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US 10,753,290 B2Granted
Method and system for determining engine knock background noise levels
AssigneeFord Global Technologies, LLC
InventorsChristopher Paul Glugla, Rani Kiwan, Mohannad Hakeem
Life of this patent
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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.
Claims16
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, where the base engine knock background noise level does not include noise from injectors or poppet valves closing during a knock window of the cylinder;
- adjusting engine operation according to a knock indication determined from the base engine knock background noise level;
- and
- moving closing of a poppet valve into the knock window of the cylinder after learning a base engine knock background noise level associated with the cylinder while the cylinder is deactivated, and learning an engine knock background noise level that includes noise of the poppet valve that closes during the knock window.
2 more elements
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:
- the 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, where the knock window is adjusted in response to a request to diagnose a catalyst.
Dependencies are inferred from the claim text.