ADB Headlamp Illumination Gradient Control
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Solution Overview
Problem
Existing vehicle headlamp control systems experience a significant difference in illumination intensity between the light shielding region and adjacent areas, causing discomfort for drivers, especially on curved roads where highly reflective objects are closer, leading to an incongruous light distribution.
Innovation Solution
The system employs a high-beam control unit that adjusts LED illumination intensities using a microcomputer and sensors to maintain a consistent illumination gradient between the light shielding region and adjacent areas, using PWM circuits and a two-dimensional optical deflector to ensure smooth transitions and minimize intensity differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If LED elements are individually controlled to create a light shielding region for preceding vehicles in ADB mode, then glare toward preceding vehicles is suppressed, but a significant difference in illumination intensity between the light shielding region and adjacent areas causes driver discomfort
Solution Approach 1:
The patent applies local quality by differentiating the control strategy for different spatial zones: in the light shielding region, LED elements are turned off to suppress glare, while in adjacent areas, LED elements maintain reference illumination intensity. This spatial differentiation of illumination characteristics resolves the contradiction by locally addressing glare suppression needs without creating excessive brightness contrast that would discomfort the driver.
2Loss of information
If illumination intensity is maintained at reference level in adjacent areas while creating light shielding region, then visibility is maintained, but highly reflective objects on curved roads create strong reflections that amplify the illumination difference and increase driver discomfort
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the illumination intensity parameter of LED elements based on road curvature detection. When a curved road is detected, the system modifies the illumination intensity in adjacent areas to compensate for amplified reflections from highly reflective objects, thereby maintaining visibility while reducing the harmful illumination gradient effect that causes driver discomfort.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
An apparatus for controlling an adaptive drive beam mode vehicle headlamp (47, 52) of a subject vehicle (101) travelling a road (104) includes a headlamp driver (46, 51) adapted to drive the vehicle headlamp (47, 52), a preceding vehicle determining section (411) adapted to determine whether or not a preceding vehicle (102) is travelling ahead of the subject vehicle (101), a road state determining section (413) adapted to determine whether a state of the road (104) is straight or curved, and a curved-mode illumination intensity pattern outputting section (416) adapted to output a curved-mode illumination intensity pattern (Pc) to the headlamp driver (46, 51).