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Noise, vibration and harshness reduction in a skip fire engine control system

  • US 10,221,786 B2
  • Filed: 11/01/2016
  • Issued: 03/05/2019
  • Est. Priority Date: 01/12/2015
  • Status: Active Grant
First Claim
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1. A powertrain controller for directing operation of an internal combustion engine having a plurality of cylinders, each cylinder being arranged to operate in a sequence of working cycles, each working cycle having an associated firing opportunity, the internal combustion engine having an associated engine cycle that constitutes one firing opportunity for each cylinder, the powertrain controller comprising:

  • a firing controller arranged to direct firings in a sequence of cylinder working cycles, wherein selected first working cycles are directed to have a greater torque output than selected second working cycles within the same engine cycle, the first and second working cycles being interspersed; and

    an NVH reduction module that is configured to (a) determine a smoothing torque to be applied to a powertrain by an energy storage/release device, the determination of the smoothing torque being affirmatively made during operation of the engine, and (b) direct the energy storage/release device to apply the smoothing torque to the powertrain, wherein the smoothing torque is arranged to at least partially cancel out a variation in torque output generated by the first and second working cycles, and (c) select a magnitude of the smoothing torque based on fuel efficiency and further based on whether the smoothing torque brings NVH generated by the operation of the engine below a predefined NVH target level.

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