Vehicle Door Detection with Dynamic Sensor Selection
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Solution Overview
Problem
Existing door opening and closing devices struggle to securely detect user operations when obstacles like walls or stationary vehicles are present, leading to difficulties in opening and closing doors automatically.
Innovation Solution
A door opening and closing device equipped with a pair of detectors arranged horizontally on a vehicle body, which repeatedly detect distances to moving and stationary objects, and a control unit that determines the nature of detected targets to secure the necessary space for user operations by adjusting detection stages based on the presence of stationary objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detection section is formed by overlapping detection ranges of a pair of distance measurement sensors, then the door can be automatically opened and closed when a user performs a predetermined operation, but it becomes difficult to secure the entire length of the detection section when stationary objects like walls or other vehicles exist around the vehicle
Solution Approach 1:
The patent applies dynamics by making the detection section configurable and adaptable based on the environment. The system dynamically adjusts which detector's results to use based on whether stationary objects are present. When a stationary object is detected within a predetermined distance, the system switches to using only the detection result from the detector that detected the moving object, rather than requiring the overlapping detection section. This dynamic adaptation allows the door opening/closing function to work reliably in both open spaces and narrow spaces with obstacles.
2Measurement precision
If both detection results are used when a stationary object is present, then detection accuracy may improve, but the space required for user operation is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the detection parameters (which detector results to use) based on the presence of stationary objects. The system changes the detection mode from using both detectors' results (when no stationary object is present) to using only the moving object detector's result (when a stationary object is detected within predetermined distance). This parameter change optimizes the balance between detection accuracy and user operation space, allowing the system to maintain detection reliability while providing sufficient space for users to perform predetermined operations even in narrow spaces.
Data Source
AI summary
A door opening and closing device includes: first and second detectors repeatedly detect a distance to a detection target around the door; and a control unit opens and closes the door using a drive unit when a predetermined operation having a plurality of stages performed by a moving object is detected. The control unit determines whether first and second objects respectively detected by the first and second detectors are the moving or stationary object. When one of the first and second objects is the moving object and the other is the stationary object and a distance to the stationary object is shorter than a first determination value, both the detection results of the first and second detectors are used for detection at a final stage, and only the detection result of the first or second detector detecting the moving object is used for detection at the other stages.