A method and apparatus for controlling hydrogen flow pressure

Abstract

The application discloses a hydrogen flow pressure control method and device, obtains a hydrogen injection parameter; according to the injection parameter, hydrogen is injected into a hydrogen engine to make hydrogen and air mix and combust in the hydrogen engine cylinder; the cylinder pressure in the hydrogen engine cylinder and the oxygen content in the gas discharged by the hydrogen engine are monitored in real time; the injection parameter and the ignition time are corrected according to the cylinder pressure and the oxygen content, the corrected injection parameter and the ignition time are obtained; the injection requirement is determined according to the corrected injection parameter and the ignition time; if the flow and pressure of hydrogen in the hydrogen common rail pipe do not meet the injection requirement, the injection pressure of hydrogen is adjusted until the flow and pressure of hydrogen after adjustment meet the injection requirement. The injection parameter and the ignition time can be corrected in real time according to the cylinder pressure and the oxygen content, so that the flow and pressure of hydrogen in the hydrogen common rail pipe meet the injection requirement, and the stability of fuel supply pressure and flow is ensured.

Description

Technical Field

[0001] This application relates to the field of fuel cell technology, and in particular to a method and apparatus for controlling hydrogen flow and pressure. Background Technology

[0002] As society develops, the petroleum resources used by traditional engines are becoming increasingly scarce. In addition, with the implementation of low-carbon and environmental protection policies, the development of engines that can use clean fuels has begun. The application of hydrogen as a clean fuel in vehicles is mainly divided into hydrogen fuel cells and hydrogen engines.

[0003] Currently, most hydrogen engines use mechanical pressure reduction in their fuel supply systems. The principle behind mechanical pressure reduction is to use a mechanical device to reduce the pressure of high-pressure hydrogen to a suitable level before supplying it to the fuel cell power generation system. However, mechanical pressure reduction has relatively low pressure control precision and is easily affected by external environmental factors such as temperature and humidity, leading to unstable fuel supply pressure and flow.

[0004] Therefore, ensuring the stability of fuel supply pressure and flow has become an urgent problem to be solved in this field. Summary of the Invention

[0005] This application provides a method and apparatus for controlling hydrogen flow and pressure, with the aim of ensuring the stability of fuel supply pressure and flow.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A method for controlling hydrogen flow rate and pressure includes:

[0008] The injection parameters of hydrogen are obtained; the injection parameters include the injection timing and the injection pulse width.

[0009] The hydrogen gas is injected into the hydrogen engine according to the injection parameters so that the hydrogen gas and air are mixed and burned in the cylinder of the hydrogen engine;

[0010] The cylinder pressure inside the hydrogen engine cylinder and the oxygen content in the gas emitted by the hydrogen engine are monitored in real time.

[0011] The injection parameters and ignition timing are corrected based on the cylinder pressure and the oxygen content to obtain the corrected injection parameters and ignition timing; the ignition timing is the moment when hydrogen and air ignite and burn in the cylinder of the hydrogen engine.

[0012] The injection requirements are determined based on the revised injection parameters and ignition timing.

[0013] Determine whether the flow rate and pressure of hydrogen in the hydrogen common rail meet the injection requirements;

[0014] If the flow rate and pressure of hydrogen in the common hydrogen pipeline do not meet the injection requirements, the injection pressure of hydrogen is adjusted until the flow rate and pressure of hydrogen meet the injection requirements.

[0015] Optionally, the step of correcting the injection parameters and ignition timing based on the cylinder pressure and the oxygen content to obtain the corrected injection parameters and ignition timing includes:

[0016] The in-cylinder air-fuel ratio of the hydrogen engine is determined based on the oxygen content.

[0017] The combustion conditions inside the hydrogen engine cylinder are determined based on the cylinder pressure.

[0018] Based on the combustion conditions and the in-cylinder air-fuel ratio, the injection timing, ignition timing, and injection pulse width are corrected to obtain the corrected injection timing, ignition timing, and injection pulse width.

[0019] Optionally, the step of correcting the injection timing, ignition timing, and injection pulse width based on the combustion conditions and the in-cylinder air-fuel ratio to obtain corrected injection timing, ignition timing, and injection pulse width includes:

[0020] When the cylinder pressure is detected to exceed the preset cylinder pressure, it is determined that the combustion condition is knocking in the hydrogen engine;

[0021] The injection timing and ignition timing are adjusted to obtain the corrected injection timing and ignition timing;

[0022] After the injection timing and the ignition timing are adjusted, it is determined whether the in-cylinder air-fuel ratio is consistent with the preset air-fuel ratio.

[0023] If the in-cylinder air-fuel ratio is inconsistent with the preset air-fuel ratio, the injection pulse width is corrected to obtain the corrected injection pulse width.

[0024] Optionally, determining the injection requirements based on the corrected injection parameters and ignition timing includes:

[0025] The current cylinder pressure in the hydrogen engine cylinder is determined based on the injection timing and ignition timing in the corrected injection parameters.

[0026] The current injection quantity of hydrogen is determined based on the injection pulse width in the corrected injection parameters.

[0027] The current cylinder pressure and the current injection quantity of hydrogen are determined as the injection requirements.

[0028] Optionally, determining whether the flow rate and pressure of hydrogen in the hydrogen common rail meet the injection requirements includes:

[0029] Divide the current injection quantity by the injection pulse width in the corrected injection parameters to obtain the current hydrogen flow rate;

[0030] Determine whether the flow rate of hydrogen in the hydrogen common rail is consistent with the current flow rate;

[0031] If the flow rate of hydrogen in the common hydrogen rail is the same as the current flow rate, then determine whether the pressure of hydrogen in the common hydrogen rail is the same as the current cylinder pressure.

[0032] If the pressure of hydrogen in the common rail is inconsistent with the current cylinder pressure, then it is determined that the flow rate and pressure of hydrogen do not meet the injection requirements.

[0033] If the flow rate of hydrogen in the hydrogen common rail is inconsistent with the current flow rate, then it is determined that the flow rate and pressure of hydrogen in the hydrogen common rail do not meet the injection requirements.

[0034] A hydrogen flow rate and pressure control device, comprising:

[0035] A hydrogen injector is used to acquire hydrogen injection parameters, including injection timing and injection pulse width, and to inject the hydrogen into a hydrogen engine according to the injection parameters so that the hydrogen and air are mixed and burned in the cylinder of the hydrogen engine.

[0036] A cylinder pressure sensor is used to monitor the cylinder pressure inside the hydrogen engine cylinder in real time.

[0037] An oxygen sensor is used to monitor the oxygen content in the gas emitted by the hydrogen engine in real time.

[0038] The electronic control unit is used to correct the injection parameters and ignition timing based on the cylinder pressure and the oxygen content to obtain the corrected injection parameters and ignition timing; the ignition timing is the time when hydrogen and air ignite and burn in the cylinder of the hydrogen engine, and is used to determine the injection requirements based on the corrected injection parameters and ignition timing.

[0039] A hydrogen temperature and pressure sensor is used to determine whether the flow rate and pressure of hydrogen in the hydrogen common rail meet the injection requirements.

[0040] A low-pressure electrically controlled pressure regulating valve is used to adjust the hydrogen injection pressure if the flow rate and pressure of hydrogen in the hydrogen common rail do not meet the injection requirements, until the flow rate and pressure of hydrogen meet the injection requirements after adjustment.

[0041] Optionally, the electronic control unit is specifically used for:

[0042] The in-cylinder air-fuel ratio of the hydrogen engine is determined based on the oxygen content.

[0043] The combustion conditions inside the hydrogen engine cylinder are determined based on the cylinder pressure.

[0044] Based on the combustion conditions and the in-cylinder air-fuel ratio, the injection timing, ignition timing, and injection pulse width are corrected to obtain the corrected injection timing, ignition timing, and injection pulse width.

[0045] Optionally, the electronic control unit is specifically used for:

[0046] When the cylinder pressure is detected to exceed the preset cylinder pressure, it is determined that the combustion condition is knocking in the hydrogen engine;

[0047] The injection timing and ignition timing are adjusted to obtain the corrected injection timing and ignition timing;

[0048] After the injection timing and the ignition timing are adjusted, it is determined whether the in-cylinder air-fuel ratio is consistent with the preset air-fuel ratio.

[0049] If the in-cylinder air-fuel ratio is inconsistent with the preset air-fuel ratio, the injection pulse width is corrected to obtain the corrected injection pulse width.

[0050] Optionally, the electronic control unit is specifically used for:

[0051] The current cylinder pressure in the hydrogen engine cylinder is determined based on the injection timing and ignition timing in the corrected injection parameters.

[0052] The current injection quantity of hydrogen is determined based on the injection pulse width in the corrected injection parameters.

[0053] The current cylinder pressure and the current injection quantity of hydrogen are determined as the injection requirements.

[0054] Optionally, the hydrogen temperature and pressure sensor is specifically used for:

[0055] Divide the current injection quantity by the injection pulse width in the corrected injection parameters to obtain the current hydrogen flow rate;

[0056] Determine whether the flow rate of hydrogen in the hydrogen common rail is consistent with the current flow rate;

[0057] If the flow rate of hydrogen in the common hydrogen rail is the same as the current flow rate, then determine whether the pressure of hydrogen in the common hydrogen rail is the same as the current cylinder pressure.

[0058] If the pressure of hydrogen in the common rail is inconsistent with the current cylinder pressure, then it is determined that the flow rate and pressure of hydrogen do not meet the injection requirements.

[0059] If the flow rate of hydrogen in the hydrogen common rail is inconsistent with the current flow rate, then it is determined that the flow rate and pressure of hydrogen in the hydrogen common rail do not meet the injection requirements.

[0060] The technical solution provided in this application obtains hydrogen injection parameters; injects hydrogen into a hydrogen engine according to the injection parameters so that hydrogen and air mix and burn in the hydrogen engine cylinder; monitors the cylinder pressure and oxygen content in the exhaust gas of the hydrogen engine in real time; corrects the injection parameters and ignition timing according to the cylinder pressure and oxygen content to obtain corrected injection parameters and ignition timing; determines the injection requirements based on the corrected injection parameters and ignition timing; if the hydrogen flow rate and pressure in the hydrogen common rail do not meet the injection requirements, the hydrogen injection pressure is adjusted until the adjusted hydrogen flow rate and pressure meet the injection requirements. The injection parameters and ignition timing can be corrected in real time according to the cylinder pressure and oxygen content to ensure that the hydrogen flow rate and pressure in the hydrogen common rail meet the injection requirements, thus ensuring the stability of fuel supply pressure and flow. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0062] Figure 1 A flowchart illustrating a method for controlling hydrogen flow rate and pressure, provided in an embodiment of this application;

[0063] Figure 2 A flowchart illustrating an information correction method provided in this application embodiment;

[0064] Figure 3 A flowchart illustrating another method for correcting information provided in this application embodiment;

[0065] Figure 4 A flowchart illustrating a method for determining spraying requirements as provided in an embodiment of this application;

[0066] Figure 5 A flowchart illustrating a method for determining spray requirements provided in an embodiment of this application;

[0067] Figure 6 A schematic diagram of the control principle of a hydrogen supply system provided in this application embodiment;

[0068] Figure 7 This is a schematic diagram of the architecture of a hydrogen flow and pressure control device provided in an embodiment of this application. Detailed Implementation

[0069] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0070] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0071] like Figure 1 The diagram shown is a flowchart of a hydrogen flow rate and pressure control method provided in an embodiment of this application, applied to a hydrogen supply system, and includes the following steps:

[0072] S101: Obtain the hydrogen injection parameters.

[0073] The injection parameters include injection timing and injection pulse width.

[0074] It should be noted that the electronic control unit outputs parameters according to the operating conditions, that is, the electronic control unit sends execution commands to the hydrogen injector. After receiving the execution commands, the hydrogen injector obtains the hydrogen injection timing and injection pulse width.

[0075] The so-called injection moment is actually the point in time when the hydrogen injector injects hydrogen gas.

[0076] The so-called injection pulse width is actually the length of time that the hydrogen injector injects hydrogen.

[0077] S102: Hydrogen is injected into the hydrogen engine according to the injection parameters so that hydrogen and air are mixed and burned in the hydrogen engine cylinder.

[0078] It should be noted that the hydrogen injector injects hydrogen into the engine cylinder according to the injection timing and injection pulse width, so that the hydrogen and air mix in the hydrogen engine cylinder and start to burn through ignition or pressure auto-ignition. During the combustion process, high temperature and high pressure gas is generated, which drives the piston to move and drives the hydrogen engine to run.

[0079] S103: Real-time monitoring of cylinder pressure in the hydrogen engine cylinder and oxygen content in the exhaust gas of the hydrogen engine.

[0080] It should be noted that the cylinder pressure inside the hydrogen engine cylinder is monitored in real time by a cylinder pressure sensor installed on the hydrogen engine, and the oxygen content in the gas emitted by the hydrogen engine is monitored in real time by an oxygen sensor installed on the exhaust tailpipe.

[0081] S104: The injection parameters and ignition timing are corrected based on cylinder pressure and oxygen content to obtain the corrected injection parameters and ignition timing.

[0082] The ignition moment is the moment when hydrogen and air ignite and burn inside the cylinder of a hydrogen engine.

[0083] Understandably, adjusting injection parameters and ignition timing based on cylinder pressure and oxygen content allows for better mixing of hydrogen and air, resulting in a more stable combustion state. Adjusting ignition timing ensures accurate combustion initiation; ignition too early or too late leads to incomplete or abnormal combustion, thus affecting the hydrogen engine's performance. By modifying injection parameters and ignition timing, the combustion process of a hydrogen engine can be optimized, improving its efficiency, performance, and reliability, ultimately achieving better power output.

[0084] It should be noted that the electronic control unit (ECU) makes real-time corrections to the injection parameters and ignition timing based on cylinder pressure and oxygen content, so that the corrected injection parameters and ignition timing meet subsequent requirements.

[0085] Optionally, in another embodiment of this application, the specific implementation of step S104 is as follows: Figure 2 As shown, it includes the following steps:

[0086] S201: Determine the in-cylinder air-fuel ratio of a hydrogen engine based on its oxygen content.

[0087] Specifically, the in-cylinder air-fuel ratio of the hydrogen engine is determined based on the oxygen content. Specifically, the difference between a preset value (e.g., 1) and the oxygen content is calculated to obtain the hydrogen content in the gas; the hydrogen content is divided by the oxygen content to obtain the in-cylinder air-fuel ratio.

[0088] S202: Determine the combustion conditions inside the cylinder of the hydrogen engine based on cylinder pressure.

[0089] The combustion status within the hydrogen engine cylinder is determined based on cylinder pressure. Specifically, when the cylinder pressure exceeds the average cylinder pressure, the combustion status is determined to be sufficient; when the cylinder pressure does not exceed the average cylinder pressure, the combustion status is determined to be poor.

[0090] S203: Based on the combustion conditions and the air-fuel ratio in the cylinder, the injection timing, ignition timing, and injection pulse width are corrected to obtain the corrected injection timing, ignition timing, and injection pulse width.

[0091] Understandably, it is necessary to determine whether the combustion conditions and the air-fuel ratio in the cylinder meet the set requirements. If they do not meet the set requirements, the injection timing, ignition timing, and injection pulse width need to be corrected so that the corrected injection timing, ignition timing, and injection pulse width meet the set requirements.

[0092] Optionally, in another embodiment of this application, the specific implementation of step S203 is as follows: Figure 3 As shown, it includes the following steps:

[0093] S301: When the cylinder pressure is detected to exceed the preset cylinder pressure, the combustion condition is determined to be knocking in the hydrogen engine.

[0094] It is understandable that when the cylinder pressure sensor detects that the cylinder pressure exceeds the preset cylinder pressure, it means that the combustion inside the hydrogen engine is violent (i.e., knocking combustion), and the combustion situation is determined to be knocking combustion in the hydrogen engine.

[0095] S302: Adjust the injection timing and ignition timing to obtain the corrected injection timing and ignition timing.

[0096] When the cylinder pressure sensor detects knocking in the hydrogen engine, it needs to send the knocking information to the electronic control unit (ECU). The ECU then adjusts the injection and ignition timings, specifically by delaying the injection and ignition timings, to reduce the probability of knocking in the hydrogen engine.

[0097] S303: After the injection timing and ignition timing are adjusted, determine whether the in-cylinder air-fuel ratio is consistent with the preset air-fuel ratio.

[0098] If the in-cylinder air-fuel ratio is inconsistent with the preset air-fuel ratio, then proceed to step S304.

[0099] The preset air-fuel ratio is the air-fuel ratio pre-set by the electronic control unit.

[0100] Specifically, assuming the in-cylinder air-fuel ratio is 1:5 and the preset air-fuel ratio is 1:4, determine whether the in-cylinder air-fuel ratio is consistent with the preset air-fuel ratio. Obviously, the in-cylinder air-fuel ratio is inconsistent with the preset air-fuel ratio. Therefore, continue to execute step S304.

[0101] It should be noted that if the in-cylinder air-fuel ratio is the same as the preset air-fuel ratio, it means that the in-cylinder air-fuel ratio meets the set requirements, and there is no need to adjust the in-cylinder air-fuel ratio.

[0102] S304: Correct the injection pulse width to obtain the corrected injection pulse width.

[0103] It is understandable that the injection pulse width is corrected by the hydrogen injector, which means adjusting the amount of hydrogen injected, so as to achieve the goal of matching the in-cylinder air-fuel ratio with the preset air-fuel ratio by changing the injection amount.

[0104] S105: Determine the injection requirements based on the revised injection parameters and ignition timing.

[0105] The injection requirements include the injection volume and pressure of hydrogen.

[0106] It should be noted that the injection requirements are determined based on the corrected injection parameters and ignition timing, which means determining the injection quantity and pressure of hydrogen based on the corrected injection parameters and ignition timing.

[0107] Optionally, in another embodiment of this application, the specific implementation of step S105 is as follows: Figure 4 As shown, it includes the following steps:

[0108] S401: Determine the current cylinder pressure in the hydrogen engine cylinder based on the injection timing and ignition timing in the corrected injection parameters.

[0109] Understandably, the current cylinder pressure in the hydrogen engine cylinder is determined based on the injection timing and ignition timing in the corrected injection parameters. Specifically, after injecting hydrogen into the hydrogen engine according to the injection timing and ignition timing in the corrected injection parameters, the current cylinder pressure of the hydrogen engine can be detected by the cylinder pressure sensor.

[0110] S402: Determine the current injection quantity of hydrogen based on the injection pulse width in the corrected injection parameters.

[0111] Specifically, the current hydrogen injection quantity is determined based on the injection pulse width in the corrected injection parameters. Specifically, the current hydrogen injection quantity is obtained by multiplying the injection pulse width (i.e., the injection duration) with the injection quantity for a preset time (e.g., the injection quantity for 1 second).

[0112] S403: Determine the current cylinder pressure and current hydrogen injection quantity as the injection requirement.

[0113] S106: Determine whether the flow rate and pressure of hydrogen in the hydrogen common rail meet the injection requirements.

[0114] If the flow rate and pressure of hydrogen in the hydrogen common rail do not meet the injection requirements, then proceed to step S107.

[0115] It should be noted that the flow rate and pressure of hydrogen in the common rail are monitored by hydrogen temperature and pressure sensors to ensure that they meet the injection requirements.

[0116] It should be noted that the flow rate and pressure of hydrogen in the common rail are monitored by hydrogen temperature and pressure sensors to ensure that they meet the injection requirements. If the flow rate and pressure of hydrogen in the common rail meet the injection requirements, it means that there is no need to adjust the hydrogen injection pressure at this time.

[0117] Optionally, in another embodiment of this application, the specific implementation of step S106 is as follows: Figure 5 As shown, it includes the following steps:

[0118] S501: Divide the current injection quantity by the injection pulse width in the corrected injection parameters to obtain the current hydrogen flow rate.

[0119] The current injection quantity is divided by the injection pulse width in the corrected injection parameters to obtain the specific expression of the current hydrogen flow rate, as shown in formula (1).

[0120] Current flow rate = Current injection quantity / Injection pulse width in the corrected injection parameters (1)

[0121] S502: Determine whether the flow rate of hydrogen in the hydrogen common rail is consistent with the current flow rate.

[0122] If the hydrogen flow rate in the common hydrogen pipeline is the same as the current flow rate, then proceed to step S503; if the hydrogen flow rate in the common hydrogen pipeline is different from the current flow rate, then proceed to step S504.

[0123] Specifically, assuming the hydrogen flow rate in the common rail is 100 standard liters per minute (SLM) and the current flow rate is 100 SLM, determine whether the hydrogen flow rate in the common rail is consistent with the current flow rate. Obviously, the hydrogen flow rate in the common rail is consistent with the current flow rate. Therefore, continue to execute step S503.

[0124] Specifically, assuming the hydrogen flow rate in the common rail is 100 SLM and the current flow rate is 90 SLM, determine whether the hydrogen flow rate in the common rail is consistent with the current flow rate. Obviously, the hydrogen flow rate in the common rail is consistent with the current flow rate. Therefore, continue to execute step S504.

[0125] S503: Determine whether the hydrogen pressure in the hydrogen common rail is consistent with the current cylinder pressure.

[0126] If the hydrogen pressure in the common rail is inconsistent with the current cylinder pressure, then proceed to step S504.

[0127] Specifically, assuming the hydrogen pressure in the common rail is 10 MPa and the current cylinder pressure is 15 MPa, determine whether the hydrogen pressure in the common rail is consistent with the current cylinder pressure. Obviously, the hydrogen pressure in the common rail is inconsistent with the current cylinder pressure. Therefore, continue to execute step S504.

[0128] S504: It has been determined that the flow rate and pressure of hydrogen in the common rail do not meet the injection requirements.

[0129] It is understandable that if the hydrogen flow rate in the common rail is inconsistent with the current flow rate, or if the hydrogen pressure in the common rail is inconsistent with the current cylinder pressure, it is determined that the hydrogen flow rate and pressure in the common rail do not meet the injection requirements.

[0130] S107: Adjust the hydrogen injection pressure until the adjusted flow rate and pressure meet the injection requirements.

[0131] It should be noted that the injection pressure of hydrogen is adjusted by the low-pressure electronically controlled pressure regulating valve until the adjusted flow rate and pressure meet the injection requirements.

[0132] In summary, the injection parameters and ignition timing are corrected based on cylinder pressure and oxygen content to obtain corrected injection parameters and ignition timing. Injection requirements are then determined based on these corrected parameters and timing. It is then assessed whether the hydrogen flow rate and pressure in the common rail meet the injection requirements. If the hydrogen flow rate and pressure in the common rail do not meet the injection requirements, the hydrogen injection pressure is adjusted until the adjusted flow rate and pressure meet the requirements. In this embodiment, under the influence of external factors, the injection parameters and ignition timing can be corrected in real time based on cylinder pressure and oxygen content, ensuring that the hydrogen flow rate and pressure in the common rail meet the injection requirements and guaranteeing the stability of fuel supply pressure and flow.

[0133] like Figure 6 The diagram shown is a schematic diagram of the control principle of a hydrogen supply system provided in an embodiment of this application. The hydrogen supply system includes: an electronic control unit, a high-pressure pressure reducer, a low-pressure electronically controlled pressure regulating valve, a hydrogen common rail, hydrogen injection, a hydrogen engine, and an exhaust tailpipe.

[0134] A1: The electronic control unit sends a hydrogen injection command to the hydrogen injector.

[0135] The injection command includes the injection timing and injection pulse width.

[0136] A2: When a jetting command is received, the hydrogen injector injects hydrogen into the hydrogen engine according to the jetting time and jetting pulse width.

[0137] A3: The cylinder pressure sensor on the hydrogen engine monitors the cylinder pressure inside the hydrogen engine cylinder in real time.

[0138] A4: The oxygen sensor on the exhaust tailpipe monitors the oxygen content in the gas emitted by the hydrogen engine in real time.

[0139] A5: The electronic control unit corrects the injection parameters and ignition timing based on cylinder pressure and oxygen content to obtain the corrected injection parameters and ignition timing.

[0140] A6: The electronic control unit determines the injection requirements based on the corrected injection parameters and ignition timing.

[0141] A7: The hydrogen temperature and pressure sensor monitors whether the flow rate and pressure of hydrogen in the hydrogen common rail meet the injection requirements.

[0142] If the flow rate and pressure of hydrogen in the hydrogen common rail do not meet the injection requirements, then proceed to step A7.

[0143] A8: The high-pressure reducing valve reduces the oxygen pressure in the oxygen cylinder to the range required by the low-pressure electrically controlled pressure regulating valve.

[0144] A9: The low-pressure electronically controlled pressure regulating valve adjusts the pressure of hydrogen in the hydrogen common rail according to the needs of the hydrogen injector until the adjusted flow rate and pressure meet the injection requirements.

[0145] In summary, the hydrogen temperature and pressure sensor monitors whether the flow rate and pressure of hydrogen in the common rail meet the injection requirements. If the flow rate and pressure of hydrogen in the common rail do not meet the injection requirements, the high-pressure reducing valve reduces the oxygen pressure in the oxygen cylinder to the range required by the low-pressure electronically controlled regulating valve. The low-pressure electronically controlled regulating valve adjusts the pressure of hydrogen in the common rail according to the needs of the hydrogen injector until the adjusted flow rate and pressure meet the injection requirements. In this embodiment, the injection parameters and ignition timing can be corrected in real time based on cylinder pressure and oxygen content, ensuring that the flow rate and pressure of hydrogen in the common rail meet the injection requirements and guaranteeing the stability of fuel supply pressure and flow.

[0146] like Figure 7 The diagram shown is a schematic of the architecture of a hydrogen flow and pressure control device provided in an embodiment of this application. The control device includes: a hydrogen injector 100, a cylinder pressure sensor 200, an oxygen sensor 300, an electronic control unit 400, a hydrogen temperature and pressure sensor 500, and a low-pressure electronically controlled pressure regulating valve 600.

[0147] Hydrogen injector 100 is used to acquire hydrogen injection parameters, including injection timing and injection pulse width, and to inject hydrogen into the hydrogen engine according to the injection parameters so that hydrogen and air can be mixed and burned in the hydrogen engine cylinder.

[0148] Cylinder pressure sensor 200 is used to monitor cylinder pressure in the hydrogen engine cylinder in real time.

[0149] The oxygen sensor 300 is used to monitor the oxygen content in the gas emitted by the hydrogen engine in real time.

[0150] The electronic control unit 400 is used to correct the injection parameters and ignition timing based on cylinder pressure and oxygen content to obtain the corrected injection parameters and ignition timing; the ignition timing is the time when hydrogen and air ignite and burn in the cylinder of the hydrogen engine, and is used to determine the injection requirements based on the corrected injection parameters and ignition timing.

[0151] The electronic control unit 400 is specifically used to: determine the in-cylinder air-fuel ratio of the hydrogen engine based on the oxygen content; determine the combustion conditions in the cylinder of the hydrogen engine based on the cylinder pressure; and correct the injection timing, ignition timing, and injection pulse width based on the combustion conditions and the in-cylinder air-fuel ratio to obtain the corrected injection timing, ignition timing, and injection pulse width.

[0152] The electronic control unit 400 is specifically used for: determining that the combustion condition is knocking in the hydrogen engine when the cylinder pressure exceeds the preset cylinder pressure; adjusting the injection timing and ignition timing to obtain the corrected injection timing and ignition timing; after the injection timing and ignition timing are adjusted, determining whether the in-cylinder air-fuel ratio is consistent with the preset air-fuel ratio; if the in-cylinder air-fuel ratio is inconsistent with the preset air-fuel ratio, correcting the injection pulse width to obtain the corrected injection pulse width.

[0153] The electronic control unit 400 is specifically used to: determine the current cylinder pressure in the hydrogen engine cylinder based on the injection timing and ignition timing in the corrected injection parameters; determine the current hydrogen injection quantity based on the injection pulse width in the corrected injection parameters; and determine the current cylinder pressure and the current hydrogen injection quantity as the injection requirements.

[0154] The hydrogen temperature and pressure sensor 500 is used to determine whether the flow rate and pressure of hydrogen in the hydrogen common rail meet the injection requirements.

[0155] The hydrogen temperature and pressure sensor 500 is specifically used for: dividing the current injection quantity by the injection pulse width in the corrected injection parameters to obtain the current hydrogen flow rate; determining whether the hydrogen flow rate in the common rail is consistent with the current flow rate; if the hydrogen flow rate in the common rail is consistent with the current flow rate, determining whether the hydrogen pressure in the common rail is consistent with the current cylinder pressure; if the hydrogen pressure in the common rail is inconsistent with the current cylinder pressure, determining that the hydrogen flow rate and pressure do not meet the injection requirements; if the hydrogen flow rate in the common rail is inconsistent with the current flow rate, determining that the hydrogen flow rate and pressure in the common rail do not meet the injection requirements.

[0156] The low-pressure electrically controlled pressure regulating valve 600 is used to adjust the hydrogen injection pressure if the flow rate and pressure of hydrogen in the hydrogen common rail do not meet the injection requirements, until the flow rate and pressure of hydrogen meet the injection requirements after adjustment.

[0157] In summary, the hydrogen temperature and pressure sensor monitors whether the flow rate and pressure of hydrogen in the common rail meet the injection requirements. If the flow rate and pressure of hydrogen in the common rail do not meet the injection requirements, the high-pressure reducing valve reduces the oxygen pressure in the oxygen cylinder to the range required by the low-pressure electronically controlled regulating valve. The low-pressure electronically controlled regulating valve adjusts the pressure of hydrogen in the common rail according to the needs of the hydrogen injector until the adjusted flow rate and pressure meet the injection requirements. In this embodiment, the injection parameters and ignition timing can be corrected in real time based on cylinder pressure and oxygen content, ensuring that the flow rate and pressure of hydrogen in the common rail meet the injection requirements and guaranteeing the stability of fuel supply pressure and flow.

[0158] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. In particular, for system or system embodiments, since they are fundamentally similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. Components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0159] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0160] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling hydrogen flow rate and pressure, characterized in that, include: Obtain the hydrogen injection parameters; The injection parameters include injection timing and injection pulse width; The hydrogen gas is injected into the hydrogen engine according to the injection parameters so that the hydrogen gas and air are mixed and burned in the cylinder of the hydrogen engine; The cylinder pressure inside the hydrogen engine cylinder and the oxygen content in the gas emitted by the hydrogen engine are monitored in real time. The injection parameters and ignition timing are corrected based on the cylinder pressure and the oxygen content to obtain the corrected injection parameters and ignition timing; the ignition timing is the moment when hydrogen and air ignite and burn in the cylinder of the hydrogen engine. The injection requirements are determined based on the revised injection parameters and ignition timing. Determine whether the flow rate and pressure of hydrogen in the hydrogen common rail meet the injection requirements; If the flow rate and pressure of hydrogen in the hydrogen common rail do not meet the injection requirements, the injection pressure of hydrogen is adjusted until the flow rate and pressure of hydrogen meet the injection requirements. The step of determining the injection requirements based on the corrected injection parameters and ignition timing includes: The current cylinder pressure in the hydrogen engine cylinder is determined based on the injection timing and ignition timing in the corrected injection parameters. The current injection quantity of hydrogen is determined based on the injection pulse width in the corrected injection parameters. The current cylinder pressure and the current injection quantity of hydrogen are determined as the injection requirements.

2. The method according to claim 1, characterized in that, The step of correcting the injection parameters and ignition timing based on the cylinder pressure and the oxygen content to obtain the corrected injection parameters and ignition timing includes: The in-cylinder air-fuel ratio of the hydrogen engine is determined based on the oxygen content. The combustion conditions inside the hydrogen engine cylinder are determined based on the cylinder pressure. Based on the combustion conditions and the in-cylinder air-fuel ratio, the injection timing, ignition timing, and injection pulse width are corrected to obtain the corrected injection timing, ignition timing, and injection pulse width.

3. The method according to claim 2, characterized in that, The step of correcting the injection timing, ignition timing, and injection pulse width based on the combustion conditions and the in-cylinder air-fuel ratio to obtain corrected injection timing, ignition timing, and injection pulse width includes: When the cylinder pressure is detected to exceed the preset cylinder pressure, it is determined that the combustion condition is knocking in the hydrogen engine; The injection timing and ignition timing are adjusted to obtain the corrected injection timing and ignition timing; After the injection timing and the ignition timing are adjusted, it is determined whether the in-cylinder air-fuel ratio is consistent with the preset air-fuel ratio. If the in-cylinder air-fuel ratio is inconsistent with the preset air-fuel ratio, the injection pulse width is corrected to obtain the corrected injection pulse width.

4. The method according to claim 1, characterized in that, The determination of whether the flow rate and pressure of hydrogen in the hydrogen common rail meet the injection requirements includes: Divide the current injection quantity by the injection pulse width in the corrected injection parameters to obtain the current hydrogen flow rate; Determine whether the flow rate of hydrogen in the hydrogen common rail is consistent with the current flow rate; If the flow rate of hydrogen in the common hydrogen rail is the same as the current flow rate, then determine whether the pressure of hydrogen in the common hydrogen rail is the same as the current cylinder pressure. If the pressure of hydrogen in the common rail is inconsistent with the current cylinder pressure, then it is determined that the flow rate and pressure of hydrogen do not meet the injection requirements. If the flow rate of hydrogen in the hydrogen common rail is inconsistent with the current flow rate, then it is determined that the flow rate and pressure of hydrogen in the hydrogen common rail do not meet the injection requirements.

5. A device for controlling hydrogen flow rate and pressure, characterized in that, include: Hydrogen injector, used to obtain hydrogen injection parameters; The injection parameters include injection timing and injection pulse width, and are used to inject the hydrogen into the hydrogen engine according to the injection parameters so that the hydrogen and air are mixed and burned in the hydrogen engine cylinder; A cylinder pressure sensor is used to monitor the cylinder pressure inside the hydrogen engine cylinder in real time. An oxygen sensor is used to monitor the oxygen content in the gas emitted by the hydrogen engine in real time. The electronic control unit is used to correct the injection parameters and ignition timing based on the cylinder pressure and the oxygen content to obtain the corrected injection parameters and ignition timing; the ignition timing is the time when hydrogen and air ignite and burn in the cylinder of the hydrogen engine, and is used to determine the injection requirements based on the corrected injection parameters and ignition timing. A hydrogen temperature and pressure sensor is used to determine whether the flow rate and pressure of hydrogen in the hydrogen common rail meet the injection requirements. A low-pressure electrically controlled pressure regulating valve is used to adjust the injection pressure of hydrogen if the flow rate and pressure of hydrogen in the hydrogen common rail do not meet the injection requirements, until the flow rate and pressure of hydrogen meet the injection requirements after adjustment. Specifically, the electronic control unit is used for: The current cylinder pressure in the hydrogen engine cylinder is determined based on the injection timing and ignition timing in the corrected injection parameters. The current injection quantity of hydrogen is determined based on the injection pulse width in the corrected injection parameters. The current cylinder pressure and the current injection quantity of hydrogen are determined as the injection requirements.

6. The apparatus according to claim 5, characterized in that, The electronic control unit is specifically used for: The in-cylinder air-fuel ratio of the hydrogen engine is determined based on the oxygen content. The combustion conditions inside the hydrogen engine cylinder are determined based on the cylinder pressure. Based on the combustion conditions and the in-cylinder air-fuel ratio, the injection timing, ignition timing, and injection pulse width are corrected to obtain the corrected injection timing, ignition timing, and injection pulse width.

7. The apparatus according to claim 6, characterized in that, The electronic control unit is specifically used for: When the cylinder pressure is detected to exceed the preset cylinder pressure, it is determined that the combustion condition is knocking in the hydrogen engine; The injection timing and ignition timing are adjusted to obtain the corrected injection timing and ignition timing; After the injection timing and the ignition timing are adjusted, it is determined whether the in-cylinder air-fuel ratio is consistent with the preset air-fuel ratio. If the in-cylinder air-fuel ratio is inconsistent with the preset air-fuel ratio, the injection pulse width is corrected to obtain the corrected injection pulse width.

8. The apparatus according to claim 6, characterized in that, The hydrogen temperature and pressure sensor is specifically used for: Divide the current injection quantity by the injection pulse width in the corrected injection parameters to obtain the current hydrogen flow rate; Determine whether the flow rate of hydrogen in the hydrogen common rail is consistent with the current flow rate; If the flow rate of hydrogen in the common hydrogen rail is the same as the current flow rate, then determine whether the pressure of hydrogen in the common hydrogen rail is the same as the current cylinder pressure. If the pressure of hydrogen in the common rail is inconsistent with the current cylinder pressure, then it is determined that the flow rate and pressure of hydrogen do not meet the injection requirements. If the flow rate of hydrogen in the hydrogen common rail is inconsistent with the current flow rate, then it is determined that the flow rate and pressure of hydrogen in the hydrogen common rail do not meet the injection requirements.

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