METHOD AND SYSTEM FOR APPLYING ENGINE KNOCK WINDOWS
First Claim
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1. An engine operating method, comprising:
- ceasing to supply fuel to a first engine cylinder via a controller;
adjusting open timing of a knock window of the first engine cylinder to span a timing of a closing of a device of a second cylinder via the controller while fuel delivery to the first engine cylinder is ceased; and
sampling output of a knock sensor during the knock window via the controller.
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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.
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Citations
20 Claims
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1. An engine operating method, comprising:
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ceasing to supply fuel to a first engine cylinder via a controller; adjusting open timing of a knock window of the first engine cylinder to span a timing of a closing of a device of a second cylinder via the controller while fuel delivery to the first engine cylinder is ceased; and sampling output of a knock sensor during the knock window via the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An engine operating method, comprising:
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ceasing to supply fuel to all engine cylinders via a controller; adjusting poppet valve timing of all engine cylinders such that intake and exhaust valves do not close while knock windows of all engine cylinders are open via the controller while fuel delivery to all engine cylinders is ceased; and sampling output of one or more knock sensors while knock windows of all engine cylinders are open via the controller. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system for operating an engine, comprising:
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a variable displacement engine including at least one vibration sensing engine knock sensor; and a controller including executable instructions stored in non-transitory memory to sample output of a first engine knock sensor during opening of a first knock window of a first cylinder when the first cylinder is activated, and sampling output of a second engine knock sensor during opening of a second knock window of the first cylinder when the first cylinder is deactivated. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification