# US 10,502,152 B2 · Method for operating an engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,152 B2 - Document ID: US10502152B2 - Status: Granted - Kind: B2 - Application number: 15/728,270 - Filed: 2017-10-09 - Published: 2019-04-11 - Granted: 2019-12-10 - Earliest claimed: 2017-10-09 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Eric Matthew Kurtz; Eric James Kastanis - Web page: https://patentgrep.com/patent/US10502152B2 ## CPC - F02D 41/029: {the exhaust gas treating apparatus being a particulate filter} - F01N 3/023: using means for regenerating the filters, e.g. by burning trapped particles - F01N 3/106: {Auxiliary oxidation catalysts} - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 9/002: {of filter regeneration} - F01N 11/002: {the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus} - F02B 37/24: by using pumps or turbines with adjustable guide vanes - F02B 75/02: Engines characterised by their cycles, e.g. six-stroke - F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)} - F02D 41/0055: {Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus} - F02D 41/0065: {Specific aspects of external EGR control (constructional details of EGR system F02M26/00)} - F02D 41/0077: {Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position (EGR valve position sensor F02M26/48)} - F02M 26/05: High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor - F02M 26/06: Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor - F01B 7/14: acting on different main shafts - F01N 2430/00: Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics - F01N 2900/1602: Temperature of exhaust gas apparatus - F02B 75/28: Engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders (arranged oppositely relative to main shaft F02B75/24) - F02B 2075/025: {two} - F02D 2041/0017: {by simultaneous control of throttle and exhaust gas recirculation} - F02D 2200/0802: Temperature of the exhaust gas treatment apparatus - Y02T 10/12: Improving ICE efficiencies - Y02T 10/40: Engine management systems - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - 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) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F01B: MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES (of rotary-piston or oscillating-piston type F01C; of non-positive-displacement type F01D; internal-combustion engines F02B; combustion-product engine plants F02G; machines or engines, other than of positive-displacement type, for liquids F03B; positive-displacement engines driven by liquids F03C; wind motors F03D; positive-displacement machines for liquids F04B; rotary-piston, or oscillating-piston, positive-displacement machines for liquids F04C) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Methods and systems for operating an engine during and after regeneration of a particulate filter are described. In one example, exhaust flow is increased and exhaust temperature is decreased in response to ceasing regeneration of a particulate filter so that SCR efficiency may be improved in a short amount of time. ## Claims ### Claim 1 An engine operating method, comprising: determining ceasing regeneration of a particulate filter; and increasing boost pressure in an engine air intake via a controller while driver demand torque is substantially constant in response to ceasing regeneration of the particulate filter to increase a selective catalytic reduction catalyst (SCR) efficiency via cooling a temperature of the SCR below a first threshold temperature. ### Claim 2 (depends on 1) The engine method of claim 1, where boost pressure is increased via at least partially closing vanes of a turbocharger, and further comprising: increasing low pressure exhaust gas recirculation flow and decreasing high pressure exhaust gas recirculation flow in response to ceasing regeneration of the particulate filter. ### Claim 3 (depends on 1) The engine method of claim 1, further comprising opening an intake throttle in response to ceasing regeneration of the particulate filter and increasing a drive ratio of a supercharger compressor to increase the boost pressure. ### Claim 4 (depends on 3) The engine method of claim 3, further comprising closing an EGR cooler bypass valve in response to ceasing regeneration of the particulate filter. ### Claim 5 (depends on 4) The engine method of claim 4, further comprising closing a charge air cooler bypass valve in response to ceasing regeneration of the particulate filter. ### Claim 6 (depends on 5) The engine method of claim 5, further comprising closing a compressor bypass valve in response to ceasing regeneration of the particulate filter. ### Claim 7 (depends on 1) The engine method of claim 1, further comprising opening an exhaust throttle in response to ceasing regeneration of the particulate filter. ### Claim 8 An engine operating method, comprising: determining ceasing regeneration of a particulate filter; increasing boost pressure in an engine air intake via a controller while driver demand torque is substantially constant in response to ceasing regeneration of the particulate filter to increase a selective catalytic reduction catalyst (SCR) efficiency via cooling a temperature of the SCR below a first threshold temperature; and adjusting an EGR valve position based on the driver demand torque and engine speed in response to ceasing the regeneration of the particulate filter and before SCR temperature is less than the first threshold temperature. ### Claim 9 (depends on 8) The engine method of claim 8, where the EGR valve is a low pressure EGR valve, and further comprising: further adjusting the low pressure EGR valve to increase low pressure EGR flow; and increasing exhaust flow to a SCR in response to ceasing regeneration of the particulate filter, the exhaust flow increased before the SCR temperature is less than the first threshold temperature. ### Claim 10 (depends on 9) The engine method of claim 9, further comprising decreasing the exhaust flow to the SCR in response to the SCR temperature being less than the first threshold temperature. ### Claim 11 (depends on 10) The engine method of claim 10, further comprising injecting urea to the SCR in response to the SCR temperature being less than the first threshold temperature. ### Claim 12 (depends on 11) The engine method of claim 11, further comprising decreasing exhaust flow to the SCR in response to the SCR temperature being less than a second threshold temperature. ### Claim 13 An engine system, comprising: a two stroke opposed piston diesel engine including at least one cylinder; an exhaust system coupled to the two stroke engine including an oxidation catalyst, a selective catalytic reduction catalyst (SCR), and a particulate filter; and a controller including executable instructions stored in non-transitory memory to increase exhaust flow to the SCR via increasing boost pressure while driver demand torque is substantially constant in response to ceasing to regenerate the particulate filter and a SCR temperature being greater than a first threshold temperature, where the first threshold temperature is a temperature above which SCR efficiency is less than a threshold. ### Claim 14 (depends on 13) The engine system of claim 13, further comprising additional instructions to close a charge air cooler bypass valve and a supercharger bypass valve in response to ceasing to regenerate the particulate filter. ### Claim 15 (depends on 14) The engine system of claim 14, further comprising additional instructions to close an EGR cooler bypass valve in response to ceasing to regenerate the particulate filter. ### Claim 16 (depends on 13) The engine system of claim 13, further comprising additional instructions to reduce exhaust flow to the SCR in response to the SCR temperature being less than the first threshold temperature. ### Claim 17 (depends on 16) The engine system of claim 16, further comprising additional instructions to reduce exhaust flow to the SCR in response to the SCR temperature being less than a second threshold temperature. ### Claim 18 (depends on 17) The engine system of claim 17, further comprising injecting urea to the SCR in response to ceasing to regenerate the particulate filter and the SCR temperature being less than the first threshold temperature.