Vehicle Stability Control After Guardrail Collision
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Solution Overview
Problem
Conventional vehicle control systems fail to maintain stability when a vehicle collides with a travel-path defining line, such as a guardrail, leading to instability in vehicle behavior.
Innovation Solution
The system recognizes the travel-path defining line and imparts a yaw moment control to reduce the angle between the vehicle's traveling direction and the travel-path defining line after collision, using a combination of stereo cameras, electrically-assisted power steering, and hydraulic brake units to stabilize the vehicle's attitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional technology detects guardrail and generates yaw moment, then vehicle can avoid contact with guardrail, but vehicle stability cannot be secured when collision occurs
Solution Approach 1:
The control system dynamically changes its behavior based on collision detection. Before collision, the system operates in avoidance mode generating yaw moment to prevent contact. After collision detection (through acceleration sensor or camera-based contact detection), the system switches to stabilization mode, continuously applying yaw moment control to maintain vehicle parallel to the guardrail, thereby adapting to the changed situation and securing vehicle stability
Solution Approach 2:
The system employs feedback mechanisms to detect collision events and adjust control strategies accordingly. The camera system provides visual feedback about the vehicle's position relative to the guardrail, and acceleration sensors provide dynamic feedback about collision occurrence. This feedback enables the system to recognize when collision has occurred and switch from avoidance control to post-collision stabilization control, maintaining vehicle stability through continuous monitoring and adjustment
2Reliability
If yaw moment control is applied after collision, then vehicle can be stabilized parallel to travel-path defining line, but requires complex control system
Solution Approach 1:
The control system integrates multiple functions into a unified control architecture. The same camera system and electronic control unit that perform lane keeping and obstacle detection also handle collision detection and post-collision stabilization. The yaw moment control mechanism serves dual purposes: avoiding collision before impact and stabilizing the vehicle after impact, reducing the need for separate dedicated systems and managing complexity through multi-functionality
Solution Approach 2:
The patent merges the pre-collision avoidance control and post-collision stabilization control into a single integrated control system. The electronic control unit combines processing of camera images, acceleration sensor data, and steering control to provide continuous vehicle guidance. By merging detection and control functions, the system achieves comprehensive stability management without requiring separate complex subsystems
Data Source
AI summary
Provided is a vehicle control system capable of securing stability even in the event of a collision with a travel-path defining line such as a guardrail. The invention recognizes the travel-path defining line of a travel path from information about an area in a traveling direction of an ego vehicle, recognizes a traveling-direction virtual line extending from the ego vehicle in the traveling direction, and imparts a yaw moment control amount so that a formed angle between the traveling-direction virtual line and the travel-path defining line decreases after the ego vehicle collides with the travel-path defining line.