Conductive Glue Shielding for Steering Wheel Hands-On Sensors
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Solution Overview
Problem
Existing hands-on detection sensors in vehicles face interference from noise sources like heaters and other controls in the steering wheel, which affects their accuracy and requires additional shielding layers, increasing complexity and weight.
Innovation Solution
The use of electrically conductive glue as a shield between the heater wire and sensor wire carriers in the steering wheel, which provides both bonding and shielding, eliminating the need for additional layers and improving signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional non-conductive adhesive is used to bond heater and sensor wires in the steering wheel, then the steering wheel components can be assembled, but electrical noise from the heater interferes with the sensor signal, reducing detection accuracy
Solution Approach 1:
An electrically conductive adhesive layer is introduced as an intermediary between the heater wire and the capacitive sensor. This adhesive serves as a shield that grounds electrical noise from the heater, preventing it from interfering with the sensor signal while still providing the necessary bonding function.
Solution Approach 2:
The electrically conductive adhesive converts the harmful electrical noise from the heater into a beneficial shielding effect. By being conductive, the adhesive actively grounds the noise, transforming what would be interference into a protective mechanism that enhances sensor accuracy.
2Measurement precision
If additional shielding layers are added between heater and sensor wires to reduce noise interference, then signal-to-noise ratio improves, but device complexity and weight increase
Solution Approach 1:
The electrically conductive adhesive performs multiple functions simultaneously: it provides electrical bonding between components, acts as an electrostatic shield to ground noise, and serves as the adhesive layer itself. This multi-functionality eliminates the need for separate shielding layers, reducing overall device complexity.
Solution Approach 2:
The shielding function is merged with the adhesive function in a single electrically conductive layer. Instead of having separate adhesive and shielding layers, the conductive adhesive combines both roles into one component, simplifying the overall structure.
3Object-affected harmful factors
If multiple separate layers (adhesive and shielding) are used between heater and sensor, then noise shielding is provided, but manufacturing steps and fabrication time increase
Solution Approach 1:
The electrically conductive adhesive performs multiple functions simultaneously: it provides electrical bonding between components, acts as an electrostatic shield to ground noise, and serves as the adhesive layer itself. This multi-functionality eliminates the need for separate shielding layers, reducing overall device complexity.
Solution Approach 2:
The shielding function is merged with the adhesive function in a single electrically conductive layer. Instead of having separate adhesive and shielding layers, the conductive adhesive combines both roles into one component, simplifying the overall structure.
4Device complexity
If electrically conductive glue is used between wire carriers, then noise shielding and bonding are achieved in one layer, but the adhesive must be electrically conductive which limits material choices
Solution Approach 1:
The electrical conductivity parameter of the adhesive is changed from non-conductive (traditional) to conductive. This parameter change enables the adhesive to provide shielding functionality while maintaining bonding capabilities, though it does limit material choices to conductive adhesives.
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 approach enhances the sensitivity of capacitive sensing by reducing noise interference and temperature effects, providing reliable hands-on detection while reducing sensor thickness and fabrication time.
Implementation Method 1
The use of electrically conductive glue as a shield between the heater wire and sensor wire carriers in the steering wheel, which provides both bonding and shielding
Implementation Method 2
The electrically conductive glue is disposed between the heater wire carrier and the sensor wire carrier
Data Source
AI summary
A heater/sensor assembly to perform heating of a surface and proximity sensing comprises a heater wire, a sensor wire, and an electrically conductive glue. The heater wire is disposed on a heater wire carrier. The heater wire carrier is electrically non-conducting. The sensor wire is disposed on a sensor wire carrier. The sensor wire carrier being electrically non-conducting. The electrically conductive glue is disposed between the heater wire carrier and the sensor wire carrier.