System and method for randomly adjusting a firing frequency of an engine to reduce vibration when cylinders of the engine are deactivated
First Claim
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1. A system comprising:
- a firing fraction module that determines a firing fraction based on a driver torque request;
an offset generation module that randomly generates an offset; and
a firing control module that;
sums the firing fraction and a running total each time that a crankshaft of an engine rotates through a predetermined angle;
sums the offset and the running total; and
controls an actuator of the engine to execute a firing event in a cylinder of the engine when the running total is greater than or equal to a predetermined value.
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Abstract
A system according to the principles of the present invention includes a firing fraction module, an offset generation module, and a firing fraction module. The firing fraction module determines a firing fraction based on a driver torque request. The offset generation module randomly generates an offset. The firing control module adds the firing fraction to a running total each time that a crankshaft of an engine rotates through a predetermined angle, adds the offset to the running total, and executes a firing event in a cylinder of the engine when the running total is greater than or equal to a predetermined value.
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Citations
20 Claims
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1. A system comprising:
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a firing fraction module that determines a firing fraction based on a driver torque request; an offset generation module that randomly generates an offset; and a firing control module that; sums the firing fraction and a running total each time that a crankshaft of an engine rotates through a predetermined angle; sums the offset and the running total; and controls an actuator of the engine to execute a firing event in a cylinder of the engine when the running total is greater than or equal to a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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determining a firing fraction based on a driver torque request; randomly generating an offset; summing the firing fraction and a running total each time that a crankshaft of an engine rotates through a predetermined angle; summing the offset and the running total; and controlling an actuator of the engine to execute a firing event in a cylinder of the engine when the running total is greater than or equal to a predetermined value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification