# US 2013/0152557 A1 · Compact exhaust gas treatment unit with reaction agent addition and motor vehicle having an exhaust gas treatment unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0152557 A1 - Document ID: US20130152557A1 - Status: Published application - Kind: A1 - Application number: 13/770,072 - Filed: 2013-02-19 - Published: 2013-06-20 - Earliest claimed: 2010-08-18 - Assignees: Emitec Gesellschaft fur Emissionstechnologie mbH - Inventors: MARC BRUGGER - Web page: https://patentgrep.com/patent/US20130152557A1 ## CPC - B01D 53/94: by catalytic processes - F01N 3/035: with catalytic reactors - F01N 3/106: {Auxiliary oxidation catalysts} - F01N 3/108: {Auxiliary reduction catalysts} - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 3/2889: {with heat exchangers in a single housing} - F01N 13/009: {having two or more separate purifying devices arranged in series} - F01N 2240/02: a heat exchanger - F01N 2240/20: a flow director or deflector - F01N 2470/18: the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus - F01N 2470/22: Inlet and outlet tubes being positioned on the same side of the apparatus - F01N 2470/24: Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled - F01N 2610/02: the substance being ammonia or urea - F01N 2610/1453: Sprayers or atomisers; Arrangement thereof in the exhaust apparatus - Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters - Y02T 10/12: Improving ICE efficiencies - 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) - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An exhaust gas treatment unit at least includes an approach flow region, a diverting region, a backflow region and an outflow region disposed consecutively in terms of flow. The backflow region and the outflow region are disposed on an outer surface of the approach flow region and an addition unit for a reaction agent is disposed in the outflow region. A motor vehicle having an exhaust gas treatment unit is also provided. ## Claims ### Claim 1 An exhaust gas treatment unit, comprising: an approach flow region, a diverting region, a backflow region and an outflow region disposed in series in terms of flow; said approach flow region having an outer surface on which said backflow region and said outflow region are disposed; and an addition unit disposed in said outflow region and configured to add a reaction agent. ### Claim 2 (depends on 1) The exhaust gas treatment unit according to claim 1, wherein said addition unit is disposed to feed the reaction agent at least partially onto said outer surface of said approach flow region. ### Claim 3 (depends on 1) The exhaust gas treatment unit according to claim 1, wherein said outer surface is configured to be heated at least in part. ### Claim 4 (depends on 1) The exhaust gas treatment unit according to claim 1, which further comprises an exhaust gas flow direction, at least said backflow region having a flow cross section changing transversely to said exhaust gas flow direction. ### Claim 5 (depends on 1) The exhaust gas treatment unit according to claim 1, wherein said outer surface of said approach flow region has a surface area and at least one at least partial coating or a structure configured to increase said surface area of said outer surface. ### Claim 6 (depends on 1) The exhaust gas treatment unit according to claim 1, wherein said approach flow region has at least one heat transfer element configured to transfer heat in the exhaust gas to said outer surface. ### Claim 7 (depends on 1) The exhaust gas treatment unit according to claim 1, wherein said backflow region has at least one flow deflector configured to deflect or calm the exhaust gas. ### Claim 8 (depends on 1) The exhaust gas treatment unit according to claim 1, which further comprises: an oxidation catalytic converter disposed within a region of said approach flow region; said backflow region surrounding said approach flow region in said region having said oxidation catalytic converter; said diverting region configured to divert and pass an exhaust gas through said backflow region into said outflow region; said approach flow region having an upstream inflow region extending in the form of a tube through said outflow region to said outer surface; and said addition unit configured to apply a reducing agent or a reducing agent precursor to said outer surface. ### Claim 9 (depends on 1) A motor vehicle, comprising: an internal combustion engine; an exhaust line configured to receive exhaust gas from said internal combustion engine, said exhaust line having at least one exhaust gas treatment unit according to claim 1; and a device configured to supply a reaction agent to said at least one exhaust gas treatment unit.