Method of compensating for injector aging
AssigneeInternational Engine Intellectual Property Company, LLC
InventorsMichael James McNulty, James E. Korenchan
Life of this patent
Estimating the term…
Abstract
A method of controlling a fuel injector is provided. Engine speed is monitored. Engine torque output is monitored. It is determined if the engine speed is within one of a plurality of predefined engine speed ranges. It is determined if the engine torque output is within one of a plurality of predefined engine torque output ranges. One of a plurality of injector coking factors is assigned based on the determined predefined engine speed range and the determined predefined engine torque output range. A total injector coking factor is calculated based upon total operating time within each of the plurality of injector coking factors. A duration of a fuel injection is increased based upon the calculated total injector coking factor.
Claims20
A method of controlling a fuel injector comprising:
- monitoring engine speed;
- monitoring engine torque output;
- determining if the engine speed is within one of a plurality of predefined engine speed ranges;
- determining if the engine torque output is within one of a plurality of predefined engine torque output ranges;
- assigning one of a plurality of injector coking factors based on the determined predefined engine speed range and the determined predefined engine torque output range;
- calculating a total injector coking factor based upon total operating time within each of the plurality of injector coking factors;
- and
- increasing a duration of a fuel injection based upon the calculated total injector coking factor.
A method of controlling a fuel injector comprising:
- monitoring at least one of engine torque output and engine speed;
- determining if at least one of the monitored engine torque output and engine speed is within one of a first predefined range, a second predefined range, and a third predefined range;
- monitoring an amount of time within one of the first predefined range, the second predefined range, and the third predefined range;
- assigning a first injector coking factor if the amount of time within the first predefined range exceeds a first preset time limit;
- assigning a second injector coking factor if the amount of time within the second predefined range exceeds a second preset time limit;
- assigning a third injector coking factor if the amount of time within the third predefined range exceeds a third preset time limit;
- calculating a total injector coking factor based upon total operating time within each of the first injector coking factor, the second injector coking factor, and the third injector coking factor;
- and
- increasing a duration of a fuel injection based upon the calculated total injector coking factor.
A method of controlling a fuel injector comprising:
- monitoring engine torque output;
- monitoring engine speed;
- assigning one of a plurality of coking factors based upon the monitored engine torque output and the monitored engine speed;
- determining an engine operating time at each assigned one of the plurality of coking factors;
- calculating a total injector coking factor;
- comparing the calculated total injector coking factor to a predetermined maximum coking factor;
- and
- increasing a duration of a fuel injection based upon one of the calculated total injector coking factor and the predetermined maximum coking factor.
Dependencies are inferred from the claim text.