Vehicle Heater Sensor Layer Thermal Spraying
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Solution Overview
Problem
Existing vehicle heater production methods require high-temperature baking processes, limiting the temperature tolerance of materials and increasing costs due to labor-intensive integration of separate temperature sensors, which are expensive and difficult to implement.
Innovation Solution
A method for producing vehicle heaters with a non-intrinsically safe heat conductor layer and a sprayed-on sensor device using thermal spraying methods, allowing the main body to avoid high temperatures and enabling the use of materials with lower temperature tolerance, such as aluminum, while improving heat conduction and precision in temperature detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If high-temperature baking processes are used to form sensor layers on the main body, then sensor layers can be directly formed on the main body, but the main body is exposed to temperatures of 900°C or more which limits material selection and increases production costs
Solution Approach 1:
A heat-resistant intermediate layer is applied to the main body before the sensor layer. This intermediate layer acts as a mediator that protects the main body from high temperatures during the baking process, allowing the sensor layer to be formed at high temperatures without damaging the main body. The intermediate layer has a glass transition temperature of at least 200°C and remains stable during the 900°C+ baking process.
Solution Approach 2:
The heat-resistant intermediate layer is applied to the main body before the sensor layer formation process. This preliminary action prepares the main body to withstand the subsequent high-temperature baking by providing thermal protection, enabling the sensor layer to be directly formed on the main body assembly without exposing the main body materials to damaging temperatures.
2Measurement precision
If separate temperature sensors are integrated into the heating element, then temperature detection is achieved, but the integration process is labor-intensive and cost-intensive
Solution Approach 1:
The temperature sensor function is merged directly into the sensor layer that is already being applied to the main body. Instead of integrating separate sensor components, the sensor layer itself is designed to detect temperature changes through its electrical resistance changes. This merging eliminates the need for separate sensor integration steps, reducing labor and costs while maintaining temperature detection capability.
Solution Approach 2:
The sensor layer serves multiple functions: it provides the temperature sensing capability and simultaneously acts as part of the heating element structure. The layer's electrical resistance changes with temperature, enabling temperature detection without requiring additional separate sensor components, thus reducing manufacturing complexity and cost.
3Power
If high voltages are used for the heat conductor layer to achieve high power output, then vehicle heater capacity of 3-8 kW can be achieved, but safety risks increase due to non-intrinsically safe heat conductor layers
Solution Approach 1:
The heat-resistant intermediate layer serves as a safety mediator between the high-voltage heat conductor layer and the main body. This intermediate layer with high dielectric strength provides electrical insulation, preventing arcing and short circuits even at high voltages up to 400V. This enables the use of non-intrinsically safe heat conductor layers at high voltages while maintaining safety through the intermediate protective layer.
Solution Approach 2:
The intermediate layer's dielectric strength parameter is specifically optimized to withstand the high operating voltages of the heat conductor layer. By selecting materials with appropriate dielectric properties (dielectric strength of at least 10 kV/mm), the system can safely operate at high voltages for 3-8 kW power output without compromising safety.
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 reduces material limitations and production costs, enabling the use of cost-effective materials and improving heat conduction and temperature detection precision, while avoiding the high temperatures associated with traditional baking methods.
Implementation Method 1
a sensor layer (16) which is provided to detect an exceedance of a temperature threshold value
Implementation Method 2
For forming the sensor device, the sensor layer (16) is sprayed on without the main body (12) being exposed to the temperatures common in baking processes
Implementation Method 3
a non-intrinsically safe heat conductor layer (14)
Data Source
AI summary
In a method for producing a vehicle heater (10), a main body (12) of the vehicle heater (10) is equipped with a non-intrinsically safe heat conductor layer (14), and a sensor device (16, 18, 20) for detecting exceedances of a temperature threshold value. To form the sensor device (16, 18, 20) a sensor layer (16) is sprayed on without the main body (12) being exposed to temperatures normal for baking processes.A vehicle heater (10) is equipped with a main body (12) carrying a non-intrinsically safe heat conductor layer (14), and with a sensor device (16, 18, 20) allocated to the heat conductor layer (14) and provided to detect the exceedance of a temperature threshold value. The sensor device (16, 18, 20) comprises a sprayed-on sensor layer (16) produced without the main body (12) assuming temperatures that are normal for baking processes.