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US 2017/0370311 A1Published application
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.
Claims20
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
An engine system, comprising:
- an engine cylinder;
- a knock sensor coupled to the engine cylinder;
- a direct fuel injector for injecting fuel into the engine cylinder;
- an intake throttle;
- a turbocharger having an intake compressor and an exhaust turbine;
- and
- a controller configured with computer-readable instructions stored in non-transitory memory for:
- measuring an output of the knock sensor in a first, later knock window over a first number of engine cycles;
- measuring the output of the knock sensor in a second, earlier pre-ignition window over a second number of engine cycles;
- integrating the output of the knock sensor in each of the first, later knock window and the second, earlier pre-ignition window;
- indicating pre-ignition based on the integrated output in the first, later knock window relative to the integrated output in the second, earlier pre-ignition window;
- and
- adjusting an opening of the intake throttle and a wastegate of the exhaust turbine based on the indicating.
10 more elements
Dependencies are inferred from the claim text.