Adaptive Driving Beam Headlamp Partial Pattern Overlap
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Solution Overview
Problem
Existing adaptive driving beam (ADB) headlamps face challenges in reducing manufacturing costs and forming precise dark zones due to the dense arrangement of light sources, which increases component count and can result in unnecessary dark zones when detecting oncoming or preceding vehicles.
Innovation Solution
The ADB headlamp design incorporates a reduced number of light sources by allowing adjacent partial patterns to partially overlap, forming a greater number of segments than light sources, and uses a light amount controller to adjust light distribution, ensuring a dark zone is formed only in the exact segment where a vehicle is detected, with specific conditions such as vehicle speed and environment considered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a plurality of light sources are densely arranged to prevent partial patterns from being separated, then the dark zone formation is improved, but the number of components increases resulting in increased manufacturing costs
Solution Approach 1:
Adjacent partial patterns from different light sources are merged to overlap and form a unified light distribution pattern. This allows fewer light sources to achieve the same dark zone formation capability that would otherwise require densely arranged light sources, thereby reducing component count while maintaining precision.
Solution Approach 2:
The patent transitions from considering only the spatial arrangement of light sources in one dimension to utilizing the angular distribution and overlapping characteristics of light patterns in multiple dimensions. By controlling the angular spread and overlap of partial patterns, the system achieves precise dark zone formation without requiring dense linear arrangement of light sources.
2Manufacturing precision
If light sources are densely arranged to form precise partial patterns, then the light distribution control is improved, but unnecessary dark zones may be formed when vehicle size is less than the irradiation range
Solution Approach 1:
Instead of turning off entire light sources or partial patterns, the system applies partial action by selectively reducing the intensity of specific light sources or portions of patterns. This allows for graduated dimming that prevents unnecessary complete dark zones while still providing adequate illumination for vehicles smaller than the full irradiation range.
Solution Approach 2:
The system dynamically changes the intensity parameter of light sources based on detected vehicle characteristics. By adjusting brightness levels rather than simply on/off states, the system can adapt the light distribution to match the actual size and position of detected vehicles, preventing unnecessary dark zones while maintaining precise control.
3Ease of manufacture
If the number of light sources is reduced to lower manufacturing costs, then the manufacturing cost decreases, but the ability to form precise dark zones may be compromised
Solution Approach 1:
The light distribution pattern is segmented into multiple partial patterns from different light sources, where each segment contributes to the overall pattern. By strategically arranging fewer light sources and controlling their individual partial patterns to overlap, the system achieves precise dark zone formation capability equivalent to or better than densely arranged light sources, while reducing manufacturing costs.
Data Source
AI summary
An ADB headlamp distributes light having more partial pattern segments than light sources form a dark zone in a segment where a preceding or oncoming vehicle is located is provided. The adaptive driving beam (ADB) headlamp for a vehicle includes first lamp and second lamps having a plurality of light sources. The plurality of partial patterns irradiated from adjacent light sources included in the first and second lamps respectively, partially overlap other to form a first and a second light distribution patterns. The first and second light distribution patterns formed by the first and second lamps partially overlap each other to form a light distribution pattern. The light distribution pattern is divided into a plurality of partial pattern segments that correspond to the location of a sensed vehicle ahead selected from the partial pattern segments. A dark zone is formed by the partial pattern segments by reducing a light source.