Vehicle Behavior Control Detouring Obstacles Without Front Steering
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Solution Overview
Problem
Existing vehicle collision avoidance technologies are not effective in accurately determining the likelihood of collision with obstacles and efficiently controlling vehicle behavior to avoid collisions, particularly when decelerating while traveling straight.
Innovation Solution
A vehicle-behavior control apparatus comprising a collision determining unit and a vehicle-behavior control unit that controls rear wheel steering and differential braking between left and right wheels to detour around obstacles without steering the front wheels, prioritizing driver operations and adjusting control based on vehicle speed and state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle performs collision avoidance control by steering front wheels, then the vehicle can avoid obstacles, but the vehicle stability deteriorates and driver operation becomes conflicting
Solution Approach 1:
Instead of steering the front wheels for collision avoidance, the patent steers the rear wheels in the opposite conventional approach. This inversion allows the vehicle to avoid obstacles while maintaining front wheel alignment with the driving direction, preserving vehicle stability and avoiding conflict with driver operations.
Solution Approach 2:
The patent separates the collision avoidance function from the front steering system and assigns it to the rear wheel steering system. This segmentation allows independent control of obstacle avoidance while maintaining stable front wheel operation for straight-line driving and driver intent.
2Measurement precision
If the vehicle determines collision probability based on obstacle detection alone, then the system is simple, but the collision detection accuracy is insufficient
Solution Approach 1:
The patent implements feedback by detecting the actual running state of the vehicle during braking and using this information to determine collision probability. The system continuously monitors wheel braking state and vehicle motion, feeding this data back to the collision determination unit for more accurate assessment.
Solution Approach 2:
The patent performs preliminary detection of the vehicle's running state under braking conditions before final collision determination. By pre-detecting wheel braking status and vehicle motion characteristics, the system prepares accurate data for collision probability assessment, improving detection accuracy.
3Reliability
If the vehicle continues collision avoidance control after obstacle clearance, then the obstacle is fully avoided, but energy is wasted and unnecessary control actions occur
Solution Approach 1:
The patent uses feedback from continuous obstacle detection to monitor obstacle clearance status. When the detection unit confirms the obstacle has been cleared, the system receives feedback signal to terminate collision avoidance control, preventing unnecessary continued control actions and energy waste.
Solution Approach 2:
The patent prepares for control termination by continuously monitoring obstacle position relative to the vehicle. When clearance is detected, the system preemptively stops control actions before unnecessary continuation can occur, preventing energy waste from prolonged control.
Data Source
AI summary
A vehicle-behavior control apparatus according to an embodiment includes a collision determining unit that determines whether a vehicle collides with an obstacle when the vehicle is decelerated while going straight based on at least a detection result of the obstacle in front of the vehicle and a detection result of a running state of the vehicle in a condition in which wheels are being braked, and a vehicle-behavior control unit that performs at least one of the control of steering rear wheels and the control of giving a difference in braking conditions between the left and right wheels such that the vehicle is decelerated while detouring around the obstacle without steering front wheels when it is determined to collide with the obstacle by the collision determining unit, as one example.