Vehicle Headlight Glare Control via Illuminance Threshold Comparison
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Solution Overview
Problem
Existing control units for vehicle headlights fail to selectively reduce glare only when necessary, leading to unnecessary reduction in illuminated areas and misidentification of objects that are weakly illuminated as requiring glare reduction.
Innovation Solution
A control device with a memory to store illuminance levels for main headlights, comparing these levels with a predetermined amount to adjust light distributions and vertical light-dark boundaries dynamically, reducing illuminance only when necessary and maintaining adjustments for low illuminance levels to avoid glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the control unit reduces glare for every detected object, then glare protection is improved, but unnecessary illumination reduction occurs in areas where glare reduction is not needed
Solution Approach 1:
The control unit applies glare reduction selectively to specific locations based on illuminance thresholds. Instead of uniformly reducing glare for all detected objects, the system adjusts illumination locally only in areas where the illuminance exceeds the predetermined threshold, preserving normal illumination in areas where glare reduction is unnecessary.
Solution Approach 2:
The control unit changes the illuminance parameter dynamically based on comparison with a predetermined threshold. When the illuminance at a detected object's location exceeds the threshold, the control unit adjusts the light distribution to reduce glare; otherwise, it maintains normal illumination, thereby avoiding unnecessary illumination reduction.
2Object-affected harmful factors
If the control unit identifies more objects for glare reduction, then glare protection coverage is improved, but false identification of weakly illuminated objects as glare sources increases
Solution Approach 1:
The control unit uses illuminance level comparison as a discriminative parameter to accurately identify objects requiring glare reduction. By comparing the measured illuminance at each object's location against a predetermined threshold, the system distinguishes between actual glare sources (high illuminance) and non-glare objects (low illuminance), preventing false identification.
Solution Approach 2:
The patent replaces subjective or simplistic object detection methods with an objective illuminance-based identification system. Instead of relying on object detection alone, the control unit uses measured illuminance levels to determine whether glare reduction is necessary, substituting mechanical/object-based detection with photometric measurement for more accurate identification.
Data Source
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AI summary
The control device has a processing unit that sets parameters for adjusting light distribution and light-dark boundary at right or left headlight in dependence on the scanned information. An output unit outputs the set parameter for adjusting the light distribution and the light-dark boundary. A control unit controls light distribution of headlight to preset location, by comparing the set parameters with illuminance value stored in the memory. An independent claim is included for a method for controlling headlights of vehicle.