# US 10,480,460 B2 · EGR system with particle filter for a gasoline engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,460 B2 - Document ID: US10480460B2 - Status: Granted - Kind: B2 - Application number: 15/621,033 - Filed: 2017-06-13 - Published: 2017-09-28 - Granted: 2019-11-19 - Earliest claimed: 2014-12-17 - Assignees: Tenneco Inc. - Applicants: Tenneco GmbH - Inventors: Michael Fischer - Web page: https://patentgrep.com/patent/US10480460B2 ## CPC - F02M 26/35: with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters - F01N 3/2066: {Selective catalytic reduction [SCR]} - F02B 37/18: by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} - F02M 26/04: with a single turbocharger - 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 - F02M 26/07: Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced downstream of the compressor - F02M 26/15: in relation to engine exhaust purifying apparatus - F02M 26/16: with EGR valves located at or near the connection to the exhaust system - F02M 26/23: Layout, e.g. schematics - F02M 26/42: having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders - F02M 26/43: in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine - F02M 26/44: in which a main EGR passage is branched into multiple passages - Y02T 10/12: Improving ICE efficiencies - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - 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 An exhaust gas recirculation system for a gasoline engine, including an exhaust gas line, which can be connected to an exhaust manifold of the gasoline engine and which includes a turbine, and an inlet line, which can be connected to an intake manifold of the gasoline engine and which includes a compressor. A main exhaust gas catalytic converter is provided in the exhaust gas line, and at least one exhaust gas recirculation line_I is provided which branches off from the exhaust gas line upstream of the turbine and opens into the inlet line downstream of the compressor. At least one particle filter_I is provided which is placed in the exhaust gas recirculation line_I or in the exhaust gas line upstream of the exhaust gas recirculation line_I. The particle filter_I has a 3/Ox coating, and at least one cooler_I is provided within the exhaust gas recirculation line_I downstream of the at least one particle filter. ## Claims ### Claim 1 An exhaust gas recirculation system, comprising: an exhaust pipe, an inlet pipe, a main exhaust gas catalytic converter located in the exhaust pipe, a turbine located in the exhaust pipe, a compressor located in the inlet pipe, at least one exhaust gas recirculation pipe_II, which branches at the exhaust pipe and opens into the inlet pipe, and at least one particle filter_II located in the exhaust gas recirculation pipe_II, wherein the exhaust gas recirculation pipe_II branches at least one of upstream and downstream of the main exhaust gas catalytic converter, wherein, when the exhaust gas recirculation pipe_II branches upstream of the exhaust gas catalytic converter, the particle filter_II has a 3/Ox coating, oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2, and wherein, at least one cooler_II is provided inside the exhaust gas recirculation pipe_II downstream of the particle filter, and wherein the exhaust gas recirculation pipe_II branches at the exhaust pipe upstream of the turbine and opens in the inlet pipe upstream of the compressor. ### Claim 2 An exhaust gas recirculation system, comprising: an exhaust pipe, an inlet pipe, a main exhaust gas catalytic converter located in the exhaust pipe, a turbine located in the exhaust pipe, a compressor located in the inlet pipe, at least one exhaust gas recirculation pipe_II, which branches at the exhaust pipe and opens into the inlet pipe, and at least one particle filter_II located in the exhaust gas recirculation pipe_II, wherein the exhaust gas recirculation pipe_II branches at least one of upstream and downstream of the main exhaust gas catalytic converter, wherein, when the exhaust gas recirculation pipe_II branches upstream of the exhaust gas catalytic converter, the particle filter_II has a 3/Ox coating, oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2, and wherein, at least one cooler_II is provided inside the exhaust gas recirculation pipe_II downstream of the particle filter, and wherein the exhaust gas recirculation pipe_II branches at the exhaust pipe downstream of the turbine and opens in the inlet pipe upstream of the compressor. ### Claim 3 (depends on 2) The exhaust gas recirculation system according to claim 2, wherein the particle filter_II, which is located downstream of the exhaust gas catalytic converter in the exhaust gas recirculation pipe_II, has the 3/Ox-coating, oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2> or is free of the 3/Ox-coating. ### Claim 4 An exhaust gas recirculation system, comprising: an exhaust pipe, a turbine, an inlet pipe, a compressor, at least one exhaust gas recirculation pipe_I, which branches at the exhaust pipe upstream of the turbine and opens in the inlet pipe downstream of the compressor, and at least one particle filter_I, which is located in at least one of the exhaust gas recirculation pipe_I and in the exhaust pipe upstream of the exhaust gas recirculation pipe_I, wherein the particle filter_I has a 3/Ox-coating oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2, wherein the at least one particle filter_I is positioned upstream from at least one cooler_I provided inside the exhaust gas recirculation pipe_I, wherein at least one further exhaust gas recirculation pipe is provided, which branches at the exhaust gas recirculation pipe and opens into the inlet pipe, wherein, in the at least one further exhaust gas recirculation pipe, at least one further cooler is provided, and wherein the at least one further exhaust gas recirculation pipe opens in the inlet pipe upstream of the compressor. ### Claim 5 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein provided in the exhaust pipe is a turbine and in the inlet pipe is a compressor, wherein the exhaust gas recirculation pipe_I branches at the exhaust pipe upstream of the turbine and opens in the inlet pipe downstream of the compressor. ### Claim 6 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein the particle filter_I which is located in the exhaust gas recirculation pipe_I, is free of the 3/Ox-coating, and located upstream of the at least one particle filter_I is an additional exhaust gas catalytic converter inside the exhaust gas recirculation pipe_I. ### Claim 7 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein a charge-air cooler is present in the inlet pipe, and wherein at least one of the cooler_I inside the exhaust gas recirculation pipe_I and the charge-air cooler is configured as at least one of an exhaust gas engine cooling water cooler and as an exhaust gas low-temperature cooling water cooler, and is at least thermally separated from the particle filter. ### Claim 8 (depends on 7) The exhaust gas recirculation system according to claim 7, at least one of wherein a further cooler is provided inside the respective further exhaust gas recirculation pipe, and wherein a further cooler is located in the distribution pipe upstream of the respective further exhaust gas recirculation pipe. ### Claim 9 (depends on 7) The exhaust gas recirculation system according to claim 7, wherein the exhaust gas recirculation pipe_I and the further exhaust gas recirculation pipe are coupled by an adjustable valve, and wherein downstream of the adjustable valve a cooler is provided and/or downstream of the cooler a choke valve is provided. ### Claim 10 (depends on 7) The exhaust gas recirculation system according to claim 7, wherein in the respective further exhaust gas recirculation pipe a choke valve is provided, and wherein the choke valve is optionally located downstream of the at least one further cooler. ### Claim 11 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein the further exhaust gas recirculation pipe branches downstream of the first particle filter of the exhaust gas recirculation pipe_I. ### Claim 12 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein the cooler_I has, on the outlet side, an exhaust gas reference temperature Ta, wherein the exhaust gas reference temperature Ta is above a dew point of substances contained in the exhaust gas. ### Claim 13 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein arranged in the inlet pipe are two compressors, wherein the at least one further exhaust gas recirculation pipe opens between the two compressors. ### Claim 14 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein arranged in the inlet pipe are two compressors and at least two further exhaust gas recirculation pipes, which are connected in parallel by way of a common distribution pipe, branching at the exhaust gas recirculation pipe_I, wherein at least one further exhaust gas recirculation pipe opens at least one of upstream of at least one of the compressors, and downstream of at least one of the compressors. ### Claim 15 (depends on 14) The exhaust gas recirculation system according to claim 14, wherein as a supplement to the charge-air cooler, a fresh-air cooler is located in the inlet pipe, wherein the fresh-air cooler is located upstream of the opening of the exhaust gas recirculation pipe. ### Claim 16 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein a charge-air cooler and a charge-air choke valve are provided in the inlet pipe, wherein the opening of the exhaust gas recirculation pipe_I is located at least one of i) at downstream of a position for the charge-air cooler, ii) at downstream of a position for the charge-air choke valve, iii) at upstream of a position for the charge-air cooler, and at downstream of a position for the charge-air choke valve. ### Claim 17 (depends on 16) The exhaust gas recirculation system according to claim 16, wherein the fresh-air cooler exhibits on the outlet side a fresh air reference temperature Tf with 150° C.>=Tf>=90° C. and the charge-air cooler exhibits on the outlet side a charge-air reference temperature Tu, with 30° C.<=Tu<=40° C. ### Claim 18 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein a charge-air cooler is provided in the inlet pipe, wherein the opening of at least one further exhaust gas recirculation pipe is located upstream of a position for the charge-air cooler. ### Claim 19 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein a choke valve is provided in at least one of i) the exhaust gas recirculation pipe_I, and ii) in the exhaust gas recirculation pipe_II, by which, depending on the operating point, an exhaust gas mass flow is adjustable inside the exhaust gas recirculation pipe, and wherein the choke valve is located downstream of at least one of the particle filters, or downstream of the cooler and upstream of the cooler. ### Claim 20 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein the exhaust pipe has two parallel exhaust pipe sections connected to an adjustable valve for switching between the two parallel pipe sections, and wherein the exhaust gas catalytic converter is located in the exhaust pipe section, and in the parallel exhaust pipe section the particle filter is located, as well as the branch for the exhaust gas recirculation pipe_I. ### Claim 21 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein downstream of the main exhaust gas catalytic converter, a main particle filter is provided, which is free of a catalytically effective coating for the conversion of CO, HC and/or NOx. ### Claim 22 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein the exhaust gas recirculation pipe_I is allocated to one single cylinder outlet of a gasoline engine. ### Claim 23 (depends on 4) The exhaust gas recirculation system according to claim 4, wherein the turbine is configured as a VTG turbine. ### Claim 24 An assembly, comprising: a gasoline engine or exhaust gas system for a gasoline engine connected to an exhaust gas recirculation system comprising: an exhaust pipe attached to an exhaust manifold of the gasoline engine, a turbine, an inlet pipe connected to an inlet manifold of the gasoline engine, a compressor, at least one exhaust gas recirculation pipe_I, which branches at the exhaust pipe upstream of the turbine and opens in the inlet pipe downstream of the compressor, and at least one particle filter_I, which is located in the exhaust gas recirculation pipe_I or in the exhaust pipe upstream of the exhaust gas recirculation pipe_I, wherein the particle filter_I has a 3/Ox-coating oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2, wherein the at least one particle filter_I is positioned upstream from at least one cooler_I provided inside the exhaust gas recirculation pipe_I, wherein at least one further exhaust gas recirculation pipe is provided, which branches at the exhaust gas recirculation pipe and opens into the inlet pipe, wherein, in the at least one further exhaust gas recirculation pipe, at least one further cooler is provided, and wherein the at least one further exhaust gas recirculation pipe opens in the inlet pipe upstream of the compressor. ### Claim 25 (depends on 24) The gasoline engine according to claim 24, wherein the gasoline engine has a displacement exhibiting a volume Vh and with a compression volume Vk, wherein a compression ratio Vv=(Vh+Vk)/Vk is applied, with 15:1<=Vv<=10:1. ### Claim 26 (depends on 24) The gasoline engine according to claim 24, wherein the particle filter exhibits a total volume Vf, wherein for the total volume Vf the following applies: 0.1 Vh<=Vf<=1 Vh or 0.1 Vh<=Vf<=0.5 Vh or that a plurality of particle filters are provided, which together have the total volume Vf. ### Claim 27 An exhaust gas recirculation system, comprising: an exhaust pipe, an inlet pipe, a main exhaust gas catalytic converter located in the exhaust pipe, a turbine located in the exhaust pipe, a compressor located in the inlet pipe, at least one exhaust gas recirculation pipe_II, which branches at the exhaust pipe and opens into the inlet pipe, and at least one particle filter_II located in the exhaust gas recirculation pipe_II, wherein the exhaust gas recirculation pipe_II branches at least one of upstream and downstream of the main exhaust gas catalytic converter, wherein, when the exhaust gas recirculation pipe_II branches upstream of the exhaust gas catalytic converter, the particle filter_II has a 3/Ox coating, oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2, and wherein, at least one cooler_II is provided inside the exhaust gas recirculation pipe_II downstream of the particle filter, and wherein the exhaust gas recirculation pipe_II branches at the exhaust pipe downstream of the turbine and opens in the inlet pipe upstream of the compressor, and wherein a charge-air cooler is present in the inlet pipe, wherein at least one of the cooler_I inside the exhaust gas recirculation pipe_I and the charge-air cooler is configured as an exhaust gas engine cooling water cooler or as an exhaust gas low-temperature cooling water cooler, and is at least thermally separated from the particle filter. ### Claim 28 A method for the operation of a gasoline engine connected to an exhaust gas recirculation system comprising: an exhaust pipe attached to an exhaust manifold of the gasoline engine, a turbine, an inlet pipe connected to an inlet manifold of the gasoline engine, a compressor, at least one exhaust gas recirculation pipe_I, which branches at the exhaust pipe upstream of the turbine and opens in the inlet pipe downstream of the compressor, and at least one particle filter_I, which is located in the exhaust gas recirculation pipe_I or in the exhaust pipe upstream of the exhaust gas recirculation pipe_I, wherein the particle filter_I has a 3/Ox-coating oxidizing CO to CO2 and HC to H2O and reducing NOx to N2 and O2, wherein the at least one particle filter_I is positioned upstream from at least one cooler_I provided inside the exhaust gas recirculation pipe_I, wherein at least one further exhaust gas recirculation pipe is provided, which branches at the exhaust gas recirculation pipe and opens into the inlet pipe, and wherein, in the at least one further exhaust gas recirculation pipe, at least one further cooler is provided, and wherein the at least one further exhaust gas recirculation pipe opens in the inlet pipe upstream of the compressor, the method comprising the steps of: a) adjusting at least one of an EGR valve and early ignition angle adjustment via a control unit to achieve an exhaust gas recirculation rate during operation, at least for an HP-EGR and at least in a high-load range and at full load, to a value of up to 20%, up to 30%, up to 40% or up to 50%, and b) at least one of i) adjusting via the control unit a combustion center of gravity closer to a thermodynamically optimum value of 8° crank angle, ii) reducing a fuel quantity to be delivered to the gasoline engine, and iii) both i) adjusting via the control unit a combustion center of gravity closer to a thermodynamically optimum value of 8° crank angle and ii) reducing a fuel quantity to be delivered to the gasoline engine and a full-load enrichment is avoided. ### Claim 29 (depends on 28) The method according to claim 28, wherein at least one of the method steps a) and b) is repeated at least once.