# US 2014/0360182 A1 · Method and system for binary flow turbine control

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- Number: US 2014/0360182 A1
- Document ID: US20140360182A1
- Status: Published application
- Kind: A1
- Application number: 14/053,540
- Filed: 2013-10-14
- Published: 2014-12-11
- Earliest claimed: 2013-06-10
- Assignees: Ford Global Technologies, LLC
- Applicants: Ford Global Technologies, LLC
- Inventors: Brad Alan Boyer; Julia Helen Buckland; Stephen Lee Cooper; Jeffrey Allen Doering; Barbara Westrate; Keith Michael Plagens
- Web page: https://patentgrep.com/patent/US20140360182A1

## 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:
in response to a cold-start condition, adjusting a scroll valve coupled to an inlet of one scroll of a multi-scroll exhaust turbine to expedite catalyst warm-up.

### Claim 2 (depends on 1)

The method of claim 1, wherein the one scroll is a first, outer scroll, the turbine further including a second, inner scroll, and wherein adjusting the scroll valve includes moving the scroll valve to a more closed position.

### Claim 3 (depends on 1)

The method of claim 1, further comprising, maintaining the scroll valve in the more closed position for a threshold number of combustion events since the engine cold-start, and after the threshold number of combustion events, moving the scroll valve to a more open position.

### Claim 4 (depends on 2)

The method of claim 2, wherein the scroll valve is not coupled to an inlet of the second, inner scroll.

### Claim 5 (depends on 2)

The method of claim 2, wherein the adjusting the scroll valve is based on exhaust temperature, the adjusting including, when the exhaust temperature at the cold-start is below a threshold, moving the valve to a more closed position, and moving the valve to a more open position as the exhaust temperature moves above the threshold.

### Claim 6 (depends on 5)

The method of claim 5, further comprising, adjusting a turbine wastegate position based on the scroll valve position.

### Claim 7 (depends on 6)

The method of claim 6, wherein the adjusting includes, as the scroll valve is moved to a more closed position, moving the wastegate to a more closed position.

### Claim 8 (depends on 7)

The method of claim 7, wherein the wastegate position is further adjusted based on the exhaust temperature at the cold-start.

### Claim 9 (depends on 8)

The method of claim 8, wherein the adjusting includes, moving the wastegate to a more open position as the exhaust temperature moves above the threshold.

### Claim 10 (depends on 1)

The method of claim 1, further comprising, adjusting one or more of spark ignition timing, VCT, EGR and throttle position while moving the scroll valve based on the scroll valve position.

### Claim 11 (depends on 1)

The method of claim 1, wherein when the cold-start condition includes an exhaust catalyst temperature being less than a threshold temperature and a turbine speed being below a threshold speed, adjusting the scroll valve includes moving the scroll valve to a more closed position; and when the cold-start condition includes the exhaust catalyst temperature being less than the threshold temperature and the turbine speed being above the threshold speed, adjusting the scroll valve includes moving the scroll valve to a more open position.

### Claim 12

A method for a boosted engine, comprising:
during an engine cold-start condition, starting the engine with a scroll valve coupled to an outer scroll of an exhaust turbine less open for a first, larger number of combustion events; and
during an engine hot-start condition, starting the engine with the scroll valve more open for a second, smaller number of combustion events.

### Claim 13 (depends on 12)

The method of claim 12, wherein the engine cold-start condition includes an exhaust catalyst temperature being lower than a threshold temperature, and wherein the engine hot-start condition includes the exhaust catalyst temperature being higher than the threshold temperature.

### Claim 14 (depends on 13)

The method of claim 13, further comprising, during the cold-start condition, adjusting an opening of the scroll valve based on the exhaust catalyst temperature.

### Claim 15 (depends on 14)

The method of claim 14, wherein the adjusting includes, for the first number of combustion events, as the exhaust catalyst temperature increases, increasing an opening of the scroll valve, and after the first number of combustion events, moving the scroll valve to a fully closed position.

### Claim 16 (depends on 12)

The method of claim 12, wherein each of the first number and second number of combustion events are based on an exhaust temperature at engine start.

### Claim 17 (depends on 12)

The method of claim 12, further comprising, during the engine cold-start condition, starting the engine with a wastegate coupled to the exhaust turbine less open for the first, number of combustion events; and during the engine hot-start condition, starting the engine with the wastegate more open for a second number of combustion events, wherein during each of the cold-start and hot-start condition, the opening of the wastegate is based on the opening of the scroll valve.

### Claim 18

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 wastegate included in a bypass coupled between an inlet and an outlet of the turbine;
and
a controller with computer readable instructions for,
during an engine cold-start condition, starting the engine with an opening of the scroll valve adjusted responsive to exhaust temperature for a number of cylinder events since a first combustion event.

### Claim 19 (depends on 18)

The system of claim 18, wherein the adjusting includes, starting the engine scroll valve more closed, and increasing an opening of the scroll valve as the exhaust temperature rises.

### Claim 20 (depends on 19)

The system of claim 19, wherein the controller includes further instructions for, adjusting the wastegate while adjusting the scroll valve during the cold-start, the wastegate adjustment based on the scroll valve adjustment to expedite exhaust catalyst heating.