Adaptive Driving Beam Headlamp Glare Prevention
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Solution Overview
Problem
Conventional adaptive driving beam (ADB) headlamp systems face challenges in accurately calculating a no-glare zone, leading to potential glare for oncoming vehicles due to insufficient precision in determining the position and movement of nearby vehicles.
Innovation Solution
The ADB headlamp system employs a processing unit, camera, and specific calculations to determine the coordinates and relative velocity of nearby vehicles, distinguishing between different movement conditions to accurately project a dimmed area within the high beam pattern, thereby preventing glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the headlamp emits high intensity light beams in high beam mode, then the visibility for the driving vehicle is improved, but glare is caused to drivers of nearby vehicles
Solution Approach 1:
The patent applies local quality by creating a no-glare zone with specific coordinates (X, Y) and dimensions in the headlamp beam pattern. The processing unit selectively dims only the portion of the high beam pattern that would project onto nearby vehicles, while maintaining full intensity in other areas. This localized modification allows the headlamp to provide high illumination where needed while preventing glare in specific directional zones where nearby vehicles are detected.
2Object-affected harmful factors
If the ADB system dims a large portion of the high beam pattern to prevent glare, then glare prevention is improved, but visibility for the driving vehicle is reduced
Solution Approach 1:
The system precisely defines the no-glare zone using coordinate calculations based on nearby vehicle position, relative velocity, and predicted moving area. Only the specific angular sector corresponding to this calculated zone is dimmed, while the rest of the headlamp pattern maintains full intensity. This selective approach ensures maximum visibility for the driving vehicle while providing targeted glare prevention.
3Speed
If the system calculates the no-glare zone based only on current vehicle position, then the calculation speed is improved, but the accuracy of glare prevention is reduced
Solution Approach 1:
The processing unit performs preliminary calculations to predict the future position of nearby vehicles by considering their current position, relative velocity, and estimated moving area. The no-glare zone is calculated based on this predicted future position rather than just the current position, allowing the system to proactively adjust the headlamp pattern before glare would occur. This preliminary action maintains calculation speed while significantly improving the accuracy and effectiveness of glare prevention.
Data Source
AI summary
An operation method of an adaptive driving beam headlamp system includes: in response to receipt of a sequence of images, when it is determined that a nearby vehicle is in the sequence of images, determining whether the nearby vehicle is in a first condition moving in a direction opposite to a moving direction of a driving vehicle and approaching the driving vehicle, or is in a second condition moving ahead of the driving vehicle in the moving direction of the driving vehicle; calculating a area into which the nearby vehicle is projected to move based on whether the nearby vehicle is in the first or the second condition; and controlling a headlamp to dim a part of a high beam pattern that corresponds with the area.