Gas Sensor Heater Control for Disturbance Compensation
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Solution Overview
Problem
Existing gas sensors face measurement errors due to disturbances in the measuring atmosphere, such as gas flow and humidity, which affect the accuracy of gas concentration detection.
Innovation Solution
The gas sensor employs a control circuit to adjust the heater voltage or heating time based on disturbance information, using temperature-sensitive elements and heaters to maintain accurate detection signals by compensating for environmental disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the heater heats the temperature-sensitive element to a fixed temperature for gas detection, then the detection process is simple, but measurement errors occur due to disturbances in the measuring atmosphere (gas flow, humidity)
Solution Approach 1:
The control circuit performs preliminary measurement of disturbance information (gas flow, humidity) before the actual gas concentration detection. Based on these preliminary measurements, the control circuit pre-adjusts the heater voltage or heating time to compensate for expected measurement errors, ensuring accurate detection despite environmental disturbances.
Solution Approach 2:
The control circuit continuously monitors disturbance information from temperature-sensitive elements and uses this feedback to dynamically adjust the heater's heating conditions. This closed-loop control ensures that the temperature-sensitive element maintains optimal detection conditions despite changes in the measuring atmosphere, thereby improving measurement precision.
2Measurement precision
If the heater voltage or heating time is adjusted to compensate for disturbances, then measurement accuracy improves, but the heating control system becomes more complex
Solution Approach 1:
The control circuit automatically measures disturbance information and adjusts the heater voltage or heating time without requiring manual intervention. The system self-regulates the heating conditions based on real-time environmental measurements, improving detection accuracy while maintaining ease of operation through automation.
3Measurement precision
If multiple temperature-sensitive elements and heaters are used to measure disturbance information, then disturbance detection accuracy improves, but the sensor structure becomes more complex
Solution Approach 1:
The sensor is divided into multiple functional units: some temperature-sensitive elements are dedicated to measuring disturbance information (gas flow, humidity), while others are dedicated to gas concentration detection. Each element has its own heating control, allowing independent optimization of measurement functions and improving overall measurement precision through specialized segmentation.
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 sensor accurately measures gas concentration by correcting for disturbances, ensuring precise detection irrespective of atmospheric conditions.
Implementation Method 1
a first heater configured to heat the first temperature-sensitive element
Implementation Method 2
a first temperature-sensitive element... obtain disturbance information based on a resistance value of the first temperature-sensitive element
Data Source
AI summary
Disclosed herein is a gas sensor that includes a sensor part configured to generate a detection signal indicating a concentration of a gas to be detected, and a control circuit configured to calculate the concentration of the gas to be detected based on the detection signal. The sensor part includes a temperature-sensitive element and a heater configured to heat the temperature-sensitive element. The control circuit is configured to obtain, in a disturbance information measurement period, disturbance information based on a resistance value of the temperature-sensitive element or a resistance value of the heater in a state where the temperature-sensitive element is heated to a first temperature range by the heater and obtain, in a gas concentration measurement period, the detection signal by heating the temperature-sensitive element to a second temperature range by the heater under a heating condition corresponding to the disturbance information.