air/fuel ratio and its standard deviation near the spark plug had a strong relationship to the stable engine operation. Original is an abstract.

Original languageEnglish
Title of host publicationInternational Symposium on Combustion Abstracts of Accepted Papers
Pages10
Number of pages1
Publication statusPublished - 2002
Externally publishedYes
Event29th International Symposium on Combustion - Sapporo, Japan
Duration: Jul 21 2002Jul 26 2002

Other

Other29th International Symposium on Combustion
CountryJapan
CitySapporo
Period7/21/027/26/02

Fingerprint

Spark plugs
Infrared lasers
Internal combustion engines
Optical sensors
Electric sparks
Air
Engines
Direct injection
Combustion chambers
Optical systems
Fiber optics
Gasoline
Light sources
Hydrocarbons
Wavelength
Lasers
Sensors

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Tomita, E., Kawahara, N., Yoshiyama, S., Kakuho, A., Itoh, T., & Hamamoto, Y. (2002). In-situ fuel concentration measurement near spark plug in spark-ignition engines by 3.39 μM infrared laser absorption method. In International Symposium on Combustion Abstracts of Accepted Papers (pp. 10)

In-situ fuel concentration measurement near spark plug in spark-ignition engines by 3.39 μM infrared laser absorption method. / Tomita, Eiji; Kawahara, Nobuyuki; Yoshiyama, Sasdami; Kakuho, Akihiko; Itoh, Teruyki; Hamamoto, Yoshisuke.

International Symposium on Combustion Abstracts of Accepted Papers. 2002. p. 10.

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

Tomita, E, Kawahara, N, Yoshiyama, S, Kakuho, A, Itoh, T & Hamamoto, Y 2002, In-situ fuel concentration measurement near spark plug in spark-ignition engines by 3.39 μM infrared laser absorption method. in International Symposium on Combustion Abstracts of Accepted Papers. pp. 10, 29th International Symposium on Combustion, Sapporo, Japan, 7/21/02.
Tomita E, Kawahara N, Yoshiyama S, Kakuho A, Itoh T, Hamamoto Y. In-situ fuel concentration measurement near spark plug in spark-ignition engines by 3.39 μM infrared laser absorption method. In International Symposium on Combustion Abstracts of Accepted Papers. 2002. p. 10
Tomita, Eiji ; Kawahara, Nobuyuki ; Yoshiyama, Sasdami ; Kakuho, Akihiko ; Itoh, Teruyki ; Hamamoto, Yoshisuke. / In-situ fuel concentration measurement near spark plug in spark-ignition engines by 3.39 μM infrared laser absorption method. International Symposium on Combustion Abstracts of Accepted Papers. 2002. pp. 10
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