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%META:TOPICINFO{author="blundar" date="1085595240" format="1.0" version="1.1"}%
%META:TOPICPARENT{name="VolumetricEfficiency"}%
the Ideal Gas Law is an equation you may or may not remember from high school chemistry.
PV = nRT
- P = Pressure (must be an Absolute Pressure scale)
- V = Volume
- n = number of moles (number of atoms) gas
- R = ideal gas constant = 8.3145 J/mol K
- T = temperature (always in degrees Kelvin for this calculation - absolute scale)
The form of the ideal gas law most applicable to engine management is n = PV / RT By solving for n, we are solving for the actual airflow into the motor as estimated by pressure, temperature and volume factors measured elsewhere.
One random googled writeup from a college class: http://www.chm.davidson.edu/ChemistryApplets/GasLaws/GasConstant.html |
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