# US 2014/0360180 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 2014/0360180 A1 - Document ID: US20140360180A1 - Status: Published application - Kind: A1 - Application number: 14/053,525 - Filed: 2013-10-14 - Published: 2014-12-11 - Earliest claimed: 2013-06-10 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Jeffrey Allen Doering; Julia Helen Buckland; Brad Alan Boyer - Web page: https://patentgrep.com/patent/US20140360180A1 ## 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 one scroll of a multi-scroll exhaust turbine responsive to an indication of engine deactivation. ### Claim 2 (depends on 1) The method of claim 1, wherein the indication of engine deactivation includes a deceleration fuel shut-off. ### Claim 3 (depends on 1) The method of claim 1, wherein the one scroll is a first, outer scroll, the multi-scroll exhaust turbine including a second, inner scroll, the valve not coupled to an inlet of the second scroll. ### Claim 4 (depends on 1) The method of claim 1, wherein the adjusting includes, in response to the indication of engine deactivation, moving the scroll valve to a more closed position. ### Claim 5 (depends on 4) The method of claim 4, wherein moving the scroll valve to the more closed position includes moving the scroll valve to the more closed position based on one or more of turbine speed or boost pressure during the engine deactivation. ### Claim 6 (depends on 5) The method of claim 5, wherein the moving based on turbine speed includes moving the scroll valve based on a difference between an estimated or measured turbine speed during the engine deactivation relative to a turbine speed deceleration profile and/or the difference between measured and desired boost pressure, the scroll valve moved towards a fully closed position as the difference increases. ### Claim 7 (depends on 6) The method of claim 6, further comprising, moving a wastegate coupled across the exhaust turbine to a more closed position in response to the indication of engine deactivation, the wastegate position based on the scroll valve position. ### Claim 8 (depends on 7) The method of claim 7, wherein moving the wastegate includes, during a first condition where the wastegate and scroll valve have substantially similar authority, moving the wastegate to the more closed position as the scroll valve is moved to the more closed position; during a second condition where the scroll valve has higher authority, moving the wastegate to the more closed position after the scroll valve is moved to the more closed position; and during a third condition where the scroll valve has lower authority, moving the wastegate to the more closed position before the scroll valve is moved to the more closed position. ### Claim 9 (depends on 6) The method of claim 6, further comprising, adjusting one or more of VCT, valve overlap, EGR, and intake throttle position during the engine deactivation based on the moving of the scroll valve. ### Claim 10 (depends on 4) The method of claim 4, wherein a timing of moving the scroll valve to the more closed position is based on a transmission event. ### Claim 11 A method for a boosted engine, comprising: deactivating fuel injection to an engine; and while the engine spins towards rest, adjusting a scroll valve coupled to an outer scroll of a multi-scroll exhaust turbine based on deviation of estimated turbine speed relative to a turbine speed deceleration profile. ### Claim 12 (depends on 11) The method of claim 11, wherein deactivating fuel injection to the engine includes deactivating in response to a tip-out. ### Claim 13 (depends on 11) The method of claim 11, wherein the adjusting includes, as the deviation of the estimated or measured turbine speed from the turbine speed deceleration profile increases, moving the scroll valve towards a fully closed position. ### Claim 14 (depends on 11) The method of claim 11, wherein a timing of adjusting the scroll valve is based on a transmission event during the engine spin-down. ### Claim 15 (depends on 13) The method of claim 13, further comprising, moving a wastegate coupled across the exhaust turbine towards a more closed position while the engine spins towards rest, the position of the wastegate based on the scroll valve position. ### Claim 16 (depends on 15) The method of claim 15, further comprising, adjusting one or more of VCT, EGR, intake throttle position, and valve overlap while the engine spins towards rest, the adjusting based on the scroll valve adjustment. ### Claim 17 An engine system, comprising: an engine including selectively deactivatable fuel injectors; 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 scroll and a second inner scroll; a scroll valve coupled between an exhaust manifold of the engine and an inlet of the first outer scroll; a wastegate included in a bypass coupled between an inlet and an outlet of the exhaust turbine; and a controller with computer readable instructions for, in response to torque demand being lower than a threshold, selectively deactivating fuel injection to the engine; and while the engine spins down to rest, decreasing an opening of the scroll valve, the decreasing based on a difference between an estimated or measured turbine speed and a desired spin-down turbine speed profile during the spin-down. ### Claim 18 (depends on 17) The system of claim 17, wherein the controller includes further instructions for coordinating an opening of the wastegate during the engine spin-down based on the decreasing an opening of the scroll valve to further reduce the difference between the estimated or measured turbine speed and the desired spin-down turbine speed profile. ### Claim 19 (depends on 17) The system of claim 17, further comprising an EGR system configured to recirculate exhaust gas from the exhaust manifold to an intake manifold of the engine, wherein the controller includes further instructions for adjusting an EGR valve of the EGR system to decrease an amount of EGR during the decreasing of an opening of the scroll valve. ### Claim 20 (depends on 17) The system of claim 17, wherein the controller includes further instructions for, during a first engine restart from the spin-down, restarting the engine with the scroll valve closed; and during a second engine restart from the spin-down, restarting the engine with the scroll valve open, a duration of engine deactivation preceding the first engine restart longer than the duration of engine deactivation preceding the second engine restart.