Method of operating an engine
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United States of America Patent
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Nov 7, 2017
Grant Date -
Jun 9, 2016
app pub date -
Dec 4, 2014
filing date -
Dec 4, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A method of operating an engine is provided. The method includes determining a temperature and a pressure of intake air, and a temperature and a pressure of exhaust generated by the engine. The method includes determining a work performed by the engine based at least on an engine speed of the engine, and determining heating losses of the engine. The method includes determining an enthalpy of the intake air based at least on the work, the heating losses, a heating value of a fuel used for combustion within the engine, and the temperature and the pressure of the exhaust. The method includes determining a humidity value of the intake air based on the enthalpy, temperature and pressure of the intake air and determining an amount of NOx based on the humidity value. The method further includes controlling an operation of the engine based on the determined amount of NOx.
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