System and method for controlling water content of engine oil of hydrogen internal combustion engine

Abstract

The invention discloses a method for controlling the water content of engine oil of a hydrogen internal combustion engine, relates to the technical field of hydrogen internal combustion engine control and solves the technical problems that the water content of engine oil is difficult to reduce and the quality of engine oil is difficult to guarantee in time due to lack of an effective strategy for controlling the water content of engine oil by the hydrogen internal combustion engine. Engine oil water content, engine oil temperature, engine oil water net increase rate and cooler front exhaust gas temperature are obtained, and active intervention mode triggering conditions are set; setting a first active intervention mode triggering requirement and a second active intervention mode triggering requirement, and entering a first active intervention mode when the active intervention mode triggering condition meets the first active intervention mode triggering requirement; and when the active intervention mode triggering condition meets the second active intervention mode triggering requirement, entering a second active intervention mode. The invention further discloses a system for controlling the water content of the engine oil of the hydrogen internal combustion engine. The water content of engine oil is effectively controlled, and the service life of engine oil is prolonged.

Description

Technical Field

[0001] This invention relates to the field of hydrogen internal combustion engine control technology, and more specifically, to a control system and method for controlling the water content of engine oil in a hydrogen internal combustion engine. Background Technology

[0002] Hydrogen internal combustion engines, as a new type of clean energy power device, have advantages such as zero carbon emissions and clean combustion products. However, because hydrogen combustion produces a large amount of water vapor, some of this water vapor condenses and mixes into the engine oil during engine operation, causing the oil's water content to continuously increase.

[0003] Currently, the industry widely uses hydrogen-based internal combustion engine lubricating oils to improve the oil's tolerance to moisture. However, in actual use, especially under continuous low-load operating conditions, the oil temperature is low, making it difficult for moisture to evaporate and be discharged. This causes the oil's water content to continuously rise beyond the limit, affecting lubrication performance and potentially leading to serious engine malfunctions.

[0004] Currently, there is a lack of effective active control strategies to reduce the water content of engine oil in a timely manner and ensure engine oil quality. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a control system and method for the water content of engine oil in hydrogen internal combustion engines, thereby solving the technical problem that the lack of an effective strategy for controlling the water content of engine oil in hydrogen internal combustion engines makes it difficult to reduce the water content of engine oil in a timely manner and ensure the quality of engine oil.

[0006] The present invention discloses a method for controlling the water content of engine oil in a hydrogen internal combustion engine. The method comprises: The engine oil water content, engine oil temperature, net increase rate of engine oil water content, and exhaust gas temperature before the cooler are obtained; the active intervention mode triggering conditions are set according to the engine oil water content, engine oil temperature, net increase rate of engine oil water content, and exhaust gas temperature before the cooler. The system sets trigger requirements for a first, second, and third active intervention mode, as well as a trigger requirement for exiting the active intervention mode. When the trigger conditions for the active intervention mode meet the first active intervention mode trigger requirement, the system enters the first active intervention mode; when the trigger conditions for the active intervention mode meet the second active intervention mode trigger requirement, the system enters the second active intervention mode; when the trigger conditions for the active intervention mode meet the third active intervention mode trigger requirement, the system enters the third active intervention mode; and when the trigger conditions for the active intervention mode meet the exit active intervention mode trigger requirement, the system exits the active intervention mode.

[0007] As a further improvement, the triggering requirements for the first active intervention mode are as follows: the net increase rate of oil moisture is greater than zero, the oil water content is greater than the preset safety upper limit value W1, the oil temperature is less than the preset first temperature threshold T1, and the exhaust gas temperature before the cooler is greater than or equal to the preset exhaust gas temperature threshold T. eg .

[0008] Furthermore, the triggering requirements for the second active intervention mode are as follows: the net increase rate of oil moisture is greater than zero, the oil water content is greater than the preset safety upper limit value W1, the oil temperature is less than the first temperature threshold T1, and the exhaust gas temperature before the cooler is less than the exhaust gas temperature threshold T. eg .

[0009] Furthermore, the triggering requirement for the third active intervention mode is that, after entering the second active intervention mode, the water content of the engine oil is greater than the preset second water content threshold W2. The active intervention mode triggering conditions include whether the net increase rate of oil moisture is greater than zero, whether the oil temperature is less than a preset first temperature threshold T1, whether the oil water content is greater than zero, whether the oil water content is greater than a safe upper limit W1, and whether the exhaust gas temperature before the cooler is less than a preset temperature threshold T. eg .

[0010] Furthermore, the first active intervention mode is to set the cooling efficiency of the exhaust gas cooler to a preset first cooling efficiency. After entering the first active intervention mode, a first time threshold t1 and a second water content threshold W2 are set. The continuous operating time of the exhaust gas cooler under the preset minimum cooling efficiency and the water content of the engine oil after entering the first active intervention mode are obtained. It is determined whether the continuous operating time of the exhaust gas cooler under the preset minimum cooling efficiency is greater than the first time threshold t1 and whether the water content of the engine oil is greater than the second water content threshold W2. When the continuous operating time of the exhaust gas cooler under the minimum cooling efficiency is greater than the preset first time threshold t1 or the water content of the engine oil after entering the first active intervention mode is greater than the second water content threshold W2, the second active intervention mode is entered.

[0011] Furthermore, the second active intervention mode is to activate the first active intervention mode, and at the same time set the heating power of the oil heater to a preset first heating power; When the second active intervention mode is entered, a second time threshold t2 is set, the continuous operating time of the oil heater under the maximum heating power is obtained, and it is determined whether the continuous operating time of the oil heater under the maximum heating power is greater than the second time threshold t2; when the continuous operating time of the oil heater under the maximum heating power is greater than the second time threshold t2, the third active intervention mode is entered.

[0012] Furthermore, the third active intervention mode is to enable the first and second active intervention modes while simultaneously executing a low-load-virtual high-load strategy; The execution time of the low-load-virtual-high-load strategy is obtained, a third time threshold t3 is set, and it is determined whether the execution time of the low-load-virtual-high-load strategy is greater than the third time threshold t3. When the execution time of the low-load-virtual-high-load strategy is greater than the preset third time threshold t3, an active intervention timeout alarm for engine oil water content is issued.

[0013] Furthermore, the requirement for exiting the active intervention mode is that, after entering the first active intervention mode, the second active intervention mode, or the third active intervention mode, the oil temperature is greater than the preset second temperature threshold T2. Furthermore, when entering the first active intervention mode, or the second active intervention mode, or the third active intervention mode, it is determined whether the net increase rate of engine oil moisture is less than or equal to zero. When the net increase rate of engine oil moisture is less than or equal to zero, it is determined whether the engine oil water content is equal to the preset safety value; when it is determined that the engine oil water content is equal to the safety value, the active intervention mode is exited. When the net increase rate of engine oil moisture is greater than zero, an oil moisture net increase rate exceeding the standard warning is issued and it is determined whether the engine oil water content is greater than the second water content threshold W2; when it is determined that the engine oil water content is greater than the second water content threshold W2, an oil water content exceeding the standard warning is issued.

[0014] A hydrogen internal combustion engine oil water content control system, the system comprising, An oil temperature sensor is used to acquire the temperature of the oil in the oil pan and output an oil temperature signal. An oil quality sensor is used to acquire the water content of the oil and output the water content signal of the oil. The exhaust gas temperature sensor before cooling is used to acquire the high-temperature exhaust gas temperature at the inlet of the exhaust gas cooler and output the exhaust gas temperature signal. An oil heater is used to heat engine oil. Exhaust gas cooler, used to cool high-temperature exhaust gas; The ECU is used to receive the oil temperature signal, oil water content signal, and exhaust gas temperature signal, and apply the above-mentioned hydrogen internal combustion engine oil water content control method to trigger an active intervention mode based on the oil temperature, oil water content, and exhaust gas temperature to control the oil heater and exhaust gas cooler.

[0015] Beneficial effects The advantages of this invention are: This invention sets active intervention mode trigger conditions based on the obtained oil water content, oil temperature, net increase rate of oil water content, and exhaust gas temperature before the cooler. It sets first, second, and third active intervention mode trigger requirements. When the first active intervention mode trigger condition is met, the system enters the first active intervention mode; when the second active intervention mode trigger condition is met, the system enters the second active intervention mode; when the third active intervention mode trigger condition is met, the system enters the third active intervention mode; and when the exit active intervention mode trigger condition is met, the system exits the active intervention mode. This allows for proactive adjustment when the oil water content is close to the limit and the temperature is insufficient to evaporate the water, increasing the oil temperature to promote water evaporation, thereby effectively controlling the oil water content, extending oil lifespan, and improving engine reliability. Attached Figure Description

[0016] Figure 1 This is a flowchart of the method for controlling the water content of engine oil in a hydrogen internal combustion engine according to the present invention; Figure 2 This is a schematic diagram of the overall system structure of the hydrogen internal combustion engine oil water content control method of the present invention.

[0017] The components are: 1-Intake pipe, 2-Dryer, 3-Oil-gas separator, 4-ECU, 5-Oil temperature sensor, 6-Oil quality sensor, 7-Oil heater, 8-Ignition system, 9-Crankcase, 10-Oil, 11-Oil pan, 12-Exhaust gas chamber at the bottom of oil pan, 13-After-scroll exhaust pipe, 14-High-temperature exhaust gas intake pipe, 15-Exhaust gas temperature sensor before cooling, 16-Exhaust gas cooler, 17-Exhaust gas connection pipe, 18-Exhaust gas temperature sensor at the bottom of oil pan, 19-Exhaust gas return pipe. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention. See Figures 1-2 The present invention provides a method for controlling the water content of engine oil in a hydrogen internal combustion engine, such as... Figure 1 As shown, the method is as follows: S1: Obtain the oil water content, oil temperature, net increase rate of oil water content, and exhaust gas temperature before the cooler; set the trigger conditions for the active intervention mode based on the oil water content, oil temperature, net increase rate of oil water content, and exhaust gas temperature before the cooler.

[0019] S2: The method for obtaining the net increase rate of engine oil water content is to establish a model for the net increase rate of engine oil water content using an existing dynamic model of engine oil water content, and to calculate the net increase rate of engine oil water content in real time. The net increase rate of engine oil water content combines the water production rate (positively correlated with hydrogen flow rate and engine load) and the evaporation rate (positively correlated with engine oil temperature and engine oil surface area) under the current operating conditions.

[0020] The expression for the model of net increase rate of engine oil moisture is as follows: ; in, V The net increase rate of moisture content, k 1 is the basic water production coefficient. f This is the engine correction function, which is a function related to engine speed and load conditions. It was determined through experiments. Q This refers to the amount of hydrogen consumed. k 2 represents the water evaporation coefficient. k 3 represents the oil temperature coefficient, obtained through fitting experimental data; T represents the oil temperature. S This represents the surface area of ​​the oil pan. Q vent The crankcase ventilation flow rate was determined through testing.

[0021] Employing a recursive algorithm with error feedback, the ECU compares the instantaneous rate of change measured by the oil water content sensor with the net increase rate predicted by the model in each control cycle, generating a real-time error signal. This error signal is then used to dynamically fine-tune the model parameters. f (Engine correction function) k 2 (evaporation coefficient) and k 3 (Temperature coefficient).

[0022] The ECU uses reinforcement learning algorithms to optimize strategies in real time. By exploring different actions (such as adjusting heating power) and observing the results (changes in water content), it gradually learns the optimal intervention parameters under different environmental conditions (such as low temperature and high humidity) to make them more in line with the actual characteristics of a specific engine and achieve the best balance between energy consumption and efficiency.

[0023] By introducing a dynamic model of engine oil moisture content, early prediction and intervention of the deterioration trend of water content can be achieved, preventing problems before they occur and improving the precision and reliability of control.

[0024] The active intervention mode trigger conditions include S3: whether the net increase rate of engine oil moisture is greater than zero, and S11: whether the engine oil water content is greater than the preset second water content threshold W. 2， S5: Is the engine oil water content greater than zero? S6: ​​Is the engine oil temperature less than the preset first temperature threshold T1? S7: Is the engine oil water content greater than the safety upper limit W1? S8: Is the exhaust gas temperature before the cooler less than the preset temperature threshold T?eg .

[0025] Set the trigger requirements for the first active intervention mode, the second active intervention mode, the third active intervention mode, and the trigger requirements for exiting the active intervention mode.

[0026] The first active intervention mode is triggered when the net increase rate of engine oil moisture is greater than zero, the engine oil water content is greater than the preset safety upper limit value W1, the engine oil temperature is less than the preset first temperature threshold T1, and the exhaust gas temperature before the cooler is greater than or equal to the preset exhaust gas temperature threshold T. eg .

[0027] When the conditions for triggering the active intervention mode are met, the system enters the first active intervention mode. The first active intervention mode involves setting the cooling efficiency of the exhaust gas cooler to a preset first cooling efficiency.

[0028] S7: Upon entering the first active intervention mode, a first time threshold t1 and a second water content threshold W2 are set. The continuous operating time of the exhaust gas cooler at the preset minimum cooling efficiency and the water content of the engine oil after entering the first active intervention mode are obtained. It is determined whether the continuous operating time of the exhaust gas cooler at the preset minimum cooling efficiency is greater than the first time threshold t1 and whether the water content of the engine oil is greater than the second water content threshold W2. If the continuous operating time of the exhaust gas cooler at the minimum cooling efficiency is greater than the preset first time threshold t1 or the water content of the engine oil after entering the first active intervention mode is greater than the second water content threshold W2, then the second active intervention mode is entered. This avoids localized excessively high engine oil heating temperatures that could lead to rapid oil aging. The exhaust gas cooler needs to have a lower limit threshold for cooling efficiency set. When the ECU adjusts the cooling efficiency, it is gradually adjusted from high to low, and controlled in a closed loop by parameters such as the exhaust gas temperature before cooling, the exhaust gas temperature at the bottom of the oil pan, the engine oil temperature, and the engine oil water content.

[0029] S8 and S9: When the triggering conditions for the active intervention mode meet the triggering requirements for the second active intervention mode, the second active intervention mode is entered. The triggering requirements for the second active intervention mode are: the net increase rate of oil moisture is greater than zero, the oil water content is greater than the preset safety upper limit value W1, the oil temperature is less than the first temperature threshold T1, and the exhaust gas temperature before the cooler is less than the exhaust gas temperature threshold T. eg .

[0030] S10: The second active intervention mode activates the first active intervention mode while simultaneously setting the oil heater's heating power to the preset first heating power. The second active intervention mode is a coordinated active intervention mode. Setting the second active intervention mode can prevent localized excessively high oil heating temperatures from causing rapid oil aging. The heating power needs to be adjusted slowly from low to high and controlled in a closed loop by oil temperature and oil water content.

[0031] S12: When entering the second active intervention mode, set the second time threshold t2, obtain the continuous running time of the oil heater under the maximum heating power, and determine whether the continuous running time of the oil heater under the maximum heating power is greater than the second time threshold t2; when the continuous running time of the oil heater under the maximum heating power is greater than the second time threshold t2, then enter the third active intervention mode.

[0032] When the conditions for triggering the active intervention mode meet the requirements for triggering the third active intervention mode, the third active intervention mode is entered. The requirements for triggering the third active intervention mode are that, after entering the second active intervention mode, the water content of the engine oil is greater than the preset second water content threshold W2.

[0033] S13: The third active intervention mode is to activate the first and second active intervention modes and simultaneously execute the low load-virtual high load strategy. The low load-virtual high load strategy is to obtain the engine's operating load. When the engine's operating load is low, the throttle is fully opened, the hydrogen injection phase is moved back to the preset target injection phase, and the ignition angle is delayed to the preset target ignition angle, thereby increasing the exhaust temperature and the engine temperature, which is conducive to the overall evaporation of water in the engine oil.

[0034] By employing dynamic temperature range and time window control targets, and combining an adjustable exhaust gas cooler, an adjustable oil heater, and engine control strategies, a triple guarantee for oil water content safety is constructed. The ECU's closed-loop regulation of the heating temperature avoids the risk of rapid oil aging caused by localized excessive oil temperature, making the control process more precise and efficient.

[0035] S14: Obtain the execution time of the low load - virtual high load strategy, set the third time threshold t3, and determine whether the execution time of the low load - virtual high load strategy is greater than the third time threshold t3; when the execution time of the low load - virtual high load strategy is greater than the preset third time threshold t3, S15: issue an alarm for active intervention timeout of engine oil water content.

[0036] S17: When entering the first active intervention mode, the second active intervention mode, or the third active intervention mode, determine whether the net increase rate of engine oil water is less than or equal to zero.

[0037] S21: When the net increase rate of engine oil moisture is less than or equal to zero, determine whether the engine oil water content is equal to the preset safety value; when the engine oil water content is determined to be equal to the safety value, exit the active intervention mode.

[0038] S18: When the net increase rate of engine oil moisture is greater than zero, an oil moisture net increase rate exceeding the standard warning is issued and it is determined whether the engine oil water content is greater than the second water content threshold W2; S19: When it is determined that the engine oil water content is greater than the second water content threshold W2, S20: an oil water content exceeding the standard warning is issued.

[0039] When the conditions for triggering the active intervention mode are met, and the requirements for exiting the active intervention mode are also met, the active intervention mode will be exited.

[0040] S16: The requirement for exiting the active intervention mode is that after entering the first active intervention mode, the second active intervention mode, or the third active intervention mode, the oil temperature is greater than the preset second temperature threshold T2.

[0041] The adaptive learning function of the method of the present invention enables the system to continuously optimize itself as it is used, maintaining good control performance in different environments and driving styles, and thus extending the technology life cycle.

[0042] like Figure 2 As shown, a hydrogen internal combustion engine oil water content control system includes, The oil temperature sensor 5 is installed in the oil pan 11 to obtain the oil temperature in the oil pan 11 and output the oil temperature signal.

[0043] The oil quality sensor 6 is installed in the oil pan 11 to acquire the water content of the oil and output the water content signal of the oil.

[0044] The exhaust gas temperature sensor 15 is installed at the inlet of the exhaust gas cooler 16 to obtain the temperature of the high-temperature exhaust gas at the inlet of the exhaust gas cooler and output the exhaust gas temperature signal.

[0045] The oil heater 7 is used to heat the engine oil. It is built into the oil pan 11 and is a heater with controllable power to heat the engine oil when needed.

[0046] The exhaust gas cooler 16 is used to cool high-temperature exhaust gas and its cooling efficiency can be adjusted.

[0047] ECU4 is used to receive oil temperature signal, oil water content signal and exhaust gas temperature signal, and apply the above-mentioned hydrogen internal combustion engine oil water content control method to trigger an active intervention mode based on oil temperature, oil water content and exhaust gas temperature to control oil heater 7 and exhaust gas cooler 16.

[0048] The system also includes, Intake pipe 1 is the engine intake pipe.

[0049] Dryer 2 is installed downstream of oil-gas separator 3 in crankcase ventilation system and is used to absorb moisture in the gas in crankcase 9.

[0050] Oil-gas separator 3, a core component of the engine crankcase ventilation system, is used to separate oil mist from the gas in the crankcase 9.

[0051] Ignition system 8, engine ignition system, is a system that is precisely controlled by ECU4 to ignite the air-fuel mixture and convert chemical energy into mechanical energy.

[0052] Crankcase 9 is a sealed working chamber in the lower half of the engine block.

[0053] Engine oil 10 is stored in the oil pan 11 and is used for engine lubrication, friction reduction, cooling, etc.

[0054] Oil pan 11 is a component at the bottom of the engine that stores engine oil.

[0055] The exhaust gas chamber 12 at the bottom of the oil pan is integrated into the gas chamber on the lower side of the oil pan 11 and is used to introduce cooled exhaust gas to heat the engine oil in the oil pan.

[0056] The exhaust pipe 13 is the exhaust gas connection pipe after the turbocharger and before the catalytic converter of the engine. It contains high-temperature exhaust gas discharged from the engine.

[0057] The high-temperature exhaust gas intake pipe 14 is used to transport high-temperature exhaust gas from the vortex-following pipe to the exhaust gas cooler 16.

[0058] The exhaust gas pipe 17 is used to transport the cooled exhaust gas to the exhaust gas chamber at the bottom of the oil pan 11.

[0059] The oil pan exhaust gas temperature sensor 18 is installed in the exhaust gas cavity at the bottom of the oil pan to monitor the exhaust gas temperature at the bottom of the oil pan 11 in real time.

[0060] The exhaust gas return pipe 19 is used to transport the exhaust gas in the bottom cavity of the oil pan 11 back to the exhaust pipe 13.

[0061] This invention constructs a multimodal, adaptive, and collaborative control system. It deeply integrates exhaust gas heat energy reuse, oil heating devices, and engine operating strategies with the unique operating conditions of hydrogen internal combustion engines (especially the characteristics of water production during combustion) to achieve predictive and forward-looking moisture control.

[0062] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A method for controlling the water content of engine oil in a hydrogen internal combustion engine, characterized in that, The method is as follows: The engine oil water content, engine oil temperature, net increase rate of engine oil water content, and exhaust gas temperature before the cooler are obtained; the active intervention mode triggering conditions are set according to the engine oil water content, engine oil temperature, net increase rate of engine oil water content, and exhaust gas temperature before the cooler. The system sets the trigger requirements for the first active intervention mode, the second active intervention mode, the third active intervention mode, and the exit active intervention mode. When the active intervention mode trigger conditions meet the first active intervention mode trigger requirements, the system enters the first active intervention mode. When the triggering conditions of the active intervention mode meet the triggering requirements of the second active intervention mode, the second active intervention mode is entered. When the triggering conditions of the active intervention mode meet the triggering requirements of the third active intervention mode, the third active intervention mode is entered. When the triggering conditions of the active intervention mode are met, the active intervention mode is exited.

2. The method for controlling the water content of engine oil in a hydrogen internal combustion engine according to claim 1, characterized in that, The first active intervention mode is triggered when the net increase rate of oil moisture is greater than zero, the oil water content is greater than the preset safety upper limit value W1, the oil temperature is less than the preset first temperature threshold T1, and the exhaust gas temperature before the cooler is greater than or equal to the preset exhaust gas temperature threshold T. eg .

3. The method for controlling the water content of engine oil in a hydrogen internal combustion engine according to claim 2, characterized in that, The second active intervention mode is triggered when the net increase rate of oil moisture is greater than zero, the oil water content is greater than the preset safety upper limit value W1, the oil temperature is less than the first temperature threshold T1, and the exhaust gas temperature before the cooler is less than the exhaust gas temperature threshold T. eg .

4. The method for controlling the water content of engine oil in a hydrogen internal combustion engine according to claim 1, characterized in that, The triggering requirement for the third active intervention mode is that, after entering the second active intervention mode, the water content of the engine oil is greater than the preset second water content threshold W2. The active intervention mode triggering conditions include whether the net increase rate of oil moisture is greater than zero, whether the oil temperature is less than a preset first temperature threshold T1, whether the oil water content is greater than zero, whether the oil water content is greater than a safe upper limit W1, and whether the exhaust gas temperature before the cooler is less than a preset temperature threshold T. eg .

5. The method for controlling the water content of engine oil in a hydrogen internal combustion engine according to claim 1, characterized in that, The requirement for exiting the active intervention mode is that, after entering the first active intervention mode, the second active intervention mode, or the third active intervention mode, the oil temperature is greater than the preset second temperature threshold T2.

6. The method for controlling the water content of engine oil in a hydrogen internal combustion engine according to claim 1, characterized in that, The first active intervention mode is to set the cooling efficiency of the exhaust gas cooler to a preset first cooling efficiency; After entering the first active intervention mode, a first time threshold t1 and a second water content threshold W2 are set. The continuous operating time of the exhaust gas cooler under the preset minimum cooling efficiency and the water content of the engine oil after entering the first active intervention mode are obtained. It is determined whether the continuous operating time of the exhaust gas cooler under the preset minimum cooling efficiency is greater than the first time threshold t1 and whether the water content of the engine oil is greater than the second water content threshold W2. When the continuous operating time of the exhaust gas cooler under the minimum cooling efficiency is greater than the preset first time threshold t1 or the water content of the engine oil after entering the first active intervention mode is greater than the second water content threshold W2, the second active intervention mode is entered.

7. The method for controlling the water content of engine oil in a hydrogen internal combustion engine according to claim 6, characterized in that, The second active intervention mode is to activate the first active intervention mode and simultaneously set the heating power of the oil heater to a preset first heating power; After entering the second active intervention mode, a second time threshold t2 is set, the continuous operating time of the oil heater under the maximum heating power is obtained, and it is determined whether the continuous operating time of the oil heater under the maximum heating power is greater than the second time threshold t2; when the continuous operating time of the oil heater under the maximum heating power is greater than the second time threshold t2, the third active intervention mode is entered.

8. The method for controlling the water content of engine oil in a hydrogen internal combustion engine according to claim 6, characterized in that, The third active intervention mode is to enable the first and second active intervention modes, and simultaneously execute the low-load-virtual high-load strategy; The execution time of the low-load-virtual-high-load strategy is obtained, a third time threshold t3 is set, and it is determined whether the execution time of the low-load-virtual-high-load strategy is greater than the third time threshold t3. When the execution time of the low-load-virtual-high-load strategy is greater than the third time threshold t3, an active intervention timeout alarm for engine oil water content is issued.

9. The method for controlling the water content of engine oil in a hydrogen internal combustion engine according to claim 1, characterized in that, When entering the first active intervention mode, or the second active intervention mode, or the third active intervention mode, determine whether the net increase rate of engine oil moisture is less than or equal to zero. When the net increase rate of engine oil moisture is less than or equal to zero, it is determined whether the engine oil water content is equal to the preset safety value; when it is determined that the engine oil water content is equal to the safety value, the active intervention mode is exited. When the net increase rate of engine oil moisture is greater than zero, an oil moisture net increase rate exceeding the standard warning is issued and it is determined whether the engine oil water content is greater than the preset second water content threshold W2; when it is determined that the engine oil water content is greater than the second water content threshold W2, an oil water content exceeding the standard warning is issued.

10. A control system for the water content of engine oil in a hydrogen internal combustion engine, characterized in that, The system includes, The oil temperature sensor (5) is used to obtain the oil temperature in the oil pan (11) and output the oil temperature signal; An oil quality sensor (6) is used to acquire the water content of the oil and output the water content signal of the oil. The exhaust gas temperature sensor (15) before cooling is used to obtain the high temperature of the exhaust gas at the inlet of the exhaust gas cooler and output the exhaust gas temperature signal. Oil heater (7) is used to heat the oil; Exhaust gas cooler (16) is used to cool high-temperature exhaust gas; ECU (4) is used to receive the oil temperature signal, oil water content signal and exhaust gas temperature signal and apply the oil water content control method of any one of claims 1-9 to trigger an active intervention mode based on the oil temperature, oil water content and exhaust gas temperature to control the oil heater (7) and exhaust gas cooler (16).

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