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Nira i7x - Engine Setup -> Fuel Specifications; Bv Fuel Density & Bv Fuel Density Corr; Fm Af Ratio (Fuel mass Air to Fuel Ratio)

Nira i7x
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© 2005-2016 Nira Control AB 77
Bv Fuel Density & Bv Fuel Density Corr
Bv Fuel Density gives the base value of the density in kg/L.
If fuel temperature is measured, it’s possible to compensate the fuel density
due to the temperature. The table Bv Fuel Density Corr gives a percentage
correction of the density. If the Bv Fuel Density Corr is equal to -6% the final
Fuel density is equal to Bv Fuel Density * (100 + Bv Fuel Density Corr)
Example:
Bv Fuel Density = 0,715 kg / L This value correspond to a fuel
temperature of 15 degrees Celsius.
The fuel temperature is measured to 55 degrees Celsius.
55 degrees Celsisus gives Bv Fuel Temperature Corr = -2.9%
The final fuel density used in calculations will be
0,715 * (1-0,029) = 0,694 kg / L
Fm Af Ratio (Fuel mass Air to Fuel Ratio)
Fm Af Ratio is the stoichiometric air to fuel ratio of the fuel you use.
The Air to Fuel ratio defines by “air mass” / “fuel mass”
Read more about AF, stoichiometric mixture and Lambda in Relationship
Between A/F and Lambda
Example of stoichiometric A/F ratios:
Air/98 Octane Gasoline = 14,6
Air/Methanol = 6,8
Air/Ethanol = 9,0
Air/E85 = 9,8
5.1.5 Engine Setup -> Sensors
All sensors that are necessary for engine control are found in this category.
Auxiliary sensor input is found under Mappings -> Aux Input

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