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Method of prediction of NOx mass flow in exhaust

  • US 7,155,331 B1
  • Filed: 12/14/2004
  • Issued: 12/26/2006
  • Est. Priority Date: 12/15/2003
  • Status: Expired due to Fees
First Claim
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1. A method for estimation of a NOx mass flow rate in a diesel engine exhaust stream, the method comprising:

  • (a) using a mathematical function to estimate the NOx mass flow rate, the mathematical function being one of;

    (i) Y=K1X1+K2, where Y is the estimated NOx mass flow level in mmol/second, X1 is the engine output in horsepower, K1 is a first constant, and K2 is a second constant;

    (ii) Y=K3X2+K4, where Y is the estimated NOx mass flow level in mmol/second, X2 is the engine intake pressure in PSI, K3 is a third constant, and K4 is a fourth constant;

    (iii) Y=K5eK6X3, where Y is the estimated NOx mass flow level in mmol/second, X3 is the engine'"'"'s turbo-outlet temperature in degrees Celsius, K5 is a fifth constant, and K6 is a sixth constant; and

    (iv) Y=K7eK8X4, where Y is the estimated NOx mass flow level in mmol/second, X4 is the percentage of oxygen in the engine'"'"'s outlet exhaust stream, K7 is a seventh constant, and K8 is an eighth constant.

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