Engine control to reduce emissions variability
First Claim
1. A method of controlling an engine to reduce variability of engine exhaust emissions, comprising:
- sensing a concentration of an emission species in exhaust gases produced by the engine and generating a sensed emission species value representative thereof; and
controlling an engine control system set point as a function of the sensed emission species value.
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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.
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Citations
20 Claims
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1. A method of controlling an engine to reduce variability of engine exhaust emissions, comprising:
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sensing a concentration of an emission species in exhaust gases produced by the engine and generating a sensed emission species value representative thereof; and
controlling an engine control system set point as a function of the sensed emission species value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling an engine to reduce variability of engine exhaust emissions, comprising:
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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 system set point as a function of the sensed NOx value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 17, 18, 19, 20)
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16. A system for controlling an engine to reduce variability of engine exhaust emissions, comprising:
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a NOx concentration sensor in an exhaust of the engine generating a sensed NOx value representative thereof; and
a control unit which generates a base NOx value, calculates a NOx difference value by subtracting the base NOx value from the sensed NOx value, and modifies an engine control system set point as a function of the NOx difference value in order to reduce variability of NOx in the engine exhaust.
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Specification