# US 8,739,518 B2 · Controlling operation of exhaust of an engine including a particulate filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,739,518 B2 - Document ID: US8739518B2 - Status: Granted - Kind: B2 - Application number: 13/736,801 - Filed: 2013-01-08 - Published: 2013-05-16 - Granted: 2014-06-03 - Earliest claimed: 2009-09-29 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Michiel J. Van Nieuwstadt - Web page: https://patentgrep.com/patent/US8739518B2 ## CPC - F01N 3/0238: {for regenerating during engine standstill} - F01N 9/002: {of filter regeneration} - F02B 33/44: Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs - Y02T 10/40: Engine management systems - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Methods and systems for controlling operation of exhaust of an engine including a particulate filter are described. One example method includes generating compressed air during engine operation, and storing the compressed air. The method further includes, during or after engine shutdown, pushing the compressed air through the particulate filter using a pressure of the compressed air. ## Claims ### Claim 1 A method for controlling operation of exhaust of an engine including a particulate filter, comprising: generating compressed air during stoichiometric engine operation via a turbocharger and storing the compressed air; and maintaining the compressed air stored until a threshold temperature is reached after engine shutdown, and then pushing the compressed air through the particulate filter using a pressure of the compressed air. ### Claim 2 (depends on 1) The method of claim 1, wherein storing the compressed air includes storing the compressed air in an intake manifold of the engine. ### Claim 3 (depends on 2) The method of claim 2, further comprising, after engine shutdown, opening an HP-EGR valve, and wherein pushing the compressed air includes pushing the compressed air from the intake manifold through an HP-EGR system to the particulate filter to regenerate the particulate filter. ### Claim 4 (depends on 1) The method of claim 1, further comprising, after engine shutdown, adjusting an amount of the compressed air pushed through the particulate filter based on an exhaust gas sensor located between the engine and the particulate filter. ### Claim 5 (depends on 1) The method of claim 1, further comprising regenerating the particulate filter after engine shutdown conditions during engine rest by flowing air through the particulate filter from an engine output side of the particulate filter to an atmospheric side of the particulate filter. ### Claim 6 (depends on 5) The method of claim 5, further comprising continuing regeneration of the particulate filter after engine shutdown using the pressure of the compressed air. ### Claim 7 (depends on 2) The method of claim 2, further comprising, after engine shutdown, opening an LP-EGR valve and closing an HP-EGR valve, and where pushing the compressed air includes pushing the compressed air from the intake manifold, through an LP-EGR system, and through the particulate filter from an atmospheric side of the particulate filter to an engine output side of the particulate filter. ### Claim 8 (depends on 1) The method of claim 1, further comprising adjusting an engine operating parameter during an engine start subsequent to the engine shutdown, based on a particulate filter regeneration during or after the engine shutdown. ### Claim 9 (depends on 8) The method of claim 8, wherein the engine operating parameter is an air-fuel ratio of an initial combustion of the engine start. ### Claim 10 A method for controlling engine system with a cylinder, an intake manifold, and a particulate filter, comprising: compressing air in the intake manifold during engine operation via a turbocharger compressor with an intake throttle opening increased; storing the compressed air in the intake manifold by sealing the intake throttle closed; and during or after an engine shutdown, pushing the compressed air through the particulate filter via a pressure of the compressed air to regenerate the filter. ### Claim 11 (depends on 10) The method of claim 10, wherein the engine system further comprises one or more valves, the method further comprising adjusting an amount of air pushed through the particulate filter by adjusting the one or more valves. ### Claim 12 (depends on 11) The method of claim 11, wherein the engine system further comprises an HP-EGR system, the method further comprising adjusting the one or more valves to push the compressed air through the HP-EGR system to the particulate filter to regenerate the particulate filter. ### Claim 13 (depends on 11) The method of claim 11, wherein the engine system further comprises an LP-EGR system, the method further comprising adjusting the one or more valves to push the compressed air from the intake manifold through an LP-EGR passage, and through the particulate filter to an exhaust passage to regenerate the particulate filter. ### Claim 14 (depends on 11) The method of claim 11, wherein the one or more valves includes one or more of a throttle, a tailpipe valve, a compressor bypass valve, a turbine wastegate valve, an HP-EGR valve, and an LP-EGR valve. ### Claim 15 (depends on 11) The method of claim 11, further comprising initiating regeneration of the particulate filter during engine running conditions by flowing air through the particulate filter, and continuing the regeneration during or after engine shutdown by pushing the compressed air through the particulate filter via the pressure of the compressed air. ### Claim 16 A method for controlling operation of an engine exhaust including a particulate filter, comprising: generating compressed air during boosted engine operation by increasing intake throttle opening; storing the compressed air in an intake manifold during engine shutdown by sealing the intake throttle closed; maintaining the compressed air stored while shutting down an engine; and after engine shutdown and upon reaching a threshold filter temperature, pushing the compressed air through the particulate filter. ### Claim 17 (depends on 16) The method of claim 16 further comprising, during the pushing, closing an intake throttle upstream of a turbocharger compressor, wherein during engine operation exhaust flows through the particulate filter in a forward direction, and wherein pushing the compressed air includes opening a compressor bypass valve, opening an LP-EGR valve, closing an exhaust throttle valve downstream of the particulate filter, and pushing the compressed air in a reverse flow through the particulate filter. ### Claim 18 (depends on 16) The method of claim 16, wherein pushing the compressed air includes opening a turbocharger wastegate valve, and opening an HP-EGR valve.