Engine control to reduce emissions variability

Details Engine control to reduce emissions variability Engine control to reduce emissions variability

F - Mech Eng,Light,Heat,Weapons

02

D

F02D 45/00 (2006.01) F02D 41/14 (2006.01) F02P 5/15 (2006.01)

Patent

CA 2382903

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.

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