Headlamp Beam Pattern Adjustment for Glare Reduction
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Solution Overview
Problem
Current headlamp systems struggle to balance illumination and glare control, particularly when encountering oncoming or leading vehicles, as high beams provide insufficient control of light direction, leading to excessive glare for other drivers.
Innovation Solution
A method and system that utilize a camera and electronic controller to detect oncoming vehicles and adjust the headlamp beam pattern by turning off or dimming specific LED segments, shifting from a high beam to a reduced-glare beam pattern to minimize glare, while maintaining low beam illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high beam illumination is used to provide wide visibility for the driver, then illumination intensity is improved, but glare to other road users increases
Solution Approach 1:
The headlamp assembly is divided into multiple independently controllable segment arrays (first, second, third, and fourth segment arrays) that can be selectively activated or deactivated. This segmentation allows the system to generate different beam patterns (high beam, low beam, or intermediate patterns) by controlling specific segments, thereby providing wide visibility when needed while reducing glare to other road users when vehicles are detected.
2Illumination intensity
If high beam is used when the host vehicle is alone on the road, then forward visibility is improved, but glare to oncoming vehicles occurs when vehicles are present
Solution Approach 1:
The system uses a camera to continuously monitor the road environment and detect other vehicles. Based on this feedback information, the electronic controller dynamically adjusts the headlamp beam pattern by selectively controlling which segment arrays are activated. When no vehicles are detected, high beam provides maximum forward visibility; when vehicles are detected, the system switches to appropriate beam patterns to eliminate glare while maintaining adequate illumination.
Data Source
AI summary
A method includes generating a first beam pattern via a headlamp assembly arranged on a motor vehicle and detecting, via a camera, an object in the first light beam pattern. The method additionally includes receiving, via an electronic controller, a signal from the camera indicative of the object, identifying the object as another motor vehicle, and determining a distance between the headlamp assembly and the other vehicle. The method also includes determining a first amount of glare the first beam pattern generates to the other vehicle at the determined distance and identifying when the first amount of glare exceeds target glare. The method further includes identifying a second beam pattern corresponding to a second amount of glare that is below the target glare and switching the headlamp assembly from generating the first beam pattern to generating the second light beam pattern.