Method for operating a steer-by-wire steering system and steer-by-wire steering system

The SbW steering system's transition from a main to a redundant control path is improved by estimating and setting manipulated variables based on driving dynamics, addressing reliability and comfort issues by reducing torque gaps and ensuring system continuity.

WO2024260613A1PCT designated stage expired Publication Date: 2024-12-26VOLKSWAGEN AG
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Patent Information

Application Number
PCT/EP2024/061303
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-06-19
Filing Date
2024-04-24
Publication Date
2024-12-26

AI Technical Summary

Technical Problem

Steer-by-wire (SbW) steering systems require higher reliability than conventional systems due to the absence of a mechanical connection, necessitating robust error detection and redundancy to prevent complete system failure, especially with the integration of automated driving assistance systems.

Method used

The method involves a transition from a main control path to a redundant control path in a SbW steering system, where the redundant path is activated based on driving dynamics and steering gear measurements to estimate and set a manipulated variable, such as torque, during a transition phase, thereby reducing torque gaps and ensuring a smooth switch.

Benefits of technology

This approach enhances the reliability and comfort of the transition by providing immediate manipulated variables, avoiding extreme values, and gradually aligning the redundant control path with the main path's variables, ensuring continued system functionality and driver experience.

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Abstract

The invention relates to a method for operating a steer-by-wire steering system (1), wherein the steer-by-wire steering system (1) has redundantly designed control paths, wherein if an error occurs in a main control path, there is switching from the main control path to a redundant control path and for this purpose the redundant control path is switched from a passive state to an active state, wherein a control variable (20, 21) in the redundant control path is estimated during a predefined transition phase based on measurement variables (30) of driving dynamics and a steering transmission (11). The invention also relates to a steer-by-wire steering system (1).
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Citation Information

Patent Citations

  • Vehicle transverse control method and device, electronic equipment and computer program product

    CN115384490A

  • steering arrangement for motor vehicles

    DE10101827A1

  • Motor car, has sensor systems actuated by main control unit in nominal operating mode, and replacement control unit controlling sensor systems if mistake arises in main control unit in emergency operation state

    DE102013020177A1

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