In the experiment the fuel temperature was adjusted in a high–
low–high pattern, which has resulted in an inverse pattern for the
concentration of both CO and C2H4 in the exhaust gas. Obviously
the two species show the same trend, but only C2H4 approaches
zero at high injection temperatures. The CO emission levels measured
by the Multor and FTIR are in fair agreement.
Normalized CO concentrations acquired in experiments 4 and 5
are given as function of the fuel injection temperature in Fig. 11. It
can be concluded that the fuel temperature has considerable