Brake Control Using One-Sided Wheel Braking for Steering Failures
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Solution Overview
Problem
Steer-by-wire systems for vehicles lack a function to prevent understeering and oversteering situations during system failures, which can cause vehicles to deviate from the ideal turning line, and there is no redundancy in steering system control to manage these conditions effectively.
Innovation Solution
A brake apparatus and controlling method that provide a one-sided braking force to the inner or outer wheels based on steering commands and vehicle yaw rate differences, using a processor to identify and correct oversteering or understeering by adjusting the braking force and desired yaw rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If steer-by-brake function is used to control vehicle turning, then steering control is achieved without physical connection, but the system lacks redundancy to prevent understeering and oversteering during failures
Solution Approach 1:
The brake system is merged with steering control functions, allowing the brake apparatus to perform both braking and steering assistance tasks. The processor integrates steering commands with brake control to achieve steer-by-brake functionality, combining two systems to provide redundant control capability.
Solution Approach 2:
The brake apparatus is designed with multi-functionality, serving both as a braking system and a steering control system. The processor can interpret steering commands and translate them into appropriate brake forces on different wheels, enabling the same hardware to perform multiple functions.
2Stability of the object's composition
If one-sided braking force is applied to correct oversteering, then vehicle stability is improved, but additional control complexity is introduced
Solution Approach 1:
The system continuously monitors vehicle state through motion sensors and compares actual yaw rate with desired yaw rate from steering commands. When oversteering or understeering is detected, the processor provides feedback by adjusting brake forces on specific wheels to correct the deviation, creating a closed-loop control system.
Solution Approach 2:
The brake forces are dynamically adjusted based on real-time vehicle conditions. The processor calculates appropriate brake forces by comparing desired and actual yaw rates, and continuously modifies the braking distribution across wheels to maintain optimal vehicle stability during transient conditions.
Data Source
AI summary
A brake apparatus for a vehicle includes a brake and a processor configured to control the brake, and the processor is configured to receive a steering command including a steering direction from a steering apparatus of a vehicle, control the brake to provide a one-sided braking force to an inner wheel in the steering direction based on the receiving of the steering command, identify oversteering or understeering based on an output of a motion sensor of the vehicle, and control the brake to provide the one-sided braking force to an outer wheel in the steering direction based on the identifying of the oversteering.