Vehicle Headlamp Light Distribution Control for Curved Roads
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Solution Overview
Problem
Existing light distribution controlling systems for vehicle headlamps face challenges in coordinating adaptive front-lighting system (AFS) and adaptive driving beam (ADB) controls, leading to discomfort for drivers when navigating curved roads, as the swivel controls often conflict, resulting in inappropriate light distribution and reduced visibility.
Innovation Solution
A light distribution controlling apparatus that integrates AFS and ADB controls by using a configuration with left and right headlamps, where the AFS controlling module calculates and applies a swivel angle to align the headlamps' irradiation direction with the vehicle's travel direction, and an offset processing module adjusts the detected vehicle position based on this angle to determine optimal light distribution patterns, preventing glare and enhancing visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ADB control swivels the light distribution to follow the relative positional change of the oncoming vehicle, then glare to the front vehicle is prevented, but the headlamp irradiation direction becomes mismatched with the traveling direction causing driver discomfort
Solution Approach 1:
The patent divides the headlamp beam into multiple local light distribution regions (first light distribution region and second light distribution region) with different characteristics. The first region provides standard illumination while the second region provides enhanced illumination at higher angles. This local differentiation allows the system to selectively illuminate specific areas without causing glare to oncoming vehicles, thereby resolving the contradiction between preventing glare and maintaining driver comfort.
Solution Approach 2:
The patent dynamically adjusts the light distribution pattern based on the relative position of the oncoming vehicle. When an oncoming vehicle is detected, the system selectively activates and positions the second light distribution region according to the vehicle's angular position. This dynamic adaptation allows the headlamp to follow the oncoming vehicle's position to prevent glare while maintaining appropriate illumination for the driver, thus resolving the contradiction.
2Illumination intensity
If both AFS control and ADB control are applied to the headlamp, then visibility in the traveling direction is improved, but the swivel angles of both controls conflict making coordination difficult
Solution Approach 1:
The patent segments the light distribution control into distinct functional regions - a first light distribution region for standard illumination and a second light distribution region for enhanced illumination. Each region can be independently controlled and positioned. This segmentation allows the AFS and ADB controls to operate on different segments without conflict, simplifying the overall control coordination while maintaining improved visibility in the traveling direction.
Solution Approach 2:
The patent introduces a vertical dimension to light distribution by creating light distribution regions at different angles above the horizontal plane. The second light distribution region is positioned at a higher angle than the first region, adding a vertical component to the traditionally horizontal light distribution. This dimensional change allows both AFS (horizontal swivel) and ADB (vertical shading) to operate independently in different dimensions, eliminating control conflicts while improving visibility.
Data Source
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AI summary
A light distribution controlling apparatus of a vehicle headlamp is provided with: an ADB controlling module (104) configured to detect a vehicle position of a front vehicle (CAR) in front of an own vehicle and to switch light distribution of the vehicle headlamp based on the detected vehicle position; an AFS controlling module (101) configured to swivel-control an irradiation direction of the vehicle headlamp depending on a change of a traveling direction of the own vehicle; and an offset module (103) configured to offset said vehicle position adopted in the ADB controlling module (104) depending on a swivel angle controlled by the AFS controlling module (101).