A vehicle exhaust emission system

Abstract

This utility model discloses a vehicle exhaust emission system, comprising: multiple environmental chambers, each with a connecting pipe for connecting to the exhaust gas passage of a vehicle under test; an emission assembly including an emission pipe and a control valve, the emission pipe including a main emission passage and multiple branch emission passages, each branch emission passage corresponding to one of the environmental chambers, the connecting pipe in each environmental chamber connecting to the corresponding branch emission passage, and each branch emission passage connecting to the main emission passage; and a control valve for controlling the connection state of at least one branch emission passage; and an extraction device disposed in the emission pipe, configured to simultaneously extract exhaust gas from at least one branch emission passage and discharge the extracted exhaust gas through the main emission passage. This vehicle exhaust emission system enables exhaust gas to meet the emission requirements of single-chamber single-discharge or multi-chamber simultaneous emission, with a simpler and more efficient emission path and reduced pipe redundancy.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a vehicle exhaust emission system. Background Technology

[0002] In the field of automotive R&D and testing, environmental chambers, as core testing facilities capable of accurately simulating complex environmental conditions such as extreme temperatures, humidity, air pressure, and road conditions, have become essential equipment for verifying the power performance, emission characteristics, and reliability of vehicles such as gasoline-powered cars and range-extended electric vehicles. During vehicle testing within the environmental chamber, the start-up and operation of the engine or range extender continuously generate exhaust gases, which contain toxic and harmful gases such as carbon monoxide and nitrogen oxides, as well as pollutants such as particulate matter.

[0003] If exhaust gases are not effectively discharged from the test chamber in a timely manner, their accumulation inside the chamber will cause the concentration of harmful components to rise continuously. When the concentration exceeds the safety threshold, it will not only directly threaten the life and health of the test personnel, but may also cause chemical reactions or physical interference with the equipment inside the chamber, leading to a decrease in the accuracy of the test instruments, which in turn affects the authenticity and reliability of the test data and adversely affects the automotive research and development process.

[0004] To address exhaust emission issues, some domestic laboratories have installed exhaust emission systems. However, existing technologies still have significant limitations: current mainstream exhaust emission systems generally adopt a single-compartment, single-system architecture, meaning each environmental chamber is equipped with its own independent exhaust gas collection and emission device. This model requires the repeated configuration of core equipment such as fans, ducts, and purification units for each chamber, resulting not only in a large overall system footprint and low equipment utilization, but also a significant increase in initial construction investment and long-term maintenance costs, making it difficult to meet the needs of large-scale, high-efficiency laboratory operations. Utility Model Content

[0005] This application discloses a vehicle exhaust emission system that can meet the exhaust emission requirements of a single compartment with a single exhaust or multiple compartments with simultaneous exhaust through a centralized pipeline architecture of a main exhaust channel and branch exhaust channels. The control valve has an independent control function for a single branch exhaust channel, which allows the system to flexibly start and stop the exhaust emission of the corresponding compartment according to the test status of each environmental compartment.

[0006] To achieve the above objectives, this application discloses a vehicle exhaust emission system, comprising:

[0007] Multiple environmental chambers, each of which defines a space for accommodating a vehicle under test, and each environmental chamber is provided with a connecting pipe for communicating with the exhaust gas passage of the vehicle under test;

[0008] The emission assembly includes an emission pipeline and a control valve. The emission pipeline includes a main emission channel and multiple branch emission channels. The multiple branch emission channels are configured one-to-one with multiple environmental chambers. The connecting pipelines in each environmental chamber are connected to the corresponding branch emission channel, and each branch emission channel is connected to the main emission channel. The control valve is used to control the connection status of at least one branch emission channel.

[0009] An exhaust device is provided in the discharge pipeline and is configured to simultaneously extract exhaust gas from at least one of the branch discharge channels and discharge the extracted exhaust gas through the main discharge channel.

[0010] In one possible implementation, at least some of the environmental chambers in the plurality of environmental chambers constitute at least two environmental chamber groups, and each environmental chamber group includes at least two environmental chambers, with each environmental chamber in each environmental chamber group being connected to the corresponding branch emission channel.

[0011] The discharge pipeline also includes at least two collection channels, which are connected between the branch discharge channels and the main discharge channel, and the branch discharge channels corresponding to each environmental module are all connected to the same collection channel.

[0012] In one possible implementation, the plurality of said environmental chambers include any one or more of the following:

[0013] Two-wheel drive compartment, which is used to test the power performance, two-wheel drive system compatibility or chassis durability of the vehicle under test;

[0014] The four-wheel drive cabin is used to test the power performance, four-wheel drive system compatibility, or chassis durability of the vehicle under test.

[0015] A static test chamber, used for conducting static tests on the vehicle under test;

[0016] An aging chamber, used for high-temperature aging tests on the vehicle under test;

[0017] A noise chamber, used to test the noise and vibration performance of the vehicle under test.

[0018] In one possible implementation, the plurality of environmental chambers include the two-wheel drive chamber, the four-wheel drive chamber, the static chamber, the aging chamber, and the silent chamber; the two-wheel drive chamber, the four-wheel drive chamber, the static chamber, and the aging chamber are arranged side by side in a horizontal direction, the two-wheel drive chamber and the four-wheel drive chamber constitute a first environmental chamber group, and the static chamber and the aging chamber constitute a second environmental chamber group.

[0019] The discharge pipeline includes a first collection channel, a second collection channel, and a third collection channel. The first environmental chamber corresponds to the first collection channel, the second environmental chamber corresponds to the second collection channel, and the silent chamber corresponds to the third collection channel.

[0020] In one possible implementation, the air extraction device includes a centrifugal fan, which is installed on the first collection channel, the second collection channel and the third collection channel, and the silencing chamber is also equipped with a blower.

[0021] In one possible implementation, the connecting pipeline includes a rigid pipeline and a flexible pipeline that are interconnected, the rigid pipeline being connected to the corresponding branch emission channel, and the flexible pipeline being connected to the vehicle's exhaust channel.

[0022] In one possible implementation, the connecting pipes of each of the environmental chambers include multiple pipes, each of which is used to connect to the exhaust gas passages of multiple vehicles under test.

[0023] In one possible implementation, each of the environmental chambers is equipped with a gas sensor for detecting harmful gases in the exhaust gas; the sensor includes at least one of a gasoline sensor, a carbon monoxide sensor, a nitrogen monoxide sensor, and an oxygen sensor.

[0024] The carbon monoxide sensor is located at the top of the environmental chamber, while the gasoline sensor, nitric oxide sensor, and oxygen sensor are located at the bottom of the environmental chamber.

[0025] In one possible implementation, the control valve includes a first valve disposed in at least one of the first collection channel, the second collection channel, and the third collection channel, wherein the first valve is an electric valve or a manual valve.

[0026] In one possible implementation, the control valve further includes a second valve disposed at the connection between the branch discharge channel and the connecting pipeline, wherein the second valve is an electric valve or a manual valve.

[0027] Compared with the prior art, this application has at least the following beneficial effects:

[0028] The vehicle exhaust emission system provided in this application includes multiple environmental chambers, each with a defined space to accommodate the vehicle under test, providing an independent simulated environment for vehicle testing. Each environmental chamber has a connecting pipe serving as the initial channel for exhaust gas outflow, connecting to the exhaust gas passage of the vehicle under test. This allows exhaust gas generated by the vehicle's engine or range extender to be guided from inside the vehicle to the emission system outside the environmental chamber. The emission components include emission pipes and control valves. The main emission channel of the emission pipes serves as the primary path for exhaust gas collection and discharge, and also handles the exhaust gas delivery function of multiple branch channels. These branch emission channels correspond one-to-one with multiple environmental chambers. One end of each branch emission channel connects to the connecting pipe within the corresponding environmental chamber, while the other end connects to the main emission channel, forming a multi-inlet, one-outlet pipe network. The control valves control the on / off state of individual branch emission channels, allowing for flexible switching of the exhaust gas emission status of specific environmental chambers according to testing requirements. The exhaust gas extraction device is integrated into the exhaust pipeline and extracts exhaust gas by generating negative pressure. The extraction device is configured to simultaneously extract exhaust gas from at least one branch exhaust channel. The extracted exhaust gas is then discharged into the main exhaust channel via the branch channel.

[0029] Therefore, this system, through its centralized piping architecture of main emission channels and branch emission channels, can meet the exhaust gas emission requirements of single-chamber single-discharge or simultaneous emission from multiple chambers. The independent control function of the control valves for individual branch emission channels allows the system to flexibly start and stop the exhaust gas emission of corresponding chambers according to the test status of each environmental chamber. For example, when a certain environmental chamber is not being tested, its exhaust gas path can be cut off by closing the corresponding control valve to avoid ineffective ventilation. The simultaneous extraction capability of the extraction device for multiple branch channels can adapt to the scenario requirements of simultaneous testing of multiple environmental chambers. The control mode is more flexible, reducing the redundant configuration of emission pipelines and extraction devices, improving equipment utilization and overall operating efficiency. The centralized main emission channel design makes the exhaust gas emission path simpler and more efficient, reducing pipeline redundancy. The unified emission path facilitates the subsequent integration of exhaust gas purification and treatment devices, which can further improve the environmental friendliness of exhaust gas treatment. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is one of the structural schematic diagrams of a vehicle exhaust emission system provided in the embodiments of this application;

[0032] Figure 2This is one of the structural schematic diagrams of a vehicle exhaust emission system provided in the embodiments of this application;

[0033] Figure 3 This is a schematic diagram of the structure of the environmental compartment of a vehicle exhaust emission system provided in an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the structure of a noise-reducing compartment for a vehicle exhaust emission system provided in an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 10-Environmental Chamber; 11-Two-Wheel Drive Chamber; 12-Four-Wheel Drive Chamber; 13-Static Chamber; 14-Aging Chamber; 15-Silent Chamber; 16-First Environmental Chamber Group; 17-Second Environmental Chamber Group;

[0037] 20 - Emission assembly; 21 - Emission line; 211 - Main emission channel; 212 - Branch emission channel; 22 - Control valve; 221 - First valve; 222 - Second valve; 23 - Collection channel; 231 - First collection channel; 232 - Second collection channel; 233 - Third collection channel;

[0038] 30 - Exhaust device; 31 - Centrifugal fan; 32 - Blower;

[0039] 40 - Connecting pipes; 41 - Rigid pipes; 42 - Flexible pipes;

[0040] 50 - Gas sensor. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0043] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0044] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0045] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0046] In the field of automotive R&D and testing, environmental chambers, as core testing facilities capable of accurately simulating complex environmental conditions such as extreme temperatures, humidity, air pressure, and road conditions, have become essential equipment for verifying the power performance, emission characteristics, and reliability of vehicles such as gasoline-powered cars and range-extended electric vehicles. During vehicle testing within the environmental chamber, the start-up and operation of the engine or range extender continuously generate exhaust gases, which contain toxic and harmful gases such as carbon monoxide and nitrogen oxides, as well as pollutants such as particulate matter.

[0047] If exhaust gases are not effectively discharged from the test chamber in a timely manner, their accumulation inside the chamber will cause the concentration of harmful components to rise continuously. When the concentration exceeds the safety threshold, it will not only directly threaten the life and health of the test personnel, but may also cause chemical reactions or physical interference with the equipment inside the chamber, leading to a decrease in the accuracy of the test instruments, which in turn affects the authenticity and reliability of the test data and adversely affects the automotive research and development process.

[0048] To address exhaust emission issues, some domestic laboratories have installed exhaust emission systems. However, existing technologies still have significant limitations: current mainstream exhaust emission systems generally adopt a single-compartment, single-system architecture, meaning each environmental chamber is equipped with its own independent exhaust gas collection and emission device. This model requires the repeated configuration of core equipment such as fans, ducts, and purification units for each chamber, resulting not only in a large overall system footprint and low equipment utilization, but also a significant increase in initial construction investment and long-term maintenance costs, making it difficult to meet the needs of large-scale, high-efficiency laboratory operations.

[0049] Based on this, this application discloses a vehicle exhaust emission system that can meet the exhaust emission requirements of single-chamber single-row or multi-chamber simultaneous emission through a centralized pipeline architecture of main emission channel and branch emission channel. The control valve has an independent control function for a single branch emission channel, which allows the system to flexibly start and stop the exhaust emission of the corresponding chamber according to the test status of each environmental chamber.

[0050] The technical solution of this application will be described in detail below with reference to specific embodiments and accompanying drawings.

[0051] The present application will be described in detail below through specific embodiments:

[0052] This application provides a vehicle exhaust emission system, such as... Figures 1 to 4 As shown, a vehicle exhaust emission system includes:

[0053] Multiple environmental chambers 10, each environmental chamber 10 is limited to accommodate the vehicle to be tested, and each environmental chamber 10 is provided with a connecting pipe 40 for connecting to the exhaust passage of the vehicle to be tested.

[0054] The emission assembly 20 includes an emission pipeline 21 and a control valve 22. The emission pipeline 21 includes a main emission channel 211 and multiple branch emission channels 212. The multiple branch emission channels 212 are configured one-to-one with multiple environmental chambers 10. The connecting pipeline 40 in each environmental chamber 10 is connected to the corresponding branch emission channel 212, and each branch emission channel 212 is connected to the main emission channel 211. The control valve 22 is used to control the connection status of at least one branch emission channel 212.

[0055] An exhaust device 30 is provided in the discharge pipe 21 and is configured to simultaneously extract exhaust gas from at least one branch discharge channel 212 and discharge the extracted exhaust gas through the main discharge channel 211.

[0056] The vehicle exhaust emission system provided in this application embodiment includes multiple environmental chambers 10. Each environmental chamber 10 defines a space for accommodating the vehicle under test, providing an independent simulated environment for vehicle testing. Each environmental chamber 10 is equipped with a connecting pipe 40, which serves as an initial channel for exhaust gas outflow and is used to connect with the exhaust gas passage of the vehicle under test. This allows exhaust gas generated by the vehicle engine or range extender to be guided from inside the vehicle to the emission system outside the environmental chamber 10.

[0057] The emission assembly 20 includes an emission pipeline 21 and a control valve 22. The main emission channel 211 of the emission pipeline 21 serves as the main path for the collection and discharge of exhaust gas, and undertakes the exhaust gas transportation function of multiple branch channels. Multiple branch emission channels 212 correspond one-to-one with multiple environmental chambers 10. One end of each branch emission channel 212 is connected to the connecting pipeline 40 in the corresponding environmental chamber 10, and the other end is connected to the main emission channel 211, forming a multi-inlet and one-outlet pipeline network. The control valve 22 realizes the on / off control of a single branch emission channel 212, and can flexibly switch the exhaust gas emission state of a specific environmental chamber 10 according to the test requirements. The extraction device 30 is integrated into the emission pipeline 21 and realizes exhaust gas extraction by generating negative pressure. The extraction device 30 is configured to have the ability to extract exhaust gas from at least one branch emission channel 212 at the same time. The extracted exhaust gas is discharged uniformly after flowing into the main emission channel 211 through the branch channels.

[0058] Therefore, firstly, through the centralized pipeline architecture of the main emission channel 211 and the branch emission channel 212, this system can meet the exhaust gas emission requirements of single-chamber single-discharge or multi-chamber simultaneous emission. The independent control function of the control valve 22 on a single branch emission channel 212 enables the system to flexibly start and stop the exhaust gas emission of the corresponding chamber according to the test status of each environmental chamber 10.

[0059] For example, when a certain environmental chamber 10 is not being tested, its exhaust gas passage can be cut off by closing the corresponding control valve 22 to avoid ineffective ventilation. The simultaneous extraction capability of the extraction device 30 to multiple branch channels can adapt to the scenario requirements of simultaneous testing of multiple environmental chambers 10, making the control mode more flexible.

[0060] Moreover, this centralized main emission channel 211 design reduces redundant configurations such as emission pipes 21 and extraction devices 30, improves equipment utilization and overall operating efficiency, makes the exhaust emission path simpler and more efficient, reduces pipeline redundancy, and the unified emission path facilitates the subsequent integration of exhaust gas purification and treatment devices, which can further improve the environmental friendliness of exhaust gas treatment.

[0061] In the diagram, the X direction is the horizontal direction.

[0062] In some embodiments, such as Figure 1 and Figure 3 As shown, at least some of the environmental chambers 10 constitute at least two environmental chamber groups, and each environmental chamber group includes at least two environmental chambers 10, with each environmental chamber 10 in each environmental chamber group being connected to a corresponding branch emission channel 212.

[0063] The emission pipeline 21 also includes at least two collection channels 23, which are connected between the branch emission channels 212 and the main emission channel 211, and the branch emission channels 212 corresponding to each environmental module are connected to the same collection channel 23.

[0064] Multiple environmental chambers 10 are grouped to form at least two environmental chamber groups, each containing at least two environmental chambers 10. The environmental chambers 10 are integrated according to functional requirements, test types, or spatial distribution, for example, they can be grouped according to factors such as the type of test vehicle or the intensity of the test. Each environmental chamber 10 within each environmental chamber group maintains independent communication with its corresponding branch emission channel 212, ensuring that the initial collection path of exhaust gas in a single chamber is not affected.

[0065] The emission pipeline 21 includes at least two collection channels 23 to realize the hierarchical transition between the branch emission channels 212 and the main emission channel 211. Each collection channel 23 is connected to an environmental module, that is, all the branch emission channels 212 of the environmental modules 10 in the same environmental module are connected to the same collection channel 23, and then the collection channel 23 is connected to the main emission channel 211. The pipeline forms a transmission path from the environmental module 10 to the branch emission channel 212, then to the collection channel 23, and finally into the main emission channel 211. The collection channel 23 becomes the intermediate hub for receiving the exhaust gas of a specific environmental module, realizing the secondary collection of exhaust gas before entering the main channel.

[0066] Therefore, for the same environmental chamber group, the common needs within the group can be uniformly managed by adjusting the overall exhaust parameters of the collection channel 23, such as wind speed and pressure. For example, the same exhaust intensity can be set for environmental chamber groups of the same test type, and the individual environmental chamber 10 within the group can be fine-tuned by combining the control valve 22 of the branch exhaust channel 212.

[0067] Meanwhile, the collection channel 23, acting as a buffer between the branch emission channel 212 and the main emission channel 211, can effectively balance the exhaust gas flow and pressure of different environmental chambers. When multiple environmental chambers are operating simultaneously, the collection channel 23 can perform preliminary pressure stabilization and flow regulation of the exhaust gas from each branch within the group, preventing airflow interference between different groups of exhaust gas in the main emission channel 211 and reducing pressure fluctuations.

[0068] Furthermore, by adopting a modular design for the environmental modules and the collection channel 23, the system can flexibly increase or decrease the number of environmental modules and the number of environmental modules 10 within a module according to the expansion needs of the laboratory. Adding a new environmental module 10 only requires connecting it to the corresponding collection channel 23 to integrate it into the system, without requiring large-scale modifications to the main emission channel 211. This significantly improves the system's expansion flexibility and facilitates future maintenance.

[0069] In some embodiments, such as Figure 1 As shown, the multiple environmental chambers 10 include any one or more of the following:

[0070] Two-wheel drive compartment 11 is used to test the power performance, two-wheel drive system compatibility, or chassis durability of the vehicle under test.

[0071] Four-wheel drive compartment 12 is used to test the power performance, four-wheel drive system compatibility, or chassis durability of the vehicle under test.

[0072] Static chamber 13 is used for static testing of the vehicle under test.

[0073] Aging chamber 14 is used for high-temperature aging tests on the vehicle under test.

[0074] The noise chamber 15 is used to test the noise and vibration performance of the vehicle under test.

[0075] Different types of environmental chambers 10 are grouped and integrated according to their test function characteristics and exhaust emission requirements. Two-wheel drive chambers 11 and four-wheel drive chambers 12 are mainly used to test vehicle power performance, drive system matching, and chassis durability. During the test, the engine or range extender operates at high intensity, resulting in large and continuous exhaust emissions; these can be classified as high-emission-intensity chambers. Static chambers 13 focus on vehicle static testing, with exhaust emissions mostly intermittent and small in volume; they can be grouped independently or combined with chambers of similar emission levels. Aging chambers 14 are used for high-temperature aging tests; exhaust gas composition is prone to change under high-temperature environments, and there are special requirements for the heat resistance of the exhaust pipes 21. Silent chambers 15 are used for noise and vibration performance testing; during the test, strict control of the chamber pressure is required to avoid interference with noise test results. Their exhaust emission requirements emphasize precise adjustment; they can be classified as a separate chamber group. After being grouped by functional attributes, the various environmental chambers 10 are connected to their corresponding collection channels 23, ensuring that environmental chambers 10 within the same collection channel 23 have similar exhaust emission characteristics and control requirements.

[0076] In some embodiments, such as Figure 2 As shown, the multiple environmental chambers 10 include a two-wheel drive chamber 11, a four-wheel drive chamber 12, a static chamber 13, an aging chamber 14, and a soundproof chamber 15; the two-wheel drive chamber 11, the four-wheel drive chamber 12, the static chamber 13, and the aging chamber 14 are arranged side by side in the horizontal direction, the two-wheel drive chamber 11 and the four-wheel drive chamber 12 constitute the first environmental chamber group 16, and the static chamber 13 and the aging chamber 14 constitute the second environmental chamber group 17.

[0077] The discharge pipeline 21 includes a first collection channel 231, a second collection channel 232 and a third collection channel 233. The first environmental compartment 16 corresponds to the first collection channel 231, the second environmental compartment 17 corresponds to the second collection channel 232, and the silent compartment 15 corresponds to the third collection channel 233.

[0078] The two-wheel drive compartment 11, four-wheel drive compartment 12, static compartment 13, and aging compartment 14 are arranged horizontally side by side. This compact spatial layout shortens the length of the branch emission channel 212, reduces pipeline resistance, and facilitates centralized management and maintenance. Based on emission characteristics and testing functions, the two-wheel drive compartment 11 and four-wheel drive compartment 12 constitute the first environmental compartment group 16. Both are mainly used for power performance and drive system matching tests. The engines or range extenders operate at high intensity, with large exhaust emissions and frequent changes in operating conditions, exhibiting similar high emission requirements. The static compartment 13 and aging compartment 14 constitute the second environmental compartment group 17. The static compartment 13 has strong intermittent exhaust emissions and small emissions, while the aging compartment 14 has moderate emission intensity but high exhaust temperature. The two share certain commonalities in the precision of emission control. The silent compartment 15, due to its extremely high requirements for noise and vibration control, is not arranged side by side with other compartments. Instead, it is an independent unit with its own dedicated collection channel 23, avoiding interference from vibration or noise from the emission pipelines 21 of other compartments.

[0079] The emission pipeline 21 is divided into a first collection channel 231, a second collection channel 232, and a third collection channel 233 according to the compartment group. The first collection channel 231 connects the two-wheel drive compartment 11 and the four-wheel drive compartment 12 of the first environmental compartment group 16. The second collection channel 232 connects the static compartment 13 and the aging compartment 14 of the second environmental compartment group 17. The third collection channel 233 connects the silent compartment 15. The three collection channels 23 eventually converge to the main emission channel 211, forming a hierarchical emission pipeline network 21. This avoids cross-interference of exhaust gases from different types of compartments in the pipeline. The high-flow exhaust gas in the first collection channel 231 does not need to be mixed with other low-flow or high-temperature exhaust gases, reducing airflow turbulence and energy loss, and improving overall emission efficiency.

[0080] In some embodiments, such as Figure 2 As shown, the air extraction device 30 includes a centrifugal fan 31. Centrifugal fans 31 are installed on the first collection channel 231, the second collection channel 232 and the third collection channel 233. The soundproof chamber 15 is also equipped with a blower 32.

[0081] After each collection channel 23 is independently equipped with a centrifugal fan 31, the fan of the first collection channel 231 can specifically meet the peak emission requirements of the two-wheel drive compartment 11 and the four-wheel drive compartment 12, avoiding exhaust gas accumulation due to insufficient power; the fan of the second collection channel 232 reduces the ventilation interference between the static compartment 13 and the aging compartment 14, the high temperature exhaust gas of the aging compartment 14 can be discharged quickly, and the life of the static compartment 13 will not be affected by the frequent start and stop of the fan when it is intermittently emitting; the fan of the third collection channel 233 ensures the stable exhaust gas extraction of the silent compartment 15. The three work together to improve the extraction efficiency of each compartment group.

[0082] The silent chamber 15 solves the negative pressure problem caused by the exhaust system through the coordinated control of the supply fan 32 and the exhaust fan. The supply fan 32 compensates for the air volume carried away by the exhaust fan in real time, so that the pressure inside the chamber is always maintained within a reasonable range, avoiding the impact of pressure fluctuations on the sensitivity of the noise test microphone.

[0083] Among them, the centrifugal fan 31 can be an adjustable fan with a frequency converter, which can realize the fan capacity from 2000m³ / h. 3 / h-8000m 3 Infinitely adjustable within / h.

[0084] In some embodiments, such as Figure 3 As shown, the connecting pipe 40 includes a rigid pipe 41 and a flexible pipe 42 that are interconnected. The rigid pipe 41 is connected to the corresponding branch emission channel 212, and the flexible pipe 42 is used to connect to the vehicle's exhaust channel.

[0085] The high strength and fixed installation characteristics of the rigid pipe 41 ensure long-term sealing at the connection with the branch exhaust channel 212, avoiding leakage problems at the connection due to vibration or thermal expansion and contraction. The flexibility of the flexible pipe 42 solves the sealing problem between the vehicle and the fixed pipe. During the test, the vehicle exhaust passage may experience slight shaking due to engine vibration or vehicle displacement. The flexible pipe 42 can absorb these displacements through its own deformation, maintaining a tight connection with the exhaust passage and reducing the risk of exhaust leakage.

[0086] In some embodiments, such as Figure 4 As shown, each environmental chamber 10 has multiple connecting pipes 40, which are used to connect to the exhaust gas passages of multiple vehicles to be tested.

[0087] The design of multiple connecting pipes 40 allows a single environmental chamber 10 to simultaneously connect to multiple vehicles under test, or to connect to a single vehicle with multiple exhaust gas channels, increasing the testing flexibility of the environmental chamber 10. It is especially suitable for scenarios that require comparative testing of multiple vehicles of the same type or testing of special models with multiple exhaust gas channels, thereby improving the utilization rate of the environmental chamber 10.

[0088] In some embodiments, such as Figure 1 As shown, each environmental chamber 10 is equipped with a gas sensor 50, which is used to detect harmful gases in the exhaust gas; the sensor includes at least one of a gasoline sensor, a carbon monoxide sensor, a nitrogen monoxide sensor and an oxygen sensor.

[0089] The carbon monoxide sensor is located at the top of the environmental chamber 10, while the gasoline sensor, nitric oxide sensor, and oxygen sensor are located at the bottom of the environmental chamber 10.

[0090] Each environmental chamber 10 is equipped with gas sensors 50 covering the detection needs of typical harmful gases and characteristic components in exhaust gas. The gasoline sensor is mainly used to detect the concentration of unburned gasoline volatiles in the exhaust gas, providing a basis for judging combustion efficiency and safety risks; the carbon monoxide sensor focuses on monitoring the content of the highly toxic gas carbon monoxide, directly related to the life safety of test personnel; the nitric oxide sensor targets nitrogen oxide pollutants in the exhaust gas, helping to assess emission compliance; and the oxygen sensor indirectly reflects the impact of harmful gases on the air quality inside the chamber by detecting changes in oxygen content, while also assisting in judging combustion completeness.

[0091] Gas sensors 50 are installed in different positions according to gas density characteristics and detection requirements. The carbon monoxide sensor is located at the top of the environmental chamber 10. Since carbon monoxide is slightly less dense than air, it tends to accumulate in the upper part of the chamber. Top installation can detect its concentration changes earlier. The gasoline sensor, nitric oxide sensor, and oxygen sensor are located at the bottom of the environmental chamber 10. The gasoline volatiles and nitric oxide are slightly more dense than air, and their concentration is higher at the bottom. Bottom installation can improve detection sensitivity. The oxygen sensor at the bottom can more accurately reflect the oxygen content in the breathing zone around the vehicle.

[0092] In some embodiments, such as Figure 2 As shown, the control valve 22 includes a first valve 221 disposed in at least one of the first collection channel 231, the second collection channel 232 and the third collection channel 233, wherein the first valve 221 is an electric valve or a manual valve.

[0093] The first valve 221, along with the centrifugal fan 31 and gas sensor 50 in the collection channel 23, forms a multi-level control linkage. When an electric valve is used, the first collection channel 231 can dynamically change according to the test conditions of the two-wheel drive compartment 11 and the four-wheel drive compartment 12. It can quickly open wide during high emission phases such as rapid vehicle acceleration and appropriately close during idling, so that the extraction capacity is perfectly matched with the exhaust gas emission volume, reducing disturbance to the pressure inside the compartment. The manual valve provides a reliable backup control method for special scenarios. In the event of a power outage or electric control failure, basic emissions can be maintained through manual adjustment, ensuring that the test is not interrupted.

[0094] Furthermore, such as Figure 1 As shown, the control valve 22 also includes a second valve 222 disposed at the connection between the branch discharge channel 212 and the connecting pipeline 40, wherein the second valve 222 is an electric valve or a manual valve.

[0095] The second valve 222 allows the extraction capacity of each branch emission channel 212 to be adjusted independently. When multiple vehicles or multiple exhaust channels are tested simultaneously, the opening of the corresponding second valve 222 can be adjusted individually according to the actual exhaust emission of each connecting pipe 40 to ensure that the high emission branch is fully extracted and the low emission branch is not over-extracted, thus avoiding insufficient extraction in some areas or energy waste.

[0096] For example, when testing a vehicle with dual exhaust pipes, the second valves 222 of the two branches can be adjusted according to the actual emission volume of the left and right exhaust pipes to make the exhaust gas emission more balanced and efficient.

[0097] Manual valves often employ structures such as butterfly valves or ball valves, which are not limited to this application.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A vehicle exhaust emission system, characterized in that, include: Multiple environmental chambers, each of which defines a space for accommodating a vehicle under test, and each environmental chamber is provided with a connecting pipe for communicating with the exhaust gas passage of the vehicle under test; The emission assembly includes an emission pipeline and a control valve. The emission pipeline includes a main emission channel and multiple branch emission channels. The multiple branch emission channels are configured one-to-one with multiple environmental chambers. The connecting pipelines in each environmental chamber are connected to the corresponding branch emission channel, and each branch emission channel is connected to the main emission channel. The control valve is used to control the connection status of at least one branch emission channel. An exhaust device is provided in the discharge pipeline and is configured to simultaneously extract exhaust gas from at least one of the branch discharge channels and discharge the extracted exhaust gas through the main discharge channel.

2. The vehicle exhaust emission system according to claim 1, characterized in that, At least some of the environmental chambers in the plurality of environmental chambers constitute at least two environmental chamber groups, and each environmental chamber group includes at least two environmental chambers, and each environmental chamber in each environmental chamber group is respectively connected to the corresponding branch emission channel; The discharge pipeline also includes at least two collection channels, which are connected between the branch discharge channels and the main discharge channel, and the branch discharge channels corresponding to each environmental module are all connected to the same collection channel.

3. The vehicle exhaust emission system according to claim 2, characterized in that, The plurality of said environmental chambers include any one or more of the following: Two-wheel drive compartment, which is used to test the power performance, two-wheel drive system compatibility or chassis durability of the vehicle under test; The four-wheel drive cabin is used to test the power performance, four-wheel drive system compatibility, or chassis durability of the vehicle under test. A static test chamber, used for conducting static tests on the vehicle under test; An aging chamber, used for high-temperature aging tests on the vehicle under test; A noise chamber, used to test the noise and vibration performance of the vehicle under test.

4. The vehicle exhaust emission system according to claim 3, characterized in that, The multiple environmental chambers include the two-wheel drive chamber, the four-wheel drive chamber, the static chamber, the aging chamber, and the silent chamber; the two-wheel drive chamber, the four-wheel drive chamber, the static chamber, and the aging chamber are arranged side by side in a horizontal direction, the two-wheel drive chamber and the four-wheel drive chamber constitute a first environmental chamber group, and the static chamber and the aging chamber constitute a second environmental chamber group. The discharge pipeline includes a first collection channel, a second collection channel, and a third collection channel. The first environmental chamber corresponds to the first collection channel, the second environmental chamber corresponds to the second collection channel, and the silent chamber corresponds to the third collection channel.

5. The vehicle exhaust emission system according to claim 4, characterized in that, The air extraction device includes a centrifugal fan, and the centrifugal fan is installed on the first collection channel, the second collection channel and the third collection channel. The silent chamber is also equipped with a blower.

6. The vehicle exhaust emission system according to any one of claims 1-5, characterized in that, The connecting pipeline includes a rigid pipeline and a flexible pipeline that are interconnected. The rigid pipeline is connected to the corresponding branch emission channel, and the flexible pipeline is used to connect to the vehicle's exhaust channel.

7. The vehicle exhaust emission system according to claim 6, characterized in that, Each of the environmental chambers has multiple connecting pipes, and each of the multiple connecting pipes is used to connect to the exhaust gas passages of multiple vehicles under test.

8. The vehicle exhaust emission system according to any one of claims 1-5, characterized in that, Each of the environmental chambers is equipped with a gas sensor for detecting harmful gases in the exhaust gas; the sensor includes at least one of a gasoline sensor, a carbon monoxide sensor, a nitric oxide sensor, and an oxygen sensor. The carbon monoxide sensor is located at the top of the environmental chamber, while the gasoline sensor, nitric oxide sensor, and oxygen sensor are located at the bottom of the environmental chamber.

9. The vehicle exhaust emission system according to claim 4, characterized in that, The control valve includes a first valve disposed in at least one of the first collection channel, the second collection channel, and the third collection channel, wherein the first valve is an electric valve or a manual valve.

10. The vehicle exhaust emission system according to any one of claims 1-5, characterized in that, The control valve further includes a second valve located at the connection between the branch discharge channel and the connecting pipeline, wherein the second valve is an electric valve or a manual valve.

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