Diesel vehicle DPF failure rapid diagnosis system based on high idle speed detection method

Abstract

The utility model relates to a diesel vehicle DPF failure rapid diagnosis system based on a high idle speed detection method. The system comprises a rapid installation clamp, a sampling pipe, a condensate water remover, a particulate matter number concentration measurement module and a controller, the quick mounting clamp is used for connecting the vehicle exhaust pipe and the sampling pipe; one end of the sampling pipe is connected with the rapid installation clamp, the other end of the sampling pipe is connected with an inlet of the condensate water remover, an outlet of the condensate water remover is connected with a sampling port of the particulate matter number concentration measuring module, and the output end of the particulate matter number concentration measuring module is connected with the input end of the controller. According to the diesel vehicle DPF failure rapid diagnosis system based on the high idle speed detection method, the design is closer to the actual operation condition of the vehicle, simulation in a laboratory or an on-site environment is easy, the consistency and repeatability of detection standards can be ensured, and therefore the problems in the prior art are effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of environmental monitoring technology, specifically to a rapid diagnostic system for diesel vehicle DPF failure based on a high idle speed detection method. Background Technology

[0002] With the gradual implementation of the China VI emission standards for light and heavy-duty vehicles, the China IV emission standards for non-road mobile machinery, and emission standards for in-use gasoline and diesel vehicles, particulate matter number emissions (PN) from mobile sources have become a key focus of regulatory oversight and enterprise product development.

[0003] A diesel particulate filter (DPF) is a ceramic filter installed in an engine's exhaust system. Installing a DPF effectively reduces particulate matter emissions from vehicle exhaust, mitigating air pollution. However, as the number of particles captured increases, fuel consumption rises, and particle capture efficiency decreases. While DPFs can be regenerated through heating to improve efficiency, this process can lead to burnt-out damage to the filter housing. Furthermore, vehicle vibrations during driving can also damage the housing, and incomplete or failed regeneration can cause DPF clogging. Therefore, DPF failure diagnosis is necessary.

[0004] Chinese patent document CN 111287826 B discloses a device and method for reminding a particulate filter (DPF) to perform maintenance, as well as the DPF itself. This document proposes using differential pressure sensors installed across the DPF to determine the degree of failure based on changes in the pressure difference. However, this method is susceptible to the influence of the differential pressure sensor itself and is an indirect measurement scheme, failing to accurately reflect the true concentration of particulate matter emitted by the vehicle. Chinese patent document CN 106762061 B proposes a diagnostic device and method for simulating DPF failure. This document uses two leakage current-type particulate matter sensors installed on an engine bench. Two flow control valves are used to measure the difference in particulate matter concentration between the original engine exhaust and the particulate matter concentration after passing through the DPF to determine the DPF failure state. However, the leakage current-type particulate matter sensors used in this document have relatively high measurement noise, making them unsuitable for precise measurements. Furthermore, they are difficult to use for testing actual vehicle emission levels and are inconvenient to operate.

[0005] Therefore, how to provide a rapid diagnostic system for diesel vehicle DPF failure, which can determine whether the diesel vehicle DPF has failed by measuring the particulate matter number concentration information in diesel vehicle exhaust emissions, has become an urgent problem to be solved. Utility Model Content

[0006] Addressing the challenges currently faced in the diesel vehicle technology field—namely, low detection accuracy due to low and fluctuating exhaust gas flow during idling (when the vehicle is in a non-operating state) and mid-speed load conditions (while closely resembling actual vehicle operation)—this invention proposes an innovative solution: a rapid diagnostic system for diesel vehicle DPF failure based on a high-idle speed detection method. This system is designed to more closely approximate actual vehicle operating conditions, facilitating simulation in laboratory or field environments and ensuring the consistency and repeatability of detection standards, thus effectively overcoming the difficulties in existing technologies.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A rapid diagnostic system for diesel vehicle DPF failure based on a high idle speed detection method is disclosed. The system includes a quick-installation fixture, a sampling tube, a condensate remover, and a particulate matter number concentration measurement module. The quick-installation fixture is used to connect the vehicle's exhaust pipe to the sampling tube. One end of the sampling tube is connected to the quick-installation fixture, and the other end of the sampling tube is connected to the inlet of the condensate remover. The outlet of the condensate remover is connected to the sampling port of the particulate matter number concentration measurement module.

[0009] Furthermore, the quick-installation clamp includes a fixed handle and a locking handle; the fixed handle and the locking handle are connected by a rotating shaft, and a torsion spring is installed on the rotating shaft. The middle part of the torsion spring is wound around the rotating shaft, and both ends extend outward at a certain angle and are located between the fixed handle and the locking handle; the end of the fixed handle is provided with a probe fixing tube, and a probe fixing component is installed through the probe fixing tube; the end of the locking handle is provided with a clamp locking buckle. The probe fixing tube is welded to the top of the fixed handle. The probe fixing tube is a round tube with a through hole for installing the probe fixing component; the probe fixing component is a screw; the sampling tube probe extends into the probe fixing tube, and the probe fixing component fixes the sampling probe of the sampling tube in the probe fixing tube. The clamp locking buckle is welded to the top of the locking handle, and the clamp locking buckle includes a connecting part connected to the locking handle and a locking part disposed above one end of the connecting part; the connection between the connecting part and the locking handle is arc-shaped. Both the fixed handle and the locking handle have limiting edges at their outer ends, which are used to limit the torsion spring. The locking handle and the fixed handle are provided with anti-slip protective parts. The quick-installation clamp has a rotating shaft in the middle of the clamp's fixed handle to mount the locking handle, and a torsion spring is located between the two handles. A probe fixing tube component is welded to the top of the handle, and a probe fixing screw is located on the right side of the tube for fixing the sampling probe. In use, under the action of the spring force, the locking buckle and the probe fixing tube will clamp tightly against the exhaust pipe wall.

[0010] According to a preferred embodiment of this invention, the sampling tube is a CEMS heat tracing tube, which achieves high-temperature heat tracing with a maximum heating temperature ≥100℃ and a length ≥2m. A sampling probe is provided at one end of the sampling tube, and the sampling probe is threadedly connected to the sampling tube. The sampling tube is a corrugated flexible tube, which is flexible and shape-adjustable.

[0011] According to a preferred embodiment of this invention, the condensate remover is provided with a compression fitting at both its inlet and outlet. The condensate remover includes a remover housing, an exhaust gas passage disposed inside the remover housing, and a water-absorbing material filled between the remover housing and the exhaust gas passage; the remover housing and the exhaust gas passage are coaxially arranged. The exhaust gas passage is made of a steel mesh circular tube. The water-absorbing material is a reusable absorbent.

[0012] According to a preferred embodiment of this invention, the particulate number concentration measurement module is a benchtop / portable detector for particulate matter emitted from mobile sources, based on the condensation nucleus particle counting (CPC) method or the diffusion charging (DC) method. The particulate number concentration measurement module employs existing particulate number concentration measurement devices, measuring particulate number concentration based on the condensation growth counting principle or the diffusion charging principle. The measurement range of this particulate number concentration measurement module meets the requirements of 3000~1E7# / cm3, measurement resolution ≤1000# / cm3, particle size measurement lower limit of 23nm; time resolution ≤1s, and internal wireless transmission function for communication with a host computer.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] (1) Existing DPF failure diagnosis technologies have several limitations. For example, some methods are susceptible to the error of the differential pressure sensor itself, and the use of indirect measurement means makes it difficult to accurately reflect the true concentration of particulate matter emitted by motor vehicles, as shown in Chinese patent document CN 111287826 B. Other technologies, such as leakage current type particulate matter sensors, are not suitable for high-precision measurement requirements due to large measurement noise, as shown in Chinese patent document CN 106762061 B. This utility model has the characteristics of stable performance and accurate measurement. By using a sampling tube equipped with a heating function, it ensures that the collected exhaust gas is kept at a high temperature, effectively preventing particulate matter from condensing and increasing due to cooling, thereby avoiding deviations in measurement results. At the same time, the condensate remover can significantly reduce the humidity of the exhaust gas, which not only protects the back-end measurement module from damage by high humidity exhaust gas, but also eliminates measurement errors caused by droplets being misjudged as particulate matter. These measures strictly control the state of the exhaust gas entering the measurement module, so that the emission data of the vehicle under test can be more accurately reflected, while also providing better protection for the measurement module, extending the overall life of the system, and shortening the maintenance cycle. Ultimately, by combining the unique measurement process and data processing algorithm of this invention, the accuracy of the data and the reliability of the measurement results have been further improved.

[0015] (2) In terms of installation and operation, this utility model also performs excellently. With the help of the quick-installation fixture, the sampling system can be quickly connected to the vehicle under test, eliminating the need for cumbersome additional fixing steps. When it is necessary to change the test vehicle, only the quick-installation fixture needs to be easily disassembled and reassembled, which can minimize non-testing time. In addition, the integrated automatic vehicle license plate recognition system can quickly and accurately lock the vehicle with DPF (diesel particulate filter) failure without additional manual operation, thereby significantly improving the efficiency of the testing operation.

[0016] (3) The application scope of this utility model is extremely wide and its compatibility is strong. For different users, the rapid diagnostic system in this utility model can be flexibly constructed based on their existing mobile source emission particulate matter PN detection instruments (whether benchtop or portable) based on the condensation nucleus particle counting (CPC) method or the diffusion charge (DC) method. This design breaks the limitation of specific equipment models, lowers the hardware threshold for users, and demonstrates stronger compatibility. As for the system of this utility model, with its excellent portability and stability, it can adapt to both rigorous indoor testing environments such as engine benches and vehicle rotating hubs, and complex and ever-changing application scenarios such as outdoor roadsides, fully demonstrating its wide applicability and strong environmental adaptability.

[0017] (4) This utility model not only overcomes the limitations of existing DPF failure diagnosis technology, but also achieves significant improvements in performance stability, measurement accuracy, ease of operation, and wide range of applications. Its innovative design concept and advanced technical means have brought about a revolutionary change in the field of motor vehicle particulate matter emission detection, not only improving detection efficiency and accuracy, but also reducing operational difficulty and maintenance costs, providing strong technical support for environmental protection and traffic management. Therefore, this utility model has extremely high practical value and social significance, and is expected to play an important role in the field of motor vehicle emission detection, promoting the continuous progress and development of related technologies. Attached Figure Description

[0018] Figure 1 This is an installation diagram of the diesel vehicle DPF failure rapid diagnosis system based on the high idle speed detection method in this utility model;

[0019] Figure 2 yes Figure 1 A magnified view of part A in the middle;

[0020] Figure 3 This is a timing diagram of the diesel vehicle DPF failure rapid diagnosis system based on the high idle speed detection method during operation;

[0021] Figure 4 The graph shows the original data obtained by the particulate number concentration measurement module when the DPF of the four vehicles failed, as diagnosed by the system described in this utility model; where the horizontal axis represents the measurement time in seconds and the vertical axis represents the particulate number concentration in particles / cm³.

[0022] Figure 5 The graph shows the original data obtained by the particulate matter number concentration measurement module when the DPF of the four vehicles was not in failure, as diagnosed by the system described in this utility model. The horizontal axis represents the measurement time (seconds), and the vertical axis represents the particulate matter number concentration, with the unit being particles / cm³.

[0023] in:

[0024] 1. Test vehicle; 2. Quick-install fixture; 3. Sampling tube; 4. Condensate remover; 5. Particulate matter number concentration measurement module; 6. Host computer; 7. License plate recognition module; 1.1 Exhaust pipe; 2.1 Fixture locking buckle; 2.2 Locking handle; 2.3 Fixing handle; 2.4 Torsion spring; 2.5 Rotating shaft; 2.6 Probe fixing component; 2.7 Probe fixing tube; 3.1 Sampling tube probe. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] like Figure 1 The diagram illustrates a rapid diagnostic system for diesel vehicle DPF failure based on a high idle speed detection method. The system includes a quick-installation fixture 2, a sampling tube 3, a condensate remover 4, a particulate matter number concentration measurement module 5, and a controller 6. The quick-installation fixture 2 connects the vehicle's exhaust pipe 1.1 to the sampling tube 3. One end of the sampling tube 3 is connected to the quick-installation fixture 2, and the other end is connected to the inlet of the condensate remover 4. The outlet of the condensate remover 4 is connected to the sampling port of the particulate matter number concentration measurement module 5, and the output of the particulate matter number concentration measurement module 5 is connected to the input of the controller 6.

[0027] This invention describes a system for quickly diagnosing the failure of a diesel particulate filter (DPF) in a diesel vehicle based on a high-idle speed detection method. The system is designed to efficiently and accurately determine the DPF's operating status, thereby ensuring vehicle emissions meet environmental standards. The quick-installation clamp is a device used to quickly and securely connect the system's sampling tube to the diesel vehicle's exhaust pipe. It needs to adapt to exhaust pipes of different sizes and shapes and ensure good sealing to prevent gas leakage. The sampling tube is used to collect exhaust gas samples from the engine. The sampling tube is typically made of high-temperature resistant materials to withstand the high temperatures that may be present in the exhaust gas. Since exhaust gas contains moisture, condensation easily forms inside the pipe after long-distance transmission. The condensate remover removes this moisture to prevent it from affecting subsequent analysis or damaging the equipment. The particulate number concentration measurement module analyzes the collected exhaust gas samples to determine the number concentration of particulate matter. The controller receives data from the particulate number concentration measurement module, processes this information according to a preset algorithm, and finally provides a conclusion regarding the DPF's operating status.

[0028] like Figure 2As shown, the quick-installation clamp 2 includes a fixed handle 2.3 and a locking handle 2.2; the fixed handle 2.3 and the locking handle 2.2 are connected by a rotating shaft 2.5, and a torsion spring 2.4 is installed on the rotating shaft 2.5. The middle part of the torsion spring 2.4 is wound around the rotating shaft 2.5, and both ends extend outward at a certain angle and are located between the fixed handle 2.3 and the locking handle 2.2; a probe fixing tube 2.7 is provided at the end of the fixed handle 2.3, and a probe fixing component 2.6 is installed through the probe fixing tube 2.7; a clamp locking buckle 2.1 is provided at the end of the locking handle 2.2. The probe fixing tube 2.7 is welded to the top of the fixed handle 2.3. The probe fixing tube 2.7 is a round tube with a through hole for mounting the probe fixing component 2.6. The probe fixing component 2.6 is a screw. The sampling tube probe 3.1 extends into the probe fixing tube 2.7, and the probe fixing component 2.6 fixes the sampling tube probe 3.1. The clamp locking buckle 2.1 is welded to the top of the locking handle 2.2. The clamp locking buckle 2.1 includes a connecting part connected to the locking handle 2.2 and a locking part located above one end of the connecting part. The connection between the connecting part and the locking handle 2.2 is arc-shaped. The outer ends of both the fixing handle 2.3 and the locking handle 2.2 are provided with limiting edges, which are used to limit the torsion spring 2.4. The locking handle 2.2 and the fixing handle 2.3 are provided with anti-slip protection parts. The quick-installation clamp 2 has a rotating shaft 2.5 in the middle of the clamp fixing handle 2.3 for mounting and locking handle 2.2, and a torsion spring 2.4 between the two handles. A probe fixing tube 2.7 is welded to the top of the handle, and a probe fixing screw is provided on the right side of the tube for fixing the sampling probe 3.1. In use, under the elastic force of the torsion spring 2.4, the clamp locking buckle 2.1 and the probe fixing tube 2.7 will clamp the exhaust pipe wall.

[0029] Specifically, the quick-installation clamp 2 utilizes a mechanical structure to quickly connect and secure the exhaust pipe of the test vehicle 1, while ensuring the safety and stability of the sampling probe. The fixing handle 2.3 and the locking handle 2.2 are connected by a rotating shaft 2.5, forming a clamp-like structure. Users can control the size of the clamp opening by operating these two handles, thus accommodating exhaust pipes of different diameters. A torsion spring 2.4 located between the two handles provides a closing force, allowing the clamp to automatically remain closed without external force, ensuring tight contact with the exhaust pipe. This design not only simplifies the installation process but also increases ease of use. The probe fixing tube 2.7, welded to the upper end of the fixing handle, is used to insert and secure the sampling probe 3.1. Through holes on it allow for the use of screws (i.e., probe fixing parts) to firmly lock the probe, preventing loosening due to vibration or other reasons. The clamp locking buckle 2.1 is designed with an arc-shaped connecting part and a protruding locking part at the top. This shape helps improve stability during clamping and reduces the risk of damage to the surface of the clamped object. The limiting edges located at both ends of the handle effectively restrict the position of the torsion spring, preventing it from shifting or falling off during operation. Considering potential issues such as wet hands in practical applications, adding anti-slip materials or textures to the handle surface can significantly improve grip comfort and safety.

[0030] According to a preferred embodiment of this utility model, the sampling tube 3 is a CEMS heat tracing tube, which is used for high-temperature heat tracing. The maximum heating temperature of the high-temperature heat tracing is ≥100℃, and the length is ≥2m. One end of the sampling tube 3 is provided with a sampling probe 3.1, which is connected to the sampling tube 3 by a thread. The sampling tube 3 is a corrugated flexible tube that can be bent and shaped.

[0031] Specifically, sampling tube 3 has heating capabilities, maintaining an internal temperature of at least 100°C to prevent moisture in the exhaust gas from condensing into liquid, thus avoiding pipe blockage or affecting measurement results due to water vapor condensation. Furthermore, heating helps maintain the chemical properties of the sample, especially for components that may react or precipitate at lower temperatures. The longer sampling tube design (length ≥ 2m) provides greater flexibility, allowing for easy connection to vehicle exhaust pipes and testing equipment even in space-constrained environments. The threaded interface facilitates quick probe replacement or cleaning, while also enhancing sealing and reducing the possibility of leakage. This design also allows for the selection of different probe types to meet various needs. The use of a corrugated hose not only increases the sampling tube's flexibility, making it easier to adapt to complex installation environments (such as navigating obstacles), but also improves durability; the corrugated structure helps absorb vibration and shock, reducing the risk of damage from external factors. The sampling tube described in this embodiment is ideal for emissions testing under mobile, field operating conditions. It combines efficient heating, good sealing performance, and excellent mechanical strength to ensure reliable data support throughout the testing process.

[0032] According to a preferred embodiment of this invention, the condensate remover 4 is provided with a compression fitting at both its inlet and outlet. The condensate remover 4 includes a remover housing, an exhaust gas passage disposed inside the remover housing, and a water-absorbing material filled between the remover housing and the exhaust gas passage; the remover housing and the exhaust gas passage are coaxially arranged. The exhaust gas passage is made of a steel mesh circular tube. The water-absorbing material is a reusable absorbent.

[0033] Specifically, the condensate remover 4 is used to remove moisture from the collected exhaust gas sample to ensure accurate analysis by the subsequent particulate matter number concentration measurement module. Compression fittings are installed at the inlet and outlet of the condensate remover 4. This design allows for convenient and quick connection of the sampling tube to the remover while ensuring good sealing. Compression fittings are generally easy to install and remove, and also facilitate maintenance. The remover housing houses the absorbent material and the internal exhaust gas passage. The housing design must consider factors such as pressure resistance, high temperature resistance, and leakage prevention. The exhaust gas passage is located inside the remover housing and is made of steel mesh tubing. This design not only provides sufficient strength to withstand gas pressure, but its mesh structure also helps to increase the contact area between the absorbent material and the exhaust gas, thereby enhancing the dehumidification effect. The absorbent material fills the space between the remover housing and the exhaust gas passage, responsible for absorbing moisture from the passing exhaust gas. Reusable absorbent reduces replacement frequency and lowers operating costs. Commonly used regenerable absorbent materials include silica gel and molecular sieves. The exhaust gas passage is arranged coaxially with the absorber housing, which helps to maintain a smooth airflow, reduce resistance loss, and also facilitates the even distribution of the absorbent material, ensuring the effective operation of the entire device.

[0034] According to a preferred embodiment of this invention, the particulate number concentration measurement module 5 employs a prior art particulate number concentration measurement device, measuring particulate number concentration based on the principle of condensation growth counting or the principle of diffusion charging. The measurement range of this particulate number concentration measurement module 5 meets the requirements of 3000~1E7# / cm3, measurement resolution ≤1000# / cm3, and a lower limit for particle size measurement of 23nm; the time resolution is ≤1s, and it has an internal wireless transmission function for communication with a host computer.

[0035] According to a preferred embodiment of this utility model, the controller includes a host computer 6 and a license plate recognition module 7. The license plate recognition module 7 is used to collect vehicle license plate information at the test points and has a wireless transmission function to upload the recognized license plate information to the host computer. The host computer 6 is used to collect and store data in real time, calculate the particulate matter number concentration characteristics of the vehicle under test, and determine whether the DPF of the vehicle under test is effective based on a set threshold. The functions of the controller are not within the scope of protection of this utility model, and the license plate recognition function and the calculation of the particulate matter number concentration characteristics of the vehicle under test, as well as the determination of the effectiveness of the DPF of the vehicle under test based on a set threshold, can be implemented using existing technologies.

[0036] The diagnostic method of the diesel vehicle DPF failure rapid diagnostic system based on the high idle speed detection method includes the following steps:

[0037] S1. Equipment preheating stage: First, perform a preheating operation on the particulate matter number concentration measurement module 5 until it reaches a ready state to start measurement.

[0038] S2. Sampling System Assembly Process: Using the probe fixing component 2.6 included in the quick-installation clamp 2, the sampling probe 3.1 of the sampling tube 3 is securely placed inside the probe fixing tube 2.7. During this process, the clamp lock 2.1 and the outer wall of the probe fixing tube 2.7 are tightly clamped to the exhaust pipe 1.1 under the elastic action of the torsion spring 2.4, ensuring the stability of the connection.

[0039] S3. Test Startup and Execution:

[0040] S31. Start the vehicle to be tested 1 and first maintain it in an idling state for a duration of T1, preferably T1 is 30s, to ensure that the vehicle is fully warmed up.

[0041] S32. Then, switch the vehicle under test 1 to neutral, press the accelerator to bring it into high idle speed condition, and maintain this state for T2 duration. The preferred T2 is 10s to ensure that the vehicle reaches a stable high idle speed state.

[0042] S33. Release the accelerator and keep the vehicle at idle speed again. The optimal duration for T3 is 10 seconds to ensure that the vehicle returns to a stable idle speed.

[0043] S34. Repeat steps S32 and S33 for a total of five cycles, then terminate the measurement process.

[0044] S4. Sampling Operation: After the test is started, the exhaust gas emitted by the vehicle under test 1 is captured by the sampling probe 3.1 and guided to the sampling tube 3 when it is discharged from the exhaust pipe 1.1. Subsequently, the exhaust gas enters the condensate remover 4 through the sampling tube, where the condensate is effectively adsorbed by the desiccant, thereby reducing the humidity of the sampled exhaust gas. The dried exhaust gas continues to flow to the particulate matter number concentration measurement module 5. After the module completes the measurement of particulate matter number concentration, it uploads the result to the host computer 6.

[0045] Steps S1-S4 are the main objective of the diagnostic system described in this invention. After obtaining the particulate number concentration, existing technologies can be used to determine whether the DPF (Diesel Particulate Filter) of the vehicle under test is malfunctioning. For example, data from time period T2 can be selected as valid data samples from the test results, and the average value of the five sampling periods can be calculated. After removing the maximum and minimum values, the average value of the remaining data is calculated again, which is used as the final result of the particulate number concentration emission of the vehicle under test 1. Based on the final result of the particulate number concentration emission of the vehicle under test 1, it is determined whether it exceeds the preset emission threshold. This determination process can be implemented using existing technologies. If the result exceeds the threshold, the license plate information identified by the license plate recognition module 7 can be used. The license plate information can be identified using existing technologies to accurately locate the vehicle with a malfunctioning DPF (Diesel Particulate Filter) for subsequent processing.

[0046] To date, this invention has been successfully applied in multiple real-world scenarios, covering indoor rotary testing laboratories and outdoor road enforcement. In actual deployments, the device has consistently demonstrated superior performance, fully meeting various application requirements and successfully enabling the monitoring of vehicles with DPF failures (see relevant original measurement data). Figure 4 Vehicles with DPF not failed (see relevant raw measurement data) Figure 5 This invention provides precise differentiation between vehicles with and without DPF malfunctions. To date, it has achieved significant results in multiple practical scenarios, not only enabling long-term stable operation in indoor rotating chassis laboratories and effectively assisting laboratory personnel in completing relevant testing tasks for new vehicle production lines, but also successfully helping transportation management departments quickly locate and identify vehicles with DPF malfunctions in outdoor road enforcement. In actual deployment applications, this device, with its superior performance, fully meets various application requirements and accurately distinguishes between vehicles with DPF malfunctions and those without.

[0047] For example, Figure 4The figures show four sets of raw data curves recorded by the particulate number concentration measurement module when the DPF (Device Filter) of a vehicle was diagnosed as malfunctioning by the system of this invention. In the figures, the horizontal axis represents measurement time in seconds; the vertical axis represents particulate number concentration in particles / cm³. It can be clearly seen from the figures that when the DPF failed, the measured peak particulate number concentration all exceeded 1E+6 particles / cm³. Similarly, Figure 5 This presents four sets of raw data curves recorded by the particulate number concentration measurement module when the vehicle's DPF (Device Power Filter) was functioning as diagnosed by the system of this invention. Similarly, the horizontal axis represents measurement time (seconds), and the vertical axis represents particulate number concentration (particles / cm³). In this case, when the DPF was functioning, the measured peak particulate number concentration was all below 1E+5 particles / cm³. Combined with... Figure 4 and Figure 5 The comparative analysis fully demonstrates that this utility model has the ability to quickly and accurately identify vehicles with DPF failure.

[0048] In summary, this invention solves the existing problems in diesel vehicle testing, particularly the issues of low and unstable exhaust gas flow at idle speed and difficulty in simulating intermediate speed load conditions. The diesel vehicle DPF failure rapid diagnosis system and method based on high idle speed testing proposed in this invention are designed to better reflect the actual operating conditions of vehicles. They are not only easy to simulate in laboratory or field environments, but also ensure the consistency and repeatability of testing standards, thereby effectively overcoming the difficulties in the existing technology.

[0049] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A diesel vehicle DPF failure rapid diagnosis system based on high idle speed detection method, characterized in that, The system comprises a quick mounting clamp (2), a sampling pipe (3), a condensed water remover (4) and a particulate matter number concentration measuring module (5); the quick mounting clamp (2) is used for connecting a vehicle exhaust pipe and the sampling pipe (3); one end of the sampling pipe (3) is connected with the quick mounting clamp (2), and the other end of the sampling pipe (3) is connected with an inlet of the condensed water remover (4); an outlet of the condensed water remover (4) is connected with a sampling port of the particulate matter number concentration measuring module (5); The quick mounting clamp (2) comprises a fixed handle (2.3) and a locking handle (2.2); the fixed handle (2.3) and the locking handle (2.2) are connected through a rotating shaft (2.5), and a torsion spring (2.4) is installed on the rotating shaft (2.5); the middle part of the torsion spring (2.4) is wound on the rotating shaft (2.5), and the two ends of the torsion spring (2.4) are outwardly extended at a certain angle and located between the fixed handle (2.3) and the locking handle (2.2); the end of the fixed handle (2.3) is provided with a probe fixing pipe (2.7), and a probe fixing piece (2.6) is installed through the probe fixing pipe (2.7); the end of the locking handle (2.2) is provided with a clamp locking buckle (2.1).

2. The diesel vehicle DPF failure quick diagnosis system based on high idle speed detection method according to claim 1, characterized in that The probe fixing pipe (2.7) is welded at the top end of the fixed handle (2.3); The probe fixing pipe (2.7) is a circular pipe, and a through hole is formed in the probe fixing pipe (2.7) for installing the probe fixing piece (2.6); the probe fixing piece (2.6) is a screw; The sampling probe of the sampling pipe is inserted into the probe fixing pipe (2.7), and the probe fixing piece (2.6) fixes the sampling probe of the sampling pipe in the probe fixing pipe (2.7).

3. The diesel vehicle DPF failure quick diagnosis system based on high idle speed detection method according to claim 1, characterized in that The clamp locking buckle (2.1) is welded at the top end of the locking handle (2.2), and the clamp locking buckle (2.1) comprises a connecting part connected with the locking handle (2.2) and a locking part arranged above one end of the connecting part; the connecting part and the locking handle (2.2) are connected in a circular arc shape.

4. The diesel vehicle DPF failure quick diagnosis system based on high idle speed detection method according to claim 1, characterized in that The outer ends of the fixed handle (2.3) and the locking handle (2.2) are both provided with limiting edges for limiting the torsion spring (2.4).

5. The diesel vehicle DPF failure quick diagnosis system based on high idle speed detection method according to claim 1, characterized in that The locking handle (2.2) and the fixed handle (2.3) are provided with anti-skid protection parts.

6. The diesel vehicle DPF failure quick diagnosis system based on high idle speed detection method according to claim 1, characterized in that One end of the sampling pipe (3) is provided with a sampling probe (3.1), the sampling probe (3.1) is connected with the sampling pipe (3) through thread connection, and the sampling pipe (3) adopts a corrugated flexible pipe.

7. The rapid diagnosis system for diesel vehicle DPF failure based on high idle speed detection method according to claim 1, characterized in that, The inlet and outlet of the condensate remover (4) are respectively provided with a sleeve joint, the condensate remover (4) comprises a remover shell, an exhaust passage arranged inside the remover shell and a water absorption material filled between the remover shell and the exhaust passage; The remover shell and the exhaust passage are coaxially arranged, the exhaust passage adopts a steel mesh round pipe, and the water absorption material adopts a reusable water absorbent.

8. The rapid diagnosis system for diesel vehicle DPF failure based on high idle speed detection method according to claim 1, characterized in that, The particulate matter number concentration measuring module (5) is a mobile source emission particulate matter PN bench / portable detector based on condensation nucleus particle counting method or diffusion charging method.

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