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US 2020/0102897 A1Published application
Method and system for determining engine knock background noise levels
AssigneeFord Global Technologies, LLC
InventorsChristopher Paul Glugla, Rani Kiwan, Mohannad Hakeem
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Abstract
Methods and systems are disclosed for operating an engine that includes a knock control system that may determine contributions of individual noise sources to an engine background noise level. The contributions of the individual noise sources may be the basis for establishing the presence or absence of knock in one or more engine cylinders. The contributions of individual noise sources may be determined when engine cylinders are deactivated.
Claims20
An engine operating method, comprising:
- deactivating a cylinder for one or more cycles of the cylinder via a controller;
- learning a base engine knock background noise level associated with the cylinder while the cylinder is deactivated;
- and
- adjusting engine operation according to a knock indication determined from the base engine knock background noise level.
1 more element
An engine operating method, comprising:
- deactivating a group of engine cylinders for one or more cycles of an engine via a controller;
- reactivating a first cylinder of the group of engine cylinders to diagnose operation of a catalyst;
- and
- adjusting timing of a knock window associated with a deactivated cylinder to determine a noise level of a closing valve or a closing fuel injector of a second cylinder other than the first cylinder.
1 more element
A system for operating an engine, comprising:
- an engine including at least one vibration sensing engine knock sensor;
- and
- a controller including executable instructions stored in non-transitory memory to adjust timing of a knock window of a deactivated cylinder such that the knock window is open when a poppet valve of a different cylinder closes.
Dependencies are inferred from the claim text.