# US 2014/0360181 A1 · Method and system for binary flow turbine control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0360181 A1 - Document ID: US20140360181A1 - Status: Published application - Kind: A1 - Application number: 14/053,536 - Filed: 2013-10-14 - Published: 2014-12-11 - Earliest claimed: 2013-06-10 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Julia Helen Buckland; Jeffrey Allen Doering; Brad Alan Boyer - Web page: https://patentgrep.com/patent/US20140360181A1 ## CPC - F02B 37/183: {Arrangements of bypass valves or actuators therefor} - F02B 37/02: Gas passages between engine outlet and pump drive, e.g. reservoirs - F02B 37/025: {Multiple scrolls or multiple gas passages guiding the gas to the pump drive} - F02B 37/12: Control of the pumps - F02B 37/18: by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} - F02B 37/22: by varying cross-section of exhaust passages or air passages {, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits} (F02B37/24 takes precedence) - F02D 13/02: during engine operation - F02D 13/0215: {changing the valve timing only} - F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)} - F02D 41/005: {according to engine operating conditions} - F02D 41/0052: {Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount} - F02D 41/022: {in relation with the clutch status} - F02D 41/023: {in relation with the gear ratio shifting (conjoint control for improving gear change B60W30/19)} - F02D 41/04: Introducing corrections for particular operating conditions (F02D41/14 takes precedence) - F02D 41/062: {for starting (F02D41/061 takes precedence)} - F02M 26/01: Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages - 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 - F02P 5/04: automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions (dependent on position of personal controls of engine F02P5/02) - F02P 5/045: {combined with electronic control of other engine functions, e.g. fuel injection (in general F02D37/02)} - F02D 2041/001: {for engines with variable valve actuation} - F02D 2200/0404: Throttle position - F02D 2200/1002: Output torque - Y02T 10/12: Improving ICE efficiencies - Y02T 10/40: Engine management systems - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - 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) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Methods and systems are provided for adjusting the opening of a scroll valve of a binary flow turbine. Scroll valve adjustments are used at different engine operating conditions to improve engine performance and boost response. Scroll valve adjustments are coordinated with wastegate and EGR valve adjustments for improved engine control. ## Claims ### Claim 1 A method for an engine, comprising: adjusting a scroll valve coupled to an inlet of an outer scroll of a multi-scroll exhaust turbine responsive to engine dilution. ### Claim 2 (depends on 1) The method of claim 1, wherein adjusting the scroll valve responsive to engine dilution includes adjusting the scroll valve responsive to an EGR request, the EGR request including one or more of a low-pressure EGR request and a high-pressure EGR request, wherein the EGR system includes one or more of a low-pressure EGR system including a first EGR valve and a high-pressure EGR system including a second EGR valve, and wherein one or more of the first EGR valve and the second EGR valve is adjusted based on the engine dilution request and the scroll valve adjustment. ### Claim 3 (depends on 1) The method of claim 1, wherein the engine includes an EGR system configured to recirculate exhaust gas from an engine exhaust to an engine intake, and wherein the adjusting includes, in response to an engine dilution request being higher than an engine dilution that can be provided by the EGR system, decreasing an opening of the scroll valve, and in response to the engine dilution request being lower than the engine dilution that can be provided by the EGR system, increasing the opening of the scroll valve. ### Claim 4 (depends on 1) The method of claim 1, wherein the engine includes an EGR system, and wherein the adjusting responsive to engine dilution includes, increasing engine dilution by increasing opening of a valve coupled to the EGR system while decreasing an opening of the scroll valve, the decreasing based on each of an engine dilution request and an opening limit of the EGR valve. ### Claim 5 (depends on 4) The method of claim 4, wherein the adjusting responsive to engine dilution further includes, decreasing engine dilution by decreasing opening of the valve coupled to the EGR system while increasing the opening of the scroll valve, the increasing based on each of the engine dilution request and a closing limit of the EGR valve. ### Claim 6 (depends on 5) The method of claim 5, further comprising, maintaining cylinder valve timing during the increasing and decreasing opening of the scroll valve. ### Claim 7 (depends on 1) The method of claim 1, further comprising, adjusting a wastegate coupled across the exhaust turbine responsive to the engine dilution, the wastegate adjusted based on the scroll valve adjustment and the engine dilution. ### Claim 8 (depends on 1) The method of claim 1, further comprising, adjusting one or more of spark ignition timing, VCT, and intake throttle position based on the scroll valve adjustment and the engine dilution. ### Claim 9 (depends on 1) The method of claim 1, wherein responsive to engine dilution includes responsive to an engine dilution request relative to an engine combustion stability limit, the scroll valve to a more closed position as a request for engine dilution increases, the scroll valve moved to a more open position as a request for engine dilution decreases. ### Claim 10 (depends on 1) The method of claim 1, wherein the outer scroll is a first scroll, the multi-scroll exhaust turbine further including a second, inner scroll, and wherein the scroll valve is not coupled to the inner scroll. ### Claim 11 (depends on 2) The method of claim 2, wherein in response to the engine dilution request including a request for high-pressure EGR, closing the scroll valve to raise exhaust manifold pressure above intake manifold pressure. ### Claim 12 A method for an engine, comprising: recirculating residuals from an engine exhaust to an engine intake via an EGR system until a combustion stability limit is reached; and after the combustion stability limit is reached, reducing internal residuals by moving a scroll valve coupled to an outer scroll of a multi scroll turbine to a more open position. ### Claim 13 (depends on 12) The method of claim 12, wherein recirculating via an EGR system includes recirculating via a low-pressure EGR system coupled between the engine exhaust, downstream of the turbine, to the engine intake, upstream of an intake compressor, by opening a first EGR valve and/or recirculating via a high-pressure EGR system coupled between the engine exhaust, upstream of the turbine, to the engine intake, downstream of the intake compressor, by opening a second EGR valve. ### Claim 14 (depends on 13) The method of claim 13, further comprising, while moving the scroll valve to the more open position, reducing an opening of the first and/or second EGR valve. ### Claim 15 (depends on 12) The method of claim 12, further comprising, adjusting one or more of a wastegate coupled to the exhaust turbine, spark ignition timing, VCT, positive valve overlap, and intake throttle opening while moving the scroll valve to the more closed position, the adjusting based on each of the scroll valve position and engine dilution. ### Claim 16 An engine system, comprising: an engine; a turbocharger for providing a boosted aircharge to the engine, the turbocharger including an intake compressor and an exhaust turbine, the exhaust turbine including a first outer and a second inner scroll; a scroll valve coupled to an inlet of the first outer scroll; a wastegate included in a bypass coupled between an inlet and an outlet of the turbine; a first EGR passage coupled between an engine exhaust, downstream of the turbine, and an engine intake, upstream of the compressor, the first EGR passage including a first EGR valve; a second EGR passage coupled between the engine exhaust, upstream of the turbine, and the engine intake, downstream of the compressor, the second EGR passage including a second EGR valve; and a controller with computer readable instructions for, opening one or more of the first EGR valve and the second EGR valve to provide engine dilution; and upon reaching a limit, providing further engine dilution by decreasing an opening of the scroll valve. ### Claim 17 (depends on 16) The system of claim 16, wherein the limit includes one of an opening limit of the first EGR valve, an opening limit of the second EGR valve, and a combustion stability of the engine. ### Claim 18 (depends on 16) The system of claim 16, wherein the controller is configured to maintain the first and/or second EGR valve open while decreasing the opening of the scroll valve. ### Claim 19 (depends on 16) The system of claim 16, wherein the controller is configured to decrease the opening of the first and/or second EGR valve while decreasing the opening of the scroll valve. ### Claim 20 (depends on 16) The system of claim 16, wherein the controller is configured to adjust the opening of each of the first and second EGR valve while decreasing the opening of the scroll valve to vary a ratio of high-pressure EGR to low-pressure EGR delivered to the engine.