Active damper for torsional vibration and noise mitigation in a driveline

Patent metadata

Field	Value
Publication number	US-10274040-B2
Application number	US-201715481040-A
Country	US
Kind code	B2
Filing date	Apr 6, 2017
Priority date	Apr 6, 2017
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

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.

First claim

What is claimed is:

1. An active damping system for a driveline comprising:
a prop shaft configured to transmit engine power from an engine to a load;
a hydraulic actuator configured to communicate hydraulic force to an inertia gear via a hydraulic fluid acting on one or more damping pads; and
a controller operatively connected to the hydraulic actuator, wherein the controller is configured to change a torsional vibration of the prop shaft by altering a rotational speed of the inertia gear.

2. The active damping system of claim 1 , wherein the controller is configured to:
determine a vehicle speed; and
alter the rotational speed of the inertia gear via the hydraulic actuator based on the vehicle speed.

3. The active damping system of claim 1 , wherein the controller is configured to:
determine an engine speed; and
alter the rotational speed of the inertia gear via the hydraulic actuator based on the engine speed.

4. The active damping system of claim 1 , further comprising a non-rotary housing in which the inertia gear and the one or more damping pads are mounted.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Mao Xiaofeng
• Xu Hai
• Heaton Jeffrey N
• Mrdeza Scott C

Classifications

• F16F2224/045

  magnetorheological · CPC title

• F16F2232/02

  Rotary · CPC title

• F16F15/173

  provided within a closed housing {(F16F15/36 takes precedence)} · CPC title

• F16F15/18

  using electric, {magnetic or electromagnetic} means ({suppression of vibrations of rotating systems by use of non-rotating magnetic or electromagnetic means F16F15/03;} dynamo-electric devices H02K; {control effected upon generator excitation circuit to reduce harmful effects of overloads or transients H02P9/10}) · CPC title

• F16F2222/08

  Inertia · CPC title