Conductive Polymer Heater for Exterior Vehicle Interface De-icing
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Solution Overview
Problem
Exterior human-machine interfaces on motor vehicles, such as B-pillar appliques, are prone to icing and snow accumulation, which can hinder functionality and user access, especially in cold weather conditions, and existing solutions do not efficiently address this issue while being cost-effective and easy to manufacture.
Innovation Solution
A heater assembly using a conductive polymer, filled with electrically conductive fillers like glass, carbon nanostructures, or graphene, is integrated into the human-machine interface to selectively thermally condition the area, preventing ice and snow formation, and is controlled by a sensor-activated system that manages heat dissipation and transfer effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional heating element is used to prevent icing on the exterior human-machine interface, then the interface can be kept de-iced, but the cost increases and manufacturing complexity increases
Solution Approach 1:
The patent changes the physical-chemical parameters of the polymer material by incorporating electrically conductive fillers (such as carbon black, metal particles, or conductive polymers) to transform it from an insulating material to an electrically conductive heating element. This allows the same polymer cover to serve dual functions: structural protection and active heating to prevent icing.
Solution Approach 2:
The patent creates a composite material by combining polymer matrix with electrically conductive fillers. This composite structure integrates the heating function directly into the cover material, eliminating the need for separate traditional heating elements and reducing manufacturing complexity while maintaining reliability in cold weather conditions.
2Ease of operation
If a heater is integrated into the human-machine interface to prevent ice and snow accumulation, then the interface remains accessible, but heat transfer to unintended areas may occur
Solution Approach 1:
The patent applies local quality by concentrating the heating function specifically at the human-machine interface area where buttons and sensors are located. The conductive polymer heater is integrated into the cover material at this specific location, providing localized thermal conditioning only where needed, rather than heating the entire vehicle body or surrounding areas.
Solution Approach 2:
The polymer cover itself acts as an intermediary between the heating element and the external environment. It serves as both the structural cover and the heating medium, directly transferring heat to the interface components (buttons, sensors) while isolating the heat source from unintended areas through its inherent thermal properties and geometric configuration.
3Reliability
If high current is used to heat the human-machine interface effectively, then ice and snow are prevented, but energy consumption increases
Solution Approach 1:
The patent optimizes the electrical parameters of the heating system by carefully selecting the conductivity of the polymer composite and the geometry of the heating path. By adjusting the filler concentration and distribution in the polymer matrix, the system achieves effective heating at lower current levels compared to traditional high-power heating elements.
Solution Approach 2:
The patent utilizes the thin-film nature of the polymer cover to create an efficient heating structure. The conductive polymer layer acts as a thin-film heater that distributes heat uniformly across the interface area with minimal energy input, leveraging the large surface area to volume ratio to achieve effective de-icing at low power consumption.
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 effectively keeps the human-machine interface de-iced and dry, efficiently spreading heat without high current requirements, while being low-cost and easy to manufacture, and incorporates thermal management features to prevent heat transfer and dissipate heat as needed.
Implementation Method 1
The heater includes a conductive polymer... efficiently spreading heat without high current requirements
Implementation Method 2
The conductive polymer is a polymer material filled with electrically conductive fillers... efficiently spreads heat
Implementation Method 3
a sensor configured to generate a signal indicative of a temperature of the human-machine interface
Data Source
AI summary
This disclosure relates to a motor vehicle including a heater for an exterior interface. An example assembly includes a human-machine interface adjacent an exterior of the motor vehicle, and a heater configured to selectively thermally condition the human-machine interface. The heater includes a conductive polymer. A method is also disclosed.