[특허]System and method for particulate filter regeneration

GM Global Technology Operations LLC

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특허 상세정보

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System and method for particulate filter regeneration

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01N-003/00 F01N-003/10 F01N-003/20 F01N-009/00 F01N-003/023 F01N-003/025 F01N-003/029
출원번호	US-0289039 (2011-11-04)
등록번호	US-9046019 (2015-06-02)
발명자 / 주소	Larose, Jr., Thomas Van Buren, David Michael Catalogna, John A. Whitt, Christopher Darr, Rebecca J.
출원인 / 주소	GM Global Technology Operations LLC
대리인 / 주소	Cantor Colburn LLP
인용정보	피인용 횟수 : 0 인용 특허 : 5

초록
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In one exemplary embodiment of the invention, a method of regenerating a particulate filter includes flowing an exhaust gas from an internal combustion engine into a particulate filter and determining a particulate level in the particulate filter. The method also includes performing a primary regeneration when the particulate level is below a first value, the primary regeneration including flowing exhaust gas with a selected amount of hydrocarbons in the exhaust gas into the particulate filter, and performing a secondary regeneration when the particulate...

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1. A method of regenerating a particulate filter comprising: flowing an exhaust gas from an internal combustion engine into a particulate filter;determining a particulate level in the particulate filter;performing a primary regeneration when the particulate level is below a first value, the primary regeneration comprising flowing exhaust gas with a selected amount of hydrocarbons in the exhaust gas into the particulate filter;increasing, when the particulate level is above the first value, an amount of nitrogen oxide in the exhaust gas from the engine by at least one of reducing EGR flow to the engine and adjusting an engine air to fuel ratio to produce increased nitrogen oxide; andperforming a secondary regeneration when the particulate level is above the first value, the secondary regeneration comprising flowing exhaust gas from the engine with an increased amount of nitrogen oxide into the particulate filter,wherein the primary regeneration is performed when the particulate level is between 40 g and 70 g, and the secondary regeneration is performed when the particulate level is between 70 g and 75 g. 2. The method of claim 1, wherein the first value is greater than a second value comprising a particulate level at or below which the primary regeneration reduces the particulate level in the particulate filter to a normal particulate level. 3. The method of claim 2, wherein a range from the first value and a third value comprises particulate level at which the secondary regeneration reduces the particulate level in the particulate filter at or below the first value, wherein the first value is less than the third value. 4. The method of claim 3, comprising indicating to an operator that the particulate level is above an acceptable level for a regeneration operation and that service is needed when the particulate level is greater than the third value. 5. The method of claim 3, comprising indicating to an operator that service is needed when the secondary regeneration exceeds a time limit. 6. The method of claim 1, wherein flowing exhaust gas with the increased amount of nitrogen oxide into the particulate filter causes particulate level to be reduced to a normal level. 7. The method of claim 1, wherein flowing exhaust gas with the increased amount of nitrogen oxide into the particulate filter causes burning of particulates in the particulate filter at a temperature less than a temperature of the primary regeneration. 8. The method of claim 1, wherein determining the particulate level in the particulate filter comprises determining a pressure difference across the particulate filter. 9. An internal combustion engine system comprising: an internal combustion engine;an exhaust gas conduit in fluid communication with, and configured to receive an exhaust gas from, the internal combustion engine;a particulate filter configured to receive flow of the exhaust gas from the exhaust gas conduit; anda controller configured to: determine a particulate level in the particulate filter;generate a command to perform a passive regeneration when the particulate level is above a first value and below a second value, the passive regeneration comprising flowing exhaust gas with an increased amount of nitrogen oxide into the particulate filter;generate a command to cause the engine to produce increased amounts of nitrogen oxides when the passive regeneration occurs;generate a command to perform the passive regeneration for a predetermined amount of time;generate a command to notify an operator that service is needed when the particulate level is not reduced to the first value in the predetermined amount of time; andgenerate a command to perform a hydrocarbon regeneration when the particulate level is below the first value, the hydrocarbon regeneration comprising flowing exhaust gas with a selected amount of hydrocarbon in the exhaust gas into the particulate filter,wherein the hydrocarbon regeneration is performed when the particulate level is between 40 g and 70 g, and the passive regeneration is performed when the particulate level is between 70 g and 75 g. 10. The system of claim 9, wherein the first value is greater than a third value comprising a particulate level at or below which the hydrocarbon regeneration reduces the particulate level in the particulate filter to a normal level. 11. The system of claim 10, wherein a range from the first value to the second value comprises a particulate level at which the passive regeneration reduces the particulate level in the particulate filter at or below the first value, wherein the first value is less than the second value. 12. The system of claim 11, wherein the controller is configured to indicate to an operator that the particulate level is above an acceptable level for regeneration and service is needed when the particulate level is greater than the second value. 13. The system of claim 9, wherein the passive regeneration comprises flowing exhaust gas with the increased amount of nitrogen oxide into the particulate filter causes particulate level to be reduced to a normal range. 14. The system of claim 9, wherein the passive regeneration comprises flowing exhaust gas with the increased amount of nitrogen oxide into the particulate filter causing burning of particulates in the particulate filter at a temperature less than a temperature of a hydrocarbon regeneration. 15. The system of claim 9, wherein determining the particulate level in the particulate filter comprises determining a pressure difference across the particulate filter. 16. The system of claim 9, further comprising: a first oxidation catalyst positioned upstream of the particulate filter;a catalytic reduction device positioned upstream of the first oxidation catalyst;a second oxidation catalyst positioned upstream of the catalytic reduction device;a reductant injector in fluid communication with the exhaust gas conduit and configured to inject a reductant into the exhaust gas upstream of the particulate filter and downstream of the catalytic reduction device; anda hydrocarbon injector in fluid communication with the exhaust gas conduit and configured to inject a hydrocarbon into the exhaust gas upstream of the first oxidation catalyst and downstream of the second oxidation catalyst. 17. A method for regenerating an exhaust gas particulate filter system for an internal combustion engine having an exhaust gas conduit in fluid communication with, and configured to receive an exhaust gas from, the internal combustion engine, a particulate filter for removal of particulates from the exhaust gas; comprising: sensing a particulate level in the particulate filter;determining that the particulate has exceeded a level indicating the need for a passive regeneration of the particulate filter to burn particulates collected therein;causing an increase in an amount of nitrogen oxide in exhaust gas received by the particulate filter, wherein the amount of nitrogen oxide burns the particulates;determining that the particulate is below the level, thereby indicating the need for a primary regeneration of the particulate filter to burn the particulates collected therein; andcausing an increase in an amount of hydrocarbons in exhaust gas received by the particulate filter, wherein the amount of hydrocarbons facilitates burning the particulates,wherein the primary regeneration is performed when the particulate level is between 40 g and 70 g, the passive regeneration is performed when the particulate level is between 70 g and 75 g, and a service light is operated when the particulate level is above 75 g. 18. The method of claim 17, comprising: determining if the passive regeneration exceeds a selected time; andindicating the particulate level is above an acceptable limit and a particulate filter service is needed when the selected time is exceeded. 19. The system of claim 9, wherein the controller is further configured to generate the command to cause the engine to produce increased amounts of nitrogen oxides when the passive regeneration occurs by reducing an EGR flow to the engine and adjusting the engine to adjust an air to fuel ratio to produce increased nitrogen oxides.

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System and method for particulate filter regeneration

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System and method for particulate filter regeneration

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