Hot Surface Igniter Resistance Sensing for Accurate Temperature Control
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Solution Overview
Problem
Existing temperature control systems for hot surface igniters are inaccurate due to discrepancies between measured output voltage and actual voltage supplied, leading to incorrect heating temperatures.
Innovation Solution
A temperature measurement system that utilizes a current and terminal voltage measurement circuit to calculate the resistance value of the hot surface igniter, coupled with a resistance-temperature table to accurately determine the igniter's temperature, and incorporates an H-bridge driving circuit for stability and wide voltage input range (9 V-36 V) to accommodate varying operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If output voltage is measured to control heating temperature, then voltage control is simplified, but measurement accuracy deteriorates because output voltage does not equal actual voltage supplied to the hot surface igniter
Solution Approach 1:
The patent introduces resistance value as an intermediary parameter to indirectly represent the actual voltage supplied to the hot surface igniter. By measuring the resistance value of the hot surface igniter (which changes with temperature) and using a preset resistance-voltage correspondence relationship, the system can determine the actual supplied voltage without directly measuring it, thus resolving the contradiction between control simplicity and measurement accuracy
Solution Approach 2:
The system implements feedback control by continuously measuring the resistance value of the hot surface igniter, comparing it with preset values to determine the actual supplied voltage, and adjusting the power supply accordingly. This feedback mechanism ensures accurate temperature control while maintaining system simplicity
2Productivity
If supply voltage is increased to heat the hot surface igniter quickly, then heating speed is improved, but risk of overvoltage damage increases
Solution Approach 1:
The patent employs dynamic voltage control by adjusting the supply voltage in real-time based on the measured resistance value of the hot surface igniter. The system increases voltage during the heating phase to achieve rapid temperature rise, then automatically reduces voltage when the target temperature is reached, as indicated by the resistance value reaching a predetermined threshold. This dynamic adjustment resolves the contradiction between heating speed and safety by adapting the voltage level to the current heating state
Solution Approach 2:
The system uses periodic measurement and adjustment cycles, where the resistance value is continuously monitored and the supply voltage is periodically adjusted based on the measured values. This periodic control ensures the igniter reaches high temperature quickly while preventing overvoltage damage through timely voltage reduction
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 system provides accurate temperature control of hot surface igniters by directly measuring resistance values, ensuring precise temperature regulation and extending the igniter's lifespan while supporting diverse voltage requirements.
Implementation Method 1
the hot surface igniter utilizes a hot surface ignition technology, which can allow combustible gas/fuel to enter a combustion area after the hot surface igniter has reached a high temperature in advance
Implementation Method 2
a thermal resistor has a positive temperature coefficient that changes with the temperature of the hot surface igniter, which means that the resistance value of the thermal resistor also changes during the heating process
Data Source
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AI summary
A temperature measurement system for temperature control of a hot surface igniter, comprising a power supply module, configured for supplying power to the hot surface igniter; and further comprising an acquisition module, configured for acquiring a resistance value of the hot surface igniter; and a processing module, preset with a resistance-temperature meter and configured for acquiring a temperature value corresponding to a current resistance value from the preset resistance-temperature meter according to the resistance value. The acquisition module is used for acquiring the resistance value of the hot surface igniter, and the current temperature of the hot surface igniter is obtained by means of the relationship between the resistance and temperature, so that the temperature measurement function is achieved, and the measured temperature is more accurate. Further disclosed is a temperature measurement method for temperature control of the hot surface igniter.