Dock Lighting System with Motion Sensing Glare Control
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Solution Overview
Problem
Loading dock environments, particularly those with enclosed trucks or trailers, face challenges in providing adequate lighting to ensure safety during loading and unloading operations, as existing solutions do not effectively adjust light output based on the direction of moving personnel or equipment, potentially leading to hazards from excessive brightness or insufficient illumination.
Innovation Solution
A lighting system that includes a motion sensing system and a controller to adjust the light output of a lamp installed near a dock leveler, switching between high and low beam modes based on the direction of moving bodies and incorporating a peripheral sensor for warning lights, while also using an articulated arm for adjustable positioning and energy-saving features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light fixture is installed to illuminate the interior of an enclosed trailer, then visibility inside the trailer is improved, but excessive brightness may cause glare hazards for personnel operating material handling equipment
Solution Approach 1:
The lighting system dynamically adjusts its operation between full illumination and reduced output modes based on real-time detection of material handling equipment. The system transitions from a static lighting state to a dynamic one that responds to operational conditions, resolving the contradiction between providing adequate illumination and preventing glare hazards.
Solution Approach 2:
The system uses sensors to detect the presence and movement of material handling equipment, then feeds this information back to the lighting control to adjust light output accordingly. When equipment is detected moving toward the doorway, the system reduces brightness to eliminate glare; when equipment moves away or is absent, full illumination is restored.
2Reliability
If the light fixture operates continuously at high output, then adequate illumination is maintained for safety, but energy consumption increases
Solution Approach 1:
Instead of continuous high-output operation, the lighting system employs periodic adjustment based on detected motion patterns. The system alternates between high-output mode (when no equipment is present or equipment has moved away) and reduced-output mode (when equipment is detected), thereby maintaining safety illumination only when necessary and reducing energy consumption during periods when full illumination is not required.
3Use of energy by moving object
If the light output is reduced to prevent glare, then energy consumption decreases, but illumination adequacy for safety may be compromised
Solution Approach 1:
The system continuously monitors the position and movement of material handling equipment using sensors. When equipment moves away from the doorway area or stops moving, the system receives feedback that triggers a restoration of full light output, ensuring safety illumination is maintained at appropriate times while still achieving energy savings during equipment operation phases when glare would be hazardous.
Data Source
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AI summary
A method comprises projecting a light output from a lamp (12), the light output to illuminate an interior of a vehicle (14), the light output corresponding to more light when the lamp (12) is in a first illuminating mode than when the lamp (12) is in a second illuminating mode, the light output corresponding to more light when the lamp (12) is in the second illuminating mode than when the lamp (12) is off; sensing a body (26) moving within the vehicle (14); determining whether the body (26) is moving closer to or farther away from the lamp (12); and adjusting the light output by switching the lamp (12) between the first illuminating mode and the second illuminating mode based on whether the body (26) is moving closer to or farther away from the lamp (12).