Radar Compatible Coating Composition for Autonomous Vehicle Sensors
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Solution Overview
Problem
Current vehicle coatings, intended to provide an aesthetic appearance, often interfere with radar signals by reflecting or absorbing them, limiting the effective detection range of radar systems used in autonomous driving and advanced driver assistance systems.
Innovation Solution
A method and system that use a processor to generate a radar-compatible coating composition by predicting corresponding color and radar properties, ensuring the coating is substantially transmissive to radar signals while maintaining a similar appearance to the target coating, using reflectance measurements and predictive models to modify ingredient compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If aesthetic effect ingredients (metallic, pearlescent) are added to the coating to enhance appearance, then the aesthetic appearance is improved, but the radar signal transmission is blocked or reflected
Solution Approach 1:
The patent removes or extracts the problematic aesthetic effect ingredients (metallic, pearlescent, or other radar-reflective particles) from the coating formulation. By taking out these harmful components while retaining the base coating matrix, the solution achieves radar compatibility without completely sacrificing aesthetic properties, as alternative pigments can provide color without radar interference.
Solution Approach 2:
The patent changes the chemical composition parameters of the coating by substituting radar-reflective ingredients with radar-transparent alternatives. This involves modifying the ingredient list to exclude metallic flakes, pearlescent particles, and other effect ingredients that interfere with radar, while adjusting pigment concentrations to maintain visual appearance. The formulation parameters are optimized to balance aesthetics and radar transmission.
2Reliability
If the coating is made completely transparent to radar by removing all effect ingredients, then radar signal transmission is improved, but the aesthetic appearance is compromised
Solution Approach 1:
The patent applies local quality by allowing different regions or aspects of the coating to have different properties. The coating maintains radar transparency in its bulk composition while using carefully selected pigments and dyes to provide aesthetic coloration. This localized approach to ingredient selection enables specific areas of the spectrum (radar frequencies) to pass through while maintaining visual appeal through non-reflective pigments.
Solution Approach 2:
The patent modifies the formulation parameters by replacing effect ingredients with alternative pigments that provide color without radar reflection. This involves changing the chemical composition to use organic pigments, inorganic powders, or dyes that are radar-transparent yet aesthetically pleasing, thus adjusting the material parameters to satisfy both requirements simultaneously.
3Illumination intensity
If multiple coating layers (primer, basecoat, clearcoat) are applied to achieve desired appearance and protection, then the aesthetic and protective properties are improved, but the complexity of determining radar compatibility increases
Solution Approach 1:
The patent segments the coating system into distinct layers (primer, basecoat, clearcoat) and evaluates each layer's radar compatibility independently. By breaking down the multi-layer system, the method allows for targeted formulation optimization in each layer, identifying which layers contain problematic ingredients and which can be simplified. This segmentation reduces the overall complexity by focusing modifications on specific layers rather than the entire coating system.
Solution Approach 2:
The patent changes the formulation parameters of individual coating layers to achieve radar compatibility. By adjusting the ingredient composition, pigment selection, and thickness parameters of specific layers, the method simplifies the determination of radar compatibility while maintaining the aesthetic function of each layer. This parameter optimization approach reduces complexity by providing a systematic way to evaluate and modify each layer's contribution to overall radar performance.
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 enables radar signals to be transmitted with minimal loss, enhancing the detection range of radar systems while maintaining the aesthetic appearance of the coating, with the radar-compatible coating composition achieving up to 90% transmission through the designated medium.
Implementation Method 1
The radar typically used in motor vehicles for detecting objects is 77 giga hertz (GHz) band radar, which describes a category of radar that includes frequencies from about 76 to 81 GHz (e.g., W Band). The transmission of radar through a typical bumper substrate and the coating layers thereon is therefore important for the effective operation of many vehicle radar systems.
Implementation Method 2
obtain a reflectance measurement of a target coating to characterize a color of the target coating
Data Source
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Figure 3A~3C
AI summary
Methods and systems for determining a radar compatible coating are provided. In one example, the method includes obtaining a reflectance measurement of a target coating to characterize a color of the target coating. One or more candidate formulas are generated to determine color matching to the color of the target coating. A corresponding color and a corresponding radar property for each of the one or more candidate formulations is predicted. A radar compatible coating composition that is the same or substantially similar in appearance to the target coating is generated. Generating the radar compatible coating composition is based at least in part on the corresponding color and the corresponding radar property for one of the one or more candidate formulations.