Adaptive Vehicle Headlight Beam Shaping for Glare and Dark Zone Control
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Solution Overview
Problem
Existing vehicle headlights struggle to balance light distribution to prevent glare to oncoming vehicles while maintaining visibility and comfort for the driver, often causing discomfort due to abrupt brightness changes and reduced visibility when adjusting light patterns.
Innovation Solution
A vehicle headlight system that adjusts light distribution patterns by decreasing light in regions overlapping with detected objects and increasing light in surrounding regions, with controlled light increase rates to prevent excessive brightness and maintain visibility, using a control unit to manage light emission based on object detection signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the light distribution pattern is adjusted to reduce glare to other vehicles by decreasing light in regions overlapping with detected objects, then glare suppression is improved, but visibility and driver comfort deteriorate due to dark areas and abrupt brightness changes
Solution Approach 1:
The patent applies local quality by creating different light intensity characteristics in different regions of the light distribution pattern. Specifically, the first regions overlapping with detected objects have decreased light intensity to suppress glare, while the second regions surrounding the first regions have increased light intensity to maintain visibility. This spatial differentiation of light properties resolves the contradiction between glare suppression and visibility maintenance.
Solution Approach 2:
The light distribution pattern is segmented into multiple functional regions: first regions where light is decreased to suppress glare to detected objects, and second regions surrounding the first regions where light is increased to maintain visibility. This segmentation allows independent optimization of glare suppression and visibility maintenance in different spatial zones, resolving the technical contradiction.
2Illumination intensity
If light is increased in regions surrounding the first regions to maintain visibility, then visibility is improved, but the overlapping region becomes too bright causing driver discomfort
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the light increase rate in the second regions based on the presence and position of detected objects. When second regions overlap, the light increase rate in the overlapping region is set to be lower than the sum of light increase rates in individual second regions, preventing excessive brightness accumulation. This parameter adjustment resolves the contradiction between maintaining visibility and preventing driver discomfort.
3Adaptability or versatility
If the light distribution pattern is dynamically adjusted based on object detection, then adaptability to different driving conditions is improved, but device complexity increases due to control unit and coordination requirements
Solution Approach 1:
The patent merges the control functions for multiple light emitting units into a coordinated system managed by a control unit. The control unit integrates object detection signals and coordinates light distribution adjustments across multiple units, managing complexity through unified control logic that handles region identification, light intensity calculation, and synchronized actuation of light emitting elements.
Data Source
AI summary
A vehicle headlight includes a light unit and a control unit. When the plurality of predetermined objects is located in front of the vehicle, the control unit decreases an amount of light in a first region individually overlapping at least a part of each of the predetermined objects in an ADB light distribution pattern, increases an amount of light in a second region following at least a part of an outer edge of each of the first regions and sets a light increase rate in an overlapping region, in which at least a part of one of two of the second regions and the other of the two second regions overlap each other, to be lower than a sum of a light increase rate in one of the two second regions and a light increase rate in the other of the two second regions.