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US 8,997,723 B2Granted
Method and system for pre-ignition control
AssigneeFord Global Technologies, LLC
InventorsChris Paul Glugla, Michael Damian Czekala
Life of this patent
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Abstract
Methods and systems are provided for reducing late burn induced cylinder pre-ignition events. In response to a late burn combustion event in a cylinder, ignition coil dwell time is extended in the cylinder to reduce unintended combustion delays. In addition, pre-ignition mitigating actions are performed in a neighboring cylinder that may be prone to pre-ignition induced by the late combustion event.
Claims18
A method for an engine, comprising:
- in response to timing of combustion in a first cylinder being later than a threshold during a transient over-torque condition, selectively increasing spark ignition output for the combustion in the first cylinder while selectively enriching a second cylinder based on the timing of combustion in the first cylinder, the second cylinder receiving exhaust residuals from the first cylinder.
A method for a boosted engine, comprising:
- during an over-torque condition,
- reducing engine torque by retarding spark timing in a first cylinder;
- and
- adjusting spark ignition energy for a combustion event in the first cylinder based on a torque reduction ratio at the retarded spark timing relative to a threshold, the threshold based on a pre-ignition history of a second cylinder receiving exhaust residuals from combustion in the first cylinder.
1 more element
An engine system, comprising:
- an engine including a plurality of cylinders;
- a turbocharger for providing engine boost;
- an ignition coil supplying electrical energy to a spark plug;
- and
- a control system with computer-readable instructions for,
- retarding spark ignition timing in a first cylinder to reduce combustion torque;
- increasing an ignition coil dwell time during a combustion event in the first cylinder based on a torque ratio achieved at the retarded spark ignition timing;
- and
- enriching a second cylinder receiving exhaust residuals from the first cylinder in response to the torque ratio in the first cylinder.
6 more elements
Dependencies are inferred from the claim text.