Collision Detector With Segmented Enter and Exist Areas
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Solution Overview
Problem
Conventional collision detectors fail to accurately detect potential collisions between a subject vehicle and external objects, particularly when pedestrians move in the same direction as the vehicle or when the vehicle changes direction, leading to late warnings or incorrect determinations.
Innovation Solution
A collision detection system that defines two areas - an enter-determination area and an exist-determination area - based on the movement vector of external objects and the subject vehicle's speed, allowing for accurate detection of potential collisions by varying the detection area according to the object's proximity and speed, and includes a travel direction sensor to adjust the detection zones accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single warning area is defined based on relative speed, then the device complexity is reduced, but the measurement precision of collision detection deteriorates when pedestrians move in the same direction as the vehicle
Solution Approach 1:
The detection area is segmented into multiple zones: a first detection area for objects moving in the same direction as the vehicle, and a second detection area for objects moving in opposite directions. This segmentation allows each area to be optimized for its specific detection scenario, improving overall detection accuracy without excessive complexity
Solution Approach 2:
The detection areas are dynamically adjusted based on the vehicle's movement state. When the vehicle is moving, the first detection area is configured for same-direction pedestrians; when stationary, a third detection area is activated for approaching objects. This dynamic reconfiguration maintains high detection precision across different operating conditions
2Device complexity
If the detection area is fixed assuming constant forward travel, then the device complexity is reduced, but the reliability of collision detection deteriorates when the vehicle changes direction after stopping
Solution Approach 1:
The detection system dynamically reconfigures the detection area based on the vehicle's operational state. A third detection area is specifically configured for when the vehicle is stationary, and the system switches between different detection areas based on whether the vehicle is moving or stopped, ensuring reliable detection regardless of direction changes
Solution Approach 2:
The detection parameters are changed based on vehicle state: when the vehicle is moving, the first and second detection areas are active with specific size and position parameters; when stationary, the third detection area is activated with different parameters optimized for detecting approaching objects from any direction
3Ease of operation
If a single detection area is used for all objects, then the ease of operation is improved, but the measurement precision deteriorates when objects are at different distances from the vehicle
Solution Approach 1:
The detection system segments objects based on their distance from the vehicle, creating different detection areas optimized for specific distance ranges. This allows the system to maintain simple operation while achieving high precision by applying appropriate detection parameters for each distance zone
Data Source
AI summary
A collision detector accurately detects a situation where a subject vehicle is likely to come into contact with an external object. The collision detector defines a subject area including an enter-determination area and an exist-determination area. The enter-determination area is defined to determine that the external object entering therein is likely to come into contact with the subject vehicle. The exist-determination area is defined to determine that the external object existing therein is likely to come into contact with the subject vehicle. The detector determines whether the external object comes into the enter-determination area or the external object exists in the exist-determination area. The detector outputs that the subject vehicle is likely to come into contact with the external object when the external object comes into the enter-determination area or when the external object exists in the exist-determination area.