Gas Sensor Temperature Control via Individualized Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gas sensors face challenges in accurately controlling the temperature of their solid electrolyte bodies to maintain detection accuracy due to individual differences in the relationship between temperature and internal resistance, which current correction techniques fail to accurately specify on a sensor-by-sensor basis.
Innovation Solution
A temperature control apparatus and method that includes a record section for inherent characteristic information, a relational expression storage section, an internal resistance detection section, and an energization control section to accurately specify and control the temperature of the detection element section based on its specific relationship with internal resistance, using a mathematical equation like Ln(Rpvs)=a×(1/T)+b.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If temperature control is performed based on a general relational expression without considering individual differences, then the control process is simple, but the detection accuracy deteriorates due to inaccurate temperature control
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing the actual relational expression between temperature and internal resistance for each individual gas sensor during the manufacturing process. This pre-characterization allows the sensor to receive customized temperature control parameters that match its specific properties, resolving the contradiction between simple control processes and accurate temperature control for each individual sensor.
Solution Approach 2:
The patent changes the control parameter from a general relational expression to an individualized relational expression specific to each sensor. By storing and using sensor-specific parameters (actual relational expression between temperature and internal resistance) in the storage section, the system achieves both simple automated control and high detection accuracy for each individual sensor.
2Adaptability or versatility
If correction of individual differences is performed using existing techniques, then some customization is achieved, but the relation between temperature and internal resistance cannot be accurately specified on a sensor-by-sensor basis
Solution Approach 1:
The patent replaces the inadequate existing correction technique with a precise measurement and storage system. By using an internal resistance measurement device to accurately measure the actual relational expression for each sensor and storing it in a dedicated storage section, the system achieves accurate sensor-by-sensor customization that existing techniques cannot provide.
Solution Approach 2:
The patent enables self-service by having each gas sensor characterized during manufacturing and having its specific relational expression stored for use during operation. The sensor essentially services itself with customized control parameters, achieving high accuracy without requiring complex real-time adjustment mechanisms during actual use.
3Ease of manufacture
If a general relational expression is used for all sensors, then manufacturing and control are simplified, but detection accuracy deteriorates due to individual differences among sensors
Solution Approach 1:
The patent applies preliminary action by performing the measurement and characterization of each sensor's actual relational expression during the manufacturing process. This pre-work captures individual differences and stores them for later use, allowing simplified control during operation while maintaining high detection accuracy through customized parameters for each sensor.
Solution Approach 2:
The patent changes from using a single general relational expression for all sensors to using individualized relational expressions stored in the storage section. This parameter customization for each sensor resolves the contradiction by enabling both simple automated control and high detection accuracy without complicating the manufacturing process.
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 approach allows for precise temperature control of gas sensors, enhancing detection accuracy by accurately specifying and controlling the internal resistance and temperature relationship unique to each sensor, thereby improving overall detection performance.
Implementation Method 1
a heater for heating the detection element section
Implementation Method 2
an internal resistance detection section for detecting the internal resistance between the pair of electrodes
Data Source
AI summary
A gas sensor including a detection element section (71) including a solid electrolyte body and a pair of electrodes disposed on the solid electrolyte body, and a heater (73) for heating the detection element section (71). Inherent characteristic information is recorded in a record section (170) provided on the gas sensor or a record section provided separately from the gas sensor. The inherent characteristic information is information specific to the detection element section (71) and which allows setting of a relation between a change in the temperature of the detection element section (71) and a change in the internal resistance between the pair of electrodes.