Brake-Based Steering Backup for Steer-By-Wire Failure

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Solution Overview

Problem

Steer-by-wire steering systems in vehicles lack mechanical connections between the steering wheel and wheels, leading to potential complete loss of steering performance if communication fails, which can cause accidents, and implementing redundancy systems increases costs.

Innovation Solution

Utilize a biased brake force to steer and compensate for driving torque in a host vehicle when the steering system fails, using a controller to calculate and apply biased brake torque to the braking system and driving system to maintain control and safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a redundancy system is installed to implement fail safety when steering system fails, then reliability is improved, but device complexity and cost increase

Engineering Contradiction:

Improvefail safetyVSAvoidredundancy system configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The braking system is designed to perform its primary function (vehicle deceleration) and a secondary function (steering assistance) when the steering system fails. By applying different brake torques to left and right wheels, the braking system can generate both deceleration force and steering moment, eliminating the need for separate redundancy steering actuators and reducing overall system complexity while maintaining fail-safe capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent replaces the need for mechanical redundancy steering actuators with a control system that utilizes the existing braking system's mechanical capability. The controller calculates and applies biased brake torque to the braking system to generate steering moment, substituting complex mechanical redundancy components with a simpler control-based approach that uses the braking system's inherent friction-based force generation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If biased brake torque is applied to steer the host vehicle when steering system fails, then reliability is improved, but longitudinal deceleration increases causing driver discomfort

Engineering Contradiction:

Improvesteering control during failureVSAvoidlongitudinal deceleration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The controller calculates compensating driving torque that acts as a counterbalance to the longitudinal deceleration caused by biased brake torque. By applying additional driving force through the driving system, the controller offsets the deceleration effect, maintaining more natural vehicle behavior and reducing driver discomfort while preserving the steering assistance function

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The controller dynamically adjusts the magnitude of biased brake torque and compensating driving torque based on real-time vehicle operating conditions including steering angle, vehicle speed, and brake pressure. This parameter adjustment ensures optimal steering assistance while minimizing unwanted longitudinal deceleration and driver discomfort across different driving scenarios

Inventive Principle:

Principle #35Parameter changes

3Reliability

If additional redundancy actuators are installed for steering failure, then reliability is improved, but manufacturing cost increases

Engineering Contradiction:

Improvesteering system redundancyVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The existing braking system serves itself by simultaneously performing deceleration and steering assistance functions. When steering system failure is detected, the controller utilizes the braking system's own capability to generate both longitudinal and lateral control forces, eliminating the need for separate redundancy components and reducing manufacturing costs

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20260014999A1Apparatus and method for assisting driving of host vehicle

Publication Date: 2026.01.15 HL MANDO CORP

AI summary

The present disclosure provides an apparatus for assisting driving of a host vehicle, including a first sensor configured to detect a first steering angle of a steering wheel of the host vehicle and a controller connected to the first sensor, wherein the controller is configured to, in response to a determination of a failure of a steering system of the host vehicle, steer the host vehicle with a biased brake torque and compensate for a driving torque of the host vehicle, that is reduced due to the biased brake torque.