Exhaust-gas-turbocharged applied-ignition internal combustion engine having at least two turbines, and method for operating an internal combustion engine of said type

Patent metadata

Field	Value
Publication number	US-9874161-B2
Application number	US-201514692103-A
Country	US
Kind code	B2
Filing date	Apr 21, 2015
Priority date	May 9, 2014
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A method for operating a boosted internal combustion engine is provided. The engine includes a first cylinder in a first cylinder group and a second cylinder in a second cylinder group, each of the first and second cylinders having two activatable outlet openings adjoined by an exhaust line, one of the outlet openings of each of the first and second cylinders coupled to a first turbocharger including a first turbine and one of the outlet openings of each of the cylinders coupled to a second turbocharger including a second turbine, the method comprising: if engine load is less than a threshold load value implementing a first operating mode that includes deactivating the second cylinder, deactivating one of the activatable outlet openings in the first cylinder, and activating one of the activatable outlet opening in the first cylinder.

First claim

The invention claimed is:

1. A method for operating a boosted applied-ignition internal combustion engine including at least one cylinder in a first cylinder group and at least one cylinder in a second cylinder group, each of the cylinders in the first and second cylinder groups having two activatable outlet openings adjoined by an exhaust line, one of the activatable outlet openings of each of the first and second cylinders coupled to a first turbocharger including a first turbine and one of the activatable outlet openings of each of the cylinders coupled to a second turbocharger including a second turbine, the method comprising:
in a first operating mode, when the boosted applied-ignition internal combustion engine is operating below a predetermined threshold load and when engine speed is above or below a predetermined engine speed,
deactivating the second cylinder group by deactivation of the activatable outlet openings in the at least one cylinder in the second cylinder group; and
supplying the first and second turbines with exhaust gas from the first cylinder group via actuation of the two activatable outlet openings in the at least one cylinder in the first cylinder group;

in a second operating mode, when engine load exceeds the predetermined threshold load and when engine speed is lower than the predetermined engine speed,
deactivating the activatable outlet opening in the at least one cylinder in the first cylinder group and coupled to the first turbine;
activating the activatable outlet opening in the at least one cylinder of the second cylinder group and coupled to the second turbine; and
flowing exhaust gas to the second turbine from the first and second cylinder groups; and

in a third operating mode, when the engine load exceeds the predetermined threshold load and when engine speed is higher than the predetermined engine speed,
activating the activatable outlet openings in the at least one cylinder in the second cylinder group and coupled to the first turbine; and
flowing exhaust gas to the first and second turbines from the first and second cylinder groups.

2. The method of claim 1 , when transferring the engine into the second operating mode proceeding from the third operating mode, the second operating mode includes:
deactivating the activatable outlet opening of the first cylinder of the first cylinder group coupled to the first turbine; and
deactivating the activatable outlet opening of the second cylinder of the second cylinder group coupled to the first turbine.

3. A method for operating a boosted engine including a first cylinder in a first cylinder group and a second cylinder in a second cylinder group, each of the first and second cylinders having two activatable outlet openings adjoined by an exhaust line, one of the outlet openings of each of the first and second cylinders coupled to a first turbocharger including a first turbine and one of the outlet openings of each of the first and second cylinders coupled to a second turbocharger including a second turbine, comprising:
in response to engine load dropping below a threshold load value when engine speed is above or below a predetermined engine speed, implementing a first operating mode that includes,
deactivating the second cylinder; and
activating the two activatable outlet openings in the first cylinder; and

in response to engine load exceeding the threshold load value and when the engine speed is lower than the predetermined engine speed, implementing a second operating mode that includes,
sustaining activation of the activatable outlet opening in the first cylinder coupled to the second turbine;
activating the activatable outlet openings in the second cylinder coupled to the second turbine;
deactivating the activatable outlet opening in the first cylinder coupled to the first turbine; and
sustaining deactivation of the activatable outlet opening in the second cylinder coupled to the first turbine.

4. The method of claim 3 , further comprising, if the engine load is greater than the threshold load value and the engine speed greater than the predetermined engine speed, implementing a third operating mode that includes,
sustaining activation of the activatable outlet opening in the first cylinder and coupled to the second turbine;
sustaining activation of the activatable outlet opening in the second cylinder and coupled to the second turbine;
activating the deactivated activatable outlet opening in the second cylinder and coupled to the first turbine; and
activating the deactivated activatable outlet opening in the first cylinder and coupled to first turbine.

5. The method of claim 3 , further comprising, in the first operating mode, flowing exhaust gas from the activatable outlet openings in the first cylinder to each of the first turbine and the second turbine.

6. The method of claim 3 , where the first turbine includes a wastegate valve and the method includes operating the wastegate valve based on engine speed in the first operating mode.

Assignees

• Ford Global Tech Llc

Inventors

• Sommerhoff Franz Arnd
• Kraemer Frank
• Brinkmann Franz J
• Kindl Helmut Matthias
• Smiljanovski Vanco
• Kemmerling Joerg
• Willems Werner
• Weber Carsten

Classifications

• F01N13/107

  More than one exhaust manifold or exhaust collector · CPC title

• F02B37/002

  the exhaust supply to one of the exhaust drives can be interrupted · CPC title

• F02M25/0711

  Mechanical Engineering · mapped topic

• F02B37/001

  using exhaust drives arranged in parallel · CPC title

• F01N13/105

  having the form of a chamber directly connected to the cylinder head, e.g. without having tubes connected between cylinder head and chamber · CPC title