Combustible gas detection method, detection device, detection equipment and storage medium

Abstract

The present invention discloses a combustible gas detection method, detection device, detection equipment and storage medium. The combustible gas detection method comprises: when the change characteristics of the current response signal of the combustible gas sensor compared with the initial response signal conform to the change characteristics of the response signal when the combustible gas concentration is less than the preset concentration, obtaining the current reaction temperature inside the combustible gas sensor; according to whether the change trend of the current reaction temperature compared with the initial reaction temperature conforms to the reaction temperature change trend when combustible gas exists, determining whether there is combustible gas in the environment where the combustible gas sensor is located. The technical solution of the embodiment of the present invention can improve the accuracy of combustible gas detection.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to a combustible gas detection method, a detection device, a detection equipment and a storage medium. Background Art

[0002] When a combustible gas sensor detects combustible gas, it usually determines whether there is combustible gas based on the response signal output by the combustible gas sensor. However, there are many factors that affect the signal output of the combustible gas sensor, such as the initial state of the combustible gas sensor, intake air humidity, and combustible gas concentration.

[0003] During the detection process of the combustible gas sensor, due to environmental changes, such as changes in ambient temperature, humidity, and airflow, the oxygen partial pressure inside the sensor will change, which in turn causes a certain change in the response signal output by the combustible gas sensor. The response signal changes caused by the above environmental changes are similar to the response signal change characteristics of the combustible gas sensor output caused by low-concentration combustible gas, and cannot be accurately distinguished, resulting in low accuracy in the detection of combustible gas by the combustible gas sensor. Summary of the invention

[0004] The present invention provides a combustible gas detection method, a detection device, a detection equipment and a storage medium to improve the accuracy of combustible gas detection.

[0005] According to one aspect of the present invention, there is provided a combustible gas detection method, comprising:

[0006] When the change characteristics of the current response signal of the combustible gas sensor compared to the initial response signal meet the change characteristics of the response signal when the combustible gas concentration is less than the preset concentration, obtaining the current reaction temperature inside the combustible gas sensor;

[0007] Whether there is combustible gas in the environment where the combustible gas sensor is located is determined according to whether the change trend of the current reaction temperature compared to the initial reaction temperature conforms to the change trend of the reaction temperature when combustible gas exists.

[0008] Optionally, the reaction temperature variation trend when the combustible gas exists is: when the combustible gas exists, the reaction temperature inside the combustible gas sensor increases compared to the initial reaction temperature.

[0009] Optionally, determining whether there is combustible gas in the environment where the combustible gas sensor is located, according to whether the change trend of the current reaction temperature compared to the initial reaction temperature conforms to the change trend of the reaction temperature when combustible gas is present, includes:

[0010] When the current reaction temperature is higher than the initial reaction temperature, it is determined that combustible gas exists in the environment where the combustible gas sensor is located;

[0011] When the current reaction temperature decreases compared to the initial reaction temperature, it is determined that no combustible gas exists in the environment where the combustible gas sensor is located.

[0012] Optionally, after determining that combustible gas exists in the environment where the combustible gas sensor is located, the method further includes:

[0013] The current combustible gas concentration is determined according to the current response signal.

[0014] Optionally, the combustible gas detection method further includes: when the change characteristics of the current response signal compared to the initial response signal meet the response signal change characteristics when the combustible gas concentration is greater than a preset concentration, determining the current combustible gas concentration according to the current response signal.

[0015] Optionally, the combustible gas sensor comprises: a heating circuit and a detection circuit; the heating circuit comprises a heating resistor, and the detection circuit comprises a load resistor and a detection element composed of a gas-sensitive material; the heating resistor and the detection element are arranged on the same substrate; a detection voltage is applied across the detection circuit; wherein the detection voltage remains constant during the detection process; and the voltage across the load resistor serves as a response signal of the combustible gas sensor;

[0016] Get the current reaction temperature of the combustible gas sensor, including:

[0017] The current temperature of the heating resistor is obtained as the current reaction temperature.

[0018] Optionally, a heating voltage is connected to both ends of the heating circuit; the heating circuit further comprises: a current detection component for detecting the current flowing through the heating resistor; wherein the heating voltage remains constant during the detection process;

[0019] Obtaining the current temperature of the heating resistor, including:

[0020] detecting a current flowing through the heating resistor;

[0021] Determining a current resistance value of the heating resistor according to the current current and the heating voltage;

[0022] The current temperature is determined according to the corresponding relationship between the resistance value of the heating resistor and the temperature and the current resistance value of the heating resistor.

[0023] According to another aspect of the present invention, there is provided a combustible gas detection device, comprising:

[0024] An acquisition module, used to acquire the current reaction temperature inside the combustible gas sensor when the change characteristics of the current response signal of the combustible gas sensor compared to the initial response signal meet the change characteristics of the response signal when the combustible gas concentration is less than a preset concentration;

[0025] The judgment module is used to determine whether there is combustible gas in the environment where the combustible gas sensor is located according to whether the change trend of the current reaction temperature compared to the initial reaction temperature conforms to the reaction temperature change trend when combustible gas exists.

[0026] According to another aspect of the present invention, there is provided a combustible gas detection device, comprising:

[0027] Combustible gas sensor;

[0028] A processor connected to the combustible gas sensor;

[0029] and, a memory communicatively connected to the processor;

[0030] The memory stores a computer program executable by the processor, and the computer program is executed by the processor so that the processor can execute the combustible gas detection method provided in any of the above embodiments.

[0031] According to another aspect of the present invention, a storage medium is provided, wherein the storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the combustible gas detection method provided in any of the above embodiments.

[0032] The technical solution of the embodiment of the present invention first determines the concentration of the combustible gas represented by the current response signal, and when the current response signal represents the presence of a combustible gas less than a preset concentration, further obtains the current reaction temperature inside the combustible gas sensor, and determines whether there is currently a combustible gas based on the change trend of the current reaction temperature compared to the initial reaction temperature. This is equivalent to verifying whether there is indeed a combustible gas in the environment in combination with the reaction temperature change trend, which can avoid misjudgment caused by changes in the response signal of the combustible gas sensor due to environmental changes, thereby improving the accuracy of combustible gas detection.

[0033] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of the structure of a combustible gas sensor provided according to an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of a circuit structure of a combustible gas sensor provided according to an embodiment of the present invention;

[0037] Figure 3 A flow chart of a combustible gas detection method provided according to an embodiment of the present invention;

[0038] Figure 4 A flow chart of another combustible gas detection method provided according to an embodiment of the present invention;

[0039] Figure 5 A schematic diagram of the structure of a combustible gas detection device provided according to an embodiment of the present invention;

[0040] Figure 6 The present invention is a schematic structural diagram of a combustible gas detection device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] An embodiment of the present invention provides a combustible gas detection method. This embodiment is applicable to combustible gas detection situations. The method can be performed by a combustible gas detection device, and the combustible gas detection device can be implemented in the form of hardware and / or software.

[0044] For ease of explanation, let's first combine Figure 1 and Figure 2 The structure and working process of the combustible gas sensor are briefly described. Figure 1 The combustible gas sensor includes a housing 100 and a detection component 101. The housing 100 is, for example, a metal cap with an air inlet hole on the top, and the detection component 101 is disposed inside the housing 100. The interior of the combustible gas sensor specifically refers to the internal space of the housing 100. The detection component 101 is, for example, a circuit board based on a ceramic substrate. Figure 2 Detailed circuit structure of the detection component 101 is shown. Figure 2 The detection component 101 of the combustible gas sensor includes: a heating circuit 10 and a detection circuit 11; the heating circuit 10 includes a heating resistor R H The detection circuit 11 includes a load resistor R2 connected in series and a detection element R composed of a gas-sensitive material. S . Detection element R S Closely fit the heating resistor R H surface.

[0045] A heating voltage VH is applied to both ends of the heating circuit 10, for example, a heating resistor R H A heating voltage VH is applied across the two ends, so that the heating resistor R H The temperature rises, causing the detection element R S The temperature required to react with the combustible gas is reached. A detection voltage VCC is applied across the detection circuit 11, and the voltage V across the load resistor R2 is used as the response signal output by the combustible gas sensor. When combustible gas is introduced into the combustible gas sensor, the detection element R S The gas-sensitive material in the detector reacts with the combustible gas, causing the detection element R S The resistance value of the load resistor R2 changes, which causes the voltage V at both ends of the load resistor R2 to change. The reaction degree of different concentrations of combustible gas and gas-sensitive materials is different, resulting in the detection element R SThe change in resistance value is different, so the change in voltage V across the load resistor R2 is also different. Accordingly, the response signal output by the combustible gas sensor can characterize the concentration of the combustible gas, or in other words, the change characteristics of the response signal output by the combustible gas sensor compared with the initial response signal can characterize the concentration of the combustible gas. The initial response signal can be specifically understood as the response signal of the combustible gas sensor when the concentration of the combustible gas is 0. Exemplarily, the combustible gas sensor can be a semiconductor sensor.

[0046] Figure 3 A flow chart of a combustible gas detection method according to an embodiment of the present invention is provided. Figure 3 , combustible gas detection methods include:

[0047] S101. When a change characteristic of a current response signal of the combustible gas sensor compared to an initial response signal meets a change characteristic of a response signal when the combustible gas concentration is less than a preset concentration, obtain a current reaction temperature inside the combustible gas sensor.

[0048] From the above analysis, we can know that the reaction degree of different concentrations of combustible gas and gas-sensitive materials is different, resulting in the detection element R S The change in resistance value is different, so the change in voltage V across the load resistor R2 is also different. Therefore, when different concentrations of combustible gas are introduced, the change characteristics of the current response signal output by the combustible gas sensor compared to the initial response signal are also different. For example, the higher the concentration of the introduced combustible gas, the greater the change in the current response signal compared to the initial response signal.

[0049] When the concentration of the combustible gas is high, the combustible gas reacts violently with the gas-sensitive material, causing the response signal output by the combustible gas semiconductor to change violently compared to the initial response signal. The presence of combustible gas can be more accurately determined based on the response signal. However, the change characteristics of the response signal output by the combustible gas sensor caused by environmental changes (such as changes in ambient temperature and humidity and / or changes in airflow) compared to the initial response signal are consistent with the change characteristics of the response signal output by the combustible gas sensor caused by low concentrations (for example, less than a preset concentration) of combustible gas compared to the initial response signal. At this time, only the response signal output by the combustible gas sensor cannot normally distinguish whether the current response signal is caused by environmental changes or due to the influence of the combustible gas. Under the influence of environmental changes, the change trend of the reaction temperature inside the combustible gas sensor compared to the initial reaction temperature is different from that under the influence of combustible gas. Therefore, when the change characteristics of the response signal compared to the initial response signal are consistent with the change characteristics of the response signal when the combustible gas concentration is less than the preset concentration, that is, when the response signal indicates that there is currently a low concentration of combustible gas, it is possible to further confirm whether the combustible gas actually exists based on the change trend of the reaction temperature, thereby avoiding misjudgment.

[0050] The preset concentration can be understood as the upper limit of the concentration of the combustible gas corresponding to the case where it is impossible to correctly distinguish whether the response signal output by the combustible gas sensor is caused by the combustible gas or by environmental changes.

[0051] Specifically, the current reaction temperature inside the combustible gas sensor is measured by a temperature detection related device / circuit, and then the current reaction temperature is obtained according to the output result of the device / circuit.

[0052] S102. Determine whether there is combustible gas in the environment where the combustible gas sensor is located, based on whether the change trend of the current reaction temperature compared to the initial reaction temperature conforms to the change trend of the reaction temperature when combustible gas is present.

[0053] The initial reaction temperature is the temperature of the heating resistor R when there is no combustible gas inside the combustible gas sensor. H The temperature reached by heating is determined by the heating voltage VH applied to both ends.

[0054] Specifically, the combustible gas sensor generally reacts with the combustible gas to be detected by the gas-sensitive material, causing the change of the resistance value of the gas-sensitive material to obtain the concentration of the gas to be detected. In order to improve the stability and reaction efficiency of semiconductor gas-sensitive materials, it is usually necessary to react with the combustible gas in an environment with a higher temperature (for example, more than 200°C). In the combustible gas sensor, the gas-sensitive material is heated by a heating resistor to reach the required reaction temperature; the combustible gas sensor will reach a certain thermal balance with the environment due to its own heat in the environment, so that the reaction temperature is maintained near the initial reaction temperature. When there is a combustible gas reacting with the gas-sensitive material, the reaction process releases heat rapidly, causing the temperature inside the combustible gas sensor to rise, that is, the current reaction temperature is higher than the initial reaction temperature. Exemplarily, the rate of heat release of the reaction is closely related to the concentration of the gas. However, since the normal temperature of the gas-sensitive material and the heating resistor of the combustible gas sensor is relatively high, usually exceeding 200°C, when there is no combustible gas, the heat conduction effect of the change in the external environment on the airflow exchange of the reaction environment inside the combustible gas sensor is cooling.

[0055] In summary, the initial reaction temperature of the combustible gas sensor is much higher than the room temperature. Since the reaction temperature change trend caused by the exothermic reaction between the combustible gas and the gas-sensitive material is different from the reaction temperature change trend caused by the change of the external environment, the presence of combustible gas can be verified by detecting the reaction temperature change trend inside the combustible gas sensor, thereby making a certain distinction between false alarms caused by the response signal being affected by part of the environment. For example, it can be determined whether the current reaction temperature is rising or falling compared to the initial reaction temperature to determine whether combustible gas exists.

[0056] The technical solution of the embodiment of the present invention first determines the concentration of the combustible gas represented by the current response signal, and when the current response signal represents the presence of a combustible gas less than a preset concentration, further obtains the current reaction temperature inside the combustible gas sensor, and determines whether there is currently a combustible gas based on the change trend of the current reaction temperature compared to the initial reaction temperature. This is equivalent to verifying whether there is indeed a combustible gas in the environment in combination with the reaction temperature change trend, which can avoid misjudgment caused by changes in the response signal of the combustible gas sensor due to environmental changes, thereby improving the accuracy of combustible gas detection.

[0057] On the basis of the above embodiment, optionally, the reaction temperature variation trend when combustible gas exists is: when combustible gas exists, the reaction temperature inside the combustible gas sensor increases compared to the initial reaction temperature.

[0058] Specifically, based on the heating resistor R H Due to the heating effect, in the absence of combustible gas, the internal temperature of the combustible gas sensor remains relatively stable, for example, stable near the initial reaction temperature. When combustible gas is introduced into the combustible gas sensor, the detection element R S The gas-sensitive material in the combustible gas reacts with the combustible gas and heats up, causing the reaction temperature inside the combustible gas sensor to increase compared to the initial reaction temperature.

[0059] Based on the above embodiment, optionally, determining whether there is combustible gas in the environment where the combustible gas sensor is located according to whether the change trend of the current reaction temperature compared to the initial reaction temperature conforms to the change trend of the reaction temperature when combustible gas exists includes:

[0060] 1) When the current reaction temperature is higher than the initial reaction temperature, it is determined that combustible gas exists in the environment where the combustible gas sensor is located.

[0061] Specifically, as analyzed above, the gas-sensitive material releases heat due to its reaction with the combustible gas, which will cause the reaction temperature to rise.

[0062] 2) When the current reaction temperature decreases compared to the initial reaction temperature, it is determined that no combustible gas exists in the environment where the combustible gas sensor is located.

[0063] Specifically, as analyzed above, due to the heating resistor R H The temperature of the detection element R increases under the action of the heating voltage VH. S The temperature required to react with the combustible gas is reached, and this temperature is much higher than the room temperature. When the environmental changes cause the inlet temperature, humidity / flow rate to change, the heat exchange between the ambient gas and the combustible gas sensor reduces the reaction temperature.

[0064] Based on the above embodiments, optionally, after determining that combustible gas exists in the environment where the combustible gas sensor is located, the method further includes:

[0065] The current combustible gas concentration is determined based on the current response signal.

[0066] Specifically, the current combustible gas concentration corresponding to the current response signal can be determined based on the corresponding relationship between the response signal and the combustible gas concentration. Exemplarily, the corresponding relationship between the response signal and the combustible gas concentration can be the relationship between the response signal output by the combustible gas sensor and the combustible gas concentration, or the relationship between the change in the response signal output by the combustible gas sensor compared to the initial response signal and the combustible gas concentration, or the detection sensitivity of the combustible gas sensor. When the current response signal output by the combustible gas sensor is determined, the combustible gas concentration obtained by substituting the current response signal into the above corresponding relationship is the current combustible gas concentration.

[0067] Figure 4 FIG. 1 is a flow chart of another combustible gas detection method according to an embodiment of the present invention. Figure 4 , combustible gas detection methods include:

[0068] S201. Obtain a current response signal of a combustible gas sensor.

[0069] S202, determining whether the change characteristics of the current response signal compared to the initial response signal conform to the change characteristics of the response signal when the combustible gas concentration is less than the preset concentration; if so, executing S203; if not, executing S205.

[0070] For example, when the outside of the combustible gas sensor is a rapidly changing warm and humid airflow, the rapid increase in intake temperature and humidity will cause the oxygen adsorption of the combustible gas sensor to decrease rapidly, causing the response signal to change rapidly, which is consistent with the response signal change characteristics when there is a low concentration of combustible gas. Therefore, when the change characteristics of the response signal compared to the initial response signal meet the response signal change characteristics when the combustible gas concentration is less than the preset concentration, it is necessary to further obtain the current reaction temperature.

[0071] S203: Acquire the current reaction temperature inside the combustible gas sensor.

[0072] S204, determining whether the change trend of the current reaction temperature compared to the initial reaction temperature conforms to the change trend of the reaction temperature when combustible gas exists; if so, executing S205; if not, executing S206.

[0073] Among them, since the warm and humid airflow is significantly lower than the high reaction temperature of more than 100 degrees inside the combustible gas sensor, it will cause the gas-sensitive material and the heating resistor integrated with it to significantly cool down, that is, the reaction temperature decreases. When the combustible gas actually exists, it usually releases heat due to the reaction with the gas-sensitive material, which will cause the temperature of the gas-sensitive material and the heating resistor to rise, that is, the reaction temperature rises. Therefore, according to the trend of the reaction temperature change, warm and humid airflow and combustible gas can be distinguished, thereby avoiding false alarms and improving the accuracy of combustible gas detection.

[0074] S205. Determine the current combustible gas concentration according to the current response signal.

[0075] S206: Determine that there is no flammable gas at present.

[0076] This embodiment provides a combustible gas detection method through steps S201-S206, which can improve the accuracy of combustible gas concentration detection.

[0077] Based on the above embodiment, optionally, there are multiple methods for obtaining the current reaction temperature inside the combustible gas sensor, which are described below respectively.

[0078] In one embodiment, optionally, an additional temperature sensor and its peripheral circuits can be integrated inside the combustible gas sensor, the current reaction temperature can be measured by the temperature sensor, and a voltage signal or digital signal proportional to the temperature can be directly output, and the current reaction temperature can be obtained based on the voltage signal or digital signal.

[0079] In another embodiment, optionally, the current reaction temperature can be determined based on the temperature of a heating resistor (such as a thermistor), which is described in detail below.

[0080] Specifically, the heating resistor R H With the detection element R S Closely attached to the same substrate, for example, on the front and back sides of the substrate, the heating resistor R H The temperature of the detection element R S The temperature of is the same as that of the reaction temperature. Then, obtaining the current reaction temperature inside the combustible gas sensor includes: obtaining the current temperature of the heating resistor as the current reaction temperature.

[0081] Exemplarily, the heating circuit 10 further includes: a current detection component for detecting the current flowing through the heating resistor R H There are many structures of current detection components and detection processes, several of which are described below, but they are not intended to limit the present invention.

[0082] See also Figure 2In one embodiment, the current detection component may optionally include a voltage divider resistor R1, and the resistance of the voltage divider resistor R1 is known. H The heating circuit 10 is formed in series, and the heating voltage VH can be applied to the voltage divider resistor R1 and the heating resistor R H Correspondingly, obtaining the current temperature of the heating resistor includes: detecting the current voltage across the voltage divider resistor R1, and determining the current flowing through the heating resistor R according to the current voltage and the resistance value of the voltage divider resistor R1. H The current current of the heating resistor R is determined according to the current voltage across the voltage divider resistor R1 and the heating voltage VH. H The current voltage is based on the heating resistor R H The current voltage and current determine the heating resistance R H The current resistance value of the heating resistor R H With a fixed temperature-resistance curve, when the heating resistor R H When the resistance value is known, the heating resistance R can be determined by the temperature-resistance curve H The current temperature. For example, the heating resistor R H It can be a metal resistor, whose resistance value increases with the increase of temperature. In this embodiment, the effect of intake air on the internal heat conduction of the sensor can be directly obtained through the feedback of the resistance value of the heating resistor. At the same time, combined with the change of the sensor response signal itself, it can distinguish the false alarm situation that the response signal change leads to the erroneous judgment of the presence of combustible gas in some cases.

[0083] In another optional embodiment of the present invention, the current detection component may include a current transformer, and the detection component of the current transformer may be sleeved on the heating resistor R H The power supply line is used to detect the current flowing through the heating resistor R H In this case, the heating voltage VH is directly applied to the heating resistor R H Correspondingly, the current temperature of the heating resistor is obtained, including: directly measuring the current flowing through the heating resistor R through the current transformer H The current of the heating resistor R H The current and heating voltage VH determine the heating resistance R H The current resistance value of the heating resistor R H The corresponding relationship between the resistance value and temperature and the heating resistance R H The current resistance value of the heating resistor R H The current temperature.

[0084] Based on the above embodiments, optionally, during the detection of the combustible gas concentration, the combustible gas sensor controls the heating voltage VH to be constant and controls the detection voltage VCC to be constant.H The current and heating resistance R H The resistance values ​​of the load resistor R2 are uniquely correlated, which is beneficial to improving the detection accuracy of the reaction temperature. At the same time, the voltage V across the load resistor R2 is only affected by the detection element R S The influence of the resistance change can avoid the influence of the detection voltage VCC change on the detection result. Exemplarily, the detection voltage VCC and the heating voltage VH can be the same.

[0085] An embodiment of the present invention further provides a combustible gas detection device. The combustible gas detection device provided by the embodiment of the present invention can execute the combustible gas detection method provided by any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0086] Figure 5 FIG. 1 is a schematic diagram of a combustible gas detection device according to an embodiment of the present invention. Figure 5 The device includes: an acquisition module 20 and a judgment module 30.

[0087] The acquisition module 20 is used to acquire the current reaction temperature inside the combustible gas sensor when the change characteristics of the current response signal of the combustible gas sensor compared to the initial response signal meet the response signal change characteristics when the combustible gas concentration is less than the preset concentration.

[0088] The judgment module 30 is used to determine whether there is combustible gas in the environment where the combustible gas sensor is located according to whether the change trend of the current reaction temperature compared to the initial reaction temperature conforms to the reaction temperature change trend when combustible gas exists.

[0089] Based on the above embodiment, optionally, the judgment module 30 is specifically used to determine whether combustible gas exists in the environment where the combustible gas sensor is located when the current reaction temperature is higher than the initial reaction temperature; and to determine whether combustible gas does not exist in the environment where the combustible gas sensor is located when the current reaction temperature is lower than the initial reaction temperature.

[0090] Based on the above embodiment, optionally, the combustible gas detection device further includes:

[0091] The first calculation module is used to determine the current concentration of the combustible gas according to the current response signal after determining that the combustible gas exists in the environment where the combustible gas sensor is located.

[0092] Based on the above embodiment, optionally, the combustible gas detection device further includes:

[0093] The second calculation module is used to determine the current combustible gas concentration according to the current response signal when the change characteristics of the current response signal compared to the initial response signal meet the response signal change characteristics when the combustible gas concentration is greater than the preset concentration.

[0094] Based on the above embodiment, optionally, the acquisition module 20 is specifically used to obtain the current temperature of the heating resistor as the current reaction temperature when the change characteristics of the current response signal of the combustible gas sensor compared to the initial response signal meet the response signal change characteristics when the combustible gas concentration is less than the preset concentration.

[0095] On the basis of the above embodiment, optionally, the acquisition module 20 includes: a detection unit, a first calculation unit and a second calculation unit.

[0096] The detection unit is used to detect the current current flowing through the heating resistor. The first calculation unit is used to determine the current resistance of the heating resistor according to the current current and the heating voltage. The second calculation unit is used to determine the current temperature according to the corresponding relationship between the resistance of the heating resistor and the temperature and the current resistance of the heating resistor.

[0097] An embodiment of the present invention also provides a combustible gas detection device, which includes: a combustible gas sensor; a processor connected to the combustible gas sensor; and a memory communicatively connected to the processor; wherein the memory stores a computer program executable by the processor, and the computer program is executed by the processor so that the processor can execute the combustible gas detection method provided in any of the above embodiments.

[0098] Figure 6 A schematic diagram of the structure of a combustible gas detection device according to an embodiment of the present invention is shown in FIG. Figure 6 The combustible gas detection device 40 includes at least one processor 41, and a memory connected to the at least one processor 41, such as a read-only memory (ROM) 42, a random access memory (RAM) 43, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 41 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 42 or the computer program loaded from the storage unit 48 to the random access memory (RAM) 43. In the RAM 43, various programs and data required for the operation of the combustible gas detection device 40 can also be stored. The processor 41, the ROM 42, and the RAM 43 are connected to each other through a bus 44. An input / output (I / O) interface 45 is also connected to the bus 44.

[0099] A number of components in the combustible gas detection device 40 are connected to the I / O interface 45, including: an input unit 46, such as a keyboard, a mouse, etc.; an output unit 47, such as various types of displays, speakers, etc.; a storage unit 48, such as a disk, an optical disk, etc.; and a communication unit 49, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 49 allows the combustible gas detection device 40 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0100] The processor 41 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 41 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 41 executes the various methods and processes described above, such as a combustible gas detection method.

[0101] In some embodiments, the combustible gas detection method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 48. In some embodiments, part or all of the computer program may be loaded and / or installed on the combustible gas detection device 40 via the ROM 42 and / or the communication unit 49. When the computer program is loaded into the RAM 43 and executed by the processor 41, one or more steps of the combustible gas detection method described above may be performed. Alternatively, in other embodiments, the processor 41 may be configured to perform the combustible gas detection method in any other suitable manner (e.g., by means of firmware).

[0102] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0103] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0104] In the context of the present invention, storage media can be tangible media that can contain or store computer programs used for or in combination with instruction execution systems, devices or equipment. Computer-readable storage media can include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0105] To provide interaction with a user, the systems and techniques described herein may be implemented on a combustible gas detection device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or trackball), through which a user may provide input to the combustible gas detection device. Other types of devices may also be used to provide interaction with a user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0106] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0107] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0108] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0109] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A combustible gas detection method, characterized in that: include: When the change characteristics of the current response signal of the combustible gas sensor compared to the initial response signal meet the change characteristics of the response signal when the combustible gas concentration is less than the preset concentration, obtaining the current reaction temperature inside the combustible gas sensor; Whether there is combustible gas in the environment where the combustible gas sensor is located is determined according to whether the change trend of the current reaction temperature compared to the initial reaction temperature conforms to the change trend of the reaction temperature when combustible gas exists.

2. The combustible gas detection method according to claim 1, characterized in that: The reaction temperature variation trend when the combustible gas exists is: when the combustible gas exists, the reaction temperature inside the combustible gas sensor increases compared to the initial reaction temperature.

3. The combustible gas detection method according to claim 1, characterized in that: Determining whether there is combustible gas in the environment where the combustible gas sensor is located, according to whether the change trend of the current reaction temperature compared to the initial reaction temperature conforms to the change trend of the reaction temperature when combustible gas is present, includes: When the current reaction temperature is higher than the initial reaction temperature, it is determined that combustible gas exists in the environment where the combustible gas sensor is located; When the current reaction temperature decreases compared to the initial reaction temperature, it is determined that no combustible gas exists in the environment where the combustible gas sensor is located.

4. The combustible gas detection method according to claim 3, characterized in that: After determining that combustible gas exists in the environment where the combustible gas sensor is located, the method further includes: The current combustible gas concentration is determined according to the current response signal.

5. The combustible gas detection method according to claim 1, characterized in that: Also includes: When the change characteristics of the current response signal compared to the initial response signal meet the change characteristics of the response signal when the combustible gas concentration is greater than the preset concentration, the current combustible gas concentration is determined according to the current response signal.

6. The combustible gas detection method according to claim 1, characterized in that: The combustible gas sensor comprises: a heating circuit and a detection circuit; the heating circuit comprises a heating resistor, and the detection circuit comprises a load resistor and a detection element composed of a gas-sensitive material; the heating resistor and the detection element are arranged on the same substrate; a detection voltage is applied to both ends of the detection circuit; wherein the detection voltage remains constant during the detection process; the voltage across the load resistor serves as a response signal of the combustible gas sensor; Get the current reaction temperature of the combustible gas sensor, including: The current temperature of the heating resistor is obtained as the current reaction temperature.

7. The combustible gas detection method according to claim 6, characterized in that: The two ends of the heating circuit are connected to a heating voltage; the heating circuit further comprises: a current detection component for detecting the current flowing through the heating resistor; wherein the heating voltage remains constant during the detection process; Obtaining the current temperature of the heating resistor, including: detecting a current flowing through the heating resistor; Determining a current resistance value of the heating resistor according to the current current and the heating voltage; The current temperature is determined according to the corresponding relationship between the resistance value of the heating resistor and the temperature and the current resistance value of the heating resistor.

8. A combustible gas detection device, characterized in that: include: An acquisition module, used to acquire the current reaction temperature inside the combustible gas sensor when the current response signal of the combustible gas sensor is compared with the change characteristics of the initial response signal and the change characteristics of the response signal when the combustible gas concentration is less than a preset concentration; The judgment module is used to determine whether there is combustible gas in the environment where the combustible gas sensor is located according to whether the change trend of the current reaction temperature compared to the initial reaction temperature conforms to the reaction temperature change trend when combustible gas exists.

9. A combustible gas detection device, characterized in that: include: Combustible gas sensor; A processor connected to the combustible gas sensor; and, a memory communicatively connected to the processor; The memory stores a computer program executable by the processor, and the computer program is executed by the processor so that the processor can execute the combustible gas detection method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the combustible gas detection method according to any one of claims 1 to 7.

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