# US 2014/0360179 A1 · Method and system for binary flow turbine control

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- Number: US 2014/0360179 A1
- Document ID: US20140360179A1
- Status: Published application
- Kind: A1
- Application number: 14/053,521
- 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; Amey Y. Karnik; Julia Helen Buckland; Brad Alan Boyer; Stephen Lee Cooper
- Web page: https://patentgrep.com/patent/US20140360179A1

## 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:
transitioning a restriction in exhaust upstream of a first scroll of a multi-scroll exhaust turbine based on operating conditions while adjusting an engine actuator during the transition to maintain engine torque.

### Claim 2 (depends on 1)

The method of claim 1, wherein the engine includes a second scroll inner to the first scroll, and a scroll valve coupled to only the first scroll, and wherein the transitioning restriction in exhaust includes transitioning an opening of the scroll valve.

### Claim 3 (depends on 2)

The method of claim 2, wherein the transitioning restriction in exhaust includes, at lower turbine speeds, closing the scroll valve to increase restriction, and at higher turbine speeds, opening the scroll valve to decrease restriction.

### Claim 4 (depends on 3)

The method of claim 3, wherein adjusting an engine actuator includes adjusting one or more of VCT, EGR, valve timing, intake throttle position, wastegate, and transmission shift schedule.

### Claim 5 (depends on 4)

The method of claim 4, wherein the adjusting includes, when closing the scroll valve to increase restriction, adjusting the engine actuator to transiently increase engine air flow, and when opening the scroll valve to decrease restriction, adjusting the engine actuator to transiently decrease engine air flow.

### Claim 6 (depends on 4)

The method of claim 4, wherein the adjusting includes, when closing the scroll valve to increase restriction, adjusting the engine actuator to decrease engine dilution, and when opening the scroll valve to decrease restriction, adjusting the engine actuator to increase engine dilution.

### Claim 7 (depends on 1)

The method of claim 1, wherein the engine actuator adjustment is based on the transitioning of the scroll valve opening.

### Claim 8 (depends on 7)

The method of claim 7, wherein the engine actuator adjustment is increased as the transitioning of the scroll valve opening increases.

### Claim 9 (depends on 1)

The method of claim 1, wherein a timing of the transitioning is based on a transmission event.

### Claim 10

A method for an engine, comprising:
transitioning restriction in exhaust upstream of a first scroll of a multi-scroll exhaust turbine based on operating conditions; and
adjusting a timing of the transitioning based on a transmission event.

### Claim 11 (depends on 10)

The method of claim 10, wherein the transmission event includes an upcoming transmission upshift event or an upcoming transmission downshift event.

### Claim 12 (depends on 11)

The method of claim 11, wherein the adjusting includes, in response to an upcoming transmission event, timing the transitioning to at least partially overlap the transmission event.

### Claim 13 (depends on 11)

The method of claim 11, wherein the adjusting includes, in response to an upcoming transmission event, timing the transitioning to immediately follow the transmission event.

### Claim 14 (depends on 11)

The method of claim 11, if a duration between the transmission event and a request for transitioning restriction is smaller than a threshold, timing the transitioning during the transmission event, and if the duration between the transmission event and the request for transitioning restriction is larger than the threshold, timing the transitioning before the transmission event.

### Claim 15 (depends on 14)

The method of claim 14, further comprising, when timing the transitioning during the transmission event, increasing clutch slippage and/or adjusting spark retard during the transitioning, the increasing based on the transitioning.

### Claim 16 (depends on 14)

The method of claim 14, wherein the engine includes a scroll valve coupled to the first scroll and further includes a second scroll positioned inner to the first scroll, the scroll valve not coupled to the second scroll, and wherein the transitioning restriction in exhaust includes transitioning an opening of the scroll valve.

### Claim 17

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 between an engine exhaust manifold an inlet of the first outer scroll;
a transmission including a clutch;
and
a controller with computer readable instructions for,
transitioning an opening of the scroll valve responsive to engine operating conditions;
timing the transitioning based on a shift schedule of the transmission;
and
adjusting slippage of the clutch during the transitioning.

### Claim 18 (depends on 17)

The system of claim 17, wherein timing the transitioning includes timing the transitioning to at least partially overlap with the shift schedule of the transmission.

### Claim 19 (depends on 17)

The system of claim 17, wherein an amount of clutch slippage is based on the transitioning of the scroll valve, the amount of clutch slippage increased as the transitioning of the scroll valve increases.

### Claim 20 (depends on 17)

The system of claim 17, wherein the controller includes further instructions for, retarding spark ignition timing in response to reducing scroll valve restriction and advancing spark ignition timing in response to increasing scroll valve restriction, an amount of spark timing adjustment applied increased as the transitioning of the scroll valve increases.

### Claim 21 (depends on 17)

The system of claim 17, wherein an amount of clutch slippage is based on the transitioning of the scroll valve, the amount of clutch slippage increased before and during the scroll valve transition.

### Claim 22 (depends on 17)

The system of claim 17, wherein the controller includes further instructions for, retarding spark ignition timing during the transitioning, an amount of spark retard applied increased as the transitioning of the scroll valve increases.