Test method, test system and test equipment for urea system

Abstract

The invention discloses a test method, a test system and test equipment of a urea system. The test method of the urea system comprises the following steps: determining adjustable test parameters used for simulating the running environment of a whole vehicle; and controlling the urea system to perform an injection test according to the adjustable test parameters. According to the test method, the injection test is performed by simulating the whole vehicle operation environment through the adjustable test parameters, so that the injection test precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of urea pumps, and in particular to a test method of a urea system, a test system of a urea system and test equipment of a urea system. Background Art

[0002] In the relevant technology, urea system is widely used in diesel vehicles that meet the National VI standard. The system can neutralize nitrogen oxides in the exhaust gas. The nozzle in the urea system is particularly important. The injection accuracy of the nozzle can directly affect the emission results of the vehicle's exhaust gas. Therefore, the injection accuracy of the nozzle must be tested in the quality inspection of the nozzle. However, the common nozzle bench test only controls the injection accuracy of the test nozzle through the urea pump. The test environment is single. Due to the complex vehicle environment, the test accuracy is ultimately low. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a test method for a urea system, which simulates the vehicle operating environment through adjustable test parameters to perform injection test, thereby improving the injection test accuracy.

[0004] A second object of the present invention is to provide a testing system for a urea system.

[0005] A third object of the present invention is to provide a testing device for a urea system.

[0006] In order to solve the above problems, a first embodiment of the present invention provides a method for testing a urea system, comprising: determining adjustable test parameters for simulating the operating environment of a whole vehicle; and controlling the urea system to perform an injection test according to the adjustable test parameters.

[0007] According to the test method of the urea system of the embodiment of the present invention, based on the adjustable characteristics of the adjustable test parameters, different vehicle operating environments are simulated by different adjustable test parameters, thereby controlling the urea system to perform an injection test based on the adjustable test parameters determined for simulating the vehicle operating environment, so that the test condition of the urea system can be more consistent with the working state under the vehicle operating environment, thereby improving the test accuracy of the injection test.

[0008] In some embodiments, the adjustable test parameters include at least one or more of an injection environment temperature of the urea system, an injection flow rate of the urea system, an injection rate of the urea system, and an injection time of the urea system.

[0009] In some embodiments, determining the adjustable test parameters for simulating the operating environment of the entire vehicle includes: configuring multiple injection operating modes, wherein each injection operating mode allows adjustment of at least one adjustable test parameter for simulating the operating environment of the entire vehicle; confirming a target injection operating mode from the multiple injection operating modes; and determining the adjustable test parameters for simulating the operating environment of the entire vehicle based on the target injection operating mode.

[0010] In some embodiments, the multiple injection operation modes include at least one or more of a normal temperature operation mode, a high temperature operation mode, a constant flow operation mode, a constant speed operation mode, and a variable speed and variable time cycle operation mode.

[0011] In some embodiments, after controlling the urea system to perform an injection test, the method further includes: acquiring the actual injection parameters of the urea system under different simulated vehicle operating environments; determining theoretical injection parameters of the urea system under different simulated vehicle operating environments; and determining test results of the urea system under at least one vehicle operating environment based on the actual injection parameters and the theoretical injection parameters.

[0012] In some embodiments, determining a test result of the urea system under at least one whole vehicle operating environment according to the actual injection parameter and the theoretical injection parameter includes: determining a deviation percentage under at least one whole vehicle operating environment according to the actual injection parameter and the theoretical injection parameter; and using the deviation percentage as the test result of the urea system.

[0013] In some embodiments, before controlling the urea system to perform an injection test, the method further includes: controlling the urea system to perform an exhaust operation.

[0014] A second aspect of the present invention provides a urea system test system, including: a determination module for determining adjustable test parameters for simulating a vehicle operating environment; and a control module for controlling the urea system to perform an injection test according to the adjustable test parameters.

[0015] According to the test system of the urea system of the embodiment of the present invention, the determination module determines the adjustable test parameters for simulating the operating environment of the whole vehicle, so that the control module controls the urea system to perform the injection test based on the adjustable test parameters determined for simulating the operating environment of the whole vehicle, so that the test condition of the urea system can be more consistent with the working state under the operating environment of the whole vehicle, thereby improving the test accuracy of the injection test.

[0016] A third aspect of the present invention provides a test device for a urea system, comprising: a test device, which is connected to the urea system and is used to simulate the operating environment of the entire vehicle and collect the spray from the urea system; a control device, which is connected to the test device and the urea system, and is used to execute the test method for the urea system of the above embodiment.

[0017] The urea system test equipment according to the embodiment of the present invention can simulate the whole vehicle operating environment to test the urea system, so that the test condition of the urea system is more consistent with the working state under the whole vehicle operating environment, and the test accuracy of the injection test is improved.

[0018] In some embodiments, the urea system includes a nozzle, and the testing device includes: a weighing module, the weighing module is connected to the nozzle and the control device, the weighing module is used to collect the injection material and weigh the injection material; a heating module, the heating module is arranged at the nozzle and connected to the control device, the heating module is used to heat the nozzle to adjust the injection environment temperature at the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a flow chart of a method for testing a urea system according to one embodiment of the present invention; Figure 2 is a flow chart of a method for testing a urea system according to another embodiment of the present invention; Figure 3 is a structural block diagram of a test system for a urea system according to an embodiment of the present invention; Figure 4 is a structural block diagram of a test device for a urea system according to an embodiment of the present invention; Figure 5 Schematic diagram of a test device for a urea system according to one embodiment of the present invention.

[0020] Reference numerals: Urea system test system 100; Urea system test equipment 200; Urea system 300; Determination module 10; control module 20; test device 30; control device 40; nozzle 50; urea pump 60; Weighing module 1; heating module 2; calculation module 3. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0022] In order to solve the above problems, a first embodiment of the present invention provides a method for testing a urea system. The method simulates the operating environment of a vehicle through adjustable test parameters to perform an injection test, and the injection test has higher accuracy.

[0023] Reference below Figure 1 The test method of the urea system according to the embodiment of the present invention is described as follows: Figure 1 As shown, the method includes steps S1 and S2, and the specific steps are as follows.

[0024] Step S1, determining adjustable test parameters for simulating the vehicle operating environment.

[0025] Among them, the adjustable test parameters are test parameters that can be adjusted, that is, the adjustable test parameters are not unique and unchanging, and they are related to the operating environment of the whole vehicle, that is, by adaptively adjusting the adjustable test parameters, simulation of different vehicle operating environments can be achieved.

[0026] Specifically, the vehicle operating environment includes various environmental conditions and working conditions during the operation of the vehicle. There are many factors that affect the injection accuracy, such as engine operating conditions, ambient temperature, etc. Based on this, different adjustable test parameters are selected to reflect the various different vehicle operating environments encountered by the vehicle during actual operation. At the same time, since the vehicle operating environment will continue to change in actual applications, this application utilizes the adjustable characteristics of test parameters. During the test, different adjustable test parameters are set to adapt to changes in the actual operating environment of the vehicle, thereby simulating the vehicle operating environment, approaching the actual vehicle operating environment, and reflecting the vehicle operating environment through adjustable test parameters.

[0027] Step S2, controlling the urea system to perform an injection test according to the adjustable test parameters.

[0028] Specifically, the injection accuracy of the nozzle in the urea system is particularly important. In the related art, when performing an injection test on the nozzle, the urea pump action is directly controlled to detect the injection situation, so the test parameters for the entire urea system are fixed, which results in a relatively single test environment for the urea system. However, the vehicle operating environment is more complex and diverse. Therefore, the above method has the problem of low test accuracy for the urea system, and cannot reflect the test situation of the urea system under different vehicle operating environments. Regarding the problem that the impact of different injection test environments on the injection situation of the urea system is not considered, the present application utilizes adjustable test parameters to simulate the vehicle operating environment, and controls the urea system to perform injection tests under different vehicle operating environments through the adjustable test parameters, so that the working state of the urea system under different vehicle operating environments can be tested more accurately, thereby improving the accuracy of the nozzle test.

[0029] According to the test method of the urea system of the embodiment of the present invention, based on the adjustable characteristics of the adjustable test parameters, different vehicle operating environments are simulated by different adjustable test parameters, thereby controlling the urea system to perform an injection test based on the adjustable test parameters determined for simulating the vehicle operating environment, so that the test condition of the urea system can be more consistent with the working state under the vehicle operating environment, thereby improving the test accuracy of the injection test.

[0030] In some embodiments, the adjustable test parameters include at least one or more of an injection environment temperature of the urea system, an injection flow rate of the urea system, an injection rate of the urea system, and an injection time of the urea system.

[0031] Specifically, during the operation of the vehicle, due to changes in the vehicle operating conditions such as ambient temperature and engine operating conditions, in order to ensure that the nitrogen oxides therein can react completely, the urea system will adjust its injection ambient temperature, the injection flow rate of the urea system, the injection rate of the urea system or the injection time of the urea system. For example, the vehicle will encounter different ambient temperatures during operation, and the chemical reaction between urea and nitrogen oxides in the exhaust gas will be affected by the temperature. If the temperature is low, the reaction may be incomplete, thereby failing to effectively eliminate the exhaust gas. Alternatively, with changes in the driver's driving operation, the engine operating conditions may also change, affecting exhaust emissions. In order to avoid urea waste and effectively eliminate exhaust gas, the urea system will adjust the injection ambient temperature, the injection flow rate of the urea system, the injection rate of the urea system or the injection time of the urea system. In order to ensure that the adjustable test parameters can accurately simulate the operating environment of the entire vehicle and improve the injection test accuracy of the urea system, the present application determines that the adjustable test parameters include at least one or more of the injection ambient temperature of the urea system, the injection flow rate of the urea system, the injection rate of the urea system and the injection time of the urea system. Among them, by adjusting the adjustable test parameters, the test can be completed more quickly for different faulty nozzles. For example, for a nozzle that can only maintain low-speed injection accuracy, the fault problem can be quickly reproduced by setting a high injection rate.

[0032] For example, only the injection environment temperature of the urea system can be used as an adjustable test parameter for simulating the operation environment of the whole vehicle, so that by setting different injection environment temperatures, the injection condition of the urea system at different injection environment temperatures can be tested; or, only the injection flow rate of the urea system can be used as an adjustable test parameter for simulating the operation environment of the whole vehicle, so that by setting different injection flow rates, the injection condition of the urea system at different injection flow rates can be tested; or, the injection flow rate and injection time of the urea system can be used as adjustable test parameters for simulating the operation environment of the whole vehicle at the same time, so that by setting different injection flow rates and different injection times, the injection condition of the urea system at different injection flow rates and different injection times can be tested, etc. There is no limit on the number of types of adjustable test parameters.

[0033] In some embodiments, determining adjustable test parameters for simulating the operating environment of the entire vehicle includes configuring multiple injection operating modes, wherein each injection operating mode allows adjustment of at least one adjustable test parameter for simulating the operating environment of the entire vehicle; confirming a target injection operating mode from the multiple injection operating modes; and determining the adjustable test parameters for simulating the operating environment of the entire vehicle based on the target injection operating mode.

[0034] Specifically, in order to cope with various different usage scenarios of vehicles in actual use, that is, the whole vehicle operating environment, multiple injection operation modes will be pre-configured to ensure that the vehicle's exhaust emissions are qualified, so as to select a target injection operation mode from multiple injection operation modes, and select the adjustable test parameters that can be adjusted in the target injection operation mode to simulate the whole vehicle operating environment, and simulate the whole vehicle operating environment corresponding to the target injection operation mode. In this way, the urea system can be tested in different simulated whole vehicle operating environments through different injection operation modes, and rapid testing of different faulty nozzles can be achieved.

[0035] Among them, since the operating environment of the whole vehicle is relatively complex, in order to more realistically simulate the operating environment of the whole vehicle, this application sets that in each injection operation mode, at least one adjustable test parameter for simulating the operating environment of the whole vehicle is allowed to be adjusted, and the number of adjustable test parameters adjusted in the corresponding injection operation mode is set according to the complexity of the operating environment of the whole vehicle.

[0036] Exemplarily, the multiple injection operation modes may include three types: one injection operation mode only supports adjustment of one adjustable test parameter, such as the injection environment temperature can be selected as the adjustable test parameter, that is, in this injection operation mode, the user can only freely set the injection environment temperature, while other parameters such as the injection flow rate and injection time are fixed, so that in this injection operation mode, the working state of the nozzle under different injection environment temperatures can be tested; another injection operation mode can support adjustment of two adjustable test parameters, such as the injection environment temperature and the injection flow rate can be selected as the adjustable test parameters, that is, in this injection operation mode, the user can only freely set the injection environment temperature and the injection flow rate, and The other parameters such as injection rate and injection time are fixed, so the working state of the nozzle under different injection environment temperatures and different injection flow rates can be tested in this injection operation mode; the last injection operation mode can support the adjustment of three adjustable test parameters, such as the injection environment temperature, the injection flow rate of the urea system and the injection rate of the urea system can be selected as adjustable test parameters, that is, in this injection operation mode, the user can only freely set the injection environment temperature, injection flow rate and injection rate, while other parameters such as injection time are fixed, so the working state of the nozzle under different injection environment temperatures, different injection flow rates and different injection rates can be tested in this injection operation mode. The above is only an example of this application, and there is no specific restriction on the number of types of adjustable test parameters allowed to be adjusted in different injection operation modes.

[0037] In some embodiments, the multiple injection operation modes include at least one or more of a normal temperature operation mode, a high temperature operation mode, a constant flow operation mode, a constant speed operation mode, and a variable speed and variable time cycle operation mode.

[0038] Specifically, the normal temperature operation mode is an injection operation mode in which the injection environment temperature changes with the actual air environment temperature, rather than being freely set by the user. In the normal temperature operation mode, the adjustable test parameters may be one or more of the injection flow rate, injection rate and injection time, so as to test the working state of the urea system under different vehicle operating environments by changing the injection flow rate, injection rate and / or injection time.

[0039] The high temperature operation mode is an injection operation mode in which the injection environment temperature can be freely set. In the high temperature operation mode, the adjustable test parameter is the injection environment temperature, so that the working state of the urea system when the vehicle is running at different ambient temperatures can be tested by changing the injection environment temperature. For example, before the injection test starts, the high temperature operation mode is selected and the set temperature is specified, so that the injection environment temperature at the nozzle of the urea system is heated to the set temperature before injection, thereby realizing the injection test of the urea system under high temperature conditions, wherein the set temperature value can refer to the injection environment temperature at the nozzle when the vehicle is running.

[0040] The fixed flow operation mode is an injection operation mode in which the injection flow rate can be freely set. In the fixed flow operation mode, the adjustable test parameter is the injection flow rate of the urea system, so that the working state of the urea system under different injection flow rates can be tested by changing the injection flow rate. For example, during the injection test, the injection flow rate of the urea system can be set as the target injection flow rate. In the fixed flow operation mode, the injection rate of the urea system is fixed, wherein the target injection flow rate and injection rate can be set according to the actual situation, for example, the target injection flow rate is set to 30g, 50g, and the target injection rate is set to 100mg / s~500mg / s, and no specific restrictions are made here.

[0041] The fixed rate operation mode is an injection operation mode in which the injection rate can be freely set. In the fixed rate operation mode, the adjustable test parameter is the injection rate of the urea system, so that the working state of the urea system at different injection rates can be tested by changing the injection rate. During the injection test, the injection rate and injection time of the urea system can be set according to the actual situation, such as setting the injection time to 4 minutes, 5 minutes, etc., and no specific restrictions are made here. For example, for nozzles that maintain low-speed injection accuracy, the problem can be quickly reproduced by selecting the fixed rate operation mode to set a high injection rate.

[0042] The variable speed variable time cyclic operation mode is an injection operation mode in which both the injection rate and the injection time are not fixed and can be cyclically operated according to a certain period. For the variable speed variable time cyclic operation mode, the injection rate and injection time during fixed cyclic operation can be preset, which can be fixedly set in the form of an injection curve. For example, it can be formed into an injection curve according to the operation mode shown in Table 1, so that when the variable speed variable time cyclic operation mode is selected, the urea system can be controlled according to the parameters shown in Table 1.

[0043] Table 1

[0044] In some embodiments, after controlling the urea system to perform an injection test, the method further includes obtaining actual injection parameters of the urea system under different simulated vehicle operating environments; determining theoretical injection parameters of the urea system under different simulated vehicle operating environments; and determining test results of the urea system under at least one vehicle operating environment based on the actual injection parameters and the theoretical injection parameters.

[0045] Specifically, after the adjustable test parameters are determined, the urea system is controlled to perform injection based on the adjustable test parameters, and the actual injection parameters after injection are collected, and the test results under the current vehicle operating environment are determined by the actual injection parameters and the theoretical injection parameters. Thus, by comparing the actual injection parameters of the urea system under different simulated vehicle operating environments with the theoretical injection parameters of the urea system corresponding to the simulated vehicle operating environment, the test results of the urea system can be determined, so that the injection test of the urea system can be completed with high precision, wherein the theoretical injection parameters are the injection results of the urea system under an ideal state, and the actual injection parameters are used to reflect the nozzle quality, which can be set according to actual conditions. For example, the actual injection parameters can be set to the urea injection weight.

[0046] In some embodiments, the test result of the urea system under at least one vehicle operation environment is determined according to the actual injection parameters and the theoretical injection parameters, including determining the deviation percentage under at least one vehicle operation environment according to the actual injection parameters and the theoretical injection parameters; and using the deviation percentage as the test result of the urea system. This facilitates the subsequent use of the test results under different vehicle operation environments to detect the quality of the urea system and reproduce quality problems.

[0047] Specifically, the deviation percentage under the vehicle operating environment may be determined by referring to Formula 1.

[0048] Deviation percentage = (actual injection value - theoretical injection value) / theoretical injection value × 100% Formula 1 In some embodiments, before controlling the urea system to perform the injection test, the method further includes controlling the urea system to perform an exhaust operation.

[0049] Specifically, before the injection test, in order to avoid the deviation between the test results and the experimental results, it should be ensured that the urea system is completely liquid before and after the experiment. Therefore, before the injection test, the urea system should also be controlled to perform exhaust operation to exhaust the air in the urea pipe. For example, before the injection test, the urea system is controlled to continuously inject 500 mg / s for 20 seconds and perform exhaust operation.

[0050] Reference below Figure 2 The test method of the urea system according to the embodiment of the present invention is illustrated by way of example, and the specific steps are as follows.

[0051] In step S3, the urea system performs exhaust operation.

[0052] Step S4: the target operation mode is the normal temperature operation mode.

[0053] Step S5: the target operation mode is a high temperature operation mode.

[0054] Step S6, heating the spraying environment temperature at the nozzle to a set temperature.

[0055] Step S7: the target operation mode is the constant flow operation mode.

[0056] Step S8: the target operation mode is a constant speed operation mode.

[0057] Step S9: the target operation mode is a variable speed and variable time cycle operation mode.

[0058] Step S10, calculating the deviation percentage.

[0059] Step S11, taking the deviation percentage as the test result of the urea system.

[0060] The second embodiment of the present invention provides a urea system test system 100, such as Figure 3 As shown, the test system 100 of the urea system includes a determination module 10 and a control module 20 .

[0061] The determination module 10 is used to determine adjustable test parameters for simulating the vehicle operation environment; the control module 20 is used to control the urea system to perform injection testing according to the adjustable test parameters.

[0062] According to the test system 100 of the urea system of the embodiment of the present invention, the determination module determines the adjustable test parameters for simulating the whole vehicle operating environment, so that the control module controls the urea system to perform the injection test according to the adjustable test parameters, so as to more accurately test the working state of the urea system under the whole vehicle operating environment, and the injection test has higher accuracy.

[0063] The third embodiment of the present invention provides a urea system testing device 200, such as Figure 4As shown, the test device 200 of the urea system includes a test device 30 and a control device 40 .

[0064] The test device 30 is connected to the urea system 300 to simulate the vehicle operation environment and collect the spray from the urea system. The control device 40 is connected to the test device 30 and the urea system 300 to execute the test method of the urea system of the above embodiment.

[0065] The urea system test device 200 according to the embodiment of the present invention can simulate the whole vehicle operating environment to test the urea system 300, so that the test condition of the urea system is more consistent with the working state under the whole vehicle operating environment, and the test accuracy of the injection test is improved.

[0066] In some embodiments, reference Figure 4 and Figure 5 As shown, the urea system 300 includes a nozzle 50 , and the test device 30 includes a weighing module 1 and a heating module 2 .

[0067] Among them, the weighing module 1 is connected to the nozzle 50 and the control device 40, and the weighing module 1 is used to collect the spray and weigh the spray; the heating module 2 is arranged at the nozzle 50 and connected to the control device 40, and the heating module 2 is used to heat the nozzle 50 to adjust the spray environment temperature at the nozzle 50.

[0068] Specifically, the urea system 300 is provided with a urea pump 60, which delivers the stored urea solution to the nozzle 50 and releases the urea solution through the nozzle 50; the test device 30 calculates the deviation percentage through the calculation module 3; the control device 40 is connected to the urea pump 60 and the nozzle 50 for communication, so that the control device 40 can control the operation of the urea pump 60 and the nozzle 50, and send the theoretical injection parameters to the test device 30, so that the test device 30 can determine the deviation percentage according to the actual injection parameters and the theoretical injection parameters through the calculation module 3.

[0069] Exemplarily, the injection parameter is set to the injection weight, and the control device 40 is set to DCU (Diesel Control Unit, diesel engine control unit). After the DCU obtains the theoretical injection weight, the DCU controls the urea pump 60 and the nozzle 50 to perform the injection operation, and sends the theoretical injection weight to the calculation module 3. After the injection test is completed, the test device obtains the actual injection weight through the weighing module 1, and sends it to the calculation module 3. The calculation module 3 calculates the deviation percentage based on the actual injection weight and the theoretical injection weight, and finally obtains the output injection accuracy. Among them, the heating module 2 can adjust the injection environment temperature at the nozzle 50 according to the set temperature, and maintain the injection environment temperature at the nozzle 50.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0071] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for testing a urea system, characterized in that: include: Determine the adjustable test parameters used to simulate the vehicle operating environment; The urea system is controlled to perform an injection test according to the adjustable test parameters.

2. The method for testing a urea system according to claim 1, characterized in that: The adjustable test parameters include at least one or more of an injection environment temperature of the urea system, an injection flow rate of the urea system, an injection rate of the urea system, and an injection time of the urea system.

3. The method for testing a urea system according to claim 2, characterized in that: The step of determining adjustable test parameters for simulating the vehicle operating environment includes: Configuring multiple injection operation modes, wherein each injection operation mode allows adjustment of at least one adjustable test parameter for simulating the vehicle operation environment; confirming a target injection operation mode from among a plurality of injection operation modes; Adjustable test parameters for simulating the whole vehicle operating environment are determined according to the target injection operating mode.

4. The method for testing a urea system according to claim 3, characterized in that: The multiple injection operation modes include at least one or more of a normal temperature operation mode, a high temperature operation mode, a constant flow operation mode, a constant speed operation mode, and a variable speed and variable time cycle operation mode.

5. The method for testing a urea system according to claim 1, characterized in that: After controlling the urea system to perform the injection test, the method further includes: Acquiring the actual injection parameters of the urea system under different simulated vehicle operation environments; Determining theoretical injection parameters of the urea system under different simulated vehicle operating environments; A test result of the urea system under at least one vehicle operating environment is determined according to the actual injection parameter and the theoretical injection parameter.

6. The method for testing a urea system according to claim 5, characterized in that: Determining a test result of the urea system under at least one vehicle operating environment according to the actual injection parameter and the theoretical injection parameter includes: Determining a deviation percentage under at least one vehicle operating environment according to the actual injection parameter and the theoretical injection parameter; The deviation percentage is taken as the test result of the urea system.

7. The method for testing a urea system according to any one of claims 1 to 6, characterized in that: Before controlling the urea system to perform the injection test, the method further includes: The urea system is controlled to perform exhaust operation.

8. A test system for a urea system, characterized in that: include: A determination module, used to determine adjustable test parameters for simulating the vehicle operating environment; The control module is used to control the urea system to perform an injection test according to the adjustable test parameters.

9. A test device for a urea system, characterized in that: include: A test device, the test device is connected to the urea system and is used to simulate the operating environment of the whole vehicle and collect the spray of the urea system; A control device, wherein the control device is connected to the test device and the urea system, and the control device is used to execute the test method of the urea system according to any one of claims 1 to 7.

10. The test device of the urea system according to claim 9, characterized in that: The urea system comprises a nozzle, and the testing device comprises: A weighing module, the weighing module is connected to the nozzle and the control device, and the weighing module is used to collect the ejected material and weigh the ejected material; A heating module is disposed at the nozzle and connected to the control device, and is used for heating the nozzle to adjust the spraying environment temperature at the nozzle.

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