Vehicle Traffic Light Absorber Device for Reliable Signal Detection
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Solution Overview
Problem
Current traffic light signal detection systems, especially those using optical and camera-based methods, are unreliable in adverse weather conditions and unsuitable for autonomous driving due to high failure probabilities and limited ability to identify signal installations.
Innovation Solution
An absorber device with apertures that can be opened and closed using a reliable mechanism, allowing electromagnetic sensor systems to differentiate between signal states by reflecting or absorbing electromagnetic waves, enabling reliable identification of traffic light signals by electromagnetic sensor systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If camera-based or optical systems are used to detect traffic light signals, then the system can identify signal colors, but the reliability deteriorates under adverse weather conditions and atmospheric interference
Solution Approach 1:
The patent replaces optical/camera-based detection systems with electromagnetic sensor systems (radar, lidar) that emit and detect electromagnetic waves. This substitution eliminates dependence on visible light transmission through the atmosphere, making signal detection immune to weather conditions like fog, rain, and darkness that adversely affect optical systems.
Solution Approach 2:
The invention changes the detection parameter from optical wavelength (visible light) to electromagnetic wave frequency (radar/lidar frequencies). By operating at different electromagnetic frequencies that penetrate atmospheric interference better, the system achieves reliable detection independent of weather conditions while maintaining the ability to distinguish signal states through absorption patterns.
2Reliability
If conventional traffic lights are used, then the system can display signal colors, but electromagnetic sensor systems cannot reliably identify the signal installation
Solution Approach 1:
The patent applies frequency-selective absorption materials to the traffic light housing that exhibit different absorption characteristics at different electromagnetic frequencies. When illuminated by the electromagnetic sensor system, these materials create distinct absorption patterns corresponding to different signal states (red, yellow, green), enabling reliable identification by the sensor system without requiring visual color detection.
Solution Approach 2:
The invention creates an electromagnetic signature copy of the visual traffic light signals. Instead of relying on optical color detection, the system translates visual signal states into electromagnetic absorption patterns that can be detected and interpreted by electromagnetic sensors, effectively copying the information in a format suitable for autonomous vehicle sensors.
3Reliability
If aperture closures are used to represent signal states, then the system can display traffic light signals, but the device complexity increases
Solution Approach 1:
The patent integrates multiple functions into the aperture closure system: it serves as both a visual occluder for traditional light visibility and an electromagnetic absorption element for sensor detection. The same mechanical structure that blocks visible light also modulates electromagnetic wave absorption, eliminating the need for separate mechanisms and reducing overall system complexity despite the added functionality.
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 absorber device allows electromagnetic sensor systems to reliably identify traffic light signals independently of weather conditions, reducing the likelihood of misinterpretation and enhancing safety for autonomous driving and conventional driver assistance systems.
Implementation Method 1
when the aperture is closed, electromagnetic waves impinging thereon are reflected
Implementation Method 2
when the aperture is open, electromagnetic waves arriving through the aperture do not leave the absorber device again
Data Source
AI summary
An absorber device for electromagnetic sensor systems has at least one aperture. Each aperture is able to be opened and closed by an aperture closure. The absorber device is designed in such a way that when the aperture is open, electromagnetic waves incoming through the aperture do not then leave the absorber device, and when the aperture is closed, electromagnetic waves impinging on the aperture are reflected.