Thermally Conductive Insulating Covering for Motor Vehicle Temperature Sensor
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Solution Overview
Problem
Temperature sensors in motor vehicles face challenges in achieving short response times while minimizing the risk of short circuits, particularly due to metal chips generated by friction between rotating parts.
Innovation Solution
A sensor arrangement with a thermally conductive covering that surrounds the sensor body and connection wires, enhancing thermal conductivity and electrical insulation to reduce short-circuit risks and improve response times, using materials like thermosetting plastics with fillers for increased thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the sensor body is directly surrounded by medium with large heat transmission area, then the response time is short, but the risk of short circuit between connection legs is high
Solution Approach 1:
The patent introduces a covering made of thermally conductive and electrically insulating material as an intermediary between the sensor body/connection legs and the medium. This covering allows thermal energy to pass through (maintaining short response time) while blocking electrical conduction from metal chips (reducing short circuit risk). The covering acts as a mediator that selectively transmits heat while isolating electrical components.
Solution Approach 2:
The patent employs composite materials with specific properties: thermally conductive and electrically insulating characteristics. The covering material is described as having high thermal conductivity while maintaining electrical insulation, creating a composite structure that simultaneously addresses both thermal response and electrical protection requirements.
2Reliability
If an electrically insulating covering is used to protect against short circuits, then the short circuit risk is reduced, but the thermal conductivity and response time are degraded
Solution Approach 1:
The patent changes the thermal conductivity parameter of the insulating covering by adding thermally conductive fillers. The covering material's thermal conductivity is enhanced from typical insulating levels to specifically high values (e.g., aluminum powder additions), allowing it to maintain electrical insulation while achieving sufficient thermal conduction for rapid response.
Solution Approach 2:
The patent creates a composite covering material combining electrically insulating base material with thermally conductive fillers. This composite structure maintains the electrical insulation properties needed for protection while introducing thermal conduction pathways through the filler particles, resolving the contradiction between insulation and heat transfer.
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 significantly reduces the risk of short circuits and enhances response times by ensuring effective thermal conductivity and electrical insulation, allowing for rapid temperature measurement with improved protection against metal chip-induced short circuits.
Implementation Method 1
the sensor body is in thermally conductive contact with the medium by means of the connection wires and the surrounding covering
Implementation Method 2
when a sensor component which is composed of carbon or a semiconductor material is heated, the electrical resistance of said sensor component falls. Therefore, the temperature can be determined fairly accurately by measuring the resistance
Data Source
AI summary
A sensor arrangement for measuring the temperature of a medium in a motor vehicle. The sensor has a sensor body and two connecting wires and is completely insulated from the medium. The sensor body is electrically insulated by the medium by way of a covering completely surrounding the sensor body, and is in heat-conducting contact with the medium by way of the connecting wires and the surrounding covering.