Gm Global Technolgoy Operations, Inc.

Scott C Mrdeza

Xiaofeng Mao

William R Cawthorne

Eric Edward Krueger

Brandon C Pennala

R Travis Schwenke

Hai Xu

Michael C Roberts

Jeffrey N Heaton

Thomas A Klingler

Dennis M Reich

An active damping system for a driveline includes a prop shaft configured to transmit engine power from an engine to a load, a sealed damper housing, and an active damping fluid contained within the sealed damper housing. A viscosity of the active damping fluid is changeable based on a torsional vibration of the prop shaft. The active damping system further includes a piston fixed to a side of the prop shaft and in communication with the active damping fluid. The piston is configured to rotate about an axis of the prop shaft. The system further includes a viscosity changing unit in communication with the active damping fluid, and a controller operatively connected to the viscosity changing unit. The controller is configured to cause the viscosity changing unit to change a viscosity of the active damping fluid. The viscosity of the active damping fluid changes the torsional vibration.

Active damper for torsional vibration and noise mitigation in a driveline

An exemplary method to disengage a brake transmission shift interlock feature of a vehicle includes the steps of receiving vehicle characteristic data from at least one vehicle sensor, determining a current road grade, determining a vehicle brake pressure target, receiving vehicle brake pressure data from at least one vehicle sensor, and generating a control signal to disengage the brake transmission shift interlock feature if the vehicle brake pressure reaches the vehicle brake pressure target.

Systems and methods for parking pawl disengagement

A brake pedal emulator for a brake-by-wire system of a vehicle extends and connects between a support structure and a brake pedal operatively engaged to the support structure. The brake pedal emulator includes a hydraulic cylinder having a magneto-rheological hydraulic fluid and an electrical element configured to carry an electrical current for controlling a viscosity of the magneto-rheological hydraulic fluid and thereby controlling a first force exerted by the hydraulic cylinder when actuated by the brake pedal.

Brake pedal emulator of a brake-by-wire system and method of operation

A powertrain includes a propulsion system having first and second torque sources, and first and second drive axles respectively connected to and independently driven by the first and second torque sources. A permissible range of torque contribution from the torque sources to the respective first and second drive axles is defined by a component torque window. The powertrain includes sensors for detecting a dynamic driving maneuver of a vehicle having the powertrain. A controller executes a method to adjust a size and/or orientation of a chassis torque window during the detected dynamic driving maneuver, determine an optimally efficient axle torque operating point that falls on a torque line within the component torque window in proximity to the chassis torque window, and command the torque contribution via transmission of torque control signals to the first and second torque sources to achieve the optimally efficient axle torque operating point.

Powertrain and method of coordinating chassis and propulsion system torque limits

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Lennon, MI, United States of America

Scott C Mrdeza