Switchable Pane Temperature Determination via Electrical Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for determining the temperature of variable-transparency, switchable panes require multiple temperature sensors, leading to high cabling and cost burdens, especially in assemblies like motor vehicles where different panes can have varying temperatures due to insolation and electrical loads.
Innovation Solution
A method that applies an electrical voltage to the conductive contact layers of a switchable pane to determine the ohmic resistance value, allowing for temperature calculation without changing boundary conditions, and optionally uses a combination of capacitance and resistance values to determine the temperature, enabling temperature compensation and heating control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple temperature sensors are used to determine the temperature of each switchable pane, then temperature measurement precision is improved, but device complexity and cost increase due to additional cabling and sensors
Solution Approach 1:
The electrical contact layers serve dual functions: they act as electrodes for switching the variable-transparency layer and as temperature sensors through their temperature-dependent electrical resistance. This eliminates the need for separate temperature sensors and reduces cabling complexity while maintaining temperature measurement capability
Solution Approach 2:
The contact layers inherently provide temperature information through their electrical resistance characteristics without requiring additional measurement infrastructure. The existing electrical connection infrastructure is utilized for both switching and temperature sensing purposes
2Measurement precision
If multiple temperature sensors are installed for each switchable pane, then temperature determination accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The contact layers perform multiple functions including electrical contact for switching and temperature sensing, eliminating the need for separate temperature sensor components and reducing overall manufacturing costs while maintaining temperature determination accuracy
Solution Approach 2:
The temperature sensing function is merged with the existing electrical contact layers, combining two functions into a single component structure and reducing the total number of parts needed for assembly
3Ease of operation
If direct current is applied to determine temperature through resistance measurement, then temperature determination is simplified, but the variable-transparency layer may be damaged
Solution Approach 1:
Alternating current is used instead of direct current for resistance measurement, which prevents electrochemical degradation of the variable-transparency layer while still enabling temperature determination through resistance changes. The periodic nature of AC prevents continuous unidirectional current flow that would cause damage
Solution Approach 2:
The patent converts the potential harmful effect of direct current into a beneficial approach by using alternating current, which inherently protects the variable-transparency layer from electrochemical damage while maintaining the ability to perform resistance-based temperature measurements
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
Enables temperature determination of switchable panes with a single measurement, reducing the need for multiple sensors and allowing for uniform transmittance control across panes with different temperatures, while preventing damage to the variable-transparency layer by avoiding direct currents.
Implementation Method 1
proceeding from these method steps, depending on the respectively applied voltage and the current resulting in each case from the voltage, a respective ohmic resistance value of the respective contact layer is now determined
Implementation Method 2
A 'switchable pane' of this kind is a windowpane or a glass panel, which has a variable-transparency layer, which can be switched by two electrically conductive contact layers in order to set its degree of transmittance
Data Source
AI summary
The disclosure relates to a method for determining a temperature of a variable-transparency, switchable pane, which has a variable-transparency layer, which is arranged to switch said pane between two transparent electrically conductive contact layers, wherein, in the method, a control apparatus of the switchable pane applies an electrical voltage to at least one of the two contact layers and determines an electric current resulting in each case from the voltage. In this case, depending on the applied voltage and the current resulting in each case, a respective ohmic resistance value and/or a combination of electrical capacitance value and ohmic resistance value of the variable-transparency layer is determined and at least one temperature value is determined therefrom by a predetermined allocation rule.