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Strategies for resonance management

  • US 10,358,990 B2
  • Filed: 06/28/2017
  • Issued: 07/23/2019
  • Est. Priority Date: 06/28/2016
  • Status: Active Grant
First Claim
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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:

  • 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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