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The Application of a Vibration Cancellation System to a Variable Displacement Engine Disclosure Number: IPCOM000007400D
Publication Date: 2002-Mar-21

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The Prior Art Database


Variable Displacement Engines (VDEs) are being developed and manufactured for purposes of increasing automotive fuel economy. In VDEs, a subset of cylinders are deactivated during low power demand conditions such as idle, part throttle or steady state speeds. During high power demand conditions the subset of cylinders are reactivated and the VDE then operates on all cylinders. While the VDE is both at idle and in cylinder deactivation mode, alternating powerplant excitations may be at their highest levels. For standards of Noise, Vibration and Harshness (NVH) it is desired that vehicle occupants, especially the driver not notice when the VDE has changed (or is in transition between) operating modes. The VCS is designed to cancel or minimize excitations that could be felt by the driver or other vehicle occupants of those vehicles equipped with VDEs.