A method for controlling the flow rate of a gas in a sampling channel and products associated therewith

Abstract

The application relates to a method for controlling the gas flow rate in a sampling channel and a related product, one end of the sampling channel is provided with a gas inlet, wherein the device for controlling the gas flow rate in the sampling channel comprises a gas flow rate detector arranged at the gas inlet and used for detecting the gas flow rate at the gas inlet; a fan arranged in the sampling channel and used for adjusting the gas flow rate; and a controller connected with the gas flow rate detector and the fan and used for adjusting the working state of the fan according to the deviation between the acquired vehicle speed and the gas flow rate, so that the gas flow rate is equal to the vehicle speed. By using the scheme of the application, the problem that the current particulate matter concentration sensor is only suitable for static detection and has a large error in mobile detection is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of particulate matter concentration detection. More particularly, the present application relates to a method for controlling the gas flow rate in a sampling channel and the related products. BACKGROUND

[0002] This section is intended to provide background information to facilitate a better understanding of the embodiments of the present application set forth in the claims. The description herein can include concepts that can be pursued, but are not necessarily ones that have been previously conceived or pursued. Therefore, unless otherwise indicated herein, the content in this section is not, and should not be interpreted as, a recognition or a suggestion that this content constitutes any form of prior art to the present application.

[0003] Particulate matter concentration detectors generally use particulate matter laser sensors to quickly detect dust concentration online. Common particulate matter laser sensors include a laser, a photosensitive element, a gas sampling channel, and a fan at the inlet of the gas sampling channel. The particulate matter laser sensor is a sensor that detects dust concentration in the air using an optical method. In the sensor, a laser emitter and a light sensor intersect, and when a dust-laden airflow passes through the intersection area, reflected light is generated. The light sensor detects the laser beam reflected by the dust, and the concentration of the dust is determined according to the output strength, thereby outputting a PWM pulse signal.

[0004] Currently, particulate matter laser sensors are mainly used in static scene monitoring, and the speed of the fan is fixed, i.e., the air intake speed of the sensor is fixed. When the particulate matter laser sensor is applied to a vehicle-mounted mobile monitoring application scenario, due to the interference of high-speed airflow during high-speed driving of the vehicle, the particulate matter laser sensor sampling channel will be "passive air intake" during the collection process, resulting in a problem of accumulation of large particles due to the difference between the gas flow rate and the vehicle speed during driving, which leads to large monitoring data errors. Therefore, the existing particulate matter laser sensor cannot meet the application scenario of vehicle-mounted mobile monitoring.

[0005] In view of this, in view of the complex detection working environment of the road dust applied by the system, the existing laser sensor cannot meet the working environment problem, and the design of the particulate matter laser sensor needs to be improved to eliminate the interference of high-speed airflow generated during high-speed driving of the vehicle, and to improve the accuracy of dynamic detection. SUMMARY

[0006] To solve one or more of the above technical problems, the present application proposes to realize closed-loop control of the gas flow rate in the sampling channel by sampling the deviation of the gas flow rate at the air inlet of the sampling channel and the vehicle speed, thereby ensuring the consistency of the gas flow rate and the vehicle speed, effectively reducing the interference of the passive air intake speed of the sampling channel on the detection result during vehicle driving, and improving the accuracy of mobile detection. To this end, the present application provides solutions in the following aspects.

[0007] In a first aspect, the present application provides a device for controlling the gas flow rate in a sampling channel, one end of the sampling channel being provided with an air inlet, the device comprising: a gas flow rate detector arranged at the air inlet for detecting the gas flow rate at the air inlet; at least one fan arranged in the sampling channel for adjusting the gas flow rate; a controller connected with the gas flow rate detector and the fan, and configured to adjust the working state of the fan according to the deviation of the obtained vehicle speed and the gas flow rate, so that the gas flow rate is equal to the vehicle speed.

[0008] In one embodiment, the sampling channel has a first side close to the air inlet and a second side away from the air inlet, the fan includes a first fan and a second fan, the first fan is arranged at the first side for adjusting the gas flow rate at the air inlet, the second fan is arranged at the second side for adjusting the gas flow rate in the sampling channel, and the controller is connected with the first fan and the second fan respectively, and is configured to adjust the power of the first fan and the second fan respectively according to the deviation, so that the gas flow rate is equal to the vehicle speed.

[0009] In one embodiment, the gas flow rate detector includes a gas flow rate sensor arranged at the air inlet for detecting the gas flow rate at the air inlet.

[0010] In one embodiment, it further includes a flow detector arranged at the sampling channel and connected with the controller for detecting the gas flow in the sampling channel.

[0011] In one embodiment, it further includes an alarm connected with the controller, and the controller is further configured to compare the gas flow in the sampling channel with a flow threshold value, and control the alarm to output an alarm when the gas flow is lower than the flow threshold value.

[0012] In one embodiment, it further includes a filtering unit arranged at the first side of the sampling channel for filtering detection interference.

[0013] In a second aspect, the present application also provides a method for controlling the gas flow rate in a sampling channel, comprising: obtaining the vehicle speed and the gas flow rate at the air inlet of the sampling channel; and adjusting the working state of at least one fan in the sampling channel according to the deviation of the vehicle speed and the gas flow rate, so as to make the gas flow rate equal to the vehicle speed.

[0014] In one embodiment, the sampling channel has a first side close to the air inlet and a second side away from the air inlet, and the adjusting the working state of at least one fan in the sampling channel according to the deviation of the vehicle speed and the gas flow rate comprises: determining the deviation of the vehicle speed and the gas flow rate; adjusting the power of a first fan at the first side and a second fan at the second side according to the deviation, respectively.

[0015] In one embodiment, the method further comprises: obtaining the gas flow rate in the sampling channel; comparing the gas flow rate in the sampling channel with a flow threshold, and outputting an alarm when the gas flow rate is lower than the flow threshold.

[0016] In a third aspect, the present application also provides a computer readable storage medium having stored thereon computer readable instructions for a method for controlling the gas flow rate in a sampling channel, which, when executed by one or more processors, implement the method as described in the embodiments of the second aspect.

[0017] With the scheme of the present application, the consistency of the gas flow rate and the vehicle speed in the gas sampling process can be ensured by detecting the vehicle speed and the gas flow rate at the air inlet of the sampling channel during the movement of the vehicle, and the interference of the passive air intake of the sampling channel on the detection result during the movement detection is effectively reduced, thereby improving the accuracy of the movement detection. Further, the stability of the gas flow rate in the sampling channel is ensured by providing one or more fans in the sampling channel in the present application, and the problem of the inertial accumulation of particulate matters in the sampling channel is reduced, thereby improving the accuracy of the detection data. In addition, a method for controlling the gas flow rate in a sampling channel is provided in the scheme of the present application, so as to perform closed-loop control on the gas flow rate according to the deviation of the gas flow rate at the air inlet and the vehicle speed. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which a number of embodiments of the present application are illustrated by way of example and not limitation. Like or corresponding elements in the drawings are denoted by like reference numerals, and:

[0019] Figure 1is a structural schematic diagram of a device for controlling the gas flow rate in a sampling channel according to an embodiment of the present application;

[0020] Figure 2 is a structural schematic diagram of another device for controlling the gas flow rate in a sampling channel according to an embodiment of the present application;

[0021] Figure 3 is a schematic diagram of a method for controlling the sampling of gas in a sampling channel according to an embodiment of the present application;

[0022] Figure 4 is a graph showing the relationship between the particulate matter concentration detection result and the vehicle speed in a case where the scheme in the embodiment of the present application is not employed for control;

[0023] Figure 5 is a graph showing the relationship between the particulate matter concentration detection result and the vehicle speed in a case where the scheme in the embodiment of the present application is employed for control;

[0024] wherein Figures 1 to 2 In the embodiment, 101, a gas flow rate detector; 102, a fan; 103, a controller; 104, a flow rate detector; 201, a sampling channel; 202, an air inlet; 203, an output pipeline; 1021, a first fan; 1022, a second fan. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0026] The specific embodiments of the present application will be described in detail below with reference to the drawings.

[0027] Figure 1is a structural schematic diagram of a device 100 for controlling the gas flow rate in a sampling channel according to an embodiment of the present application. In the context of the present application, the aforementioned device can be provided in a dust concentration detection apparatus in various application scenarios, such as a particulate matter laser sensor. The aforementioned various application scenarios may, for example, be in a vehicle-mounted road dust online monitoring system, in which a particulate matter laser sensor is used as the core of a dust monitoring device carried by a motor vehicle. In operation, the particulate matter laser sensor can be provided on the top of the monitoring vehicle to detect the air dust concentration during vehicle movement. It can also be provided on the bottom of the monitoring vehicle to detect the road surface dust concentration during vehicle movement. When the motor vehicle reaches a certain speed, monitoring can be started to obtain data of the road surface dust (e.g., below 0.3 meters) under the vehicle and the air dust concentration (e.g., 1.5 meters high) on the top of the vehicle. The particulate matter concentration sensor can be provided with a sampling channel for sampling the gas in the environment, thereby realizing the sampling and monitoring process of the particulate matter concentration in the environment.

[0028] As shown in Figure 1 , in the scheme of the present application, one end of the sampling channel is provided with an air inlet, i.e., the sampling channel has a first side close to the air inlet and a second side away from the air inlet. The device 100 for controlling the gas sampling in the sampling channel can include a gas flow rate detector 101, at least one fan 102, and a controller 103.

[0029] The gas flow rate detector 101 can be provided at the air inlet of the sampling channel for detecting the gas flow rate at the air inlet. In some embodiments, the gas flow rate detector 101 can include a gas flow rate sensor, which can be provided at the air inlet of the sampling channel for detecting the gas flow rate at the air inlet.

[0030] The fan 102 can be provided in the sampling channel for adjusting the gas flow rate. In some embodiments, the fan provided in the sampling channel can have various forms, such as centrifugal, axial, inclined (mixed flow), and cross-flow type fans. Single-stage, double-stage, or multi-stage pressure fans can also be used according to the pressure form. The number of fans can also be one or more, thereby ensuring that the gas flow rate in the sampling channel is always equal to the vehicle speed.

[0031] The controller 103 can be connected with the gas flow rate detector 101 and the fan 102, and is used to adjust the working state of the fan 102 according to the deviation of the obtained vehicle speed and gas flow rate, so that the gas flow rate is equal to the vehicle speed.

[0032] In some embodiments, a flow meter 104 may also be installed in the sampling channel. The flow meter 104 is positioned at the sampling channel to detect the gas flow rate within it. Connecting the flow meter 104 to the controller 103 allows for real-time uploading of the gas flow rate in the sampling channel, thereby enabling real-time monitoring of the channel's operation. Furthermore, by detecting the gas flow rate in the sampling channel, the gas velocity detection process can be corrected based on the conversion relationship between flow rate and velocity, thus improving the accuracy of gas velocity control.

[0033] In some embodiments, the device may further include an alarm. Connecting the alarm to the controller 103 facilitates comparison of the gas flow rate in the sampling channel with a flow rate threshold, and controls the alarm to output an alarm when the gas flow rate is below the flow rate threshold.

[0034] In some embodiments, a filter may also be provided in the sampling channel. The filter can be placed on the side of the sampling channel near the air inlet, i.e., the first side, to filter out interfering substances. In actual operation, when the sampling channel samples the gas in the environment, it may simultaneously inhale large particles of dust, catkins, and other interfering substances from the environment.

[0035] The above combination Figure 1 The present invention has been described, and it is understood that the above description is merely exemplary and not restrictive. Those skilled in the art can interpret the present invention in accordance with its teachings. Figure 1 The scenarios shown can be modified without departing from the spirit and essence of the invention. For example, the device for controlling the gas flow rate in the sampling channel of the present invention can also be applied to gas extraction processes in the fields of oil and natural gas.

[0036] Figure 2 This is a schematic diagram illustrating the structure of another device 200 for controlling the gas flow rate in a sampling channel according to an embodiment of the present invention. It should be noted that... Figure 2 The scenario shown can be understood as a combination of the preceding text. Figure 1 An example application of the described device 100. Therefore, in conjunction with the preceding text... Figure 1 The description of device 100 also applies to the following text.

[0037] like Figure 2 As shown, an air inlet 202 is provided at one end of the sampling channel 201. The side of the sampling channel 201 closer to the air inlet 202 is the first side, and the side farther from the air inlet 202 is the second side. During vehicle operation ( Figure 2 The vehicle shown is traveling from right to left. Gas enters the sampling channel 201 from the air inlet 202 (e.g., Figure 2The arrow direction shown in the figure is the gas flow direction, and the gas can enter the detection chamber of the particulate matter laser sensor through the sampling channel 201, and then the particulate matter concentration in the air is detected in the detection chamber. In an application scenario, at least one fan can be arranged in the sampling channel 201 to adjust the gas flow rate. For example, a fan can be arranged at a position close to the air inlet 202 (i.e. the first side) in the sampling channel 201, so that the gas flow rate during sampling can be adjusted. Further, a fan can also be arranged at other positions in the sampling channel 201 to ensure that the gas flow rate at other positions in the sampling channel 201 is equal to the vehicle speed. For example, a fan is arranged at the second side of the sampling channel 201.

[0038] Based on this, the at least one fan can include a first fan 1021 and a second fan 1022. The first fan 1021 and the second fan 1022 are respectively connected with the controller 103, so as to respectively adjust the power of the fan according to the control signal of the controller 103, thereby controlling the consistency of the gas flow rate and the vehicle speed. When the positions of the fans are arranged, the first fan 1021 can be arranged at a position close to the air inlet 202 (i.e. the first side) in the sampling channel 201, for adjusting the gas flow rate at the air inlet 202. The second fan 1022 can be arranged at a position away from the air inlet 202 (i.e. the second side) in the sampling channel 201, for adjusting the gas flow rate at the position away from the air inlet 202 in the sampling channel 201.

[0039] In an application scenario, an air outlet can be arranged at the second side of the sampling channel 201, and an output pipeline 203 can be arranged at the air outlet. By controlling the second fan 1022, the gas in the sampling channel 201 can be discharged from the output pipeline 203. By controlling the operating state of the second fan 1022, the gas flow rate in the sampling channel 201 can be effectively controlled, thereby ensuring the stable transmission of the gas in the sampling channel 201.

[0040] In some embodiments, the controller 103 is further configured to adjust the power of the first fan 1021 and the second fan 1022 respectively according to the deviation between the gas flow rate at the air inlet 202 and the vehicle speed, so as to make the gas flow rate equal to the vehicle speed. In actual application, since the gas flow rate at the air inlet 202 is greatly disturbed by the vehicle speed during vehicle driving, the performance and specifications of the first fan 1021 are required to be higher, thereby effectively maintaining the balance between the gas flow rate at the air inlet 202 and the vehicle speed.

[0041] Figure 3 FIG. 3 is a schematic diagram illustrating a method 300 for controlling gas sampling in a sampling channel according to an embodiment of the present application. It can be understood that Figure 2 The method flow shown in the figure can be implemented in Figure 1 orFigure 2 Implemented in the exemplary scenario shown, therefore regarding Figure 1 or Figure 2 The content described also applies to Figure 3 .

[0042] like Figure 3 As shown, in step S301, the vehicle speed and the gas flow rate at the air inlet of the sampling channel are acquired. In one application scenario, the vehicle speed and the gas flow rate in the sampling channel can be acquired to perform closed-loop control of the gas flow rate based on the vehicle speed. The vehicle speed information can be obtained from the vehicle controller, thereby effectively improving the accuracy of the control process. In step S302, the operating state of at least one fan in the sampling channel is adjusted according to the deviation between the vehicle speed and the gas flow rate to make the gas flow rate equal to the vehicle speed. In some embodiments, by calculating the deviation between the vehicle speed and the gas flow rate, the impact of the passive air intake process on the particulate matter concentration detection process can be determined. Adjusting the operating state of the fan according to this deviation to make the gas flow rate in the sampling channel equal to the vehicle speed, that is, keeping the sampling speed of the particulate matter concentration sensor and the vehicle speed in balance, can effectively avoid the influence of the passive air intake process on the collection process of particulate matter of different sizes in the environment, thereby effectively improving the detection accuracy.

[0043] In some embodiments, the gas flow rate at the inlet and the gas flow rate on the side of the sampling channel away from the inlet can be adjusted separately based on the deviation between vehicle speed and gas flow rate. Specifically, the operating power of the first and second fans is adjusted according to the deviation, thereby regulating the gas flow rate at multiple locations corresponding to the sampling channel. For example, during the control process, the two fans in the sampling channel can be controlled to operate at the same power to ensure the stability of the pressure within the sampling channel. Furthermore, different power parameter commands can be output to the two fans respectively according to the actual operating conditions, thereby controlling the two fans to operate at their corresponding power. By adjusting the gas flow rate at multiple locations in the sampling channel, the accumulation of particulate matter in the sampling channel due to inertia can be avoided, effectively ensuring the stability of the gas flow rate in the sampling channel.

[0044] In some embodiments, to prevent interference with the detection results due to factors such as fan failure during gas collection, alarms can be issued promptly based on the gas flow rate information in the sampling channel. In operation, a flow meter can be used to acquire the gas flow rate in the sampling channel, which is then compared with a flow rate threshold. An alarm is output when the gas flow rate falls below the threshold.

[0045] To further reduce interference with the sampling process, the present invention can also filter out detection interference in the sampling channel to reduce interference with the detection results.

[0046] Figure 4 Fig. 2 is a schematic diagram showing the relationship between the particulate matter concentration detection result and the vehicle speed, in which the scheme in the embodiment of the present application is not employed for control. Figure 5

[0047] As shown in Fig. 3, a particulate matter laser sensor not controlled by the scheme of the present application is arranged on the roof of a motor vehicle, and a road dust detection process is carried out by walk-by monitoring test. It can be seen from Fig. 4 that, during the high-speed driving of the motor vehicle, the passive air intake does have an impact on the detection result of the particulate matter concentration sensor. Figure 4 As shown in the block region in Fig. 5, the vehicle speed of the motor vehicle changes rapidly in a short time, for example, in the state of excited vehicle in the process of rapid acceleration overtaking or rapid deceleration braking, the concentration of PM10 detected by the particulate matter laser sensor on the roof also changes greatly. The reason is that when the vehicle speed is large and higher than the air intake speed, due to the inertial accumulation of large particles, the particulate matter laser sensor monitors that the particulate number concentration becomes large, and the detection result is inaccurate. Figure 4 Figure 4 Similarly, as shown in Fig. 6, a particulate matter laser sensor controlled by the scheme of the present application is also arranged on the roof of a motor vehicle, and a road dust detection process is carried out by walk-by monitoring test. It can be seen from Fig. 7 that, during the high-speed driving of the motor vehicle, although the speed of the motor vehicle changes greatly at different times, the corresponding monitoring result of the particulate matter laser sensor on the roof is relatively accurate and stable. By employing the scheme of the present application, the influence of the vehicle speed on the monitoring result is effectively inhibited, and the accuracy of the particulate matter concentration detection result in the mobile (dynamic) detection process is effectively improved.

[0048] In another aspect of the present application, the present application also provides a computer readable storage medium, which stores computer readable instructions for controlling the method of controlling the flow rate of the gas in the sampling channel, and the computer readable instructions are executed by one or more processors to realize the method in one or more of the foregoing embodiments. Figure 5 Figure 5 In another aspect of the present application, the present application also provides a computer readable storage medium, which stores computer readable instructions for controlling the method of controlling the flow rate of the gas in the sampling channel, and the computer readable instructions are executed by one or more processors to realize the method in one or more of the foregoing embodiments.

[0049] In another aspect of the present application, the present application also provides a computer readable storage medium, which stores computer readable instructions for controlling the method of controlling the flow rate of the gas in the sampling channel, and the computer readable instructions are executed by one or more processors to realize the method in one or more of the foregoing embodiments.

[0050] ​​​In the above description of the present specification, unless otherwise explicitly specified and limited, the terms "fixed", "mounted", "connected" or "linked" and the like should be understood in a broad sense. For example, as to the term "connected", it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or it can be internal connection of two elements or interaction relationship between two elements. Therefore, unless otherwise explicitly limited in the present specification, the above terms can be understood in the specific meaning in the present application by the person skilled in the art according to the specific circumstances.

[0051] According to the above description of the present specification, the person skilled in the art can also understand the terms used as follows, for example, the terms indicating the orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise" are based on the orientation or positional relationship shown in the drawings of the present specification, which are only for the purpose of facilitating the description of the present application and simplifying the description, and are not explicitly or implicitly indicated that the devices or elements involved must have the specific orientation, be constructed and operated in the specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present application.

[0052] In addition, the terms "first" or "second" and the like used in the present specification are terms used to refer to numbers or ordinal numbers only for the purpose of description, and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present specification, the meaning of "plurality" is at least two, for example, two, three or more, etc., unless otherwise explicitly specified and limited.

[0053] Although the present application has shown and described the preferred embodiments of the present application, it will be apparent to those skilled in the art that many modifications, changes and substitutions can be made without departing from the spirit and scope of the present application. It should be understood that various alternatives to the embodiments of the present application described herein can be employed in practicing the present application. The appended claims are intended to define the scope of the present application and thus cover any equivalents or alternatives within the scope of these claims.

Claims

1. An apparatus for controlling the flow rate of a gas in a sampling channel, characterized by, An end of the sampling channel is provided with an air inlet, and the device comprises: a gas flow rate detector arranged at the air inlet and configured to detect the gas flow rate at the air inlet; at least one air blower arranged in the sampling channel and configured to adjust the gas flow rate; a controller connected to the gas flow rate detector and the air blower, and configured to adjust the working state of the air blower according to the deviation between the acquired vehicle speed and the gas flow rate, so that the gas flow rate is equal to the vehicle speed; wherein the sampling channel has a first side close to the air inlet and a second side away from the air inlet, the air blower comprises a first air blower arranged at the first side and configured to adjust the gas flow rate at the air inlet, and a second air blower arranged at the second side and configured to adjust the gas flow rate in the sampling channel, and the controller is connected to the first air blower and the second air blower respectively, and configured to adjust the power of the first air blower and the second air blower respectively according to the deviation, so as to adjust the gas flow rate at the corresponding positions of the sampling channel, to avoid the accumulation of particulate matters in the sampling channel due to inertia, and to make the gas flow rate equal to the vehicle speed.

2. The apparatus of claim 1, wherein, The gas flow rate detector comprises a gas flow rate sensor arranged at the air inlet and configured to detect the gas flow rate at the air inlet.

3. The apparatus of claim 1, wherein, Further comprising a flow detector arranged at the sampling channel and connected to the controller, and configured to detect the gas flow in the sampling channel.

4. The apparatus of claim 3, wherein, Further comprising an alarm connected to the controller, and the controller is further configured to compare the gas flow in the sampling channel with a flow threshold value, and control the alarm to output an alarm when the gas flow is lower than the flow threshold value.

5. The apparatus of claim 1, wherein, Further comprising a filtering unit arranged at the first side of the sampling channel and configured to filter detection interference.

6. A method for controlling the flow rate of a gas in a sampling channel, characterized by, comprises: acquiring the vehicle speed and the gas flow rate at the air inlet of the sampling channel; and adjusting the working state of at least one air blower in the sampling channel according to the deviation between the vehicle speed and the gas flow rate, so that the gas flow rate is equal to the vehicle speed; wherein the sampling channel has a first side close to the air inlet and a second side away from the air inlet, and wherein adjusting the working state of at least one air blower in the sampling channel according to the deviation between the vehicle speed and the gas flow rate comprises: determining the deviation between the vehicle speed and the gas flow rate; adjusting the power of the first air blower at the first side and the second air blower at the second side respectively according to the deviation, so as to adjust the gas flow rate at the corresponding positions of the sampling channel, to avoid the accumulation of particulate matters in the sampling channel due to inertia.

7. The method of claim 6, wherein, The method further comprises: acquiring the gas flow in the sampling channel; comparing the gas flow in the sampling channel with a flow threshold value, and outputting an alarm when the gas flow is lower than the flow threshold value.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium has stored thereon computer readable instructions for controlling a method of sampling a gas flow rate in a sampling channel, the computer readable instructions, when executed by one or more processors, implementing the method of claim 6 or 7.

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