Method for detecting internal friction in a steering system

一种电动转向系统、内摩擦的技术，应用在转向机构、动力转向机构、车辆转向/颠簸性能等方向，能够解决计算和储存能力有限等问题，达到易于应用和适应、避免错误警告的效果

Active Publication Date: 2010-12-01
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is very disadvantageous because the central control unit has limited computing and storage capacity for solving friction detection problems

Method used

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  • Method for detecting internal friction in a steering system
  • Method for detecting internal friction in a steering system

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Embodiment Construction

[0023] The method of the present invention starts at starting block 1 . In box 2, the limit value for the variation of the steering column torque (relative to the variation for steady straight driving at 0 Nm manual torque) is defined. The limit value depends on the configuration of the vehicle. The absolute limit value is higher for a vehicle with a sporty tune than for a vehicle with a comfort tune. Of course this is just an example. In block 2 it is also possible to define limit values ​​for the change in position of the steering rack. On the steering wheel, this limit value can have, for example, a rotation angle with an absolute value of 1°. This means that the limit value is exceeded if the steering rack moves more than 1° from its previous position due to the steering column torque. Limit values ​​are defined and maintained once. Of course, the above-mentioned absolute limit values ​​are only exemplary and should not limit the present invention.

[0024] In box 3 ...

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PUM

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Abstract

A method for detecting internal friction in an electric steering system of a motor vehicle having a control unit. The method comprises: defining a limiting value for a change in a steering column torque; defining a limiting value for a change in a steering rack position; measuring an actual steering column torque; measuring an actual change in a steering rack position; and generating a fault message if the actual steering column torque exceeds the limiting value for the change in a steering column torque and if an actual change in steering rack position is less than or equal to the limiting value for a change in a steering rack position.

Description

technical field [0001] The invention relates to a method for detecting internal friction in an electric steering system of a motor vehicle having a control unit. Background technique [0002] Electric power steering is also known as Electric Power Assisted Steering (EPAS). Over time, EPAS systems may have increased friction values ​​(aka internal friction), especially in the steering rack area, pinion and steering column. Internal friction can arise, for example, as a result of penetrating water and / or dirt, but also as a result of mechanical damage to the active elements. Too high an absolute friction value puts the safety performance of the steering system at risk. Therefore, if such a reduction in initial system performance is detected, the driver of the vehicle must be warned early in order to initiate repair and / or maintenance. [0003] EPAS systems typically have sensors, however, which are not suitable for directly detecting the friction described above. For this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/02G01L5/00
CPCB62D5/0481G01M17/06
Inventor 克劳斯·舒斯特瑞奇
Owner FORD GLOBAL TECH LLC
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