Vehicle Headlamp Control for Uniform Lighting Near Streetlights
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Solution Overview
Problem
Existing vehicle headlamps struggle to quickly adjust light intensity distributions in response to ambient conditions, particularly street lighting, leading to inefficient energy use and abrupt changes in illuminance.
Innovation Solution
A control unit adjusts the light source elements based on ambient parameters, dimming or switching off those elements in areas affected by external light sources to maintain uniform illuminance, using distance zones and threshold values to optimize light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all light source elements are controlled uniformly based on ambient parameters, then the light distribution can be adjusted globally, but the illuminance uniformity cannot be maintained when external light sources are present in specific areas
Solution Approach 1:
The patent divides the light source unit into multiple individually controllable light source elements arranged in a matrix, and segments the light distribution into multiple distance zones. This allows selective control of specific light source elements based on their mapping to illumination areas with external light sources, enabling local adjustment while maintaining global adaptability.
Solution Approach 2:
The control unit identifies specific illumination areas where external light sources are present and selectively dims or switches off only the light source elements mapped to those areas. This local quality adjustment maintains illuminance uniformity by compensating for external lighting in specific regions while leaving other areas unchanged.
2Loss of energy
If light source elements are dimmed or switched off to account for external lighting, then energy consumption is reduced, but the response time for lighting adjustment is delayed
Solution Approach 1:
The control unit continuously monitors ambient parameters and proactively adjusts the light source elements before the driver perceives abrupt illuminance changes. By detecting external light sources and pre-adjusting the corresponding light source elements, the system prevents sudden lighting transitions and reduces energy consumption in advance.
Solution Approach 2:
The control unit uses ambient sensors to detect external light sources and continuously feedback this information to adjust the light distribution. This closed-loop control enables rapid response to changing ambient conditions, automatically dimming or switching off light source elements mapped to areas with sufficient external illumination, thereby reducing energy consumption while maintaining appropriate visibility.
3Illumination intensity
If the light distribution is adjusted to compensate for external light sources, then the illuminance uniformity is improved, but the complexity of the control system increases
Solution Approach 1:
The patent segments both the light source unit into individually controllable elements and the light distribution into distance zones. This segmentation allows the control unit to manage complexity by controlling specific elements in specific zones rather than managing all elements globally, simplifying the control logic while achieving uniform illuminance adjustment.
4Loss of energy
If only specific light source elements are controlled based on their mapping to illumination areas with external light, then energy is saved in those areas, but the overall light distribution may become uneven
Solution Approach 1:
The control unit applies local quality adjustment by selectively dimming or switching off only the light source elements mapped to illumination areas where external light sources are detected. This maintains appropriate illuminance levels in externally lit areas while preserving full illumination in areas without external lighting, achieving both energy savings and overall distribution uniformity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for rapid adjustment to varying lighting conditions, ensuring homogeneous illuminance distribution while reducing energy consumption by leveraging external light sources.
Implementation Method 1
an optical unit for mapping the light source elements to a plurality of illumination areas which make up a predetermined light distribution
Data Source
AI summary
The invention relates to a headlamp for vehicles having a light source unit containing a plurality of light source elements for emitting light, an optical unit for mapping the light source elements to form a plurality of illumination areas from which a predetermined light distribution is composed, a control unit for generating a control signal by which the light source elements can be individually controlled depending on an ambient signal, an ambient sensor unit for generating the ambient signal by which ambient parameters in an area in front of the vehicle can be determined. The control unit is configured to generate a control signal dependent on the ambient signal, so that only those light source elements are controlled which are mapped in such a part of the light distribution in which there is a changed illuminance due to a light emitted by an external light source.