Controlling a drive system for at least one axle of a motor vehicle

Patent metadata

Field	Value
Publication number	US-10696176-B2
Application number	US-201816199309-A
Country	US
Kind code	B2
Filing date	Nov 26, 2018
Priority date	Nov 28, 2017
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A drive system for at least one axle of a motor vehicle can be controlled, wherein the drive system has at least one electrical machine as drive unit, a drive shaft which is driven by the drive unit, a first output shaft and optionally a second output shaft and also a first clutch which connects the drive shaft to the first output shaft and optionally a second clutch which connects the drive shaft to the second output shaft, and furthermore a control unit for controlling the drive unit and the clutches, wherein the first output shaft and the optional second output shaft are arranged on a common axle.

First claim

The invention claimed is:

1. Method for controlling a drive system for at least one axle of a motor vehicle, wherein the drive system has at least one electrical machine as drive unit, a drive shaft which is driven by the drive unit, a first output shaft and also a first clutch which connects the drive shaft to the first output shaft, and a control unit, wherein the method comprises at least the following steps:
a) determining a desired change in a drive torque which is provided at least by the electrical machine;
b) predicting vibratory excitation resulting from a change in the drive torque;
c) adjusting the drive torque to be introduced based on a reduction in a time response of the drive system and the predicted vibratory excitation;
d) introducing the adjusted drive torque starting at least from the drive unit into the drive shaft.

2. The method of claim 1 , wherein the drive system comprises a second output shaft and a second clutch which connects the drive shaft to the second output shaft, wherein the first output shaft and the second output shaft are arranged on a common axle connecting two wheels.

3. The method of claim 2 , wherein a transmission behavior of the two clutches in respect of the splitting and transmission of the drive torque to the output shafts is taken into account.

4. The method of claim 3 , wherein a limit value for a maximum permissible slip is defined for the two clutches in each case; wherein the adjustment factor is selected such that the limit value is permanently undershot.

5. Method for controlling a drive system for at least one axle of a motor vehicle, wherein the drive system has at least one electrical machine as drive unit, a drive shaft which is driven by the drive unit, a first output shaft and a second output shaft and also a first clutch which connects the drive shaft to the first output shaft and a second clutch which connects the drive shaft to the second output shaft, and furthermore a control unit for controlling the drive unit and the clutches, wherein the first output shaft and the second output shaft are arranged on a common axle, wherein the method comprises at least the following steps:
1) determining a desired change in a drive torque which is provided at least by the electrical machine;
2) detecting vibratory excitation resulting from the change in the drive torque which has already taken place;
3) calculating an opposing vibration for influencing the provided drive torque;
4) introducing the opposing vibration;
wherein a transmission behavior of the two clutches in respect of the splitting and transmission of the drive torque to the output shafts is taken into account.

6. A motor vehicle, at least having a drive system for at least one axle of the motor vehicle, wherein the drive system has at least one electrical machine as drive unit, a drive shaft which is driven by the drive unit, a first output shaft and also a first clutch which connects the drive shaft to the first output shaft, and furthermore a control unit for controlling the drive unit and at least the first clutch, wherein the control unit is configured to carry out a first method or a second method, the first method comprising:
a) determining a desired change in a drive torque which is provided at least by the electrical machine;
b) predicting vibratory excitation resulting from a change in the drive torque;
c) adjusting the drive torque to be introduced based on a reduction in a time response of the drive system and the predicted vibratory excitation; and
d) introducing the drive torque, which is changed by the adjustment factor, starting at least from the drive unit into the drive shaft;

the second method comprising:
1) determining a desired change in a drive torque which is provided at least by the electrical machine;
2) detecting vibratory excitation resulting from the change in the drive torque which has already taken place;
3) calculating an opposing vibration for influencing the provided drive torque;
4) introducing the opposing vibration;
wherein a transmission behavior of the two clutches in respect of the splitting and transmission of the drive torque to the output shafts is taken into account.

Assignees

• Gkn Automotive Ltd

Inventors

• Ruiters Volker-René
• Sontheim Florian
• Fitz Rudolf
• Blaj Emanuel
• Kaiser Gerd
• Cordero Enrique

Classifications

• Y02T10/72

  Electric energy management in electromobility · CPC title

• Y02T10/64

  Electric machine technologies in electromobility · CPC title

• B60W2510/084

  Torque change rate · CPC title

• B60W2030/203

  related or induced by the clutch · CPC title

• B60W2720/406

  between left and right wheel · CPC title