Motor Vehicle Seat Faraday Cage for Electromagnetic Shielding
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Solution Overview
Problem
The increasing number of electronic and electrotechnical devices in motor vehicles generates electromagnetic interference that disrupts the operation of devices within the passenger compartment, particularly due to the growing trend of automation and electric vehicles.
Innovation Solution
A motor vehicle seat with a metal frame that is electrically connected to the vehicle's chassis to create a Faraday effect, incorporating an electronic control unit and power cable within the seat volume, ensuring direct contact between the cable and frame for a significant length to minimize electromagnetic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple electronic and electrotechnical devices are installed in the motor vehicle, then the functionality and automation level of the vehicle is improved, but electromagnetic interference is generated that disrupts the operation of devices
Solution Approach 1:
The seat is divided into multiple electrically conductive segments (backrest frame, seating portion frame, rails) that work together to form a complete Faraday cage. Each segment is independently electrically connected to the vehicle chassis, creating a segmented but continuous shielding structure that contains electromagnetic interference within the seat volume while preserving device functionality.
Solution Approach 2:
The metal frame structure of the seat acts as an intermediary between the electronic devices and the external environment. By electrically connecting this frame to the vehicle chassis, it creates a Faraday effect that mediates electromagnetic interference, allowing devices to operate within the seat volume without generating harmful emissions outward.
2Object-generated harmful factors
If the metal frame is electrically connected to the chassis to generate a Faraday effect, then electromagnetic radiation is reduced outside the seat volume, but the electrical connection requirements increase
Solution Approach 1:
The electrical connection structure is merged with the existing seat frame and rail assembly. The same metal components that provide structural support (backrest frame, seating portion frame, rails) are also used as the electrical connection path to the chassis, eliminating the need for separate shielding structures and reducing overall system complexity.
Solution Approach 2:
The metal frame and rails serve dual functions: providing structural support for the seat and simultaneously acting as electrical conductors for the Faraday effect. This multi-functionality reduces the number of separate components needed, as the structural elements also fulfill the electromagnetic shielding requirement.
3Object-generated harmful factors
If the power cable is in contact with the metal frame for a significant length, then electromagnetic interference is minimized, but the installation complexity increases
Solution Approach 1:
The cable is made to contact the metal frame over an extended length, creating an equipotential connection that minimizes electromagnetic interference. This extended contact ensures the cable and frame are at the same electrical potential along the contact zone, reducing radiation while the integration with existing structures keeps installation manageable.
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
This configuration significantly reduces or eliminates electromagnetic radiation outside the seat volume, protecting the operation of vehicle devices and ensuring normal functioning.
Implementation Method 1
the seat defining a volume, said frame being configured to be electrically connected to a chassis of the motor vehicle so as to generate a Faraday effect
Data Source
AI summary
A motor vehicle seat having a metal frame, the seat defining a volume (V). The frame is configured to be electrically connected to a chassis of the motor vehicle so as to generate a Faraday effect. The seat includes an electronic and/or electrotechnical device having at least one electronic control unit and/or a motor connected to a power cable. The cable is intended for connection to a power supply of the motor vehicle for the at least one electronic control unit and/or motor. The electronic and/or electrotechnical device is at least partially arranged within the volume (V) of the seat.