Method and system for improving turbocharger efficiency

Patent metadata

Field	Value
Publication number	US-2016108798-A1
Application number	US-201414516324-A
Country	US
Kind code	A1
Filing date	Oct 16, 2014
Priority date	Oct 16, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

Methods and systems are provided for enhancing turbocharger performance for a boosted engine system configured to operate with a pattern of deactivated cylinders. In one example, a method may include, in response to a demand for boost, operating with a cylinder pattern based on boost demand and turbocharger configuration. The specific pattern may depend on the pattern constraints imposed by engine load and NVH metrics.

First claim

1 . A method for a boosted engine system, comprising:
in response to a boost demand,
selectively deactivating a cylinder pattern of individual cylinder valve mechanisms; the cylinder pattern selected to direct exhaust from active cylinders into one scroll of a multi-scroll exhaust turbine.

2 . The method of claim 1 , wherein the boost demand is below a threshold demand.

3 . The method of claim 1 , further comprising, in response to the boost demand being above the threshold demand, maintaining all engine cylinders active.

4 . The method of claim 3 , wherein the cylinder pattern is selected to include a total number of deactivated/active engine cylinders.

5 . The method of claim 1 , further comprising, selecting the one scroll of the multi-scroll exhaust turbine based on one or more of turbine speed and the boost demand.

6 . The method of claim 5 , wherein the selecting includes, selecting a first, higher flow scroll when the exhaust turbine speed at a time of receiving the boost demand is higher, and selecting a second, lower flow scroll when the exhaust turbine speed at the time of receiving the boost demand is lower.

7 . The method of claim 5 , wherein the boost demand includes a predicted boost demand, and wherein the selecting includes, selecting a first, higher flow scroll when the predicted boost demand is lower, and selecting a second, lower flow scroll when the predicted boost demand is higher.

8 . The method of claim 7 , wherein the cylinder pattern is further selected based on one or more of engine load and engine NVH.

9 . The method of claim 8 , wherein the multi-scroll exhaust turbine is one of a plurality of multi-scroll exhaust turbines included in the boosted engine system, the method further comprising, selecting one of the plurality of multi-scroll exhaust turbines based on turbine temperature.

10 . A method for a boosted engine system, comprising:
in response to boost demand,
selectively deactivating individual cylinder valve mechanisms according to a cylinder pattern, the cylinder pattern selected to direct exhaust from active cylinders into one of a plurality of engine turbines.

11 . The method of claim 10 , wherein the one of a plurality of engine turbines is a first turbine coupled to a first compressor, the engine system further including a second turbine coupled to a second compressor, the first and second compressor having distinct compressor outlets.

12 . The method of claim 11 , wherein the boost demand includes a boost demand to lower than a threshold boost pressure.

13 . The method of claim 12 , further comprising, in response to a boost demand to higher than the threshold boost pressure, maintaining all engine cylinders active.

14 . The method of claim 13 , wherein the cylinder pattern is selected to include a total number of deactivated/active engine cylinders, the deactivated engine cylinders selected based on their firing order.

15 . The method of claim 10 , further comprising, selecting the one of a plurality of engine turbines based on turbine temperature.

16 . The method of claim 15 , wherein the selecting includes, selecting the turbine having a lower turbine temperature.

17 . The method of claim 10 , further comprising, selecting the one of a plurality of engine turbines based on turbine speed, where the turbine with a higher speed is selected.

18 . A method, comprising:
in response to a boost demand,
selectively deactivating a cylinder pattern of individual cylinder mechanisms to direct exhaust from active cylinders into each of a first and second turbine.

19 . The method of claim 18 , wherein the first turbine is coupled to a first compressor, the second turbine is coupled to a second compressor, and wherein the first and second compressors direct boosted aircharge to a common compressor outlet.

20 . The method of claim 19 , wherein the cylinder pattern includes a total number of deactivated/active engine cylinders, the cylinder pattern selected based on a firing order of active engine cylinders.

Assignees

• Ford Global Tech Llc

Inventors

• Vanderwege Brad Alan

Classifications

• F02D17/02 Primary

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

• F02B37/12

  Control of the pumps · CPC title

• F02D13/06

  Cutting-out cylinders · CPC title

• F02D41/0007

  for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12) · CPC title

• F02D23/02

  the engines being of fuel-injection type · CPC title