# US 2014/0150759 A1 · Engine Including External EGR System > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0150759 A1 - Document ID: US20140150759A1 - Status: Published application - Kind: A1 - Application number: 13/693,140 - Filed: 2012-12-04 - Published: 2014-06-05 - Earliest claimed: 2012-12-04 - Assignees: GM Global Technology Operations LLC - Applicants: GM Global Technology Operations LLC - Inventors: B. Jerry SONG; Eric F. GRIMMINGER; Cedric D. ARMAND - Web page: https://patentgrep.com/patent/US20140150759A1 ## CPC - F02M 26/19: Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system - F02D 9/02: concerning induction conduits (throttle valves, or arrangements thereof in conduits F02D9/08) - F02M 26/15: in relation to engine exhaust purifying apparatus - F02M 26/23: Layout, e.g. schematics - 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) ## Abstract An engine assembly includes an engine structure defining a combustion chamber. An intake system includes an intake manifold in communication with the combustion chamber. An exhaust system includes an exhaust conduit in communication with the combustion chamber. An exhaust gas recirculation system includes an EGR tube providing communication between the intake and exhaust systems, the EGR tube includes an end portion extending a distance into the intake system in a direction opposing air flow to the intake manifold. ## Claims ### Claim 1 An engine assembly comprising: an engine structure defining a combustion chamber; an intake system including an intake manifold in communication with the combustion chamber; an exhaust system including an exhaust conduit in communication with the combustion chamber; and an exhaust gas recirculation system including an EGR tube providing communication between the intake and exhaust systems, the EGR tube including an end portion extending a distance into the intake system in a direction opposing air flow to the intake manifold. ### Claim 2 (depends on 1) The engine assembly of claim 1, wherein the end portion of the EGR tube extends generally parallel to a flow direction of intake air within the intake system. ### Claim 3 (depends on 1) The engine assembly of claim 1, wherein the intake system includes a throttle valve adapted to control air flow to the intake manifold and the end portion of the EGR tube extends into the intake system at a location between the intake manifold and the throttle valve, the end portion of the EGR tube extending within the intake system in a direction toward the throttle valve. ### Claim 4 (depends on 3) The engine assembly of claim 3, wherein a longitudinal end of the end portion of the EGR tube facing the throttle valve is closed and the end portion of the EGR tube includes at least one opening extending through a side wall of the EGR tube within the intake system. ### Claim 5 (depends on 4) The engine assembly of claim 4, wherein the longitudinal end of the EGR tube is spaced a distance from a pivot region of the throttle valve. ### Claim 6 (depends on 5) The engine assembly of claim 5, wherein the at least one opening is spaced a distance from the pivot region of the throttle valve. ### Claim 7 (depends on 1) The engine assembly of claim 1, wherein the end portion of the EGR tube defines at least one opening extending through a side wall of the EGR tube. ### Claim 8 (depends on 7) The engine assembly of claim 7, wherein the at least one opening has an effective diameter at least equal to the effective diameter of the end portion the EGR tube to produce no significant pressure loss as a result of exhaust gas flow through the at least one opening. ### Claim 9 (depends on 1) The engine assembly of claim 1, wherein the intake system defines a concentric flow path surrounding the end portion of the EGR tube. ### Claim 10 (depends on 1) The engine assembly of claim 1, wherein the end portion of the EGR tube includes a closed end defining a rounded profile. ### Claim 11 (depends on 10) The engine assembly of claim 10, wherein the intake system includes a throttle valve adapted to control air flow to the intake manifold and the end portion of the EGR tube extends into the intake system at a location between the intake manifold and the throttle valve, the end portion of the EGR tube extending within the intake system in a direction toward the throttle valve with the closed end of the EGR tube facing the throttle valve. ### Claim 12 (depends on 11) The engine assembly of claim 11, wherein the end portion of the EGR tube includes at least one opening extending through a side wall of the EGR tube within the intake system, the throttle valve and the closed end of the EGR tube being adapted to induce a turbulent flow field in the intake system at the at least one opening. ### Claim 13 (depends on 1) The engine assembly of claim 1, wherein a concentric flow path is defined by the intake system around a perimeter of the end portion of the EGR tube. ### Claim 14 (depends on 13) The engine assembly of claim 13, wherein the end portion of the EGR tube extends parallel to a flow direction of intake air within the intake system and includes a closed end and at least one opening extending through a side wall of the EGR tube and facing a direction perpendicular to the flow direction of intake air within the intake system. ### Claim 15 An engine assembly comprising: an engine structure defining a combustion chamber; an intake system including an intake manifold in communication with the combustion chamber and a throttle valve adapted to control air flow to the intake manifold; an exhaust system including an exhaust conduit in communication with the combustion chamber; and an exhaust gas recirculation system including an EGR tube in communication with the intake and exhaust systems, the EGR tube including an end portion extending a distance into the intake system at a location between the throttle valve and the intake manifold, the end portion extending in a direction opposing air flow to the intake manifold and parallel to the air flow, the end portion defining a closed longitudinal end having a rounded profile proximate to the throttle valve with at least one opening extending through a side wall of the end portion of the EGR tube. ### Claim 16 (depends on 15) The engine assembly of claim 15, wherein the longitudinal end of the EGR tube is spaced a distance from a pivot region of the throttle valve. ### Claim 17 (depends on 16) The engine assembly of claim 16, wherein the at least one opening is spaced a distance from the pivot region of the throttle valve. ### Claim 18 (depends on 15) The engine assembly of claim 15, wherein the at least one opening has an effective diameter at least equal to the effective diameter of the end portion the EGR tube to produce no significant pressure loss as a result of exhaust gas flow through the at least one opening. ### Claim 19 (depends on 15) The engine assembly of claim 15, wherein the intake system defines a concentric flow path surrounding the end portion of the EGR tube. ### Claim 20 An engine assembly comprising: an engine structure defining a combustion chamber; an intake system including an intake manifold in communication with the combustion chamber and a throttle valve adapted to control air flow to the intake manifold; an exhaust system including an exhaust conduit in communication with the combustion chamber; and an exhaust gas recirculation system including an EGR tube in communication with the intake and exhaust systems, the EGR tube including an end portion extending a distance into the intake system at a location between the throttle valve and the intake manifold, the end portion extending in a direction opposing air flow to the intake manifold and parallel to the air flow, the end portion defining a closed longitudinal end having a rounded profile proximate to the throttle valve with at least one opening extending through a side wall of the end portion of the EGR tube, the longitudinal end of the EGR tube being spaced a distance from a pivot region of the throttle valve and the at least one opening being spaced a distance from the pivot region of the throttle valve, the at least one opening having an effective diameter at least equal to the effective diameter of the end portion the EGR tube to produce no significant pressure loss as a result of exhaust gas flow through the at least one opening and the intake system defining a concentric flow path surrounding the end portion of the EGR tube.