Road Surface Drawing System Uniform Illuminance Control
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Solution Overview
Problem
Existing road surface drawing systems face challenges in maintaining uniform illuminance while minimizing energy efficiency, as the luminous density of light decreases with distance from the vehicle, and current solutions like weakening light near the vehicle to achieve uniformity result in decreased energy utilization.
Innovation Solution
A road surface drawing system that adjusts the light emitting volumes of multiple light sources arranged in an array to maintain constant brightness across different distances from the vehicle, using a reflection type digital light deflection apparatus to project images emphasizing the vehicle's path, with the light sources being controlled based on vehicle speed to optimize energy efficiency and illuminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If uniform illuminance is achieved by weakening light near the vehicle, then illuminance uniformity is improved, but energy utilization efficiency deteriorates
Solution Approach 1:
The patent applies local quality by assigning different light emitting volumes to light sources based on their position in the array. Light sources closer to the vehicle emit less light, while those farther away emit more light, creating a position-dependent illumination strategy that achieves uniform road surface illuminance without uniformly weakening all light sources, thus preserving energy efficiency.
Solution Approach 2:
The patent changes the parameter of light emitting volume according to the distance of each light source from the vehicle. By dynamically adjusting the emission intensity parameter based on position, the system achieves uniform illuminance distribution while optimizing energy utilization, avoiding the energy waste of uniformly reducing all light output.
2Illumination intensity
If light emitting volumes are adjusted to maintain constant brightness, then illuminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent segments the lighting system into multiple independent light sources arranged in an array, each capable of independent control. This segmentation allows the control system to manage complexity by treating each light source as a discrete unit with position-dependent emission characteristics, simplifying the overall control architecture while achieving uniform illuminance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively maintains uniform illuminance on the road surface while maximizing energy efficiency by adjusting light emitting volumes and projection distances, ensuring the image is clearly visible and recognizable to the driver without compromising light utilization efficiency.
Implementation Method 1
using a reflection type digital light deflection apparatus to project images
Data Source
Figure 1
Figure 2~3
Figure 4A~4C
AI summary
A road surface drawing system (1) is mounted on a vehicle and configured to draw an image (58) on a road surface in front of the vehicle, the road surface drawing system (1) including a traveling path drawing unit (10, 210, 310) configured to radiate light and draw an image on a road surface, a vehicle speed detecting unit (16) configured to detect a speed of the vehicle, and a control unit (13) configured to control the traveling path drawing unit, wherein the traveling path drawing unit (10, 210, 310) has a light source unit (20, 320, 320R, 320G, 320B), an image generating unit (31) configured to modulate light emitted from the light source unit and form an image, and a projecting unit (41) configured to project the light having the image to the road surface, and the control unit (13) changes a distance of the image with respect to the vehicle based on the detection result of the vehicle speed detecting unit (16).