Apparatus, system, and method for estimating particulate consumption
First Claim
1. An apparatus for estimating particulate consumption in a particulate filter, the apparatus comprising:
- an empirical boundary conditions module, the empirical boundary conditions module configured to store first and second boundary soot consumption rates each corresponding to defined operating conditions, wherein the first boundary soot consumption rate is associated with a first condition index value and the second boundary soot consumption rate is associated with a second condition index value;
a defined relationships module, the defined relationships module configured to store relationship information between a plurality of potential operating conditions, observed soot consumption rates at the plurality of operating conditions, and at least one of the first and second boundary soot consumption rates;
a condition index module, the condition index module configured to determine a current condition index value according to current operating conditions and the stored relationship information, wherein the current condition index value comprises a contribution of individual index values associated with each of the current operating conditions; and
a final output value module, the final output value module configured to compare the current condition index value with the first and second condition index values of the first and second boundary soot consumption rates to determine a final output value of current soot consumption rate.
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Abstract
An apparatus, system, and method are disclosed for robustly estimating soot oxidation rates on a particulate filter. The invention uses empirically measured soot consumption rates as defined boundary rates, and operates between those rates using theoretical relationships between soot consumption and various operating conditions. The invention may also operate outside the defined boundaries by extrapolating the theoretical relationships beyond the defined boundary. The invention thereby overcomes the inflexibility of empirical modeling by allowing reasonable estimates at points that are not explicitly measured, and it overcomes the sensitivity of theoretical models to non-idealities that are experienced in real applications.
31 Citations
16 Claims
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1. An apparatus for estimating particulate consumption in a particulate filter, the apparatus comprising:
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an empirical boundary conditions module, the empirical boundary conditions module configured to store first and second boundary soot consumption rates each corresponding to defined operating conditions, wherein the first boundary soot consumption rate is associated with a first condition index value and the second boundary soot consumption rate is associated with a second condition index value; a defined relationships module, the defined relationships module configured to store relationship information between a plurality of potential operating conditions, observed soot consumption rates at the plurality of operating conditions, and at least one of the first and second boundary soot consumption rates; a condition index module, the condition index module configured to determine a current condition index value according to current operating conditions and the stored relationship information, wherein the current condition index value comprises a contribution of individual index values associated with each of the current operating conditions; and a final output value module, the final output value module configured to compare the current condition index value with the first and second condition index values of the first and second boundary soot consumption rates to determine a final output value of current soot consumption rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 16)
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10. A signal bearing medium tangibly embodying a program of machine-readable instructions executable by a digital processing apparatus to perform operations to estimate the rate of particulate consumption in a particulate filter, the operations comprising:
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storing first and second boundary soot consumption rates determined according to defined operating conditions; storing relationship information between a plurality of potential operating conditions and the boundary soot consumption rates, the stored relationship information comprising a plurality of soot consumption ratios, each ratio comprising the soot consumption rate associated with a respective one of the plurality of potential operating conditions divided by the difference between the first and second boundary soot consumption rates; determining a condition index value determined according to current operating conditions and the stored relationship information; and combining the condition index value with the boundary soot consumption rates to produce a final output value of soot consumption rate. - View Dependent Claims (11, 12, 13, 14)
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15. An exhaust gas after-treatment system for determining the rate of soot consumption on a particulate filter, the system comprising:
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a particulate filter configured to capture particulate matter from an exhaust gas stream; a temperature sensor configured to estimate the particulate filter temperature; a flow rate sensor configured to estimate the mass flow rate of exhaust through the particulate filter; an O2 estimator configured to estimate the mass fraction of O2 through the particulate filter; a soot load estimator configured to estimate the soot loading on the particulate filter; and a controller configured to store a high rate of soot oxidation and a low rate of soot oxidation based on defined operating conditions, the high rate of soot oxidation being associated with a high rate condition index and the low rate of soot oxidation being associated with a low rate condition index, to store relationships between a plurality of potential operating conditions, observed soot consumption rates at the plurality of potential operating conditions, and at least one of the high and low soot oxidation rates, to determine a current conditions index determined according to current operating conditions, the current conditions index comprising a contribution of individual index values associated with each of the current operating conditions, and to compare the current conditions index with the high rate conditions index and low rate conditions index to determine a rate of soot consumption on the particulate filter.
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Specification