# US 2020/0400085 A1 · High pressure loop exhaust gas recirculation and twin scroll turbocharger flow control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0400085 A1 - Document ID: US20200400085A1 - Status: Published application - Kind: A1 - Application number: 16/444,425 - Filed: 2019-06-18 - Published: 2020-12-24 - Earliest claimed: 2019-06-18 - Assignees: Fca US LLC - Inventors: Michael S McMeekin - Web page: https://patentgrep.com/patent/US20200400085A1 ## CPC - F02D 41/0077: {Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position (EGR valve position sensor F02M26/48)} - F02B 37/025: {Multiple scrolls or multiple gas passages guiding the gas to the pump drive} - F02B 37/183: {Arrangements of bypass valves or actuators therefor} - F02D 13/0242: {Variable control of the exhaust valves only} - F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)} - F02D 41/0065: {Specific aspects of external EGR control (constructional details of EGR system F02M26/00)} - 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 26/09: Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine - F02M 26/16: with EGR valves located at or near the connection to the exhaust system - 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 26/51: EGR valves combined with other devices, e.g. with intake valves or compressors (combined with intake air throttles F02M26/64) - F02M 26/66: Lift valves, e.g. poppet valves - F02M 26/68: Closing members; Valve seats; Flow passages - F02D 2041/001: {for engines with variable valve actuation} - F02F 1/243: {Cylinder heads and inlet or exhaust manifolds integrally cast together} - F02M 26/23: Layout, e.g. schematics - F02M 26/34: with compressors, turbines or the like in the recirculation passage - Y02T 10/12: Improving ICE efficiencies - Y02T 10/40: Engine management systems - 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) - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An exhaust flow control system comprises a housing defining first and second passages that are fluidly connected to first and second scrolls of a twin scroll turbocharger and to a high pressure exhaust gas recirculation (HPEGR) system, a poppet valve configured to (i) in an open position, fluidly connect the first and second scrolls to each other and to the HPEGR system via the first and second passages and (ii) in a closed position, fluidly disconnect the first and second scrolls from each other and from the HPEGR system, and a controller configured to command the poppet valve to one of the open and closed positions based on one or more engine operating parameters thereby allowing the twin scroll turbocharger to operate in both a twin scroll mode and a mono scroll mode while also allowing for HPEGR control with minimal additional system volume. ## Claims ### Claim 1 An exhaust flow control system for an engine of a vehicle, the engine having a twin scroll turbocharger and a high pressure exhaust gas recirculation (HPEGR) system, the exhaust flow control system comprising: a housing defining first and second passages that are fluidly connected to first and second scrolls of the twin scroll turbocharger and to the HPEGR system; and a flow control system comprising: a poppet valve configured to (i) in an open position, fluidly connect the first and second scrolls to each other and to the HPEGR system via the first and second passages and (ii) in a closed position, fluidly disconnect the first and second scrolls from each other and from the HPEGR system; and a controller configured to command the poppet valve to one of the open and closed positions based on one or more operating parameters of the engine, thereby allowing the twin scroll turbocharger to operate in both a twin scroll mode and a mono scroll mode depending on the one or more engine operating parameters while also allowing for HPEGR control with minimal additional system volume. ### Claim 2 (depends on 1) The exhaust flow control system of claim 1, wherein the housing is a housing of the twin scroll turbocharger. ### Claim 3 (depends on 1) The exhaust flow control system of claim 1, wherein the housing is a housing of an integrated exhaust manifold at least partially integrated into a cylinder head of the engine, wherein the first and second passages are also fluidly connected to first and second sets of cylinders of the engine, respectively. ### Claim 4 (depends on 3) The exhaust flow control system of claim 3, wherein the engine is an in-line four cylinder engine and the first set of cylinders comprises a first cylinder and a fourth cylinder and the second set of cylinders comprises a second cylinder and a third cylinder. ### Claim 5 (depends on 3) The exhaust flow control system of claim 3, further comprising a cooling system configured to cool the integrated exhaust manifold, the exhaust gas therein, and the poppet valve. ### Claim 6 (depends on 5) The exhaust flow control system of claim 5, wherein the cooling system is a water jacket. ### Claim 7 (depends on 1) The exhaust flow control system of claim 1, wherein the controller is configured to command the poppet valve to the open position when at least one of engine speed and engine load exceeds a respective threshold. ### Claim 8 (depends on 7) The exhaust flow control system of claim 7, wherein the controller is configured to command the poppet valve to the closed position when engine speed is less than a threshold. ### Claim 9 (depends on 8) The exhaust flow control system of claim 8, wherein the controller is configured to command the poppet valve to the open and closed positions to (i) decrease pumping mean effective pressure (PMEP) of the engine, (ii) decrease thermal enrichment of the exhaust gas produced by the engine, and (iii) decrease brake-specific fuel consumption (BSFC) of the engine. ### Claim 10 (depends on 1) The exhaust flow control system of claim 1, wherein the poppet valve comprises a plunger or mushroom valve member that is moved between the open and closed positions by an actuator that is electronically controlled by the controller. ### Claim 11 (depends on 1) The exhaust flow control system of claim 1, wherein the HPEGR system further comprises an HPEGR butterfly valve that is controlled by the controller to regulate flow through the HPEGR system. ### Claim 12 (depends on 1) The exhaust flow control system of claim 1, wherein the open and closed positions are fully-open and fully-closed positions, respectively, and wherein the poppet valve is configured to operate in only one of these two positions. ### Claim 13 (depends on 1) The exhaust flow control system of claim 1, wherein the engine is a four cylinder engine having a first two cylinders fluidly connected to the first scroll and a second two cylinders fluidly connected to the second scroll.