A test method for post-processing model development of a virtual development platform

Abstract

The application discloses a kind of test methods for virtual development platform post-processing model development, it is related to diesel engine technical field, and the test device of test method includes DOC, DPF, mixed section, SCR I and SCR II-ASC sequentially arranged along exhaust gas flow direction, S1, WHTC test of test state confirmation;S2, urea nozzle precision test;S3, DOC load step test;S4, DOC, DPF, SCR I and SCR II-ASC WHTC test;S5, DOC, DPF light-off test;S6, SCR ammonia nitrogen ratio test;S7, DOC, DPF, SCR I and SCR II-ASC WHSC test;S8, high HC test of DOC.The test method for virtual development platform post-processing model development proposed in the application can control model deviation within 15% to 20%, reduce model development data acquisition time, shorten model development cycle to 3 weeks, so as to consider model precision and model development time, make virtual development platform post-processing model have the possibility of deep participation in project development.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel engines, and more particularly 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 essential to meeting emission regulations. However, during actual engine development, selecting the aftertreatment system is a time-consuming process. First, because the aftertreatment system has numerous states, conducting test verification and comparisons takes a long time. This is mainly related to the packaging and coating technology of the aftertreatment system. That is, when using the same catalyst ratio but different aftertreatment manufacturers, the aftertreatment results vary significantly. Second, when selecting the aftertreatment system, the internal reactions of the aftertreatment system are closely related to the instantaneous state of the engine, making it difficult to use conventional simulation methods to guide 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 after-processing system, that is, to adopt a semi-physical simulation mode that combines some engine components with simulation models. However, the above method still has the following defects: First, the gap between the model calculation value and the actual test value is still large (the gap is more than 30%); Second, although the deviation between the calculation and the test can be reduced to about 10%, the process of obtaining test data is too complicated. As a result, in actual application, it takes more than 3 months to establish a virtual development platform model, which will seriously slow down the project progress when applied to project development. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the present invention proposes an experimental method for the development of post-processing models for virtual development platforms, 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 virtual development platform post-processing model to have the possibility of in-depth participation in project development.

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

[0006] The application provides a test method for virtual development platform post-processing model development, and the test device of the test method comprises DOC, DPF, a mixing section, SCR I and SCR II-ASC arranged in sequence along the exhaust gas flow direction, and the SCR I and the SCR II-ASC are integrated structures, first test modules are arranged upstream of the DOC and upstream of the SCR II-ASC, second test modules are arranged downstream of the DOC, downstream of the DPF, upstream of the SCR I and downstream of the SCR II-ASC, the first test module comprises a first temperature measuring point, a first pressure measuring point, a first straight sampling measuring point and a first NH3 measuring point, the second test module comprises a second temperature measuring point, a second pressure measuring point, a carrier temperature measuring point, a second straight sampling measuring point and a second NH3 measuring point, and a urea nozzle is arranged on the mixing section.

[0007] The test method comprises the following steps:

[0008] S1, WHTC test for confirming test state, used for confirming the performance of each component of the test device under transient operating conditions and the working state of sensors at each temperature measuring point and pressure measuring point;

[0009] S2, urea nozzle precision test, used for establishing the corresponding relationship between ECU injection flow and actual injection flow;

[0010] S3, DOC load step test, used for parameterizing the temperature and pressure drop parameters of the virtual development platform post-processing model under steady operating conditions;

[0011] S4, WHTC test of the DOC, the DPF, the SCR I and the SCR II-ASC, used for calibrating the chemical reaction products of the DOC, the DPF, the SCR I and the SCR II-ASC;

[0012] S5, light-off test of the DOC and the DPF, used for calibrating the CO and HC conversion efficiency;

[0013] S6, SCR ammonia storage and ammonia oxidation ratio test, used for calibrating ammonia storage and ammonia oxidation under transient operating conditions;

[0014] S7, WHSC test of the DOC, the DPF, the SCR I and the SCR II-ASC, used for verifying the virtual development platform post-processing model after model calibration under steady operating conditions;

[0015] S8, high-HC test of the DOC, used for simulating the condition when the DPF is regenerated, verifying the performance of the DOC under high-HC condition, and verifying the conversion efficiency of the DOC under the condition that HC and CO emissions are increased.

[0016] In the preferable technical scheme of the application, the DOC, the DPF, the mixing section and the SCR I are connected through flanges.

[0017] In the preferred technical solution of the present application, in step S1, the test requires two gas analyzers and an ammonia analyzer, one of the gas analyzers is arranged at the first straight sampling point upstream of the DOC for detecting the gas components upstream of the DOC, the other gas analyzer is arranged at the second straight sampling point downstream of the SCR II-ASC for detecting the gas components downstream of the SCR II-ASC, and the ammonia analyzer is arranged at the second NH3 sampling point downstream of the SCR II-ASC.

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

[0019] In the preferred technical solution of the present application, in step S3, the test requires two gas analyzers and an AVL483 particulate sensor, the AVL483 particulate sensor is arranged upstream of the DOC, one of the gas analyzers is arranged at the first straight 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 straight sampling point downstream of the DOC for detecting the gas components downstream of the DOC.

[0020] In the preferred technical solution of the present application, in step S4, the test requires two gas analyzers, an AVL483 particulate sensor, and an ammonia analyzer, the AVL483 particulate sensor is arranged upstream of the DOC, and the ammonia analyzer is arranged at the first NH3 sampling point upstream of the SCR II-ASC, wherein, when performing the WHTC test of the DOC, one of the gas analyzers is arranged at the first straight 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 straight sampling point downstream of the DOC for detecting the gas components downstream of the DOC; when performing the WHTC test of the DPF, one of the gas analyzers is arranged at the second straight sampling point downstream of the DOC for detecting the gas components upstream of the DPF, and the other gas analyzer is arranged at the second straight sampling point downstream of the DPF for detecting the gas components downstream of the DPF; when performing the WHTC test of the SCR I and the SCR II-ASC, one of the gas analyzers is arranged at the second straight sampling point upstream of the SCR I for detecting the gas components upstream of the SCR I, and the other gas analyzer is arranged at the second straight sampling point downstream of the SCR II-ASC for detecting the gas components downstream of the SCR II-ASC.

[0021] In the preferred technical solution of the present application, in step S5, the test requires two gas analyzers and an AVL483 particulate sensor, which is arranged upstream of the DOC, wherein, when conducting the light-off test of the DOC, one of the gas analyzers is arranged at the first straight 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 straight sampling point downstream of the DOC to detect the gas components downstream of the DOC; when conducting the light-off test of the DPF, one of the gas analyzers is arranged at the second straight 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 straight sampling point downstream of the DPF to detect the gas components downstream of the DPF.

[0022] In the preferred technical solution of the present application, in step S6, the test requires two gas analyzers, an AVL483 particulate sensor and an ammonia analyzer, the AVL483 particulate sensor is arranged upstream of the DOC, the ammonia analyzer is arranged at the first NH3 sampling point upstream of the SCR II-ASC, one of the gas analyzers is arranged at the second straight sampling point upstream of the SCR I, and the other gas analyzer is arranged at the second straight sampling point downstream of the SCR II-ASC.

[0023] In the preferred technical solution of the present application, in step S7, the test requires two gas analyzers, an AVL483 particulate sensor and an ammonia analyzer, the AVL483 particulate sensor is arranged upstream of the DOC, the ammonia analyzer is arranged at the first NH3 sampling point upstream of the SCR II-ASC, wherein, when conducting the WHSC test of the DOC, one of the gas analyzers is arranged at the first straight 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 straight sampling point downstream of the DOC to detect the gas components downstream of the DOC; when conducting the WHSC test of the DPF, one of the gas analyzers is arranged at the second straight 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 straight sampling point downstream of the DPF to detect the gas components downstream of the DPF; when conducting the WHSC test of the SCR I and the SCR II-ASC, one of the gas analyzers is arranged at the second straight sampling point upstream of the SCR I to detect the gas components upstream of the SCR I, and the other gas analyzer is arranged at the second straight sampling point downstream of the SCR II-ASC to detect the gas components downstream of the SCR II-ASC.

[0024] In the preferred technical solution of the present application, in step S8, the test requires two gas analyzers and an AVL483 particulate sensor, which is arranged upstream of the DOC, one of the gas analyzers is arranged at the first straight 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 straight sampling point downstream of the DOC to detect the gas components downstream of the DOC.

[0025] The present application has the following beneficial effects:

[0026] 1. The test method for developing a post-processing model of a virtual development platform provided by the present application can control the model deviation within the range of 15% to 20%, reduce the data acquisition time for model development, shorten the model development period to 3 weeks, and thus balance the model precision and model development time, so that the post-processing model of the virtual development platform has the possibility of deeply participating in project development.

[0027] 2. The test data for developing a model of a virtual development platform currently varies, the test conditions differ greatly due to different test focuses, and the test method based on the chemical reaction condition can ensure that the model development precision of the virtual development platform is not obviously reduced while the test time is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 is a flow chart of a test method for developing a post-processing model of a virtual development platform provided by the embodiment of the present application;

[0029] Fig. 2 is a structural schematic view of a test device.

[0030] In the drawings:

[0031] 1. DOC; 2. DPF; 3. mixing section; 4. SCR I; 5. SCR II-ASC; 6. first test module; 61. first temperature measuring point; 62. first pressure measuring point; 63. first straight sampling 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 straight sampling point; 75. second NH3 measuring point; 8. urea nozzle; 9. flange. DETAILED DESCRIPTION

[0032] The technical solution of the present application will be further described below by combining the drawings and through specific embodiments.

[0033] As Figs. 1-2As shown, the embodiment provides a test method for virtual development platform post-processing model development, the test device used by the test method comprises DOC1, DPF2, mixing section 3, SCR I 4 and SCR II-ASC 5 arranged in sequence along the exhaust gas flow direction, and SCR I 4 and SCR II-ASC 5 are integrated structure, the upstream of DOC1 and the upstream of SCR II-ASC 5 are provided with first test module 6, the downstream of DOC1, the downstream of DPF2, the upstream of SCR I 4 and the downstream of SCR II-ASC 5 are provided with second test module 7, the first test module 6 comprises first temperature measuring point 61, first pressure measuring point 62, first direct sampling measuring point 63 and first NH3 measuring point 64, the second test module 7 comprises second temperature measuring point 71, second pressure measuring point 72, carrier temperature measuring point 73, second direct sampling measuring point 74 and second NH3 measuring point 75, and the mixing section 3 is provided with urea nozzle 8;

[0034] The test method comprises the following steps:

[0035] S1, WHTC test for confirming test state, used for confirming the performance of each component of the test device under transient operating conditions, and the working state of the sensors at each temperature measuring point and pressure measuring point;

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

[0037] S3, DOC1 load step test, used for parameterizing the temperature and pressure drop of the virtual development platform post-processing model under steady operating conditions;

[0038] S4, WHTC test of DOC1, DPF2, SCR I 4 and SCR II-ASC 5, used for calibrating the chemical reaction products of DOC1, DPF2, SCR I 4 and SCR II-ASC 5;

[0039] S5, DOC1, DPF2 light-off test, used for calibrating CO and HC conversion efficiency;

[0040] S6, SCR ammonia storage and ammonia oxidation ratio test, used for calibrating ammonia storage and ammonia oxidation under transient operating conditions;

[0041] S7, WHSC test of DOC1, DPF2, SCR I 4 and SCR II-ASC 5, used for verifying the virtual development platform post-processing model after model calibration under steady operating conditions;

[0042] S8, high HC test of DOC1, used for simulating the condition when DPF2 is regenerated, verifying the performance of DOC1 under high HC condition, and verifying the conversion efficiency of DOC1 under the condition of increased HC and CO emissions.

[0043] In this embodiment, the engine exhaust gas will pass through DOC1, DPF2, mixing section 3, SCRⅠ4 and SCRⅡ-ASC5 in sequence before being discharged. 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 reduce NO in the exhaust gas. x The urea is reduced to N2 and H2O. The SCR II-ASC 5 is used to remove excess ammonia produced during urea decomposition. The structures of the DOC, DPF, mixing section, SCR I, and SCR II-ASC are all existing technologies and will not be described in detail here. Temperature sensors are installed at the first temperature measuring point 61, the second temperature measuring point 71, and the carrier temperature measuring point 73. The temperature sensors at the first and second temperature measuring points 61 and 71 are used to detect the temperature of the exhaust gas, while the temperature sensor at the carrier temperature measuring point 73 is used to detect the carrier temperature (i.e., the temperature of the DOC, DPF, and other components themselves). Pressure sensors are installed at the first and second pressure measuring points 62 and 72 to detect the pressure of the exhaust gas. Gas analyzers are installed at the first and second direct sampling points 63 and 74 to detect the composition of the exhaust gas. Ammonia analyzers are installed at the first NH3 measuring point 64 and the second NH3 measuring point 75 to detect the ammonia content in the exhaust gas. A urea nozzle 8 is installed at the top of the mixing section 3 to inject urea into the mixing section 3. The WHTC test is a transient cycle test condition, while the WHSC test is a steady-state cycle test condition. Furthermore, all of the above tests, which took approximately 90 hours to complete, are necessary to ensure the accuracy of the post-processing model for the virtual development platform. The data obtained through this test method can be used to ensure an accuracy error of 15% to 20% when developing the post-processing model for the virtual development platform, and can be used to guide the selection of post-processing components and the overall engine development process.

[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 sprayed by the urea nozzle 8 at different mass flow rates, and the remaining urea is weighed after spraying. After weighing, the deviation between the actual weighed value and the ECU value is calculated.

[0047] Specifically, in step S3, the test requires two gas analyzers and an AVL483 particulate sensor, which is arranged upstream of DOC1. One of the gas analyzers is arranged at the first straight sampling point 63 upstream of DOC1 to detect the gas components upstream of DOC1, and the other gas analyzer is arranged at the second straight sampling point 74 downstream of DOC1 to detect the gas components downstream of DOC1. The AVL483 particulate sensor is used to detect the particulate concentration in the exhaust gas.

[0048] Specifically, in step S4, the test requires two gas analyzers, an AVL483 particulate sensor, and an ammonia analyzer, which is arranged at the first NH3 sampling point 64 upstream of SCR II-ASC5. When performing the WHTC test of DOC1, one of the gas analyzers is arranged at the first straight sampling point 63 upstream of DOC1 to detect the gas components upstream of DOC1, and the other gas analyzer is arranged at the second straight sampling point 74 downstream of DOC1 to detect the gas components downstream of DOC1. When performing the WHTC test of DPF2, one of the gas analyzers is arranged at the second straight sampling point 74 downstream of DOC1 to detect the gas components upstream of DPF2, and the other gas analyzer is arranged at the second straight sampling point 74 downstream of DPF2 to detect the gas components downstream of DPF2. When performing the WHTC test of SCR I4 and SCR II-ASC5, one of the gas analyzers is arranged at the second straight sampling point 74 upstream of SCR I4 to detect the gas components upstream of SCR I4, and the other gas analyzer is arranged at the second straight sampling point 74 downstream of SCR II-ASC5 to detect the gas components downstream of SCR II-ASC5.

[0049] Specifically, in step S5, the test requires two gas analyzers and one AVL483 particulate sensor, which is arranged upstream of DOC1, wherein, when conducting the light-off test of DOC1, one of the gas analyzers is arranged at the first straight sampling point 63 upstream of DOC1 to detect the gas components upstream of DOC1, and the other gas analyzer is arranged at the second straight sampling point 74 downstream of DOC1 to detect the gas components downstream of DOC1; when conducting the light-off test of DPF2, one of the gas analyzers is arranged at the second straight sampling point 74 downstream of DOC1 to detect the gas components upstream of DPF2, and the other gas analyzer is arranged at the second straight sampling point 74 downstream of DPF2 to detect the gas components downstream of DPF2.

[0050] Specifically, in step S6, the test requires two gas analyzers, one AVL483 particulate sensor, and one ammonia analyzer, the AVL483 particulate sensor is arranged upstream of DOC1, and the ammonia analyzer is arranged at the first NH3 sampling point 64 upstream of SCR II-ASC5, wherein one of the gas analyzers is arranged at the second straight sampling point 74 upstream of SCR I4, and the other gas analyzer is arranged at the second straight sampling point 74 downstream of SCR II-ASC5.

[0051] Specifically, in step S7, the test requires two gas analyzers, one AVL483 particulate sensor, and one ammonia analyzer, the AVL483 particulate sensor is arranged upstream of DOC1, and the ammonia analyzer is arranged at the first NH3 sampling point 64 upstream of SCR II-ASC5, wherein, when conducting the WHSC test of DOC1, one of the gas analyzers is arranged at the first straight sampling point 63 upstream of DOC1 to detect the gas components upstream of DOC1, and the other gas analyzer is arranged at the second straight sampling point 74 downstream of DOC1 to detect the gas components downstream of DOC1; when conducting the WHSC test of DPF2, one of the gas analyzers is arranged at the second straight sampling point 74 downstream of DOC1 to detect the gas components upstream of DPF2, and the other gas analyzer is arranged at the second straight sampling point 74 downstream of DPF2 to detect the gas components downstream of DPF2; when conducting the WHSC test of SCR I4 and SCR II-ASC5, one of the gas analyzers is arranged at the second straight sampling point 74 upstream of SCR I4 to detect the gas components upstream of SCR I4, and the other gas analyzer is arranged at the second straight sampling point 74 downstream of SCR II-ASC5 to detect the gas components downstream of SCR II-ASC5.

[0052] Specifically, in step S8, the test requires two gas analyzers and an AVL 483 particulate sensor, which is arranged upstream of DOC1, one of the gas analyzers is arranged at a first straight-through sampling point 63 upstream of DOC1 to detect the gas components upstream of DOC1, and the other gas analyzer is arranged at a second straight-through sampling point 74 downstream of DOC1 to detect the gas components downstream of DOC1.

[0053] The application is described by preferred embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the application. The application is not limited by the specific embodiments disclosed herein, and other embodiments falling within the claims of the application are within the scope of the application.

Claims

1. A test method for developing a post-processing model for a virtual development platform, characterized by: The test device used in the test method includes a DOC (1), a DPF (2), a mixing section (3), an SCR I (4) and an SCR II-ASC (5) arranged in sequence along the exhaust gas flow direction, and the SCR I (4) and the SCR II-ASC (5) are of an integrated structure. A first test module (6) is provided upstream of the DOC (1) and upstream of the SCR II-ASC (5), and a second test module (7) is provided downstream of the DOC (1), downstream of the DPF (2), upstream of the SCR I (4) and downstream of the SCR II-ASC (5). 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 provided 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 working condition of the post-processing model of the virtual development platform; The WHTC test of S4, DOC (1), DPF (2), SCRⅠ (4) and SCRⅡ-ASC (5) is 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, a 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 SCR I (4) are all connected via flanges (9).

3. The experimental method for developing a post-processing model for 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 set 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 set 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 set at the second NH3 measuring point (75) downstream of the SCRⅡ-ASC (5).

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

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

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

9. The experimental method for developing a post-processing model for a virtual development platform according to claim 1, characterized in that: In step S7, the test requires two gas analyzers, an AVL483 particulate sensor and an ammonia analyzer. The AVL483 particulate sensor is set upstream of the DOC (1), and the ammonia analyzer is set at the first NH3 measuring point (64) upstream of the SCRⅡ-ASC (5). When the WHSC test of the DOC (1) is carried out, one of the gas analyzers is set 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 set 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 carried out, One of the gas analyzers is set 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 set 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 set 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 set 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 experimental method for developing a post-processing model for a virtual development platform according to claim 1, characterized in that: In step S8, the test requires two gas analyzers and one AVL483 particle sensor. The AVL483 particle sensor is set upstream of the DOC (1). One of the gas analyzers is set 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 set at the second direct sampling point (74) downstream of the DOC (1) to detect the gas components downstream of the DOC (1).

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