Method and system for improving turbocharger efficiency

Patent metadata

Field	Value
Publication number	US-9835082-B2
Application number	US-201414516324-A
Country	US
Kind code	B2
Filing date	Oct 16, 2014
Priority date	Oct 16, 2014
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

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

The invention claimed is:

1. A method for a boosted engine system, comprising:
in response to a boost demand being below a boost threshold,
selectively deactivating individual cylinders of the boosted engine system to provide a cylinder pattern;
wherein the cylinder pattern includes a total number of deactivated and active cylinders; and
wherein the cylinder pattern is selected based on engine vibration and engine load to direct exhaust from the active cylinders into only one scroll of a multi-scroll exhaust turbine.

2. The method of claim 1 , further comprising, in response to the boost demand being above the boost threshold, activating all cylinders of the boosted engine system.

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

4. The method of claim 3 , wherein selecting the one scroll of the multi-scroll exhaust turbine further includes selecting one of an inner and an outer scroll of the multi-scroll exhaust turbine when the exhaust turbine speed at a time of receiving the boost demand is higher than an exhaust turbine speed threshold, and selecting a remaining one of the inner and the outer scroll of the multi-scroll exhaust turbine when the exhaust turbine speed at the time of receiving the boost demand is lower than the exhaust turbine speed threshold.

5. The method of claim 3 , wherein the boost demand includes a predicted boost demand, and wherein selecting the one scroll of the multi-scroll exhaust turbine further includes selecting one of an inner and an outer scroll of the multi-scroll exhaust turbine when the predicted boost demand is lower than the boost threshold, and selecting a remaining one of the inner and the outer scroll when the predicted boost demand is higher than the boost threshold.

Assignees

• Ford Global Tech Llc

Inventors

• Vanderwege Brad Alan

Classifications

• F02D2041/0012

  with selective deactivation of cylinders · CPC title

• F02D13/06

  Cutting-out cylinders · CPC title

• F02D23/02

  the engines being of fuel-injection type · CPC title

• F02D41/0007

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

• F02D21/08

  the other gas being the exhaust gas of engine · CPC title