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CATEGORIES:Engineering Department Acoustics/Combustion Studen
 t seminars
SUMMARY:Study of cycle-by-cycle air-to-fuel ratio determin
 ed from the exhaust gas composition and a novel fa
 st response device based on a wide band lambda sen
 sor - Simon Regitz (University of Cambridge)
DTSTART;TZID=Europe/London:20081120T120000
DTEND;TZID=Europe/London:20081120T130000
UID:TALK13455AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/13455
DESCRIPTION:Subject of this talk will be cyclic Air/Fuel ratio
  (AFR) measurements carried out with a novel devic
 e (fUEGO) based on a production Universal Exhaust 
 Gas Oxygen sensor\, but modified to give an improv
 ed frequency response. The results are compared to
  AFR calculated from a fast CO/CO2 analyser and a 
 fast response flame ionization detector (FID).\nTh
 e direct comparison of the two different methods f
 or determining the cyclic AFR reveals that the ele
 ctrochemical device is in reasonable agreement wit
 h the more complex carbon balance method and can p
 rovide reliable cyclic AFR measurements with a red
 uced requirement for equipment and data post proce
 ssing. The fUEGO however is sensitive to elevated 
 levels of uHC’s (unburned hydrocarbons) during mis
 fires or partial burns and readings during such si
 tuations usually show deviations compared to the c
 arbon balance method.\nThe frequency response of t
 he fUEGO is in the 6 - 12 milliseconds region\, de
 pending on the step size of the AFR step\, and alt
 hough this is slower than the fast CO/CO2 analyser
  and the fast FID\, cyclic resolution is possible 
 up to high engine speeds.
LOCATION:Language Unit Meeting Room
CONTACT:Carlo Quaglia
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