Adaptive Headlamp Light Distribution for Forked-Road Guidance
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Solution Overview
Problem
Conventional Adaptive Driving Beam (ADB) control systems cause discomfort to drivers of leading vehicles due to glare and lack effective guidance at forked roads.
Innovation Solution
A light distribution control device and method that adjusts light intensity distribution to reduce glare on leading vehicles and guide drivers towards the correct path at forked roads using a light distribution variable lamp, capable of forming dimmed or blurred light patterns based on detected objects and navigation data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional ADB control dims light toward leading vehicles, then glare on leading vehicle drivers is reduced, but effective guidance at forked roads is lost
Solution Approach 1:
The patent segments the illumination control into different regions: the region toward the leading vehicle is dimmed to reduce glare, while the region corresponding to the forked road is maintained at normal illuminance to provide guidance information. This spatial segmentation allows simultaneous achievement of both glare reduction and road guidance.
Solution Approach 2:
The patent applies different illumination qualities to different spatial locations: high illuminance is applied to the forked road region to provide guidance, while low illuminance is applied to the leading vehicle region to reduce glare. This local differentiation of illumination quality resolves the contradiction between glare reduction and guidance provision.
2Loss of information
If normal light distribution pattern illuminates both traveling and non-traveling roads, then road guidance information is provided, but glare on leading vehicles increases
Solution Approach 1:
The patent divides the light distribution into segmented regions with different illuminance levels: the forked road region receives full illuminance for guidance, while the leading vehicle region receives reduced illuminance to minimize glare. This segmentation enables selective illumination that satisfies both requirements.
Solution Approach 2:
The patent implements local quality control by applying high illuminance specifically to the forked road area and low illuminance to the leading vehicle area. This localized differentiation allows the system to provide guidance information where needed while avoiding glare in sensitive regions.
3Object-affected harmful factors
If light intensity is reduced toward leading vehicles, then driving comfort of leading vehicle driver is improved, but visibility of host vehicle driver at forked roads deteriorates
Solution Approach 1:
The patent segments the illumination control to apply different intensity levels to different regions: reduced intensity toward the leading vehicle to improve driving comfort, and normal intensity toward the forked road to maintain visibility. This spatial segmentation resolves the visibility-comfort contradiction.
Solution Approach 2:
The patent applies local quality control by maintaining high illuminance in the forked road region for visibility while applying low illuminance in the leading vehicle region for comfort. This localized approach allows simultaneous optimization of both visibility and driving comfort.
Data Source
AI summary
A light distribution control device controls formation of a light distribution pattern by a light distribution variable lamp. The light distribution control device controls the light distribution variable lamp so as to reduce an illuminance of light that illuminates a non-traveling road when a vehicle reaches a first location a predetermined distance before a forked road, while a normal light distribution pattern is formed that includes, in an illumination range thereof, a side illuminating a traveling road of the vehicle at the forked road and a side illuminating the non-traveling road, and to form a guiding light distribution pattern in which an illuminance of light that illuminates the traveling road is higher than the illuminance of the light that illuminates the non-traveling road.