Brake-to-Steer Stability Control for Steering Failure Oversteer
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Solution Overview
Problem
Existing vehicle stability control systems are inadequate during Brake-to-Steer operations, particularly when electronic power steering systems fail, leading to potential vehicle instability and oversteer, as they lack the ability to effectively modulate brake and powertrain commands based on comprehensive stability indicators.
Innovation Solution
A stability indicator-based Brake-to-Steer regulation system that modifies brake and powertrain commands in real-time, using indicators such as yaw rate error and differential wheel slip to prevent vehicle instability, by applying brake or powertrain forces to individual wheels, enhancing vehicle lateral stability and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing vehicle stability control systems are used during Brake-to-Steer operations, then basic braking functionality is maintained, but vehicle instability and oversteer cannot be effectively prevented
Solution Approach 1:
The system continuously monitors multiple stability indicators including yaw rate error, differential wheel slip, and vehicle lateral acceleration. This feedback mechanism allows the control system to detect instability conditions in real-time and dynamically adjust brake commands to individual wheels, thereby preventing vehicle oversteer and maintaining lateral stability during Brake-to-Steer operations
Solution Approach 2:
The stability control system applies braking forces independently to individual wheels based on calculated stability indicators. By segmenting the braking control to each wheel rather than applying uniform braking, the system can precisely counteract lateral instability and oversteer tendencies, improving overall vehicle stability during steering maneuvers
2Reliability
If brake or powertrain commands are modified in real-time based on stability indicators, then lateral stability is improved, but system complexity increases
Solution Approach 1:
The control system integrates multiple functions into a single stability management module that calculates stability indicators, determines brake command modifications, and coordinates with both braking and powertrain systems. This multi-functional approach improves lateral stability while managing system complexity by consolidating control logic rather than adding separate dedicated systems for each function
Solution Approach 2:
The system modifies brake and powertrain commands by adjusting parameters such as brake force magnitude and distribution based on calculated stability indicators. By changing operational parameters rather than adding physical components, the system achieves improved lateral stability with minimal increase in device complexity
3Ease of operation
If comprehensive stability indicators are used for Brake-to-Steer regulation, then vehicle controllability is improved, but computational requirements increase
Solution Approach 1:
The system calculates and monitors multiple stability indicators including yaw rate error, differential wheel slip, and lateral acceleration, using more computational resources than a minimal system would require. This excessive computational approach ensures comprehensive vehicle controllability by considering multiple stability aspects simultaneously, providing robust control during Brake-to-Steer operations
Data Source
AI summary
A number of variations are disclosed including a system and method for modifying, in real-time, at least one brake or powertrain application to individual roadwheels of a vehicle to increase lateral maneuver capability in a vehicle having an operational, partially operational, failing, or failed electronic steering system. The system and method may include modifying at least one brake or powertrain command to individual roadwheels where vehicle instability is detected.