Variable Light Distribution Lamp Cutoff Line Control
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Solution Overview
Problem
Existing vehicle lamp systems fail to provide optimal light distribution for vehicles driving on hill roads, leading to insufficient visibility due to glare issues on oncoming vehicles or inadequate illumination of preceding vehicles.
Innovation Solution
A vehicle lamp system with a variable light distribution lamp and gaze tracking device, controlled by a controller to adjust the cutoff line based on driver's line of sight and road conditions, allowing independent control of light distribution patterns to enhance visibility on hill roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cutoff line height is shifted above the H-line at the start point of an uphill road to illuminate the preceding vehicle, then the field of view is improved, but glare is caused on the oncoming vehicle
Solution Approach 1:
The patent divides the light distribution control into separate zones: the cutoff line height on the vehicle lane side (left side in LHT) is independently adjusted upward to illuminate the preceding vehicle, while the cutoff line height on the oncoming lane side (right side in LHT) is maintained at the standard H-line position to prevent glare. This segmentation allows simultaneous achievement of both illumination and glare prevention
Solution Approach 2:
The patent applies different light distribution characteristics to different lateral zones of the headlight output. The left side (vehicle lane side) has elevated cutoff line to provide enhanced illumination for uphill driving, while the right side (oncoming lane side) maintains standard cutoff line height to avoid causing glare to oncoming traffic
2Object-affected harmful factors
If the cutoff line height is shifted below the H-line at the end point of an uphill road to suppress glare on the oncoming vehicle, then glare is reduced, but the preceding vehicle is not illuminated
Solution Approach 1:
The patent segments the light distribution control by lateral position, allowing the vehicle lane side (left side in LHT) to maintain elevated cutoff line height for continuous illumination of the preceding vehicle, while the oncoming lane side (right side in LHT) adjusts cutoff line height downward to suppress glare when approaching the end of an uphill section
Solution Approach 2:
The patent implements dynamic adjustment of cutoff line heights based on real-time detection of road gradient changes. When the vehicle approaches the end point of an uphill road, the system dynamically lowers the cutoff line height on the oncoming lane side to prevent glare, while maintaining or adjusting the vehicle lane side height to ensure continuous illumination of the preceding vehicle
3Object-affected harmful factors
If the low beam light distribution is regulated to suppress glare on oncoming vehicles on a flat road, then glare is reduced, but visibility on hill roads becomes insufficient
Solution Approach 1:
The patent employs dynamic light distribution adjustment based on detected road gradient. When an uphill road is detected, the system dynamically elevates the cutoff line height on the vehicle lane side to improve visibility for the preceding vehicle, while maintaining appropriate glare suppression on the oncoming lane side. This dynamic adaptation allows the system to optimize for hill road conditions without permanently compromising glare control
Solution Approach 2:
The patent changes the light distribution parameters (cutoff line heights) based on road conditions. On flat roads, standard cutoff line heights are used to suppress glare. When uphill roads are detected, the cutoff line height on the vehicle lane side is increased to improve visibility, while the oncoming lane side maintains or reduces its cutoff line height to prevent glare
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
The variable light distribution lamp 110 is structured to generate a low beam light distribution in which a height of a cutoff line is controllable. A gaze tracking device 208 detects a driver's line of sight. A controller 130 changes a height of the cutoff line, by controlling the variable light distribution lamp 110, based on the driver's line of sight detected by the gaze tracking device 208.