Control method and device of premixed gas engine and computer readable storage medium

Abstract

The invention discloses a control method and device of a premixed gas engine and a computer readable storage medium. The method comprises the steps that after it is determined that an engine is powered on, the current rotating speed of the engine is monitored according to a preset time period; under the condition that the current rotating speed reaches the preset rotating speed and it is determined that the current running state of the engine meets the enabling condition, a fuel gas pre-supply valve is controlled to be opened after the first timing duration of a first timestamp so that fuel gas can be supplied before main fuel gas enters an air cylinder of the engine, the main fuel gas is fuel gas supplied through a preset supply path, and the main fuel gas is fuel gas supplied through a second timing duration of a second timestamp; the first timestamp is the timestamp when the current rotating speed reaches the preset rotating speed. According to the method and the device, the technical problem that the normal power supply requirement of a power supply system cannot be normally met due to long starting time of a gas engine adopting a premixed combustion mode in the prior art is solved.

Description

Technical Field

[0001] This application relates to the field of internal combustion engine technology, and more specifically, to a control method and apparatus for a premixed gas engine, and a computer-readable storage medium. Background Technology

[0002] Large-bore natural gas engines are commonly used as backup power sources for big data centers or for grid power generation. To ensure the normal operation of the power supply system, rapid engine start-up is required. However, for large-bore engines with pre-mixed gas and air before the turbocharger, the gas supply pipeline and fresh air intake pipeline are relatively long (generally greater than 5 meters). During engine start-up, the time it takes for the gas to mix with fresh air after entering the gas pipeline from the gas supply system and then reach the cylinder through the intake pipeline is relatively long, resulting in a long engine start-up time (around 15 seconds), which cannot adequately meet the power supply system's needs.

[0003] Regarding the issue that gas engines using premixed combustion mode in the aforementioned technologies take a long time to start up, making it difficult to meet the normal power supply requirements of the power supply system, no effective solution has yet been proposed. Summary of the Invention

[0004] This application provides a control method and apparatus for a premixed gas engine, as well as a computer-readable storage medium, to at least solve the technical problem in the related art that gas engines using premixed combustion mode have a long start-up time, making it difficult to meet the normal power supply requirements of the power supply system.

[0005] According to one aspect of the embodiments of this application, a control method for a premixed gas engine is provided. The premixed gas engine includes a gas pre-supply valve located at the intake manifold between the intercooler and the throttle valve of the premixed gas engine. The method includes: after determining that the engine is powered on, monitoring the current speed of the engine according to a predetermined time period, wherein the engine is a gas engine employing a premixed combustion mode; when the current speed reaches a predetermined speed and it is determined that the current operating state of the engine meets the enabling conditions, controlling the gas pre-supply valve to open after a first time interval of a first timestamp, so as to supply gas before the main gas enters the cylinder of the engine, wherein the main gas is gas supplied through a preset supply path, and the first timestamp is the timestamp at which the current speed reaches the predetermined speed.

[0006] Optionally, determining that the current operating state of the engine meets the enabling conditions includes: when the current speed reaches the predetermined speed, acquiring the fuel supply status and speed change rate of the engine; acquiring the current power-on duration of the engine; and determining that the current operating state meets the enabling conditions when the power-on duration is less than a preset power-on duration threshold, the fuel supply status is in the fuel supply state, and the speed change rate is not less than zero.

[0007] Optionally, the control method for the premixed gas engine further includes: obtaining the current first coolant temperature of the engine; and determining the first timing duration corresponding to the first coolant temperature according to the temperature-duration mapping relationship, wherein the temperature-duration mapping relationship is used to record the first mapping relationship between the coolant temperature and the timing duration, and the coolant temperature and the timing duration are inversely proportional.

[0008] Optionally, after the pre-supply valve is opened after a first time interval following the first time stamp to supply gas before the main gas enters the cylinder of the engine, the control method for the premixed gas engine further includes: when the current speed reaches the start-up speed, obtaining the current second coolant temperature of the engine and determining the current timestamp as the second timestamp; determining the second time interval corresponding to the second coolant temperature according to the temperature-duration mapping relationship; and when the engine has been running for a duration after the second timestamp for a period of time equal to the second time interval, determining that the engine has entered a stable operating state and controlling the pre-supply valve to close.

[0009] Optionally, after the pre-mixed gas engine controls the gas pre-supply valve to open after a first time interval following a first time stamp to supply gas before the main gas enters the cylinders of the engine, the control method further includes: obtaining the speed deviation between the current speed and the successful start speed, wherein the successful start speed is the initial marker speed at which the engine successfully starts; and if the speed deviation is determined to be greater than a preset speed deviation threshold, determining that the engine has entered a stable operating state and controlling the gas pre-supply valve to close.

[0010] Optionally, before determining that the speed deviation is greater than a preset speed deviation threshold, the control method of the premixed gas engine further includes: obtaining the pipe length of the intake pipe in the engine and the current third coolant temperature of the engine; determining the speed deviation threshold of the preset mapping relationship with the pipe length and the third coolant temperature as the preset speed deviation threshold, wherein the preset mapping relationship is used to record a second mapping relationship between the pipe length, the coolant temperature and the speed deviation threshold.

[0011] Optionally, the control method for the premixed gas engine further includes: simultaneously controlling the gas pre-supply valve to open after the first timing period of the first timestamp, acquiring the opening timestamp of the gas pre-supply valve; determining the timestamp that is later than the opening timestamp and has a time deviation of a predetermined duration from the opening timestamp as the detection timestamp; and determining that the engine has failed to start if the engine speed at the detection timestamp has not reached the low idle speed, and controlling the gas pre-supply valve to close, wherein the low idle speed is the minimum speed at which the engine maintains stable operation without external load.

[0012] Optionally, after monitoring the current speed of the engine according to a predetermined time period, the control method of the premixed gas engine further includes: when the current speed reaches the predetermined speed and the current operating state of the engine does not meet the enabling conditions, controlling the gas pre-supply valve to remain closed or controlling the gas pre-supply valve to close.

[0013] According to another aspect of the embodiments of this application, a control device for a premixed gas engine is also provided. The premixed gas engine includes a gas pre-supply valve located at the intake manifold between the intercooler and the throttle valve of the premixed gas engine. The device includes: a monitoring unit, configured to monitor the current speed of the engine according to a predetermined time period after the engine is powered on, wherein the engine is a gas engine employing a premixed combustion mode; and a first control unit, configured to control the gas pre-supply valve to open after a first time interval following a first timestamp when the current speed reaches a predetermined speed and the current operating state of the engine meets the enabling conditions, so as to supply gas before the main gas enters the cylinders of the engine, wherein the main gas is gas supplied through a preset supply path, and the first timestamp is the timestamp when the current speed reaches the predetermined speed.

[0014] Optionally, the control unit includes: a first acquisition module, configured to acquire the fuel supply status and speed change rate of the engine when the current speed reaches the predetermined speed; a second acquisition module, configured to acquire the current power-on duration of the engine; and a determination module, configured to determine that the current operating state meets the enabling conditions when the power-on duration is less than a preset power-on duration threshold, the fuel supply status is in the fuel supply state, and the speed change rate is not less than zero.

[0015] Optionally, the control device for the premixed gas engine further includes: a first acquisition unit, configured to acquire the current first coolant temperature of the engine after the control gas pre-supply valve opens after a first time interval of a first timestamp, so as to supply gas before the main gas reaches the cylinder of the engine; and a first determination unit, configured to determine the first time interval corresponding to the first coolant temperature according to the temperature-duration mapping relationship, wherein the temperature-duration mapping relationship is used to record the first mapping relationship between the coolant temperature and the time interval, and the coolant temperature is inversely proportional to the time interval.

[0016] Optionally, the control device for the premixed gas engine includes: a second acquisition unit, configured to acquire the current second coolant temperature of the engine and determine the current timestamp as the second timestamp after the control gas pre-supply valve opens after a first time interval following a first timestamp to supply gas before the main gas enters the cylinder of the engine, provided that the current engine speed reaches the start-up success speed; a second determination unit, configured to determine the second time interval corresponding to the second coolant temperature based on the temperature-duration mapping relationship; and a third determination unit, configured to determine that the engine has entered a stable operating state and control the gas pre-supply valve to close when the engine has been running for the second time interval following the second timestamp for the duration of the second time interval.

[0017] Optionally, the control device for the premixed gas engine further includes: a third acquisition unit, configured to acquire the speed deviation between the current speed and the successful start speed after the control gas pre-supply valve opens after a first time interval of the first timestamp to supply gas before the main gas enters the cylinder of the engine, wherein the successful start speed is the initial marker speed at which the engine successfully starts; and a fourth determination unit, configured to determine that the engine has entered a stable operating state and control the gas pre-supply valve to close when the speed deviation is determined to be greater than a preset speed deviation threshold.

[0018] Optionally, the control device for the premixed gas engine further includes: a fourth acquisition unit, used to acquire the pipe length of the intake pipe in the engine and the current third coolant temperature of the engine before determining that the speed deviation is greater than a preset speed deviation threshold; and a fifth determination unit, used to determine the speed deviation threshold of the preset mapping relationship with the pipe length and the third coolant temperature as the preset speed deviation threshold, wherein the preset mapping relationship is used to record a second mapping relationship between the pipe length, the coolant temperature and the speed deviation threshold.

[0019] Optionally, the control device for the premixed gas engine further includes: a fifth acquisition unit, configured to acquire the opening timestamp of the gas pre-supply valve while controlling the gas pre-supply valve to open after the first timing period of the first timestamp; a sixth determination unit, configured to determine the timestamp that is later than the opening timestamp and has a time deviation of a predetermined duration from the opening timestamp as the detection timestamp; and a second control unit, configured to determine that the engine has failed to start and control the gas pre-supply valve to close when the engine speed at the detection timestamp has not reached the low idle speed, wherein the low idle speed is the minimum speed at which the engine maintains stable operation without external load.

[0020] Optionally, the control device of the premixed gas engine further includes: a third control unit, configured to, after monitoring the current speed of the engine according to a predetermined time period, control the gas pre-supply valve to remain closed or control the gas pre-supply valve to close when the current speed reaches the predetermined speed and the current operating state of the engine does not meet the enabling conditions.

[0021] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes any of the above-described control methods for a premixed gas engine.

[0022] According to another aspect of the embodiments of this application, a computer program product is also provided, including computer instructions, which, when executed by a processor, perform any of the control methods for the premixed gas engine described above.

[0023] In this embodiment, after the engine is powered on, the current engine speed is monitored at a predetermined time interval. The engine is a gas engine using premixed combustion mode. Then, when the current speed reaches the predetermined speed and the current operating state of the engine meets the enabling conditions, the gas pre-supply valve is controlled to open after the first timing period of the first timestamp. This supplies gas before the main gas enters the cylinders of the engine. The main gas is supplied through a preset supply path, and the first timestamp is the time when the current speed reaches the predetermined speed. This technical solution achieves the goal of adding a gas pre-supply valve at the intake manifold between the engine intercooler and the throttle valve, and pre-supplying gas before the main gas enters the cylinders during engine start-up. This shortens the distance from the gas injection point to the cylinder, accelerates the start-up speed, and reduces the engine start-up time. It also ensures the normal power supply of the power supply system and solves the technical problem in related technologies where the start-up time of gas engines using premixed combustion mode is too long, making it difficult to meet the normal power supply requirements of the power supply system. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0025] Figure 1 This is a hardware structure block diagram of a mobile terminal for a control method of a premixed gas engine according to an embodiment of this application.

[0026] Figure 2 This is a schematic diagram of a premixed gas engine according to an embodiment of this application;

[0027] Figure 3 This is a flowchart of a control method for a premixed gas engine according to an embodiment of this application;

[0028] Figure 4 This is a flowchart of an optional control method for a premixed gas engine according to an embodiment of this application;

[0029] Figure 5 This is a flowchart illustrating the control of the gas pre-supply valve closing according to an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of a control device for a premixed gas engine according to an embodiment of this application.

[0031] The above figures include the following reference numerals:

[0032] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device; 1. Air filter; 2. Gas valve; 3. Mixer; 4. Turbocharger; 5. Intercooler; 6. Intake bypass valve; 7. Intake manifold; 8. Gas pre-supply valve; 9. Throttle valve; 10. Intake manifold; 11. Engine cylinder; 12. Exhaust manifold; 13. Exhaust turbine; 14. Exhaust main pipe. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] As described in the background section, gas engines employing premixed combustion mode in related technologies have a long start-up time, making it difficult to meet the normal power supply requirements of the power supply system. To address these shortcomings, embodiments of this application provide a control method and apparatus for a premixed gas engine, as well as a computer-readable storage medium.

[0036] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0037] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a control method of a premixed gas engine according to an embodiment of this application. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0038] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the control method of the premixed gas engine in this embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0039] According to an embodiment of this application, a method embodiment for controlling a premixed gas engine is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0040] Figure 2 This is a schematic diagram of a premixed gas engine according to an embodiment of this application, as shown below. Figure 2As shown, in the existing technical solutions, gas engines using premixed combustion typically require the gas to be fully mixed with air in the mixer 3 before entering the combustion chamber to form a uniform premixed gas before ignition and combustion. Although this provides a more efficient combustion process and lower harmful emissions compared to diffusion combustion, the time it takes for the gas to travel from the gas supply system into the gas pipeline, mix with fresh air, and then reach the cylinder through the intake pipeline is relatively long, resulting in a long engine start-up time that is difficult to meet the normal power supply requirements of the power supply system. To solve this problem, this application embodiment adds a gas pre-supply valve 8 at the intake manifold 7 between the engine intercooler 5 and the throttle valve 9. By opening the gas pre-supply valve 8 during engine start-up, the distance from the gas injection point to the cylinder is shortened, thereby accelerating the start-up speed.

[0041] Through application Figure 2 In the premixed gas engine, during engine startup, air is first purified by air filter 1, and then uniformly mixed with natural gas released by gas valve 2 in mixer 3 to form a combustible mixture. The mixture is then pressurized by turbocharger 4 and cooled by intercooler 5 to increase density. Gas pre-supply valve 8 opens in advance during the startup phase, shortening the time for gas to reach engine cylinders 11 and accelerating the startup process. Throttle valve 9 adjusts the mixture flow according to ECU commands, while intake manifold 7 and intake manifold 10 ensure that the mixture is evenly distributed to each cylinder 11. The exhaust gas produced by combustion is collected through exhaust manifold 12, and the exhaust turbine 13 uses the exhaust gas energy to increase pressure, and finally discharged through exhaust manifold 14, optimizing engine startup speed and performance stability. Intake bypass valve 6 can also be used to allow some of the pressurized gas to bypass the throttle valve or flow directly to the atmosphere during engine low load or startup, thereby avoiding excessive pressurization of the turbocharger and protecting the turbocharging system from damage.

[0042] The aforementioned premixed gas engine may include, but is not limited to, engines such as turbocharged premixed large-bore natural gas engines, dual-fuel engines, and premixed natural gas engines. In this embodiment, the turbocharged premixed large-bore natural gas engine will be used as an example for further explanation.

[0043] The control method of the premixed gas engine in this application embodiment is applied to Figure 2 Premixed gas engines in China Figure 3 This is a flowchart of a control method for a premixed gas engine according to an embodiment of this application, such as... Figure 3 As shown, the method includes the following steps:

[0044] Step S302: After confirming that the engine is powered on, monitor the current speed of the engine according to a predetermined time cycle, wherein the engine is a gas engine using a premixed combustion mode.

[0045] The following is combined Figure 4 The embodiments described above in this application will be further described in detail. Figure 4 This is a flowchart of an optional control method for a premixed gas engine according to an embodiment of this application; as shown below. Figure 4 As shown, after the engine T15 switch is powered on, in order to ensure that the engine ignites and performs work immediately during synchronization, the engine speed can be monitored in real time so as to open the gas pre-supply valve 8 to supply gas at the appropriate time.

[0046] Step S304: When the current speed reaches the predetermined speed and the current operating state of the engine meets the enabling conditions, the pre-supply valve 8 is controlled to open after the first timing period of the first timestamp, so as to supply gas before the main gas enters the cylinder of the engine. The pre-supply valve 8 is located at the intake manifold 7 between the intercooler 5 and the throttle valve 9 of the engine. The main gas is gas supplied through a preset supply path. The first timestamp is the timestamp when the current speed reaches the predetermined speed.

[0047] Optionally, the above-mentioned preset supply path is the path through which the air supply system mixes with air and enters the engine cylinder 11.

[0048] In this embodiment, to ensure that the engine ignites and performs work immediately upon synchronization, the gas supply needs to begin before the engine reaches the synchronization speed. Therefore, it can be set that when the engine electronic control unit (ECU) detects that the engine speed is greater than a predetermined speed (which is less than the engine's synchronization speed, for example, the predetermined speed can be set to 50 rpm, or it can be set according to the actual situation, without specific limitations here), the gas pre-supply valve 8 is opened after a set time t1, i.e., the first timing duration, so as to supply gas before the main gas enters the engine cylinder, shorten the distance from the gas injection point to the cylinder, and speed up the start-up speed. In addition, the acquisition of the above-mentioned timestamp can be achieved, including but not limited to, by setting a timer.

[0049] The conditions for enabling the control of the gas pre-supply valve 8, as described above, will be explained in detail in the following embodiments. They will not be repeated here.

[0050] As can be seen from the above, by applying the technical solution provided in the above embodiments of this application, after determining that the engine is powered on, the current speed of the engine can be monitored according to a predetermined time cycle. The engine is a gas engine using a premixed combustion mode. Then, when the current speed reaches the predetermined speed and it is determined that the current operating state of the engine meets the enabling conditions, the gas pre-supply valve 8 is controlled to open after the first timing period of the first timestamp, so as to supply gas before the main gas enters the cylinder of the engine. The main gas is gas supplied through a preset supply path. The first timestamp is the timestamp when the current speed reaches the predetermined speed. This achieves the technical effect of shortening the distance from the gas injection point to the cylinder, accelerating the start-up speed, and shortening the engine start-up time by adding a gas pre-supply valve 8 at the intake manifold 7 between the engine intercooler 5 and the throttle valve 9, and opening the gas pre-supply valve 8 during the engine start-up process to pre-supply gas before the main gas enters the cylinder. This also ensures the normal power supply of the power supply system.

[0051] Therefore, the technical solution provided by the above embodiments of this application solves the technical problem in the related art that the gas engine using the premixed combustion mode takes a long time to start up, making it difficult to meet the normal power supply requirements of the power supply system.

[0052] Applied to Figure 2 In a specific embodiment of this application, determining that the current operating state of the premixed gas engine meets the enabling conditions includes: when the current speed reaches a predetermined speed, obtaining the fuel supply status and speed change rate of the engine; obtaining the current power-on duration of the engine; and determining that the current operating state meets the enabling conditions when the power-on duration is less than a preset power-on duration threshold, the fuel supply status is in the fuel supply state, and the speed change rate is not less than zero.

[0053] In this embodiment, when the engine stops suddenly due to a malfunction during operation, its speed may also meet the speed condition for opening the gas pre-supply valve 8, that is, the speed reaches the predetermined speed. In this case, opening the gas pre-supply valve 8 may pose a certain risk. Therefore, an enabling condition can be added to determine whether the gas pre-supply valve 8 needs to be opened in conjunction with the speed condition.

[0054] Specifically, the engine start-up process generally occurs immediately after power is applied, and its speed usually increases. However, when the engine stops suddenly due to a malfunction, it may suspend fuel supply to avoid risks, and its speed usually decreases. Therefore, these aspects can be used to determine which situation is currently in which condition. For example, the enabling conditions can be that the engine power-on time is less than a preset power-on time threshold, the fuel supply status is in the fuel supply state, and the speed change rate is not negative (i.e., not less than zero). If the current state of the engine meets these conditions, it can be considered that the engine is in the start-up process, and the gas pre-supply valve 8 can be opened when the speed reaches the predetermined speed. If the current state of the engine does not meet these conditions, it can be considered that the engine is in the emergency stop process caused by a malfunction, and it is not necessary to open the gas pre-supply valve 8 when the speed reaches the predetermined speed.

[0055] Applied to Figure 2 In an optional embodiment of the premixed gas engine in this application, the control method of the premixed gas engine further includes: obtaining the current first coolant temperature of the engine; and determining the first timing duration corresponding to the first coolant temperature according to the temperature-duration mapping relationship, wherein the temperature-duration mapping relationship is used to record the first mapping relationship between the coolant temperature and the timing duration, and the coolant temperature and the timing duration are inversely proportional.

[0056] Optionally, the above-mentioned coolant temperature refers to the temperature at which the coolant in the engine is typically water or a water-based mixture.

[0057] Specifically, since the ECU recognizes different speeds for synchronization in different starting states such as cold or hot engines, in order to ensure that the engine can ignite and perform power immediately upon synchronization and avoid idling after synchronization, the first timing duration can be set according to the mapping relationship between the current engine coolant temperature (referring to the first coolant temperature and engine coolant temperature, i.e., the coolant temperature-time mapping relationship). Generally speaking, the lower the engine coolant temperature, the longer the time to find synchronization, that is, the lower the coolant temperature, the longer the delay time. See the example given in Table 1 below.

[0058] Table 1

[0059]

[0060]

[0061] It should be noted that Table 1 is merely an example and does not represent a limitation. It can be adapted to the actual situation, and no specific restrictions are imposed here.

[0062] Once the engine speed reaches the starting speed, if the pre-supply of gas by the pre-supply valve 8 is immediately stopped, due to the long gas supply system pipeline and air intake pipeline, if the gas injected by the main gas supply system does not reach the cylinder at this time, it will cause engine misfire, resulting in a sudden drop in speed, i.e., a rapid decrease in speed within a short period of time. To avoid the risk of premature closure of the pre-supply valve 8, it is necessary to monitor the engine's operating status to determine whether the pre-supply can be stopped. This application provides two methods for determining whether the pre-supply can be stopped, which are described below in conjunction with... Figure 5 The embodiments described above in this application will be further described in detail. Figure 5 This is a flowchart illustrating the control of the gas pre-supply valve 8 to close according to an embodiment of this application.

[0063] Applied to Figure 2 In one specific embodiment of the premixed gas engine in this application, after the premixed gas supply valve 8 is opened after a first time interval following a first timestamp to supply gas before the main gas enters the cylinder of the engine, the control method of the premixed gas engine further includes: when the current speed reaches the speed at which a successful start is achieved, obtaining the current second coolant temperature of the engine and determining the current timestamp as the second timestamp; determining the second time interval corresponding to the second coolant temperature according to the temperature-duration mapping relationship; and when the engine has been running for a duration after the second timestamp for a period of time that reaches the second time interval, determining that the engine has entered a stable operating state and controlling the premixed gas supply valve 8 to close.

[0064] like Figure 5 As shown, when the engine speed reaches the successful start speed, it can be considered that the engine has overcome the obstacles of the start-up stage and entered a state that can at least maintain stable operation. However, the speed needs to be maintained at or above the successful start speed for a period of time to ensure that it has entered a stable operating state. Therefore, when the engine speed reaches the successful start speed, the corresponding timing duration can be determined according to the current temperature of the engine coolant (referring to the second coolant temperature) as shown in Table 1, so as to set the gas pre-supply valve 8 to be closed after the delay time t2, i.e. the second timing duration.

[0065] Applied to Figure 2 In another specific embodiment of the premixed gas engine in this application, after the premixed gas supply valve 8 is opened after a first time interval following a first time stamp to supply gas before the main gas enters the cylinder of the engine, the control method of the premixed gas engine further includes: obtaining the speed deviation between the current speed and the speed at which the engine is successfully started, wherein the speed at which the engine is successfully started is the initial mark speed at which the engine is successfully started; and determining that the engine has entered a stable operating state when the speed deviation is determined to be greater than a preset speed deviation threshold, and controlling the premixed gas supply valve 8 to close.

[0066] like Figure 5 As shown, the engine's current speed can be monitored to determine whether it is greater than the start-up speed + speed deviation threshold n. In other words, the gas pre-supply valve 8 can be closed by judging whether the speed deviation between the engine speed and the start-up speed is greater than the preset speed deviation threshold. This is because the start-up speed is generally set based on the minimum requirement that the engine can run stably and is ready to bear the load. However, simply reaching this speed is not enough to ensure that the engine starts successfully, because there may be instantaneous speed fluctuations. Therefore, a speed deviation threshold n can be introduced, requiring the engine speed not only to reach the start-up speed, but also to be further increased and stabilized at the start-up speed + n or higher. Once the engine is detected to be stable at this higher speed level, it can be determined that the engine has started successfully, and the gas pre-supply valve 8 can be closed.

[0067] Applied to Figure 2 In an optional embodiment of the premixed gas engine in this application, before determining that the speed deviation is greater than a preset speed deviation threshold, the control method of the premixed gas engine further includes: obtaining the pipe length of the intake pipe in the engine and the current third coolant temperature of the engine; determining the speed deviation threshold of the preset mapping relationship with the pipe length and the third coolant temperature as the preset speed deviation threshold, wherein the preset mapping relationship is used to record the second mapping relationship between the pipe length, the coolant temperature and the speed deviation threshold.

[0068] Specifically, the aforementioned speed deviation threshold n is not fixed and needs to be set or adjusted according to the specific conditions of the engine. Here, two key factors are considered: the length of the intake pipe and the current engine coolant temperature (referring to the third coolant temperature). The influence of the intake pipe length and the current engine coolant temperature on n is as follows: (1) When the intake pipe is longer, the time for the gas injected from the gas pre-supply valve 8 to reach the cylinder increases accordingly. This means that even if the main gas supply system has started to work normally, the pre-supply gas may not have fully reached the combustion chamber to participate in combustion. To avoid engine misfire or unstable speed, it is necessary to wait longer to ensure sufficient gas mixture in the cylinder. Therefore, the n value, i.e. the extra speed at which pre-supply gas is stopped, should be set higher. Conversely, if the intake pipe is short, the transmission time of gas from the pre-supply valve to the cylinder is reduced, and the corresponding n value can be set lower to stop pre-supply gas more quickly and avoid over-pre-supply. (2) When the engine water temperature is low, the mixing efficiency of gas and air is low. This will prolong the time required for the gas injected by the pre-supply valve 8 to fully mix with fresh air and reach a combustible state. Therefore, at low temperatures, the n value needs to be set higher to ensure that the engine has obtained a stable gas supply before the pre-supply valve 8 is closed, so that it can smoothly pass through the transition period from start-up to stable operation. However, when the engine water temperature is high, i.e., hot start, the mixing of gas and air is more uniform and the combustion efficiency is improved. Therefore, it is not necessary to wait too long to stop pre-supply gas. At this time, the n value can be reduced accordingly. Therefore, the longer the pipe and the lower the water temperature, the longer the pre-supply time is required, and the speed n should be larger. Refer to the example given in Table 2 below.

[0069] Table 2

[0070]

[0071]

[0072] It should be noted that Table 2 is merely an example and does not represent a limitation. It can be adapted to the actual situation, and no specific restrictions are imposed here.

[0073] Applied to Figure 2 In the premixed gas engine, the embodiments of this application also consider abnormal engine starting situations. On the one hand, if the engine fails to start successfully, the gas pre-supply valve 8 is closed; on the other hand, if the engine stops suddenly due to a malfunction and its speed reaches the predetermined speed for opening the gas pre-supply valve 8, the gas pre-supply valve 8 cannot be opened.

[0074] Applied to Figure 2In an optional embodiment of the premixed gas engine in this application, the control method of the premixed gas engine further includes: simultaneously opening the gas pre-supply valve 8 after a first timing period following the control of the gas pre-supply valve 8, acquiring the opening timestamp of the gas pre-supply valve 8; determining a timestamp later than the opening timestamp and with a time deviation of a predetermined duration from the opening timestamp as a detection timestamp; and determining that the engine has failed to start if the engine speed at the detection timestamp has not reached the low idle speed, and controlling the gas pre-supply valve 8 to close, wherein the low idle speed is the minimum speed at which the engine maintains stable operation without external load.

[0075] like Figure 5 As shown, the opening timestamp of the gas pre-supply valve 8 can be obtained, and then a detection timestamp can be set. The time deviation between the detection timestamp and the opening timestamp is a preset time. Then, it is determined whether the engine speed at the detection timestamp has reached the low idle speed. For example, a timer can be set to start timing from the gas pre-supply valve 8 pre-supplying gas. If the engine speed has not reached the low idle speed after 10 seconds, it is considered that the engine has failed to start due to poor combustion. At this time, the gas pre-supply valve 8 should be closed.

[0076] The start timestamp here can be the timestamp detected by the timer when the gas pre-supply valve 8 is opened, or it can be the timestamp obtained by adding the first timestamp when the engine speed reached the predetermined speed to the first timing duration.

[0077] Applied to Figure 2 In an optional embodiment of the premixed gas engine in this application, after monitoring the current speed of the engine according to a predetermined time period, the control method of the premixed gas engine further includes: controlling the gas pre-supply valve 8 to remain closed or controlling the gas pre-supply valve 8 to close when the current speed reaches the predetermined speed and the current operating state of the engine does not meet the enabling conditions.

[0078] like Figure 4 As shown, when the engine stops suddenly due to a malfunction, its speed may also meet the speed condition for the gas pre-supply valve 8 to open. Therefore, when the engine speed is detected to reach the predetermined speed, it can be judged whether the enabling condition is met based on the current state of the engine. If it is not met, it is considered that the gas pre-supply valve 8 cannot be opened at present, and it can be controlled to remain closed. Of course, if the sudden stop is caused by a malfunction during the opening of the gas pre-supply valve 8, the gas pre-supply valve 8 must be closed.

[0079] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0080] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium such as ROM / RAM, magnetic disk, or optical disk, and includes several instructions to enable a terminal device, such as a mobile phone, computer, server, or network device, to execute the methods described in the various embodiments of this application.

[0081] According to an embodiment of this application, a control device for a premixed gas engine used to implement the above-described control method for a premixed gas engine is also provided. The control device for the premixed gas engine in this embodiment is applied to... Figure 2 Premixed gas engines, see Figure 2 The premixed gas engine includes a gas pre-supply valve 8, which is located at the intake manifold 7 between the intercooler 5 and the throttle valve 9 of the premixed gas engine. Figure 6 This is a schematic diagram of the control device for a premixed gas engine according to an embodiment of this application, as shown below. Figure 6 As shown, the device includes a monitoring unit 61 and a first control unit 63. The control device for this premixed gas engine will now be described in detail.

[0082] The monitoring unit 61 is used to monitor the current speed of the engine according to a predetermined time period after the engine is powered on, wherein the engine is a gas engine using a premixed combustion mode.

[0083] The first control unit 63 is used to control the gas pre-supply valve 8 to open after a first timing period of the first timestamp when the current speed reaches the predetermined speed and the current operating state of the engine meets the enabling conditions, so as to supply gas before the main gas enters the cylinder of the engine. The main gas is gas supplied through a preset supply path, and the first timestamp is the timestamp when the current speed reaches the predetermined speed.

[0084] It should be noted that the monitoring unit 61 and the first control unit 63 mentioned above correspond to steps S302 to S304 in the above embodiments. The two units and the corresponding steps implement the same instances and application scenarios, but are not limited to the content disclosed in the above embodiments.

[0085] As can be seen from the above, in the scheme described in the above embodiments of this application, the monitoring unit can first monitor the current speed of the engine according to a predetermined time period after determining that the engine is powered on, wherein the engine is a gas engine using a premixed combustion mode; then, the first control unit controls the gas pre-supply valve 8 to open after the first time interval of the first time stamp when the current speed reaches the predetermined speed and the current operating state of the engine meets the enabling conditions, so as to supply gas before the main gas enters the cylinder of the engine, wherein the main gas is gas supplied through a preset supply path, and the first time stamp is the time stamp when the current speed reaches the predetermined speed. This achieves the technical effect of shortening the distance from the gas injection point to the cylinder, accelerating the start-up speed, and shortening the engine start-up time by adding a gas pre-supply valve 8 at the intake manifold 7 between the engine intercooler 5 and the throttle valve 9, and opening the gas pre-supply valve 8 during the engine start-up process to pre-supply gas before the main gas enters the cylinder, thereby ensuring the normal power supply of the power supply system.

[0086] Therefore, the technical solution provided by the above embodiments of this application solves the technical problem in the related art that the gas engine using the premixed combustion mode takes a long time to start up, making it difficult to meet the normal power supply requirements of the power supply system.

[0087] Applied to Figure 2 In an optional embodiment of the premixed gas engine in this application, the control unit includes: a first acquisition module, used to acquire the fuel supply status and speed change rate of the engine when the current speed reaches a predetermined speed; a second acquisition module, used to acquire the current power-on duration of the engine; and a determination module, used to determine that the current operating state meets the enabling conditions when the power-on duration is less than a preset power-on duration threshold, the fuel supply status is in the fuel supply state, and the speed change rate is not less than zero.

[0088] Applied to Figure 2In an optional embodiment of the premixed gas engine in this application, the control device of the premixed gas engine further includes: a first acquisition unit, used to acquire the current first coolant temperature of the engine after the control gas pre-supply valve 8 is opened after a first time interval of a first timestamp, so as to supply gas before the main gas reaches the cylinder of the engine; and a first determination unit, used to determine the first time interval corresponding to the first coolant temperature according to the temperature-duration mapping relationship, wherein the temperature-duration mapping relationship is used to record the first mapping relationship between the coolant temperature and the time interval, and the coolant temperature and the time interval are inversely proportional.

[0089] Applied to Figure 2 In an optional embodiment of the premixed gas engine in this application, the control device of the premixed gas engine includes: a second acquisition unit, used to acquire the current second coolant temperature of the engine and determine the current timestamp as the second timestamp after the control gas pre-supply valve 8 is opened after a first time interval of a first timestamp to supply gas before the main gas enters the cylinder of the engine, when the current speed reaches the start-up success speed; a second determination unit, used to determine the second time interval corresponding to the second coolant temperature according to the temperature-duration mapping relationship; and a third determination unit, used to determine that the engine has entered a stable operating state and control the gas pre-supply valve 8 to close when the engine has been running for the second time interval after the second timestamp.

[0090] Applied to Figure 2 In an optional embodiment of the premixed gas engine in this application, the control device of the premixed gas engine further includes: a third acquisition unit, used to acquire the speed deviation between the current speed and the start-up success speed after the control gas pre-supply valve 8 is opened after a first time interval of the first timestamp to supply gas before the main gas enters the cylinder of the engine, wherein the start-up success speed is the initial mark speed at which the engine starts successfully; and a fourth determination unit, used to determine that the engine has entered a stable operating state when the speed deviation is determined to be greater than a preset speed deviation threshold, and to control the gas pre-supply valve 8 to close.

[0091] Applied to Figure 2 In an optional embodiment of the premixed gas engine in this application, the control device of the premixed gas engine further includes: a fourth acquisition unit, used to acquire the pipe length of the intake pipe and the current third coolant temperature of the engine before determining that the speed deviation is greater than a preset speed deviation threshold; and a fifth determination unit, used to determine the speed deviation threshold of the pipe length and the third coolant temperature in the preset mapping relationship as the preset speed deviation threshold, wherein the preset mapping relationship is used to record the second mapping relationship between the pipe length, the coolant temperature and the speed deviation threshold.

[0092] Applied to Figure 2 In an optional embodiment of the premixed gas engine in this application, the control device of the premixed gas engine further includes: a fifth acquisition unit, used to acquire the opening timestamp of the gas pre-supply valve 8 while controlling the gas pre-supply valve 8 to open after a first timing period of the first timestamp; a sixth determination unit, used to determine the timestamp that is later than the opening timestamp and has a time deviation of a predetermined duration from the opening timestamp as the detection timestamp; and a second control unit, used to determine that the engine has failed to start and control the gas pre-supply valve 8 to close if the engine speed at the detection timestamp does not reach the low idle speed, wherein the low idle speed is the minimum speed at which the engine maintains stable operation without external load.

[0093] Applied to Figure 2 In an optional embodiment of the premixed gas engine in this application, the control device of the premixed gas engine further includes: a third control unit, which is used to control the gas pre-supply valve 8 to remain closed or control the gas pre-supply valve 8 to close after monitoring the current speed of the engine according to a predetermined time period, when the current speed reaches the predetermined speed and the current operating state of the engine does not meet the enabling conditions.

[0094] According to another aspect of the embodiments of this application, a control system for a premixed gas engine is also provided, wherein the control system for the premixed gas engine uses any of the premixed gas engine control methods described above.

[0095] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein the program executes the control method of any of the above-described premixed gas engines.

[0096] Optionally, in this embodiment, the computer-readable storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any communication device in a group of communication devices.

[0097] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: after determining that the engine is powered on, monitoring the current speed of the engine according to a predetermined time period, wherein the engine is a gas engine using a premixed combustion mode; when the current speed reaches a predetermined speed and it is determined that the current operating state of the engine meets the enabling conditions, controlling the gas pre-supply valve to open after a first time interval of a first timestamp, so as to supply gas before the main gas enters the cylinder of the engine, wherein the main gas is gas supplied through a preset supply path, and the first timestamp is the timestamp when the current speed reaches the predetermined speed.

[0098] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the current speed reaches a predetermined speed, obtaining the engine's fuel supply status and speed change rate; obtaining the engine's current power-on duration; and when the power-on duration is less than a preset power-on duration threshold, the fuel supply status is in the fuel supply state, and the speed change rate is not less than zero, determining that the current operating state meets the enabling conditions.

[0099] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: obtaining the current first coolant temperature of the engine; determining a first timing duration corresponding to the first coolant temperature according to the coolant temperature-time mapping relationship, wherein the coolant temperature-time mapping relationship is used to record the first mapping relationship between the coolant temperature and the timing duration, and the coolant temperature and the timing duration are inversely proportional.

[0100] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the current speed reaches the speed at which a successful start is achieved, the current second coolant temperature of the engine is obtained, and the current timestamp is determined as the second timestamp; a second timing duration corresponding to the second coolant temperature is determined according to the temperature-duration mapping relationship; when the engine runs for a duration after the second timestamp until the second timing duration is reached, the engine is determined to have entered a stable operating state, and the gas pre-supply valve is controlled to close.

[0101] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: obtaining the speed deviation between the current speed and the speed at which the engine is successfully started, wherein the speed at which the engine is successfully started is the initial flag speed at which the engine is successfully started; and, if the speed deviation is determined to be greater than a preset speed deviation threshold, determining that the engine has entered a stable operating state and controlling the gas pre-supply valve to close.

[0102] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: obtaining the pipe length of the intake pipe in the engine and the current third coolant temperature of the engine; determining a preset speed deviation threshold in the preset mapping relationship with the pipe length and the third coolant temperature as a preset speed deviation threshold, wherein the preset mapping relationship is used to record a second mapping relationship between the pipe length, the coolant temperature and the speed deviation threshold.

[0103] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: simultaneously opening the gas pre-supply valve after a first timing period following the control of the gas pre-supply valve, acquiring the opening timestamp of the gas pre-supply valve; determining a timestamp later than the opening timestamp and with a time deviation of a predetermined duration from the opening timestamp as a detection timestamp; and determining that the engine has failed to start if the engine speed at the detection timestamp has not reached the low idle speed, and controlling the gas pre-supply valve to close, wherein the low idle speed is the minimum speed at which the engine maintains stable operation without external load.

[0104] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for performing the following steps: when the current speed reaches a predetermined speed and the current operating state of the engine does not meet the enabling conditions, controlling the gas pre-supply valve to remain closed or controlling the gas pre-supply valve to close.

[0105] According to another aspect of the embodiments of this application, a processor is also provided, which is used to run a program, wherein the program executes the control method of any of the above-described premixed gas engines when it runs.

[0106] According to another aspect of the embodiments of this application, a computer program product is also provided, including computer instructions, which, when executed by a processor, perform a control method for a premixed gas engine as described above.

[0107] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0108] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0109] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0110] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0111] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0112] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0113] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0114] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A control method for a premixed gas engine, characterized in that, The premixed gas engine includes a gas pre-supply valve (8), which is located at the intake manifold (7) between the intercooler (5) and the throttle valve (9) of the premixed gas engine, and includes: After confirming that the engine is powered on, the current speed of the engine is monitored according to a predetermined time period, wherein the engine is a gas engine using a premixed combustion mode; When the current speed reaches the predetermined speed and the current operating state of the engine meets the enabling conditions, the gas pre-supply valve (8) is controlled to open after the first timing period of the first timestamp, so as to supply gas before the main gas enters the cylinder of the engine, wherein the main gas is gas supplied through a preset supply path, and the first timestamp is the timestamp when the current speed reaches the predetermined speed.

2. The control method for a premixed gas engine according to claim 1, characterized in that, Determining that the current operating state of the engine meets the enabling conditions includes: When the current speed reaches the predetermined speed, the fuel supply status and speed change rate of the engine are obtained; Obtain the current power-on duration of the engine; If the power-on duration is less than a preset power-on duration threshold, the fuel supply status is in the fuel supply state, and the speed change rate is not less than zero, then the current operating state is determined to meet the enabling conditions.

3. The control method for a premixed gas engine according to claim 1, characterized in that, The method further includes, before the control gas pre-supply valve (8) opens after a first timing period following a first timestamp to supply gas before the main gas reaches the cylinders of the engine: Obtain the current first coolant temperature of the engine; The first timing duration corresponding to the first coolant temperature is determined according to the liquid temperature-duration mapping relationship, wherein the liquid temperature-duration mapping relationship is used to record the first mapping relationship between the coolant temperature and the timing duration, and the coolant temperature and the timing duration are inversely proportional.

4. The control method for a premixed gas engine according to claim 1, characterized in that, After the pre-supply valve (8) is opened after a first timing period following a first timestamp to supply gas before the main gas enters the cylinders of the engine, the method further includes: If the current engine speed reaches the speed required for successful startup, the current second coolant temperature of the engine is obtained, and the current timestamp is determined as the second timestamp. The second timing duration corresponding to the second coolant temperature is determined based on the liquid temperature-duration mapping relationship; If the engine runs for a period of time after the second timestamp until the second timed duration is reached, the engine is determined to have entered a stable operating state, and the gas pre-supply valve (8) is controlled to close.

5. The control method for a premixed gas engine according to claim 1, characterized in that, After the pre-supply valve (8) is opened after a first timing period following a first timestamp to supply gas before the main gas enters the cylinders of the engine, the method further includes: The speed deviation between the current speed and the speed at which the engine was successfully started is obtained, wherein the speed at which the engine was successfully started is the initial mark speed at which the engine was successfully started; If the speed deviation is determined to be greater than the preset speed deviation threshold, the engine is determined to enter a stable operating state, and the gas pre-supply valve (8) is controlled to close.

6. The control method for a premixed gas engine according to claim 5, characterized in that, Before determining that the speed deviation is greater than a preset speed deviation threshold, the method further includes: Obtain the length of the intake manifold in the engine and the current temperature of the third coolant in the engine; The preset speed deviation threshold is determined as the speed deviation threshold in the preset mapping relationship with the pipe length and the third coolant temperature. The preset mapping relationship is used to record the second mapping relationship between the pipe length, the coolant temperature and the speed deviation threshold.

7. The control method for a premixed gas engine according to claim 1, characterized in that, The method further includes: While controlling the gas pre-supply valve (8) to open after the first timing duration of the first timestamp, the opening timestamp of the gas pre-supply valve (8) is obtained; The timestamp that is later than the start timestamp and has a time deviation of a predetermined duration from the start timestamp is determined as the detection timestamp; If the engine speed at the detection timestamp does not reach the low idle speed, it is determined that the engine has failed to start, and the gas pre-supply valve (8) is controlled to close, wherein the low idle speed is the minimum speed at which the engine can maintain stable operation without external load.

8. The control method for a premixed gas engine according to claim 1, characterized in that, After monitoring the current speed of the engine at predetermined time intervals, the method further includes: If the current speed reaches the predetermined speed and the current operating state of the engine does not meet the enabling conditions, the gas pre-supply valve (8) is controlled to remain closed or the gas pre-supply valve (8) is controlled to close.

9. A control device for a premixed gas engine, characterized in that, The premixed gas engine includes a gas pre-supply valve (8), which is located at the intake manifold (7) between the intercooler (5) and the throttle valve (9) of the premixed gas engine, and includes: A monitoring unit is used to monitor the current speed of the engine according to a predetermined time period after the engine is powered on, wherein the engine is a gas engine using a premixed combustion mode; The first control unit is configured to control the gas pre-supply valve (8) to open after a first time interval of a first timestamp when the current speed reaches a predetermined speed and the current operating state of the engine meets the enabling conditions, so as to supply gas before the main gas enters the cylinder of the engine, wherein the main gas is gas supplied through a preset supply path, and the first timestamp is the timestamp when the current speed reaches the predetermined speed.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein the program executes the control method for the premixed gas engine according to any one of claims 1 to 8.

Images