Methods For Estimating Particulate Load In A Particulate Filter, And Related Systems
First Claim
1. A method for regenerating a particulate filter, comprising:
- calculating a first estimated soot load of a particulate filter based on a pressure drop of an exhaust gas flowing through the particulate filter;
calculating a second estimated soot load of the particulate filter based on a mass balance of soot in the particulate filter;
calculating a hybrid estimated soot load based on the first estimated soot load and the second estimated soot load, wherein calculating the hybrid estimated soot load comprises applying at least one gate so as to weight a relative contribution of each of the first estimated soot load and the second estimated soot load to the hybrid estimated soot load; and
causing regeneration of the particulate filter when the hybrid estimated soot load is greater than or equal to a threshold value.
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Abstract
A method for regenerating a particulate filter may comprise calculating a first estimated soot load of a particulate filter based on a pressure drop of an exhaust gas flowing through the particulate filter, and calculating a second estimated soot load of the particulate filter based on a mass balance of soot in the particulate filter. The method may further comprise calculating a hybrid estimated soot load based on the first estimated soot load and the second estimated soot load, wherein calculating the hybrid estimated soot load comprises applying at least one gate so as to weight a relative contribution of each of the first estimated soot load and the second estimated soot load to the hybrid estimated soot load, and causing regeneration of the particulate filter when the hybrid estimated soot load is greater than or equal to a threshold value.
82 Citations
22 Claims
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1. A method for regenerating a particulate filter, comprising:
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calculating a first estimated soot load of a particulate filter based on a pressure drop of an exhaust gas flowing through the particulate filter; calculating a second estimated soot load of the particulate filter based on a mass balance of soot in the particulate filter; calculating a hybrid estimated soot load based on the first estimated soot load and the second estimated soot load, wherein calculating the hybrid estimated soot load comprises applying at least one gate so as to weight a relative contribution of each of the first estimated soot load and the second estimated soot load to the hybrid estimated soot load; and causing regeneration of the particulate filter when the hybrid estimated soot load is greater than or equal to a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for estimating soot load in a particulate filter, comprising:
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a temperature sensor, a pressure drop sensor, and at least one engine sensor; and at least one controller configured to receive signals from the temperature sensor, the pressure drop sensor, and the at least one engine sensor, and dynamically calculate both a pressure drop based soot load estimate and a mass balance based soot load estimate based on the signals, wherein the controller is configured to apply at least one gate to weight a relative contribution of each of the pressure drop based soot load estimate and the mass balance based soot load estimate to determine a hybrid soot load estimate. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for regenerating a particulate filter used for treating exhaust gas from a combustion engine, the method comprising:
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calculating a pressure drop based soot load estimate and a mass balance based soot load estimate; weighting each of the pressure drop based soot load estimate and the mass balance based soot load estimate based on a period of engine operation, the weighting yielding a weighted pressure drop based soot load estimate and a weighted mass balance based soot load estimate; calculating a soot load estimate based on the weighted pressure drop based soot load estimate and the weighted mass balance based soot load estimate; and causing regeneration of the particulate filter when the hybrid estimated soot load is greater than or equal to a threshold value. - View Dependent Claims (20, 21)
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22. A method for regenerating a particulate filter, comprising:
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calculating a first estimated soot load of a particulate filter based on a pressure drop of an exhaust gas flowing through the particulate filter; calculating a second estimated soot load of the particulate filter based on a mass balance of soot in the particulate filter; calculating a hybrid estimated soot load based on the first estimated soot load and the second estimated soot load, wherein calculating the hybrid estimated soot load comprises; applying a gate so as to weight a relative contribution of each of the first estimated soot load and the second estimated soot load to the hybrid estimated soot load; and applying a filter to filter dynamic fluctuations corresponding to the hybrid estimated soot load; wherein the gate is based on one or more of exhaust temperature, exhaust flow rate, bed temperature, soot uniformity, pressure drop, oxidation rate, soot load rate, flow stability, pressure stability, filter history, and regeneration conditions; and causing regeneration of the particulate filter when the hybrid estimated soot load is greater than or equal to a threshold value.
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Specification