Tula Technology, Inc.

Geoffrey Routledge

Louis Joseph Serrano

Vijay Srinivasan

Matthew Aaron Younkins

Mark A Shost

Mark A Wilcutts

Ying Ren

Biswa R Ghosh

Siamak Hashemi

Robert Scott Bailey

Systems and methods for reducing noise or vibration generated by an internal combustion engine are described. An engine controller is arranged to operate the working chambers of the engine in a cylinder output level modulation manner A noise/vibration reduction unit actively control of a device that is not a part of the powertrain. The device is controlled in a feed forward manner to alter an NVH characteristic of the vehicle in a desired manner based at least in part on a characteristic of the cylinder output level modulation operation of the engine.

Noise/vibration reduction control

Methods and controllers are described that facilitate the determination of an operational skip fire firing fraction for an engine based at least in part noise levels and/or vehicle vibration levels that are not induced by engine operation. In some embodiments, the firing fraction is determined based at least in part of noise or vibrations associated with road roughness and/or cabin noise levels.

Controller system and method for selecting a firing fraction for a skip fire controlled internal combustion engine based at least on non-drive train levels of noise, vibration and harshness

Systems and methods for reducing noise or vibration generated by an internal combustion engine are described. An engine controller is arranged to operate the working chambers of the engine in a cylinder output level modulation manner. A noise/vibration reduction unit actively control of a device that is not a part of the powertrain. The device is controlled in a feed forward manner to alter an NVH characteristic of the vehicle in a desired manner based at least in part on a characteristic of the cylinder output level modulation operation of the engine.

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Gilroy, CA, United States of America

Geoffrey Routledge