Laminated Gas Sensor Leakage Portion Oscillation Control
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Solution Overview
Problem
Laminate-type gas sensors face oscillation issues in feedback control due to time lags in output voltage changes, leading to unstable measurements and reduced accuracy, often requiring additional components like high pass filters that increase manufacturing costs.
Innovation Solution
A gas sensor configuration with an oxygen-concentration detection cell and an oxygen pump cell electrically connected through a leakage portion, primarily made of zirconia, which reduces phase delay and suppresses oscillation without the need for a dedicated control circuit or additional components like high pass filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is implemented in laminate-type gas sensors, then measurement accuracy is improved, but control circuit oscillation occurs due to time lag
Solution Approach 1:
A capacitor is introduced as an intermediary component between the oxygen pump cell and the control circuit. This capacitor absorbs the time lag effects and prevents oscillation, allowing feedback control to operate stably without compromising measurement accuracy
2Reliability
If a high pass filter is added to suppress oscillation, then control circuit stability is improved, but manufacturing cost increases
Solution Approach 1:
The oscillation suppression function is extracted from the control circuit and implemented through a simple capacitor connected to the sensor structure itself. This eliminates the need for complex high pass filters and dedicated oscillation suppression circuits, reducing manufacturing costs while maintaining stability
3Reliability
If a dedicated control circuit with oscillation suppression is used, then control circuit stability is improved, but device complexity increases
Solution Approach 1:
The sensor structure itself provides oscillation suppression through the capacitor connection, making the control circuit simpler and more universal. The sensor becomes self-sufficient in suppressing oscillations without requiring complex dedicated control circuits
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 configuration stabilizes feedback control, maintains measurement accuracy, and reduces manufacturing costs by eliminating the need for oscillation suppression components in the control circuit.
Implementation Method 1
an oxygen pump cell which pumps oxygen into the measurement chamber and pumps oxygen out of the measurement chamber in accordance with a pump current supplied to the oxygen pump cell
Implementation Method 2
an oxygen-concentration detection cell which produces an output voltage corresponding to a concentration of oxygen within the measurement chamber
Implementation Method 3
a first solid electrolyte member and a pair of electrodes disposed on the first solid electrolyte member... a second solid electrolyte member and a pair of electrodes disposed on the second solid electrolyte member
Data Source
AI summary
A gas sensor (100) includes an oxygen pump cell (135) and an oxygen-concentration detection cell (150) laminated together with a spacer (145) interposed therebetween. The spacer (145) has a gas detection chamber (145c) which faces electrodes (137, 152) of the cells (135, 150). The oxygen-concentration detection cell (150) produces an output voltage corresponding to the concentration of oxygen in the gas detection chamber (145c). The oxygen pump cell (135) pumps oxygen into and out of the measurement chamber (145c) such that the output voltage of the oxygen-concentration detection cell (150) becomes equal to a predetermined target voltage. A leakage portion mainly formed of zirconia is disposed between which electrically connects the oxygen-concentration detection cell (150) and the oxygen pump cell (135).