Experimental device and method for simulating accelerated aging of lubricating oil of hydrogen fuel internal combustion engine under action of high-temperature water vapor

Abstract

The invention discloses an experimental device and method for simulating accelerated aging of lubricating oil of a hydrogen fuel internal combustion engine under the action of high-temperature water vapor, belongs to the technical field of lubricating material testing and analysis, and is characterized in that a set of adjustable high-temperature water vapor generating system is constructed; high-temperature water vapor is continuously introduced into lubricating oil of a fresh hydrogen fuel internal combustion engine, so that the aging effect of water vapor generated in the combustion process of the hydrogen fuel internal combustion engine on the lubricating oil after entering a crankcase of the internal combustion engine is accelerated and simulated. The equipment is composed of a water vapor generation module, an aging test module and a parameter control module, and core parameters such as temperature, pressure and flow of water vapor can be adjusted. The device and the method provide a reliable accelerated aging oil sample preparation means for deeply researching the oil oxidation level, additive consumption, tribological performance degradation and the like of the lubricating oil of the hydrogen fuel internal combustion engine under the working condition of high-temperature water vapor.

Description

Technical Field

[0001] This invention belongs to the field of lubricating material testing and analysis technology, specifically relating to an experimental apparatus and method for simulating the accelerated aging of lubricating oil in hydrogen fuel internal combustion engines under the action of high-temperature water vapor. Background Technology

[0002] Hydrogen fuel, as a promising alternative to fossil fuels, has shown application potential in heavy-duty transportation and public transportation due to its rapid refueling capability. However, under the unique operating conditions of hydrogen fuel cell internal combustion engines, lubricating oil faces a more demanding working environment. The moisture generated during hydrogen combustion exists primarily as high-temperature steam. This steam enters the lubricating oil through piston ring gaps, crankcase ventilation systems, and other pathways, causing a series of problems such as oil emulsification, hydrolysis and consumption of additives in the oil, and accelerated wear of the engine's friction pairs. Therefore, lubricating oils for hydrogen fuel cell internal combustion engines must possess excellent resistance to steam aging, which is currently a major challenge in the development of such oils.

[0003] Current methods for evaluating the impact of moisture on lubricating oil in hydrogen fuel cell internal combustion engines primarily involve directly adding a certain amount of liquid water to the lubricating oil, stirring, and then preparing an emulsified oil sample. This emulsified oil sample is then used to assess oil-water separation characteristics or to evaluate the physicochemical, rheological, and tribological properties of the emulsified oil sample. However, the mechanism by which liquid emulsified water affects lubricating oil in internal combustion engines is fundamentally different from the continuous action of water vapor in the operating environment of hydrogen fuel cell internal combustion engines. For simulating and evaluating the aging effects of water vapor on lubricating oil in hydrogen fuel cell internal combustion engines, existing aging devices typically spray lubricating oil in a mist form into a reaction chamber, where it comes into contact with water vapor. However, the form of the mist-sprayed lubricating oil differs significantly from that of the lubricating oil in the crankcase of an internal combustion engine, and it is difficult to precisely control the temperature of the lubricating oil in the atomized state. Furthermore, existing technologies typically require aging times ranging from 24 to 96 hours, resulting in low efficiency. Existing aging devices cannot efficiently simulate the impact of moisture on lubricating oil in hydrogen fuel cell internal combustion engines during operation, especially regarding the physicochemical interactions between water vapor and lubricating oil when the crankshaft rotates and agitates the oil under high-temperature conditions. This limits research into the aging and performance degradation mechanisms of lubricating oil under the influence of moisture, and consequently significantly restricts the research, development, and widespread application of lubricating oils specifically designed for hydrogen fuel cell internal combustion engines. Therefore, there is an urgent need to develop experimental devices and methods capable of simulating the high-temperature and water vapor environment of hydrogen fuel cell internal combustion engines to accelerate lubricating oil aging. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] An experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor includes: a water vapor generating module, a lubricating oil aging test module, and a parameter control module; the water vapor generating module is connected to the lubricating oil aging test module through a second delivery pipeline; the parameter control module is connected to the water vapor generating module and the lubricating oil aging test module through a signal line.

[0006] An experimental method for simulating accelerated aging of lubricating oil in a hydrogen fuel cell internal combustion engine under the action of high-temperature water vapor, using the experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel cell internal combustion engine under the action of high-temperature water vapor, comprising:

[0007] Step 1: Take an appropriate amount of fresh oil sample to be tested, and test the physicochemical and lubrication properties of the fresh oil sample to obtain the initial reference values ​​of the physicochemical and lubrication properties of the fresh oil sample.

[0008] Step 2: Prepare and inspect the experimental setup for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under high-temperature steam: Clean the inside of the water tank, the gas tank, and the aging test chamber and their internal structures using petroleum ether and anhydrous ethanol; dry the inside of the water tank, gas tank, and aging test chamber to evaporate any residual moisture; check all sealing parts to confirm that the first and second sealing rings are intact; add deionized water to the water tank to the specified level; turn on the main power supply of the system for preheating.

[0009] Step 3: Set the experimental parameters through the computer control panel, including steam temperature, steam flow rate, internal pressure of the aging test chamber, stirring shaft speed, aging time and sampling interval; put the fresh oil sample into the aging test chamber, seal the aging test chamber and check its airtightness; start the steam generation module and the lubricating oil aging test module, gradually increase the temperature and pressure to the set working conditions, and start the aging experiment.

[0010] Step 4: During the aging process, oil samples are collected at set time points through the sampling valve. Each sampling obtains multiple parallel samples from different oil locations. The samples are then tested and analyzed immediately after sampling.

[0011] The present invention has the following beneficial effects:

[0012] (1) This invention achieves uniform mixing by directly introducing water vapor into the lubricating oil sample of a hydrogen fuel internal combustion engine and using a built-in porous distribution plate to simulate the crankshaft rotation of an actual hydrogen fuel engine to agitate the lubricating oil. This invention simulates the interaction between high-temperature water vapor and lubricating oil in the crankcase of a hydrogen fuel internal combustion engine, avoiding the technical problems of operating condition mismatch and lubricating oil aging simulation distortion caused by directly adding liquid water or atomized oil.

[0013] (2) By precisely controlling parameters such as water vapor temperature, pressure, flow rate and lubricating oil temperature, the present invention can achieve the aging effect equivalent to an 80-hour bench test within 2 hours, shortening the aging cycle from several days in the prior art to several hours, and improving efficiency by more than 95%; it solves the technical problems of the prior art having an excessively long aging cycle (24-96 hours), low efficiency and difficulty in accurately controlling key parameters. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor, according to the present invention. In the diagram, 1-water tank, 2-liquid level sensor, 3-automatic water replenishment device, 4-1-first electric heating element, 4-2-second electric heating element, 4-3-third electric heating element, 5-support, 6-1-first delivery pipeline, 6-2-second delivery pipeline, 7-gas storage tank, 8-explosion-proof plate, 9-1-first support base, 9-2-second support base, 10-safety valve, 11-flow rate. 12-Mass flow meter, 13-1-First temperature controller, 13-2-Second temperature controller, 14-Electric regulating valve, 15-Aging test chamber, 16-Water vapor distributor, 17-Coupling, 18-Motor output shaft, 19-Drive motor, 20-Motor base, 21-Stirring shaft, 22-Stirring blade, 23-Observation window, 24-Aging test device housing, 25-Sampling valve, 26-1-First sealing ring, 26-2-Second sealing ring, 27-Pressure sensor;

[0015] Figure 2 The figure shows a comparison of the growth capacity of zinc dialkyl dithiophosphate friction film between a hydrogen fuel internal combustion engine bench-aged oil sample obtained by micro-traction force testing machine after 72 hours of bench aging and an oil sample simulated by aging device of the present invention after 2 hours of aging. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0017] like Figure 1 As shown, the present invention provides an experimental device for simulating the accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor, including a water vapor generating module, a lubricating oil aging test module, and a parameter control module; the water vapor generating module is connected to the lubricating oil aging test module through a second delivery pipeline 6-2; the parameter control module is connected to the water vapor generating module and the lubricating oil aging test module through a signal line.

[0018] The steam generating module includes a water tank 1, a first electric heating element 4-1, a second electric heating element 4-2, a first sealing ring 26-1, a gas storage tank 7, and a first delivery pipeline 6-1. The water tank 1 is equipped with a level sensor 2 and an automatic water replenishment device 3, which is connected to the water tank 1. The first and second electric heating elements 4-1 and 4-2 adopt a multi-segment electric heating element structure and are respectively installed at the bottom of the water tank 1 and the gas storage tank 7. The gas storage tank 7 has a dual protection structure of a safety valve 10 and an explosion-proof disc 8. The safety valve 10 is installed at the top of the gas storage tank 7, and the explosion-proof disc 8 is arranged around the circumference of the gas storage tank 7. The first sealing ring 26-1 is made of high-temperature resistant rubber and is installed in a sealing groove at the top of the water tank 1. The first delivery pipeline 6-1 is made of stainless steel corrugated pipe and covered with an insulation layer, connecting the water tank 1 and the gas storage tank 7. The first delivery pipeline 6-1 is connected to the inlet of the gas storage tank 7 via a quick-connect clamp. The second delivery pipeline 6-2 connects the outlet of the gas storage tank 7 to the inlet of the aging test chamber 15.

[0019] The lubricating oil aging test module includes an aging test chamber 15, a stirrer, and a second sealing ring 26-2. The aging test chamber 15 is a cylindrical structure made of heat-resistant stainless steel, with multiple threaded interfaces on its top cover. The stirrer includes stirring blades 22, a stirring shaft 21, and a steam distributor 16; the steam distributor 16 is equipped with a perforated distribution plate and is threadedly fastened to the stirring blades 22. The second sealing ring 26-2 is made of high-temperature resistant rubber and is installed in a sealing groove at the top of the aging test chamber 15. A third electric heating tube 4-3 is installed at the bottom of the aging test chamber 15, and the third electric heating tube 4-3 adopts a multi-segment electric heating tube structure. A sampling valve 25 is located at the top of the aging test chamber 15 and is used to extract representative oil samples from different depths within the aging test chamber 15 at different aging time points during the test for subsequent physicochemical and tribological property analysis. The sampling valve 25 is equipped with a vertically lifting sampling tube and a micro peristaltic pump. When the sampling port of the sampling tube reaches the target depth, the micro peristaltic pump is activated, and the oil sample at a specific depth can be drawn through the sampling tube into an external sample bottle.

[0020] The parameter control module includes a temperature control unit, a pressure control unit, a flow control unit, and a speed control unit. The temperature control unit includes a first temperature controller 13-1 and a second temperature controller 13-2, respectively located at the top of the water tank 1 and the aging test chamber 15. Their temperature sensing elements are immersed at half the depth of the water tank 1 and half the depth of the aging test chamber 15, respectively. Together with the first electric heating tube 4-1, the second electric heating tube 4-2, and the third electric heating tube 4-3, they form the temperature control unit, precisely controlling the temperature of the steam generation module and the lubricating oil aging test module. The pressure control unit includes an electric regulating valve 14 and a pressure sensor 27, both installed at the top of the aging test chamber 15, enabling precise control of the internal pressure of the aging test chamber 15. The flow control unit includes a flow control valve 11 and a mass flow meter 12, both installed on the second delivery pipeline 6-2, used to accurately measure and control the mass flow rate of steam entering the aging test chamber 15, ensuring that the amount of steam entering the lubricating oil aging test module per unit time remains constant and meets the set value during the aging experiment. The speed control unit includes a drive motor 19 and a host computer. The drive motor 19 drives the motor output shaft 18 to be connected to the stirring shaft 21 through a coupling 17, thereby achieving precise control of the speed of the stirring shaft 21. The temperature control unit, pressure control unit, flow control unit, and speed control unit can all be centrally controlled by the host computer using PID intelligent control (a method that combines proportional, integral, and derivative feedback control algorithms to achieve precise, stable, and rapid control of temperature, pressure, flow rate, and speed).

[0021] The bases of the water storage tank 1, the aging test chamber 15, and the gas storage tank 7 are each equipped with an installation platform. The water storage tank 1 is fixed to the installation platform by a bracket 5. The gas storage tank 7 and the aging test chamber 15 are fixed to the installation platform by a first support 9-1 and a second support 9-2, respectively. The outer shell 24 of the aging test device adopts a double-layer heat insulation structure arranged around the aging test chamber 15. The double-layer heat insulation structure can effectively block heat transfer and ensure stable temperature control inside the aging test chamber 15. An observation window 23 is provided on the side of the outer shell 24 of the aging test device. The drive motor 19 is fixed to the bottom of the aging test chamber 15 by a motor mount 20.

[0022] The working principle of the experimental device for simulating accelerated aging of hydrogen fuel internal combustion engine lubricating oil under the action of high-temperature water vapor of the present invention is as follows: the computer and parameter control module drive the first electric heating tube 4-1, the second electric heating tube 4-2, and the third electric heating tube 4-3 to work, converting the deionized water in the water storage tank 1 into high-temperature water vapor and storing it in the gas storage tank 7; through the synergistic action of the mass flow meter 12 and the flow control valve 11, the water vapor with a stable flow rate and pressure is transported to the aging test chamber 15 through the delivery pipeline; at the same time, the computer and parameter control module control the drive motor 19 to drive the stirring shaft 21 and the water vapor distributor 16 to rotate at a constant speed to ensure that the water vapor and the lubricating oil sample are fully mixed; the second sealing ring 26-2 ensures the long-term sealing of the aging test chamber 15 under high temperature and high pressure.

[0023] This invention provides an experimental method for simulating accelerated aging of lubricating oil in hydrogen fuel internal combustion engines under the action of high-temperature water vapor, comprising:

[0024] Step 1: Take an appropriate amount of fresh oil sample to be tested and test its physicochemical and lubrication properties (including the viscosity, acid value, alkalinity, and water content of the new oil, as well as tribological properties including the coefficient of friction, wear volume, and friction film formation ability). Obtain the initial reference values ​​of the physicochemical and lubrication properties of the fresh oil sample (the oil sample before accelerated aging in subsequent steps) for comparison and analysis with the performance parameters of the aged oil sample obtained in Step 4.

[0025] Step 2: Prepare and inspect the experimental apparatus for simulating accelerated aging of hydrogen fuel internal combustion engine lubricating oil under high-temperature steam: Clean the inside of water tank 1, gas tank 7, and aging test chamber 15 and its internal structure with petroleum ether and anhydrous ethanol; dry the inside of water tank 1, gas tank 7, and aging test chamber 15 to evaporate residual moisture; check all sealing parts to confirm that the first sealing ring 26-1 and the second sealing ring 26-2 are intact; add deionized water to water tank 1 to the specified level; turn on the main power supply of the system for preheating.

[0026] Step 3: Set the experimental parameters via the computer control panel, including steam temperature, steam flow rate, internal pressure of the aging test chamber 15, stirring shaft speed 21, aging time, and sampling interval. Load a fresh oil sample into the aging test chamber 15, seal the chamber, and check its airtightness. Start the steam generation module and lubricating oil aging test module, gradually increasing the temperature and pressure to the set operating conditions to begin the aging experiment.

[0027] Step 4: During the aging process, oil samples are collected at set time points using sampling valve 25. Multiple parallel samples should be obtained from different oil locations each time. Immediately after sampling, the performance parameters of the fresh oil sample and the aged oil sample from Step 1 are compared and analyzed: viscosity, moisture content, and tribological properties are analyzed on the corresponding testing machine.

[0028] Figure 2 The results show a comparison of the zinc dialkyl dithiophosphate (ZDDP) friction film growth capabilities of oil samples aged for 72 hours on a hydrogen fuel cell internal combustion engine bench, obtained using a micro traction tester (MTM2), and oil samples aged for 2 hours using the aging apparatus of this invention. The results are presented in the form of optical interference images. Specifically, the fresh oil sample refers to the lubricating oil in its original state without any aging treatment, serving as a blank control group in this experiment; the 72-hour bench-aged oil sample is an aged oil sample obtained after 72 hours of running-in on a bench that more closely resembles the actual operating conditions of a hydrogen fuel cell internal combustion engine, representing the state of an actual hydrogen fuel cell internal combustion engine after use; the 2-hour simulated aging oil sample is an aged oil sample obtained after 2 hours of treatment using the experimental apparatus of this invention that simulates accelerated aging of hydrogen fuel cell internal combustion engine lubricating oil under simulated high-temperature steam, representing the laboratory simulated aging state. The ZDDP friction film growth capability of the three types of oil samples characterizes the anti-wear ability of the oil in its fresh state, after actual bench aging, and after laboratory simulated aging, respectively. The ZDDP friction film growth capability is measured using a dedicated steel ball-steel disc sliding friction tester. The ZDDP friction film is glassy and transparent. The thickness of the friction film on the surface of the steel ball sample was measured using optical interference. Experimental data shows that compared to fresh oil samples, the optical interference images of the friction films formed by both aged oil samples are significantly lighter in color, indicating that both aged oil samples experienced film thinning. The thickness of both aged oil samples eventually stabilized at around 25 nm, with similar steady-state film thicknesses, which can be confirmed by the similar colors of the interference images. This verification result confirms that the film thickness evolution law and steady-state value of the two aged oil samples show good consistency. The aging device of this invention can effectively reproduce the influence of actual operating conditions of hydrogen fuel internal combustion engines on the lubricating performance of lubricating oil. By precisely controlling the contact conditions and reaction environment between water vapor and lubricating oil, this aging device achieves accelerated simulation of the lubricating oil aging process, providing a reliable experimental platform for preparing aged oil samples for studying the performance evolution mechanism of lubricating oil under high-temperature water vapor conditions.

[0029] The above description is merely an embodiment of the present invention and does not limit the scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related system fields, are similarly included within the protection scope of the present invention.

[0030] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. An experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor, characterized in that, include: Steam generation module, lubricating oil aging test module, parameter control module; The steam generating module is connected to the lubricating oil aging test module via a second delivery pipeline; the parameter control module is connected to the steam generating module and the lubricating oil aging test module via a signal line.

2. The experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor as described in claim 1, characterized in that, The steam generating module includes a water storage tank, a first electric heating tube, a second electric heating tube, a first sealing ring, a gas storage tank, and a first delivery pipeline; The water tank is equipped with a level sensor and an automatic water replenishment device, which is connected to the water tank. The first and second electric heating tubes adopt a multi-segment electric heating tube structure and are respectively installed at the bottom of the water tank and the gas tank. The gas tank is equipped with a dual protection structure of a safety valve and an explosion-proof plate. The safety valve is installed at the top of the gas tank, and the explosion-proof plate is arranged around the circumference of the gas tank. The first sealing ring is installed in the sealing groove at the top of the water tank. The first delivery pipeline connects the water tank and the gas tank, and the first delivery pipeline is connected to the inlet of the gas tank through a quick-release clamp. The second delivery pipeline connects the outlet of the gas tank and the inlet of the aging test chamber.

3. The experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor as described in claim 2, characterized in that, The lubricating oil aging test module includes an aging test chamber, a stirrer, and a second sealing ring. The aging test chamber has a cylindrical structure. The stirrer includes stirring blades, a stirring shaft, and a steam distributor. The steam distributor is equipped with a perforated distribution plate and is threaded onto the stirring blades. The second sealing ring is installed in a sealing groove at the top of the aging test chamber. A third electric heating tube is installed at the bottom of the aging test chamber.

4. The experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor as described in claim 3, characterized in that, The first, second, and third electric heating tubes all adopt a multi-segment electric heating tube structure.

5. The experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor as described in claim 3, characterized in that, The parameter control module includes a temperature control unit, a pressure control unit, a flow control unit, and a speed control unit; The temperature control unit includes a first temperature controller and a second temperature controller, which are respectively located on the top of the water tank and the top of the aging test chamber. Together with the first electric heating tube, the second electric heating tube and the third electric heating tube, they form a temperature control unit to precisely control the temperature of the water vapor generation module and the lubricating oil aging test module. The pressure control unit includes an electric regulating valve and a pressure sensor, both of which are installed on the top of the aging test chamber to achieve precise control of the internal pressure of the aging test chamber. The flow control unit includes a flow control valve and a mass flow meter, both installed on the second delivery pipeline, for accurately measuring and controlling the mass flow rate of water vapor leading to the aging test chamber; The speed control unit includes a drive motor and a host computer. The drive motor drives the motor output shaft to be connected to the stirring shaft through a coupling, thereby achieving precise control of the stirring shaft speed.

6. The experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor as described in claim 5, characterized in that, The temperature control unit, pressure control unit, flow control unit, and speed control unit are all centrally controlled by a host computer using PID intelligent control.

7. The experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor according to any one of claims 2 to 6, characterized in that, The bases of the water storage tank, aging test chamber, and gas storage tank are each equipped with an installation platform. The water storage tank is fixed to the installation platform by a bracket, and the gas storage tank and aging test chamber are fixed to the installation platform by a first support and a second support, respectively.

8. The experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor according to any one of claims 2 to 6, characterized in that, The outer shell of the aging test device adopts a double-layer heat insulation structure arranged around the circumference of the aging test chamber, and an observation window is provided on the side of the outer shell of the aging test device.

9. An experimental method for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor, used in the experimental apparatus for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under the action of high-temperature water vapor as described in any one of claims 3 to 8, characterized in that, include: Step 1: Take an appropriate amount of fresh oil sample to be tested, and test the physicochemical and lubrication properties of the fresh oil sample to obtain the initial reference values ​​of the physicochemical and lubrication properties of the fresh oil sample, which will be used to compare and analyze with the performance parameters of the aged oil sample obtained in Step 4. Step 2: Prepare and inspect the experimental setup for simulating accelerated aging of lubricating oil in a hydrogen fuel internal combustion engine under high-temperature steam: Clean the inside of the water tank, the gas tank, and the aging test chamber and their internal structures using petroleum ether and anhydrous ethanol; dry the inside of the water tank, gas tank, and aging test chamber to evaporate any residual moisture; check all sealing parts to confirm that the first and second sealing rings are intact; add deionized water to the water tank to the specified level; turn on the main power supply of the system for preheating. Step 3: Set the experimental parameters through the computer control panel, including steam temperature, steam flow rate, internal pressure of the aging test chamber, stirring shaft speed, aging time and sampling interval; put the fresh oil sample into the aging test chamber, seal the aging test chamber and check its airtightness. Start the steam generation module and the lubricating oil aging test module, gradually increase the temperature and pressure to the set operating conditions, and begin the aging test; Step 4: During the aging process, oil samples are collected at set time points using a sampling valve to obtain aged oil samples. Multiple parallel samples are obtained from different oil locations during sampling. After sampling, the performance parameters of the fresh oil sample to be tested in Step 1 and the aged oil sample are compared and analyzed.

10. The experimental method for accelerating the aging of lubricating oil in a hydrogen fuel internal combustion engine under simulated high-temperature water vapor as described in claim 9, characterized in that, In step 1, the physicochemical and lubricating properties of the fresh oil sample include the physicochemical properties of the new oil such as viscosity, acid value, alkalinity, and water content, as well as the tribological properties such as coefficient of friction, wear volume, and friction film formation ability.

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