Vehicle Stability Control via Coordinated Steering and Braking
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Solution Overview
Problem
Existing vehicle control systems, such as ESC, may intervene excessively during dynamic driving, failing to rapidly stabilize vehicles experiencing excessive oversteering, which can lead to accidents.
Innovation Solution
A vehicle control system and method that includes a detecting portion for vehicle information, a controller for determining oversteering and applying counter-steering torque, and a rear wheel steering device for reverse phase control, minimizing ESC intervention by using a combination of braking, steering assist torque, and rear wheel steering to stabilize the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ESC system performs braking control to stabilize vehicle, then vehicle stability is improved, but ESC intervention becomes excessive and fails to rapidly stabilize excessive oversteering
Solution Approach 1:
The patent combines multiple control functions (braking control, steering assist torque, and rear wheel steering control) into a unified control system that works synergistically. The controller integrates these three control mechanisms to rapidly stabilize excessive oversteering, achieving both high reliability and fast stabilization speed that cannot be achieved by braking control alone.
Solution Approach 2:
The system dynamically adjusts the level of ESC intervention based on the severity of oversteering conditions. By monitoring vehicle state continuously, the controller activates and adjusts the combination of braking, steering assist, and rear wheel steering controls dynamically, enabling rapid stabilization while avoiding excessive intervention in normal driving conditions.
2Reliability
If ESC system intervenes during dynamic driving, then vehicle stability is improved, but driving performance and responsiveness deteriorate
Solution Approach 1:
The system applies partial control actions selectively based on driving conditions. Instead of continuous full intervention, the controller applies braking control, steering assist torque, or rear wheel steering control in specific combinations and intensities appropriate to the detected oversteering severity, maintaining driving performance while ensuring stability when needed.
Solution Approach 2:
The control system continuously monitors vehicle state parameters (yaw rate, steering angle, wheel speeds) and uses this feedback to adjust the level and type of intervention. This closed-loop control ensures that ESC intervention is applied only when necessary and at the appropriate intensity, preserving driving performance while maintaining stability.
3Device complexity
If only braking control is used to stabilize oversteering, then system complexity is reduced, but stabilization effectiveness is insufficient for excessive oversteering
Solution Approach 1:
The control system is segmented into three distinct control modules: braking control module, steering assist torque module, and rear wheel steering control module. Each module can be activated independently or in combination based on the severity and type of oversteering detected, allowing the system to achieve high stabilization effectiveness while maintaining manageable complexity through modular design.
Data Source
AI summary
A vehicle control system and a method for the same, which are configured for rapidly stabilizing a behavior of a vehicle when an unstable behavior of the vehicle occurs while the vehicle is turning, and, if excessive oversteering occurs, securing a driving characteristic of a vehicle by minimizing intervention of an electronic stability control (ESC) device of the vehicle, may include an ESC device, a steering control device, and a rear wheel steering device, and configured for immediately enhancing stability of a vehicle through cooperative control between the ESC device, the steering control device, and the rear wheel steering device even when excessive oversteering occurs.