Hydrogen ejector optimization device and method

Abstract

The invention is suitable for the technical field of vehicle power engines, and provides a hydrogen ejector optimizing device and method.The device comprises a shell, a needle valve, a drainage cover and a cam; a first channel and a second channel are arranged in the shell, and the needle valve is arranged in the first channel and the second channel in a penetrating mode. One end of the needle valve is provided with a column head, and the column head is located outside the first channel and abuts against the cam; an elastic piece and a clamping piece are arranged in the first channel; a sealing cap is further arranged in the first channel. Through a plurality of detachably connected components arranged on the device, the hardware performance of the equipment can be conveniently adjusted, so that the overall influence of different hardware parameters of the hydrogen injection system on the system performance can be conveniently researched and verified; and through the arranged cam driving assembly, the jet flow characteristic of the outward-opening type direct-injection hydrogen nozzle is conveniently researched, and the problem that the injection amount of an existing hydrogen injector needs to be increased in unit time is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle power engines, and in particular relates to a hydrogen injector optimization device and method. Background Art

[0002] A hydrogen internal combustion engine (HICE) is an internal combustion engine that uses hydrogen as fuel. Unlike traditional gasoline or diesel internal combustion engines, hydrogen internal combustion engines generate power by burning hydrogen. Compared with other fuel injectors, hydrogen injectors have significant advantages such as energy saving, zero carbon emissions, and high efficiency. Therefore, hydrogen injectors are one of the strategies to deal with energy crises and environmental pollution.

[0003] Hydrogen internal combustion engines are mainly divided into port fuel injection (PFI) and direct injection (DI) based on the hydrogen injection method. For PFI hydrogen internal combustion engines, hydrogen occupies a part of the cylinder working volume, which will lead to low output power and may induce abnormal combustion such as knock and backfire. DI hydrogen internal combustion engines avoid the problem of hydrogen occupying the cylinder working volume, and can suppress the occurrence of backfire and pre-ignition. However, the thermal efficiency and NOx emissions of DI hydrogen internal combustion engines are closely related to the in-cylinder mixing quality of hydrogen and air. The mixture formation process is affected by the comprehensive influence of injection characteristics, airflow motion characteristics and chamber, among which the gas jet characteristics are dominant. The turbulence caused by the gas jet will further affect combustion and emissions.

[0004] However, the existing devices used for hydrogen injector research, simulation and optimization are difficult to comprehensively and accurately consider the impact of factors such as gas jet characteristics, motion characteristics, and changes in various parameters of the device hardware on the overall performance of the injector device, and their optimization research results have many limitations. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a hydrogen injector optimization device, which aims to solve the problem that the existing devices for hydrogen injector research simulation optimization are difficult to comprehensively and accurately consider the influence of factors such as gas jet characteristics, motion characteristics, and changes in various parameters of the device hardware on the overall performance of the injector device, and its optimization research effect has strong limitations.

[0006] The embodiment of the present application is implemented by providing a hydrogen injector optimization device, the device comprising:

[0007] A housing, a needle valve, a drainage cover and a cam; a first channel and a second channel are arranged inside the housing, a boss is arranged between the first channel and the second channel to divide the first channel and the second channel, and the side wall of the second channel is connected with an intake channel; the needle valve is arranged in the first channel and the second channel through; a cone head is arranged at one end of the needle valve, the cone head is located outside the second channel, and a column head is arranged at the other end of the needle valve, the column head is located outside the first channel and abuts against the cam; an elastic member and a clamping member are arranged in the first channel, the elastic member One end of the component abuts against the shell, and the other end abuts against the clamping component, and the clamping component is clamped and fixed with the needle valve; a sealing cap is also provided in the first channel, the outer wall of the boss is provided with convex ridges, the inner wall of the sealing cap is provided with grooves, the outer wall of the boss is fitted with the inner wall of the sealing cap, and the convex ridges are clamped with the inside of the groove; a through hole is also provided in the radial center of the sealing cap, and the needle valve passes through the through hole and fits with the inner wall of the through hole; the drainage cover is covered and arranged on the outside of the opening of the second channel, and is detachably connected to the shell, and a spray hole is provided on the drainage cover.

[0008] Preferably, the clamping member is detachably clamped to the needle valve via a locking clamp; the locking clamp comprises a first half locking clamp and a second half locking clamp, the first half locking clamp and the second half locking clamp are both embedded in the needle valve and clamped together to form an annular platform; the elastic member is provided with a pre-tightening force; the clamping member is provided with a concave table surface, the concave table surface abuts against the outer wall of the annular platform to limit the clamping member.

[0009] Preferably, the sealing cap is also connected to an annular fastener, and the annular fastener is used to press the sealing cap tightly onto the needle valve; the cone head opening angle is 90 degrees.

[0010] Preferably, the first channel and the second channel are both cylindrical cavities, and the central axis of the first channel and the central axis of the second channel are collinear.

[0011] Preferably, an annular drainage groove is further provided on the inner wall of the second channel, and the annular drainage groove is communicated with the air inlet channel, so that the gas entering the device through the air inlet channel flows evenly toward the outlet in the second channel.

[0012] Another object of the embodiment of the present application is to provide a method for optimizing a hydrogen injector, the method comprising:

[0013] Based on the mechanical properties of the physical model of the hydrogen injector optimization device as described above, a digital calculation model corresponding to the physical model is constructed in a simulation platform; the performance parameters of the digital calculation model are changed to obtain the influence of the change of the performance parameters on the gas jet characteristics; based on the gas jet characteristics, the optimal configuration parameters of the system are obtained; based on the optimal configuration parameters, the physical model is adjusted, and verification is performed based on the physical model to obtain an optimized hydrogen injection device.

[0014] Preferably, the performance parameters of the digital calculation model include one or more of the following parameters: hydrogen supply pressure of hydrogen gas introduced into the intake passage, needle valve mass, elastic member stiffness, elastic member preload force, hole area of ​​the spray hole, and the number of spray holes.

[0015] Preferably, the digital computing model comprises:

[0016] A cam drive module and a hydrogen injector module; the cam drive module and the hydrogen injector module are connected via a high-pressure oil circuit; the cam drive module comprises a cam model and a hydraulic piston, the cam model drives the hydraulic piston to reciprocate linearly by continuous rotation, so that the hydraulic oil is compressed to form high-pressure oil, and the high-pressure oil is introduced into the hydrogen injector module through the high-pressure oil circuit; the hydrogen injector module comprises a needle valve, a return spring, a hydrogen gas source inlet end and a high-pressure oil inlet end; the needle valve is used to simulate a cone valve, and the return spring is used to provide a warning force to press the needle valve against the valve seat when the hydrogen injector is not working.

[0017] Preferably, the digital computing model further includes:

[0018] A feedback force providing module is used to obtain the hydrogen injection amount per unit time, and based on the hydrogen injection amount per unit time, feedback adjust the return spring force, the oil supply pressure of the high-pressure oil and the hydrogen supply pressure in the hydrogen injector module.

[0019] The embodiment of the present application provides a hydrogen injector optimization device, which has the following outstanding advantages: through the several detachable and connected components provided in the device, the hardware performance of the device can be easily adjusted, thereby facilitating the study and verification of the overall impact of different hardware parameters of the hydrogen injection system on the system performance; through the provided cam drive component, it is convenient to study the jet characteristics of the outward-opening direct-injection hydrogen nozzle, and solve the problem that the injection amount per unit time of the existing hydrogen injector needs to be improved. The experimental device provided in the present application can effectively verify the hydrogen injection performance of the direct-injection hydrogen engine in the cylinder. Through this method, an optimization scheme for the hydrogen injection amount per unit time can be obtained, thereby improving the working efficiency of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A diagram of a hydrogen injector optimization device provided in an embodiment of the present application;

[0021] Figure 2 Provided in the embodiments of this application Figure 1 A local enlarged view of the point A marked in FIG.

[0022] Figure 3 A partial cross-sectional view of a housing provided in an embodiment of the present application;

[0023] Figure 4 An exploded view of a hydrogen injector optimization device provided in the present application;

[0024] Figure 5 A system structure diagram of a digital computing model provided for this application;

[0025] Figure 6 An internal structure diagram of a computer device provided for this application;

[0026] Figure 7 A schematic diagram of a local tappet piston chamber portion in a digital calculation model provided in the present application;

[0027] Figure 8 A schematic diagram of a local feedback force providing module in a digital computing model provided in the present application.

[0028] In the figure: 100, shell; 110, first channel; 111, annular groove; 120, second channel; 121, annular drainage groove; 130, air intake channel; 140, boss; 141, convex ridge; 150, mounting hole; 200, drainage cover; 300, needle valve; 310, cone head; 320, snap-fit ​​groove; 400, sealing cap; 410, groove; 500, locking clip; 600, snap-fit ​​part; 700, elastic part; 800, cam. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but unless otherwise specified, these elements are not limited by these terms. These terms are only used to distinguish a first unit or module from another unit or module. For example, a first module may be referred to as a second module, and similarly, a second module may be referred to as a first module without departing from the scope of this application.

[0031] Figure 1This is a schematic diagram of a hydrogen injector optimization device provided in an embodiment of the present application. Based on this device, various performance parameters of the hydrogen injector can be adjusted conveniently and efficiently, thereby providing a basis for the optimization and verification of the hydrogen injector.

[0032] like Figure 1 and Figure 4 As shown, the hydrogen injector optimization device comprises:

[0033] The housing 100, the needle valve 300, the drainage cover 200 and the cam 800. The housing 100 is provided with a first channel 110 and a second channel 120. A boss 140 is provided between the first channel 110 and the second channel 120 to separate the first channel 110 and the second channel 120. The side wall of the second channel 120 is connected to the Figure 3 The air intake passage 130 shown. The needle valve is arranged in the first passage 110 and the second passage 120; a cone head 310 is arranged at one end of the needle valve 300, and the cone head 310 is located outside the second passage 120; a column head is arranged at the other end of the needle valve, and the column head is located outside the first passage 110 and abuts the cam 800. An elastic member 700 and a clamping member 600 are arranged in the first passage 110, one end of the elastic member 700 abuts against the housing 100, and the other end abuts against the clamping member 600, and the clamping member 600 is clamped and fixed to the needle valve 300. A sealing cap 400 is also provided in the first channel 110, a convex ridge 141 is provided on the outer wall of the boss 140, a groove 410 is provided on the inner wall of the sealing cap 400, the outer wall of the boss 140 is fitted with the inner wall of the sealing cap 400, and the convex ridge 141 is snapped into the inside of the groove 410; a through hole is also provided in the radial center of the sealing cap, the needle valve 300 passes through the through hole and fits with the inner wall of the through hole. The drainage cover 200 is provided to cover the outside of the opening of the second channel 120, and is detachably connected to the housing 100, and a spray hole is provided on the drainage cover 200.

[0034] In this embodiment, the components in the device are conveniently replaced by many conveniently detachable settings. For example, needle valves 300 of different mass densities can be conveniently replaced, so the influence of different performance components on the overall performance of the hydrogen injector can be conveniently studied. The flow guide cover can accurately guide the flow direction of hydrogen, promote a more uniform distribution of hydrogen in the cylinder, effectively improve the gas utilization efficiency, and optimize the overall working efficiency. Therefore, a detachable flow guide cover is provided, and a through hole is provided on the flow guide cover, and the size and number of the through holes can be replaced and selected based on demand. An annular groove can be provided at the lower end of the first channel of the housing to limit the spring. The air intake channel 130 can be used to introduce hydrogen. The flow guide cover 200 can be connected to the housing 100 by a threaded connection, and this connection method makes the replacement of the flow guide cover 200 simple and easy. Therefore, the influence of the number of holes and the aperture on the hydrogen injection characteristics can be explored by replacing the flow guide cover 200 with different numbers of holes and apertures. Among them, the spray hole refers to the gas outlet at the lower end of the flow guide cover, and a variety of flow guide covers of different specifications can be equipped with the device. For example, the drainage cover 200 can be a single hole (aperture of 3 mm), a single hole (aperture of 5 mm), three holes (aperture of 2 mm), and three holes (aperture of 2 mm). By detecting the changes in parameters such as the jet penetration distance and injection amount of hydrogen when using different drainage covers, performance data can be obtained for researchers to make decisions.

[0035] In this embodiment, if Figure 4 As shown, it can be understood that the cam 800 can also be replaced by a piston or other similar device, and the cam 800 is only used as a reference here. The elastic member 700 is a reset device for the needle valve 300. When the lift of the needle valve 300 is driven by the cam 800, the elastic member 700 is compressed and stores a part of the energy. After the cam 800 rotates, the elastic member 700 relaxes to close the needle valve 300. In this way, the reciprocating cycle achieves the purpose of normal operation of the needle valve 300. The sealing cap 400 is arranged on the boss 140, and the inner wall of the sealing cap 400 is provided with a groove 410 for matching with the ridge 141 on the outer wall of the boss 140. The diameter is installed with a self-tightening spring or steel wire for sealing the needle valve 300 to prevent leakage of hydrogen. A plurality of mounting holes 150 can also be arranged on the outside of the housing 100 for fixing the device.

[0036] In this embodiment, if Figure 1 and Figure 3 As shown, hydrogen enters the second channel 120 from the intake channel 130 and flows downward uniformly through the second channel 120. At the same time, the cam 800 drives the needle valve 300 to move downward, the needle valve 300 opens, and the hydrogen flows into the guide cover 200 and is sprayed into the cylinder through the spray hole of the guide cover 200. Subsequently, due to the reset effect of the spring 700, the needle valve 300 is driven to move upward and the needle valve 300 is closed. In this reciprocating cycle, the normal operation of the injector can be achieved.

[0037] In the embodiment of the present application, the hardware performance of the device can be conveniently adjusted through several detachable connected components provided by the device, so as to facilitate the study and verification of the overall impact of different hardware parameters of the hydrogen injection system on the system performance; the cam drive component provided facilitates the study of the jet characteristics of the outward-opening direct-injection hydrogen nozzle, and solves the problem that the injection volume per unit time of the existing hydrogen injector needs to be improved. Through the experiments conducted using the device provided by the present application, it is possible to effectively verify and obtain how to increase the injection volume of the hydrogen direct-injection hydrogen engine per unit time, thereby improving the working efficiency of the engine.

[0038] In a preferred embodiment, the clamping member is detachably clamped with the needle valve 300 via a locking clamp 500;

[0039] The locking clamp 500 includes a first half locking clamp and a second half locking clamp, both of which are embedded in the needle valve 300 and clamped together to form an annular platform; the elastic member 700 is provided with a pre-tightening force; the clamping member 600 is provided with a concave table surface, which abuts against the outer wall of the annular platform to limit the clamping member 600.

[0040] In this embodiment, preferably, the outer edge of the clamping member fits with the wall surface of the first channel 110, which has a sealing effect. At the same time, the inner conical surface of the clamping member, i.e., the concave table surface, fits tightly with the outer conical surface of the locking clip 500, which also has a certain degree of sealing effect. Therefore, the leakage of hydrogen in the first channel 110 can be reduced.

[0041] In this embodiment, the inner conical surface of the clamping member 600 fits tightly with the outer conical surface of the locking clamp, transmitting the force of the elastic member 700 when resetting to the locking clamp 500, thereby driving the needle valve 300 to move upward to achieve resetting, while reducing the leakage of hydrogen in the first channel 110.

[0042] In the embodiment of the present application, in order to facilitate assembly and replacement of the elastic member or change the preload force of the elastic member, the clamping member can be provided on the needle valve 300 as follows: Figure 2 Several plug-in slots 320 as shown, or as Figure 3 The several annular grooves shown are connected to the needle valve 300 .

[0043] In this embodiment, if Figure 1As shown, the spring has a certain pre-tightening force during assembly, and the clamping piece and the spring upper seat are combined together by the pressing force between the two. When the cam does not drive the needle valve to move downward, the clamping piece is subjected to the force of the spring and gives the lock clamp 500 an upward pressing force, so that the two are combined together; when the cam drives the needle valve to move downward, the lock clamp 500 moves downward with the needle valve 300 and gives the clamping piece a downward pressing force, and the spring upper seat is subjected to the force of the spring and gives the lock clamp an upward pressing force, so that the two are combined together.

[0044] In a preferred embodiment, if Figure 1 As shown, the sealing cap 400 is also connected to an annular fastener, and the annular fastener is used to press the sealing cap 400 tightly onto the needle valve 300, and the cone head 310 has an angle of 90 degrees.

[0045] In the embodiment of the present application, the annular fastener can be a device such as a retaining spring buckle, which is convenient for replacement and installation. A large number of simulation experiments have shown that after a comprehensive evaluation of different cone head opening angle models, it is found that the model with a cone head opening angle of 90° performs best. This model is more uniform in terms of force and effectively reduces stress concentration. During the opening and closing process of the valve, the response delay is significantly shortened, and it can respond to the control signal more quickly, which has a positive effect on increasing the amount of hydrogen injection and helps to optimize the performance of related systems.

[0046] In a preferred embodiment, the first channel 110 and the second channel 120 are both cylindrical cavities, and the central axis of the first channel 110 and the central axis of the second channel 120 are collinear.

[0047] In the embodiment of the present application, the above arrangement makes the device structure symmetrical and reduces the interference of irrelevant variables.

[0048] In a preferred embodiment, the inner wall of the second channel 120 is further provided with an annular drainage groove 121 , which is connected to the air inlet channel 130 , so that the gas entering the device through the air inlet channel 130 flows evenly toward the outlet in the second channel 120 .

[0049] In the embodiments of the present application, Figure 3 As shown, the annular guide groove 121 can make the flow of gas more uniform.

[0050] In a preferred embodiment, a method for optimizing a hydrogen injector is provided, the method comprising:

[0051] Construct a physical model of the hydrogen injector optimization device as described above, and based on the physical properties of the physical model, construct a digital calculation model corresponding to the physical model in a simulation platform; change the performance parameters of the digital calculation model to obtain the influence of the change of the performance parameters on the gas jet characteristics; based on the gas jet characteristics, obtain the optimal configuration parameters of the system; adjust the physical model based on the optimal configuration parameters to obtain an optimized hydrogen injection device.

[0052] In an embodiment of the present application, steps of a method for optimizing a device are provided, and the method can be used to optimize the parameters of the device. Through this method, researchers can clearly know the influence of changing various parameters in the device of the injection system, such as the intake pressure of the air inlet, the elasticity of the elastic member, the preload force and other factors, on the overall hydrogen injection device, so as to obtain the optimal parameters. Moreover, based on the entity model provided in the present method, the performance of the parameters of each module can be changed in a digital way. For example, the variables of certain modules in the model can be assigned fixed values ​​based on actual needs, and then the influence of changes in other variables in the model on the overall performance of the device can be studied and analyzed, so as to obtain the entity model with the best performance.

[0053] In a preferred embodiment, the performance parameters of the digital computing model include one or more of the following parameters:

[0054] The hydrogen supply pressure of the hydrogen introduced into the intake passage, the mass of the needle valve, the stiffness of the elastic part, the size of the preload force of the elastic part, the hole area of ​​the spray hole and the number of the spray holes.

[0055] In this embodiment, since the digital model adopts digital modeling, the performance values ​​of the variables in each component can be adjusted conveniently.

[0056] like Figure 5 As shown, a schematic diagram of a digital computing model is given. In an embodiment of the present application, the digital computing model includes:

[0057] A cam drive module and a hydrogen injector module; the cam drive module and the hydrogen injector module are connected via a high-pressure oil circuit; the cam drive module comprises a cam model and a hydraulic piston, the cam model drives the hydraulic piston to reciprocate linearly by continuous rotation, so that the hydraulic oil is compressed to form high-pressure oil, and the high-pressure oil is introduced into the hydrogen injector module through the high-pressure oil circuit; the hydrogen injector module comprises a needle valve, a return spring, a hydrogen gas source inlet end and a high-pressure oil inlet end; the needle valve is used to simulate a cone valve, and the return spring is used to provide a warning force to press the needle valve against the valve seat when the hydrogen injector is not working.

[0058] In one embodiment of the present application, Figure 5As shown in the figure, a specific construction method of a digital model is given. This model divides the hydrogen injection device into two relatively independent modules, namely the cam drive module and the hydrogen injector module, so as to analyze, record and change the various variable parameters in the model. The two modules are organically connected. Among them, the cam drive module is composed of components such as a cam model, a high-pressure oil pump, an oil tank, a pressure regulating valve, an accumulator, an external hydraulic oil pipeline, a control chamber, a hydraulic piston, etc., which can also include several measurement component models, which are not listed here. The above-mentioned device sub-units together constitute the cam drive module of the model. The cam drive module generates high-pressure oil by simulating the cam and introduces the high-pressure oil into the hydrogen injector module through the valve block. When the cam is working, the low-pressure oil in the low-pressure oil tank is continuously pressurized into high-pressure hydraulic oil. The high-pressure hydraulic oil acting on the hydraulic piston overcomes the preload of the return spring to open the needle valve. Among them, the spring of the cam drive module restores the components that are displaced under the action of the cam to their original positions.

[0059] In one embodiment of the present application, the hydrogen injector module may include: a return spring, a tappet piston chamber, a needle valve body, an internal hydraulic oil circuit of the hydrogen injector, a hydrogen nozzle, a control chamber, a hydrogen injector spray hole, a limit baffle, a leakage valve, a feedback force and a pressure sensor and other components. Among them, in order to match the continuous process of the valve opening and closing of the model, the set return spring plays the role of driving the element to return to the starting position. The use of the SPR000A spring is more in line with the study of the influence of the basic characteristics of the return spring on the final hydrogen injection amount during the simulation process, reflecting the simplicity of the experimental process and making it easier to draw targeted conclusions. The needle valve is used to simulate the valve lift in the actual hydrogen injector structure. The PNAP025 cone valve can be used. The cone valve can embody the outward-opening hydrogen injection method in the physical structure, and the sealing is improved by using the form of a bevel seal, which is conducive to the study of the hydrogen injection effect. The cam rotates continuously, driving the piston to perform reciprocating linear motion, thereby causing the hydraulic oil inside the hydrogen injector to be compressed to form a hydraulic oil with high pressure. The spray hole of the hydrogen injector is used to simulate the drainage cover part in the physical model. It is mainly used to promote a more uniform distribution of hydrogen in the cylinder, avoid lean combustion, effectively improve gas utilization efficiency, and optimize overall work efficiency. The use of the limit baffle can limit the opening of the cone valve to a certain extent, and at the same time, it can more intuitively reflect the displacement during the driving process, which is easy to compare with the opening state of the cone valve. The leakage valve is used to simulate the leakage of hydraulic oil in the actual model. The BAF003 model can be used, which is easy to monitor the real-time situation of the transmission process. Compared with other leakage valves in the hydraulic component design library, it takes into account more various characteristics when using high-pressure oil as the transmission medium, and is more convenient for calculating wall compliance, that is, viscous friction. The air hole is used to simulate the drainage cover part in the physical model design, which can control the direction of hydrogen injection into the combustion chamber and the concentration of each layer, avoid lean combustion during use, and improve the combustion efficiency of the hydrogen injector used in the engine. The cone valve is used to simulate the outward-opening hydrogen injection mode of the physical design. The bevel seal improves the sealing of the system, matches the opening angle and various channels in the physical model, and is convenient for modifying parameters for more appropriate simulation experiments, providing more reliable parameters for further physical experimental verification, which is conducive to the study of hydrogen injection effect. For feedback force and pressure sensor, the vehicle-mounted ECU can use the pressure sensor to timely sense the hydrogen injection volume per unit time in the process of valve opening and closing in the form of feedback force, and apply appropriate force to adjust the effects of the three forces of oil supply pressure, spring elastic force and hydrogen supply pressure, and timely adjust some abnormal working conditions that may occur in the system during operation, which plays a certain stabilizing role, realizes the self-adaptation and learning of the system, and greatly enhances the precise control and automation of hydrogen injectors. The drive mode of the injector is cam hydraulic drive. The driving medium in the hydraulic system directly uses the engine oil in the engine, and the modification process is simple and convenient.This design effectively saves the internal space of the engine, making the overall structure more compact and reasonable, improving space utilization while also enhancing the system's integration and stability. The control valve for the oil supply passage switch in the digital calculation model can be optimized to be controlled by a solenoid valve, which can close the oil supply passage in advance, more flexibly and accurately control the oil supply pressure, and realize a highly flexible control strategy for the hydrogen injector.

[0060] In one embodiment of the present application, Figure 6 The tappet piston chamber part in the model shown can be divided into the following Figure 7 (a) and Figure 7 (b) shows two sub-models, Figure 7 (b) The sub-model has a return spring. This model can be used to easily calculate the combined external force of pressure and spring force. Figure 7 (b) BAP016 can be used. Its built-in reset spring can reduce the difficulty of logical judgment of the entire simulation model and improve the simulation accuracy. During the simulation process, its piston diameter plays a positive correlation with the amount of hydrogen injection per unit time. When the hydrogen injector is not working, the reset spring provides a preload to press the needle valve against the valve seat and stop injecting hydrogen; when the hydrogen injector is finished working, the reset spring will press the open needle valve back onto the valve seat. Based on this model, the impact of changing the performance parameters of the component on the overall working performance can be explored.

[0061] In one embodiment, the digital computing model further includes a control cavity, which can be Figure 5 The "Cp" element shown can use the PNCH024 sub-model to simulate a four-port air cavity with a fixed volume. Taking into account the heat exchange, the first law of thermodynamics of the open system can be applied to represent the change of internal energy. The control cavity is selected mainly to reduce power consumption. Considering that the frequent opening and closing process of the cone valve may lead to poor energy saving effect, the control cavity can store energy to reduce the energy consumed when the system starts and stops, thereby saving energy and reducing costs.

[0062] In a preferred embodiment, the limit baffle is fixedly connected to the cone valve. In this embodiment, the cone valve is first used to simulate the actual opening and closing state of the valve. Secondly, considering the many factors that may cause the opening degree of the cone valve to be uncontrollable in actual use, the limit baffle is connected to the cone valve, which can not only limit the cone valve displacement to be too large or too small and cause uncontrollable situations, but also ensure the safety of the system design. In addition, the same input and output of the displacement between the two means that when there is a problem with the valve lift, the limit baffle can be used as a limit, which is convenient for troubleshooting and finding the root cause of the problem.

[0063] Preferably, the digital calculation model also includes: a feedback force providing module, which is used to obtain the hydrogen injection amount per unit time, and based on the hydrogen injection amount per unit time, feedback adjust the return spring force in the hydrogen injector module, the oil supply pressure of the high-pressure oil and the hydrogen supply pressure.

[0064] In the embodiments of the present application, Figure 8 As shown in the figure, the digital calculation model also includes a feedback force providing module. In the process of opening and closing the cone valve, the effects of the return spring force, the hydraulic oil supply pressure and the hydrogen supply pressure are mainly considered. The feedback force factor can be added to timely sense the hydrogen injection volume per unit time during the opening and closing of the valve, and apply an appropriate force to adjust the effects of the above three forces, and timely adjust some abnormal working conditions that may occur in the system during the working process, which plays a certain stabilizing role. Feedback force refers to the reaction force of the force or torque applied by the system to the actuator, which is usually generated by changes in the external environment. It plays a certain regulating and stabilizing role on the system itself and is a key factor in achieving high-precision control. This system realizes the opening and closing of the valve through the combined action of hydrogen supply pressure, oil supply pressure and return spring force, and monitors the real-time hydrogen injection volume through the air pressure flow sensor after the valve is opened. When abnormal working conditions or transitions between different working conditions occur, the feedback force generates different forces to adjust the opening and closing of the valve through the changes in the air pressure flow sensor, thereby achieving stable operation of the system. The influencing factors of feedback force include load characteristics, friction, inertia, external environmental forces, hydraulic system characteristics, control system characteristics, mechanical structure characteristics, working conditions and simulation model accuracy. In hydraulic simulation, these factors need to be considered comprehensively to accurately simulate the feedback force and optimize the system performance. The hydrogen injection amount required by the engine under different working conditions is different, and the corresponding cam speed is also different. In order to eliminate the influence of the change of the corresponding cam speed on the response delay of the valve opening and closing during the transition process of the engine under different working conditions, the feedback force is used to output different feedback forces to act on the opening and closing of the valve according to the change of hydrogen injection amount, and then balance the response delay caused by the change of cam speed, so as to improve the responsiveness of the whole system. Considering that the return spring has the effect of slow rebound as the number of uses increases, thereby increasing the response delay of the valve opening and closing, adding the feedback force factor can timely adjust the opening and closing of the valve by outputting different feedback forces according to the change of hydrogen injection amount, balance the delay caused by the slow rebound of the return spring, and improve the dynamic response, stability and control accuracy of the system.

[0065] As an embodiment of the present application, through a single factor analysis method, the influence of the following variables on the overall performance of the system can be obtained based on the above digital calculation model:

[0066] The influence of hydrogen pressure on system performance: As the hydrogen supply pressure increases, the valve lift also increases. As the hydrogen supply pressure increases, the hydrogen injection volume also increases.

[0067] The influence of spring stiffness and preload on system performance: As spring stiffness increases, valve lift decreases, and as preload increases, valve lift decreases. As spring stiffness increases, hydrogen injection volume decreases. As spring preload increases, hydrogen injection volume decreases.

[0068] The influence of needle valve mass on system performance: As the mass of the mass block increases, the valve lift size decreases. As the valve lift increases, the amount of hydrogen injection increases.

[0069] Influence of the tappet piston cavity piston diameter: As the control cavity diameter increases, the valve lift increases. As the control cavity diameter increases, the hydrogen injection volume increases.

[0070] Influence of hydrogen supply pressure: Under certain conditions of rod diameter, hole diameter, cone valve diameter, hydrogen supply pressure, and control chamber piston diameter, when the preload reaches the critical condition, the valve cannot be opened. The critical value of the valve being unable to open is used to limit the use conditions of the model, that is, to limit the preload conditions under which it can be used normally. Exceeding this range may damage the device and prevent it from working normally.

[0071] Figure 6 The internal structure diagram of a computer device in one embodiment is shown. The computer device includes a processor, a memory, a network interface, an input device and a display screen connected via a system bus. Among them, the memory includes a non-volatile storage medium and an internal memory. The above-mentioned digital model, or a simulation operation method of the model may be stored in the memory. The non-volatile storage medium of the computer device stores an operating system and may also store a computer program, which, when executed by the processor, enables the processor to implement the hydrogen injector optimization method. The internal memory may also store a computer program, which, when executed by the processor, enables the processor to execute the hydrogen injector optimization method.

[0072] Those skilled in the art will understand that Figure 5 or Figure 6 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the model to which the scheme of the present application is applied. The specific model or system may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0073] In one embodiment, one or more steps in the hydrogen injector optimization method provided in the present application can be implemented in the form of a computer program. The computer program can be used in Figure 6The computer device shown in the figure is run. The memory of the computer device may store program modules constituting the various steps of the hydrogen injector optimization method. The computer program composed of various program modules enables the processor to execute the steps of the hydrogen injector optimization method of various embodiments of the present application described in this specification.

[0074] It should be understood that, although each step in the flow chart of each embodiment of the present application is shown in sequence according to the indication of the arrow, these steps are not necessarily performed in sequence according to the order indicated by the arrow. Unless there is clear explanation in this article, the execution of these steps does not have strict order restriction, and these steps can be performed in other orders. Moreover, at least a portion of the steps in each embodiment may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and the execution order of these sub-steps or stages is not necessarily performed in sequence, but can be performed in turn or alternately with at least a portion of other steps or sub-steps or stages of other steps.

[0075] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory.

[0076] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A hydrogen injector optimization device, characterized in that: The device comprises: Housing, needle valve, drainage cover and cam; A first channel and a second channel are provided inside the housing, a boss is provided between the first channel and the second channel to separate the first channel and the second channel, and a side wall of the second channel is connected to an air intake channel; The needle valve is arranged to penetrate the first channel and the second channel; a cone head is arranged at one end of the needle valve, and the cone head is located outside the second channel; a column head is arranged at the other end of the needle valve, and the column head is located outside the first channel and abuts against the cam; An elastic member and a clamping member are provided in the first channel, one end of the elastic member abuts against the housing, and the other end abuts against the clamping member, and the clamping member is clamped and fixed to the needle valve; A sealing cap is also provided in the first channel, the outer wall of the boss is provided with convex ridges, the inner wall of the sealing cap is provided with grooves, the outer wall of the boss is fitted with the inner wall of the sealing cap, and the convex ridges are snap-fitted into the interior of the grooves; a through hole is also provided in the radial center of the sealing cap, the needle valve passes through the through hole and fits with the inner wall of the through hole; The deflector cover is disposed on the outside of the opening of the second channel and is detachably connected to the shell. The deflector cover is provided with a spray hole.

2. A hydrogen injector optimization device according to claim 1, characterized in that: The clamping member is detachably clamped with the needle valve via a locking clamp; The locking clamp comprises a first half locking clamp and a second half locking clamp, wherein the first half locking clamp and the second half locking clamp are both embedded in the needle valve and clamped together to form an annular platform; The elastic member is provided with a pre-tightening force; the clamping member is provided with a concave table surface, and the concave table surface abuts against the outer wall of the annular platform to form a limit for the clamping member.

3. A hydrogen injector optimization device according to claim 1, characterized in that: The sealing cap is also connected to an annular fastener, and the annular fastener is used to press the sealing cap tightly onto the needle valve; The cone head opening angle is 90 degrees.

4. A hydrogen injector optimization device according to claim 1, characterized in that: The first channel and the second channel are both cylindrical cavities, and the central axis of the first channel and the central axis of the second channel are collinear.

5. A hydrogen injector optimization device according to claim 1, characterized in that: The inner wall of the second channel is also provided with an annular drainage groove, which is communicated with the air inlet channel, so that the gas entering the device through the air inlet channel flows evenly toward the outlet in the second channel.

6. A method for optimizing a hydrogen injector, characterized in that: The method comprises: Based on the mechanical properties of the physical model of the hydrogen injector optimization device according to any one of claims 1 to 5, a digital calculation model corresponding to the physical model is constructed in a simulation platform; Changing the performance parameters of the digital calculation model to obtain the influence of the change of the performance parameters on the gas jet characteristics; Based on the gas jet characteristics, optimal configuration parameters of the system are obtained; The physical model is adjusted based on the optimal configuration parameters, and verification is performed based on the physical model to obtain an optimized hydrogen injection device.

7. A hydrogen injector optimization method according to claim 6, characterized in that: The performance parameters of the digital computing model include one or more of the following parameters: The hydrogen supply pressure of the hydrogen introduced into the intake passage, the mass of the needle valve, the stiffness of the elastic part, the size of the preload force of the elastic part, the hole area of ​​the spray hole and the number of the spray holes.

8. The method for optimizing a hydrogen injector according to claim 6, characterized in that: The digital computing model includes: A cam drive module and a hydrogen injector module; the cam drive module and the hydrogen injector module are connected via a high-pressure oil circuit; The cam driving module comprises a cam model and a hydraulic piston, wherein the cam model drives the hydraulic piston to reciprocate and linearly move by continuous rotation, so that the hydraulic oil is compressed to form high-pressure oil, and the high-pressure oil is introduced into the hydrogen injector module through the high-pressure oil circuit; The hydrogen injector module includes a needle valve, a return spring, a hydrogen gas source inlet end and a high-pressure oil inlet end; the needle valve is used to simulate a cone valve, and the return spring is used to provide a warning force to press the needle valve against the valve seat when the hydrogen injector is not working.

9. The method for optimizing a hydrogen injector according to claim 8, characterized in that: The digital computing model also includes: A feedback force providing module is used to obtain the hydrogen injection amount per unit time, and based on the hydrogen injection amount per unit time, feedback adjust the return spring force, the oil supply pressure of the high-pressure oil and the hydrogen supply pressure in the hydrogen injector module.

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