Brake-By-Wire Torque Balancing for Yaw Rate Mitigation

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Solution Overview

Problem

Brake-by-wire systems face challenges in maintaining vehicle stability during braking events due to unexpected differential braking torque between sides, particularly in cases of system failures, leading to increased yaw rates and potential loss of braking force.

Innovation Solution

A braking stability module that independently activates and deactivates brake circuits, adjusting torque differentials and modulating braking force based on vehicle handling characteristics and dynamic state parameters to mitigate yaw rate and maintain stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If brake-by-wire systems are used for electronic deceleration, then braking control precision and adaptability are improved, but system reliability deteriorates due to lack of mechanical backup and potential wheel-level failures

Engineering Contradiction:

Improvebraking control precisionVSAvoidsystem reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The braking system is divided into multiple independent brake circuits (first brake circuit and second brake circuit) that can operate independently. Each circuit controls brake torque at different wheels, allowing the system to segment braking functions to maintain reliability while achieving precise control through electronic management of each circuit's contribution to overall deceleration.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The brake control system dynamically adjusts brake torque distribution among different circuits and wheels based on real-time vehicle state parameters and handling characteristics. The system transitions between different braking configurations (full operation, partial deactivation) to adapt to failure conditions while maintaining optimal braking performance and stability.

Inventive Principle:

Principle #15Dynamics

2Productivity

If differential brake torque is applied during failure events, then deceleration efficiency is improved by utilizing available brake circuits, but vehicle stability deteriorates due to increased yaw rate

Engineering Contradiction:

Improvedeceleration efficiencyVSAvoidvehicle stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The system applies different brake torque levels to different wheels based on their individual circuit status and contribution to vehicle stability. Brake torque at each wheel is independently controlled to maximize deceleration from available circuits while compensating for differential torque effects that would otherwise cause yaw rate increases and stability degradation.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The control system continuously adjusts brake torque parameters across different circuits based on detected vehicle state parameters (speed, acceleration, steering angle) and permanent handling characteristics. This dynamic parameter adjustment allows the system to optimize the balance between deceleration efficiency and stability by modifying torque distribution in response to changing operating conditions.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If brake circuits are independently controlled, then braking adaptability is improved for failure mitigation, but device complexity increases

Engineering Contradiction:

Improvebraking adaptabilityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The brake control system performs multiple functions through a unified electronic control architecture: it manages normal braking operations, detects circuit failures, mitigates differential torque effects, and maintains vehicle stability. This multi-functionality reduces the need for separate mechanical backup systems while achieving comprehensive braking adaptability across different operating and failure conditions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12600333B2Differential braking and yaw rate mitigation during brake-by-wire braking events with increased deceleration during failure events

Publication Date: 2026.04.14 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

A braking system includes: brake circuits independently activated and deactivated and when activated apply braking force at respective wheels; a braking stability module detecting an issue or a failure with a first one of the brake circuits where an unexpected amount of braking torque is being applied as compared to an amount of braking torque applied at a second one of the brake circuits, and mitigating effect of the unexpected amount of braking torque on a yaw rate of the vehicle by i) adjusting the braking torque of the first one of the brake circuits, ii) adjusting braking torque of the second one of the brake circuits, and/or iii) deactivating the first one of the brake circuits and modulating braking torque of the second one of the brake circuits, to compensate for the unexpected amount of braking torque.