Noise/vibration reduction control
First Claim
1. A method of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain having an engine during cylinder output level modulation operation of the engine, the engine including a plurality of working chambers, the method comprising:
- operating the engine in a cylinder output level modulation mode at a first effective firing fraction, wherein operation of the engine at the first effective firing fraction causes the working chambers to be fired in a repeating firing sequence having a defined repeating minimum cycle length that is not an integer factor or multiple of the number of working chambers in the engine; 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 firing fraction based at least in part on a current engine speed and at least one of the minimum repeating pattern length, the first effective firing fraction or a then current operational engine order, to alter the NVH characteristic of the vehicle in a desired manner.
1 Assignment
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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.
263 Citations
21 Claims
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1. A method of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain having 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 a cylinder output level modulation mode at a first effective firing fraction, wherein operation of the engine at the first effective firing fraction causes the working chambers to be fired in a repeating firing sequence having a defined repeating minimum cycle length that is not an integer factor or multiple of the number of working chambers in the engine; 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 firing fraction based at least in part on a current engine speed and at least one of the minimum repeating pattern length, the first effective firing fraction or a then current operational engine order, to alter the NVH characteristic of the vehicle in a desired manner. - 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 having 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 a cylinder output level modulation mode at a first effective firing fraction, wherein operation of the engine at the first effective firing fraction causes the working chambers to be fired in a repeating firing sequence having a defined repeating minimum cycle length that is not an integer factor or multiple of the number of working chambers in the engine; actively controlling a device that is not a part of the powertrain in a feed forward manner based at least in part on a current engine speed and at least one of the minimum repeating pattern length, the first effective firing fraction or a then current operational engine order, to alter the NVH characteristic of the vehicle in a desired manner, wherein a variable filter is used to shape the response of the device during the cylinder output level modulation operation of the engine at the first effective firing fraction; and inputting selected filter coefficients to the variable filter, wherein the filter coefficients are selected based at least in part on the engine order. - View Dependent Claims (7, 8)
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9. A of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain having 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 a cylinder output level modulation mode at a first effective firing fraction, wherein operation of the engine at the first effective firing fraction causes the working chambers to be fired in a repeating firing sequence having a defined repeating minimum cycle length that is not an integer factor or multiple of the number of working chambers in the engine; and actively controlling a flow regulator positioned in the engine'"'"'s exhaust path in a feed forward manner based at least in part on a current engine speed and at least one of the minimum repeating pattern length, the first effective firing fraction or a then current operational engine order, to mitigate exhaust related noises associated with cylinder output level modulation operation of the engine.
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10. A method of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain having 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 a cylinder output level modulation mode at a first effective firing fraction, wherein operation of the engine at the first effective firing fraction causes the working chambers to be fired in a repeating firing sequence having a defined repeating minimum cycle length that is not an integer factor or multiple of the number of working chambers in the engine; actively controlling a device that is not a part of the powertrain in a feed forward manner based at least in part on a current engine speed and at least one of the minimum repeating pattern length, the first effective firing fraction or a then current operational engine order, to alter the NVH characteristic of the vehicle in a desired manner, wherein the device includes at least one actuator arranged to vibrate a structure associated with the vehicle; and while the engine is operating in the cylinder output level modulation mode at the first effective firing fraction, the at least one actuator is controlled in a manner that mitigates selected vibrations associated with cylinder output level modulation operation of the engine.
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11. A method of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain having 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 a cylinder output level modulation mode at a first effective firing fraction, wherein operation of the engine at the first effective firing fraction causes the working chambers to be fired in a repeating firing sequence having a defined repeating minimum cycle length that is not an integer factor or multiple of the number of working chambers in the engine and wherein the cylinder output level modulation mode has three levels, a high firing level, a low firing level and a skipped firing opportunity, a firing fraction gives the fraction of fired firing opportunities to total firing opportunities, a level fraction gives the fraction of high firing level firings to total firings, the firing fraction has a numerator and denominator, the level fraction has a numerator and denominator, and the minimum repeating pattern length is given by a product of the firing fraction denominator and the level fraction denominator divided by the greatest common factor between the firing fraction numerator and the level fraction denominator; 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 firing fraction based at least in part on a current engine speed and at least one of the minimum repeating pattern length, the first effective firing fraction or a then current operational engine order, to alter the NVH characteristic of the vehicle in a desired manner, wherein for a given operational engine speed, a controller is configured to control the device substantially the same for two different effective firing fractions having the same minimum repeating pattern length.
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12. A method of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain having 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 a cylinder output level modulation mode at an effective first firing fraction that has a minimum repeating pattern length; 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 of the engine to alter the NVH characteristic of the vehicle in a desired manner based at least in part on a current engine speed and the minimum repeating pattern length, wherein for a given engine speed, the device is controlled substantially the same while operating at a plurality of different effective firing fractions that have the same minimum repeating pattern length.
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13. 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 a current engine speed and at least one of a minimum repeating pattern length, the first effective firing fraction, a then current operational engine order, or a harmonic of the then current operational engine order. - View Dependent Claims (14, 15)
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16. 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 a current engine speed and at least one of a minimum repeating pattern length, the first effective firing fraction, a then current operational engine order, or a harmonic of the then current operational engine order wherein the at least one actuator includes at least one active engine mount that serves as the actively controlled device, each active engine mount having an adjustable stiffness or damping characteristic; and wherein the stiffness or damping characteristic of the at least one active engine mount is controlled in a manner that mitigates selected vibrations associated with cylinder output level modulation operation of the internal combustion engine at the first effective firing fraction.
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17. 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 a current engine speed and at least one of a minimum repeating pattern length, the first effective firing fraction, a then current operational engine order, or a harmonic of the then current operational engine order wherein the NVH controller includes a variable filter arranged to shape the response of the actuator during operation of the engine at the first effective firing fraction, and a filter coefficient setter arranged to set selected filter coefficients of the variable filter. - View Dependent Claims (18, 19)
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20. 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 a current engine speed and at least one of a minimum repeating pattern length, the first effective firing fraction, a then current operational engine order, or a harmonic of the then current operational engine order, and wherein the NVH controller includes a plurality of filters arranged to shape the response of the actuator, wherein each filter is used in association with an associated one of the working chambers during the cylinder output level modulation operation of the internal combustion engine at the first effective firing fraction such that different filters are used in connection with working chambers during the cylinder output level modulation operation of the internal combustion engine at the first effective firing fraction.
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21. A method of mitigating or adjusting an NVH characteristic of a vehicle having a powertrain that includes an engine capable of cylinder output level modulation operation, the engine including a plurality of working chambers, the method comprising:
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operating the engine in a cylinder output level modulation mode at a first effective firing fraction; and actively controlling a device that is not a part of the power train in a feed forward manner during the cylinder output level modulation operation at the first effective firing fraction, to alter the NVH characteristic of the vehicle in a desired manner based at least in part on specific working chamber output level decisions, each specific working chamber output level decision being indicative of a desired output level for an individual associated working chamber during a single associated firing opportunity, wherein for each firing opportunity, the device is controlled differently during the associated firing opportunity based on the associated output level decision, whereby the control of the device varies in accordance with the output level decisions over the course of each engine cycle during the cylinder output level modulation operation of the engine at the first effective firing fraction.
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Specification