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Engine Control to Reduce Emissions Variability

Abstract: 

A system and method of controlling an engine includes sensing a concentration of NOx in exhaust gases produced by the engine and generating a sensed NOx value representative thereof, and controlling an engine control set point as a function of the sensed NOx value. The system also calculates a NOx difference value by subtracting a base NOx value from the sensed NOx value, and if an absolute value of the difference value exceeds a threshold, modifying the set point as a function of the NOx difference value. The method also includes sensing engine RPM, sensing engine manifold absolute pressure (MAP), determining the NOx value as a function of sensed engine RPM and MAP.

Patent Number: 
6,581,571
Date Of Issue: 
06/24/2003
Inventors: 

John T. Kubesh; Daniel J. Podnar; John P. Latusek; Donald L. McCaw