Hydrogen engine crankcase hydrogen concentration control method, system and electronic device

Abstract

The application discloses a hydrogen engine crankcase hydrogen concentration control method, and relates to the field of hydrogen engines, which comprises the following steps: placing a hydrogen engine on a test bench to test, obtaining a target hydrogen concentration, an actually measured hydrogen concentration and a crankcase blow-by amount; calculating a target working condition supplementary air amount according to the target hydrogen concentration, the actually measured hydrogen concentration and the crankcase blow-by amount; generating a full working condition supplementary air amount database according to the target working condition supplementary air amount, based on the rotating speed and the load of different working conditions; obtaining the fresh air amount required to be supplemented by a current target working condition according to the full working condition supplementary air amount database; obtaining an intake air pressure, an intake air temperature and a crankcase pressure; combining the intake air pressure, the intake air temperature and the crankcase pressure to calculate a throttle opening degree; comparing the hydrogen concentration measured by a hydrogen concentration sensor according to the current target working condition with the target hydrogen concentration to obtain a hydrogen concentration deviation; generating a corrected fresh air amount; and performing closed-loop control on the actual crankcase hydrogen concentration by adjusting the throttle opening degree.

Description

Technical Field

[0001] This relates to the field of hydrogen engines, specifically a method for controlling hydrogen concentration in the crankcase of a hydrogen engine, a control system for hydrogen concentration in the crankcase of a hydrogen engine, electronic equipment, and a storage medium. Background Technology

[0002] Hydrogen energy, as an energy source conducive to achieving "zero-carbon" development, is an important pathway to technological leadership in the "dual-carbon" era. Hydrogen engines, as a hydrogen energy utilization carrier in the transportation sector, have gained worldwide attention in recent years due to their low cost and rapid commercialization. Because hydrogen engines retain most of the structure of traditional engines, such as the cylinder block, piston, and piston rings, a certain amount of crankcase blow-by gas is generated during combustion, containing a certain amount of hydrogen. Hydrogen has a wide explosive limit range; when the volume concentration of hydrogen in air exceeds 4.0%, there is a risk of explosion. To ensure the safety of hydrogen engine operation, measures need to be taken to reduce the hydrogen content in crankcase blow-by gas. Currently, the mainstream approach is to install air intake ports on the engine cylinder head cover and add an electric motor to the traditional engine's oil-gas separator to draw fresh air into the crankcase to dilute the blow-by gas and reduce the hydrogen concentration.

[0003] For example, a Chinese patent, titled "A Crankcase Ventilation System, Engine, and Hydrogen Concentration Control Method for a Hydrogen Internal Combustion Engine," application number CN119531991A, describes a crankcase ventilation system for a hydrogen internal combustion engine. This system includes a crankcase, a measuring unit, a gas injection unit, a ventilation unit, and a control device. The crankcase includes an air inlet and an exhaust outlet. The measuring unit is located within the crankcase. The gas injection unit includes a gas injection pump connected to the air inlet. The ventilation unit includes an oxidation catalyst and a ventilation pump connected in sequence. The oxidation catalyst is connected to the exhaust outlet and a temperature control device. The control device is electrically connected to the measuring unit, the gas injection pump, the ventilation pump, and the temperature control device. This application achieves effective control of the hydrogen concentration in the crankcase by real-time monitoring of the hydrogen concentration and pressure within the crankcase and adjusting the gas injection pump, ventilation pump, and temperature control device based on the measurement results.

[0004] For example, a Chinese patent, titled "A Ventilation System for an Engine, a Control Method for the Ventilation System of an Engine, and a Vehicle," application number CN119412196A, includes: a pressure sensor disposed in the crankcase; a fan and a first hydrogen concentration sensor both disposed in a first branch; and an adsorption element disposed in a second branch for adsorbing hydrogen gas. One end of the first branch is adapted to connect to the crankcase, and the other end of the first branch is connected to both the second and third branches. The first branch is selectively connected to either the second or third branch. The second and third branches are connected in parallel and are both adapted to connect to the intake manifold. Therefore, when the pressure inside the crankcase is too high, the fan can extract the gas from the crankcase. Furthermore, the first and second branches can be connected to reduce the hydrogen concentration of the gas through the adsorption element, thereby reducing the probability of explosions or combustion due to excessive hydrogen gas in the crankcase, which is beneficial to improving the safety of engine operation. Moreover, the extracted gas can flow back to the intake manifold, preventing environmental pollution. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a method for controlling the hydrogen concentration in the crankcase of a hydrogen engine, a control system for the hydrogen concentration in the crankcase of a hydrogen engine, electronic equipment, and a storage medium. It aims to solve the technical problems of low accuracy and insufficient safety in crankcase hydrogen concentration control caused by insufficient gas supply, reliance on adsorption components leading to easy failure, or control lag in the prior art.

[0006] This invention provides the following solution:

[0007] According to one aspect of the present invention, a method for controlling hydrogen concentration in the crankcase of a hydrogen engine is provided, comprising the following steps:

[0008] Step S1: Place the hydrogen engine on a test bench for testing and obtain the target hydrogen concentration. Measured hydrogen concentration and crankcase blow-by volume ;

[0009] Based on the target hydrogen concentration Measured hydrogen concentration and crankcase blow-by volume Calculate the air volume under the target operating condition ;

[0010] Among them, the air volume under the target operating condition is calculated. Specifically:

[0011] ;

[0012] Based on the target operating condition air volume, and considering the speed and load of different operating conditions, a database of supplementary air volume for all operating conditions is generated.

[0013] Step S2: In actual operation, based on the full-condition replenishment air volume database, obtain the amount of fresh air required to replenish the current target condition.

[0014] Obtain intake pressure Intake air temperature and crankcase pressure ;

[0015] Based on the required amount of fresh air to be supplied under the current target operating conditions, combined with the intake pressure Intake air temperature and crankcase pressure Calculate the throttle valve opening. ;

[0016] based on ,

[0017] Obtaining openness:

[0018] in,

[0019] This represents the gas constant in the ideal gas law; the ideal gas law is PV = nRT.

[0020] This indicates the engine intake air temperature and / or the throttle valve inlet temperature;

[0021] This indicates the engine intake pressure and / or the throttle valve inlet pressure;

[0022] This indicates crankcase pressure and / or throttle valve outlet pressure;

[0023] Indicates the pressure ratio across the throttle valve The function;

[0024] Step S3: Based on the hydrogen concentration measured by the hydrogen concentration sensor under the current target operating condition... , with the target hydrogen concentration The hydrogen concentration deviation was obtained through comparison. Calculate the hydrogen concentration deviation correction for fresh air volume. Added to the target operating condition supplemental air volume Above, a corrected fresh air volume is generated. Return to step 1 and adjust the fresh air volume accordingly. The database of supplemental air volume under all operating conditions is corrected, and the actual crankcase hydrogen concentration is controlled in a closed loop by adjusting the throttle valve opening.

[0025] Furthermore, including:

[0026] Generate corrected fresh air volume Specifically:

[0027] ;

[0028] ;

[0029] ;

[0030] in, For hydrogen concentration deviation, To measure the hydrogen concentration, For the target hydrogen concentration, To replenish air volume for the target operating condition, Correct the amount of fresh air for hydrogen concentration deviation.

[0031] Furthermore, including:

[0032] The crankcase blow-by volume is calculated by taking the average value of multiple values ​​based on the target operating conditions.

[0033] Furthermore, including:

[0034] Step S2 further includes: determining whether the current target operating condition matches the adjacent discrete calibration operating condition points in the full operating condition supplementary air volume database;

[0035] If there is a mismatch, the required fresh air volume for the current target operating condition and the full-condition replenishment air volume database will be recalculated, and the full-condition replenishment air volume database will be updated based on the calculation results.

[0036] Furthermore, including:

[0037] Determining whether the current target operating condition matches the adjacent discrete calibration operating condition points in the full-condition supplementary air volume database includes obtaining the calculation results through linear interpolation.

[0038] According to a second aspect of the present invention, a hydrogen concentration control system for a hydrogen engine crankcase is provided, comprising:

[0039] Intake line, supplemental air line, throttle valve, engine cover, controller, crankcase ventilation system, temperature sensor, hydrogen concentration sensor, and pressure sensor.

[0040] The crankcase ventilation device is connected to the engine and is equipped with a hydrogen concentration sensor and a crankcase pressure sensor. The hydrogen concentration sensor is used to monitor the hydrogen concentration in the crankcase in real time; the crankcase pressure sensor is used to monitor the pressure in the crankcase.

[0041] The intake pipe is equipped with a pressure sensor and a temperature sensor;

[0042] The pressure sensor is used to monitor engine intake pressure and throttle valve inlet pressure;

[0043] The temperature sensor is used to monitor the engine intake air temperature and the throttle valve inlet temperature.

[0044] A throttle valve is installed on the air supply line, and the throttle valve is used to adjust the opening degree;

[0045] The engine cover is used to form a channel for guiding gas to the crankcase ventilation device.

[0046] The controller is used to receive data from the hydrogen concentration sensor, the intake manifold pressure sensor, the temperature sensor, the crankcase ventilation device pressure sensor, the real-time speed, and the real-time load.

[0047] Based on the full-condition replenishment air volume database, the hydrogen concentration detected by the hydrogen concentration sensor is determined and compared with the target hydrogen concentration to obtain the hydrogen concentration deviation. The required fresh air volume is then calculated and the required fresh air volume is generated.

[0048] Based on the required amount of fresh air, a signal is output to control the opening of the throttle valve.

[0049] Furthermore, including:

[0050] The controller receives real-time speed and load data and matches them with adjacent discrete calibration points in the full-condition supplementary air volume database.

[0051] Furthermore, including:

[0052] Based on the preset bilinear interpolation algorithm, the interpolation results of the target fresh air volume and the cross-flow volume are calculated according to the difference ratio between the target operating condition parameters and the adjacent calibration operating condition points.

[0053] According to three aspects of the present invention, an electronic device is provided, comprising: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0054] The memory stores a computer program that, when executed by a processor, causes the processor to perform steps of a method for controlling hydrogen concentration in the crankcase of a hydrogen engine.

[0055] According to four aspects of the present invention, a computer-readable storage medium is provided that stores a computer program executable by an electronic device, which, when run on the electronic device, causes the electronic device to perform the steps of a method for controlling hydrogen concentration in the crankcase of a hydrogen engine.

[0056] Compared with the prior art, the present invention has the following advantages:

[0057] This application, by drawing air from the engine intake manifold, can provide several times more fresh air than traditional methods, effectively reducing the hydrogen concentration in the crankcase.

[0058] This application achieves precise control of the amount of fresh air supplied to the engine under all operating conditions by installing an air flow meter and a control valve on the air intake pipeline and according to the control logic, while avoiding excessive air intake from affecting engine performance.

[0059] This application achieves precise matching of gas supply volume under different operating conditions by designing a precise gas supply volume matching logic for all operating conditions, and performs closed-loop correction by combining real-time hydrogen concentration deviation.

[0060] This application introduces a throttle valve in the replenishment pipeline, which directly controls the replenishment volume by adjusting the throttle valve opening. This results in a faster response time, and the throttle valve opening is dynamically adjusted according to the intake pressure and crankcase pressure, effectively preventing excessive or insufficient replenishment volume.

[0061] This application reduces hydrogen concentration by diluting with fresh air, without relying on any adsorption components, and avoids the problems of saturation and efficiency decay. It has low maintenance costs, and the dilution effect is related to the amount of fresh air, with minimal impact from environmental factors, making it suitable for the entire life cycle and all operating conditions of the engine.

[0062] This application introduces fresh air from the engine intake manifold to supplement the crankcase, and the treated crankcase gas is discharged through the existing ventilation system, avoiding the interference of impurities flowing back into the intake system and combustion process, thus ensuring the engine's power performance and fuel economy.

[0063] This application combines a calibrated full-condition supplemental air volume database with closed-loop correction to match the supplemental air volume under different operating conditions in real time. It can quickly supplement air under high operating conditions and accurately control the supplemental air volume under low operating conditions, avoiding abnormal crankcase pressure and balancing safety and engine performance. Attached Figure Description

[0064] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0065] Figure 1 This is a flowchart of a method for controlling hydrogen concentration in the crankcase of a hydrogen engine, provided by one or more embodiments of the present invention.

[0066] Figure 2This is a structural diagram of a hydrogen concentration control system for a hydrogen engine crankcase provided by one or more embodiments of the present invention.

[0067] Figure 3 This is a structural diagram of a hydrogen concentration control system for a hydrogen engine crankcase, according to a specific embodiment of the present invention.

[0068] Figure 4 This is a parameter table of the amount of fresh air required to be supplemented under all operating conditions (partial) based on speed and load, according to a specific embodiment of the present invention.

[0069] Figure 5 This is an electronic device structural block diagram of a hydrogen engine crankcase hydrogen concentration control method provided by one or more embodiments of the present invention. Detailed Implementation

[0070] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0071] Figure 1 This is a flowchart of a method for controlling hydrogen concentration in the crankcase of a hydrogen engine, provided by one or more embodiments of the present invention.

[0072] like Figure 1 As shown, it includes the following steps:

[0073] Step S1: Place the hydrogen engine on a test bench for testing and obtain the target hydrogen concentration. Measured hydrogen concentration and crankcase blow-by volume ;

[0074] Based on the target hydrogen concentration Measured hydrogen concentration and crankcase blow-by volume Calculate the supplemental air volume for the target operating condition ;

[0075] Among them, the amount of supplemental air for the target operating condition is calculated. Specifically:

[0076] ;

[0077] Based on the target operating condition, supplementary air volume is added, and a database of supplementary air volume for all operating conditions is generated based on the speed and load of different operating conditions.

[0078] Specifically, through bench testing, the amount of fresh air supplied to reduce the crankcase hydrogen concentration to a safe target value was determined for different engine speeds and load conditions, and a database of supplementary air volume covering all engine operating conditions was generated; target hydrogen concentration The preset safe hydrogen concentration value for the crankcase is set to address the issue of the wide explosion limit range of hydrogen. The conventional setting is that the volume concentration of hydrogen in the air does not exceed 4%, and if it exceeds 4%, there is a risk of explosion.

[0079] Measured hydrogen concentration This represents the actual hydrogen concentration detected in the crankcase under a specific speed / load condition during bench testing, without the addition of fresh air. It reflects the initial hydrogen concentration of blow-by gas under that condition. Figure 4 As shown.

[0080] crankcase blow-by This parameter represents the flow rate of gas from the engine cylinder into the crankcase under a specific operating condition during bench testing. It reflects the total amount of blow-by gas that needs to be diluted.

[0081] By calculating the specific supplementary air volume for a particular operating condition based on the above parameters, a database of supplementary air volumes for all operating conditions is calibrated.

[0082] Step S2: In actual operation, based on the full-condition replenishment air volume database, obtain the amount of fresh air required to replenish the current target condition.

[0083] Obtain intake pressure Intake air temperature and crankcase pressure ;

[0084] Based on the required amount of fresh air to be supplied under the current target operating conditions, combined with the intake pressure Intake air temperature and crankcase pressure Calculate the throttle valve opening. ;

[0085] based on ;

[0086] Obtaining openness: ;

[0087] in,

[0088] This represents the gas constant in the ideal gas law; the ideal gas law is PV = nRT.

[0089] This indicates the engine intake air temperature and / or the throttle valve inlet temperature;

[0090] This indicates the engine intake pressure and / or the throttle valve inlet pressure;

[0091] This indicates crankcase pressure and / or throttle valve outlet pressure;

[0092] Indicates the pressure ratio across the throttle valve The function;

[0093] Specifically, when the vehicle is running, the required amount of fresh air under the current operating conditions is first determined by querying the full-condition replenishment air database based on the current engine speed and load.

[0094] Simultaneously acquire intake pressure in real time. Intake air temperature and crankcase pressure ;

[0095] Among them, intake pressure The pressure of the throttle valve is also derived from the engine intake pressure. The higher the pressure, the greater the intake volume for the same opening.

[0096] Intake temperature This represents the air temperature at the throttle valve inlet, and also the engine's intake air temperature. Temperature affects air density; the higher the temperature, the lower the density, and the smaller the intake air volume under the same pressure.

[0097] Crankcase pressure This represents the pressure at the throttle valve outlet, and also the crankcase pressure. When the crankcase pressure is higher than the engine intake pressure, the intake volume will be difficult to reach the target.

[0098] Based on the required amount of fresh air under the current operating conditions, and in conjunction with the intake pressure Intake air temperature and crankcase pressure This allows for the calculation of the throttle valve opening, which in turn controls the flow rate of diluted air within the engine.

[0099] Step S3: Based on the hydrogen concentration measured by the hydrogen concentration sensor under the current target operating condition... , with the target hydrogen concentration The hydrogen concentration deviation was obtained through comparison. Calculate the hydrogen concentration deviation correction for fresh air volume. Added to the amount of fresh air Above, a corrected fresh air volume is generated. Return to step 1 and adjust the fresh air volume accordingly. The database of supplemental air volume under all operating conditions is corrected, and the actual crankcase hydrogen concentration is controlled in a closed loop by adjusting the throttle valve opening.

[0100] Specifically, during actual vehicle operation, the hydrogen concentration in the crankcase is significantly affected by dynamic factors. When engine operating conditions fluctuate, such as sudden changes in speed or load, the blow-by volume changes instantaneously; hydrogen concentration sensor drift, measurement deviations caused by changes in ambient temperature or pressure; fluctuations in hydrogen blow-by composition, such as differences in the proportion of hydrogen in the blow-by gas caused by changes in fuel combustion efficiency. Fixed databases cannot respond to this dynamic change in real time, which can easily lead to the actual hydrogen concentration deviating from the target value. Excessive hydrogen concentration poses an explosion risk.

[0101] When using a database calibrated through bench testing, the time lag between changes in operating conditions and database updates can easily lead to lag in concentration control. For example, during rapid acceleration, blow-by gas volume surges, and the fixed air volume cannot dilute it in time. Under rapid acceleration conditions, the engine needs to quickly increase power, which will increase the fuel injection volume and increase the intake air volume, causing the combustion pressure in the cylinder to rise sharply. The dilution process lags behind the rate of increase in blow-by gas.

[0102] During long-term operation, sensor errors and component aging can lead to the accumulation of deviations. Therefore, static correction in the existing technology suffers from hysteresis and cumulative error.

[0103] By returning to step 1, adjust the fresh air volume accordingly. The full-condition supplementary air volume database is corrected, and the fresh air volume is corrected by calculating the hydrogen concentration deviation to deal with the gas flow fluctuations in transient conditions (such as cold start and rapid acceleration).

[0104] By repeatedly correcting and accumulating data in the database, the baseline air volume under different operating conditions is updated, enabling the database to adapt to the lag and cumulative error problems existing in the current technology.

[0105] Traditional databases need to cover thousands of operating conditions, resulting in long bench calibration cycles. Step S3 weakens the dependence on the accuracy of the initial database through closed-loop correction: even if there are errors in the initial calibration, the system can compensate in real time through Delta_air; in long-term use, the database automatically iterates and optimizes, reducing the frequency of later recalibration and significantly reducing engineering maintenance costs.

[0106] Furthermore, including:

[0107] Generate corrected fresh air volume Specifically:

[0108] ;

[0109] ;

[0110] ;

[0111] in, For hydrogen concentration deviation, To measure the hydrogen concentration, For the target hydrogen concentration, To replenish air volume for the target operating condition, Correct the amount of fresh air for hydrogen concentration deviation.

[0112] Specifically,

[0113] Furthermore, including:

[0114] The crankcase blow-by volume is calculated by taking the average value of multiple values ​​based on the target operating conditions.

[0115] Specifically, under the same target operating conditions, the crankcase blow-by volume of an engine will fluctuate, including: instantaneous fluctuations during the combustion process, dynamic differences in the piston ring-cylinder wall seal, and transient pressure fluctuations in the intake / exhaust system. Based on the above factors, it is impossible to reflect the typical stable value under the operating conditions.

[0116] By repeatedly measuring under the target operating conditions and then calculating the arithmetic mean, the effects of fluctuation factors can be offset.

[0117] Furthermore, including:

[0118] Step S3 further includes: determining whether the current target operating condition matches the adjacent discrete calibration operating condition points in the full operating condition supplementary air volume database;

[0119] If there is a mismatch, the required fresh air volume for the current target operating condition and the full-condition replenishment air volume database will be recalculated, and the full-condition replenishment air volume database will be updated based on the calculation results.

[0120] Furthermore, including:

[0121] Determining whether the current target operating condition matches the adjacent discrete calibration operating condition points in the full-condition supplementary air volume database includes obtaining the calculation results through linear interpolation.

[0122] Specifically, by determining whether the current operating condition matches adjacent discrete calibration points, for mismatched operating conditions: the required supplemental air volume based on the actual measured current operating condition is recalculated and included in the database, expanding the database from a discrete point set to a dataset that dynamically covers continuous operating conditions; special operating conditions (such as extreme environments and typical operating conditions in the later stages of aging) are gradually included to avoid control failures caused by the lack of reference values. Especially for hydrogen engines, this can eliminate the risk of uncontrolled hydrogen concentration caused by blind spots in operating conditions.

[0123] For the current target operating condition (non-calibrated operating condition), the theoretical supplementary air volume for this intermediate operating condition is obtained through "linear proportional calculation" based on the air volume data of two adjacent discrete calibration operating condition points in the database.

[0124] Linear interpolation uses known patterns among adjacent calibration points to derive intermediate values, avoiding the coarseness of nearest-point substitution. For example:

[0125] For the 1700rpm operating condition between 1500rpm (calibration point A, air volume 100L / min) and 2000rpm (calibration point B, air volume 150L / min), interpolation yields an air volume of 120L / min (closer to actual requirements). Directly using the data from point A (100L / min) would underestimate the demand, leading to an overestimation of hydrogen concentration. Actual measurements show that for non-extreme operating conditions (where adjacent points exhibit approximately linear characteristics), the interpolation error can be controlled within 5%, far lower than the 15%-20% error of substituting the nearest point.

[0126] After introducing interpolation, the judgment of whether the working conditions match is upgraded from the absolute value of parameter deviation to the deviation between the interpolation result and the actual requirements:

[0127] If the deviation between the interpolated air volume and the actual air volume required under the current operating conditions is ≤ a threshold (e.g., 3%), then it is determined to be an indirect match, and there is no need to update the database (the accuracy can be met by using the interpolation result).

[0128] A mismatch is only identified and an update is recalculated when the deviation exceeds a threshold. This mechanism reduces the database update frequency by 40%-60%, avoiding overreactions that trigger updates due to minor parameter fluctuations and ensuring database stability.

[0129] Linear interpolation involves minimal computation, far less computation than recalculation. In the control of hydrogen concentration in the crankcase of a hydrogen engine:

[0130] For rapidly changing transient conditions, such as when the operating conditions cross 3 calibration points within 1 second during rapid acceleration, interpolation can provide real-time air volume reference values ​​to ensure that the throttle valve adjustment is without delay.

[0131] Deep calculations are only initiated for special operating conditions where interpolation errors exceed the limit, balancing control speed and final accuracy, and avoiding hydrogen concentration fluctuations caused by calculation delays.

[0132] Linear interpolation can reduce the initial calibration point density (e.g., from one point every 200 rpm to one point every 500 rpm), and cover intermediate operating conditions through mathematical methods, reducing the workload of bench calibration by 30%-50%. At the same time, for unforeseen special operating conditions, such as intermediate speeds under extreme temperatures, interpolation can provide a baseline calculation value to avoid control logic failure.

[0133] Figure 2 This is a structural diagram of a hydrogen concentration control system for a hydrogen engine crankcase provided by one or more embodiments of the present invention.

[0134] like Figure 2 As shown, the system includes:

[0135] Intake line, supplemental air line, throttle valve, engine cover, controller, crankcase ventilation system, temperature sensor, hydrogen concentration sensor, and pressure sensor.

[0136] The crankcase ventilation device is connected to the engine and is equipped with a hydrogen concentration sensor and a crankcase pressure sensor. The hydrogen concentration sensor is used to monitor the hydrogen concentration in the crankcase in real time; the crankcase pressure sensor is used to monitor the pressure in the crankcase.

[0137] The intake pipe is equipped with a pressure sensor and a temperature sensor;

[0138] The pressure sensor is used to monitor engine intake pressure and throttle valve inlet pressure;

[0139] The temperature sensor is used to monitor the engine intake air temperature and the throttle valve inlet temperature.

[0140] A throttle valve is installed on the air supply line, and the throttle valve is used to adjust the opening degree;

[0141] The engine cover is used to form a channel for guiding gas to the crankcase ventilation device.

[0142] The controller is used to receive data from the hydrogen concentration sensor, the intake manifold pressure sensor, the temperature sensor, the crankcase ventilation device pressure sensor, the real-time speed, and the real-time load.

[0143] Based on the full-condition replenishment air volume database, the hydrogen concentration detected by the hydrogen concentration sensor is determined and compared with the target hydrogen concentration to obtain the hydrogen concentration deviation. The required fresh air volume is then calculated and the required fresh air volume is generated.

[0144] Based on the required amount of fresh air, a signal is output to control the opening of the throttle valve.

[0145] Specifically, by drawing air from the engine intake, this invention can provide several times more fresh air than traditional methods, effectively reducing the hydrogen concentration in the crankcase. To avoid excessive air intake affecting engine performance, this invention installs an air flow meter and control valve on the intake line and designs a control logic to precisely control the amount of fresh air supplied to the engine under all operating conditions.

[0146] This invention addresses the safety issues that can arise from high hydrogen concentrations due to crankcase blow-by in hydrogen engines, including issues related to the throttle valve, hydrogen concentration sensor, and crankcase pressure sensor. It requires calibrating the required fresh air volume (MAP) for all engine operating conditions (x and y axes) on an engine bench based on the target hydrogen concentration and crankcase blow-by volume. During vehicle operation, the required fresh air volume is first determined by referring to the calibrated MAP based on the operating conditions. The throttle valve opening is then calculated using the intake pressure and crankcase pressure. Next, the hydrogen concentration measured by the hydrogen concentration sensor is compared with the target hydrogen concentration to obtain the hydrogen concentration deviation. The required fresh air volume is then calculated, added to the required fresh air volume, and the throttle valve opening is controlled to achieve closed-loop control of the hydrogen concentration.

[0147] Figure 3 This is a structural diagram of a hydrogen concentration control system for a hydrogen engine crankcase, according to a specific embodiment of the present invention.

[0148] like Figure 3 As shown, it includes:

[0149] The system includes a throttle valve, hydrogen concentration sensor, and crankcase pressure sensor. On an engine test bench, the required fresh air volume (MAP) for all engine operating conditions (with engine speed and load as the x and y axes) needs to be calibrated based on the target hydrogen concentration and crankcase blow-by volume. During vehicle operation, the required fresh air volume is first determined by referring to the calibrated MAP based on the operating conditions. The throttle valve opening is then calculated using the intake pressure and crankcase pressure. Next, the hydrogen concentration measured by the hydrogen concentration sensor is compared with the target hydrogen concentration to obtain the hydrogen concentration deviation. The required fresh air volume is then calculated, added to the required fresh air volume, and the throttle valve opening is controlled to achieve closed-loop control of the hydrogen concentration.

[0150] The following is in conjunction with the appendix Figure 3 The present invention will be further described in detail below. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the invention, not the entire structure.

[0151] Figure 3 This is a schematic diagram of a crankcase hydrogen concentration control system designed to address safety issues caused by high hydrogen concentrations in the crankcase of a hydrogen engine. The system includes a throttle valve, a hydrogen concentration sensor, and a crankcase pressure sensor. The following details the system's operation:

[0152] Step 1: On the engine test bench, based on the target hydrogen concentration Measured hydrogen concentration Crankcase blow-by volume The amount of fresh air required to reduce the hydrogen concentration to the required level under various operating conditions is calculated based on the following formula.

[0153] ;

[0154] MAP, which specifies the amount of fresh air required to replenish the engine under all operating conditions (with Speed ​​and Load as the x and y axes).

[0155] Step 2: During vehicle operation, refer to the calibrated fresh air volume MAP based on the operating conditions (speed and load) to determine the required fresh air volume. Combined with intake pressure Intake temperature and crankcase pressure Calculate the throttle valve opening .

[0156] based on ;

[0157] Obtaining openness: ;

[0158] in,

[0159] This represents the gas constant in the ideal gas law; the ideal gas law is PV = nRT.

[0160] This indicates the engine intake air temperature, which is also the throttle valve inlet temperature;

[0161] This indicates the engine intake pressure, which is also the throttle valve inlet pressure;

[0162] This indicates the crankcase pressure, which is also the throttle valve outlet pressure;

[0163] Indicates the pressure ratio across the throttle valve The function.

[0164] Step 3: Considering manufacturing tolerances and wear levels, the actual crankcase hydrogen concentration during operation may differ from that during calibration. It is necessary to adjust the hydrogen concentration based on the current operating conditions and the hydrogen concentration measured by the sensor. , with the target hydrogen concentration By comparison, we can obtain Calculate , superimposed Go back to step 1, then back to step 2, and adjust the throttle valve opening to perform closed-loop control of the actual crankcase hydrogen concentration.

[0165] ;

[0166] ;

[0167] .

[0168] Specifically, traditional methods are limited by the motor performance of the electric oil-gas separator, with a maximum speed of only 100,000-105,000 rpm, providing a maximum fresh air intake of approximately 5 kg / h, and reducing the crankcase hydrogen concentration to a maximum of 30,000 ppm. Taking air from the engine intake can provide several times more fresh air than traditional methods, effectively reducing the crankcase hydrogen concentration. Furthermore, to avoid excessive air intake affecting engine performance, an air flow meter and control valve are installed on the intake line, and a control logic is designed to precisely control the fresh air intake under all engine operating conditions.

[0169] To address the safety concerns arising from high hydrogen concentrations due to crankcase blow-by in hydrogen engines, including the throttle valve, hydrogen concentration sensor, and crankcase pressure sensor, a MAP (Maximum Amount of Fresh Air) needs to be calibrated on an engine test bench based on the target hydrogen concentration and crankcase blow-by volume. This MAP specifies the required fresh air volume for all engine operating conditions (with engine speed and load as the x and y axes). During vehicle operation, the required fresh air volume is first determined by referring to the calibrated MAP, and then the throttle valve opening is calculated using the intake pressure and crankcase pressure. Next, the hydrogen concentration measured by the hydrogen concentration sensor is compared with the target hydrogen concentration to obtain the hydrogen concentration deviation. The required fresh air volume is then calculated, added to the required fresh air volume, and the throttle valve opening is controlled to achieve closed-loop control of the hydrogen concentration.

[0170] Figure 4 This is a block diagram of an electronic device for controlling hydrogen concentration in the crankcase of a hydrogen engine, provided by one or more embodiments of the present invention.

[0171] like Figure 4 As shown, this application provides an electronic device, including: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0172] The memory stores a computer program that, when executed by a processor, causes the processor to perform the steps of a method for controlling the hydrogen concentration in the crankcase of a hydrogen engine.

[0173] This application also provides a computer-readable storage medium storing a computer program executable by an electronic device, which, when run on the electronic device, causes the electronic device to perform the steps of a method for controlling the hydrogen concentration in the crankcase of a hydrogen engine.

[0174] For the sake of simplicity, the method embodiments are described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0175] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of this application.

[0176] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling hydrogen concentration in the crankcase of a hydrogen engine, characterized in that, Includes the following steps: Step S1: Place the hydrogen engine on a test bench for testing and obtain the target hydrogen concentration. Measured hydrogen concentration and crankcase blow-by volume ; Based on the target hydrogen concentration Measured hydrogen concentration and crankcase blow-by volume Calculate the supplemental air volume for the target operating condition ; Among them, the amount of supplemental air for the target operating condition is calculated. Specifically: ； Based on the target operating condition, supplementary air volume is added, and a database of supplementary air volume for all operating conditions is generated based on the speed and load of different operating conditions. Step S2: In actual operation, based on the full-condition replenishment air volume database, obtain the amount of fresh air required to replenish the current target condition. Obtain intake pressure Intake air temperature and crankcase pressure ; Based on the required amount of fresh air to be supplied under the current target operating conditions, combined with the intake pressure Intake air temperature and crankcase pressure Calculate the throttle valve opening. ; based on , Obtaining openness: ; in, This represents the gas constant in the ideal gas law; the ideal gas law is PV = nRT. This indicates the engine intake air temperature and / or the throttle valve inlet temperature; This indicates the engine intake pressure and / or the throttle valve inlet pressure; Indicates crankcase pressure and / or throttle valve outlet pressure; Indicates the pressure ratio across the throttle valve The function; Step S3: Based on the hydrogen concentration measured by the hydrogen concentration sensor under the current target operating condition... , with the target hydrogen concentration The hydrogen concentration deviation was obtained through comparison. Calculate the hydrogen concentration deviation correction for fresh air volume. Added to the target operating condition supplemental air volume Above, a corrected fresh air volume is generated. Return to step 1 and adjust the fresh air volume accordingly. The database of supplemental air volume under all operating conditions is corrected, and the actual crankcase hydrogen concentration is controlled in a closed loop by adjusting the throttle valve opening. Among them, the generation of corrected fresh air volume Specifically: ； ； ； in, For hydrogen concentration deviation, To measure the hydrogen concentration, For the target hydrogen concentration, To replenish air volume for the target operating condition, Correct the amount of fresh air for hydrogen concentration deviation.

2. The method for controlling hydrogen concentration in the crankcase of a hydrogen engine according to claim 1, characterized in that, Step S2 further includes: determining whether the current target operating condition matches the adjacent discrete calibration operating condition points in the full operating condition supplementary air volume database; If there is a mismatch, the required fresh air volume for the current target operating condition and the full-condition supplementary air volume database are recalculated, and the full-condition supplementary air volume database is updated based on the calculation results.

3. The method for controlling hydrogen concentration in the crankcase of a hydrogen engine according to claim 2, characterized in that, The step of determining whether the current target operating condition matches the adjacent discrete calibration operating condition points in the full operating condition supplementary air volume database includes obtaining the calculation results through linear interpolation.

4. A hydrogen concentration control system for a hydrogen engine crankcase, characterized in that, include: Intake line, air supply line, throttle valve, engine cover, controller, crankcase ventilation system, temperature sensor, hydrogen concentration sensor and pressure sensor; The pressure sensors include: crankcase pressure sensor, intake manifold pressure sensor, and crankcase ventilation device pressure sensor; The crankcase ventilation device is connected to the engine and is equipped with a hydrogen concentration sensor and a crankcase pressure sensor. The hydrogen concentration sensor is used to monitor the hydrogen concentration in the crankcase in real time; the crankcase pressure sensor is used to monitor the pressure in the crankcase. An intake pipe pressure sensor and a temperature sensor are installed on the intake pipe. The intake manifold pressure sensor is used to monitor the engine intake pressure and the throttle valve inlet pressure. The temperature sensor is used to monitor the engine intake air temperature and the throttle valve inlet temperature. A throttle valve is installed on the air supply line, and the throttle valve is used to adjust the opening degree; The engine cover is used to form a channel for guiding gas for the crankcase ventilation device; The controller is used to receive data from hydrogen concentration sensor, intake manifold pressure sensor, temperature sensor, crankcase ventilation device pressure sensor, real-time speed, and real-time load. The system, according to claim 1, uses the method for controlling the hydrogen concentration in the crankcase of a hydrogen engine to perform closed-loop control of the actual hydrogen concentration in the crankcase by adjusting the opening of the throttle valve.

5. A hydrogen concentration control system for a hydrogen engine crankcase according to claim 4, characterized in that, The controller receives real-time speed and load data and matches them with adjacent discrete calibration points in the full-condition supplementary air volume database.

6. A hydrogen concentration control system for a hydrogen engine crankcase according to claim 4, characterized in that, Based on the preset bilinear interpolation algorithm, the interpolation results of the target fresh air volume and the cross-flow volume are calculated according to the difference ratio between the target operating condition parameters and the adjacent calibration operating condition points.

7. A hydrogen concentration control system for a hydrogen engine crankcase according to claim 6, characterized in that, Based on the interpolation results, update the full-condition supplemental air volume database.

8. An electronic device, characterized in that, include: The processor, communication interface, memory, and communication bus are connected, with the processor, communication interface, and memory communicating with each other via the communication bus. The memory stores a computer program that, when executed by the processor, causes the processor to perform the steps of the hydrogen concentration control method for a hydrogen engine crankcase according to any one of claims 1-3.

9. A computer-readable storage medium, characterized in that, It stores a computer program executable by an electronic device, which, when run on the electronic device, causes the electronic device to perform the steps of a method for controlling the hydrogen concentration in the crankcase of a hydrogen engine as described in any one of claims 1-3.

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