Method and system for pre-ignition control

Patent metadata

Field	Value
Publication number	US-9797327-B2
Application number	US-201414510996-A
Country	US
Kind code	B2
Filing date	Oct 9, 2014
Priority date	Dec 18, 2013
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

Methods and systems are provided for adjusting spark and/or fuel injection to a cylinder based on late combustion, partial burn, or misfire in a neighboring cylinder. In one example, a method may include deactivating spark and fuel injection to a second cylinder receiving exhaust residuals from combustion in a first cylinder, the first cylinder experiencing a misfire or late combustion event. Mitigating actions are performed in the second cylinder before the occurrence of a pre-ignition event.

First claim

The invention claimed is:

1. An engine control method, comprising:
in response to a first timing of combustion in a first cylinder being retarded from a threshold timing by a first smaller amount, selectively deactivating one of fuel and spark ignition to a second cylinder receiving exhaust residuals from the combustion in the first cylinder; and
in response to a second timing of combustion in the first cylinder being retarded from the threshold timing by a second larger amount, deactivating spark ignition and fuel to the second cylinder.

2. The method of claim 1 , wherein the second cylinder is identified based on each of an identity of the first cylinder, a firing order of the engine, and an exhaust manifold configuration of the engine.

3. The method of claim 2 , further comprising, in response to the second timing, further deactivating fuel and spark to a third cylinder receiving exhaust residuals from the second cylinder.

4. The method of claim 3 , wherein the threshold timing is based on a timing at which a threshold mass fraction of burned fuel remains in the first cylinder.

5. The method of claim 4 , wherein the selectively deactivating fuel and spark ignition is performed before receiving an indication of pre-ignition in the second cylinder.

6. The method of claim 1 , wherein a larger mass of unburned fuel remains in the first cylinder at the second timing relative to the first timing.

Assignees

• Ford Global Tech Llc

Inventors

• Glugla Chris Paul
• Czekala Michael Damian

Classifications

• F02D41/006

  using internal EGR (control of valve overlap for internal EGR F02D13/0261; arrangements for internal EGR F02M26/01) · CPC title

• F02D37/02

  one of the functions being ignition · CPC title

• F02D13/0207

  changing valve lift or valve lift and timing · CPC title

• F02D19/084

  Blends of gasoline and alcohols, e.g. E85 · CPC title

• G01L23/225

  circuit arrangements therefor · CPC title