Method for reducing chatter vibrations in a drivetrain

Patent metadata

Field	Value
Publication number	US-9624991-B2
Application number	US-201314391619-A
Country	US
Kind code	B2
Filing date	Mar 18, 2013
Priority date	Apr 11, 2012
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A method is provided for reducing chatter vibrations in a motor vehicle drivetrain having a drive unit, a vehicle transmission and an automated friction clutch, wherein a vibration absorber is emulated by an appropriate operation of the friction clutch in order to improve the method.

First claim

What is claimed is:

1. A method for emulating a vibration absorber by reducing chatter vibrations in a motor vehicle drivetrain having a drive unit, a vehicle transmission, and an automated friction clutch, the method comprising the steps of:
receiving an input signal from at least one sensor;
determining, using a plurality of interconnected linear control elements, a transfer function;
determining, using the input signal and the transfer function, an output signal to modulate a target clutch torque; and,
sending the output signal to the automated friction clutch to modulate clutch torque.

2. The method of claim 1 , wherein the transfer function comprises a maximum value in the vicinity of a resonant frequency of the motor vehicle drivetrain.

3. The method of claim 2 , wherein the transfer function has a phase shift.

4. The method of claim 3 , wherein the phase shift is adaptable.

5. The method of claim 2 , further comprising the step of adjusting a rise or drop from the maximum.

6. The method of claim 1 , further comprising the step of filtering, using a high pass filter, the input signal to suppress low-frequency components while emulating the vibration absorber.

7. The method of claim 1 , further comprising the step of amplifying the input signal wherein amplification is carried out when emulating the vibration absorber.

8. The method of claim 1 , wherein the linear control elements are each parameterizable separately.

9. The method of claim 1 , wherein a signal of a transmission input shaft rotation speed is fed to the transfer function for emulating the vibration absorber as an input value, and the transfer function delivers a signal for modulating a clutch torque request as an output value.

Assignees

• Schaeffler Technologies Gmbh & Co Kg
• Schaeffler Technologies Ag

Inventors

• Neuberth Ulrich
• Reuschel Michael

Classifications

• F16D2500/50293

  Reduction of vibrations · CPC title

• F16F15/10

  Suppression of vibrations in rotating systems by making use of members moving with the system (by balancing F16F15/22 {; yielding couplings F16D3/00} ; with flywheels acting variably or intermittently F16H {; construction providing resilience or vibration-damping for gear elements F16H55/14}) · CPC title

• F16D2500/30816

  Speed of the input shaft · CPC title

• F16D2500/70689

  using maximum or minimum values · CPC title

• F16D2500/1045

  Friction clutch · CPC title