# US 2019/0376476 A1 · Methods and systems for exhaust-gas recirculation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376476 A1 - Document ID: US20190376476A1 - Status: Published application - Kind: A1 - Application number: 16/434,083 - Filed: 2019-06-06 - Published: 2019-12-12 - Earliest claimed: 2018-06-07 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Vanco Smiljanovski; Joerg Kemmerling; Helmut Matthias Kindl; Andreas Kuske; Hanno Friederichs; Franz Arnd Sommerhoff; Frank Kraemer; Frank Wunderlich - Web page: https://patentgrep.com/patent/US20190376476A1 ## CPC - 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 - F02D 41/005: {according to engine operating conditions} - F02D 41/0065: {Specific aspects of external EGR control (constructional details of EGR system F02M26/00)} - F02M 26/19: Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system - F02M 26/50: Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities (arrangement or layout of EGR passages with means for cleaning or treating the recirculated gases F02M26/35; protection of EGR valves from damage F02M26/74) - F02D 2041/0067: {Determining the EGR temperature} - F02D 2200/021: Engine temperature - F02D 2200/0414: Air temperature - F02D 2200/0418: Air humidity - F02D 2200/101: Engine speed - Y02T 10/40: Engine management systems - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Methods and systems are provided for an exhaust-gas arrangement. In one example, a system may include a barrier dividing an intake passage into first and second portions to mitigate exhaust-gas recirculate mixing with charge air upstream of a compressor. ## Claims ### Claim 1 A system, comprising: an intake passage comprising a barrier configured to fluidly separate a first portion from a second portion; a LP-EGR passage configured to flow EGR to only the second portion; and a flap arranged in the second portion upstream of an outlet of the LP-EGR. ### Claim 2 (depends on 1) The system of claim 1, wherein the second portion is larger than the first portion. ### Claim 3 (depends on 1) The system of claim 1, wherein the barrier is upstream of a compressor relative to a direction of intake air flow. ### Claim 4 (depends on 1) The system of claim 1, wherein the first portion and the second portion merge directly upstream of a compressor. ### Claim 5 (depends on 1) The system of claim 1, wherein a controller comprises computer-readable instructions stored on non-transitory memory that when executed enable the controller to actuate the flap to a fully open position to flow charge air through the second portion. ### Claim 6 (depends on 5) The system of claim 5, wherein the instructions further enable the controller to actuate an EGR valve to an open position to flow LP-EGR to the second portion. ### Claim 7 A method, comprising: flowing charge air through only a first portion of an intake passage and LP-EGR through only a second portion of the intake passage when a LP-EGR temperature is less than a lower threshold temperature. ### Claim 8 (depends on 7) The method of claim 7, wherein the first portion is hermetically sealed from the second portion via a barrier arranged downstream of a throttle and upstream of a compressor. ### Claim 9 (depends on 7) The method of claim 7, further comprising adjusting a flap configured to adjust charge air flow through the second portion, wherein adjusting the flap comprises adjusting the flap from a fully closed position to a fully open position in response to an engine load being greater than or equal to a threshold load or to the LP-EGR temperature being greater than an upper threshold temperature. ### Claim 10 (depends on 9) The method of claim 9, further comprising actuating an EGR valve to a fully closed position in response to the engine load being greater than or equal to the threshold load. ### Claim 11 (depends on 9) The method of claim 9, further comprising flowing LP-EGR and charge air through the second portion in response to the LP-EGR temperature being greater than the upper threshold temperature. ### Claim 12 (depends on 9) The method of claim 9, further comprising adjusting the flap to a partially open position between the fully closed position and the fully open position in response to the LP-EGR temperature being between the lower threshold temperature and the upper threshold temperature. ### Claim 13 (depends on 12) The method of claim 12, wherein determining a magnitude of an opening of the partially open position is based on one or more of the LP-EGR temperature, a charge-air temperature, an ambient temperature, and humidity. ### Claim 14 An exhaust-gas recirculation arrangement, comprising: an intake passage comprising a barrier downstream of a throttle, wherein the barrier is biased relative to a central axis of the intake passage, wherein the barrier separates a first portion from a second portion; a low-pressure exhaust gas recirculation passage fluidly coupled to only the second portion, wherein the low-pressure exhaust gas recirculation passage comprises an exhaust gas recirculation valve; a flap arranged upstream of the low-pressure exhaust gas recirculation passage in the second portion relative to a direction of charge air flow; a compressor arranged directly downstream of the barrier; and a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to: adjust the exhaust gas recirculation valve to a fully closed position and the flap to a fully open position in response to an engine load being greater than a threshold load; adjust the exhaust gas recirculation valve to an open position and the flap to a fully closed position in response to the engine load not being greater than the threshold load and a low-pressure exhaust gas temperature being less than a lower threshold temperature; adjust the exhaust gas recirculation valve to an open position and the flap to a fully open position in response to the engine load not being greater than the threshold load and the low-pressure exhaust gas temperature being greater than an upper threshold temperature; and adjust the exhaust gas recirculation valve to an open position and the flap to a partially open position in response to the engine load not being greater than the threshold load and the low-pressure exhaust gas temperature being between the lower and upper threshold temperatures. ### Claim 15 (depends on 14) The exhaust-gas recirculation arrangement of claim 14, wherein a magnitude of an opening of the partially open position is based on one or more of the LP-EGR temperature and the charge air temperature. ### Claim 16 (depends on 15) The exhaust-gas recirculation arrangement of claim 15, wherein the magnitude increases as the LP-EGR temperature increases. ### Claim 17 (depends on 15) The exhaust-gas recirculation arrangement of claim 15, wherein the magnitude increases as the charge-air temperature increases. ### Claim 18 (depends on 14) The exhaust-gas recirculation arrangement of claim 14, wherein charge air in the first portion does not mix with charge air and low-pressure exhaust gas recirculate in the second portion. ### Claim 19 (depends on 14) The exhaust-gas recirculation arrangement of claim 14, wherein the barrier is one or more of a wall or a pipe, wherein a volume of the second portion is greater than a volume of the first portion. ### Claim 20 (depends on 14) The exhaust-gas recirculation arrangement of claim 14, wherein the first portion and the second portion are free of mixing devices.