Motor Vehicle Temperature Sensor Segmented Wire Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Temperature sensors in motor vehicles face challenges in achieving a short response time while minimizing the risk of short circuits, particularly due to chippings caused by friction between rotating parts.
Innovation Solution
The sensor design features the first connecting wire and sensor body in direct contact with the medium for rapid temperature measurement, while the second connecting wire is completely insulated, and both wires are connected to a contact holder for secure signal pickup, with the sensor body optionally sealed in an insulating mass to prevent medium contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If two short connecting legs are used to connect the sensor resistor, then the response time is short due to large surface area contact with the medium, but the risk of short circuit increases due to chippings from friction between rotating parts
Solution Approach 1:
The connecting structure is segmented into two distinct types: the first connecting wire remains exposed to the medium for rapid thermal response, while the second connecting wire is completely insulated to prevent short circuits. This segmentation allows each connecting wire to serve its specific function without compromising the other.
Solution Approach 2:
Different parts of the connecting structure have different properties: the first connecting wire has direct thermal contact with the medium (exposed surface) for fast response, while the second connecting wire has complete insulation for electrical safety. The contact holder also provides localized insulation only where needed for the second connecting wire.
2Reliability
If the sensor body is completely surrounded by insulating mass to prevent short circuits, then protection against short circuits is improved, but the response time increases due to reduced thermal contact with the medium
Solution Approach 1:
The insulating mass is applied locally and selectively - it completely surrounds the second connecting wire for protection, but leaves the first connecting wire and sensor body exposed to the medium for rapid thermal response. This localized insulation approach maintains both safety and performance.
Solution Approach 2:
The insulation strategy is segmented: the sensor body and first connecting wire remain exposed for thermal contact, while only the second connecting wire is surrounded by insulating mass. This segmentation prevents unnecessary insulation that would hinder thermal response.
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 design ensures a quick response to temperature changes with significantly reduced risk of short circuits and allows for efficient signal evaluation, enabling reliable temperature measurement even in hard-to-reach areas.
Implementation Method 1
The increase in temperature of the medium can be transmitted to the sensor by way of the two short connecting legs and simultaneously by way of the lateral surfaces
Implementation Method 2
their electrical resistance drops as the temperature of a component that is embodied from carbon or a semi-conducting material increases. Consequently, the temperature can be ascertained fairly precisely by virtue of measuring the resistance in the area of the high increase. Such materials conduct the current more efficiently when hot rather than when cold, they are therefore also referred to as thermistors or NTC (negative temperature coefficient) resistors
Data Source
AI summary
Arrangement of a sensor for measuring the temperature of a medium in a motor vehicle. The sensor has a sensor body and two connecting wires. The first connecting wire and the major part of the sensor body is in direct contact with the medium. The second connecting wire is completely insulated from the medium.