Gm Global Technolgoy Operations, Inc.

Mark A Gehringer

Wallace J Hill

Michael J Grimmer

Eric J Defenderfer

Stephen H Miller

Dennis J Kinchen

Frank C Valeri

Michael McGuire

Darrell Lee Robinette

Timothy J Roggenkamp

Nitish J Wagh

Paul A Piorkowski

Stephanie A Erntser

Stephanie A Ernster

Daniel Robert Mandernack

A method for noise cancellation includes monitoring a system for a current operating point, monitoring the system for a predetermined disturbance, and in response to the predetermined disturbance, determining the disturbance to be in one of a transient or steady state response period. A set of data is selected corresponding to the current operating point of the system, the disturbance, and the response period from a database containing predetermined noise cancellation waveform data. A noise cancelling waveform is output to audio transducers based upon the selected set of data.

Automotive noise mitigation

A system includes a stationary component, a rotating component arranged adjacent the stationary component, and a planetary torsional vibration absorber system mounted between the stationary component and the rotating component. The planetary torsional vibration absorber system includes a planetary gear system including a ring gear, a sun gear and a carrier. At least one of the ring gear, the sun gear and the carrier is rotationally fixed to the rotating component and another of the ring gear, the sun gear and the carrier is fixedly secured to the stationary component. A tuned vibration absorber including a tunable damping and stiffness component and an inertia ring is mounted to yet another of the ring gear, the sun gear and the carrier.

Planetary torsional vibration absorber system for a vehicle

A selectively tunable vibration absorber includes a support member having an outer surface, and a selectively tunable element mounted relative to the outer surface of the support member. The selectively tunable element is selectively adjustable to attenuate vibrations in a selected frequency range perceived by the support member in a selected direction. A mass is supported by the selectively tunable element.

Selectively tunable vibration absorber for a vehicle

A vehicle includes a chassis, and a drivetrain supported by the chassis. The drivetrain includes a prime mover and a transmission mechanically linked to the prime mover. At least one dynamically adjustable engine mount connects the drivetrain to the chassis. The at least one dynamically adjustable engine mount includes a selectively adjustable parameter. One or more sensors is associated with the vehicle. The one or more sensors is operable to detect one or more vehicle parameters. A control system is operatively connected to the at least one dynamically adjustable engine mount and the one or more sensors. The control system is operable to alter the selectively adjustable parameter of the at least one dynamically adjustable mount to substantially isolate the chassis from lateral shudder of the drivetrain in response to the one or more vehicle parameters.

Dynamically adjustable engine mounts for a motor vehicle

A vehicle includes a chassis and a vehicle body supported by the chassis. At least one dynamically adjustable body mount connects the vehicle body to the chassis. The at least one dynamically adjustable body mount includes a selectively adjustable parameter. One or more vehicle sensors is associated with the vehicle. The one or more vehicle sensors is operable to detect one or more vehicle parameters. A control system is operatively connected to the at least one dynamically adjustable body mount and the one or more vehicle sensors. The control system is operable to alter the selectively adjustable parameter of the at least one dynamically adjustable body mount to substantially isolate the body from road and vehicle induced vibration in response to at least one of the one or more vehicle parameters and the one or more road surface parameters.

Dynamically adjustable body mounts for a motor vehicle

A two-stage stiffness driveshaft includes a hollow cylinder having first and second ends and a hollow cylinder stiffness. An inner shaft having first and second ends and an inner shaft stiffness extends through the hollow cylinder. The inner shaft's first end and the hollow cylinder's first end are engaged via a rotational clearance fit. The inner shaft's second end is rotationally fixed to the hollow cylinder's second end to permit the inner shaft's first end to twist through a predetermined angle relative to the inner shaft's second end. The inner shaft's stiffness defines the driveshaft's first-stage stiffness, while the combined stiffness of the inner shaft and the hollow cylinder defines the driveshaft's second-stage stiffness. A damping element positioned between the inner shaft and the hollow cylinder controls variation in torque transmitted by the driveshaft and generates gradual transition between the first-stage stiffness and the second-stage stiffness.

Driveshaft with two-stage stiffness

A two-stage stiffness driveshaft includes a hollow cylinder defined by a longitudinal axis, a first end, a distal second end, and a hollow cylinder stiffness. The driveshaft also includes an inner shaft extending through the hollow cylinder along the longitudinal axis and defined by a first end, a distal second end, and an inner shaft stiffness. The first end of the inner shaft is engaged with the first end of the hollow cylinder via a rotational clearance fit. The second end of the inner shaft is rotationally fixed to the second end of the hollow cylinder such that the first end of the inner shaft can twist to a predetermined angle with respect to the second end of the inner shaft. The inner shaft stiffness defines a first-stage stiffness of the driveshaft, and the inner shaft stiffness and the hollow cylinder stiffness together define a second-stage stiffness of the driveshaft.

A system according to the principles of the present disclosure includes a vibration level module and an engine operation control module. The vibration level module estimates a first level of vibration in a vehicle due to contact between tires of the vehicle and a road surface as the vehicle travels over the road surface. The vibration level module estimates a second level of vibration in the vehicle due to an engine in the vehicle. The engine operation control module selectively adjusts at least one of a speed of the engine and a load on the engine when the second vibration level is less than the first vibration level.

System and method for adjusting engine speed and/or engine load to improve fuel economy without causing vehicle vibration that is perceivable by a vehicle occupant

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Milford, MI, United States of America

Mark A Gehringer