Method for operating a steering system

Patent metadata

Field	Value
Publication number	US-2020298902-A1
Application number	US-201816649479-A
Country	US
Kind code	A1
Filing date	Sep 17, 2018
Priority date	Sep 20, 2017
Publication date	Sep 24, 2020
Grant date	—

Abstract

A method is proposed for operating a steering system of a motor vehicle, in particular an electromechanically supported steering system. First, at least one first virtual magnet and one second virtual magnet are provided in the steering system of the motor vehicle. A virtual magnetic force exerted on each other by the multiple virtual magnets is determined. A setpoint force that is to be applied to a lower part of the steering system is estimated and an auxiliary force with which a servo motor of the steering system acts on the lower part of the steering system is determined from the specified virtual magnetic force and the estimated setpoint force.

First claim

1 . A method for operating a steering system of a motor vehicle, in particular an electromechanically supported steering system, with the following steps:
provide for at least one first and one second virtual magnet in the steering system of the motor vehicle; determine a virtual magnetic force that the multiple virtual magnets exert on each other; estimate a setpoint force to be applied to a lower part of the steering system; and determine an auxiliary force exerted on the lower part of the steering system by a servo motor from the determined virtual magnetic force and the estimated setpoint force.

2 . The method as claimed in claim 1 , the first virtual magnet is provided at a fixed position in the steering system.

3 . The method as claimed in claim 1 , wherein the second virtual magnet is provided at a variable position in the steering system.

4 . The method as claimed in claim 3 , wherein the variable position of the second virtual magnet is determined based on operating parameters of the motor vehicle, in particular of the steering system.

5 . The method as claimed in claim 1 , wherein a virtual electromagnet is used as the first virtual magnet.

6 . The method as claimed in claim 1 , wherein a virtual electromagnet is used as the second virtual magnet.

7 . (canceled)

8 . The method as claimed in claim 1 , wherein a permanent magnet is used as the second virtual magnet.

9 . The method as claimed in claim 1 , wherein magnetic properties of the first virtual magnet are determined based on operating parameters of the motor vehicle, in particular of the steering system.

10 . The method as claimed in claim 1 , wherein the first virtual magnet and the second virtual magnet are assigned to a common wheel of the vehicle.

11 . The method as claimed in claim 1 , wherein the first virtual magnet is provided on a steering gear and that the second virtual magnet is provided on a track rod.

12 . The method as claimed in claim 1 , wherein the first virtual magnet is provided on the steering gear and that the second virtual magnet is provided on a rack.

13 . The method as claimed in claim 1 , wherein the first virtual magnet is provided spaced apart from a wheel assigned to it relative to the longitudinal direction of the motor vehicle, wherein the first virtual magnet is at essentially the same transverse distance from the longitudinal axis of the motor vehicle as the center of the wheel, and wherein the second virtual magnet is provided essentially at the center of the wheel.

Assignees

• Zf Automotive Germany Gmbh

Inventors

• Bergmann Philipp

Classifications

• B62D5/0466

  for returning the steering wheel to neutral position · CPC title

• B62D3/126

  characterised by the rack · CPC title

• B62D5/005

  means for generating torque on steering wheel or input member, e.g. feedback · CPC title

• B62D5/0469 Primary

  End-of-stroke control · CPC title

• B62D5/0421

  Electric motor acting on or near steering gear · CPC title