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NOx emission-control system using a virtual sensor

  • US 20030216855A1
  • Filed: 05/15/2002
  • Published: 11/20/2003
  • Est. Priority Date: 05/15/2002
  • Status: Active Grant
First Claim
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1. A method for controlling NOx emissions of an engine, comprising:

  • determining predicted NOx values based on a model reflecting a predetermined relationship between control parameters and NOx emissions, wherein the control parameters include ambient humidity, manifold pressure, manifold temperature, fuel rate, and engine speed associated with the engine;

    adjusting the model based on a determination of whether the predicted NOx values meet a predetermined criteria associated with actual NOx values;

    storing the adjusted model in a memory associated with the engine; and

    reducing NOx emissions exhausted from the engine based on virtual NOx emission values determined from the adjusted model.

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