Adaptive Headlight Dimming Gradient for Anti-Dazzle Beam Control
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Solution Overview
Problem
Existing vehicle headlights with Adaptive Driving Beam (ADB) control may cause dazzling of other vehicles during collisions due to undimmed regions overlapping with the visual recognition parts of other vehicles, necessitating further suppression of dazzling effects.
Innovation Solution
A vehicle headlight system with a light source unit and control unit that adjusts light intensity and distribution patterns based on detection signals from other vehicles, specifically reducing light intensity towards visual recognition areas and forming gradations in surrounding regions to prevent sudden bright irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ADB control is implemented to suppress dazzling by darkening overlapping regions, then dazzling suppression is improved, but during vehicle collision the undimmed regions may suddenly overlap with visual recognition parts causing dazzling
Solution Approach 1:
The patent segments the light distribution pattern into multiple controllable regions with different dimming characteristics. Specifically, it divides the illumination area into a first region (higher dimming rate) and a second region (lower dimming rate), allowing independent control of dimming rates for each segment. This segmentation enables the system to maintain reliable dazzling suppression even during collision scenarios where the vehicle posture changes, as the gradient structure ensures that visual recognition parts remain protected regardless of which region overlaps with them.
Solution Approach 2:
The patent applies different dimming rates to different spatial regions to create a gradient light distribution pattern. The first region has a higher dimming rate while the second region has a lower dimming rate, creating localized quality variations in the light pattern. This local quality approach ensures that areas more likely to overlap with visual recognition parts (such as windshields and mirrors) receive stronger dimming, while maintaining overall illumination effectiveness.
2Object-affected harmful factors
If light intensity is reduced toward visual recognition parts to suppress dazzling, then dazzling suppression is improved, but illumination effectiveness for the driver may be reduced
Solution Approach 1:
The patent dynamically changes the light intensity parameters by controlling the dimming rates of different regions based on the relative position between the ego-vehicle and the other vehicle. The control unit calculates the optimal dimming rate for each region to balance dazzling suppression and illumination effectiveness. This parameter adjustment ensures that visual recognition parts are adequately darkened while maintaining sufficient overall illumination for the driver's visibility.
Solution Approach 2:
By applying different dimming rates to different regions (higher rate for the first region, lower rate for the second region), the patent creates a localized quality variation that protects visual recognition parts from dazzling while preserving illumination effectiveness in other areas. This selective dimming approach ensures that the driver's view is not compromised while still suppressing dazzling to other vehicles.
3Device complexity
If uniform dimming is applied across all regions to suppress dazzling, then dazzling suppression is simplified, but it cannot effectively prevent sudden bright irradiation when vehicle posture changes
Solution Approach 1:
The patent divides the light distribution pattern into multiple regions with different dimming characteristics, creating a segmented control structure. This segmentation into a first region and a second region with different dimming rates provides a systematic approach to handling vehicle posture changes. The gradient structure ensures that when the vehicle tilts or collides, the transition between regions prevents sudden bright irradiation, maintaining reliable protection without excessive complexity.
Data Source
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AI summary
A vehicle headlight (1) is equipped with: a light source unit (10) for forming a light distribution pattern which can be changed by light beams emitted from a light source group (130); and a control unit (CO). In a case where a detection signal of another vehicle present in front of an ego-vehicle (100) is inputted from a detection unit (29) for detecting the other vehicle, the control unit (CO) causes first light sources of the light source group (130), which emit light toward a first region (AR1) including a region overlapping a visual recognition part of the other vehicle used by a driver thereof to visually recognize the outside of the other vehicle, to emit light having a lower intensity than in a case where no detection signal is inputted, and causes second light sources, among second light sources of the light source group (130) that emit light toward a second region (AR2) surrounding the first region (AR1), which emit light toward a lower-side region (BA1) lower than the first region (AR1), to emit light with an increasingly lower intensity toward the side closer to the first region (AR1).