Adaptive Headlamp Beam Control for Corner Illuminance Uniformity
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Solution Overview
Problem
The use of adaptive driving beams (ADB) in vehicles results in triangular shape illuminance unevenness at the corners of the light dimming range due to the difference in relative angles between the left and right lamps, causing discomfort to drivers.
Innovation Solution
A control apparatus and method that utilizes left and right variable light distribution units to set overlapping light dimming ranges and correction lights at the corners of the combined light dimming range, adjusting based on the position of an object in front of the vehicle to minimize illuminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If light dimming range is set for object to be dimmed using ADB function, then high beam can be maintained outside light dimming range, but illuminance unevenness causes driver discomfort
Solution Approach 1:
The invention addresses driver comfort by locally enhancing illumination at the corner regions where illuminance unevenness occurs. By adding correction lights specifically at these problematic areas, the system maintains the ADB function's ability to preserve high beam outside the dimming range while locally correcting the unevenness that causes driver discomfort.
2Illumination intensity
If correction lights are added at corners of light dimming range, then illuminance unevenness is reduced, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the light distribution system into two functional parts: the main ADB light dimming range control and the corner correction light system. This segmentation allows the correction lights to be independently controlled and optimized for their specific purpose of reducing illuminance unevenness at corners, without interfering with the overall ADB function. The segmented approach manages complexity by creating modular, independently controllable lighting zones.
Data Source
AI summary
A control apparatus for a headlamp in which irradiation lights of a left-side variable light distribution unit and a right-side variable light distribution unit are overlapped to form a combined irradiation light in front of a vehicle, where the control apparatus performs: to set a first and a second light dimming ranges in the irradiation range of each of the left-side and right-side variable light distribution units according to an object position; to set irradiation ranges of a first and a second correction light at the left and right corners of the lower end of a combined light dimming range configured to include the first and second light dimming ranges; and to provide control signals to the left-side and right-side variable light distribution units to realize the combined irradiation light including the first and second light dimming ranges, and the irradiation ranges of the first and second correction light.