Vehicle Security Device with Line-of-Sight Screening Detection
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Solution Overview
Problem
Existing vehicle security systems inadequately manage security levels when a vehicle is parked in a location where it is screened by a building or obstacle, leading to decreased security despite the user's inability to visually monitor the vehicle.
Innovation Solution
A security device with a determination unit to assess whether screening occurs between the vehicle and the user, and a control unit to adjust the security level accordingly, considering factors like position, altitude, and direction, ensuring appropriate security management based on the user's situation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the security level is decreased when the distance between the vehicle and the user is near, then the ease of operation is improved, but the reliability deteriorates when the vehicle is screened by a building
Solution Approach 1:
The patent introduces a line-of-sight determination unit as an intermediary between the distance measurement and security level control. This unit checks whether the user can actually see the vehicle by determining if a straight line between user and vehicle positions is blocked by buildings or other obstacles. Only when both distance is near AND line-of-sight is clear does the system decrease security level, resolving the contradiction by adding a mediating verification step.
Solution Approach 2:
The system changes the parameters used for security level determination from solely distance-based to a composite parameter including both distance and line-of-sight status. By introducing the line-of-sight parameter (clear/blocked state), the system can distinguish between situations where the user is physically near but cannot see the vehicle versus situations where the user is near and can monitor the vehicle, thus maintaining reliability while preserving ease of operation.
2Reliability
If the security level is increased when the distance between the vehicle and the user is far, then the reliability is improved, but the ease of operation deteriorates due to unnecessary security increases
Solution Approach 1:
The line-of-sight determination unit acts as an intermediary that verifies whether distance-based security level adjustments are appropriate. Even when the user is far from the vehicle, the system checks if buildings or obstacles block the view. This prevents unnecessary security level increases when the user is far but still has a clear view, thus improving reliability while maintaining ease of operation by avoiding false security concerns.
3Device complexity
If the security level is decreased based on distance alone, then the device complexity is reduced, but the measurement precision of security needs deteriorates
Solution Approach 1:
The patent segments the security level determination process into two independent functional units: a distance measurement unit and a line-of-sight determination unit. This segmentation allows each unit to perform its specific function with appropriate precision without increasing overall system complexity. The distance unit handles positional data while the line-of-sight unit handles visual accessibility data, and their results are combined for final security level determination.
Solution Approach 2:
The line-of-sight determination unit serves multiple functions: it verifies whether the user can see the vehicle, determines if buildings are blocking the view, and provides this information to the security level control unit. This multi-functionality allows the system to improve measurement precision of security needs without proportionally increasing device complexity, as one component performs multiple critical assessment tasks.
Data Source
AI summary
The above security device determines whether there occurs screening between a movable body such as a vehicle and a user, and controls the security level in accordance with the determination result. Specifically, the security device sets the security level high when there occurs screening between the movable body and the user, and sets the security level low when there occurs no screening.