SYSTEM AND METHOD FOR CONTROLLING A FIRING SEQUENCE OF AN ENGINE TO REDUCE VIBRATION WHEN CYLINDERS OF THE ENGINE ARE DEACTIVATED
First Claim
1. A system comprising:
- a spectral density module that determines a spectral density of engine speed;
a firing sequence module that;
selects a first set of M cylinders of an engine to activate based on a driver torque request;
selects a second set of N cylinders of the engine to deactivate based on the driver torque request;
selects a firing sequence to activate the first set of M cylinders and to deactivate the second set of N cylinders, wherein the firing sequence specifies whether each cylinder of the engine is active or deactivated; and
based on the spectral density, adjusts the firing sequence to at least one of;
adjust which cylinders of the engine are included in the first set and which cylinders of the engine are included in the second set; and
adjust M and N, wherein M and N are integers greater than or equal to one.
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Accused Products
Abstract
A system according to the present disclosure includes a spectral density module and a firing sequence module. The spectral density module determines a spectral density of engine speed. The firing sequence module selects a first set of M cylinders of an engine to activate, selects a second set of N cylinders of the engine to deactivate, and selects a firing sequence to activate the first set of M cylinders and to deactivate the second set of N cylinders. M and N are integers greater than or equal to one. The firing sequence specifies whether each cylinder of the engine is active or deactivated. Based on the spectral density, the firing sequence module adjusts the firing sequence to adjust M and N and/or to adjust which cylinders of the engine are included in the first set and which cylinders of the engine are included in the second set.
58 Citations
20 Claims
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1. A system comprising:
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a spectral density module that determines a spectral density of engine speed; a firing sequence module that; selects a first set of M cylinders of an engine to activate based on a driver torque request; selects a second set of N cylinders of the engine to deactivate based on the driver torque request; selects a firing sequence to activate the first set of M cylinders and to deactivate the second set of N cylinders, wherein the firing sequence specifies whether each cylinder of the engine is active or deactivated; and based on the spectral density, adjusts the firing sequence to at least one of; adjust which cylinders of the engine are included in the first set and which cylinders of the engine are included in the second set; and adjust M and N, wherein M and N are integers greater than or equal to one. - 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 spectral density of engine speed; selecting a first set of M cylinders of an engine to activate based on a driver torque request; selecting a second set of N cylinders of the engine to deactivate based on the driver torque request; selecting a firing sequence to activate the first set of M cylinders and to deactivate the second set of N cylinders, wherein the firing sequence specifies whether each cylinder of the engine is active or deactivated; and based on the spectral density, adjusting the firing sequence to at least one of; adjust which cylinders of the engine are included in the first set and which cylinders of the engine are included in the second set; and adjust M and N, wherein M and N are integers greater than or equal to one. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification