Headlamp Monitoring via Cross-Source Detection
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Solution Overview
Problem
High luminance vehicle headlights pose a risk to people and animals due to potential eye irritation and damage, and existing systems lack effective safety measures to differentiate between day, night, and twilight conditions, especially with laser and high-current LED sources.
Innovation Solution
A headlight arrangement with spatially separate monitoring devices for each headlight, where one headlight's monitoring device detects the emission range of the other, using semiconductor light sources like laser activated remote phosphor (LARP) for illumination, and modulation techniques to minimize interference and adjust luminance based on detected objects or people.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high luminance light sources are used in headlights, then road illumination distance and brightness are improved, but photobiological safety deteriorates due to risk of eye irritation and damage to people and animals in the immediate vicinity
Solution Approach 1:
The monitoring function is segmented and distributed to separate headlights rather than using a single common monitoring device. Each headlight has its own monitoring device that independently monitors the emission area of the other headlight, allowing for localized safety control without compromising overall illumination performance
Solution Approach 2:
The monitoring devices provide real-time feedback about objects and people in the emission areas. Based on this feedback, the control unit can dynamically adjust the luminance of the light sources to prevent photobiological damage while maintaining adequate road illumination when safe
2Device complexity
If a common monitoring device is used for both headlights, then device complexity is reduced, but monitoring reliability deteriorates because the monitoring area cannot be sufficiently restricted to the overlapping emission areas
Solution Approach 1:
The monitoring system is divided into separate monitoring devices for each headlight, with each device responsible for monitoring the emission area of the other headlight. This segmentation ensures that each monitoring device only processes relevant data from its designated area, improving reliability through focused monitoring
Solution Approach 2:
Each monitoring device is optimized for its specific monitoring task - monitoring the emission area of the other headlight. This local specialization ensures that each device has the appropriate detection capabilities for its specific region, improving overall system reliability
3Area of stationary object
If the monitoring area is expanded to cover all emission areas, then detection coverage is improved, but false detections increase due to reflections from external surfaces
Solution Approach 1:
The monitoring function is segmented between two separate monitoring devices, each focusing on a specific emission area. This segmentation naturally limits the monitoring scope to only the necessary overlapping areas, preventing false detections from external reflections while maintaining adequate coverage
Solution Approach 2:
Instead of having each headlight monitor its own emission area (which would cause self-interference and false detections), the system inverts the approach by having each monitoring device monitor the emission area of the other headlight, eliminating self-interference issues
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 system reliably detects people and objects in the immediate vicinity, reducing the risk of eye damage by controlling luminance and ensuring safety without disturbing external reflective surfaces, thus enhancing photobiological safety and operational reliability.
Implementation Method 1
a first headlight (1a) having at least one light source (22) for emitting light into an emission area (24) in front of the motor vehicle (30)
Implementation Method 2
a detector unit (12) for detecting people and/or objects (7) in the emission area (24) in front of the motor vehicle (30)
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a headlight (1a; 2a) of a motor vehicle (30). This headlight comprises at least one light source (22) for emitting light into an emission area (24) in front of the motor vehicle (30) and a monitoring device (1b; 2b) for monitoring a monitoring area (9) in front of the motor vehicle (30) and for detecting persons and/or objects (7) in the monitoring area (9). To improve the reliability of the detection, it is proposed that the monitoring device (1b; 2b) includes a detector unit (12) for detecting persons and/or objects (7) in a further emission area (24) of at least one further light source (22) of a further headlight (2a; 1a) in front of the same motor vehicle (30).