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US 9,506,411 B2Granted
If method and system for engine knock control
AssigneeFord Global Technologies, LLC
InventorsChris Paul Glugla, Brad Alan VanDerWege
Life of this patent
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Abstract
Methods and systems are provided for using selective cylinder deactivation for knock control with reduced fuel penalty. Cylinders with heavier knock and/or more borderline limited spark may be transiently deactivated until they are sufficiently cool. While reactivating the cylinders following cooling, other cylinders that are knocking, hot, or borderline spark limited may be deactivated.
Claims19
A method for an engine, comprising:
- with a controller, executing computer readable instructions stored in non-transitory memory to deactivate individual cylinder valve mechanisms according to a cylinder pattern selected based on a knock value of each engine cylinder, wherein the selecting includes selecting a first cylinder having a higher than threshold knock value for deactivation while maintaining a second cylinder having a lower than threshold knock value active during the deactivation.
A method for an engine, comprising:
- with a controller, executing computer readable instructions stored in non-transitory memory to:
- deactivate a first cylinder in response to an indication of knock in the first cylinder;
- and
- reactivate the first cylinder in response to an indication of knock in a second cylinder.
1 more element
An engine system, comprising:
- a first and a second engine cylinder, each of the first and second engine cylinders including independently actuated intake and exhaust valves;
- a knock sensor for sensing knock in each of the first and second cylinders;
- a first and a second temperature sensor for estimating an in-cylinder temperature of the first and the second cylinder, respectively;
- and
- a controller with computer readable instructions stored in non-transitory memory for:
- in response to a knock value of the first cylinder being higher than a first threshold while a knock value of the second cylinder is lower than a second threshold,
- deactivating the first cylinder for a number of combustion events until one of the in-cylinder temperature of the first cylinder is lower than a threshold temperature and the knock value of the second cylinder is higher than the second threshold;
- and
- reactivating the first cylinder while deactivating the second cylinder.
6 more elements
Dependencies are inferred from the claim text.