Braking systems for autonomous vehicles

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By adopting a hybrid system topology in the braking system of some autonomous vehicles and using hydraulic and electromechanical actuators, the problem of insufficient functionality of the secondary brake adjustment system is solved, and higher automated driving capabilities and faster deceleration are achieved.

CN115195683BActive Publication Date: 2025-03-18AUDI AG

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Patent Information

Application Number: CN202210356410.4
Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner
Priority Date: 2021-04-06
Filing Date: 2022-03-30
Publication Date: 2025-03-18
Estimated Expiration: 2042-03-30

Application Information

Patent Timeline

06 Apr 2021

Priority

30 Mar 2022

Application

CN202210356410.4

18 Mar 2025

Publication

CN115195683B

IPC: B60T13/12; B60T13/74; B60T8/17; B60T8/171; B60T8/172; B60T8/26; B60T8/32

CPC: B60T13/74; B60T13/741; B60T13/745; B60T13/12; B60T8/17; B60T8/171; B60T8/172; B60T8/26

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Application Domain

Braking action transmission Automatic initiations

Technical Efficacy Phrases

avoid leaning Reduce clamping force

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AI Technical Summary

Technical Problem

The braking system, the brake system in some autonomous vehicles, has low functionality, limiting the vehicle's automated driving ability and maximum speed in the event of failure.

Method used

A hybrid system topology is adopted, with the front axle using hydraulic actuators and the rear axle using electromechanical actuators. Both belong to the main and secondary braking adjustment systems to ensure redundant signal transmission and components networking.

Benefits of technology

The functionality of the secondary brake adjustment system is improved, faster deceleration and higher lateral stability in the case of failure, and the transmission-dependent structure of the parking lock is eliminated, which improves dynamic characteristics.

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Abstract

The invention relates to a braking system in an at least partially autonomous vehicle, which has a wheel brake (1) and a main brake control system (BRS1) and a redundant secondary brake control system (BRS2) for each wheel, wherein a hydraulic actuator (8, 10) is provided for each wheel in a first axle, in particular the front axle (VA), for actuating the vehicle brake (1), said hydraulic actuator being assigned both to the main brake control system (BRS1) and to the secondary brake control system (BRS2). According to the invention, an electromechanical, i.e. non-hydraulic operating main actuator (3) and an electromechanical, i.e. non-hydraulic operating secondary actuator (5) are provided for each wheel in a second axle, in particular the rear axle (HA). The main actuator is assigned to the main brake control system (BRS1) and the secondary actuator is assigned to the secondary brake control system (BRS2).

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