Noise/vibration reduction control
First Claim
1. A method of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain that includes an engine capable of skip fire operation, the engine including a plurality of working chambers, the method comprising:
- operating the engine in a skip fire mode at a first effective displacement; and
actively controlling a device that is not a part of the powertrain in a feed forward manner, during the skip fire operation at the first effective displacement, to alter the NVH characteristic of the vehicle in a desired manner based at least in part on specific individual skip fire firing decisions, each specific individual skip fire firing decision being indicative of whether to skip or fire an individual working chamber during a single associated skip fire firing opportunity, wherein for each skip fire firing decision, the device is controlled differently during the associated skip fire firing opportunity based on whether the associated skip fire firing decision is a skip or a fire, the control of the device varying over the course of each engine cycle in accordance with the specific individual skip fire firing decisions associated with that engine cycle during the skip fire operation of the engine at the first effective displacement.
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Accused Products
Abstract
Systems and methods for reducing noise or vibration generated by an internal combustion engine are described. An engine controller is arranged to operate the working chambers of the engine in a cylinder output level modulation manner A noise/vibration reduction unit actively control of a device that is not a part of the powertrain. The device is controlled in a feed forward manner to alter an NVH characteristic of the vehicle in a desired manner based at least in part on a characteristic of the cylinder output level modulation operation of the engine.
271 Citations
22 Claims
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1. A method of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain that includes an engine capable of skip fire operation, the engine including a plurality of working chambers, the method comprising:
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operating the engine in a skip fire mode at a first effective displacement; and actively controlling a device that is not a part of the powertrain in a feed forward manner, during the skip fire operation at the first effective displacement, to alter the NVH characteristic of the vehicle in a desired manner based at least in part on specific individual skip fire firing decisions, each specific individual skip fire firing decision being indicative of whether to skip or fire an individual working chamber during a single associated skip fire firing opportunity, wherein for each skip fire firing decision, the device is controlled differently during the associated skip fire firing opportunity based on whether the associated skip fire firing decision is a skip or a fire, the control of the device varying over the course of each engine cycle in accordance with the specific individual skip fire firing decisions associated with that engine cycle during the skip fire operation of the engine at the first effective displacement. - View Dependent Claims (2, 3, 4, 5)
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6. A method of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain that includes an engine capable of skip fire operation, the engine including a plurality of working chambers, the method comprising:
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operating the engine in a skip fire mode at a first effective displacement; and actively controlling a device that is not a part of the powertrain in a feed forward manner, during the skip fire operation at the first effective displacement, to alter the NVH characteristic of the vehicle in a desired manner based at least in part on specific individual skip fire firing decisions, each specific individual skip fire firing decision being indicative of whether to skip or fire an individual working chamber during a single associated skip fire firing opportunity, wherein for each skip fire firing decision, the device is controlled differently during the associated skip fire firing opportunity based on whether the associated skip fire firing decision is a skip or a fire, the control of the device varying over the course of each engine cycle in accordance with the specific individual skip fire firing decisions associated with that engine cycle during the skip fire operation of the engine at the first effective displacement, wherein at least two filters are used in the active control of the device during the skip fire operation of the engine at the first effective displacement to shape the response of the device; using a first one of the filters in association with skipped firing opportunities of the skip fire working chambers that occur during the skip fire operation of the engine at the first effective displacement, wherein the first filter is not used in association with fired firing opportunities of the skip fire working chambers that occur during skip fire operation of the engine at the first effective displacement; and using a second one of the filters in association with fired firing opportunities of the skip fire working chamber that occur during the skip fire operation of the engine at the first effective displacement, wherein the second filter is not used in association with the skipped firing opportunities of the skip fire working chamber that occur during the skip fire operation of the engine at the first effective displacement.
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7. A method of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain that includes an engine during cylinder output level modulation operation of the engine, the engine including a plurality of working chambers, the method comprising:
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operating the engine in the cylinder output level modulation mode at a first effective displacement; and actively controlling a device that is not a part of the powertrain in a feed forward manner, during the cylinder output level modulation operation at the first effective displacement, to alter the NVH characteristic of the vehicle in a desired manner based at least in part on specific individual cylinder output level decisions, each specific individual cylinder output level decision being indicative of a desired cylinder output level for an associated cylinder during a single associated firing opportunity, wherein for each cylinder output level decision, the device is controlled differently during the associated firing opportunity based on the associated cylinder output level decision, the control of the device varying over the course of each engine cycle in accordance with the specific individual cylinder output level decisions associated with that engine cycle during the cylinder output level operation of the engine at the first effective displacement. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain that includes an engine during cylinder output level modulation operation of the engine, the engine including a plurality of working chambers, the method comprising:
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operating the engine in the cylinder output level modulation mode at a first effective displacement; and actively controlling a device that is not a part of the powertrain in a feed forward manner, during the cylinder output level modulation operation at the first effective displacement, to alter the NVH characteristic of the vehicle in a desired manner based at least in part on specific individual cylinder output level decisions, each specific individual cylinder output level decision being indicative of a desired cylinder output level for an associated cylinder during a single associated firing opportunity, wherein for each cylinder output level decision, the device is controlled differently during the associated firing opportunity based on the associated cylinder output level decision, the control of the device varying over the course of each engine cycle in accordance with the specific individual cylinder output level decisions associated with that engine cycle during the cylinder output level operation of the engine at the first effective displacement, wherein at least two filters are used in the active control of the device during the cylinder output level modulation operation of the engine at the first effective displacement to shape the response of the device; using a first one of the filters in association with firing opportunities having a first associated firing level that occur during the cylinder output level modulation operation of the engine at the first effective displacement, wherein the first filter is not used in association with firing opportunities having a second associated firing level that occur during the cylinder output level modulation operation of the engine at the first effective displacement; and using a second one of the filters in association with firing opportunities having the second associated firing level that occur during the cylinder output level modulation operation of the engine at the first effective displacement, wherein the second filter is not used in association with the firing opportunities of having the first associated firing level that occur during the cylinder firing level modulation operation of the engine at the first effective displacement.
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15. A system for reducing NVH generated by an internal combustion engine during cylinder output level modulation operation of the engine, the internal combustion engine having a plurality of working chambers and a cylinder output level modulation engine controller arranged to direct cylinder output level modulation operation of the engine, the system comprising:
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at least one actuator that is not part of a powertrain that includes the engine; and a NVH controller arranged to actively control actuation of the at least one actuator in a feed forward manner during cylinder level modulation operation of the engine at a first effective firing fraction to facilitate mitigation of an NVH characteristic associated with the cylinder level modulation operation of the engine at the first effective firing fraction, wherein the feed forward control is based at least in part on specific individual cylinder output level decisions, each specific individual cylinder output level decision being indicative of a desired cylinder output level for an associated cylinder during a single associated firing opportunity, wherein for each cylinder output level decision, the actuator is controlled differently during the associated firing opportunity based on the associated cylinder output level decision, the control of the actuator varying over the course of each engine cycle in accordance with the specific individual cylinder output level decisions associated with that engine cycle during the cylinder output level operation of the engine at the first effective displacement. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification