Vehicle Collision Avoidance for Bicycle Dynamics
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Solution Overview
Problem
Existing vehicle collision avoidance systems lack an effective strategy to handle collisions with bicycles, as they do not account for the specific dynamics of bicycle movement, such as transverse positioning and escape times, leading to inefficient collision avoidance maneuvers.
Innovation Solution
A vehicle system equipped with sensors to detect bicycles and a controller that calculates the time to collision and expected collision position, transmitting deceleration or cross avoidance control signals based on the bicycle's movement times to gradually reduce speed or temporarily stop the vehicle, thereby preventing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a uniform collision avoidance control strategy is applied to all objects, then the control system is simple to implement, but it cannot effectively handle the specific dynamics of bicycles such as transverse positioning and escape times
Solution Approach 1:
The patent segments the collision avoidance control into different strategies based on object type. Specifically, it divides the control approach into uniform control for general objects and specialized control for bicycles, which accounts for their unique movement characteristics such as transverse positioning and escape times. This segmentation allows the system to adapt to different object dynamics without requiring complete redesign for each object type.
Solution Approach 2:
The patent implements dynamic control adjustment by varying the collision avoidance strategy based on the detected object type. When a bicycle is detected, the system dynamically switches to a specialized control mode that considers bicycle-specific parameters like transverse position and escape time, rather than using a static uniform control approach. This dynamic adaptation enhances the system's ability to handle diverse object behaviors.
2Reliability
If the vehicle stops immediately to avoid collision with a bicycle, then collision risk is reduced, but the vehicle may stop unnecessarily when the bicycle is far from the driving lane
Solution Approach 1:
The patent calculates the escape time of the bicycle in advance to determine whether immediate stopping is necessary. By performing this preliminary calculation, the system can distinguish between situations where the bicycle poses an immediate collision risk and those where it does not, thereby avoiding unnecessary stops while ensuring safety when needed.
Solution Approach 2:
The system continuously monitors the bicycle's position, movement speed, and distance from the driving lane, using this feedback to dynamically adjust the stopping decision. This feedback mechanism allows the system to make informed decisions about whether to stop, preventing unnecessary stops when the bicycle is far from the lane while ensuring timely stops when collision risk is high.
3Ease of operation
If the vehicle gradually reduces speed to avoid collision, then the stopping distance is extended, but the collision avoidance may be insufficient when the bicycle is close to the driving lane
Solution Approach 1:
The patent dynamically adjusts the speed reduction strategy based on the bicycle's proximity to the driving lane. When the bicycle is far from the lane, the system applies gradual speed reduction for smoother operation. When the bicycle approaches the lane, the system intensifies the deceleration to ensure adequate collision avoidance. This dynamic adjustment of braking intensity resolves the contradiction between smooth operation and effective collision avoidance.
Data Source
AI summary
A vehicle includes: a sensor configured to detect an object moving in front of the vehicle; a controller configured to determine a longitudinal driving time taken for the vehicle to drive to the object, and configured to transmit a deceleration avoidance control signal gradually reducing a driving speed of the vehicle so that the vehicle is stopped before colliding with the object or a cross avoidance control signal stopping the vehicle until the object escapes from a driving lane of the vehicle, based on the longitudinal driving time and a transverse moving time of the object; and a speed regulator configured to regulate the driving speed of the vehicle in response to the transmitted control signal.