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5.6 "Settings” window
Figure 9. "Settings" window
This window enables controller and application settings to be changed. The following options are
available:
Measured value
Lambda – lambda parameter is recommended to visualize measurements for spark-ignition
engines, as lambda does not depend on fuel type fed to the engine (lambda is always 1 for
stoichiometric mixture),
AFR – Air/Fuel Ratio) expresses the mass ratio of air to fuel present in the mixture; the value of
this parameter is not measured directly, but computed based on the value of lambda parameter
and type of fuel fed to the engine, thus requiring an appropriate fuel type to be selected (lambda
parameter for stoichiometric mixture depends on fuel type, and for example is 14.7 for gasoline),
Oxygen – oxygen content indicator is a known method of measurement visualization for
spontaneous combustion engines, since it allows the air-fuel ratio to be observed for a very wide
range of lean mixtures,
Fuel – used to indicate what fuel type is currently fed to the engine (only for computing AFR),
Sensitivity – when the oxygen sensor is installed to close to engine exhaust valves, the result of
measurement may change too rapidly, thus making its interpretation difficult; in such a case
sensitivity should be reduced to smooth rapid variations in measurements ,
Graph – enables the oscilloscope axis to be reversed to adapt measurement visualization to user's
preferences,
Normal – higher lambda values are shown at higher positions on the oscilloscope (leaner
mixture),
Reversed – lower lambda values are shown at higher positions on the oscilloscope (richer
mixture).
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