SOOT LOAD ESTIMATION DURING IDLE OR LOW LOAD
First Claim
1. A system comprising:
- an engine;
an aftertreatment system including a particulate filter; and
a controller configured to;
receive engine operating conditions for the engine;
compare the engine operating conditions to one or more engine operating threshold values;
compare a time value since a last delta pressure soot load estimate process to a predetermined time threshold;
decrease a flow threshold value to a lower flow threshold value responsive to the time value being greater than or equal to the predetermined time threshold;
compare a flow amount to the lower flow threshold value;
activate a delta pressure soot load estimation process responsive to determining the flow amount is greater than or equal to the lower flow threshold value; and
calculate a combined soot load estimate using a delta pressure soot load estimation of the delta pressure soot load estimate process responsive to the lower flow threshold value.
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Accused Products
Abstract
A system can include an engine, an aftertreatment system with a particulate filter, and a controller. The controller is configured to compare a time value since a last delta pressure soot load estimate process to a predetermined time threshold. Responsive to the time value being greater than or equal to the predetermined time threshold, the controller decreases a flow threshold value to a lower flow threshold value. If the flow amount is greater than or equal to the lower flow threshold value, then the controller activates a delta pressure soot load estimation process. A combined soot load estimate is then calculated using a delta pressure soot load estimation of the delta pressure soot load estimate process responsive to the lower flow threshold value.
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Citations
25 Claims
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1. A system comprising:
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an engine; an aftertreatment system including a particulate filter; and a controller configured to; receive engine operating conditions for the engine; compare the engine operating conditions to one or more engine operating threshold values; compare a time value since a last delta pressure soot load estimate process to a predetermined time threshold; decrease a flow threshold value to a lower flow threshold value responsive to the time value being greater than or equal to the predetermined time threshold; compare a flow amount to the lower flow threshold value; activate a delta pressure soot load estimation process responsive to determining the flow amount is greater than or equal to the lower flow threshold value; and calculate a combined soot load estimate using a delta pressure soot load estimation of the delta pressure soot load estimate process responsive to the lower flow threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for intrusively increasing exhaust flow to update a delta pressure soot load estimate process comprising:
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comparing a time value since a last delta pressure soot load estimate process to a predetermined time threshold; decreasing a flow threshold value to a lower flow threshold value responsive to the time value being greater than or equal to the predetermined time threshold; increasing a flow amount in an aftertreatment system of the engine responsive to the time value being greater than or equal to the predetermined time threshold; comparing the increased flow amount to the lower flow threshold value; activating a delta pressure soot load estimation process responsive to determining the increased flow amount is greater than or equal to the flow threshold value; and calculating a combined soot load estimate using a delta pressure soot load estimation of the delta pressure soot load estimate process responsive to the lower flow threshold value. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An apparatus comprising a controller including:
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a mass-based soot load rate circuit configured to determine a mass-based soot load estimate for a particulate filter of an aftertreatment system; a delta pressure soot load estimation circuit configured to determine a delta pressure soot load estimate for the particulate filter of the aftertreatment system; a combined soot load estimate circuit configured to determine a combined soot load estimate for the particulate filter of the aftertreatment system based on the mass-based soot load estimate and the delta pressure soot load estimate; and a low flow soot operations circuit configured to; compare a time value since a last delta pressure soot load estimate to a predetermined time threshold; decrease a flow threshold value to a lower flow threshold value responsive to the time value being greater than or equal to the predetermined time threshold; increase a flow amount in the aftertreatment system of the engine responsive to the time value being greater than or equal to the predetermined time threshold; compare the increased flow amount to the lower flow threshold value; activate a delta pressure soot load estimation process of the delta pressure soot load estimation circuit responsive to determining the increased flow amount is greater than or equal to the lower flow threshold value; and calculate a combined soot load estimate using a delta pressure soot load estimation of the delta pressure soot load estimate process responsive to the lower flow threshold value. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification