Corner-Based Wheel Moment Control for Yaw Stability
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Solution Overview
Problem
Existing vehicle control systems face challenges in accurately managing yaw moment and wheel slip during transient maneuvers, especially under uncertain road conditions, leading to potential yaw instability and inefficiencies in control command execution.
Innovation Solution
A corner-based control system that processes data related to the vehicle's center of gravity to determine wheel moment adjustment commands and control outputs, using a processor to selectively control active safety and chassis system components, thereby mitigating the need for precise road condition estimation and improving interaction between yaw moment and force controllers with wheel slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If yaw moment control is applied to improve vehicle handling at limits, then vehicle control capability is improved, but wheel slip increases which may cause yaw instability
Solution Approach 1:
The system dynamically adjusts wheel moment commands by changing control parameters based on real-time wheel slip conditions. When wheel slip exceeds thresholds, the system modifies the magnitude and distribution of wheel moments to maintain stability while preserving control capability.
Solution Approach 2:
The control system continuously monitors wheel slip conditions and feeds this information back to adjust yaw moment commands. This closed-loop feedback mechanism prevents excessive wheel slip that would cause yaw instability while maintaining effective vehicle control.
2Stability of the object's composition
If control commands are adjusted to reduce wheel slip, then yaw stability is improved, but control response speed decreases
Solution Approach 1:
The system implements dynamic adjustment of control commands based on real-time wheel slip conditions. The control strategy adapts its aggressiveness according to the severity of wheel slip, allowing rapid response when stability is compromised while maintaining faster overall response through intelligent conditional adjustment rather than continuous conservative limiting.
3Stability of the object's composition
If tire/road capacity constraints are applied to mitigate yaw instability, then wheel slip control is improved, but the system complexity increases due to difficulty in accurate road condition estimation
Solution Approach 1:
The control system uses readily available sensor data from the vehicle's existing wheel speed and yaw rate sensors to infer wheel slip conditions and implicitly estimate effective tire/road capacity. This self-service approach avoids the need for separate, complex road condition estimation systems while still achieving effective wheel slip control through physics-based calculations from measured vehicle states.
Data Source
AI summary
Methods and systems are provided for controlling a component of a vehicle. In one embodiment, a method includes: receiving, by a processor, data associated with a center of gravity of the vehicle; determining, by a processor, a wheel moment adjustment command for each wheel of the vehicle based on the received data; determining, by a processor, at least one control output based on driver commands and the wheel moment adjustment command for each wheel; and selectively controlling, by a processor, at least one component associated with at least one of an active safety system and a chassis system of the vehicle based on the at least one control output.