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 for 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; and
generate a dosing command based, at least in part, on the determined correction factor.
1 Assignment
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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.
16 Citations
22 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 for 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; and generate a dosing command based, at least in part, on the determined correction factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 for NOx values from a look-up table for the plurality of operating conditions; determine plurality of correction factors based on the plurality of values of the first parameter and the plurality of values of the second parameter; and generate a dosing command based, at least in part, on a correction factor of the determined plurality of correction factors. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. 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 responsive 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; 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. - View Dependent Claims (21, 22)
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Specification