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Power steering system with ball screw

A technology of power steering and ball screw, which is applied in the direction of electric steering mechanism, etc.

Active 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

Known methods for detecting friction thus lead to unnecessary replacement of steering gears that are still functional

Method used

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  • Power steering system with ball screw

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Embodiment Construction

[0019] figure 1 Only a motor vehicle 1 with wheels 2 is shown schematically, two of which can be oriented by a steering gear 6 for steering. The steering gear 6 is here implemented as a ball screw. For this purpose, the driver of the motor vehicle 1 communicates the steering request through the steering wheel 3. The difference between the deflection angle of the steering wheel 3 and the actual deflection angle of the steering gear 6 can be determined by means of a suitable sensor, such as a torsion bar 4 connecting the steering wheel 3 to the steering rack 10. The control unit 7 controls the electric motor 5 which is arranged on the steering rack 10 and functions as an electric assist motor in such a way that the deviation between the deflection angle of the steering wheel 3 and the deflection angle of the steering gear 6 is cancelled. The steering rack 10 driven by the electric motor 5 then drives the steering gear 6 so that the steering gear 6 orients the wheels 2 according...

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Abstract

The present invention introduces an electrically assisted power steering system with a ball screw having sensors placed in the steering system. The sensor is designed to detect acoustic vibrations or acceleration signals in the steering system during a change in steering angle, to generate a sensor signal representing the vibration or acceleration signal, and to transmit the sensor signal to a control unit. In the context of the invention, the control unit is designed to compare the sensor signal with a threshold value and to detect a fault state when the sensor signal is greater than the threshold value. The invention likewise relates to a motor vehicle having a power steering system according to the invention.

Description

Technical field [0001] The invention relates to an improved electric auxiliary power steering system with a ball screw and a motor vehicle with the power steering system. Background technique [0002] In rack and pinion steering systems, it is possible that the damaged housing allows moisture and dust to enter the steering gear, causing undesirable rust to begin to form. In hydraulic steering gears, long-term damage can occur to the seals, with the result that the steering oil leaks. This results in the driver being no longer assisted during steering, which is a clear indication of a defect in the steering system. [0003] Power steering systems with ball screws-also known as rack-and-pinion power assisted steering (REPAS)-use electric assist, and the result is that the possibility of steering oil leakage is eliminated. However, there is still a problem of rust generation in the steering system at this time, especially on the ball raceway of the steering rack, the ball of the rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62D5/04
Inventor 弗兰克·皮特·恩格斯
Owner FORD GLOBAL TECH LLC
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