Vehicle Heater Sensor Layer for Local Overheating Detection
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Solution Overview
Problem
Existing vehicle heaters with non-intrinsically safe heat conductor layers face challenges in detecting isolated or local temperature threshold exceedances without compromising heat conductivity, as traditional sensor integration methods are costly, labor-intensive, and can be inaccurate due to heat transfer issues and sensor placement limitations.
Innovation Solution
A vehicle heater design featuring a sensor layer arranged on the side of the heat conductor layer facing away from the main body, allowing for current flow monitoring in the direction of its surface normal, which is produced using thermal spraying methods to maintain optimal heat conductivity and detect small-scale overheating without a heat sink effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor layer is provided between the main body and the heat conductor layer to detect temperature threshold exceedances, then the detection capability is improved, but the heat transfer from the heat conductor layer to the main body is deteriorated
Solution Approach 1:
The sensor layer is extracted from the heat transfer path between the main body and heat conductor layer. Instead of being positioned between these components, the sensor layer is arranged on the side of the heat conductor layer facing away from the main body, allowing temperature detection without interfering with heat transfer efficiency.
2Reliability
If the main body is used as a heat sink for the sensor layer to prevent overheating, then safety is improved, but the detection accuracy of small or isolated overheated areas is reduced
Solution Approach 1:
Instead of using the main body as a heat sink for the sensor layer, the approach is inverted: the sensor layer monitors current flows in the heat conductor layer directly, detecting temperature threshold exceedances through electrical resistance changes rather than thermal conduction from the main body.
3Measurement precision
If separate sensor components are integrated into the heat conductor layer to detect temperature, then detection capability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The sensor layer is merged with the heat conductor layer by arranging it on the same component structure. The sensor layer utilizes the existing electrical conductivity of the heat conductor layer to detect temperature threshold exceedances through resistance changes, eliminating the need for separate sensor components and complex integration processes.
4Measurement precision
If the sensor layer monitors current flows in the direction of its surface normal, then detection of isolated overheating spots is improved, but the structural complexity increases
Solution Approach 1:
The sensor layer serves multiple functions simultaneously: it acts as both a temperature monitoring element and a current distribution layer. By monitoring current flows in the direction of its surface normal, it can detect isolated overheating spots while maintaining its role in the electrical circuit, reducing the need for additional specialized components.
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 solution enables precise and cost-effective detection of local overheating conditions without affecting heat transfer, allowing for early detection of potentially dangerous situations and preventing electric arcs, thus ensuring safe operation.
Implementation Method 1
the sensor device comprises a sensor layer arranged on the side of the heat conductor layer facing away from the main body which is monitored for current flows which may occur substantially in the direction of its surface normal
Implementation Method 2
a main body (12) carrying a non-intrinsically safe heat conductor layer (14)
Data Source
AI summary
A vehicle heater comprises a main body carrying a non-intrinsically safe heat conductor layer, and a sensor device allocated to the heat conductor layer and provided to detect an exceedance of a temperature threshold value. The sensor device comprises a sensor layer arranged on the side of the heat conductor layer facing away from the main body which is monitored for current flows which may occur substantially in the direction of its surface normal. In a method for producing a vehicle heater a main body of the vehicle heater is equipped with a non-intrinsically safe heat conductor, and a sensor device for detecting exceedances of a temperature threshold value. A sensor layer provided to be monitored for current flows which may occur substantially in the direction of the surface normal of the sensor layer is allocated to the heat conductor layer on its side facing away from the main body to form the sensor device.