METHODS OF INCREASING ACCURACY OF SOOT LOAD ESTIMATES
First Claim
1. A method of compensating for measurement inaccuracies in a filter, the method comprising:
- after a cleaning procedure on the filter that is intended to eliminate removable particulate matter from the filter, determining an estimate of removable particulate matter loading remaining in the filter after the cleaning procedure; and
determining a first disparate value by quantifying a difference between;
(1) the estimated removable particulate matter loading remaining in the filter after the cleaning procedure; and
(2) a reference value.
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Accused Products
Abstract
A method for improving the effectiveness of filters by increasing accuracy of an estimate of particulate matter loading remaining in the filter after cleaning. In one embodiment, the disclosed method includes removing soot from the DPF by cleaning, and measuring parameters for a set of predetermined criteria. The amount of soot present in the DPF is then estimated based on delta pressure. The resulting estimated soot load value accounts for the noise factors such as ash loading after extended operation. The value is then used to adjust for future measurements of soot loading in the DPF after subsequent regeneration treatments and/or used to diagnose the effectiveness of the cleaning. The method can also be applied to diagnostics of the DPF. When discrepancies between DPSLE and model-based soot load estimate are observed in healthy regenerations, failure modes such as plugged filter, extreme ash loading or substrate melting can be detected.
29 Citations
17 Claims
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1. A method of compensating for measurement inaccuracies in a filter, the method comprising:
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after a cleaning procedure on the filter that is intended to eliminate removable particulate matter from the filter, determining an estimate of removable particulate matter loading remaining in the filter after the cleaning procedure; and determining a first disparate value by quantifying a difference between; (1) the estimated removable particulate matter loading remaining in the filter after the cleaning procedure; and (2) a reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of diagnosing the healthiness of a regeneration of a diesel particulate filter, the method comprising:
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determining, over a time period of an active regeneration, an estimate of soot loading in the diesel particulate filter; determining whether predetermined criteria for the healthiness of the regeneration are met over the time period of the active regeneration, the regeneration being healthy when the predetermined criteria are met; and when the regeneration is determined to be healthy, verifying that the regeneration is healthy by determining whether the estimated soot loading in the diesel particulate filter is above a predefined threshold at an end of the time period of the active regeneration. - View Dependent Claims (15, 16, 17)
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Specification