External Temperature Estimation From Internal Sensor Heat Lag
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Solution Overview
Problem
The existing temperature detection systems in air-conditioning devices face low control accuracy due to the difference between internal and external temperatures, with current correction methods being inadequate for immediate power-on scenarios and changing heating element states.
Innovation Solution
A temperature correcting device that includes a power supply, lapsed time obtain part, temperature detector, and external temperature estimation part, which calculates a temperature correction value using elapsed time and thermal capacity to accurately estimate external temperatures by correcting internal temperature readings, especially when power is turned on or off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature detected by the temperature detector is used directly for control, then the device complexity is low, but the control accuracy deteriorates due to the difference between internal and external temperatures
Solution Approach 1:
The patent uses a simple, inexpensive temperature detector that measures internal temperature, combined with a computational correction approach rather than using complex external temperature sensors. The correction value is calculated based on predetermined relationships between internal and external temperatures, avoiding the need for expensive or complex measurement devices while achieving accurate external temperature estimation.
Solution Approach 2:
The patent introduces a correction value as an intermediary element that bridges the gap between internal temperature measurements and external temperature requirements. This correction value acts as a mediator that translates the easily obtainable internal temperature data into accurate external temperature estimates without requiring direct external measurement.
2Measurement precision
If the temperature correction is performed after heating element temperature change is finished, then the temperature measurement stability is improved, but the response time deteriorates and control accuracy at power-on is low
Solution Approach 1:
The patent performs temperature correction calculations immediately when power is supplied to the terminal machine, before the heating elements have fully stabilized. By calculating the correction value based on the initial internal temperature and predetermined relationships, the system obtains external temperature information promptly without waiting for thermal stabilization, enabling timely control responses.
Solution Approach 2:
The patent establishes a feedback mechanism where the correction value is continuously updated based on the relationship between internal temperature measurements and expected external temperatures. This feedback loop allows the system to adapt to changing thermal conditions and maintain accurate temperature correction even as heating elements operate and temperatures fluctuate.
3Reliability
If a simple temperature detection system is used without considering heating element state changes, then the device complexity is low, but the reliability deteriorates when heating element state changes
Solution Approach 1:
The patent enables the temperature detection system to automatically adapt to heating element state changes by using feedback from internal temperature measurements. The system self-adjusts the correction value based on the observed relationship between internal and external temperatures, eliminating the need for separate monitoring systems while maintaining reliability under varying heating conditions.
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 ensures accurate temperature correction immediately after power is turned on, even when the heating element's state changes, thereby improving the control accuracy of air-conditioning systems by bridging the internal and external temperature discrepancies.
Implementation Method 1
The temperature detector is disposed in the terminal machine to detect a temperature inside the terminal machine as an internal temperature
Implementation Method 2
The casing receives various kinds of heating elements including a calculation part or a lighting part
Implementation Method 3
The external temperature estimation part calculates the temperature correction value by correcting a stop-time correction value which is the temperature correction value when the supply of electric power is turned off, using the lapsed time and a thermal capacity around the temperature detector inside of the terminal machine
Data Source
AI summary
A temperature correcting device includes: a power supply that supplies electric power to a terminal machine; a lapsed time obtain part that acquires a lapsed time after the power supply stops the supply of electric power; a temperature detector disposed in the terminal machine to detect a temperature inside the terminal machine as an internal temperature; and an external temperature estimation part that estimates a temperature out of the terminal machine as an external temperature by correcting the internal temperature using a temperature correction value which changes with the lapsed time.