Methods For Controlling The Operation Of A Particulate Filter
First Claim
1. A method of controlling the operation of a particulate filter in an exhaust gas after-treatment system, the method comprising:
- calculating a ratio of particulate loading rate to filter regeneration rate using a mass-based soot load estimation scheme;
comparing the ratio of particulate loading rate to filter regeneration rate to a predetermined threshold value; and
controlling operating conditions of the particulate filter to maintain the ratio of particulate loading rate to filter regeneration rate at a value above the predetermined threshold value.
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Abstract
A method of controlling the operation of a particulate filter in an exhaust gas after-treatment system may comprise calculating a ratio of particulate loading rate to filter regeneration rate using a mass-based soot load estimation scheme and comparing the ratio of particulate loading rate to filter regeneration rate to a predetermined threshold value. The method may further comprise controlling operating conditions of the particulate filter to maintain the ratio of particulate loading rate to filter regeneration rate at a value above the predetermined threshold value.
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Citations
18 Claims
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1. A method of controlling the operation of a particulate filter in an exhaust gas after-treatment system, the method comprising:
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calculating a ratio of particulate loading rate to filter regeneration rate using a mass-based soot load estimation scheme; comparing the ratio of particulate loading rate to filter regeneration rate to a predetermined threshold value; and controlling operating conditions of the particulate filter to maintain the ratio of particulate loading rate to filter regeneration rate at a value above the predetermined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling the operation of a particulate filter in an exhaust gas after-treatment system, the method comprising:
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measuring a pressure drop across the particulate filter; comparing the measured pressure drop to an estimated minimum pressure drop; and controlling operating conditions of the particulate filter to maintain the measured pressure drop at a value above the estimated minimum pressure drop, wherein the estimated minimum pressure drop is a pressure drop corresponding to a minimum soot load of the particulate filter that maintains a soot cake layer along substantially the entire length of the particulate filter. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification