Vehicle Warning Sign With Thermal and Radar Detection
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Solution Overview
Problem
Existing vehicle warning signs are not effectively detected by sensors in assisted or autonomous driving vehicles, as they do not adequately utilize sensor technologies such as thermal sensors and radar systems.
Innovation Solution
A vehicle warning sign incorporating a reflective material for visible light, a heating element for thermal sensor detection, and a corner reflector for radar detection, oriented in a common direction, along with a support substrate and optional features like a flashing light and metamaterial coatings, to enhance visibility and detection by various sensor modalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional warning triangles are used to make the stopped vehicle more visible to other drivers, then visibility to human drivers is improved, but detection by sensor systems (thermal sensors and radar) is not enhanced
Solution Approach 1:
The warning sign integrates multiple detection targets into a single device: a retroreflector for visible light (human driver visibility), a heating element for thermal infrared detection, and a corner reflector for radar detection. This multi-functional design ensures the warning sign can be detected by various sensor modalities simultaneously, resolving the contradiction between human visibility and sensor detection reliability
Solution Approach 2:
The warning sign combines different materials with distinct properties: retroreflective material for visible light reflection, heating element material for thermal emission, and corner reflector geometry for radar wave reflection. This composite structure enables the single warning sign to interact with multiple types of electromagnetic radiation, achieving both human visibility and sensor system detection
2Reliability
If multiple detection targets are integrated into a single warning sign, then detection coverage across multiple sensor modalities is improved, but device complexity increases
Solution Approach 1:
The patent merges the retroreflector, heating element, and corner reflector into a single integrated warning sign assembly mounted on the vehicle rear. This consolidation achieves comprehensive multi-modal detection coverage while maintaining a unified, manageable structure rather than requiring separate devices for each detection type
Solution Approach 2:
The warning sign is designed as a universal detection target that simultaneously serves multiple functions: reflecting visible light for human visibility, emitting thermal energy for infrared detection, and reflecting radar waves for autonomous vehicle detection. This multi-functionality achieves broad detection coverage without requiring multiple separate devices, thereby managing complexity
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 significantly increases the likelihood of early detection by sensors, improving safety by ensuring that stopped vehicles are recognized by both human drivers and autonomous systems, thereby reducing the risk of collisions.
Implementation Method 1
a retroreflector for reflection of visible light
Implementation Method 2
a heating element for detection by a thermal sensor
Implementation Method 3
a corner reflector for detection by a radar
Data Source
AI summary
A vehicle warning sign comprises: a reflective material for at least visible light; and at least one of (i) a heating element for detection by a thermal sensor or (ii) a corner reflector for detection by a radar, the corner reflector oriented substantially in a common direction with the reflective material.