Test method and system for evaluating demulsification performance of methanol engine lubricating oil

Abstract

The invention relates to the technical field of engines, in particular to a test method and system for evaluating the demulsification performance of methanol engine lubricating oil, and the method comprises the following steps: selecting a methanol engine of a target model as a test engine, transforming an oil pan, and filling test lubricating oil to be tested into the methanol engine after transformation, the method comprises the following steps: establishing a demulsibility test cycle working condition of to-be-tested lubricating oil, testing a methanol engine by using the demulsibility test cycle working condition, collecting lubricating oil samples in an oil pan before and after the methanol engine is tested, and determining the demulsibility of the to-be-tested lubricating oil according to analysis results of the oil samples before and after the test. Therefore, the problem that a bench test evaluation method for the demulsification performance of the methanol engine lubricating oil is lacked is solved, and the method has the advantages of high evaluation repeatability, short period, low cost and the like.

Description

Technical Field

[0001] The present application relates to the technical field of methanol engines, and in particular to a test method and system for evaluating the anti-emulsification performance of methanol engine lubricating oil. Background Art

[0002] Low-carbonization and zero-carbonization of fuels are the main paths for the internal combustion engine industry to achieve the strategic goal of "carbon neutrality". Green methanol (CH3OH) is one of the important carbon-neutral fuels; methanol engines have developed rapidly in my country and are currently widely used in passenger cars, commercial vehicles, generator sets and other power sources.

[0003] The fuel characteristics of methanol will have many effects on the performance of lubricants during use. Among them, one of the main challenges of methanol engine lubricants is the easy emulsification of lubricants. Compared with gasoline, diesel and other fuels, methanol has a high hydrogen content, with a mass fraction of 12.5%. The water content in the combustion products is high. If the water cannot be discharged in time, it can accumulate in the lubricant through the tortuosity system, thereby causing the lubricant to emulsify. In severe cases, it can lead to increased wear, lubrication failure, engine damage, etc., affecting the reliability and safe operation of the engine. Therefore, the anti-emulsification performance of methanol engine lubricants is an important factor in whether they can operate reliably, and they need to be specially assessed and evaluated.

[0004] The evaluation indicators of lubricant anti-emulsification performance mainly include the emulsification stability, water content and viscosity change of the oil. At present, there is no test and evaluation method for the anti-emulsification performance of methanol engine lubricant based on the engine bench. It is impossible to accurately evaluate the lubricant's ability to resist emulsification in the working environment of the methanol engine, which is not conducive to the research and development, matching and test evaluation of methanol engine lubricant products. Summary of the invention

[0005] The present application provides a test method and system for evaluating the anti-emulsification performance of methanol engine lubricating oil, so as to solve the problem of lack of bench test evaluation method for the anti-emulsification performance of methanol engine lubricating oil in related technologies.

[0006] The first aspect of the present application provides a test method for evaluating the anti-emulsification performance of a methanol engine lubricant, comprising: selecting a target model of a methanol engine as a test engine; removing the oil pan of the methanol engine, modifying the oil pan, reinstalling the modified oil pan on the methanol engine, and connecting the modified oil pan to various target components; filling the methanol engine with a test lubricant to be tested, selecting the boundary conditions of the test room, establishing an anti-emulsification test cycle for the lubricant to be tested, and testing the methanol engine using the anti-emulsification test cycle; collecting lubricant oil samples in the oil pan before and after the methanol engine test, generating test results based on reference indicators and the lubricant oil samples, and analyzing the anti-emulsification performance of the lubricant to be tested based on the test results.

[0007] Optionally, the oil pan is modified, including: drilling holes and welding an oil guide tube at the lowest position and target liquid level position of the oil pan, respectively, and drilling holes and welding a temperature sensor base at a target position of the oil pan.

[0008] Optionally, each target component includes a heat exchanger, a coolant inlet pipeline, a coolant outlet pipeline, an electric proportional valve, an oil pump, a temperature sensor and a test bench control system, and the modified oil pan is connected to each target component, including: using an oil pipe to connect the oil guide pipe of the oil pan to the heat exchanger, installing an oil pump in the lubricating oil pipeline between the oil pan and the heat exchanger, and connecting the other two interfaces of the heat exchanger to the coolant inlet pipeline and the coolant outlet pipeline with pipelines; installing an electric proportional valve in the coolant outlet pipeline, and connecting the coolant outlet pipeline to the oil pump to ensure that the pipeline pressure is less than a preset pressure, installing a temperature sensor on the temperature sensor base, and communicating it to the test bench control system to monitor the oil temperature in the oil pan in real time, and communicating the electric proportional valve to the test bench control system to adjust the valve opening in time to achieve oil temperature control.

[0009] Optionally, an anti-emulsification test cycle condition for the lubricant to be tested is established, including: selecting multiple candidate operating conditions for a methanol engine; selecting multiple candidate operating temperatures for the lubricant, testing the oil water content of the multiple candidate operating conditions at the multiple candidate operating temperatures, determining a target test condition from the multiple candidate operating conditions based on the oil water content and selecting a target operating temperature from the multiple candidate operating temperatures, and selecting a target operating time for each condition in the test cycle condition based on a safety threshold of the oil water content; and establishing an anti-emulsification test cycle condition for the lubricant to be tested based on the target test condition, target operating temperature and target operating time.

[0010] Optionally, the plurality of candidate operating conditions include 20%, 60% and 100% load of the methanol engine at 50%, 80% and 100% rated speed, respectively.

[0011] Optionally, the plurality of candidate operating temperatures includes 20%, 60%, and 100% of the actual maximum lubricating oil temperature.

[0012] Optionally, the test cycle conditions include rapid water melting conditions, slow water melting conditions, high temperature water removal conditions and shutdown conditions, wherein the rapid water melting conditions, slow water melting conditions, high temperature water removal conditions and shutdown conditions all include the percentage of rated speed, load percentage, operating time, oil operating temperature and transition time.

[0013] Optionally, the test results include kinematic viscosity at 100°C, water content and emulsion stability state, and the boundary conditions include temperature at 25±5°C and relative humidity at 50±5%.

[0014] Optionally, when modifying the oil pan, wipe out the residual lubricating oil in the oil pan.

[0015] The second embodiment of the present application provides a test system for evaluating the anti-emulsification performance of methanol engine lubricating oil, comprising: a methanol engine of a target model, a heat exchanger, a coolant inlet pipeline, a coolant outlet pipeline, an electric proportional valve, an oil pump, a temperature sensor, a bench control system and an offline analysis device, wherein the methanol engine is installed with a modified oil pan, holes are drilled and oil guide pipes are welded at the lowest position and the target liquid level position of the modified oil pan, and a temperature sensor base is drilled and welded at the target position of the oil pan; the oil guide pipe of the oil pan is connected to the heat exchanger by using an oil pipe, an oil pump is installed in the lubricating oil pipeline between the oil pan and the heat exchanger, and the other two interfaces of the heat exchanger are connected to the coolant inlet pipeline and the coolant outlet pipeline by pipelines; an electric proportional valve is installed in the coolant outlet pipeline For example, a valve is installed, the coolant outlet pipe is connected to the oil pump to ensure that the pipe pressure is less than the preset pressure, the temperature sensor is installed on the temperature sensor base, and communicates to the test bench control system to monitor the oil temperature in the oil pan in real time, and the electric proportional valve is communicated to the test bench control system to adjust the valve opening in time to achieve oil temperature control; the methanol engine is filled with the test lubricant to be tested, the boundary conditions of the test room are selected, the anti-emulsification test cycle conditions of the test lubricant to be tested are established, the target model of methanol engine is tested using the anti-emulsification test cycle conditions, and the lubricant oil samples in the oil pan of the target model of methanol engine before and after the test are collected; offline analysis equipment is used to generate test results based on reference indicators and lubricant oil samples, and analyze the anti-emulsification performance of the test lubricant to be tested based on the test results.

[0016] Therefore, this application includes the following beneficial effects:

[0017] (1) The testing system for the anti-emulsification performance of lubricating oil in the embodiment of the present application can increase the water content of the methanol engine lubricating oil in a short period of time to achieve the purpose of rapid emulsification of the engine oil, shorten the test cycle, and significantly reduce the evaluation cost; the engine oil operating temperature can be accurately controlled by modifying the oil pan external oil cooling device, effectively ensuring the repeatability and accuracy of the test.

[0018] (2) The embodiment of the present application can accurately simulate the operating conditions and environment of the methanol engine on the engine test bench, and truly evaluate the anti-emulsification performance of the methanol engine lubricant. Through the preliminary combination screening of the common engine operating conditions, oil operating temperature and operating time, a test cycle condition is established, which can simulate the actual application scenarios of the methanol engine lubricant to the greatest extent and more truly reflect the advantages and disadvantages of the anti-emulsification performance of the methanol engine lubricant.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A flow chart of a test method for evaluating the anti-emulsification performance of methanol engine lubricating oil provided according to an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of a test system for evaluating the anti-emulsification performance of methanol engine lubricating oil according to an embodiment of the present application.

[0023] Explanation of the reference numerals: target model methanol engine 1, oil pump 2, temperature sensor 3, heat exchanger 4, electric proportional valve 5, test bench control system 6, coolant inlet pipeline 7, coolant outlet pipeline 8, off-line analysis equipment 9, test system for evaluating the anti-emulsification performance of methanol engine lubricating oil 10. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0025] The following describes the test method and system for evaluating the demulsification performance of methanol engine lubricating oil according to the embodiment of the present application with reference to the accompanying drawings. Specifically, Figure 1 It is a flow chart of a test method for evaluating the anti-emulsification performance of a methanol engine lubricating oil according to an embodiment of the present application.

[0026] like Figure 1 As shown, the test method for evaluating the demulsification performance of methanol engine lubricating oil includes the following steps:

[0027] In step S101, a target model of methanol engine is selected as a test engine.

[0028] It is understandable that the embodiment of the present application can select a target model of methanol engine as the test engine, so as to facilitate subsequent testing of the target model of methanol engine. The target model can be selected according to the test requirements and is not specifically limited.

[0029] In step S102, the oil pan of the methanol engine is removed, the oil pan is modified, the modified oil pan is reinstalled on the methanol engine, and the modified oil pan is connected to each target component.

[0030] Among them, the target components include heat exchanger, coolant inlet pipeline, coolant outlet pipeline, electric proportional valve, oil pump, temperature sensor and test bench control system.

[0031] In an embodiment of the present application, the oil pan is modified, including: drilling holes and welding oil guide pipes at the lowest position and target liquid level position of the oil pan, respectively, and drilling holes and welding a temperature sensor base at the target position of the oil pan; and when modifying the oil pan, wiping off the original residual lubricating oil in the oil pan.

[0032] In the embodiment of the present application, the modified oil pan is connected to each target component, including: using an oil pipe to connect the oil guide pipe of the oil pan to the heat exchanger, installing an oil pump in the lubricating oil pipeline between the oil pan and the heat exchanger, and connecting the other two interfaces of the heat exchanger to the coolant inlet pipeline and the coolant outlet pipeline with pipelines; installing an electric proportional valve in the coolant outlet pipeline, and the coolant outlet pipeline is connected to the oil pump to ensure that the pipeline pressure is less than the preset pressure, installing a temperature sensor on the temperature sensor base, and communicating it to the test bench control system to monitor the oil temperature in the oil pan in real time, and communicating the electric proportional valve to the test bench control system to adjust the valve opening in time to achieve oil temperature control.

[0033] It is understandable that the embodiment of the present application can drill holes and weld oil guide pipes at the lowest position and target liquid level position of the oil pan, and the lubricating oil can be drawn out of the oil pan and heat exchanged through an external heat exchanger, thereby achieving precise control of the lubricating oil temperature, and can quickly increase the water content of the lubricating oil during the test, accelerate the production of oil emulsification, and shorten the test cycle; drill holes and weld the temperature sensor base at the target position of the oil pan, and the actual operating temperature of the lubricating oil in the oil pan can be monitored in real time. The data of the temperature sensor is connected to the test bench control system through communication, so that the control system can adjust the opening of the electric proportional valve according to the actual temperature, further accurately control the lubricating oil temperature, and improve the repeatability and accuracy of the test.

[0034] Specifically, the embodiment of the present application can connect the two oil guide pipes of the oil pan to the heat exchanger through the oil pipe, ensuring that the lubricating oil can flow into and out of the heat exchanger smoothly; the function of the heat exchanger is to accurately control the temperature of the lubricating oil through heat exchange with the laboratory refrigerant, which can ensure that the lubricating oil temperature remains within the set range during the test, simulating actual working conditions.

[0035] The data from the temperature sensor is transmitted to the test bench control system through the communication line. The control system adjusts the opening of the electric proportional valve according to the real-time temperature data, thereby achieving precise control of the lubricating oil temperature. An oil pump is installed in the lubricating oil pipeline to ensure that the lubricating oil can circulate continuously, which helps to evenly distribute heat, improve heat exchange efficiency, and speed up the adjustment of the lubricating oil temperature. It is installed in the coolant outlet pipeline to adjust the pipeline pressure to ensure that the pipeline pressure does not exceed the preset value to prevent equipment damage or leakage due to excessive pressure.

[0036] An oil pump is connected between the coolant outlet pipes. When the main pipe pressure exceeds the preset value, the oil pump can divert part of the coolant to further ensure that the pipe pressure is within a safe range. Precise temperature control can ensure the consistency of test conditions, make the test results more reliable and accurate, shorten the test cycle, and ensure the safety of the test.

[0037] In step S103, the test lubricant to be tested is added to the methanol engine, the boundary conditions of the test room are selected, the anti-emulsification test cycle conditions of the test lubricant to be tested are established, and the target model of methanol engine is tested using the anti-emulsification test cycle conditions.

[0038] The boundary conditions include temperature at 25±5°C and relative humidity at 50±5%.

[0039] It is understandable that the embodiments of the present application can improve the repeatability and reliability of the test by maintaining the consistency of the lubricating oil level and ensuring the same initial conditions for each test. Controlling the boundary conditions of the laboratory and setting up an anti-emulsification test cycle to conduct the test can ensure the repeatability and accuracy of the test, comprehensively evaluate the anti-emulsification performance of the lubricating oil, shorten the test cycle, ensure the safety of the test, and facilitate data analysis and result interpretation.

[0040] In an embodiment of the present application, an anti-emulsification test cycle condition for the lubricant to be tested is established, including: selecting multiple candidate conditions of a target model of a methanol engine; selecting multiple candidate operating temperatures of the lubricant, testing the oil water content of the multiple candidate conditions at the multiple candidate operating temperatures, determining a target test condition from the multiple candidate conditions and selecting a target operating temperature from the multiple candidate operating temperatures according to the oil water content, and selecting a target operating time for each condition in the test cycle condition according to a safety threshold of the oil water content; and establishing an anti-emulsification test cycle condition for the lubricant to be tested according to the target test condition, target operating temperature and target operating time.

[0041] Among them, multiple candidate operating conditions include 20%, 60% and 100% load of the target model methanol engine at 50%, 80% and 100% rated speed respectively; multiple candidate operating temperatures include 20%, 60% and 100% of the actual maximum lubricating oil temperature. The safety threshold can be specifically calibrated, such as taking 3% water content in the engine oil as the safety limit.

[0042] It can be understood that the embodiments of the present application can select multiple candidate operating conditions and candidate operating temperatures of the target model of methanol engine, test the water content of the engine oil, determine the target test conditions, target operating temperature and target operating time, and finally build an anti-emulsification test cycle condition, which can ensure the representativeness, repeatability and accuracy of the test, shorten the test cycle, and ensure the safety of the test.

[0043] For example, the embodiment of the present application takes 9 working conditions as an example. The working condition with the fastest oil water generation among the 9 working conditions can be selected as the test condition. The test content is the water content in the oil under different engine running time. In order to avoid damage to the engine due to excessive water content and severe emulsification of the lubricating oil, the oil water content of 3% is used as a safety limit, and the running time when the oil water content is 3% is set as the running time of each condition of the subsequent test cycle condition.

[0044] Specifically, (1) candidate operating conditions: The commonly used operating conditions of methanol engines are used as candidate operating conditions for the test cycle conditions, and a total of 9 operating conditions of 20%, 60% and 100% load at 50%, 80% and 100% rated speed of the engine are selected as candidate operating conditions, as shown in Table 1, where Table 1 is a table of candidate operating conditions for the test cycle conditions.

[0045] Table 1

[0046]

[0047] (2) Lubricating oil operating temperature

[0048] The lubricating oil temperature during engine operation is precisely controlled by the modified oil pan external lubricating oil cooling device. The lubricating oil operating temperature is controlled to 20%, 60% and 100% of the actual maximum lubricating oil temperature, and the change in the oil water content of the above 9 candidate operating conditions is tested to select the appropriate oil operating temperature.

[0049] In the embodiment of the present application, the principle of establishing the test cycle conditions is that the cycle conditions are close to the actual application scenarios of the engine oil. The test cycle conditions include fast water melting conditions, slow water melting conditions, high-temperature water removal conditions and shutdown conditions. Among them, the fast water melting conditions, slow water melting conditions, high-temperature water removal conditions and shutdown conditions all include the percentage of rated speed, load percentage, operating time, engine oil operating temperature and transition time.

[0050] Specifically, the principle of establishing the cycle condition is that the cycle condition is as close as possible to the actual application scenario of the engine oil, which mainly includes four parts: fast water melting condition, slow water melting condition, high temperature water removal condition and shutdown condition. According to the above test cycle condition screening scheme, the test cycle condition is obtained, as shown in Table 2, where Table 2 is a table of cycle conditions for lubricating oil anti-emulsification test.

[0051] Table 2

[0052]

[0053]

[0054] In step S104, lubricating oil samples in the oil pan of the target model of methanol engine before and after the test are collected, test results are generated according to reference indicators and the lubricating oil samples, and the anti-emulsification performance of the lubricating oil to be tested is analyzed according to the test results.

[0055] Among them, the analysis results before and after the test include 100°C kinematic viscosity, water content and emulsion stability state, and the reference indicators are the methanol engine lubricating oil detection indicators.

[0056] It can be understood that the embodiment of the present application can collect oil samples before and after the test of the oil pan of the target model of methanol engine, generate pre- and post-test analysis results based on reference indicators and the oil samples before and after the test, determine the anti-emulsification performance of the lubricating oil to be tested based on the pre- and post-test analysis results, comprehensively evaluate the performance of the lubricating oil, and achieve a true and accurate evaluation of its anti-emulsification performance.

[0057] It should be noted that, after running multiple test cycles according to test requirements or enterprise regulations, the embodiment of the present application can collect oil samples through the oil pan for offline physical and chemical testing, and detect the emulsion stability, water content and viscosity change of the oil by comparing with the corresponding analysis methods. The analysis methods of each index are shown in Table 3, where Table 3 is an analysis method table of the detection indexes of methanol engine lubricating oil.

[0058] Table 3

[0059]

[0060] According to the test method for evaluating the anti-emulsification performance of methanol engine lubricating oil proposed in the embodiment of the present application, by adopting the modification of the external lubricating oil temperature control device, the precise control of the oil operating temperature when the engine is running can be achieved, which can increase the oil water content and produce oil emulsification in a short time, and greatly shorten the time for oil emulsification compared with the normal operating conditions of the engine; through the preliminary combination screening of the common engine operating conditions, oil operating temperature and operating time, the oil anti-emulsification test cycle conditions are established, which restores the actual application scenarios of methanol engine lubricating oil to the greatest extent, and realizes the true and accurate evaluation of its anti-emulsification performance.

[0061] The test method for evaluating the demulsification performance of the methanol engine lubricating oil of the present application will be further described below with a specific example, and the specific steps are as follows:

[0062] Step 1: Select a certain type of methanol engine as a test engine. The selection principle may be: an engine with a large market share, wide application, and a highly representative technical route.

[0063] Step 2: Use the above oil pan external oil cooling device modification scheme to modify the oil pan, wipe off the original residual lubricating oil in the oil pan, and follow the Figure 2 Connect the components as shown.

[0064] Step 3: Add new test lubricant to ensure that the lubricant level meets the company's requirements.

[0065] Step 4: Confirm the engine boundary conditions. During the engine operation, the temperature in the test room is controlled at 25±5℃ and the relative humidity is controlled at 50±5%. According to GB 17692-2024 "Net Power Test Method for Automotive Engines and Drive Motors" and the company's requirements, the engine boundary conditions are adjusted and confirmed at the rated engine point.

[0066] Step 5, confirming the test cycle conditions, according to the above test cycle condition screening scheme, the test cycle conditions are obtained, as shown in Table 2.

[0067] Each of the above cycles lasts for a total of 100 minutes, and continuous operation for 60 cycles totals 100 hours. Before the start of each test cycle, an initial oil sample of 250 ml is collected through the oil pan. After all test cycles are completed, a final oil sample of 250 ml is collected through the oil pan, and then physical and chemical testing and analysis of the oil are carried out.

[0068] Step 6, physical and chemical testing and analysis of anti-emulsification index, physical and chemical testing and analysis of the oil samples before and after the test are performed according to the above Table 1, and the test results are shown in Table 4, wherein Table 4 is a table of physical and chemical analysis results.

[0069] Table 4

[0070] Serial number index Post-test analysis results Pre-test analysis results 1 <![CDATA[Kinematic viscosity at 100℃ / mm 2 / s]]> 11.23 11.63 2 Water content / mg / kg 4000 947 3 Emulsion stability / mL-mL-state 5-0-Pure water 5-3-Pure water

[0071] In summary, the present application can realize precise control of the oil operating temperature when the engine is running by using an external lubricating oil temperature control device; it can increase the oil water content and produce oil emulsification in a short time, which greatly shortens the time for oil emulsification compared with normal engine operating conditions; through the preliminary combination screening of common engine operating conditions, oil operating temperature and operating time, an oil anti-emulsification test cycle condition is established, which restores the actual application scenario of methanol engine lubricating oil to the greatest extent, and realizes the true and accurate evaluation of its anti-emulsification performance.

[0072] Figure 2 It is a schematic diagram of a test system for evaluating the anti-emulsification performance of a methanol engine lubricating oil according to an embodiment of the present application.

[0073] like Figure 2 As shown, the test system 10 for evaluating the anti-emulsification performance of methanol engine lubricating oil includes: a methanol engine 1 of a target model, an oil pump 2, a temperature sensor 3, a heat exchanger 4, an electric proportional valve 5, a bench control system 6, a coolant inlet pipeline 7, a coolant outlet pipeline 8 and an offline analysis device 9.

[0074] Among them, the target model methanol engine is installed with a modified oil pan. The modification process includes: drilling holes and welding oil guide pipes at the lowest position of the oil pan and the target liquid level position of the lubricating oil, drilling holes and welding the temperature sensor base at the target position of the oil pan; using oil pipes to connect the two newly opened oil guide pipes of the oil pan to the heat exchanger, and installing an oil pump in the lubricating oil pipeline to ensure that the lubricating oil can circulate, and the other two interfaces of the heat exchanger are connected to the coolant inlet pipeline with pipelines, and an electric proportional valve is installed in the pipeline. An oil pump is connected between the coolant outlet pipeline to ensure that the pipeline pressure is less than the preset pressure, and the temperature sensor is installed to the temperature sensor. The base is configured to communicate with the test bench control system to monitor the oil temperature in the oil pan in real time, and the electric proportional valve is communicated to the test bench control system to adjust the valve opening in time to achieve oil temperature control; the methanol engine is filled with the test lubricating oil to be tested, the boundary conditions of the test room are selected, the anti-emulsification test cycle conditions of the test lubricating oil to be tested are established, the target model of methanol engine is tested using the anti-emulsification test cycle conditions, and the lubricating oil samples in the oil pan of the target model of methanol engine before and after the test are collected; the offline analysis equipment is used to generate test results based on reference indicators and lubricating oil samples, and analyze the anti-emulsification performance of the test lubricating oil to be tested based on the test results.

[0075] According to the test system for evaluating the anti-emulsification performance of methanol engine lubricating oil proposed in the embodiment of the present application, the precise control of the oil operating temperature when the engine is running is achieved by adopting an external lubricating oil temperature control device; the water content of the oil can be increased in a short time and the oil emulsification can be generated, which greatly shortens the time for the oil emulsification to occur compared with the normal operating conditions of the engine; through the preliminary combination screening of the common engine operating conditions, the oil operating temperature and the operating time, the oil anti-emulsification test cycle conditions are established, which restores the actual application scenarios of the methanol engine lubricating oil to the greatest extent, and realizes the true and accurate evaluation of its anti-emulsification performance.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0078] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0079] It should be understood that the various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, the steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0080] A person of ordinary skill in the art may understand that all or part of the steps carried by the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the above-mentioned program may be stored in a computer-readable storage medium, which, when executed, includes one of the steps of the method embodiment or a combination thereof.

[0081] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A test method for evaluating the demulsification performance of methanol engine lubricating oil, characterized in that: The following steps are involved: Select the target model of methanol engine as the test engine; The oil pan of the methanol engine is removed, the oil pan is modified, the modified oil pan is reinstalled on the methanol engine, and the modified oil pan is connected to each target component; Filling the methanol engine with the test lubricant to be tested, selecting the boundary conditions of the test chamber, building an anti-emulsification test cycle condition for the test lubricant to be tested, and testing the methanol engine using the anti-emulsification test cycle condition; The lubricating oil samples in the oil pan before and after the methanol engine test are collected, the test results are generated according to the reference index and the lubricating oil samples, and the anti-emulsification performance of the lubricating oil to be tested is analyzed according to the test results.

2. The test method for evaluating the demulsification performance of methanol engine lubricating oil according to claim 1, characterized in that: The transformation of the oil pan includes: Drill holes and weld oil guide pipes at the lowest position and target liquid level position of the oil pan, and drill holes and weld a temperature sensor base at the target position of the oil pan.

3. The test method for evaluating the demulsification performance of methanol engine lubricating oil according to claim 2, characterized in that: The target components include a heat exchanger, a coolant inlet pipe, a coolant outlet pipe, an electric proportional valve, an oil pump, a temperature sensor and a bench control system. The modified oil pan is connected to the target components, including: Use an oil pipe to connect the oil guide pipe of the oil pan to the heat exchanger, install an oil pump in the lubricating oil pipeline between the oil pan and the heat exchanger, and connect the other two interfaces of the heat exchanger to the coolant inlet pipeline and the coolant outlet pipeline with pipelines; An electric proportional valve is installed in the coolant outlet pipeline, and the coolant outlet pipeline is connected to an oil pump to ensure that the pipeline pressure is less than a preset pressure. A temperature sensor is installed on the temperature sensor base and communicates to the bench control system to monitor the oil temperature in the oil pan in real time. The electric proportional valve is communicated to the bench control system to adjust the valve opening in time to achieve oil temperature control.

4. The test method for evaluating the demulsification performance of methanol engine lubricating oil according to claim 1, characterized in that: The construction of the anti-emulsification test cycle of the lubricating oil to be tested comprises: selecting a plurality of candidate operating conditions of the methanol engine; Selecting a plurality of candidate operating temperatures of the lubricating oil, testing the oil water content of the plurality of candidate operating conditions at the plurality of candidate operating temperatures, determining a target test operating condition from the plurality of candidate operating conditions according to the oil water content and selecting a target operating temperature from the plurality of candidate operating temperatures, and selecting a target operating time for each operating condition in the test cycle operating condition according to a safety threshold of the oil water content; The anti-emulsification test cycle condition of the lubricating oil to be tested is established according to the target test condition, the target operating temperature and the target running time.

5. The test method for evaluating the demulsification performance of methanol engine lubricating oil according to claim 4, characterized in that: The plurality of candidate operating conditions include 20%, 60% and 100% load of the methanol engine at 50%, 80% and 100% rated speed, respectively.

6. The test method for evaluating the demulsification performance of methanol engine lubricating oil according to claim 4, characterized in that: The plurality of candidate operating temperatures include 20%, 60%, and 100% of the actual maximum lubricating oil temperature.

7. The test method for evaluating the demulsification performance of methanol engine lubricating oil according to claim 1, characterized in that: The test cycle conditions include fast water melting conditions, slow water melting conditions, high temperature water removal conditions and shutdown conditions, wherein the fast water melting conditions, the slow water melting conditions, the high temperature water removal conditions and the shutdown conditions all include the percentage of rated speed, load percentage, operating time, oil operating temperature and transition time.

8. The test method for evaluating the demulsification performance of methanol engine lubricating oil according to claim 1, characterized in that: The test results include kinematic viscosity at 100° C., water content and emulsion stability state, and the boundary conditions include temperature at 25±5° C. and relative humidity at 50±5%.

9. The test method for evaluating the demulsification performance of methanol engine lubricating oil according to claim 1, characterized in that: When the oil pan is modified, the residual lubricating oil in the oil pan is wiped clean.

10. A test system for evaluating the anti-emulsification performance of methanol engine lubricating oil, characterized in that: include: Target model methanol engine, heat exchanger, coolant inlet pipe, coolant outlet pipe, electric proportional valve, oil pump, temperature sensor, bench control system and offline analysis equipment, including: The methanol engine is equipped with a modified oil pan, holes are drilled and oil guide pipes are welded at the lowest position and target liquid level position of the modified oil pan, and a temperature sensor base is drilled and welded at the target position of the oil pan; Use an oil pipe to connect the oil guide pipe of the oil pan to the heat exchanger, install an oil pump in the lubricating oil pipeline between the oil pan and the heat exchanger, and connect the other two interfaces of the heat exchanger to the coolant inlet pipeline and the coolant outlet pipeline with pipelines; An electric proportional valve is installed in the coolant outlet pipeline, and the coolant outlet pipeline is connected to an oil pump to ensure that the pipeline pressure is less than a preset pressure. A temperature sensor is installed on the temperature sensor base and communicated to the bench control system to monitor the oil temperature in the oil pan in real time. The electric proportional valve is communicated to the bench control system to adjust the valve opening in time to achieve oil temperature control; Filling the methanol engine with the test lubricant to be tested, selecting the boundary conditions of the test chamber, building an anti-emulsification test cycle condition for the test lubricant to be tested, testing the methanol engine using the anti-emulsification test cycle condition, and collecting lubricant oil samples in the oil pan of the methanol engine before and after the test; The off-line analysis device is used to generate a test result according to a reference index and the lubricating oil sample, and analyze the anti-emulsification performance of the lubricating oil to be tested according to the test result.

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