Brake-to-Steer Stability Control Without Steering Angle Signals
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Solution Overview
Problem
Existing vehicle stability control systems fail to effectively prevent vehicle instability and oversteer during Brake-to-Steer operations, especially when electronic power steering systems fail, as they lack the ability to modify brake or powertrain commands without relying on steering wheel angle signals.
Innovation Solution
A stability indicator-based Brake-to-Steer regulation system that modifies brake or powertrain commands in real-time, using indicators such as yaw rate error and differential wheel slip to enhance vehicle lateral stability, even in the absence of steering wheel angle data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing vehicle stability control systems are used during Brake-to-Steer operations, then the system structure remains simple, but vehicle instability and oversteer occur due to inability to modify brake or powertrain commands without steering wheel angle signals
Solution Approach 1:
The system implements feedback control by continuously monitoring vehicle dynamics parameters (lateral acceleration, yaw rate, wheel speeds) and using this information to dynamically adjust brake and powertrain commands. The stability indicator calculation and command modification process creates a closed-loop control system that responds to actual vehicle behavior, ensuring stability during Brake-to-Steer operations without requiring steering wheel angle signals.
Solution Approach 2:
The system introduces an intermediary stability management module that sits between the Brake-to-Steer control and the execution systems. This intermediary calculates stability indicators based on available sensor data and modifies brake/powertrain commands accordingly, acting as a mediator that enables stable operation without direct reliance on steering wheel angle signals or complex additional hardware.
2Reliability
If brake or powertrain commands are modified in real-time during Brake-to-Steer, then vehicle lateral stability is enhanced, but the control system complexity increases
Solution Approach 1:
The system modifies control parameters (brake commands and powertrain torque commands) in real-time based on calculated stability indicators. By dynamically adjusting these parameters according to vehicle state (lateral acceleration, yaw rate, wheel speeds), the system enhances lateral stability without requiring fundamental changes to the control architecture or additional complex hardware components.
3Ease of operation
If multiple stability indicators are used to modify commands, then vehicle controllability is improved, but the computational complexity and processing time increase
Solution Approach 1:
The system performs preliminary calculations of stability indicators using readily available sensor data (lateral acceleration, yaw rate, wheel speeds) before command execution. By pre-calculating these indicators and establishing the relationship between stability state and command modification, the system enables rapid real-time control decisions without excessive computational burden during critical braking maneuvers.
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.