Steer-by-Wire Control Redundancy Through Shared Steering Data

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Solution Overview

Problem

Steer-by-wire (SbW) steering systems lack redundancy in steering control information, necessitating a design that ensures safety and functionality even in the event of failures within the control modules.

Innovation Solution

A steering control system and method that shares steering control information between multiple control modules through communication channels, allowing one module to take over from another in case of failure, ensuring continuous operation of the steering motor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single control module is used to control the steering motor, then the device complexity is reduced, but the reliability decreases due to lack of redundancy

Engineering Contradiction:

Improvesteering control reliabilityVSAvoidcontrol module structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control system is divided into multiple independent control modules (first control module and second control module), each capable of independently generating steering control information. This segmentation allows redundancy while maintaining manageable complexity through modular design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system changes the operational state parameters of the control modules by switching between normal dual-module operation and fail-operational modes. When a failure is detected, the system transitions to using only the functional module, adjusting operational parameters to maintain reliability without requiring complete system redesign.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If multiple control modules are implemented for redundancy, then the reliability improves, but the device complexity increases

Engineering Contradiction:

Improvesteering control reliabilityVSAvoidcontrol module structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Multiple control modules are merged into a unified control system with shared communication channels and coordinated operation. The first and second control modules work together through CAN communication, merging their capabilities to achieve high reliability while managing complexity through integration.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Each control module is designed with universal functionality to perform both normal steering control and fail-operational steering control. The modules can interchange roles and functions depending on operational status, reducing the need for specialized components and managing overall system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If communication channels are added between control modules, then the adaptability improves for failure scenarios, but the device complexity increases

Engineering Contradiction:

Improvefailure response capabilityVSAvoidcommunication structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

A CAN communication channel serves as an intermediary between control modules and other vehicle systems. This standardized communication interface enables information sharing and coordinated failure response without requiring complex direct connections between all system components.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12559167B2Steering control system and method for safe driving

Publication Date: 2026.02.24 HL MANDO CORP

AI summary

A steering control system and method for safe driving may control steering of a vehicle by sharing steering control information between control modules of the plurality of steering control devices through a communication channel even when abnormality such as a failure or fault occurs in one or some control modules included in the plurality of steering control devices.