Back to results
US 8,543,315 B2Granted
Method and system for pre-ignition control
AssigneeFord Global Technologies, LLC
InventorsChristopher P. Glugla, Michael A. Mancini
Life of this patent
Estimating the term…
Abstract
Methods are provided for controlling an engine in response to a pre-ignition event. A pre-ignition threshold and a pre-ignition mitigating action are adjusted based on a rate of change of cylinder aircharge. As a result, pre-ignition events occurring during transient engine operating conditions are detected and addressed different from pre-ignition events occurring during steady-state engine operating conditions.
Claims5
A method for an engine cylinder, comprising:
- in response to transient pre-ignition, injecting a first amount of fuel over a first number of injections, the first number and a duration between the injections based on rate of change in cylinder aircharge;
- in response to intermittent pre-ignition, injecting a second, larger amount of fuel over a second number of injections, the second number and a duration between the injections based on a cylinder pre-ignition count;
- and
- in response to persistent pre-ignition, injecting a third amount of fuel over a third number of injections, the third amount larger than each of the first and second amounts, the third number and a duration between the injections based on the cylinder pre-ignition count.
1 more element
Dependencies are inferred from the claim text.