Twin scroll turbocharger in a variable displacement engine

Patent metadata

Field	Value
Publication number	US-2016333774-A1
Application number	US-201615218879-A
Country	US
Kind code	A1
Filing date	Jul 25, 2016
Priority date	Jul 29, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

Methods and systems are provided for operating an engine with variable displacement engine (VDE) operation coupled to a twin scroll turbocharger. One method comprises directing exhaust from a first outer cylinder and a first inner cylinder of four cylinders to a first scroll of the twin scroll turbocharger, directing exhaust from a second outer cylinder and a second inner cylinder of the four cylinders to a second scroll of the twin scroll turbocharger, and during a first condition, firing all four cylinders with uneven firing.

First claim

1 . A method for an engine having VDE operation comprising:
when all cylinders are activated, firing a first cylinder at 120 degrees of crank rotation, firing a second cylinder at 240 degrees of crank rotation after firing the first cylinder, firing a third cylinder at 240 degrees of crank rotation after firing the second cylinder, firing a fourth cylinder at 120 degrees of crank rotation after firing the third cylinder.

2 . The method of claim 1 , wherein when three cylinders are activated, firing the three activated cylinders at 240 crank angle degree intervals.

3 . The method of claim 2 , wherein the three cylinders are activated during idle engine conditions.

4 . The method of claim 2 , wherein the three cylinders are activated during medium engine load conditions.

5 . The method of claim 1 , further comprising when two cylinders are activated, firing the two activated cylinders at 360 crank angle degree intervals.

6 . The method of claim 5 , wherein the two cylinders are activated during low engine load conditions.

7 . A system for an engine, comprising:
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 and a second scroll; an inline group of four cylinders with a first cylinder fluidically communicating with the first scroll of the exhaust turbine and remaining three cylinders fluidically communicating with the second scroll of the exhaust turbine; and a controller configured with computer readable instructions stored on non-transitory memory for during a first condition, flowing exhaust from the first cylinder to the first scroll of the exhaust turbine and flowing exhaust from the remaining three cylinders to the second scroll of the exhaust turbine.

8 . The system of claim 7 , wherein the first condition includes high engine load conditions.

9 . The system of claim 8 , wherein the first scroll of the exhaust turbine receives exhaust from the first cylinder at 720 crank angle degree intervals.

10 . The system of claim 9 , wherein the second scroll of the exhaust turbine receives exhaust from the remaining three cylinders at 240 crank angle degree intervals.

11 . The system of claim 10 , wherein the exhaust from the first cylinder is received by the exhaust turbine midway between exhaust received from two of the remaining three cylinders.

12 . The system of claim 11 , wherein the controller further includes instructions for during a second condition, deactivating the flowing of exhaust from the first cylinder to the first scroll of the exhaust turbine and flowing exhaust from the remaining three cylinders to the second scroll of the exhaust turbine.

13 . The system of claim 12 , wherein the second condition includes medium engine load conditions.

14 . The system of claim 12 , wherein the second condition includes engine idling conditions.

15 . The system of claim 12 , wherein the controller further includes instructions for during a third condition, activating the first cylinder, activating a first of the remaining three cylinders, and, deactivating a second and a third cylinder of the remaining three cylinders.

16 . The system of claim 15 , wherein the exhaust system is shaped so exhaust flows from the first of the remaining three cylinders to the second scroll and exhaust flows from the first cylinder to the first scroll of the exhaust turbine.

17 . The system of claim 16 , wherein the engine crankshaft is configured for the exhaust turbine to receive exhaust at 360 crank angle degree intervals.

18 . The system of claim 17 , wherein the third condition includes low engine load conditions.

Assignees

• Ford Global Tech Llc

Inventors

• Boyer Brad Alan
• Mcconville Gregory Patrick
• Ku Kim Hwe
• Ervin James Douglas

Classifications

• F02D17/02

  Cutting-out (cutting-out engines in multiple engine arrangements F02D25/04) · CPC title

• F02M26/04

  with a single turbocharger · CPC title

• F02B37/025 Primary

  Multiple scrolls or multiple gas passages guiding the gas to the pump drive · CPC title

• F01N13/107

  More than one exhaust manifold or exhaust collector · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title