Advanced science.  Applied technology.


Estimation of Engine-Out NOX for Real Time Input to Exhaust Aftertreatment Controller: 7,779,680


A method and system for estimating engine-out NOx from a diesel engine. The estimation is calculated from a mathematical model that expresses engine-out NOx as functions of cylinder pressure, intake oxygen, and effective temperature, respectively. Input data for each of these functions may be obtained from fuel quantity data and from measured data, the latter including intake pressure, cylinder pressure, intake oxygen concentration, coolant temperature, and intake manifold temperature.

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Shizuo Sasaki; Jayant V. Sarlashkar; Gary D. Neely