De-icing Vehicle Body Part Using Glass Layer
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Solution Overview
Problem
Existing plastic body parts on motor vehicles, used as radomes for sensors, face inefficiencies in defrosting due to low thermal conductivity and the need to heat the entire thickness of the material, leading to prolonged defrosting times when frost or ice forms, disrupting sensor operations.
Innovation Solution
Incorporating a thin glass layer between the heating tracks and the external surface of the body part, which enhances thermal conductivity and allows for rapid heat transfer to the outer surface, thereby accelerating defrosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heating element is positioned on the inward-facing side of the body panel to protect it from external elements, then the body panel is protected from external elements, but the defrosting time is lengthened due to the need to heat the entire thickness of the panel
Solution Approach 1:
The body panel is segmented into two distinct parts: a plastic body panel providing structural protection and a separate glass layer providing thermal conduction path. This segmentation allows the heating element to be positioned closer to the external surface through the glass layer, enabling rapid defrosting while the plastic panel maintains its protective function.
Solution Approach 2:
A glass layer is introduced as an intermediary between the heating element and the external surface. This glass layer serves as a thermal conductor that allows heat to reach the external surface quickly, while also providing a protective barrier. The glass layer thickness is optimized to balance thermal conduction needs with mechanical protection requirements.
2Reliability
If the bodywork element is made of plastic material with low thermal conductivity, then the material provides good protection and flexibility, but the defrosting time is lengthened due to poor thermal conduction
Solution Approach 1:
The body panel uses a composite structure combining plastic and glass materials. The plastic body panel provides structural protection and flexibility, while the glass layer provides high thermal conductivity for rapid heat transfer. This composite approach allows each material to contribute its advantageous properties to the overall system performance.
3Reliability
If a thick glass layer is used to protect the heating element, then the heating element is well protected, but the thermal conduction efficiency is reduced and defrosting time is lengthened
Solution Approach 1:
The thickness of the glass layer is optimized as a critical parameter. By controlling the glass layer thickness to be within a specific range (e.g., 1-5mm), the system achieves both adequate protection of the heating element and sufficient thermal conduction efficiency for rapid defrosting. This parameter optimization balances competing requirements.
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 use of a thin glass layer between the heating tracks and the external surface of the body part significantly reduces defrosting time and improves safety by maintaining flexibility and preventing glass fragmentation during impacts.
Implementation Method 1
a heating track (32) arranged on the film (30) and capable of converting electrical energy into thermal energy
Implementation Method 2
glass has a much higher thermal conductivity than the plastics used in conventional bodywork components. Therefore, defrosting is also accelerated thanks to the use of glass
Data Source
Figure 1
AI summary
Element (10) for a motor vehicle body part characterized in that it successively comprises a main body (20) made of plastic material, covered at least partially with a film (30) comprising a heating track (32), the film (30) itself being covered at least partially with a layer of glass (40).