Auxiliary system and method for oxygen sensor in low-temperature and high-humidity environment

Abstract

The invention relates to an auxiliary system and method for an oxygen sensor in a low-temperature and high-humidity environment. Comprising a gas pumping module, the first end of the Roots vacuum pump is connected to a gas environment, and the first end of the first three-way valve is connected with the second end of the Roots vacuum pump; according to the multi-stage dehumidification module, the first end and the second end of a water-gas separator are connected with the second end of a first three-way valve and the first end of a second three-way valve correspondingly, and the first end and the second end of a dryer are connected with the second end and the third end of the second three-way valve correspondingly; the first end of the gas heating cavity is connected to the third end of the second three-way valve, and the second end of the gas heating cavity is connected to the gas environment through a first control valve; according to the testing module, the gas heating cavity is connected to the oxygen concentration testing cavity through the second control valve, the oxygen concentration testing cavity is connected to the first three-way valve, and the oxygen sensor is connected with the oxygen concentration testing cavity. The reliability of the oxygen sensor in a low-temperature and high-humidity extreme environment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering testing, and in particular to an auxiliary system and method for an oxygen sensor in a low-temperature and high-humidity environment. Background Art

[0002] A relatively common oxygen sensor sensing element is a sleeve made of stabilized zirconia ceramic. The inner cavity of the sleeve is filled with air, and the outside of the sleeve is the measured gas. An oxygen partial pressure difference will be generated between the inner and outer walls of the sleeve, thereby generating an electromotive force to calculate the measured oxygen concentration.

[0003] Due to the special working principle of this oxygen sensor, its characteristics can only be fully manifested at high temperatures (the end reaches above 300 °C). At about 800 °C, it responds fastest to changes in the air-fuel mixture, while its characteristics change greatly at low temperatures. Therefore, in practical applications, it is generally a heated oxygen sensor, which is mostly used for measuring the oxygen concentration in the exhaust gas of automobile engines (high-temperature environment).

[0004] When the working environment temperature is low, the self-heating of the oxygen sensor may not be able to stabilize at the optimal working temperature, and the ceramic sleeve of the sensor is hard and brittle. Frequent flushing by high-humidity air flow and multiple evaporation and gasification of water on its surface may cause it to break and fail. Therefore, traditional oxygen sensors have a high failure rate when exposed to a low-temperature and high-humidity environment for a long time. Summary of the Invention

[0005] Therefore, the present invention provides an auxiliary system and method for an oxygen sensor in a low-temperature and high-humidity environment to improve the reliability of the oxygen sensor in an extreme low-temperature and high-humidity environment.

[0006] To solve the above technical problems, the present invention provides an auxiliary system for an oxygen sensor in a low-temperature and high-humidity environment, including: A gas pumping module, including a first three-way valve and a Roots vacuum pump. The first end of the Roots vacuum pump is connected to the gas environment, and the first end of the first three-way valve is connected to the second end of the Roots vacuum pump; A multi-stage dehumidification module, including a dryer, a water-gas separator and a second three-way valve. The first end and the second end of the water-gas separator are respectively connected to the second end of the first three-way valve and the first end of the second three-way valve, and the first end and the second end of the dryer are respectively connected to the second end and the third end of the second three-way valve; A heating and temperature control module, including a first control valve and a gas heating chamber. The first end of the gas heating chamber is connected to the third end of the second three-way valve, and the second end of the gas heating chamber is connected to the gas environment through the first control valve; The test module includes a second control valve, an oxygen concentration test chamber, and an oxygen sensor. The third end of the gas heating chamber is connected to the first end of the oxygen concentration test chamber through the second control valve. The second end of the oxygen concentration test chamber is connected to the third end of the first three-way valve. The oxygen sensor is connected to the oxygen concentration test chamber.

[0007] In an embodiment of the present invention, the dryer includes a drying pipeline with a desiccant built therein.

[0008] In an embodiment of the present invention, a heating wire is arranged in the gas heating chamber.

[0009] In an embodiment of the present invention, the heating and temperature control module further includes a first pressure sensor, a temperature sensor, and a humidity sensor connected to the gas heating chamber. The first pressure sensor, the temperature sensor, and the humidity sensor are respectively used to monitor the pressure, temperature, and humidity in the gas heating chamber.

[0010] In an embodiment of the present invention, the test module further includes a second pressure sensor connected to the oxygen concentration test chamber. The second pressure sensor is used to monitor the pressure in the oxygen concentration test chamber.

[0011] In an embodiment of the present invention, both the first control valve and the second control valve are two-way valves.

[0012] In an embodiment of the present invention, the first three-way valve, the first control valve, the second three-way valve, and the second control valve are all solenoid valves.

[0013] In an embodiment of the present invention, a control module is further included. The control module includes a signal acquisition controller, and the signal acquisition controller is electrically connected to the air pumping module, the multi-stage dehumidification module, the heating and temperature control module, and the test module respectively.

[0014] The present invention also provides an auxiliary method for an oxygen sensor in a low-temperature and high-humidity environment. Using the auxiliary system for the oxygen sensor in the low-temperature and high-humidity environment, the method includes: Controlling the first three-way valve, the first control valve, and the second three-way valve to open, so that the Roots vacuum pump, the water-air separator, and the gas heating chamber are sequentially connected, and the gas heating chamber is connected to the gas environment; Controlling the Roots vacuum pump to rotate forward, sucking the measured gas in the gas environment, after primary dehumidification through the water-air separator, entering the gas heating chamber through the second three-way valve, and the original gas in the gas heating chamber is discharged through the first control valve; In response to the humidity in the gas heating chamber exceeding a preset humidity threshold, control the second three-way valve to connect the water-gas separator, the dryer, and the gas heating chamber in sequence, and perform secondary dehumidification through the dryer; In response to the humidity in the gas heating chamber dropping to the humidity threshold, control to close the first control valve and keep the Roots vacuum pump running continuously; In response to the pressure in the gas heating chamber reaching a preset pressure threshold, control to close the Roots vacuum pump, the first three-way valve, and the second three-way valve; Control to open the first three-way valve to connect the Roots vacuum pump and the oxygen concentration test chamber, control the Roots vacuum pump to reverse and evacuate the oxygen concentration test chamber; In response to the pressure in the oxygen concentration test chamber dropping to zero, control to close the Roots vacuum pump and the first three-way valve; Control to heat up the measured gas in the gas heating chamber, and in response to the temperature in the gas heating chamber exceeding a preset temperature threshold, control to open the second control valve; The measured gas flows from the gas heating chamber to the oxygen concentration test chamber under the action of a pressure difference. When the fluctuation ranges of the pressure in the gas heating chamber and the pressure in the oxygen concentration test chamber are within a preset range, obtain the oxygen concentration value through the oxygen sensor.

[0015] The above technical solution of the present invention has the following advantages compared with the prior art: An auxiliary system and method for an oxygen sensor in a low-temperature and high-humidity environment according to the present invention improve the reliability of the oxygen sensor in extreme environments by adding dehumidification, temperature control and other modules. The dehumidification module in this embodiment comprehensively considers the water-gas separation efficiency and economy, and proposes a flexible application method for the multi-stage dehumidification module. The desiccant has high water removal efficiency, but large consumption and needs to be replaced frequently. Therefore, when the water-gas separator can meet the water removal efficiency, it is not necessary for it to always intervene in the work, which can ensure the economy of the system on the premise of meeting the preset humidity.

[0016] The present invention uses the pump gas module, the multi-stage dehumidification module and the heating and temperature control module to cooperate with each other, which can ensure the temperature and dryness of the sampling gas path before entering the oxygen sensor, reduce the impact of water vapor on the ceramic structure of the oxygen sensor, avoid the ceramic sleeve of the oxygen sensor from being prone to cracks due to repeated condensation-evaporation of water vapor in a low-temperature and high-humidity environment, and extend the service life of the sensor.

[0017] The present invention cleverly uses the coupling control of a single gas pump (Roots vacuum pump) and multiple valves in the gas path to realize the purging and pressure regulation of the residual gas in different cavities and pipelines, and uses the gas pressure difference to realize the gas flow of different modules, and the system integration degree is relatively high.

[0018] The present invention adopts an integrated design of four functional modules, namely a gas pumping module, a multi-stage dehumidification module, a heating and temperature control module, and a testing module. Each module can be flexibly switched through a three-way valve and a two-way valve, which not only makes the internal layout of the system more compact but also facilitates installation and deployment in a limited space. It is particularly suitable for environments with limited space such as mines and tunnels. By optimizing the gas path layout, space is utilized to the maximum extent. The signal acquisition controller centrally manages the operation of each module, and realizes multi-functional coordination through a unified control interface, reducing the number of independent control units, simplifying the overall structure of the system, and achieving an organic combination of high integration and a compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to specific embodiments of the present invention in conjunction with the drawings.

[0020] Figure 1 It is a schematic diagram of the composition structure of the auxiliary system of the oxygen sensor in a low-temperature and high-humidity environment of the present invention.

[0021] Figure 2 It is a schematic diagram of the overall structure of the auxiliary system of the oxygen sensor in a low-temperature and high-humidity environment of the present invention.

[0022] Figure 3 It is a schematic diagram of the flow of the auxiliary method of the oxygen sensor in a low-temperature and high-humidity environment of the present invention.

[0023] Description of the reference numerals in the drawings: 100, gas pumping module; 200, multi-stage dehumidification module; 300, heating and temperature control module; 400, testing module; 500, control module; 1, first three-way valve; 2, Roots vacuum pump; 3, first control valve; 4, dryer; 5, water-gas separator; 6, second three-way valve; 7, gas heating chamber; 8, controller; 9, heating wire; 10, first pressure sensor; 11, temperature sensor; 12, humidity sensor; 13, second control valve; 14, second pressure sensor; 15, oxygen sensor; 16, oxygen concentration testing chamber. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following further illustrates the present invention in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited do not limit the present invention.

[0025] In the present invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of the present invention, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0026] In the present invention, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and "greater than", "less than", "exceeding", etc. are understood not to include the recited number; "above", "below", "within", etc. are understood to include the recited number. In the description of the present invention, if there is a description of "first" and "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0027] In the present invention, unless otherwise clearly defined, words such as "arranged", "installed", "connected", etc. should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, or integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

[0028] Example 1 Underground working environments such as mines and tunnels may have insufficient oxygen concentration due to limited ventilation conditions. In addition, areas such as food storage areas may also have relatively high humidity. Therefore, it is necessary to arrange an oxygen sensor 15 to regularly detect the oxygen concentration.

[0029] Refer to Figure 1 As shown, this embodiment provides an auxiliary system for an oxygen sensor in a low-temperature and high-humidity environment, including: A gas pumping module 100, including a first three-way valve 1 and a Roots vacuum pump 2. The first end of the Roots vacuum pump 2 is connected to the gas environment (underground gas), and the first end of the first three-way valve 1 is connected to the second end of the Roots vacuum pump 2; A multi-stage dehumidification module 200, including a dryer 4, a water-gas separator 5 and a second three-way valve 6. The first end and the second end of the water-gas separator 5 are respectively connected to the second end of the first three-way valve 1 and the first end of the second three-way valve 6, and the first end and the second end of the dryer 4 are respectively connected to the second end and the third end of the second three-way valve 6; A heating and temperature control module 300, including a first control valve 3 and a gas heating chamber 7. The first end of the gas heating chamber 7 is connected to the third end of the second three-way valve 6, and the second end of the gas heating chamber 7 is connected to the gas environment through the first control valve 3; The test module 400 includes a second control valve 13, an oxygen concentration test chamber 16, and an oxygen sensor 15. The third end of the gas heating chamber 7 is connected to the first end of the oxygen concentration test chamber 16 through the second control valve 13. The second end of the oxygen concentration test chamber 16 is connected to the third end of the first three-way valve 1. The oxygen sensor 15 is connected to the oxygen concentration test chamber 16.

[0030] With the above settings, as shown in Figure 2 , the gas pumping module 100 pumps the gas in the gas environment into the system. After being dehumidified by the multi-stage dehumidification module 200, it enters the heating and temperature control module 300. At this time, the heating and temperature control module 300 is connected to the gas environment to achieve the scavenging function. After the scavenging is completed, the connection between the heating and temperature control module 300 and the atmospheric environment is cut off. After the control module 500 coordinates the gas pumping module 100 and the heating and temperature control module 300 to adjust the pressure to the target value, the heating and temperature control module 300 is sealed and heated to above 300 °C. At the same time, the internal environment of the test module 400 is evacuated to vacuum through line a with the help of the gas pumping module 100 (or a vacuum pump is arranged inside the test module 400), and the atmospheric environment is directly connected through line b and evacuated to vacuum. After the original gas inside the test module 400 is removed, the test module 400 is sealed. When the control module 500 detects that the pressure and temperature requirements are met inside the heating and temperature control module 300 and the test module 400, the heating and temperature control module 300 and the test module 400 are connected. After the internal environment is stabilized, the oxygen concentration shown by the oxygen sensor 15 can be read.

[0031] By adopting the multi-stage dehumidification module 200 combining the water-gas separator 5 and the dryer 4, the dryer 4 can be flexibly turned on according to the detected humidity conditions, so as to achieve more efficient and economical dehumidification in a high-humidity environment and improve the adaptability to environments with different humidity levels.

[0032] Since the ceramic sleeve of the oxygen sensor 15 is prone to crack due to repeated condensation and evaporation of water vapor in a low-temperature and high-humidity environment, the cooperation of the gas pumping module 100, the multi-stage dehumidification module 200, and the heating and temperature control module 300 can ensure the temperature and dryness of the sampling gas path before the gas enters the oxygen sensor 15, reduce the impact of water vapor on the ceramic structure of the oxygen sensor 15, and extend the service life of the sensor.

[0033] Specifically, the dryer 4 includes a drying pipeline with a desiccant inside.

[0034] Specifically, a heating wire 9 is arranged in the gas heating chamber 7. By setting the heating wire 9 in the gas heating chamber 7 and monitoring the temperature in real time, the test gas can be heated to above 300 °C, so that the oxygen sensor 15 reaches its optimal working temperature range, greatly improving the stability and test accuracy of the sensor in a low-temperature and high-humidity environment.

[0035] Specifically, the heating and temperature control module 300 further includes a first pressure sensor 10, a temperature sensor 11, and a humidity sensor 12 connected to the gas heating chamber 7. The first pressure sensor 10, the temperature sensor 11, and the humidity sensor 12 are respectively used to monitor the pressure, temperature, and humidity in the gas heating chamber 7.

[0036] Specifically, the test module 400 further includes a second pressure sensor 14 connected to the oxygen concentration test chamber 16. The second pressure sensor 14 is used to monitor the pressure in the oxygen concentration test chamber 16.

[0037] Specifically, the first control valve 3 and the second control valve 13 are both two-way valves, and the first three-way valve 1, the first control valve 3, the second three-way valve 6, and the second control valve 13 are all solenoid valves. By adopting the combined design of four main functional modules including the air pumping module 100, the multi-stage dehumidification module 200, the heating and temperature control module 300, and the test module 400, each module can be flexibly switched through valve components such as solenoid valves and two-way valves, and the system integration degree is relatively high.

[0038] Specifically, a control module 500 is further included. The control module 500 includes a signal acquisition controller 8, and the signal acquisition controller 8 is electrically connected to the air pumping module 100, the multi-stage dehumidification module 200, the heating and temperature control module 300, and the test module 400 respectively. The signal acquisition controller 8 is responsible for controlling the air pumping module 100, the multi-stage dehumidification module 200, the heating and temperature control module 300, and the test module 400. The control module 500 includes but is not limited to: a programmable logic controller 8 (PLC), an embedded microcontroller 8 (MCU), an industrial personal computer (IPC), etc.

[0039] By integrating existing components such as solenoid valves, pressure sensors, temperature sensors 11, and humidity sensors 12 in the system, the overall manufacturing cost is reduced. The design of the multi-stage dehumidification module 200 takes into account the balance between dehumidification efficiency and desiccant consumption. By only activating the water separator 5 when the humidity is relatively low, the usage frequency and replacement cost of the desiccant are reduced. At the same time, the automatic control of the system reduces the need for manual maintenance, further saving costs.

[0040] During operation, the roots vacuum pump 2 sucks the gas to be measured from the ground or the external environment, and after preliminary dehumidification by the water separator 5, the excess water is discharged.

[0041] When the humidity in the gas heating chamber 7 is still too high, the system activates the drying pipeline through the second three-way valve 6 to further dry the gas.

[0042] After the gas is dehumidified, it enters the gas heating chamber 7, and the gas is heated to the required temperature by the built-in heating wire 9. The first pressure sensor 10, temperature sensor 11 and humidity sensor 12 monitor the condition of the gas chamber throughout the process.

[0043] Under the action of the reverse rotation of the Roots vacuum pump 2 in the gas pumping module 100, the oxygen concentration test chamber 16 is first evacuated to avoid measuring interference by evacuating the original gas.

[0044] When the temperature and pressure in the gas heating chamber 7 reach the set range, the second control valve 13 is opened to allow the heated gas to flow into the test chamber, and the oxygen concentration value is obtained through the oxygen sensor 15.

[0045] Embodiment 2 Refer to Figure 3 As shown, this embodiment provides an auxiliary method for an oxygen sensor in a low-temperature and high-humidity environment. Using the auxiliary system for an oxygen sensor in a low-temperature and high-humidity environment described in Embodiment 1, the method includes: S1. When the entire system is not in working hours, all valves are in the normally closed state. After the system is shut down, all components are automatically reset. After the system starts to work, control the first three-way valve 1, the first control valve 3 and the second three-way valve 6 to open, so that the Roots vacuum pump 2, the water-gas separator 5 and the gas heating chamber 7 are connected in sequence, and the gas heating chamber 7 is connected to the gas environment; S2. Control the Roots vacuum pump 2 to rotate forward to suck the measured gas in the gas environment. After primary dehumidification through the water-gas separator 5, it enters the gas heating chamber 7 through the second three-way valve 6, and the original gas in the gas heating chamber 7 is discharged to the gas environment through the first control valve 3; S3. Monitor the humidity in the gas heating chamber 7 through the humidity sensor 12. In response to the humidity in the gas heating chamber 7 exceeding the preset humidity threshold, control the second three-way valve 6 to connect the water-gas separator 5, the dryer 4 and the gas heating chamber 7 in sequence, and perform secondary dehumidification through the dryer 4; to ensure the water-gas separation efficiency of the system. After purging for 5 minutes, the gas heating chamber 7 is completely filled with fresh measured gas.

[0046] First perform primary dehumidification with the water-gas separator 5, and then decide whether to enable the dryer 4 for secondary dehumidification according to the real-time humidity situation, which greatly shortens the dehumidification time.

[0047] S4. In response to the humidity in the gas heating chamber 7 dropping to the humidity threshold, control to close the first control valve 3 and keep the Roots vacuum pump 2 running; at this time, the pressure in the gas heating chamber 7 will gradually increase; S5. Monitor the pressure in the heating chamber through the first pressure sensor 10. In response to the pressure in the gas heating chamber 7 reaching a preset pressure threshold (specifically, when it reaches twice the underground gas environment), control to close the Roots vacuum pump 2, the first three-way valve 1, and the second three-way valve 6. S6. Control to open the first three-way valve 1 to connect the Roots vacuum pump 2 with the oxygen concentration test chamber 16. Control the Roots vacuum pump 2 to reverse and evacuate the oxygen concentration test chamber 16. Monitor through the second pressure sensor 14. S7. In response to the pressure in the oxygen concentration test chamber 16 dropping to zero (absolute pressure, i.e., reaching a vacuum), control to close the Roots vacuum pump 2 and the first three-way valve 1. S8. Control to heat up the gas to be measured in the gas heating chamber 7 through the heating wire 9 in the gas heating chamber 7. In response to the temperature in the gas heating chamber 7 exceeding a preset temperature threshold (350 °C in this embodiment), control to open the second control valve 13. Heat the gas chamber to about 350 °C through the heating and temperature control module 300 and create a vacuum in the test chamber to ensure that subsequent measurements are not interfered by residual gases.

[0048] S9. The gas to be measured flows from the gas heating chamber 7 to the oxygen concentration test chamber 16 under the action of the pressure difference. In response to the pressure fluctuations in the gas heating chamber 7 and the oxygen concentration test chamber 16 being within a preset range (no obvious fluctuations), obtain the oxygen concentration value (i.e., the underground gas oxygen concentration) through the oxygen sensor 15.

[0049] In this embodiment, taking high-humidity and low-temperature environments such as mines, tunnels, and food storage as examples, through the combination of the water separator 5 and the dryer 4, when the humidity sensor 12 detects that the humidity in the gas heating chamber 7 exceeds the threshold, switch to the dryer 4, which can significantly reduce the loss of desiccant and balance the dehumidification efficiency and economy. When the gas heating chamber 7 is connected to the external gas environment, purge the heating chamber to discharge the residual moisture and continuously feed fresh gas at the same time, effectively avoiding local water accumulation or excessive humidity in the gas heating chamber 7.

[0050] Before closing the gas heating chamber 7 from the atmospheric environment, keep the pressure controllable by the gas pumping module 100, which can not only improve the airtightness of the gas path of the oxygen sensor 15 but also avoid the interference of environmental air pressure fluctuations on the measurement.

[0051] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0052] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or the combination of blocks.

[0053] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or the combination of blocks.

[0054] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or the combination of blocks.

[0055] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An auxiliary system for an oxygen sensor in a low temperature and high humidity environment, characterized in that: include: A pump gas module (100) comprises a first three-way valve (1) and a Roots vacuum pump (2), wherein a first end of the Roots vacuum pump (2) is connected to a gas environment, and a first end of the first three-way valve (1) is connected to a second end of the Roots vacuum pump (2); A multi-stage dehumidification module (200), comprising a dryer (4), a water-gas separator (5) and a second three-way valve (6), wherein the first end and the second end of the water-gas separator (5) are respectively connected to the second end of the first three-way valve (1) and the first end of the second three-way valve (6), and the first end and the second end of the dryer (4) are respectively connected to the second end and the third end of the second three-way valve (6); A heating temperature control module (300) comprising a first control valve (3) and a gas heating chamber (7), wherein a first end of the gas heating chamber (7) is connected to a third end of the second three-way valve (6), and a second end of the gas heating chamber (7) is connected to a gas environment via the first control valve (3); A test module (400) comprises a second control valve (13), an oxygen concentration test chamber (16) and an oxygen sensor (15); the third end of the gas heating chamber (7) is connected to the first end of the oxygen concentration test chamber (16) via the second control valve (13); the second end of the oxygen concentration test chamber (16) is connected to the third end of the first three-way valve (1); and the oxygen sensor (15) is connected to the oxygen concentration test chamber (16).

2. The auxiliary system of an oxygen sensor in a low temperature and high humidity environment according to claim 1, characterized in that: The dryer (4) comprises a drying pipeline with a built-in desiccant.

3. The auxiliary system of an oxygen sensor in a low temperature and high humidity environment according to claim 1, characterized in that: A heating wire (9) is arranged in the gas heating chamber (7).

4. The auxiliary system of an oxygen sensor in a low temperature and high humidity environment according to claim 1, characterized in that: The heating and temperature control module (300) further comprises a first pressure sensor (10), a temperature sensor (11) and a humidity sensor (12) connected to the gas heating chamber (7); the first pressure sensor (10), the temperature sensor (11) and the humidity sensor (12) are respectively used to monitor the pressure, temperature and humidity in the gas heating chamber (7).

5. The auxiliary system of an oxygen sensor in a low temperature and high humidity environment according to claim 1, characterized in that: The test module (400) further comprises a second pressure sensor (14) connected to the oxygen concentration test chamber (16), wherein the second pressure sensor (14) is used to monitor the pressure in the oxygen concentration test chamber (16).

6. The auxiliary system of an oxygen sensor in a low temperature and high humidity environment according to claim 1, characterized in that: The first control valve (3) and the second control valve (13) are both two-way valves.

7. The auxiliary system of an oxygen sensor in a low temperature and high humidity environment according to claim 1, characterized in that: The first three-way valve (1), the first control valve (3), the second three-way valve (6) and the second control valve (13) are all solenoid valves.

8. The auxiliary system of an oxygen sensor in a low temperature and high humidity environment according to claim 1, characterized in that: It also includes a control module (500), the control module (500) including a signal acquisition controller (8), the signal acquisition controller (8) being electrically connected to the air pump module (100), the multi-stage dehumidification module (200), the heating and temperature control module (300), and the test module (400), respectively.

9. An auxiliary method for an oxygen sensor in a low temperature and high humidity environment, characterized in that: Using the auxiliary system for an oxygen sensor in a low temperature and high humidity environment according to any one of claims 1 to 8, the method comprises: Controlling the first three-way valve (1), the first control valve (3) and the second three-way valve (6) to open, so that the Roots vacuum pump (2), the water-gas separator (5) and the gas heating chamber (7) are connected in sequence, and the gas heating chamber (7) is connected to the gas environment; Controlling the Roots vacuum pump (2) to rotate forward, sucking in the gas to be tested in the gas environment, and after primary dehumidification through the water-gas separator (5), the gas enters the gas heating chamber (7) through the second three-way valve (6), and the original gas in the gas heating chamber (7) is discharged through the first control valve (3); In response to the humidity in the gas heating chamber (7) exceeding a preset humidity threshold, controlling the second three-way valve (6) to connect the water-gas separator (5), the dryer (4) and the gas heating chamber (7) in sequence, and performing secondary dehumidification through the dryer (4); In response to the humidity in the gas heating chamber (7) dropping to the humidity threshold, controlling the first control valve (3) to close, and keeping the Roots vacuum pump (2) running; In response to the pressure in the gas heating chamber (7) reaching a preset pressure threshold, controlling the Roots vacuum pump (2), the first three-way valve (1) and the second three-way valve (6) to close; Controlling the opening of the first three-way valve (1) to connect the Roots vacuum pump (2) and the oxygen concentration test chamber (16), and controlling the Roots vacuum pump (2) to reverse and evacuate the oxygen concentration test chamber (16); In response to the pressure in the oxygen concentration test chamber (16) dropping to zero, controlling the Roots vacuum pump (2) and the first three-way valve (1) to close; Controlling the heating of the gas to be tested in the gas heating chamber (7) to increase its temperature, and in response to the temperature in the gas heating chamber (7) exceeding a preset temperature threshold, controlling the second control valve (13) to open; The gas to be measured flows from the gas heating chamber (7) to the oxygen concentration test chamber (16) under the action of a pressure difference, and in response to the fluctuation range of the pressure in the gas heating chamber (7) and the pressure in the oxygen concentration test chamber (16) being within a preset range, an oxygen concentration value is obtained through the oxygen sensor (15).

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