Gas Sensor Control Device Using Deterioration-Adaptive Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gas sensor technologies fail to accurately measure the concentration of specific components in target gases due to the lack of correction for sensor deterioration, leading to inaccurate concentration measurements.
Innovation Solution
A gas sensor control device that includes a measurement chamber for introducing external target gases, with a first pumping cell for oxygen pumping and a second pumping cell with electrodes to output a current based on gas component concentration, using a calculation unit to calculate the concentration by correcting for initial offsets and cumulative operating time, and selecting appropriate linear or quadratic expressions based on operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas sensor output is used directly for concentration measurement, then the measurement process is simple, but the measurement accuracy deteriorates due to sensor deterioration
Solution Approach 1:
The system performs preliminary actions by storing multiple linear expressions in advance, each corresponding to different sensor deterioration states. The calculation unit selects and applies the appropriate pre-stored expression based on current sensor conditions, avoiding the need to develop complex correction algorithms in real-time while maintaining high measurement accuracy.
Solution Approach 2:
The invention changes the parameter of the calculation method by switching between different linear expressions based on sensor deterioration degree. Instead of using a fixed calculation formula, the system adapts the calculation parameters (selecting different expressions from stored options) according to the sensor's actual state, thereby maintaining accuracy despite sensor degradation.
2Measurement precision
If sensor output is corrected for deterioration, then the concentration measurement accuracy improves, but the calculation complexity increases
Solution Approach 1:
Multiple linear expressions corresponding to different sensor deterioration states are prepared in advance and stored in the system. This preliminary preparation allows the calculation unit to simply select and apply the appropriate expression based on current sensor conditions, achieving accurate correction without complex real-time calculations.
Solution Approach 2:
The system implements feedback by monitoring the sensor's current output characteristics and selecting the appropriate linear expression based on this feedback. The calculation unit continuously adapts to sensor deterioration by choosing expressions that match the current sensor state, ensuring accurate measurements throughout the sensor's lifecycle.
3Measurement precision
If multiple linear expressions are stored for different deterioration states, then the measurement accuracy throughout sensor lifecycle improves, but the memory requirements and system complexity increase
Solution Approach 1:
The sensor's operational lifecycle is segmented into multiple stages based on deterioration levels, with each stage having its own dedicated linear expression. This segmentation allows the system to store a manageable number of expressions covering different deterioration phases, balancing memory usage with measurement accuracy across the entire sensor lifespan.
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
Enables accurate calculation of gas component concentrations reflecting the deterioration state of the gas sensor, improving measurement accuracy by accounting for sensor degradation and operating conditions.
Implementation Method 1
a first pumping cell configured to perform pumping-out and pumping-in of oxygen with respect to the measurement target gas in the measurement chamber
Implementation Method 2
a second pumping cell having a pair of electrodes disposed inside and outside the measurement chamber, respectively, and configured to output a current between the pair of electrodes in accordance with a concentration of a specific component in the measurement target gas
Data Source
AI summary
A gas sensor control device controls a gas sensor including a first pumping cell and a second pumping cell configured to output a current in accordance with a concentration of a specific component in a measurement target gas. The gas sensor control device has a microprocessor configured to, when calculating the concentration of the specific component, use a correction expression based on an index including at least either an initial offset indicating a current value when the concentration of the specific component at a first reference time is 0 or a difference between an ideal value and the current value when the concentration of the specific component at a second reference time is a set concentration, and a cumulative operating time which is a total operating time of the gas sensor from a third reference time.