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Cylinder deactivation torque limit for noise, vibration, and harshness

  • US 7,278,391 B1
  • Filed: 09/11/2006
  • Issued: 10/09/2007
  • Est. Priority Date: 09/11/2006
  • Status: Active Grant
First Claim
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1. An engine control system for controlling the engine to transition between an activated mode where all cylinders are active and a deactivated mode where less than all cylinders are active, comprising:

  • a noise vibration and harshness (NVH) limit module that determines a noise, vibration, and harshness (NVH) torque limit based on the engine speed and the vehicle speed; and

    a mode transition module that enables the engine to transition from the activated mode to the deactivated mode while limiting noise, vibration, and harshness based on a comparison of the NVH torque limit minus a hysteresis and a requested torque.

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