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US 2016/0108828 A1Published application
If method and system for engine knock control
AssigneeFord Global Technologies, LLC
InventorsChris Paul Glugla, Brad Alan VanDerWege
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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.
Claims20
A method for an engine, comprising:
- deactivating individual cylinder valve mechanisms according to a cylinder pattern selected based on a knock value of each engine cylinder.
A method for an engine, comprising:
- deactivating a first cylinder in response to an indication of knock in the first cylinder;
- and reactivating the first cylinder in response to an indication of knock in a second cylinder.
An engine system, comprising:
- a first and a second engine cylinder, each of the first and second engine cylinder including independently actuated intake and exhaust values;
- a knock sensor for sensing knock in each of the first and second cylinder;
- a first and second temperature sensor for estimating an in-cylinder temperature of the first and second cylinder, respectively;
- and
- a controller with computer readable instructions stored on 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 an 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.