Vehicle Headlamp Light Distribution for Curve Glare Control
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Solution Overview
Problem
Existing vehicle headlamp systems fail to optimally adjust light distribution in response to changes in vehicle behavior, leading to glare for preceding vehicles and reduced visibility on curved roads.
Innovation Solution
A control apparatus and method that dynamically adjusts light distribution based on vehicle behavior detection, using sensors to identify light control targets and adjust irradiation patterns to prevent glare by altering luminosity in specific areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dimming control is performed on the inner side of the curve when the own vehicle enters the curve, then glare to preceding vehicles is prevented, but visibility on the inner side of the curve lowers
Solution Approach 1:
The patent applies local quality by differentiating the dimming control strategy based on the position of the preceding vehicle. When the preceding vehicle is detected on the outer side of the curve, dimming is applied to the inner side area. When the preceding vehicle is on the inner side, dimming is applied to the outer side area. This localized approach prevents glare to the specific preceding vehicle while maintaining visibility on the inner side of the curve for the own vehicle driver.
Solution Approach 2:
The patent uses preliminary action by detecting the behavior of the own vehicle (steering angle, lateral acceleration) and proactively adjusting the light distribution pattern before the own vehicle completes the curve entry. The system predicts the curve based on vehicle behavior and applies dimming control in advance, ensuring that when the own vehicle enters the curve, the light distribution is already optimized to prevent glare while maintaining visibility.
2Illumination intensity
If dimming control is started when the own vehicle enters the curve, then the own vehicle's visibility is maintained, but the preceding vehicle experiences glare because it entered the curve earlier
Solution Approach 1:
The patent implements feedback by continuously monitoring the position of the preceding vehicle relative to the curve and adjusting the dimming control accordingly. The system detects whether the preceding vehicle has entered the curve before the own vehicle and dynamically adjusts the light distribution pattern. This feedback mechanism ensures that dimming is applied at the appropriate time and location to prevent glare to the preceding vehicle while maintaining visibility for the own vehicle driver.
Solution Approach 2:
The system performs preliminary detection of vehicle behavior (steering angle, lateral acceleration) to predict curve entry and proactively adjusts the light distribution pattern before the own vehicle completes the curve entry. This allows the system to anticipate when the preceding vehicle may have entered the curve and apply dimming control in advance, preventing glare before it occurs.
3Object-affected harmful factors
If wide-area dimming control is applied on the inner side of the curve, then glare prevention coverage is increased, but visibility on the inner side of the curve is reduced
Solution Approach 1:
The patent applies local quality by precisely targeting the dimming control only to the specific area where the preceding vehicle is located and where glare may occur. Instead of applying wide-area dimming to the entire inner side of the curve, the system adjusts the light distribution pattern to dim only the necessary portions while maintaining illumination in other areas. This localized approach maximizes glare prevention coverage for the specific preceding vehicle while minimizing the impact on overall visibility.
Data Source
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Figure 3A~3C
AI summary
In a vehicle headlamp control apparatus (10), a light distribution control section (140) controls light distribution of a headlamp (70) based on a detected light control target object ahead of a vehicle (SV) and a detected behavior of the vehicle (SV) or an expected change thereof. When the behavior is in a first behavior state in which a change in the headlamp irradiation area becomes equal to or less than a predetermined amount or the behavior is expected not to change from the first behavior state, the light distribution control section (140) causes the headlamp (70) to project light in a standard pattern. When the behavior is in a second behavior state in which the change in the headlamp irradiation area exceeds the predetermined amount or the behavior is expected to change to the second behavior state, the light distribution control section (140) causes the headlamp (70) to project light in a pattern different from the standard pattern.