Test method for post-processing model development of virtual development platform

Abstract

The invention discloses a test method for development of a post-treatment model of a virtual development platform, and relates to the technical field of diesel engines, a test device adopted by the test method comprises DOC, a DPF, a mixing section, SCR I and SCR II-ASC which are sequentially arranged in the flow direction of waste gas, and S1, a WHTC test for test state confirmation; s2, urea nozzle precision test; s3, a DOC load step test is carried out; s4, a WHTC test of DOC, DPF, SCR I and SCR II-ASC is carried out; s5, ignition tests of DOC and DPF are carried out; s6, an SCR variable ammonia nitrogen ratio test is carried out; s7, a WHSC test of DOC, DPF, SCR I and SCR II-ASC is carried out; and S8, carrying out a high HC test on the DOC. According to the test method for development of the post-processing model of the virtual development platform, the model deviation can be controlled within the range of 15%-20%, meanwhile, the model development data acquisition time is shortened, the model development period is shortened to three weeks, and therefore the model precision and the model development time are both considered, and the development efficiency is improved. And the post-processing model of the virtual development platform has the possibility of deeply participating in project development.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel engines, and more specifically, to a test method for developing a post-processing model on a virtual development platform. Background Art

[0002] For diesel engines, the aftertreatment system is a necessary device to meet the requirements of emission regulations. However, in the actual development process of the engine, the selection of the aftertreatment system is a time-consuming link: first, because the aftertreatment system has many states, it takes a long time to conduct test verification and comparison. This is mainly related to the packaging and coating treatment technology of the aftertreatment system, that is, when the same catalyst ratio is used but different aftertreatment manufacturers are used, the aftertreatment effects obtained are quite different; second, when selecting the aftertreatment, because the internal reaction of the aftertreatment system is closely related to the instantaneous state of the engine, it is difficult to intervene with conventional simulation methods, and it is impossible to provide guidance on the selection of aftertreatment components.

[0003] Based on the above two reasons, the current suitable solution is to use hardware-in-the-loop to simulate the state of the post-processing system, that is, to use a semi-physical simulation mode that combines some engine components + simulation models. However, the above method still has the following defects: First, there is still a large gap between the model calculation value and the actual test value (the gap is more than 30%); second, although the deviation between the calculation and the test can be achieved at about 10%, the process of obtaining test data is too complicated, resulting in more than 3 months to establish a virtual development platform model in actual application, which will seriously hinder the project progress when applied to project development. Summary of the invention

[0004] In order to overcome the defects of the prior art, the present invention proposes an experimental method for the development of post-processing models of virtual development platforms, which can control the model deviation within the range of 15% to 20%, while reducing the data acquisition time for model development, shortening the model development cycle to 3 weeks, thereby taking into account both model accuracy and model development time, and allowing the post-processing model of the virtual development platform to have the possibility of deeply participating in project development.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a test method for developing a post-processing model of a virtual development platform. The test device used in the test method includes a DOC, a DPF, a mixing section, an SCRⅠ and an SCRⅡ-ASC which are sequentially arranged along the exhaust gas flow direction, and the SCRⅠ and the SCRⅡ-ASC are an integrated structure. A first test module is arranged upstream of the DOC and upstream of the SCRⅡ-ASC, and a second test module is arranged downstream of the DOC, downstream of the DPF, upstream of the SCRⅠ and downstream of the SCRⅡ-ASC. The first test module includes a first temperature measuring point, a first pressure measuring point, a first direct sampling measuring point and a first NH3 measuring point. The second test module includes a second temperature measuring point, a second pressure measuring point, a carrier temperature measuring point, a second direct sampling measuring point and a second NH3 measuring point. A urea nozzle is arranged on the mixing section.

[0007] The test method includes the following steps:

[0008] S1. WHTC test for test status confirmation is used to confirm the performance of each component of the test device under transient conditions, as well as the working status of sensors at each temperature and pressure measuring point;

[0009] S2, urea nozzle accuracy test, used to establish the corresponding relationship between ECU injection flow and actual injection flow;

[0010] S3, DOC load step test, is used to parameterize the temperature and pressure drop of the steady-state working condition of the post-processing model of the virtual development platform;

[0011] WHTC test of S4, DOC, DPF, SCRⅠ and SCRⅡ-ASC is used to calibrate the chemical reaction products of DOC, DPF, SCRⅠ and SCRⅡ-ASC;

[0012] Light-off test of S5, DOC and DPF is used to calibrate the CO and HC conversion efficiency;

[0013] S6, SCR variable ammonia nitrogen ratio test, used to calibrate ammonia storage and ammonia oxidation under transient conditions;

[0014] The WHSC test of S7, DOC, DPF, SCRⅠ and SCRⅡ-ASC is used to verify the post-processing model of the virtual development platform after model calibration under steady-state conditions;

[0015] S8, DOC high HC test, is used to simulate the conditions during DPF regeneration, verify the performance of DOC under high HC conditions, and verify the conversion efficiency of DOC under conditions of increased HC and CO emissions.

[0016] In a preferred technical solution of the present invention, the DOC, the DPF, the mixing section and the SCRⅠ are all connected via flanges.

[0017] In a preferred technical solution of the present invention, in step S1, the test requires two gas analyzers and one ammonia analyzer, wherein one gas analyzer is arranged at the first direct sampling measuring point upstream of the DOC, for detecting the gas components upstream of the DOC, and the other gas analyzer is arranged at the second direct sampling measuring point downstream of the SCRⅡ-ASC, for detecting the gas components downstream of the SCRⅡ-ASC, and the ammonia analyzer is arranged at the second NH3 measuring point downstream of the SCRⅡ-ASC.

[0018] In a preferred technical solution of the present invention, in step S2, a fixed amount of urea is injected through the urea nozzle at different mass flow rates, and the remaining urea is weighed after the injection is completed, and the deviation between the actual weighing value and the ECU value is calculated after weighing.

[0019] In a preferred technical solution of the present invention, in step S3, the test requires two gas analyzers and an AVL483 particle sensor, and the AVL483 particle sensor is arranged upstream of the DOC, wherein one gas analyzer is arranged at the first direct sampling point upstream of the DOC, for detecting the gas components upstream of the DOC, and the other gas analyzer is arranged at the second direct sampling point downstream of the DOC, for detecting the gas components downstream of the DOC.

[0020] In a preferred technical solution of the present invention, in step S4, the test requires two gas analyzers, an AVL483 particle sensor and an ammonia analyzer, the AVL483 particle sensor is arranged upstream of the DOC, and the ammonia analyzer is arranged at the first NH3 measuring point upstream of the SCRⅡ-ASC, wherein, when performing the WHTC test of the DOC, one of the gas analyzers is arranged at the first direct sampling measuring point upstream of the DOC to detect the gas components upstream of the DOC, and the other gas analyzer is arranged at the second direct sampling measuring point downstream of the DOC to detect the gas components downstream of the DOC; perform DP When conducting the WHTC test of SCRⅠ and SCRⅡ-ASC, one of the gas analyzers is set at the second direct sampling point upstream of SCRⅠ to detect the gas components upstream of SCRⅠ, and the other gas analyzer is set at the second direct sampling point downstream of DOC to detect the gas components downstream of DPF. When conducting the WHTC test of SCRⅠ and SCRⅡ-ASC, one of the gas analyzers is set at the second direct sampling point upstream of SCRⅠ to detect the gas components upstream of SCRⅠ, and the other gas analyzer is set at the second direct sampling point downstream of SCRⅡ-ASC to detect the gas components downstream of SCRⅡ-ASC.

[0021] In a preferred technical solution of the present invention, in step S5, the test requires two gas analyzers and one AVL483 particle sensor, and the AVL483 particle sensor is arranged upstream of the DOC. When conducting the ignition test of the DOC, one of the gas analyzers is arranged at the first direct sampling point upstream of the DOC to detect the gas components upstream of the DOC, and the other gas analyzer is arranged at the second direct sampling point downstream of the DOC to detect the gas components downstream of the DOC; when conducting the ignition experiment of the DPF, one of the gas analyzers is arranged at the second direct sampling point downstream of the DOC to detect the gas components upstream of the DPF, and the other gas analyzer is arranged at the second direct sampling point downstream of the DPF to detect the gas components downstream of the DPF.

[0022] In a preferred technical solution of the present invention, in step S6, the test requires two gas analyzers, an AVL483 particle sensor and an ammonia analyzer, the AVL483 particle sensor is arranged upstream of the DOC, the ammonia analyzer is arranged at the first NH3 measuring point upstream of the SCRⅡ-ASC, one of the gas analyzers is arranged at the second direct sampling measuring point upstream of the SCRⅠ, and the other gas analyzer is arranged at the second direct sampling measuring point downstream of the SCRⅡ-ASC.

[0023] In a preferred technical solution of the present invention, in step S7, the test requires two gas analyzers, an AVL483 particle sensor and an ammonia analyzer, the AVL483 particle sensor is arranged upstream of the DOC, and the ammonia analyzer is arranged at the first NH3 measuring point upstream of the SCRⅡ-ASC, wherein, when performing the WHSC test of the DOC, one of the gas analyzers is arranged at the first direct sampling measuring point upstream of the DOC to detect the gas components upstream of the DOC, and the other gas analyzer is arranged at the second direct sampling measuring point downstream of the DOC to detect the gas components downstream of the DOC; performing the DP When conducting the WHSC experiment of SCRⅠ and SCRⅡ-ASC, one of the gas analyzers is set at the second direct sampling point upstream of SCRⅠ to detect the gas components upstream of SCRⅠ, and the other gas analyzer is set at the second direct sampling point downstream of DOC to detect the gas components upstream of DPF; when conducting the WHSC test of SCRⅠ and SCRⅡ-ASC, one of the gas analyzers is set at the second direct sampling point upstream of SCRⅠ to detect the gas components upstream of SCRⅠ, and the other gas analyzer is set at the second direct sampling point downstream of SCRⅡ-ASC to detect the gas components downstream of SCRⅡ-ASC.

[0024] In a preferred technical solution of the present invention, in step S8, the test requires two gas analyzers and an AVL483 particle sensor, and the AVL483 particle sensor is arranged upstream of the DOC, wherein one gas analyzer is arranged at the first direct sampling point upstream of the DOC to detect the gas components upstream of the DOC, and the other gas analyzer is arranged at the second direct sampling point downstream of the DOC to detect the gas components downstream of the DOC.

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention proposes an experimental method for the development of a post-processing model for a virtual development platform, which can control the model deviation within the range of 15% to 20%, while reducing the time for acquiring model development data, shortening the model development cycle to 3 weeks, thereby taking into account both model accuracy and model development time, and allowing the post-processing model of the virtual development platform to have the possibility of deeply participating in project development.

[0027] 2. The current test data used for the development of virtual development platform models are different. Due to different test focuses, the control differences in test conditions are also large. This test method is based on the conditions for chemical reactions. While simplifying the test time, it can ensure that the accuracy of virtual development platform model development is not significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a flowchart of an experimental method for developing a post-processing model for a virtual development platform provided by a specific embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the test device.

[0030] In the figure:

[0031] 1. DOC; 2. DPF; 3. Mixing section; 4. SCRⅠ; 5. SCRⅡ-ASC; 6. First test module; 61. First temperature measuring point; 62. First pressure measuring point; 63. First direct sampling measuring point; 64. First NH3 measuring point; 7. Second test module; 71. Second temperature measuring point; 72. Second pressure measuring point; 73. Carrier temperature measuring point; 74. Second direct sampling measuring point; 75. Second NH3 measuring point; 8. Urea nozzle; 9. Flange. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0033] like Figure 1-2As shown, an experimental method for developing a post-processing model for a virtual development platform is provided in the embodiment. The experimental device used in the experimental method includes DOC1, DPF2, a mixing section 3, SCRⅠ4 and SCRⅡ-ASC5 arranged in sequence along the exhaust gas flow direction, and SCRⅠ4 and SCRⅡ-ASC5 are an integrated structure. A first test module 6 is arranged upstream of DOC1 and upstream of SCRⅡ-ASC5, and a second test module 7 is arranged downstream of DOC1, downstream of DPF2, upstream of SCRⅠ4 and downstream of SCRⅡ-ASC5. The first test module 6 includes a first temperature measuring point 61, a first pressure measuring point 62, a first direct sampling measuring point 63 and a first NH3 measuring point 64. The second test module 7 includes a second temperature measuring point 71, a second pressure measuring point 72, a carrier temperature measuring point 73, a second direct sampling measuring point 74 and a second NH3 measuring point 75. A urea nozzle 8 is arranged on the mixing section 3;

[0034] The test method includes the following steps:

[0035] S1. WHTC test for test status confirmation is used to confirm the performance of each component of the test device under transient conditions, as well as the working status of sensors at each temperature and pressure measuring point;

[0036] S2, urea nozzle 8 precision test, used to establish the corresponding relationship between ECU injection flow and actual injection flow;

[0037] S3 and DOC1 load step tests are used to parameterize the temperature and pressure drop of the steady-state working conditions of the post-processing model of the virtual development platform;

[0038] The WHTC test of S4, DOC1, DPF2, SCRⅠ4 and SCRⅡ-ASC5 is used to calibrate the chemical reaction products of DOC1, DPF2, SCRⅠ4 and SCRⅡ-ASC5;

[0039] Light-off test of S5, DOC1 and DPF2 is used to calibrate the CO and HC conversion efficiency;

[0040] S6, SCR variable ammonia nitrogen ratio test, used to calibrate ammonia storage and ammonia oxidation under transient conditions;

[0041] The WHSC tests of S7, DOC1, DPF2, SCRⅠ4 and SCRⅡ-ASC5 are used to verify the post-processing model of the virtual development platform after model calibration under steady-state conditions;

[0042] S8, DOC1 high HC test, is used to simulate the conditions during DPF2 regeneration, verify the performance of DOC1 under high HC conditions, and verify the conversion efficiency of DOC1 under conditions of increased HC and CO emissions.

[0043] In this embodiment, the engine exhaust gas will be discharged after passing through DOC1, DPF2, mixing section 3, SCRⅠ4 and SCRⅡ-ASC5 in sequence, and according to the flow direction of the exhaust gas, the side where the gas flows in represents the upstream, and the side where the gas is discharged represents the downstream. DOC1 is used to oxidize carbon monoxide and hydrocarbons in the exhaust gas, converting them into harmless CO2 and H2O, and converting NO into NO2. DPF2 is used to capture particulate matter in the exhaust gas. Mixing section 3 is used to fully mix urea with the exhaust gas, thereby providing a reducing agent for the reduction reaction of nitrogen oxides. SCRⅠ4 is used to convert NO in the exhaust gas into x Reduced to N2 and H2O, SCRⅡ-ASC5 is used to remove excess ammonia generated when urea is decomposed, and the structures of DOC, DPF, mixing section, SCRⅠ and SCRⅡ-ASC are all existing technologies and will not be repeated here. The first temperature measuring point 61, the second temperature measuring point 71 and the carrier temperature measuring point 73 are all provided with temperature sensors. The temperature sensors at the first temperature measuring point 61 and the second temperature measuring point 71 are used to detect the temperature of the exhaust gas, and the temperature sensor at the carrier temperature measuring point 73 is used to detect the carrier temperature (i.e., the temperature of the components such as DOC and DPF themselves). The first pressure measuring point 62 and the second pressure measuring point 72 are both provided with pressure sensors for detecting the gas pressure of the exhaust gas. The first direct sampling measuring point 63 and the second direct sampling measuring point 74 are both provided with gas analyzers for detecting the composition of the exhaust gas. The first NH3 measuring point 64 and the second NH3 measuring point 75 are both provided with ammonia analyzers for detecting the content of ammonia in the exhaust gas. The urea nozzle 8 is provided at the top of the mixing section 3 to spray urea into the mixing section 3. The WHTC test is a transient cycle test condition, and the WHSC test is a steady cycle test condition. In addition, the above tests are necessary tests to ensure the accuracy of the post-processing model of the virtual development platform, which takes about 90 hours. The data obtained by this test method can ensure the accuracy of the post-processing model development of the virtual development platform within 15% to 20%, which can be used to guide the selection of post-processing components and the development of the entire engine.

[0044] Specifically, DOC1, DPF2, mixing section 3 and SCRⅠ4 are all connected via flange 9.

[0045] Specifically, in step S1, the test requires two gas analyzers and one ammonia analyzer, one of the gas analyzers is set at the first direct sampling measuring point 63 upstream of DOC1, for detecting the gas components upstream of DOC1, the other gas analyzer is set at the second direct sampling measuring point 74 downstream of SCRⅡ-ASC5, for detecting the gas components downstream of SCRⅡ-ASC5, and the ammonia analyzer is set at the second NH3 measuring point 75 downstream of SCRⅡ-ASC5, for detecting the ammonia content at the downstream outlet of SCRⅡ-ASC5.

[0046] Specifically, in step S2, a fixed amount of urea is injected through the urea nozzle 8 at different mass flow rates, and the remaining urea is weighed after the injection is completed. After weighing, the deviation between the actual weighing value and the ECU value is calculated.

[0047] Specifically, in step S3, the test requires two gas analyzers and one AVL483 particle sensor. The AVL483 particle sensor is set upstream of DOC1, one of the gas analyzers is set at the first direct sampling point 63 upstream of DOC1 to detect the gas components upstream of DOC1, and the other gas analyzer is set at the second direct sampling point 74 downstream of DOC1 to detect the gas components downstream of DOC1. The AVL483 particle sensor is used to detect the particle concentration in the exhaust gas.

[0048] Specifically, in step S4, the test requires two gas analyzers, an AVL483 particle sensor and an ammonia analyzer. The AVL483 particle sensor is set upstream of DOC1, and the ammonia analyzer is set at the first NH3 measuring point 64 upstream of SCRⅡ-ASC5. When performing the WHTC test of DOC1, one of the gas analyzers is set at the first direct sampling measuring point 63 upstream of DOC1 to detect the gas components upstream of DOC1, and the other gas analyzer is set at the second direct sampling measuring point 74 downstream of DOC1 to detect the gas components downstream of DOC1; when performing the WHTC test of DPF2, During the test, one of the gas analyzers is set at the second direct sampling point 74 downstream of DOC1 to detect the gas components upstream of DPF2, and the other gas analyzer is set at the second direct sampling point 74 downstream of DPF2 to detect the gas components downstream of DPF2; when conducting the WHTC test of SCRⅠ4 and SCRⅡ-ASC5, one of the gas analyzers is set at the second direct sampling point 74 upstream of SCRⅠ4 to detect the gas components upstream of SCRⅠ4, and the other gas analyzer is set at the second direct sampling point 74 downstream of SCRⅡ-ASC5 to detect the gas components downstream of SCRⅡ-ASC5.

[0049] Specifically, in step S5, the test requires two gas analyzers and an AVL483 particle sensor. The AVL483 particle sensor is arranged upstream of DOC1. When conducting the ignition test of DOC1, one of the gas analyzers is arranged at the first direct sampling measuring point 63 upstream of DOC1 to detect the gas components upstream of DOC1, and the other gas analyzer is arranged at the second direct sampling measuring point 74 downstream of DOC1 to detect the gas components downstream of DOC1. When conducting the ignition experiment of DPF2, one of the gas analyzers is arranged at the second direct sampling measuring point 74 downstream of DOC1 to detect the gas components upstream of DPF2, and the other gas analyzer is arranged at the second direct sampling measuring point 74 downstream of DPF2 to detect the gas components downstream of DPF2.

[0050] Specifically, in step S6, the test requires two gas analyzers, an AVL483 particle sensor and an ammonia analyzer. The AVL483 particle sensor is arranged upstream of DOC1, and the ammonia analyzer is arranged at the first NH3 measuring point 64 upstream of SCRⅡ-ASC5. One of the gas analyzers is arranged at the second direct sampling measuring point 74 upstream of SCRⅠ4, and the other gas analyzer is arranged at the second direct sampling measuring point 74 downstream of SCRⅡ-ASC5.

[0051] Specifically, in step S7, the test requires two gas analyzers, an AVL483 particle sensor and an ammonia analyzer. The AVL483 particle sensor is set at the upstream of DOC1, and the ammonia analyzer is set at the first NH3 measuring point 64 upstream of SCRⅡ-ASC5. When performing the WHSC test of DOC1, one of the gas analyzers is set at the first direct sampling measuring point 63 upstream of DOC1 to detect the gas components upstream of DOC1, and the other gas analyzer is set at the second direct sampling measuring point 74 downstream of DOC1 to detect the gas components downstream of DOC1; when performing the WHSC test of DPF2, During the test, one of the gas analyzers is set at the second direct sampling point 74 downstream of DOC1 to detect the gas components upstream of DPF2, and the other gas analyzer is set at the second direct sampling point 74 downstream of DPF2 to detect the gas components downstream of DPF2; when conducting the WHSC test of SCRⅠ4 and SCRⅡ-ASC5, one of the gas analyzers is set at the second direct sampling point 74 upstream of SCRⅠ4 to detect the gas components upstream of SCRⅠ4, and the other gas analyzer is set at the second direct sampling point 74 downstream of SCRⅡ-ASC5 to detect the gas components downstream of SCRⅡ-ASC5.

[0052] Specifically, in step S8, the test requires two gas analyzers and an AVL483 particle sensor. The AVL483 particle sensor is set upstream of DOC1. One of the gas analyzers is set at the first direct sampling measurement point 63 upstream of DOC1 to detect the gas components upstream of DOC1, and the other gas analyzer is set at the second direct sampling measurement point 74 downstream of DOC1 to detect the gas components downstream of DOC1.

[0053] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A test method for post-processing model development on a virtual development platform, characterized in that: The test device used in the test method comprises a DOC (1), a DPF (2), a mixing section (3), an SCRⅠ (4) and an SCRⅡ-ASC (5) which are arranged in sequence along the exhaust gas flow direction, and the SCRⅠ (4) and the SCRⅡ-ASC (5) are of an integrated structure, a first test module (6) is arranged upstream of the DOC (1) and upstream of the SCRⅡ-ASC (5), a second test module (7) is arranged downstream of the DOC (1), downstream of the DPF (2), upstream of the SCRⅠ (4) and downstream of the SCRⅡ-ASC (5), the first test module (6) comprises a first temperature measuring point (61), a first pressure measuring point (62), a first direct sampling measuring point (63) and a first NH3 measuring point (64), the second test module (7) comprises a second temperature measuring point (71), a second pressure measuring point (72), a carrier temperature measuring point (73), a second direct sampling measuring point (74) and a second NH3 measuring point (75), and a urea nozzle (8) is arranged on the mixing section (3); The test method includes the following steps: S1. WHTC test for test status confirmation is used to confirm the performance of each component of the test device under transient conditions, as well as the working status of sensors at each temperature and pressure measuring point; S2, urea nozzle (8) accuracy test, used to establish the corresponding relationship between ECU injection flow rate and actual injection flow rate; S3, DOC (1) load step test, used to parameterize the temperature and pressure drop of the steady-state condition of the post-processing model of the virtual development platform; S4, WHTC test of DOC (1), DPF (2), SCRⅠ (4) and SCRⅡ-ASC (5), used to calibrate the chemical reaction products of DOC (1), DPF (2), SCRⅠ (4) and SCRⅡ-ASC (5); S5, DOC (1), DPF (2) light-off test, used to calibrate CO and HC conversion efficiency; S6, SCR variable ammonia nitrogen ratio test, used to calibrate ammonia storage and ammonia oxidation under transient conditions; The WHSC tests of S7, DOC (1), DPF (2), SCRⅠ (4) and SCRⅡ-ASC (5) are used to verify the post-processing model of the virtual development platform after model calibration under steady-state conditions; S8, high HC test of DOC (1), is used to simulate the conditions during DPF (2) regeneration, verify the performance of DOC (1) under high HC conditions, and verify the conversion efficiency of DOC (1) under conditions of increased HC and CO emissions.

2. The experimental method for developing a post-processing model for a virtual development platform according to claim 1, characterized in that: The DOC (1), the DPF (2), the mixing section (3) and the SCRⅠ (4) are all connected via a flange (9).

3. The experimental method for post-processing model development of a virtual development platform according to claim 1, characterized in that: In step S1, the test requires two gas analyzers and one ammonia analyzer, wherein one gas analyzer is arranged at the first direct sampling measuring point (63) upstream of the DOC (1) for detecting the gas components upstream of the DOC (1), and the other gas analyzer is arranged at the second direct sampling measuring point (74) downstream of the SCRⅡ-ASC (5) for detecting the gas components downstream of the SCRⅡ-ASC (5), and the ammonia analyzer is arranged at the second NH3 measuring point (75) downstream of the SCRⅡ-ASC (5).

4. The experimental method for post-processing model development of a virtual development platform according to claim 1, characterized in that: In step S2, a fixed amount of urea is injected through the urea nozzle (8) at different mass flow rates, and the remaining urea is weighed after the injection is completed, and the deviation between the actual weighed value and the ECU value is calculated after weighing.

5. The experimental method for post-processing model development of a virtual development platform according to claim 1, characterized in that: In step S3, the test requires two gas analyzers and an AVL483 particle sensor. The AVL483 particle sensor is arranged upstream of the DOC (1). One of the gas analyzers is arranged at the first direct sampling point (63) upstream of the DOC (1) to detect the gas components upstream of the DOC (1). The other gas analyzer is arranged at the second direct sampling point (74) downstream of the DOC (1) to detect the gas components downstream of the DOC (1).

6. The test method for post-processing model development of a virtual development platform according to claim 1, characterized in that: In step S4, the test requires two gas analyzers, an AVL483 particle sensor and an ammonia analyzer. The AVL483 particle sensor is arranged upstream of the DOC (1), and the ammonia analyzer is arranged at the first NH3 measuring point (64) upstream of the SCRⅡ-ASC (5). When the WHTC test of the DOC (1) is performed, one of the gas analyzers is arranged at the first direct sampling measuring point (63) upstream of the DOC (1) to detect the gas components upstream of the DOC (1), and the other gas analyzer is arranged at the second direct sampling measuring point (74) downstream of the DOC (1) to detect the gas components downstream of the DOC (1). When the WHTC test of the DPF (2) is performed, One of the gas analyzers is arranged at a second direct sampling point (74) downstream of the DOC (1) to detect the gas components upstream of the DPF (2), and the other gas analyzer is arranged at the second direct sampling point (74) downstream of the DPF (2) to detect the gas components downstream of the DPF (2); when performing the WHTC test of the SCRⅠ (4) and the SCRⅡ-ASC (5), one of the gas analyzers is arranged at the second direct sampling point (74) upstream of the SCRⅠ (4) to detect the gas components upstream of the SCRⅠ (4), and the other gas analyzer is arranged at the second direct sampling point (74) downstream of the SCRⅡ-ASC (5) to detect the gas components downstream of the SCRⅡ-ASC (5).

7. The test method for post-processing model development of a virtual development platform according to claim 1, characterized in that: In step S5, the test requires two gas analyzers and one AVL483 particle sensor, the AVL483 particle sensor being arranged upstream of the DOC (1), wherein, when conducting the ignition test of the DOC (1), one of the gas analyzers is arranged at the first direct sampling point (63) upstream of the DOC (1) to detect the gas components upstream of the DOC (1), and the other gas analyzer is arranged at the second direct sampling point (74) downstream of the DOC (1) to detect the gas components downstream of the DOC (1); when conducting the ignition test of the DPF (2), one of the gas analyzers is arranged at the second direct sampling point (74) downstream of the DOC (1) to detect the gas components upstream of the DPF (2), and the other gas analyzer is arranged at the second direct sampling point (74) downstream of the DPF (2) to detect the gas components downstream of the DPF (2).

8. The test method for post-processing model development of a virtual development platform according to claim 1, characterized in that: In step S6, the test requires two gas analyzers, an AVL483 particle sensor and an ammonia analyzer, the AVL483 particle sensor is arranged upstream of the DOC (1), the ammonia analyzer is arranged at the first NH3 measuring point (64) upstream of the SCRⅡ-ASC (5), one of the gas analyzers is arranged at the second direct sampling measuring point (74) upstream of the SCRⅠ (4), and the other gas analyzer is arranged at the second direct sampling measuring point (74) downstream of the SCRⅡ-ASC (5).

9. The test method for post-processing model development of a virtual development platform according to claim 1, characterized in that: In step S7, the test requires two gas analyzers, an AVL483 particle sensor and an ammonia analyzer. The AVL483 particle sensor is arranged upstream of the DOC (1), and the ammonia analyzer is arranged at the first NH3 measuring point (64) upstream of the SCRⅡ-ASC (5). When the WHSC test of the DOC (1) is performed, one of the gas analyzers is arranged at the first direct sampling measuring point (63) upstream of the DOC (1) to detect the gas components upstream of the DOC (1), and the other gas analyzer is arranged at the second direct sampling measuring point (74) downstream of the DOC (1) to detect the gas components downstream of the DOC (1). When the WHSC test of the DPF (2) is performed, One of the gas analyzers is arranged at the second direct sampling point (74) downstream of the DOC (1) to detect the gas components upstream of the DPF (2), and the other gas analyzer is arranged at the second direct sampling point (74) downstream of the DPF (2) to detect the gas components downstream of the DPF (2); when performing the WHSC test of the SCRⅠ (4) and the SCRⅡ-ASC (5), one of the gas analyzers is arranged at the second direct sampling point (74) upstream of the SCRⅠ (4) to detect the gas components upstream of the SCRⅠ (4), and the other gas analyzer is arranged at the second direct sampling point (74) downstream of the SCRⅡ-ASC (5) to detect the gas components downstream of the SCRⅡ-ASC (5).

10. The test method for post-processing model development of a virtual development platform according to claim 1, characterized in that: In step S8, the test requires two gas analyzers and an AVL483 particle sensor. The AVL483 particle sensor is arranged upstream of the DOC (1). One of the gas analyzers is arranged at the first direct sampling point (63) upstream of the DOC (1) to detect the gas components upstream of the DOC (1), and the other gas analyzer is arranged at the second direct sampling point (74) downstream of the DOC (1) to detect the gas components downstream of the DOC (1).

Images