Adaptive Vehicle Headlight Control for Road Gradient Illumination
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Solution Overview
Problem
Existing vehicle headlight systems fail to optimally adjust light output based on the vertical course of the roadway, leading to inadequate illumination and potential dazzling of other road users due to shifting light-dark boundaries.
Innovation Solution
A method and device that detect the vertical course of the roadway using a combination of navigation data and camera-based image processing, adjusting the headlight range and aperture settings of xenon headlights with a VarioX shutter shaft to maintain optimal illumination and prevent dazzling, by determining the target distance and gradient of the roadway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the beam angle of the headlight is changed by pivoting the headlight to position the cut-off line at a desired target angle, then the illumination range is improved, but when the road rises or falls, the light-dark boundary shifts and the area in front of the vehicle is not illuminated as desired
Solution Approach 1:
The headlight system dynamically adjusts the beam angle by pivoting the headlight based on detected road gradient. The control unit receives gradient information from the navigation system and automatically changes the headlight orientation to maintain optimal illumination on ascending or descending roads, transforming a static lighting system into an adaptive one.
Solution Approach 2:
The system uses feedback from the navigation system's road gradient data to continuously monitor and adjust the headlight position. The control unit processes gradient information and sends adjustment commands to the headlight pivot mechanism, creating a closed-loop control system that maintains proper light-dark boundary positioning despite road slope changes.
2Illumination intensity
If the light output is increased to illuminate uphill road, then the illumination range is improved, but other road users may be dazzled
Solution Approach 1:
The system applies different aperture settings to different regions of the light beam. When illuminating uphill roads, the aperture arrangement selectively opens higher angles to direct light upward toward the slope, while maintaining restricted illumination in horizontal directions where other road users might be affected. This creates localized illumination quality tailored to the specific road geometry.
Solution Approach 2:
The control unit dynamically changes the aperture parameters based on road gradient and distance to vehicles ahead. By adjusting the aperture opening angles and positions in response to detected conditions, the system optimizes light distribution to illuminate uphill sections while preventing excessive light spread that could dazzle other road users.
3Adaptability or versatility
If a camera and navigation system are used to detect the vertical course of the roadway, then the adaptability to road gradient is improved, but the device complexity increases
Solution Approach 1:
The navigation system performs multiple functions: it provides positioning information, route guidance, and now also supplies road gradient data for headlight control. By reusing the existing navigation system's computational resources and data processing capabilities, the system avoids adding dedicated gradient detection hardware, thereby reducing overall complexity while maintaining adaptability.
Solution Approach 2:
The control unit acts as an intermediary that receives road gradient information from the navigation system and translates it into headlight adjustment commands. This mediator component integrates the navigation data with the headlight control system, enabling gradient-based adaptation without requiring direct coupling between the camera/navigation system and the headlight mechanism.
Data Source
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AI summary
The method involves determining the vertical course of the roadway (12) and adapting the light output to the determined course of the roadway. The vertical course of the roadway is determined in the region to be illuminated in front of the vehicle (14) and/or in the region to be illuminated with at least one headlamp (20, 22) : An independent claim is also included for an arrangement for controlling the light output of a vehicle depending on the course of a roadway.