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US 9,957,907 B2Granted
Method and system for pre-ignition control
AssigneeFord Global Technologies, LLC
InventorsChris Paul Glugla, James Matthew Kindree, Lee Benjamin McQuinn
Life of this patent
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Abstract
Methods and systems are provided for improving the detection and mitigation of high speed pre-ignition. In one example, high speed pre-ignition is detected based on concurrent or sequential changes in an integrated knock sensor output in a knock window as well as a pre-ignition window. The high speed pre-ignition is addressed using cylinder fuel deactivation and/or engine load limiting to reduce the risk for run-away pre-ignition.
Claims16
A method for an engine, comprising:
- indicating pre-ignition based on each of an integrated knock sensor output in a knock window and an integrated knock sensor output in a pre-ignition window;
- and
- responsive to pre-ignition, limiting engine load by reducing a boost level.
A method for an engine, comprising:
- indicating low speed pre-ignition based on knock sensor output assessed in each of a knock window and a pre-ignition window;
- indicating high speed pre-ignition based on an integrated knock sensor output, integrated over a number of engine cycles, in each of the knock window and the pre-ignition window;
- and
- limiting engine load responsive to the low speed pre-ignition.
1 more element
Dependencies are inferred from the claim text.