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Methods for Identifying Increased Friction in Power Assisted Rack and Pinion Steering Systems

A technology of rack and pinion and steering system, which is applied in the direction of power steering mechanism, steering mechanism, mechanical steering gear, etc., and can solve the problem of distinguishing the friction that occurs in the steering mechanism on the one hand and the friction caused by the surface change of the road on the other hand. Problems in the wheel suspension system, expensive replacement of the steering system, misjudgment, etc.

Inactive Publication Date: 2018-10-26
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this purpose separate sensors can be used, but these increase the cost of the motor vehicle
Other known methods cannot reliably distinguish between friction occurring in the steering mechanism on the one hand and friction arising from changes in the surface of the roadway or in the wheel suspension system on the other hand
This would lead to a misjudgment leading to unnecessary costly replacement of the steering system

Method used

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  • Methods for Identifying Increased Friction in Power Assisted Rack and Pinion Steering Systems
  • Methods for Identifying Increased Friction in Power Assisted Rack and Pinion Steering Systems

Examples

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Embodiment Construction

[0030] figure 1 A motor vehicle 1 comprising an exemplary embodiment of a rack and pinion steering system according to the invention is shown. The motor vehicle 1 has four wheels 2-1 to 2-4, of which the first two wheels 2-1 and 2-2 are used to steer the motor vehicle 1 shown in the example. The driver communicates his steering intention using a steering wheel 3 whose steering column is connected via a gear 4 to a rack 5 . Setting the desired steering angle on the steering wheel 3 causes a corresponding rotation of the steering rod, and this rotation is transmitted via the pinion 4 to the rack 5 . As a result, the rack is pushed along its longitudinal axis and thus changes the set angle of the wheels 2-1 and 2-2. Since steering may require a large amount of force, power assistance is usually provided, which is provided by a servo motor 7 in this example. The servomotor 7 is likewise connected to the toothed rack 5 , the connection being realized via a steering mechanism 6 ,...

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PUM

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Abstract

The present invention relates to a method for identifying increased friction in a power assisted rack and pinion steering system. In the method, a detection current is applied to a servo motor (7) of a rack and pinion steering system, and a position change of a rotor of the servo motor (7) caused by the detection current applied to the servo motor (7) is detected. The detected change in position is then compared to a predetermined expected change in position. The friction state is determined from the comparison result. The invention also relates to a power assisted rack and pinion steering system comprising a servomotor (7) and a control unit (10) for carrying out the method according to the invention; also to a motor vehicle comprising Rack and pinion steering system.

Description

technical field [0001] The present invention relates to a method for identifying increased friction in a power assisted rack and pinion steering system, and to a power assisted rack and pinion steering system designed for identifying increased friction. Background technique [0002] A rack and pinion electric power steering (R-EPAS) system, that is to say a rack and pinion steering system with electric power assist, is a common type of steering system in motor vehicles. Increased internal friction can occur in the steering mechanism of such steering systems and this can have a negative effect on driving comfort and the steering behavior of the motor vehicle. In extreme cases, this can even lead to the fact that power assistance is no longer available to the driver, with the result that steering of the motor vehicle is extremely difficult and the motor vehicle no longer behaves in the manner to which the driver is accustomed. [0003] Increased friction in the steering mecha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62D3/12
CPCG01M17/06B62D5/0448B62D5/0481G01M13/021
Inventor 克劳斯·舒斯特瑞奇
Owner FORD GLOBAL TECH LLC