Reductant dosing correction during no dosing periods
First Claim
1. A system, comprising:
- a NOx sensor; and
a controller configured to;
interpret a value of a first parameter indicative of an amount of NOx measured by the NOx sensor;
interpret a value of a second parameter indicative of a NOx value from a look-up table;
determine a correction factor based on the value of the first parameter and the value of the second parameter;
determine whether the determined correction factor is greater than or equal to a minimum threshold value; and
in response to the determined correction factor being greater than or equal to the minimum threshold value, update the NOx value from the look-up table based on the determined correction factor by replacing a previous NOx value with a corrected NOx value, and generate a dosing command based, at least in part, on the determined correction factor;
wherein the minimum threshold value is at least 5%.
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Accused Products
Abstract
A system may include a NOx sensor and a controller. The controller may be configured to interpret a value of a first parameter indicative of an amount of NOx measured by the NOx sensor and interpret a value of a second parameter for a NOx value from a look-up table. The controller may be further configured to determine a correction factor based on the value of the first parameter and the value of the second parameter and generate a dosing command based, at least in part, on the determined correction factor. In some implementations, the NOx value from the look-up table may be based on one or more operating conditions of an engine. In some implementations, the controller may be further configured to update a NOx value of the look-up table based on the determined correction factor.
12 Citations
19 Claims
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1. A system, comprising:
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a NOx sensor; and a controller configured to; interpret a value of a first parameter indicative of an amount of NOx measured by the NOx sensor; interpret a value of a second parameter indicative of a NOx value from a look-up table; determine a correction factor based on the value of the first parameter and the value of the second parameter; determine whether the determined correction factor is greater than or equal to a minimum threshold value; and in response to the determined correction factor being greater than or equal to the minimum threshold value, update the NOx value from the look-up table based on the determined correction factor by replacing a previous NOx value with a corrected NOx value, and generate a dosing command based, at least in part, on the determined correction factor; wherein the minimum threshold value is at least 5%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system, comprising:
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a NOx sensor; and a controller configured to; interpret a plurality of values of a first parameter indicative of amounts of NOx measured by the NOx sensor for a plurality of operating conditions; interpret a plurality of values of a second parameter indicative of NOx values from a look-up table for the plurality of operating conditions; determine a plurality of correction factors based on the plurality of values of the first parameter and the plurality of values of the second parameter; determine whether one or more correction factors of the determined plurality of correction factors are greater than or equal to a minimum threshold value; and in response to the one or more correction factors being greater than or equal to the minimum threshold value, update the NOx values of the look-up table based on the one or more correction factors by replacing previous NOx values with corrected NOx values, and generate a dosing command based, at least in part, on the one or more correction factors; wherein the minimum threshold value is at least 5%. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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determining a no-dosing period for an aftertreatment system; interpreting a plurality of values of a first parameter indicative of amounts of NOx measured by the NOx sensor for a plurality of operating conditions in response to determining the no-dosing period; interpreting a plurality of values of a second parameter for NOx values from a look-up table for the plurality of operating conditions of an engine; determining a plurality of correction factors based on the plurality of values of the first parameter and the plurality of values of the second parameter; determining whether one or more correction factors of the determined plurality of correction factors are greater than or equal to a minimum threshold value; in response to the one or more correction factors being greater than or equal to the minimum threshold value, updating the NOx values of the look-up table based on the one or more correction factors by replacing previous NOx values with corrected NOx values; generating a correction factor curve based, at least in part, on the determined plurality of correction factors; generating a dosing command based on a value from the correction factor curve; and transmitting the generated dosing command to a dosing module of the aftertreatment system to control dosing of reductant from the dosing module; wherein the minimum threshold value is at least 5%. - View Dependent Claims (18, 19)
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Specification