Heating Glass Power Control Using Thermal Resistance and Phase Shift
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Solution Overview
Problem
Existing systems for controlling heating glasses in vehicles consume excessive power to maintain constant temperatures and struggle to provide optimal power control for heating glasses of varying sizes and loads.
Innovation Solution
A system and method for controlling a heating glass that calculates optimal applied power based on a temperature model transfer function, incorporating integrated thermal resistance, and adjusts power delivery through phase shift of AC power to ensure efficient heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant power is supplied to the heating glass load to maintain constant temperature, then the heating function is reliable, but power consumption becomes excessive
Solution Approach 1:
The patent applies dynamics by transitioning from constant power supply to dynamic power adjustment. The controller continuously calculates required power based on real-time temperature and humidity sensor data, adjusting the heating power dynamically to match actual heating needs while maintaining reliable anti-condensation function.
Solution Approach 2:
The patent implements parameter changes by using temperature and humidity as variable parameters to determine power levels. Instead of fixed power, the system changes power parameters based on measured environmental conditions, achieving energy efficiency while maintaining heating reliability.
2Ease of operation
If constant duty ratio is used to control heating temperatures of multiple heating glasses, then control is simplified, but optimal power distribution for various sizes and loads cannot be achieved
Solution Approach 1:
The patent applies local quality by providing customized power control for each heating glass based on its specific characteristics. Each heating glass receives power levels tailored to its size, location, and thermal load requirements, rather than uniform constant duty ratio control, enabling optimal performance across diverse heating glasses.
Solution Approach 2:
The system changes power parameters individually for each heating glass based on sensor data and thermal resistance calculations. This allows each heating glass to operate at its optimal power level, achieving adaptability to various sizes and loads while maintaining relatively simple controller-based operation.
3Difficulty of detecting and measuring
If low-resolution sensor data is used for power calculation, then measurement is simpler, but power control precision deteriorates causing extreme duty ratios of 100% or 0%
Solution Approach 1:
The patent applies preliminary action by pre-calculating thermal resistance values and establishing power adjustment strategies before extreme conditions occur. The system proactively adjusts power based on thermal models and sensor trends, preventing the need for extreme 0% or 100% duty ratios even when using low-resolution sensors.
Solution Approach 2:
The patent introduces thermal resistance as an intermediary parameter that bridges low-resolution sensor data and power control decisions. By calculating thermal resistance and using it as a mediator in power calculations, the system achieves smoother power transitions and avoids extreme duty ratios despite limited sensor precision.
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 effectively reduces power consumption while maintaining optimal heating performance, ensuring a clear driver's field of view by preventing condensation and frost on the heating glass.
Implementation Method 1
A vehicle includes a heating glass located at the front and rear of the vehicle and performs the function of raising the surface temperature of the heating glass by applying power to a load located in the heating glass
Implementation Method 2
calculating, by the controller, applied power to reach the designated temperature based on an integrated thermal resistance formed in the heating glass
Data Source
AI summary
An embodiment method of controlling a heating glass includes setting a designated temperature of the heating glass depending on temperature and humidity conditions measured through a sensor, calculating an applied power to reach the designated temperature based on an integrated thermal resistance formed in the heating glass, performing a phase shift of AC power of two or more phases to provide the calculated applied power to a load of the heating glass, and calculating a corrected power in consideration of a resolution of the sensor, wherein respective operations are controlled depending on a set control cycle.