System for method for controlling engine knock of a variable displacement engine
First Claim
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1. A method for operating an engine, comprising:
- operating the engine with a first group of combusting cylinders in response to a first condition;
operating the engine with a second group of combusting cylinders in response to a second condition;
adjusting spark timing of a cylinder in response to an indication of knock via a first group of sensors during the first condition; and
adjusting spark timing of the cylinder in response to an indication of knock via a second group of sensors during the second condition.
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Abstract
Systems and methods for detecting and controlling knock in an engine are presented. In one example, engine knock sensors are selected based on whether or not certain cylinders are activated and combusting air and fuel or deactivated and not combusting air and fuel. Output of selected knock sensors is the basis for adjusting engine spark timing.
41 Citations
20 Claims
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1. A method for operating an engine, comprising:
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operating the engine with a first group of combusting cylinders in response to a first condition; operating the engine with a second group of combusting cylinders in response to a second condition; adjusting spark timing of a cylinder in response to an indication of knock via a first group of sensors during the first condition; and adjusting spark timing of the cylinder in response to an indication of knock via a second group of sensors during the second condition. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for operating an engine, comprising:
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adjusting spark supplied to a cylinder in response to output of a first knock sensor when a first group of cylinders is deactivated via ceasing fuel flow and not air flow to the first group of cylinders; and adjusting spark supplied to the cylinder in response to output of a second knock sensor when the first group of cylinders is deactivated via ceasing fuel flow and air flow to the cylinder. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A vehicle system, comprising:
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an engine; and a controller including non-transitory executable instructions, which when executed by the controller, cause the controller to vary an actual total number of cylinders combusting air and fuel in the engine at an engine speed and load, varying which cylinders combust air and fuel at the engine speed and load, and adjust spark timing of the engine in response to output of a first knock sensor when a cylinder is deactivated via ceasing fuel injection and not air flow to the cylinder, and further instructions to adjust spark timing of the engine in response to output of a second knock sensor when the cylinder is deactivated via ceasing fuel injection and air flow to the cylinder. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification