# US 11,306,642 B2 · Exhaust sensor baffle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,306,642 B2 - Document ID: US11306642B2 - Status: Granted - Kind: B2 - Application number: 16/454,600 - Filed: 2019-06-27 - Published: 2020-12-31 - Granted: 2022-04-19 - Earliest claimed: 2019-06-27 - Assignees: Faurecia Emissions Control Technologies, USA, LLC - Applicants: Faurecia Emissions Control Technologies, USA, LLC - Inventors: Neil Burge - Web page: https://patentgrep.com/patent/US11306642B2 ## CPC - B01D 53/9431: {Processes characterised by a specific device} - F01N 11/007: {the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus} - F01N 11/00: Monitoring or diagnostic devices for exhaust-gas treatment apparatus - F01N 13/008: {Mounting or arrangement of exhaust sensors in or on exhaust apparatus (sensor arrangements for engine control F02D41/1439)} - F01N 13/08: Other arrangements or adaptations of exhaust conduits {(pipes, joints or supports therefor in general F16L; collecting or removing exhaust gases of vehicle engines in workshops B08B15/00, on highways E01C1/005)} - B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas} - B01D 53/9495: {Controlling the catalytic process} - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 2550/02: Catalytic activity of catalytic converters - F01N 2560/026: for measuring or detecting NOx - Y02T 10/12: Improving ICE efficiencies - Y02T 10/40: Engine management systems - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An exhaust system includes an exhaust duct that defines an exhaust gas passage extending along an axis and which has a cross-section extending across the axis. At least one sensor opening in the exhaust duct is configured to receive an exhaust gas sensor. A baffle is positioned within the exhaust gas passage and includes a plurality of guide channels with open cross-sections. Each guide channel extends from a first end facing an inner surface of the exhaust duct to a second end opposite the first end. The guide channels guide exhaust gas from different regions of the cross-section toward the at least one sensor opening. ## Claims ### Claim 1 An exhaust system comprising: an exhaust duct defining an exhaust gas passage extending along an axis and having a cross-section extending across the axis; at least one sensor opening in the exhaust duct that is configured to receive an exhaust gas sensor; and a baffle positioned within the exhaust gas passage, the baffle including a plurality of guide channels with open cross-sections, each guide channel extending from a first end facing an inner surface of the exhaust duct to a second end opposite the first end, and wherein the guide channels guide exhaust gas from different regions of the cross-section toward the at least one sensor opening. ### Claim 2 (depends on 1) The exhaust system according to claim 1 wherein the open cross-sections have a U-shape or a C-shape. ### Claim 3 (depends on 1) The exhaust system according to claim 1 wherein at least one of the guide channels includes a plurality of holes and/or perforations. ### Claim 4 (depends on 1) The exhaust system according to claim 1 wherein the cross-section of the exhaust duct defines a plane that is perpendicular to the axis, and wherein one or more of the guide channels extend at an angle that is transverse to the plane. ### Claim 5 (depends on 1) The exhaust system according to claim 1 wherein each guide channel has first and second edges extending from the first end to the second end, and wherein each guide channel is defined by a length extending from the first end to the second end and a width extending from the first edge to the second edge, and wherein the width of one or more of the guide channels narrows in a direction toward the second end. ### Claim 6 (depends on 1) The exhaust system according to claim 1 wherein the baffle includes a body portion that is connected to the second ends of the guide channels, and wherein the body portion includes a curved outer edge that is configured to extend at least partially around a tip of the exhaust gas sensor. ### Claim 7 (depends on 1) The exhaust system according to claim 1 wherein each guide channel is defined by a length extending from the first end to the second end, and wherein at least one of the guide channels has a shorter length than another of the guide channels. ### Claim 8 (depends on 7) The exhaust system according to claim 7 wherein the plurality of guide channels comprises at least four guide channels and wherein two of the four guide channels have a first length and the other two of the four guide channels have a second length that is greater than the first length. ### Claim 9 (depends on 1) The exhaust system according to claim 1 including at least one SCR catalyst upstream of the sensor opening, and wherein the at least one sensor comprises a NOx sensor. ### Claim 10 An exhaust system comprising: an exhaust duct defining an exhaust gas passage extending along an axis and having a cross-section extending across the axis, and wherein the exhaust duct includes at least one sensor opening; at least one SCR catalyst upstream of the sensor opening; a NOx sensor mounted within the sensor opening and extending to a sensor tip that is within the exhaust gas passage; and a baffle positioned within the exhaust gas passage, the baffle including a plurality of guide channels with open cross-sections, each guide channel extending from a first end facing an inner surface of the exhaust duct to a second end opposite the first end, and wherein the guide channels guide exhaust gas from different regions of the cross-section toward the sensor tip. ### Claim 11 (depends on 10) The exhaust system according to claim 10 wherein the open cross-sections have a U-shape or a C-shape. ### Claim 12 (depends on 10) The exhaust system according to claim 10 wherein at least one of the guide channels includes a plurality of holes and/or perforations. ### Claim 13 (depends on 10) The exhaust system according to claim 10 wherein the cross-section of the exhaust duct defines a plane that is perpendicular to the axis, and wherein one or more of the guide channels extend at an angle that is transverse to the plane. ### Claim 14 (depends on 10) The exhaust system according to claim 10 wherein each guide channel has first and second edges extending from the first end to the second end, and wherein each guide channel is defined by a length extending from the first end to the second end and a width extending from the first edge to the second edge, and wherein the width of one or more of the guide channels narrows in a direction toward the second end. ### Claim 15 (depends on 10) The exhaust system according to claim 10 wherein the baffle includes a body portion that is connected to the second ends of the guide channels, and wherein the body portion includes a curved outer edge that extends at least partially around the sensor tip. ### Claim 16 (depends on 15) The exhaust system according to claim 15 wherein a first guide channel of the plurality of guide channels is positioned adjacent one end of the curved outer edge and a second guide channel of the plurality of guide channels is positioned adjacent an opposite end of the curved outer edge, and wherein the body portion includes a notch at each of the second ends of the first and second guide channels. ### Claim 17 (depends on 15) The exhaust system according to claim 15 wherein a center of the body portion is offset from the axis. ### Claim 18 (depends on 10) The exhaust system according to claim 10 wherein each guide channel is defined by a length extending from the first end to the second end, and wherein at least one of the guide channels has a shorter length than another of the guide channels. ### Claim 19 (depends on 18) The exhaust system according to claim 18 wherein the plurality of guide channels comprises at least four guide channels and wherein first and second guide channels of the four guide channels have a first length, and third and fourth guide channels of the four guide channels have a second length that is greater than the first length. ### Claim 20 (depends on 19) The exhaust system according to claim 19 wherein the third and fourth guide channels are positioned circumferentially between the first and second guide channels. ### Claim 21 (depends on 10) The exhaust system according to claim 10 wherein each guide channel is defined by a length extending from the first end to the second end, and wherein the open cross-section of each guide channel extends from the first end to the second end such that each guide channel is open to the exhaust gas passage along the length. ### Claim 22 (depends on 10) The exhaust system according to claim 10 wherein each guide channel has a base portion and a pair of opposing guide walls extending to distal edges that are spaced apart from each other by an open gap that extends along a length of each guide channel from the first end to the second end. ### Claim 23 (depends on 1) The exhaust system according to claim 1 wherein each guide channel is defined by a length extending from the first end to the second end, and wherein the open cross-section of each guide channel extends from the first end to the second end such that each guide channel is open to the exhaust gas passage along the length. ### Claim 24 (depends on 1) The exhaust system according to claim 1 wherein each guide channel has a base portion and a pair of opposing guide walls extending to distal edges that are spaced apart from each other by an open gap that extends along a length of each guide channel from the first end to the second end.