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US 9,284,909 B2Granted
Method and system for knock control
AssigneeFord Global Technologies, LLC
InventorsSteven Wooldridge, Gopichandra Surnilla, Brad Alan Boyer, James Alfred Hilditch, Michael Howard Shelby, Chris Paul Glugla, Benjamin Richard Petersen
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for improving engine knock tolerance, in particular when rapidly ramping in LP-EGR from low levels of EGR. Until a desired LP-EGR rate is achieved, fuel may be delivered as a split injection with at least an intake stroke injection and a compression stroke injection to compensate for the transport delay in EGR filling the intake system. Subsequently, single fuel injection may be resumed.
Claims5
An engine method, comprising:
- during a first mode, operating with a lower than threshold EGR rate, and in response to a tip-in to higher load, maintaining single fuel injection per cycle and increasing opening of an LP-EGR valve;
- and
- during a second mode, operating with the lower than threshold EGR rate, and in response to a tip-in to higher load, operating with split fuel injection per cycle, and increasing opening of the LP-EGR valve.
Dependencies are inferred from the claim text.