A gas sensor control device and a control method

Abstract

The application relates to the technical field of gas sensor control devices, and discloses a gas sensor control device which comprises a sealed box, the outer wall of the sealed box is provided with a side plate, the inner cavity of the sealed box is provided with a reference cavity, and the inner cavity of the reference cavity is fixedly provided with a reference gas sensor. The gas sensor control device and the control method are characterized in that the reference cavity and the measuring cavity are arranged, the reference cavity is filled with high-purity nitrogen in a sealed mode, the reference gas sensor, the temperature and humidity sensor and the TEC temperature control module are arranged, and a stable zero point reference is formed; the zero point reference cavity is constructed, the reference cavity outputs a pure environmental interference signal, the measuring cavity outputs a mixed signal of concentration and interference, the controller performs difference operation, the environmental influence can be eliminated, the real gas concentration is output, the current of the TEC plate is controlled according to the environmental temperature, the direction of the current is changed, the hot end and the cold end of the TEC plate are changed, and the working temperature of the sensors in the measuring cavity and the reference cavity is adjusted.

Description

Technical Field

[0001] This invention relates to the field of gas sensor control device technology, specifically to a gas sensor control device and control method. Background Technology

[0002] Gas sensors have become a core component of modern gas detection technology due to their wide application in environmental monitoring, industrial safety, chemical production, energy detection, smart homes and other fields.

[0003] Traditional gas sensor control devices suffer from significant environmental interference, resulting in insufficient accuracy and stability, hindering precise detection. Currently, most gas sensor control devices employ a single-cavity structure, lacking a calibration reference cavity. In practical use, the detected data is susceptible to environmental fluctuations, and the absence of a reference cavity prevents the elimination of environmental influences. Temperature significantly impacts gas sensor performance, and existing temperature control solutions have clear limitations. The electrical characteristics, catalytic activity, and response sensitivity of gas sensors are highly sensitive to ambient temperature; excessively high or low temperatures lead to abnormal sensor output signals and increased detection errors, exacerbating sensor drift over time. Existing technologies often employ simple temperature compensation with a single heating element, providing only limited heating capabilities and failing to achieve cooling regulation. This results in ineffective overheating control at high temperatures and an inability to quickly raise the cavity temperature to the optimal detection temperature at low temperatures. Furthermore, existing gas sensors exhibit low intake and exhaust efficiency, leading to gas accumulation and residue, and are susceptible to damage from high-concentration gases. The existing device has independent air intake and exhaust lines. Air intake is driven by an air pump, and there is no active exhaust device in the exhaust line. After the test is completed, the gas to be tested remaining in the cavity cannot be quickly discharged. This will not only interfere with the next test result, but also expose the sensor to the residual gas for a long time, accelerating the aging of the sensor. Summary of the Invention

[0004] This invention provides a gas sensor control device and control method, which solves the problems mentioned in the background art.

[0005] This invention provides the following technical solution: a gas sensor control device, comprising a sealed box, a side plate installed on the outer wall of the sealed box, a reference cavity installed in the inner cavity of the sealed box, a reference gas sensor fixedly mounted in the inner cavity of the reference cavity, a reference temperature sensor installed on the outer wall of the reference gas sensor, a TEC module installed on the outer wall of the reference cavity, a reference humidity sensor fixedly mounted on the outer wall of the reference gas sensor, a measuring component provided in the inner cavity of the sealed box, and a controller installed on the outer wall of the reference cavity. The controller is electrically connected to the reference gas sensor, the reference temperature sensor, the reference humidity sensor, the measuring component, and the TEC module, respectively, and is used to receive signals from the reference temperature sensor and the reference humidity sensor and control the working state of the TEC module.

[0006] As a preferred embodiment of the present invention: the measuring component includes a measuring cavity, a measuring gas sensor is fixedly mounted on the inner wall of the measuring cavity, a measuring temperature sensor and a measuring humidity sensor are respectively mounted on both sides of the outer wall of the measuring gas sensor, a mounting frame is fixedly mounted on the outer wall of the measuring cavity, a TEC plate is mounted on the inner wall of the mounting frame, a heat-conducting plate is mounted on the outer wall of the TEC plate, and an air inlet pipe is fixedly mounted on the end of the measuring cavity away from the reference cavity.

[0007] As a preferred embodiment of the present invention: an air intake solenoid valve is installed at the end of the air intake pipe near the measuring chamber, a drive impeller is rotatably connected to the inner cavity of the air intake pipe, an air pump is fixedly mounted on the inner wall of the air intake pipe, a connecting shaft is fixedly mounted at the end of the drive impeller, and a drive bevel gear is fixedly mounted at the bottom of the connecting shaft.

[0008] As a preferred embodiment of the present invention: an exhaust pipe is fixedly mounted on the outer wall of the measuring cavity, an exhaust solenoid valve is installed on the inner wall of the exhaust pipe, a driven impeller is rotatably connected to the inner cavity of the exhaust pipe, a driven shaft is fixedly mounted on the end of the driven impeller, and a driven bevel gear is fixedly mounted on the end of the driven shaft away from the driven impeller.

[0009] As a preferred technical solution of the present invention: heat-conducting plates are installed on both sides of the outer wall of the TEC plate, and the heat-conducting plates are made of high-efficiency heat-conducting metal. There are two TEC plates, and the two TEC plates are respectively installed in the inner cavity of the mounting frame on both sides.

[0010] As a preferred embodiment of the present invention: the controller is electrically connected to the gas measuring sensor, the temperature measuring sensor, the humidity measuring sensor, the TEC board, the exhaust solenoid valve, and the intake solenoid valve, respectively, and the volume of the measuring chamber is adapted to the volume of the reference chamber.

[0011] As a preferred embodiment of the present invention: the air pump and the controller are electrically connected, and the outer wall of the driving bevel gear and the outer wall of the driven bevel gear mesh with each other.

[0012] As a preferred technical solution of the present invention: the measuring temperature sensor and the reference temperature sensor are the same type of sensor, and the measuring temperature sensor and the reference temperature sensor have the same detection accuracy, which is used to collect the temperature data of the measuring cavity and the reference cavity in real time and feed them back to the controller.

[0013] As a preferred embodiment of the present invention: both the intake solenoid valve and the exhaust solenoid valve are solenoid valves, and the intake solenoid valve and the exhaust solenoid valve are synchronously controlled by the controller to realize the on / off and flow regulation of the gas to be tested.

[0014] A control method for a gas sensor control device includes the following steps: S1: High-purity nitrogen gas is pre-filled into the inner cavity of the reference cavity to form a sealed, constant-temperature, and constant-pressure zero-point standard cavity. At this time, the readings of the reference gas sensor in the inner cavity are all readings caused by the influence of environmental factors in the sealed cavity. Subsequently, the reading of the measuring gas sensor during use is subtracted from the reading measured by the reference gas sensor to obtain the actual reading of the gas to be measured, thereby providing a stable and known zero-point reference signal for the measuring gas sensor. S2: The controller controls the intake solenoid valve and exhaust solenoid valve to open synchronously and start the air pump. Under the action of the air pump, the gas to be tested is drawn into the inner cavity of the measuring chamber. The gas to be tested enters the inner cavity of the measuring chamber through the intake pipe and is driven by the airflow to make the drive impeller rotate. When the drive impeller rotates, since the connecting shaft and the drive bevel gear are coaxially installed with the drive impeller, the connecting shaft and the drive bevel gear can rotate synchronously. When the drive bevel gear rotates, it drives the driven impeller and the driven shaft to rotate. The gas to be tested flows through the measuring gas sensor and is discharged through the exhaust pipe, avoiding the damage to the sensitive element of the measuring gas sensor caused by the long-term residence of high-concentration gas. S3: The measuring temperature sensor and the reference temperature sensor collect temperature data of the measuring cavity and the reference cavity in real time, and feed the temperature signal back to the controller in real time. The controller drives the TEC module and TEC board to work synchronously according to the temperature signal, and achieves heating or cooling by switching the current direction, so that the measuring cavity and the reference cavity maintain the same temperature environment and eliminate common-mode interference caused by ambient temperature changes. Under the same environmental conditions, the reference gas sensor only outputs the reference signal affected by the environment, while the measuring gas sensor outputs a mixed signal containing gas concentration and environmental interference. The controller subtracts the reference signal of the reference gas sensor from the detection signal of the measuring gas sensor to achieve real-time calibration and error cancellation, and finally obtains the true gas concentration signal after removing temperature drift and circuit baseline drift, thus completing high-precision gas detection.

[0015] The present invention has the following beneficial effects: 1. The gas sensor control device and method, through the establishment of a reference cavity and a measuring cavity, the reference cavity is filled with high-purity nitrogen in a sealed manner and equipped with a reference gas sensor, a temperature and humidity sensor and a TEC temperature control module to form a stable zero-point reference; the zero-point reference cavity is constructed, the reference cavity outputs a pure environmental interference signal, and the measuring cavity outputs a mixed signal of concentration and interference. After the controller performs the difference calculation, the environmental influence can be eliminated, and the true gas concentration can be output. The current of the TEC board is controlled according to the ambient temperature, and the direction of the current is changed to change the hot end and cold end of the TEC board, thereby adjusting the working temperature of the sensor in the measuring cavity and the reference cavity.

[0016] 2. The gas sensor control device and method utilize a TEC plate, which can be heated or cooled in both the reference chamber and the measurement chamber, to maintain the sensor at its optimal operating temperature, adapting to high and low temperature environments. When the gas pump intakes, it drives the impeller in the intake pipe, and the power is transmitted via a connecting shaft and a drive bevel gear, linking the rotation of the exhaust impeller. This eliminates the need for additional power, achieving rapid and residue-free gas exchange, preventing damage to sensitive elements from high-concentration gases, and extending the sensor's lifespan. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the sealing box structure of the present invention; Figure 3 This is a schematic diagram of the measuring cavity structure of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the measuring cavity of the present invention; Figure 5 This is a schematic diagram of the reference cavity structure of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the sealing box of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the intake pipe of the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of the exhaust pipe of the present invention; Figure 9 This is a schematic diagram of the TEC board structure of the present invention; Figure 10 This is a schematic diagram of the connecting shaft structure of the present invention.

[0018] In the diagram: 1. Sealed box; 2. Side plate; 3. Reference chamber; 4. Reference gas sensor; 5. TEC module; 6. Reference temperature sensor; 7. Reference humidity sensor; 8. Measurement component; 9. Controller; 801. Measuring chamber; 802. Measuring gas sensor; 803. Measuring temperature sensor; 804. Measuring humidity sensor; 805. Mounting frame; 806. TEC board; 807. Heat-conducting plate; 808. Inlet pipe; 809. Inlet solenoid valve; 8010. Drive impeller; 8011. Air pump; 8012. Connecting shaft; 8013. Exhaust pipe; 8014. Exhaust solenoid valve; 8015. Driven impeller; 8016. Driven shaft; 8017. Driven bevel gear; 8018. Driven bevel gear. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-10 A gas sensor control device includes a sealed box 1, a side plate 2 installed on the outer wall of the sealed box 1, a reference cavity 3 installed in the inner cavity of the sealed box 1, a reference gas sensor 4 fixedly mounted in the inner cavity of the reference cavity 3, a reference temperature sensor 6 installed on the outer wall of the reference gas sensor 4, a TEC module 5 installed on the outer wall of the reference cavity 3, a reference humidity sensor 7 fixedly mounted on the outer wall of the reference gas sensor 4, a measuring component 8 provided in the inner cavity of the sealed box 1, and a controller 9 installed on the outer wall of the reference cavity 3. The controller 9 is electrically connected to the reference gas sensor 4, the reference temperature sensor 6, the reference humidity sensor 7, the measuring component 8, and the TEC module 5, and is used to receive signals from the reference temperature sensor 6 and the reference humidity sensor 7 and control the working state of the TEC module 5.

[0021] In the above structure, a reference cavity 3 is set in the inner cavity of the sealed box 1, and a reference gas sensor 4 is set in the inner cavity of the reference cavity 3 respectively. The inner cavity of the reference cavity 3 is in a sealed state, and high-purity nitrogen is injected into the inner cavity of the reference cavity 3, so that the interior of the reference cavity 3 is filled with high-purity nitrogen, and the interior of the reference cavity 3 maintains a stable environment of constant temperature and pressure, providing a fixed, stable, and known zero-point reference and environmental reference, which is used to eliminate common-mode interference caused by sensor zero-point drift, circuit baseline drift, and changes in ambient temperature, humidity and air pressure, and realize real-time calibration, error cancellation and baseline stabilization.

[0022] In a preferred embodiment: the measuring assembly 8 includes a measuring cavity 801, a measuring gas sensor 802 is fixedly mounted on the inner wall of the measuring cavity 801, a measuring temperature sensor 803 and a measuring humidity sensor 804 are respectively mounted on both sides of the outer wall of the measuring gas sensor 802, a mounting frame 805 is fixedly mounted on the outer wall of the measuring cavity 801, a TEC plate 806 is mounted on the inner wall of the mounting frame 805, a heat-conducting plate 807 is mounted on the outer wall of the TEC plate 806, and an air inlet pipe 808 is fixedly mounted on the end of the measuring cavity 801 away from the reference cavity 3.

[0023] In the above structure, a gas sensor 802 is installed inside the measuring chamber 801, and an inlet pipe 808 is installed at the end of the measuring chamber 801. When the gas to be measured needs to be detected, the gas to be measured is introduced into the inner cavity of the measuring chamber 801 through the inlet pipe 808. The gas sensor 802 detects the content of harmful substances in the gas. By setting both the measuring chamber 801 and the reference chamber 3 inside the sealed box 1, the inner cavity of the reference chamber 3 is filled with high-purity nitrogen. The reference gas sensor 4 reads zero without considering the influence of environmental factors. However, since both the reference gas sensor 4 and the measuring gas sensor 802 are inside the sealed box 1, the environmental influence on the reference gas sensor is reduced. The effects of temperature, humidity, and air pressure changes in the environment inside the sealed box 1 are consistent with those of the reference gas sensor 4 and the measuring gas sensor 802. Under the same environment, the effects on the reference gas sensor 4 and the measuring gas sensor 802 are consistent. The reference gas sensor 4 is only affected by the environment and is not affected by the gas concentration. In order to obtain accurate measurement data from the measuring gas sensor 802, the actual concentration signal is equal to the detection signal of the measuring gas sensor 802 minus the reference signal of the reference gas sensor 4. The readings affected by the environment are removed, resulting in more accurate measurement data and eliminating temperature drift, humidity drift, and baseline drift.

[0024] In a preferred embodiment: an intake solenoid valve 809 is installed at the end of the intake pipe 808 near the measuring chamber 801; a drive impeller 8010 is rotatably connected to the inner cavity of the intake pipe 808; an air pump 8011 is fixedly mounted on the inner wall of the intake pipe 808; a connecting shaft 8012 is fixedly mounted at the end of the drive impeller 8010; and a drive bevel gear 8018 is fixedly mounted at the bottom of the connecting shaft 8012.

[0025] In the above structure, the intake pipe 808 is provided on the outer wall of the measuring chamber 801, and the exhaust solenoid valve 8014 is provided on the inner wall of the intake pipe 808. Under the action of the intake solenoid valve 809 and the exhaust solenoid valve 8014, the inner cavities of the intake pipe 808 and the exhaust pipe 8013 can be closed and opened respectively. When both the intake solenoid valve 809 and the exhaust solenoid valve 8014 are in the open state, the inner cavities of the intake pipe 808 and the exhaust pipe 8013 can be connected with the measuring chamber 801. At this time, the gas to be measured is drawn into the inner cavity of the measuring chamber 801 by the air pump 8011. Then, the gas can be detected by the gas sensor 802, so that the gas enters the measuring chamber 801 through the intake pipe 808 and exits the measuring chamber 801 through the exhaust pipe 8013, allowing the gas to be measured to circulate.

[0026] In a preferred embodiment: an exhaust pipe 8013 is fixedly mounted on the outer wall of the measuring chamber 801, an exhaust solenoid valve 8014 is installed on the inner wall of the exhaust pipe 8013, a driven impeller 8015 is rotatably connected to the inner cavity of the exhaust pipe 8013, a driven shaft 8016 is fixedly mounted on the end of the driven impeller 8015, and a driven bevel gear 8017 is fixedly mounted on the end of the driven shaft 8016 away from the driven impeller 8015.

[0027] In the above structure, the drive impeller 8010, which is rotatably connected in the inner cavity of the air inlet pipe 808, rotates under the impact of the gas to be measured when the air pump 8011 draws in the gas to be measured. This rotation of the drive impeller 8010 further allows the gas to be measured to enter the inner cavity of the measuring chamber 801. Since the connecting shaft 8012 and the drive bevel gear 8018 are coaxially mounted at the end of the drive impeller 8010, the drive bevel gear 8018 can rotate with the rotation of the drive impeller 8010, transmitting the power of the drive impeller 8010's rotation downwards.

[0028] In a preferred embodiment, heat-conducting plates 807 are installed on both sides of the outer wall of the TEC plate 806, and the heat-conducting plates 807 are made of high-efficiency heat-conducting metal. There are two TEC plates 806, and the two TEC plates 806 are respectively installed in the inner cavity of the mounting frames 805 on both sides.

[0029] In the above structure, the TEC board 806, installed in the inner cavity of the mounting frame 805, can detect the operating temperature of the gas sensor 802 in real time under the action of the temperature sensor 803 when the gas sensor 802 is working. At low temperatures, the gas sensor 802 has a slow response and low sensitivity; at high temperatures, it experiences large drift and zero-point instability. To avoid the influence of ambient temperature changes on the measurement data of the gas sensor 802, power is supplied to the TEC board 806. At low temperatures, the current flowing into the TEC board 806 is adjusted. The direction of the current flowing through the TEC board 806 is reversed so that the hot end of the TEC board 806 faces the inner cavity of the measuring cavity 801, thereby raising the temperature of the environment inside the measuring cavity 801. When the temperature inside the measuring cavity 801 is high, the direction of the current flowing through the TEC board 806 is reversed so that the cold end of the TEC board 806 faces the inner cavity of the measuring cavity 801, thereby absorbing the heat inside the measuring cavity 801 and achieving a cooling effect. Similarly, the inner cavity of the reference cavity 3 is synchronously temperature controlled so that both the measuring gas sensor 802 and the reference gas sensor 4 are at a suitable operating temperature, thereby improving the measurement accuracy.

[0030] In a preferred embodiment, the controller 9 is electrically connected to the gas measuring sensor 802, the temperature measuring sensor 803, the humidity measuring sensor 804, the TEC board 806, the exhaust solenoid valve 8014, and the intake solenoid valve 809, respectively, and the volume of the inner cavity of the measuring chamber 801 is adapted to the volume of the inner cavity of the reference chamber 3.

[0031] In the above structure, a temperature sensor 803 and a humidity sensor 804 are respectively installed on the outer wall of the gas measuring sensor 802. The temperature sensor 803 detects the operating temperature of the gas measuring sensor 802 in real time. Under the control of the controller 9, the controller 9 powers the TEC board 806, allowing the cold and hot ends of the TEC board 806 to work separately. By controlling the direction of the current to the TEC board 806, the direction of the cold and hot ends can be switched, thereby controlling the temperature of the environment inside the measuring cavity 801. This ensures that the ambient temperature inside the measuring cavity 801 does not affect the normal measurement data of the gas measuring sensor 802. When the TEC board 806 adjusts the temperature inside the measuring cavity 801, it simultaneously powers the TEC module 5, thereby simultaneously adjusting the ambient temperature of the reference cavity 3 and the measuring cavity 801 in real time. The matching of the volume of the measuring cavity 801 with the volume of the reference cavity 3 means that the error is within the allowable compensation range.

[0032] In a preferred embodiment, the air pump 8011 is electrically connected to the controller 9, and the outer wall of the driving bevel gear 8018 meshes with the outer wall of the driven bevel gear 8017.

[0033] In the above structure, the drive bevel gear 8018 installed at the end of the connecting shaft 8012 can synchronously drive the rotation of the connecting shaft 8012 and the drive bevel gear 8018 when the drive impeller 8010 rotates. Since the drive bevel gear 8018 and the driven bevel gear 8017 mesh with each other, the driven bevel gear 8017 is driven, which in turn allows the driven impeller 8015 to rotate in the inner cavity of the exhaust pipe 8013. As the driven impeller 8015 rotates, it can drive the gas to be measured in the inner cavity of the measuring chamber 801 to be discharged outward. This allows the gas to be measured to be discharged outward quickly through the exhaust pipe 8013 after entering the inner cavity of the measuring chamber 801, avoiding the gas to be measured from being in the inner cavity of the measuring chamber 801 for a long time, and avoiding high concentration gas from contacting the measuring gas sensor 802 for a long time, which could lead to poisoning, damage, and short life of the sensitive element.

[0034] In a preferred embodiment: the measuring temperature sensor 803 and the reference temperature sensor 6 are the same type of sensor, and the measuring temperature sensor 803 and the reference temperature sensor 6 have the same detection accuracy, which is used to collect the temperature data of the inner cavity of the measuring cavity 801 and the inner cavity of the reference cavity 3 in real time and feed it back to the controller 9.

[0035] In the above structure, a measuring temperature sensor 803 and a reference temperature sensor 6 are respectively installed in the inner cavities of the reference cavity 3 and the measuring cavity 801. Under the action of the measuring temperature sensor 803 and the reference temperature sensor 6, the ambient temperature is measured. The current to the TEC board 806 is adjusted according to the optimal operating temperature of the measuring gas sensor 802 to intervene in the ambient temperature, thereby ensuring that the measuring gas sensor 802 is at its optimal operating temperature. At the same time, the temperature of the inner cavity of the reference cavity 3 is adjusted to better provide a stable and known zero-point reference signal for the measuring gas sensor 802.

[0036] In a preferred embodiment: both the intake solenoid valve 809 and the exhaust solenoid valve 8014 are solenoid valves, and the intake solenoid valve 809 and the exhaust solenoid valve 8014 are synchronously controlled to open and close by the controller 9 to realize the on / off and flow regulation of the gas to be measured.

[0037] In the above structure, when the equipment is not in use, the inner cavities of the inlet pipe 808 and the exhaust pipe 8013 can be sealed off by the inlet solenoid valve 809 and the exhaust solenoid valve 8014 respectively, so that the inner cavity of the measuring chamber 801 is in a relatively closed state, thereby providing a certain degree of protection for the measuring gas sensor 802 and extending the service life of the measuring gas sensor 802.

[0038] A control method for a gas sensor control device includes the following steps: S1: High-purity nitrogen gas is pre-filled into the inner cavity of the reference cavity 3 to form a sealed, constant-temperature, and constant-pressure zero-point standard cavity. At this time, the readings of the reference gas sensor 4 in the inner cavity of the reference cavity 3 are all readings caused by the influence of environmental factors in the inner cavity of the sealed box 1. Subsequently, the readings of the measuring gas sensor 802 during use are subtracted from the readings measured by the reference gas sensor 4 to obtain the actual readings of the gas to be measured, thereby providing a stable and known zero-point reference signal for the measuring gas sensor 802. S2: The controller 9 controls the intake solenoid valve 809 and the exhaust solenoid valve 8014 to open synchronously and start the air pump 8011. Under the action of the air pump 8011, the gas to be tested is drawn into the inner cavity of the measuring chamber 801. The gas to be tested enters the inner cavity of the measuring chamber 801 through the intake pipe 808. Under the action of airflow, the drive impeller 8010 rotates. When the drive impeller 8010 rotates, since the connecting shaft 8012 and the drive bevel gear 8018 are coaxially installed with the drive impeller 8010, the connecting shaft 8012 and the drive bevel gear 8018 can rotate synchronously. When the drive bevel gear 8018 rotates, it drives the driven impeller 8015 and the driven shaft 8016 to rotate. The gas to be tested flows through the measuring gas sensor 802 and is discharged through the exhaust pipe 8013, avoiding the damage to the sensitive element of the measuring gas sensor 802 caused by the long-term residence of high-concentration gas. S3: The temperature data of the inner cavity of the measuring cavity 801 and the inner cavity of the reference cavity 3 are collected in real time using the measuring temperature sensor 803 and the reference temperature sensor 6, and the temperature signal is fed back to the controller 9 in real time. The controller 9 synchronously drives the TEC module 5 and the TEC board 806 to work according to the temperature signal, and realizes heating or cooling by switching the current direction, so that the inner cavity of the measuring cavity 801 and the inner cavity of the reference cavity 3 maintain the same temperature environment, eliminating common-mode interference caused by changes in ambient temperature. Under the same environmental conditions, the reference gas sensor 4 only outputs the reference signal affected by the environment, and the measuring gas sensor 802 outputs a mixed signal containing gas concentration and environmental interference. The controller 9 subtracts the reference signal of the reference gas sensor 4 from the detection signal of the measuring gas sensor 802 to realize real-time calibration and error cancellation, and finally obtains the true gas concentration signal after removing temperature drift and circuit baseline drift, thus completing high-precision gas detection.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended technical solutions and their equivalents.

Claims

1. A gas sensor control device, comprising a sealed box (1), characterized in that: The outer wall of the sealed box (1) is fitted with a side plate (2), the inner cavity of the sealed box (1) is fitted with a reference cavity (3), the inner cavity of the reference cavity (3) is fixedly fitted with a reference gas sensor (4), the outer wall of the reference gas sensor (4) is fitted with a reference temperature sensor (6), the outer wall of the reference cavity (3) is fitted with a TEC module (5), the outer wall of the reference gas sensor (4) is fixedly fitted with a reference humidity sensor (7), the inner cavity of the sealed box (1) is provided with a measuring component (8), the outer wall of the reference cavity (3) is fitted with a controller (9), the controller (9) is electrically connected to the reference gas sensor (4), the reference temperature sensor (6), the reference humidity sensor (7), the measuring component (8) and the TEC module (5) respectively, and is used to receive signals from the reference temperature sensor (6) and the reference humidity sensor (7) and control the working state of the TEC module (5).

2. The gas sensor control device according to claim 1, characterized in that: The measuring assembly (8) includes a measuring cavity (801), a measuring gas sensor (802) is fixedly mounted on the inner wall of the measuring cavity (801), a measuring temperature sensor (803) and a measuring humidity sensor (804) are respectively mounted on both sides of the outer wall of the measuring gas sensor (802), a mounting frame (805) is fixedly mounted on the outer wall of the measuring cavity (801), a TEC plate (806) is mounted on the inner wall of the mounting frame (805), a heat-conducting plate (807) is mounted on the outer wall of the TEC plate (806), and an air inlet pipe (808) is fixedly mounted on the end of the measuring cavity (801) away from the reference cavity (3).

3. The gas sensor control device according to claim 2, characterized in that: An intake solenoid valve (809) is installed at the end of the intake pipe (808) near the measuring chamber (801). A drive impeller (8010) is rotatably connected to the inner cavity of the intake pipe (808). An air pump (8011) is fixedly mounted on the inner wall of the intake pipe (808). A connecting shaft (8012) is fixedly mounted at the end of the drive impeller (8010). A drive bevel gear (8018) is fixedly mounted at the bottom of the connecting shaft (8012).

4. The gas sensor control device according to claim 3, characterized in that: An exhaust pipe (8013) is fixedly mounted on the outer wall of the measuring chamber (801). An exhaust solenoid valve (8014) is installed on the inner wall of the exhaust pipe (8013). A driven impeller (8015) is rotatably connected to the inner cavity of the exhaust pipe (8013). A driven shaft (8016) is fixedly mounted on the end of the driven impeller (8015). A driven bevel gear (8017) is fixedly mounted on the end of the driven shaft (8016) away from the driven impeller (8015).

5. A gas sensor control device according to claim 4, characterized in that: Both sides of the outer wall of the TEC plate (806) are equipped with heat-conducting plates (807), and the heat-conducting plates (807) are made of high-efficiency heat-conducting metal. There are two TEC plates (806), and the two TEC plates (806) are respectively installed in the inner cavity of the mounting frames (805) on both sides.

6. A gas sensor control device according to claim 4, characterized in that: The controller (9) is electrically connected to the gas sensor (802), temperature sensor (803), humidity sensor (804), TEC board (806), exhaust solenoid valve (8014), and intake solenoid valve (809), respectively. The volume of the inner cavity of the measuring chamber (801) is adapted to the volume of the inner cavity of the reference chamber (3).

7. A gas sensor control device according to claim 6, characterized in that: The air pump (8011) is electrically connected to the controller (9), and the outer wall of the driving bevel gear (8018) meshes with the outer wall of the driven bevel gear (8017).

8. A gas sensor control device according to claim 7, characterized in that: The measuring temperature sensor (803) and the reference temperature sensor (6) are the same type of sensor, and the measuring temperature sensor (803) and the reference temperature sensor (6) have the same detection accuracy. They are used to collect the temperature data of the inner cavity of the measuring cavity (801) and the inner cavity of the reference cavity (3) in real time and feed it back to the controller (9).

9. A gas sensor control device according to claim 8, characterized in that: Both the intake solenoid valve (809) and the exhaust solenoid valve (8014) are solenoid valves, and the intake solenoid valve (809) and the exhaust solenoid valve (8014) are synchronously controlled by the controller (9) to realize the on / off and flow regulation of the gas to be tested.

10. The control method of a gas sensor control device according to claim 9, characterized in that: Includes the following steps: S1: High-purity nitrogen gas is pre-filled into the inner cavity of the reference cavity (3) to form a sealed, constant temperature and constant pressure zero-point standard cavity. At this time, the readings of the reference gas sensor (4) in the inner cavity of the reference cavity (3) are all readings caused by the influence of environmental factors in the inner cavity of the sealed box (1). Then, the reading of the measuring gas sensor (802) during the measurement is subtracted from the reading measured by the reference gas sensor (4) to obtain the actual reading of the gas to be measured, so as to provide a stable and known zero-point reference signal for the measuring gas sensor (802). S2: The controller (9) controls the intake solenoid valve (809) and exhaust solenoid valve (8014) to open synchronously and start the air pump (8011). Under the action of the air pump (8011), the gas to be tested is drawn into the inner cavity of the measuring chamber (801), so that the gas to be tested enters the inner cavity of the measuring chamber (801) through the intake pipe (808), and the driving impeller (8010) is rotated under the action of airflow. When the driving impeller (8010) rotates, due to the connection shaft (8012) and the driving cone The bevel gear (8018) and the drive impeller (8010) are coaxially mounted, so that the connecting shaft (8012) and the drive bevel gear (8018) can rotate synchronously. When the drive bevel gear (8018) rotates, it drives the driven impeller (8015) and the driven shaft (8016) to rotate, so that the gas to be measured flows through the gas sensor (802) and is discharged through the exhaust pipe (8013), avoiding the damage to the sensitive element of the gas sensor (802) caused by the long-term residence of high-concentration gas. S3: The temperature data of the inner cavity of the measuring cavity (801) and the inner cavity of the reference cavity (3) are collected in real time by the measuring temperature sensor (803) and the reference temperature sensor (6), and the temperature signal is fed back to the controller (9) in real time. The controller (9) drives the TEC module (5) and the TEC board (806) to work synchronously according to the temperature signal. Heating or cooling is achieved by switching the current direction, so that the inner cavity of the measuring cavity (801) and the inner cavity of the reference cavity (3) maintain the same temperature environment and eliminate common-mode interference caused by changes in ambient temperature. Under the same environmental conditions, the reference gas sensor (4) only outputs the reference signal affected by the environment, and the measuring gas sensor (802) outputs a mixed signal containing gas concentration and environmental interference. The controller (9) subtracts the reference signal of the reference gas sensor (4) from the detection signal of the measuring gas sensor (802) to achieve real-time calibration and error cancellation, and finally obtains the real gas concentration signal after removing temperature drift and circuit baseline drift, thus completing high-precision gas detection.

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