Gas Sensor Heater Current Temperature Compensation
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Solution Overview
Problem
Existing gas sensor modules require expensive temperature sensors and separate measurement circuits to compensate for temperature fluctuations, increasing costs and complexity.
Innovation Solution
A temperature compensation method using the change in heater current within the gas sensor module, where the output voltage equation is derived to account for temperature fluctuations, allowing compensation without an external thermometer, by measuring the heater current and determining a compensation coefficient through multiple points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate temperature sensor and measurement circuit are used for temperature compensation, then temperature compensation accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the temperature measurement function with the existing heater component by measuring the heater's resistance changes. The heater serves dual purposes: heating the sensor and acting as a temperature sensor through its resistance-temperature relationship, thereby eliminating the need for a separate temperature measurement circuit.
Solution Approach 2:
The heater component is given multiple functions: it not only provides thermal heating for the gas sensor but also serves as a temperature sensing element. By measuring the heater's resistance, the system obtains temperature information without requiring additional dedicated temperature sensing components.
2Measurement precision
If a separate temperature sensor is used for temperature compensation, then temperature measurement accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the temperature sensing function into the existing heater component. By utilizing the heater's inherent resistance-temperature relationship, the system achieves temperature measurement capability without adding separate temperature sensor components, thereby reducing manufacturing costs.
Solution Approach 2:
The heater component performs self-measurement of temperature through its own resistance changes. The system uses the heater's electrical properties to derive temperature information, allowing the component to serve its own measurement needs without external assistance from separate sensing elements.
3Reliability
If analog circuits including Wheatstone bridge are used for temperature compensation, then compensation effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex analog measurement circuits (such as Wheatstone bridges) with a simplified digital measurement approach. By measuring the heater's resistance using basic electrical measurement techniques and processing the data through temperature-voltage equations, the system achieves effective compensation with simpler circuitry.
Solution Approach 2:
The patent changes the measurement parameter from direct temperature measurement to resistance measurement of the heater. By measuring the heater's resistance and using the known resistance-temperature relationship along with temperature-voltage equations, the system achieves temperature compensation through parameter transformation rather than direct temperature sensing.
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 method reduces costs by eliminating the need for separate thermometers and temperature measurement circuits, enabling rapid observation of sensor temperature changes and effective compensation of output voltage fluctuations.
Implementation Method 1
measuring a resistance or current of a heater disposed in a gas sensor module
Implementation Method 2
deriving the fluctuation temperature by the heater current indicating a current value of a heater formed in the gas sensor module
Implementation Method 3
a detecting principle of the semiconductor type gas sensor adopts a phenomenon (a change in electric conductivity, that is, resistance or thermal conductivity) induced as target gas is adsorbed on or desorbed on the surface of a ceramic (oxide) semiconductor
Data Source
AI summary
A temperature compensation method for a gas sensor module using a change of heater current, may include deriving an output voltage equation of the gas sensor module from a cell reaction equation of an electrolyte and deriving the output voltage equation to an equation for a fluctuation temperature which varies depending on a sensor temperature and an unknown type compensation coefficient; deriving the fluctuation temperature to heater current indicating a current value of a heater formed in the gas sensor module and deriving the output voltage equation by the heater current and the compensation coefficient; and measuring output voltage depending on current of heaters at two or more points to determine the compensation coefficient of the output voltage equation, and the output voltage is configured to be compensated with the change of the heater current measured by the gas sensor module regardless of an external temperature.