Exhaust gas detection device and system

Abstract

The embodiment of the present application provides an exhaust gas detection device and system, the exhaust gas detection device comprising: an exhaust gas guide tube connected to an exhaust pipe, configured to provide an extended channel for the exhaust gas discharged from the exhaust pipe; a plurality of collection units configured to be arranged on the exhaust gas guide tube and in contact with the exhaust gas in the exhaust gas guide tube to detect characteristic parameters of the exhaust gas; a length-adjustable connection device configured to connect the exhaust gas guide tube to the carrier where the exhaust pipe is located. The exhaust gas detection device provided in the embodiment of the present application has a simple structure and a small volume, which is convenient for on-site test loading and unloading and arrangement, and the embodiment of the present application uses simple components to measure the exhaust characteristics of the automobile, and can prevent the exhaust gas detection device from falling from the vehicle body (i.e., the carrier) due to severe vehicle shaking through the length-adjustable connection device.

Description

Technical Field

[0001] The present application relates to the field of automobile exhaust gas detection, and specifically, embodiments of the present application relate to an exhaust gas detection device and system. Background Art

[0002] With the increasing attention paid to air pollution control, the emission standards for heavy-duty vehicles and non-road mobile machinery are becoming increasingly stringent. When conducting emission spot checks on heavy-duty vehicles and non-road mobile machinery in use, if on-board exhaust gas detection equipment (Pems equipment) is used for testing, the process of loading and unloading instruments and equipment takes too long, affecting the test efficiency.

[0003] Therefore, how to provide a portable and low-cost automobile exhaust detection device has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide an exhaust gas detection device and system. The exhaust gas detection device of the embodiments of the present application is a portable mobile source emission test combination device. The device is small in size, low in economic cost, simple in structure, and convenient for on-site testing loading and unloading and layout. It can at least be used for rapid random emission testing of mobile sources.

[0005] In a first aspect, some embodiments of the present application provide an exhaust gas detection device, comprising: an exhaust gas guide pipe, connected to an exhaust pipe, configured to provide an extended channel for exhaust gas discharged from the exhaust pipe; a plurality of collection units, configured to be disposed on the exhaust gas guide pipe and in contact with the exhaust gas in the exhaust gas guide pipe to detect characteristic parameters of the exhaust gas; and a length-adjustable connecting device, configured to connect the exhaust gas guide pipe to a carrier on which the exhaust pipe is located.

[0006] The exhaust gas detection device provided in the embodiment of the present application has a simple structure and a small size, which is convenient for on-site testing, loading and unloading, and arrangement. The embodiment of the present application uses simple components to measure the exhaust gas characteristics of the automobile, and can prevent the exhaust gas detection device from falling from the vehicle body (i.e., the carrier) due to severe shaking of the vehicle through a length-adjustable connecting device.

[0007] In some embodiments, the exhaust gas detection device further includes: a mounting seat, wherein the mounting seat is disposed on the exhaust gas duct and the collection unit is fixed to the exhaust gas duct via the mounting seat.

[0008] In some embodiments of the present application, a plurality of information collection units can be fixed on the exhaust gas guide tube through a sampling tube and a mounting base, thereby achieving contact between the collection units and the exhaust gas in the exhaust gas guide tube.

[0009] In some embodiments, the exhaust gas detection device further includes: a connection unit with a variable diameter, configured to connect the exhaust gas guide pipe and the exhaust pipe.

[0010] Some embodiments of the present application can achieve connection between the exhaust gas guide pipe of the exhaust gas detection device and the mobile source exhaust pipes of different diameters by changing the diameter of the connecting unit, thereby increasing the application scenarios of the exhaust gas detection device.

[0011] In some embodiments, the variable diameter connection unit includes: a soft rubber tube; wherein the exhaust gas detection device also includes a clamp, and the clamp is configured to fasten one end of the soft rubber tube to the exhaust gas guide tube and fasten the other end of the soft rubber tube to the exhaust pipe.

[0012] Some embodiments of the present application connect the exhaust pipes of mobile sources of different diameters through soft rubber tubes of different variable diameters, which are fastened with clamps to achieve connectivity between the exhaust guide pipe and the exhaust pipe.

[0013] In some embodiments, the multiple acquisition units include: a nitrogen oxide sensor, a particulate matter sensor, a temperature sensor, and a gas flow sensor.

[0014] Some embodiments of the present application can realize the collection of multiple types of information in exhaust gas by setting up multiple types of collection units.

[0015] In some embodiments, the length-adjustable connecting device is a length-adjustable suspension device.

[0016] Some embodiments of the present application prevent the device (i.e., the exhaust gas detection device) from falling off the vehicle body due to severe shaking of the vehicle by suspending the exhaust gas detection device on a mobile source carrier.

[0017] In some embodiments, the length-adjustable suspension device includes: at least one chain; at least one hanging ring located at one end of the at least one chain; and a hook located at the other end of the at least one chain; wherein the at least one hanging ring is fixed to the outer wall of the exhaust gas duct, the length of the at least one chain is adjustable, and the hook can be hung on the carrier.

[0018] In some embodiments, the length-adjustable suspension device includes: at least one chain; at least one hanging ring located at one end of the at least one chain; and an adsorption unit located at the other end of the at least one chain; wherein the at least one hanging ring is fixed to the outer wall of the exhaust gas duct, the length of the at least one chain is adjustable, and the adsorption unit can be adsorbed on the carrier.

[0019] In some embodiments of the present application, a lifting ring can be welded to the outer wall of the exhaust gas guide tube (e.g., a stainless steel tube), and the stainless steel tube (i.e., the exhaust gas guide tube) can be hung on the mobile source vehicle body by a hook (or adsorption unit) and at least one chain (e.g., a stainless steel chain) to prevent the device (i.e., the exhaust gas detection device) from falling off the vehicle body due to severe shaking of the vehicle. In some embodiments of the present application, the exhaust gas detection device can be connected to different vehicle models by adjusting the length of the chain.

[0020] In some embodiments, the exhaust gas detection device includes: a power module configured to supply power to the multiple collection units.

[0021] In some embodiments of the present application, power is supplied to each unit in the exhaust gas detection device through a power supply module.

[0022] In some embodiments, the exhaust gas detection device further includes: a signal conversion module configured to perform multi-channel coupling, analysis and conversion of the signals collected by the multiple collection units into a first signal, wherein the first signal is a signal that can be recognized by the information processing terminal.

[0023] Some embodiments of the present application complete the unified format conversion of the collected signals through the set signal conversion module, which facilitates the information processing terminal to perform unified processing on the collected information.

[0024] In some embodiments, the first signal includes at least one of a USB signal and a WIFI signal.

[0025] Some embodiments of the present application can process the collected information with the help of a PC by converting the collected signal into a USB signal, or can further process the collected information with the help of a mobile terminal by converting the collected signal into a WIFI signal.

[0026] In a second aspect, some embodiments of the present application provide an exhaust gas detection system, comprising: the exhaust gas detection device described in the first aspect above; and a signal processing terminal, configured to monitor in real time the working status of multiple acquisition units included in the exhaust gas detection device, and send instructions to the multiple acquisition units to control the multiple channels corresponding to the multiple acquisition units to synchronously start exhaust gas measurement and synchronously end measurement.

[0027] Some embodiments of the present application control the working state of the information collection unit in the exhaust gas detection device through a signal processing terminal, thereby realizing the synchronous collection of exhaust gas by multiple collection units to facilitate the analysis of the composition or characteristics of the exhaust gas.

[0028] In some embodiments, the signal processing terminal is further configured to control the multiple acquisition units to detect the exhaust gas at a set frequency and duration.

[0029] Some embodiments of the present application include a signal processing terminal that sets the operating frequency and duration of the collection unit, thereby achieving synchronous collection of exhaust gas information by multiple collection units.

[0030] In some embodiments, the signal processing terminal includes a host computer based on a Windows operating system or a mobile terminal based on an Android operating system.

[0031] Some embodiments of the present application may use a PC or a mobile terminal as a signal processing device to obtain exhaust gas components or characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the exhaust gas detection system provided in an embodiment of the present application;

[0034] Figure 2 A schematic diagram of the structure of installing a collection unit on a flow guide pipe provided in an embodiment of the present application;

[0035] Figure 3 One of the schematic diagrams of the exhaust gas detection device provided in the embodiment of the present application;

[0036] Figure 4 A second schematic diagram of an exhaust gas detection device provided in an embodiment of the present application;

[0037] Figure 5 A second schematic diagram of an exhaust gas detection system provided in an embodiment of the present application;

[0038] Figure 6 This is the third schematic diagram of the exhaust gas detection system provided in the embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0040] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0041] In order to improve the test efficiency, some embodiments of the present application provide a portable mobile source emission test combination device, which has a small size, low economic cost, simple structure, and is easy to load and unload and arrange for on-site testing. It is used for rapid random emission testing of mobile sources.

[0042] Please see Figure 1 , Figure 1 A schematic diagram of the composition of an exhaust gas detection system provided in some embodiments of the present application. Figure 1 The exhaust gas detection system includes an exhaust gas detection device 100 and an information processing terminal 170.

[0043] The exhaust gas detection device 100 is used to communicate with the exhaust pipe included in the detected mobile source or carrier to detect the exhaust gas discharged from the exhaust pipe, for example, to detect characteristic parameters such as gas, particulate matter or exhaust gas flow rate in the exhaust gas.

[0044] The information processing terminal 170 is used to receive exhaust characteristic data detected by the exhaust detection device 100 and control the working state of the collection unit in the exhaust detection device.

[0045] Figure 1 The exhaust gas detection device 100 transmits the exhaust gas characteristic data detected as exhaust gas to the information processing terminal 170 through the network 160, or the information processing terminal 170 sends the instruction of controlling the collection unit to collect information to the collection unit included in the exhaust gas detection device 100 through the network 160. The network 160 includes, but is not limited to, a mobile communication access network (for example, a 4G or 5G communication network) and a core network.

[0046] It should be noted that Figure 1 The exhaust gas detection device 100 and the information processing terminal 170 are shown to be interconnected through the network 160, and information is transmitted through the network 160. However, the embodiment of the present application does not limit the connection method between the information processing terminal 170 and the exhaust gas detection device 100. For example, in some embodiments, the exhaust gas detection device and the information processing terminal are not interconnected through the network 160 but directly transmit data through a data line.

[0047] Combine the following Figure 2 The components of the exhaust gas detection device 100 are explained by way of example.

[0048] like Figure 2As shown, some embodiments of the present application provide an exhaust gas detection device, which includes: an exhaust gas guide pipe 110, which is connected to an exhaust pipe (not shown in the figure) and is configured to provide an extended channel for exhaust gas discharged from the exhaust pipe; a plurality of collection units 121, which are configured to be arranged on the exhaust gas guide pipe and contact the exhaust gas in the exhaust gas guide pipe 110 to detect characteristic parameters of the exhaust gas; and a length-adjustable connecting device 130, which is configured to connect the exhaust gas guide pipe 110 to a carrier (not shown in the figure) where the exhaust pipe is located. Figure 2 The direction of exhaust gas flow is also shown.

[0049] Figure 2 Only four collection units 121 are shown, which are arranged along the exhaust gas flow direction of the exhaust gas guide pipe 110, but the number of collection units is not limited in some embodiments of the present application. For example, those skilled in the art can add or delete the specific number of collection units 121 according to the requirements of the exhaust gas measurement index. The characteristic parameters of the exhaust gas may include parameters such as gas, particulate matter or exhaust gas flow rate in the exhaust gas.

[0050] The length-adjustable connecting device 130 may specifically include: at least one chain, at least one lifting ring at one end of the at least one chain, and a hook at the other end of the at least one chain; wherein at least one lifting ring is fixed to the outer wall of the exhaust gas guide tube, the length of the at least one chain is adjustable, and the hook may be hung on the carrier. It should be noted that the hook may also be replaced by an adsorption unit.

[0051] The exhaust gas guide pipe 110 may include a pipe made of stainless steel or other materials.

[0052] In some embodiments of the present application, the exhaust gas detection device further includes: a mounting seat, wherein the mounting seat is disposed on the exhaust gas guide tube and the collection unit is fixed to the exhaust gas guide tube via the mounting seat.

[0053] Combine the following Figure 3 An exemplary description is given of a mounting base structure for fixing a plurality of acquisition units.

[0054] As an example, Figure 3As shown, the mounting base 140 can adopt a threaded base. The specific connection method is to drill a hole on the wall of the guide tube 110 and weld a base (or a mounting base) at the hole. The base is hollow and has threads on the inner wall. Correspondingly, sensors such as nitrogen oxide sensors, PM sensors, temperature sensors and gas flow meters have threaded structures at the installation position, but not all sensors have the same thread size. According to the thread size of the selected installation position of the collection unit 121, the corresponding base is selected. After the base is welded to the guide tube, the sensor is screwed and installed on the guide tube wall 111 by threading. The sampling end of the sensor is located inside the guide tube 110. During sampling, the sampling end of the collection unit 121 is immersed in the exhaust fluid, and real-time sampling can be directly performed from the flowing exhaust gas.

[0055] In order to connect the exhaust gas guide pipe to exhaust pipes of various mobile sources with different diameters, in some embodiments of the present application, the exhaust gas detection device further includes: a connection unit with a variable diameter (not shown in the figure), which is configured to connect the exhaust gas guide pipe with the exhaust pipe. For example, the connection unit with a variable diameter includes: a soft rubber tube; wherein the exhaust gas detection device further includes a clamp, and the clamp is configured to fasten one end of the soft rubber tube to the exhaust gas guide pipe and the other end of the soft rubber tube to the exhaust pipe.

[0056] Combine the following Figure 4 Exemplary Figure 2 The length of the connecting device 130 can be adjusted.

[0057] In order to enable the exhaust gas detection device to measure the exhaust gas of mobile sources at various heights, in some embodiments of the present application, the length-adjustable connecting device 130 is a length-adjustable suspension device. Figure 4 As shown, the length-adjustable suspension device includes: at least one chain 132; at least one hanging ring 131 located at one end of the at least one chain 132; and a hook 133 located at the other end of the at least one chain 132; wherein the at least one hanging ring 131 is fixed to the outer wall of the exhaust gas guide duct 110, the length of the at least one chain 132 is adjustable, and the hook 133 can be hung on a mobile source (or carrier).

[0058] Specifically, in some embodiments of the present application, a hanging ring is welded to the outer wall of the exhaust gas guide tube (for example, a stainless steel tube), and the stainless steel tube (i.e., the exhaust gas guide tube) is hung on the mobile source vehicle body by a hook and at least one chain (for example, a stainless steel chain) to prevent the device (i.e., the exhaust gas detection device) from falling off the vehicle body due to severe shaking of the vehicle. Some embodiments of the present application also achieve the connection of the exhaust gas detection device with different vehicle models by adjusting the length of the chain.

[0059] and Figure 4The difference is that in some embodiments of the present application Figure 4 The hanging ring 133 can also be set as an adsorption unit (not shown in the figure), for example, by using a strong adsorption device. When using the adsorption device, the hanging ring is welded to the outer wall of the exhaust gas guide tube (for example, a stainless steel tube), and the stainless steel tube (i.e., the exhaust gas guide tube) is suspended on the mobile source vehicle body by a strong magnetic adsorption device and at least one metal spring (for example, a stainless steel spring) to prevent the vehicle from violently shaking and causing the device (i.e., the exhaust gas detection device) to fall from the vehicle body. Some embodiments of the present application also achieve the connection of the exhaust gas detection device with different vehicle models by adjusting the length of the spring. The vehicle body material generally includes stainless steel, and the strong magnetic adsorption device can be tightly adsorbed to the vehicle body, thereby firmly fixing the device.

[0060] It should be noted that the acquisition unit 121 can also Figure 4 The sampling tube 123 is fixed on the guide tube, and the oblique opening of the sampling tube 123 needs to be arranged to face the exhaust gas flow direction so as to enable the sensor to measure and collect the exhaust gas.

[0061] Combine the following Figure 5 and Figure 6 The composition of the exhaust gas detection system provided in some embodiments of the present application is exemplified.

[0062] Some embodiments of the present application provide an exhaust gas detection system, the exhaust gas detection system comprising: Figure 2 and Figure 3 The exhaust gas detection device and the signal processing terminal are configured to monitor the working status of multiple acquisition units included in the exhaust gas detection device in real time, and send instructions to the multiple acquisition units to control the multiple channels corresponding to the multiple acquisition units to synchronously start exhaust gas measurement and synchronously end the measurement process.

[0063] In some embodiments of the present application, the exhaust gas detection device further includes a power supply module configured to supply power to the multiple collection units. Figure 5 As shown, the power module includes a DC power supply 150. For example, Figure 5 The DC power supply 150 is a 24V power supply.

[0064] In some embodiments of the present application, the plurality of collection units include NO x (nitrogen oxide) sensor, PM (particulate matter) sensor, temperature sensor and gas flow meter. Figure 5 and Figure 6 The multiple collection units shown include: 1 NO x (nitrogen oxide) sensor, a PM (particulate matter) sensor, a temperature sensor and a Pitot tube gas flow meter.

[0065] In order to transmit the information collected by the multiple acquisition units to the signal processing terminal, in some embodiments of the present application, the exhaust gas detection device further includes: a signal conversion module, which is configured to perform multi-channel coupling, analysis and conversion of the signals collected by the multiple acquisition units into a first signal, wherein the first signal is a signal that can be recognized by the information processing terminal. As some examples, the signal conversion module includes Figure 5 The first signal conversion module 161 or Figure 6 The second signal conversion module 162.

[0066] like Figure 5 The first signal conversion module 161 is used to convert NO x The signals collected by the nitrogen oxide sensor, PM (particulate matter) sensor, temperature sensor and pitot tube gas flow meter (i.e., four collection units) are converted into USB signals, and the USB signals are transmitted to the host computer 180 (i.e., signal processing terminal) through the signal line 171. For example, Figure 5 The first signal conversion module is a CAN-USB signal conversion module. Figure 5 The DC power supply is used for NO x The sensor, PM sensor and Pitot tube gas flow meter are powered, and the first signal conversion module 161 converts NO x The signals of the sensor, PM sensor, temperature sensor and flow meter are multi-channel coupled, analyzed and converted into USB signals, and transmitted to the PC (i.e. Figure 5 host computer).

[0067] Figure 5 The signal processing terminal is a PC (i.e., a Windows host computer), which can monitor the working status of each component (e.g., multiple acquisition units) in real time and send a signal to the NO x The sensor, PM sensor, temperature sensor and gas flow meter send instructions to prepare for work, control the start and end process of multi-channel synchronous measurement corresponding to multiple acquisition units, and control the multiple acquisition units to detect the exhaust gas at a set frequency and duration (for example, continuous measurement for 1 hour at a frequency of 1 Hz), display the value of each measurement channel in real time using a curve, and save the measurement data to the local PC.

[0068] like Figure 6 As shown, the second signal conversion module 162 is used to convert NO x The signals collected by the nitrogen oxide (NOx) sensor, the PM (particulate matter) sensor, the temperature sensor, and the gas flow meter (e.g., a pitot tube gas flow meter) are converted into WIFI signals, and the WIFI signals are transmitted to the mobile terminal 190 via wireless communication. For example, Figure 6The second signal conversion module 162 is a CAN-WIFI communication conversion module, NO x The (nitrogen oxide) sensor, the PM (particulate matter) sensor, the temperature sensor and the gas flow meter send the collected data information to the second signal conversion module 162 via CAN two-way communication. Figure 6 The power supply module 191 is used to supply power to the second signal conversion module 162, NO x The sensor, PM sensor and Pitot tube gas flow meter are powered, and the second signal conversion module 162 converts NO x The signals of the sensor, PM sensor, temperature sensor and flow meter are multi-channel coupled, analyzed and converted into USB signals, and transmitted to the PC (i.e. Figure 6 mobile terminals).

[0069] Figure 6 The mobile terminal 190 is based on the Android operating system. The mobile terminal 190 monitors the working status of each component (such as multiple collection units) in real time and sends a message to NO x The sensor, PM sensor, temperature sensor and gas flow meter send instructions to prepare for work, control the start and end process of multi-channel synchronous measurement, and control the multiple acquisition units to detect the exhaust gas at a set frequency and duration (for example, continuously measuring the exhaust gas in the exhaust guide pipe at a frequency of 1HZ for 1h), display the measurement values ​​of each measurement channel in real time using a curve, and save the measurement data to the mobile APP.

[0070] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0071] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0072] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0073] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0074] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0075] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. An exhaust gas detection device, characterized in that: The exhaust gas detection device comprises: an exhaust gas guide pipe connected to the exhaust pipe and configured to provide an extended passage for the exhaust gas discharged from the exhaust pipe; A plurality of collection units are configured to be disposed on the exhaust gas guide pipe and to contact the exhaust gas in the exhaust gas guide pipe to detect characteristic parameters of the exhaust gas; A length-adjustable connection device is configured to connect the exhaust gas guide pipe to the carrier on which the exhaust pipe is located through an adsorption unit; the exhaust gas detection device is used to connect to different vehicle models by adjusting the adsorption unit; The exhaust gas detection device also includes: A connection unit with a variable diameter is configured to connect the exhaust gas guide pipe to the exhaust pipes of various mobile sources with different diameters; The length-adjustable connecting device is a length-adjustable suspension device; The length-adjustable suspension device comprises: at least one chain; at least one hanging ring at one end of the at least one chain; and a hook at the other end of the at least one chain; wherein the at least one hanging ring is fixed to the outer wall of the exhaust gas guide tube, the length of the at least one chain is adjustable, and the hook can be hung on the carrier; or, The length-adjustable suspension device includes: at least one chain; at least one lifting ring located at one end of the at least one chain; and an adsorption unit located at the other end of the at least one chain; wherein the at least one lifting ring is fixed to the outer wall of the exhaust gas guide duct, the length of the at least one chain is adjustable, and the adsorption unit can be adsorbed on the carrier.

2. The exhaust gas detection device according to claim 1, characterized in that: The exhaust gas detection device also includes: A mounting seat is arranged on the exhaust gas guide tube and the collection unit is fixed on the exhaust gas guide tube through the mounting seat.

3. The exhaust gas detection device according to claim 1, characterized in that: The variable diameter connection unit comprises: a soft rubber tube; wherein, The exhaust gas detection device further comprises a clamp, which is configured to fasten one end of the soft rubber tube to the exhaust gas guide pipe and to fasten the other end of the soft rubber tube to the exhaust pipe.

4. The exhaust gas detection device according to claim 1, characterized in that: The multiple acquisition units include: a nitrogen oxide sensor, a particulate matter sensor, a temperature sensor and a gas flow sensor.

5. The exhaust gas detection device according to claim 1, characterized in that: The exhaust gas detection device includes: a power supply module configured to supply power to the multiple collection units.

6. The exhaust gas detection device according to claim 1, characterized in that: The exhaust gas detection device further includes: a signal conversion module configured to perform multi-channel coupling, analysis and conversion of the signals collected by the multiple collection units into a first signal, wherein the first signal is a signal that can be recognized by the information processing terminal.

7. The exhaust gas detection device according to claim 6, characterized in that: The first signal includes at least one of a USB signal and a WIFI signal.

8. An exhaust gas detection system, characterized in that: The exhaust gas detection system comprises: An exhaust gas detection device as claimed in any one of claims 1 to 7; and The signal processing terminal is configured to monitor the working status of multiple acquisition units included in the exhaust gas detection device in real time, and send instructions to the multiple acquisition units to control the multiple channels corresponding to the multiple acquisition units to synchronously start exhaust gas measurement and synchronously end measurement.

9. The exhaust gas detection system according to claim 8, characterized in that: The signal processing terminal is further configured to control the plurality of collection units to detect the exhaust gas at a set frequency and duration.

10. The exhaust gas detection system according to claim 8, characterized in that: The signal processing terminal includes a host computer based on a Windows operating system or a mobile terminal based on an Android operating system.

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