Method and system for pre-ignition control
AssigneeFord Global Technologies, LLC
InventorsJohn Eric Rollinger, Robert Roy Jentz, Robert Sarow Baskins, Chris Paul Glugla, Karen Willard
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Abstract
Methods and systems are provided for mitigating engine pre-ignition based on a feed-forward likelihood of pre-ignition and feedback from a pre-ignition event. In response to an indication of pre-ignition, a cylinder may be enriched while an engine load is limited. The enrichment may be followed by an enleanment to restore exhaust catalyst feed-gas oxygen levels. The mitigating steps may be adjusted based on engine operating conditions, a pre-ignition count, as well as the nature of the pre-ignition.
Claims16
A method for an engine, comprising,
- enriching an engine cylinder and limiting engine load in response to a trip pre-ignition count over a drive cycle and a lifetime pre-ignition count.
A method for an engine, comprising,
- boosting engine intake air;
- direct injecting fuel into a cylinder;
- spark-igniting combustion;
- and
- enriching the fuel injection and limiting engine load of the cylinder in response to a trip pre-ignition count over a drive cycle and a lifetime pre-ignition count.
A method for an engine, comprising,
- boosting engine intake air;
- direct injecting fuel into a cylinder;
- spark-igniting combustion;
- and
- enriching the fuel injection and limiting engine load of the cylinder in response to a trip pre-ignition count over a drive cycle and a lifetime pre-ignition count, and in response to a persistence of the pre-ignition.
Dependencies are inferred from the claim text.