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US 2016/0237922 A1Published application
Method and system for knock control
AssigneeFord Global Technologies, LLC
InventorsBrad Alan VanDerWege, Michael Howard Shelby
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for improving engine knock control by accounting for a drop in charge cooling efficiency of a knock control fluid at higher temperatures. In response to the prediction of an elevated temperature of a knock control fluid at a time of release from a direct injector, a pulse width of the injection is adjusted. Any knock relief deficits are compensated for using alternate engine adjustments, such as boost or spark timing adjustments.
Claims17
A method for an engine, comprising:
- boosting intake air with a compressor;
- and
- responsive to engine knock,
- direct injecting a knock control fluid into an engine cylinder from a previously deactivated direct injector;
- and
- adjusting an injection parameter of the direct injection based on a temperature of the knock control fluid at a time of release from a direct injector and further based on a composition of the knock control fluid.
3 more elements
A system, comprising:
- an engine having a turbocharger and a variable valve timing system for engine cylinder valves;
- and
- a controller with instructions stored in non-transitory memory for
- during a first condition, when knock occurs and a direct injector is already activated, direct injecting a knock control fluid with a first pulse width based on an indication of the knock;
- and
- during a second condition, when knock occurs and the direct injector was previously deactivated, direct injecting the knock control fluid with a second pulse width longer than the first pulse width.
3 more elements
A method for an engine, comprising:
- boosting engine intake air to the engine with a compressor of a turbocharger;
- inducting boosted intake air to a cylinder through cylinder valves, the valves operating with variable valve timing;
- and
- temporarily increasing a pulse width of injection of a knock control fluid from a direct injector into an engine cylinder responsive to an indication of knock based on the injector being previously deactivated.
1 more element
Dependencies are inferred from the claim text.