Vehicle Control System for Spin Stability via Relative Slip Angle
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Solution Overview
Problem
Conventional vehicle control systems struggle to maintain stability during hydroplaning or spinning, as they are prone to instability and lack effective control measures to prevent or mitigate these conditions.
Innovation Solution
The system computes the relative slip angle between the ego vehicle and a leading vehicle, sets a spin judgment threshold, and controls yaw moment to reduce the relative slip angle when it exceeds the threshold, ensuring stability by applying appropriate steering and braking forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vehicle control systems are used during hydroplaning or spinning conditions, then the system structure remains simple, but vehicle stability deteriorates and the vehicle is likely to spin
Solution Approach 1:
The system performs preliminary detection of spin conditions by monitoring relative slip angle between the ego vehicle and leading vehicle before actual spinning occurs. By detecting the relative slip angle and comparing it against threshold values, the system initiates preventive yaw moment control actions in advance, stabilizing the vehicle before hydroplaning or spinning fully develops.
Solution Approach 2:
The system continuously monitors the relative slip angle between the ego vehicle and leading vehicle, compares it against dynamically adjusted threshold values, and provides feedback to the yaw moment control unit. This closed-loop feedback mechanism enables real-time adjustment of yaw moment to maintain vehicle stability during slippery conditions.
2Reliability
If yaw moment control is applied to prevent spinning, then vehicle stability improves, but excessive control interventions may occur that disorient the driver
Solution Approach 1:
The system applies partial yaw moment control only when the relative slip angle exceeds dynamically adjusted threshold values, rather than continuous full control. By using conditional threshold-based activation, the system provides just enough control intervention to maintain stability without excessive action that would disorient the driver.
Solution Approach 2:
The control thresholds are dynamically adjusted based on vehicle speed and other operating conditions. As vehicle speed changes, the threshold values for triggering yaw moment control are modified accordingly, allowing the system to adapt its control intensity to match current driving conditions and driver expectations.
Data Source
AI summary
There is provided a vehicle control system capable of ensuring stability even if an ego vehicle spins slowly. The invention computes a relative slip angle between a leading vehicle and the ego vehicle on the basis of distance between the ego vehicle and the leading vehicle and distance between a traveling-direction virtual line extending from the ego vehicle in a traveling direction and the leading vehicle, sets a spin judgment threshold value according to the relative slip angle, and controls yaw moment to reduce the relative slip angle when the relative slip angle exceeds the spin judgment threshold value.