# US 10,871,104 B2 · Systems and methods for a split exhaust engine system

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- Number: US 10,871,104 B2
- Document ID: US10871104B2
- Status: Granted
- Kind: B2
- Application number: 15/666,963
- Filed: 2017-08-02
- Published: 2019-02-07
- Granted: 2020-12-22
- Earliest claimed: 2017-08-02
- Assignees: Ford Global Technologies, LLC
- Applicants: Ford Global Technologies, LLC
- Inventors: Joseph Norman Ulrey; Daniel Paul Madison; Brad Alan Boyer
- Web page: https://patentgrep.com/patent/US10871104B2

## CPC

- F02B 37/183: {Arrangements of bypass valves or actuators therefor}
- F01N 3/10: by thermal or catalytic conversion of noxious components of exhaust
- F01N 13/009: {having two or more separate purifying devices arranged in series}
- F01N 13/107: {More than one exhaust manifold or exhaust collector}
- F02B 25/145: {with intake and exhaust valves exclusively in the cylinder head}
- F02B 37/025: {Multiple scrolls or multiple gas passages guiding the gas to the pump drive}
- F02D 13/0257: {Independent control of two or more intake or exhaust valves respectively, i.e. one of two intake valves remains closed or is opened partially while the other is fully opened}
- F02D 13/0261: {Controlling the valve overlap}
- 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 26/07: 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
- F02M 26/15: in relation to engine exhaust purifying apparatus
- F02M 26/41: characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
- F02M 26/42: having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
- F02M 26/44: in which a main EGR passage is branched into multiple passages
- F01N 2410/00: By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
- F02D 41/0055: {Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus}
- F02M 26/43: in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine
- 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)
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Methods and systems are provided for operating a split exhaust engine system that provides blowthrough air and exhaust gas recirculation (EGR) to an intake passage via a ported scavenge manifold. In one example, the ported scavenge manifold includes a first scavenge manifold coupled to a plurality of exhaust runners and a second scavenge manifold coupled to the plurality of exhaust runners via ports. The location of the ports on the exhaust runners combined with adjustments to a bypass valve coupled between the first scavenge manifold and an exhaust passage and an EGR valve coupled between the second scavenge manifold and the intake passage enables exhaust gas to be preferentially flowed to the exhaust passage and blowthrough air to be preferentially flowed to the intake passage under select operating conditions.

## Claims

### Claim 1

A system for an engine, comprising:
a plurality of cylinders, each of the plurality of cylinders including a first exhaust valve fluidly coupled to an exhaust passage, upstream of a turbocharger turbine, and a second exhaust valve fluidly coupled to each of:
a first scavenge manifold via an exhaust runner, the first scavenge manifold coupled to the exhaust passage, downstream of the turbocharger turbine; and
a second scavenge manifold via a port, where a first end of the port is directly coupled to the exhaust runner, proximate to the second exhaust valve, and a second end of the port is directly coupled to the second scavenge manifold, the second scavenge manifold coupled to an intake passage, upstream of a turbocharger compressor.

### Claim 2 (depends on 1)

The system of claim 1, wherein the first scavenge manifold is coupled to the exhaust passage, downstream of the turbocharger turbine and a first catalyst.

### Claim 3 (depends on 2)

The system of claim 2, wherein the first scavenge manifold is coupled to the exhaust passage via a bypass passage including a bypass valve adapted to restrict flow to the exhaust passage.

### Claim 4 (depends on 3)

The system of claim 3, wherein the bypass passage is coupled to the exhaust passage between the first catalyst and a second catalyst, the second catalyst positioned downstream of the turbocharger turbine.

### Claim 5 (depends on 1)

The system of claim 1, wherein the second scavenge manifold is coupled to the intake passage, upstream of the turbocharger compressor, via an exhaust gas recirculation passage coupled between the second scavenge manifold and the intake passage, the exhaust gas recirculation passage including a valve adapted to restrict flow to an inlet of the turbocharger compressor.

### Claim 6 (depends on 1)

The system of claim 1, wherein the second end of the port of each of the plurality of cylinders is spaced away from second ends of adjacent ports along a length of the second scavenge manifold.

### Claim 7 (depends on 1)

The system of claim 1, wherein the first end of the port is positioned closer to the second exhaust valve than where the exhaust runner couples to the first scavenge manifold.

### Claim 8 (depends on 1)

The system of claim 1, wherein a diameter of the port is smaller than a diameter of the exhaust runner.

### Claim 9

A system for an engine, comprising:
a plurality of cylinders, each cylinder including a first exhaust valve and a second exhaust valve;
a blowdown exhaust manifold coupled to the first exhaust valve of each cylinder, the blowdown exhaust manifold coupled to an exhaust passage, upstream of a turbocharger turbine;
a first scavenge exhaust manifold coupled to the second exhaust valve of each cylinder via an exhaust runner, the first scavenge exhaust manifold coupled to the exhaust passage, downstream of the turbocharger turbine and upstream of a catalyst;
a second scavenge exhaust manifold coupled to the second exhaust valve of each cylinder via a port coupled to the exhaust runner, the second scavenge exhaust manifold coupled to an intake passage, upstream of a turbocharger compressor;
a bypass passage coupling the first scavenge exhaust manifold to the exhaust passage, downstream of the turbocharger turbine and upstream of the catalyst, the bypass passage including a bypass valve disposed therein;
an exhaust gas recirculation (EGR) passage coupling the second scavenge exhaust manifold to the intake passage, upstream of the turbocharger compressor, the EGR passage including an EGR valve disposed therein; and
a controller with computer readable instructions stored on memory for:
operating the first exhaust valve of each cylinder at a different timing than the second exhaust valve of each cylinder; and
opening the bypass valve and maintaining the EGR valve open in response to the turbocharger compressor reaching an operational threshold.

### Claim 10 (depends on 9)

The system of claim 9, wherein the operational threshold includes one or more of an inlet temperature of the turbocharger compressor reaching or surpassing a threshold inlet temperature and a speed of the turbocharger compressor reaching or surpassing a threshold speed.