Method and device for operating a power steering system

A power steering and operation control technology, applied in power steering mechanism, steering mechanism, electric steering mechanism, etc., can solve the problems of electric motor overheating, overheating, free vibration of power steering mechanism, etc.

Active Publication Date: 2018-03-27
ROBERT BOSCH AUTOMOTIVE STEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the driver's injuries can be reduced; however, the relatively high frequency has the effect that the actually relatively high and therefore inert mass of the power steering system cannot vibrat...

Method used

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  • Method and device for operating a power steering system
  • Method and device for operating a power steering system
  • Method and device for operating a power steering system

Examples

Experimental program
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Embodiment Construction

[0022] figure 1 The structure of a power steering system 10 for a motor vehicle is shown schematically. The power steering has in particular a steering handle 12 designed as a steering wheel, an electric motor 16 and a superposition unit 14 which superimposes a motor torque 26 applied by the electric motor 16 to a predetermined manual torque 24 . The superposition unit 14 is realized here by a superposition gear, which at the output provides the resultant acting torque 28 for the actual steering gear, which comprises, for example, a toothed rack 18 into which the steering pinion meshes. in the article. The displacement of the rack ultimately leads to a deflection of the articulated wheel 20 .

[0023] To actuate the electric motor 16 , a device designed as a controller 22 is arranged which generates an operating control signal S or supplies a corresponding motor current during normal driving operation.

[0024] In order to effectively prevent freezing of the electric motor ...

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PUM

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Abstract

The invention relates to a method and to devices for operating a power steering system (10) of a motor vehicle, wherein a motor torque (26) applied by an electric motor (16) is superposed on a specified manual torque (24) in a superposing unit (14), wherein a beginning freezing of the power steering system (10) is detected by means of suitable measures, such as an evaluation of rotational speed patterns of the electric motor (16), and wherein the electric motor (16) is controlled by means of an oscillating control signal in order to avoid the freezing of the power steering system (10), wherebyan oscillating application of a shaking torque (26*) to the power steering system (10) is effected, which shaking torque is applied by the electric motor (16). According to the invention, instead ofan oscillating control signal (S#) that has a uniform amplitude (a0) that acts in continuous time spans (T0), a control signal (S*) that has first time spans (T1) in which the control signal (S*) hasan increased amplitude (a1) and second time spans (T2) in which the control signal (S*) has no amplitude or a reduced amplitude (a2) is now generated, whereby the shaking torque (26*) applied by the electric motor (16) can be produced with an increased maximum torque (M*) in the first time spans (T1), without thermal overloading of the electric motor (16).

Description

technical field [0001] The invention relates to a method for operating a power steering system and a device for carrying out the method. Background technique [0002] In power steering systems of motor vehicles, a motor torque is usually superimposed by means of an electric motor on a manual torque applied by the driver. This superimposition is usually carried out by means of a superposition unit in the form of a superposition gear. Since power steering is generally used outdoors, it is exposed to external influences, in particular environmental influences and temperature influences. As a result, the functional effectiveness of the steering mechanism can be impaired. In particular, a possible freezing of the power steering due to ingress of water presents a particular problem here. [0003] Methods are known by which freezing of the power steering system is detected and countermeasures are taken. DE 10 2010 002 803 A1 discloses a method for operating a power steering sys...

Claims

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Application Information

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IPC IPC(8): B62D5/04
CPCB62D5/0481B62D5/0409B62D5/046
Inventor W.洛伊特纳V.法斯特R.韦格尔
Owner ROBERT BOSCH AUTOMOTIVE STEERING
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