Strategies for resonance management
First Claim
1. A method for managing forcing function frequency profiles during operation of a multi-cylinder engine, each cylinder of the engine comprising a respective variable cylinder torque output which provides a corresponding forcing function frequency profile, the engine comprising a variable aggregate torque output comprising the sum of the cylinder torque outputs of each of the cylinders and comprising the sum of the forcing function frequency profiles of each of the cylinders, and the engine comprising a respective baseline aggregate torque output for each nonzero reciprocation speed of a reciprocating piston assembly coupled to the cylinders, wherein each respective baseline aggregate torque output provides a respective baseline of primary forcing function frequency profiles, and wherein the respective baseline aggregate torque output corresponds to active operation modes for each cylinder, where active operation modes comprise sequential actuation of an intake valve, a fuel injector, and an exhaust valve for each cylinder, the method comprising:
- selecting a first stroke mode for a first cylinder, the first stroke mode comprising at least a sequential deactive operation of respective opening and respective closing of a corresponding first intake valve and a corresponding first exhaust valve during at least two reciprocations of a corresponding first reciprocating piston of the reciprocating piston assembly operating within the first cylinder;
selecting a second stroke mode for a second cylinder, the second stroke mode comprising at least a sequential active operation of respective opening and respective closing of a corresponding second intake valve and a corresponding second fuel injector during at least a first reciprocation and during a second reciprocation of a corresponding second reciprocating piston of the reciprocating piston assembly operating within the second cylinder;
operating the first stroke mode and the second stroke mode to form a first aggregate torque output that provides a sum of the forcing function frequency profiles of each of the cylinders that is less than or approximate in amplitude and approximate in frequency value to a first baseline of primary forcing function frequency profiles of a first baseline aggregate torque output.
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Accused Products
Abstract
Methods are provided for managing forcing function frequency profiles during operation of a multi-cylinder engine. A first stroke mode for a first cylinder is selected and comprises at least a sequential deactive operation of the opening and the closing of a first intake valve and a first exhaust valve during at least two reciprocations of a first reciprocating piston. The first stroke mode is operated on the first cylinder, a second stroke mode is operated on a second cylinder, and a third stroke mode is operated on the remaining cylinders to meet or exceed a required torque output and to form a first aggregate of forcing function frequency profiles that comprises primary forcing function frequency profiles that are less than or approximate in amplitude and less than or approximate in frequency value to one of the respective baseline of primary forcing function frequency profiles.
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Citations
35 Claims
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1. A method for managing forcing function frequency profiles during operation of a multi-cylinder engine, each cylinder of the engine comprising a respective variable cylinder torque output which provides a corresponding forcing function frequency profile, the engine comprising a variable aggregate torque output comprising the sum of the cylinder torque outputs of each of the cylinders and comprising the sum of the forcing function frequency profiles of each of the cylinders, and the engine comprising a respective baseline aggregate torque output for each nonzero reciprocation speed of a reciprocating piston assembly coupled to the cylinders, wherein each respective baseline aggregate torque output provides a respective baseline of primary forcing function frequency profiles, and wherein the respective baseline aggregate torque output corresponds to active operation modes for each cylinder, where active operation modes comprise sequential actuation of an intake valve, a fuel injector, and an exhaust valve for each cylinder, the method comprising:
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selecting a first stroke mode for a first cylinder, the first stroke mode comprising at least a sequential deactive operation of respective opening and respective closing of a corresponding first intake valve and a corresponding first exhaust valve during at least two reciprocations of a corresponding first reciprocating piston of the reciprocating piston assembly operating within the first cylinder; selecting a second stroke mode for a second cylinder, the second stroke mode comprising at least a sequential active operation of respective opening and respective closing of a corresponding second intake valve and a corresponding second fuel injector during at least a first reciprocation and during a second reciprocation of a corresponding second reciprocating piston of the reciprocating piston assembly operating within the second cylinder; operating the first stroke mode and the second stroke mode to form a first aggregate torque output that provides a sum of the forcing function frequency profiles of each of the cylinders that is less than or approximate in amplitude and approximate in frequency value to a first baseline of primary forcing function frequency profiles of a first baseline aggregate torque output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for managing forcing function frequency profiles during operation of a multi-cylinder engine, each cylinder of the engine comprising a respective variable cylinder torque output which provides a corresponding forcing function frequency profile, the engine comprising a variable aggregate torque output comprising the sum of the cylinder torque outputs of each of the cylinders and comprising the sum of the forcing function frequency profiles of each of the cylinders, and the engine comprising a respective baseline aggregate torque output for each nonzero reciprocation speed of a reciprocating piston assembly coupled to the cylinders, wherein each respective baseline aggregate torque provides a respective baseline of primary forcing function frequency profiles, and wherein the respective baseline aggregate torque output corresponds to active operation modes for each cylinder, where active operation modes comprise sequential actuation of an intake valve, a fuel injector, and an exhaust valve for each cylinder, the method comprising:
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selecting a first stroke mode for the cylinders, the first stroke mode comprising at least a sequential deactive operation of a respective opening and a respective closing of a corresponding first intake valve and a corresponding first exhaust valve during at least two reciprocations of a corresponding reciprocating piston of the reciprocating piston assembly operating within the cylinders; injecting fuel in to the cylinders during the deactive operation; timing the operating of the first stroke mode on the cylinders to form a first aggregate torque output that provides a sum of the forcing function frequency profiles of each of the cylinders that is less than or approximate in amplitude and approximate in frequency value to a first baseline of primary forcing function frequency profiles of a first baseline aggregate torque output. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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33. A method for managing forcing function frequency profiles during operation of a multi-cylinder engine, each cylinder of the engine providing a respective variable cylinder forcing function frequency profile, the engine comprising a variable aggregate of forcing function frequency profiles summing the respective variable cylinder forcing function frequency profiles of each of the cylinders, where the aggregate of forcing function frequency profiles is variable in response to changes in the stroke modes selected for the cylinders and in response to changes in crankshaft rotations per minute, and the engine comprises a respective baseline of primary forcing function frequency profiles for each nonzero reciprocation speed of a reciprocating piston assembly coupled to the cylinders, wherein each respective baseline of primary forcing function frequency profiles corresponds to active operation modes for each cylinder, where active operation modes comprise sequential actuation of an intake valve, a fuel injector, and an exhaust valve for each cylinder, the method comprising:
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determining a required torque output for the operating engine; selecting a first stroke mode for a first cylinder, the first stroke mode comprising at least a sequential deactive operation of respective opening and respective closing of a corresponding first intake valve and a corresponding first exhaust valve during at least two reciprocations of a corresponding first reciprocating piston of the reciprocating piston assembly operating within the first cylinder; selecting a second stroke mode for a second cylinder, the second stroke mode comprising at least a sequential deactive operation of respective opening and respective closing of a corresponding second intake valve and a corresponding second exhaust valve during at least two reciprocations of a corresponding second reciprocating piston of the reciprocating piston assembly operating within the second cylinder; operating the first stroke mode on the first cylinder, the second stroke mode on the second cylinder, and at least a third stroke mode on the remaining cylinders to meet or exceed the required torque output and to form a first aggregate of forcing function frequency profiles that comprises primary forcing function frequency profiles that are less than or approximate in amplitude and less than or approximate in frequency value to one of the respective baseline of primary forcing function frequency profiles. - View Dependent Claims (34, 35)
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Specification