Dual methanol pump unit, main / standby switching method for dual methanol pumps, and dual methanol pump system

Abstract

This application provides a dual methanol pump device, a method for switching between main and standby methanol pumps, and a dual methanol pump system. It includes: a main methanol pump; a standby methanol pump; and a main control device connected to both the main and standby methanol pumps. The main control device is used to control the main methanol pump to stop working and to control the standby methanol pump to start working in the event of a malfunction in the main methanol pump. The main control device is also used to control the standby methanol pump to stop working and to control the main methanol pump to start working in the event of a malfunction in the standby methanol pump. This solution solves the problem in the prior art where a methanol pump failure leads to difficulty starting or stalling of the engine, resulting in downtime losses.

Description

Technical Field

[0001] This application relates to the field of methanol engine technology, and more specifically, to a dual methanol pump device, a method for switching between primary and backup dual methanol pumps, and a dual methanol pump system. Background Technology

[0002] Methanol engines, due to their low carbon emissions and renewable fuel, are gradually being adopted in heavy-duty commercial vehicles, ships, and stationary power applications. The core component of their fuel supply system is the methanol pump, responsible for pressurizing and delivering liquid methanol to the high-pressure common rail for precise injection. As the core component of the methanol engine's fuel supply, improper control of the methanol pump directly affects injection accuracy and atomization, thus impacting combustion control. A malfunction in the methanol pump can severely disrupt the normal operation of the engine.

[0003] Currently, methanol engines generally use a single methanol pump to achieve closed-loop control of methanol rail pressure. If the methanol pump fails, the methanol rail pressure cannot be established, and the engine will have difficulty starting or will shut down, resulting in downtime losses. Summary of the Invention

[0004] The main objective of this application is to provide a dual methanol pump device, a method for switching between main and backup dual methanol pumps, and a dual methanol pump system, so as to at least solve the problem in the prior art that once the methanol pump fails, the engine will be difficult to start or will shut down, resulting in downtime losses.

[0005] To achieve the above objectives, according to one aspect of this application, a dual methanol pump device is provided, comprising: a main methanol pump; a standby methanol pump; a methanol input terminal connected to both the main methanol pump and the standby methanol pump, the methanol input terminal being used to input methanol; a methanol output terminal connected to both the main methanol pump and the standby methanol pump, the methanol output terminal being used to output methanol; and a main control device connected to both the main methanol pump and the standby methanol pump, the main control device being used to control the main methanol pump to stop working and control the standby methanol pump to start working in the event of an abnormality in the main methanol pump, and further used to control the standby methanol pump to stop working and control the main methanol pump to start working in the event of an abnormality in the standby methanol pump.

[0006] Optionally, the dual methanol pump device further includes: a first relay having a first terminal and a second terminal, the first terminal of the first relay being connected to the main control device, and the second terminal of the first relay being connected to the main methanol pump, the first relay being used to control the power supply circuit of the main methanol pump to close or open; and a second relay having a first terminal and a second terminal, the first terminal of the second relay being connected to the main control device, and the second terminal of the second relay being connected to the standby methanol pump, the second relay being used to control the power supply circuit of the standby methanol pump to close or open.

[0007] Optionally, the dual methanol pump device further includes: a first check valve having a first end and a second end, the first end of the first check valve being connected to the main methanol pump, and the second end of the first check valve being connected to the methanol output end, the first check valve being used to control the flow direction of the methanol output from the main methanol pump; and a second check valve having a first end and a second end, the first end of the second check valve being connected to the standby methanol pump, and the second end of the second check valve being connected to the methanol output end, the second check valve being used to control the flow direction of the methanol output from the standby methanol pump.

[0008] According to another aspect of this application, a method for switching between primary and backup dual methanol pumps is provided. This method is applied to the main control device of any of the aforementioned dual methanol pump devices. The method includes: acquiring operating data of the primary methanol pump to obtain first operating data, wherein the operating data includes one or more of voltage, communication status, temperature, current, and rail pressure, where the rail pressure is the pressure of methanol in the pipeline; acquiring operating data of the backup methanol pump to obtain second operating data; when the primary methanol pump is operating, determining whether the primary methanol pump is malfunctioning based on the first operating data, and controlling the primary methanol pump to stop operating and controlling the backup methanol pump to start operating if the primary methanol pump is malfunctioning; when the backup methanol pump is operating, determining whether the backup methanol pump is malfunctioning based on the second operating data, and controlling the backup methanol pump to stop operating and controlling the primary methanol pump to start operating if the backup methanol pump is malfunctioning.

[0009] Optionally, determining whether the main methanol pump is abnormal based on the first operating data includes at least one of the following: determining the main methanol pump is abnormal if at least one of the following conditions is met: the voltage of the main methanol pump is greater than a preset maximum voltage value; the voltage of the main methanol pump is less than a preset minimum voltage value; the main methanol pump has a communication abnormality; the temperature of the main methanol pump is greater than a preset maximum temperature value; the temperature of the main methanol pump is less than a preset minimum temperature value; the current of the main methanol pump is greater than a preset maximum current value; or the current of the main methanol pump is less than a preset minimum current value. Alternatively, calculating the difference between the rail voltage of the main methanol pump at a first moment and the rail voltage of the main methanol pump at a second moment yields a rail voltage fluctuation value; determining the main methanol pump is abnormal if the rail voltage fluctuation value is greater than or equal to a preset fluctuation threshold; or determining the main methanol pump is abnormal if the rail voltage is less than a preset minimum rail voltage value throughout a preset operating period.

[0010] Optionally, after controlling the main methanol pump to stop working and controlling the standby methanol pump to start working in the event of a main methanol pump malfunction, the method further includes: calculating the working duration of the main methanol pump in one working cycle to obtain a first duration; calculating the working duration of the standby methanol pump after the main / standby switchover to obtain a second duration; calculating the difference between the first duration and the second duration to obtain a first duration difference; and controlling the standby methanol pump to stop working and controlling the main methanol pump to start working when the first duration difference is greater than or equal to a first preset duration threshold.

[0011] Optionally, after controlling the standby methanol pump to stop working and controlling the main methanol pump to start working when the first time difference is greater than or equal to the first preset time threshold, the method further includes one of the following: when the main methanol pump is restarted and the rail pressure fluctuation value of the main methanol pump is greater than or equal to the preset fluctuation threshold, determining that the main methanol pump is abnormal, controlling the main methanol pump to stop working, and controlling the standby methanol pump to start working; when the main methanol pump is restarted and the rail pressure of the main methanol pump is less than the preset minimum rail pressure value within the preset running time, determining that the main methanol pump is abnormal, controlling the main methanol pump to stop working, and controlling the standby methanol pump to start working.

[0012] Optionally, after acquiring the operating data of the standby methanol pump and obtaining the second operating data, the method further includes: calculating the duration of operation of the main methanol pump from the start of the first operating cycle to obtain a third duration; calculating the duration of operation of the standby methanol pump from the start of the second operating cycle to obtain a fourth duration; calculating the difference between the third duration and the fourth duration to obtain a second duration difference; calculating the total number of times the main methanol pump has started from the start of the first operating cycle to obtain the number of starts; and controlling the main methanol pump to stop operating and controlling the standby methanol pump to start operating when the second duration difference is greater than or equal to a second preset duration threshold and the number of starts is greater than or equal to a preset number of starts threshold.

[0013] Optionally, the dual methanol pump device further includes a first relay and a second relay. The first relay has a first terminal and a second terminal. The first terminal of the first relay is connected to the main control device, and the second terminal of the first relay is connected to the main methanol pump. The first relay is used to control the power supply circuit of the main methanol pump to close or open. The second relay has a first terminal and a second terminal. The first terminal of the second relay is connected to the main control device, and the second terminal of the second relay is connected to the standby methanol pump. The second relay is used to control the power supply circuit of the standby methanol pump to close or open. In the event of an abnormality in the main methanol pump, the main methanol pump is stopped from working, and the standby methanol pump is started to work, including: controlling the first relay to open; and controlling the second relay to close.

[0014] According to another aspect of this application, a dual methanol pump system is provided, the dual methanol pump system comprising: a dual methanol pump device, wherein the dual methanol pump device is any of the dual methanol pump devices described above; the dual methanol pump device includes a main control device, the main control device being used to execute any of the master / standby switching methods of the dual methanol pump described above.

[0015] By applying the technical solution of this application, two methanol pumps are designed. When the main methanol pump fails to establish or maintain the methanol rail pressure normally due to electrical faults, mechanical wear, or performance degradation, the main control equipment identifies the abnormal state, immediately cuts off the power supply to the pump, and starts the backup methanol pump, so that the fuel supply can be switched to the backup pump to continue working without interruption. Conversely, if the backup pump is abnormal while the main pump is normal, the main control equipment can also perform reverse switching to ensure that when either pump fails, the other pump can still independently complete the methanol pressurization and rail pressure establishment, so that the engine can maintain normal starting and running conditions, thereby avoiding downtime losses caused by the failure of a single pump. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 A schematic diagram of the dual methanol pump unit is shown.

[0018] Figure 2 A hardware structure block diagram of a mobile terminal for performing a dual methanol pump master / slave switching method according to an embodiment of this application is shown.

[0019] Figure 3 A schematic flowchart of a method for switching between primary and backup dual methanol pumps according to an embodiment of this application is shown.

[0020] Figure 4Another schematic diagram of the main / standby switching method for the dual methanol pumps in this scheme is shown;

[0021] Figure 5 A schematic diagram of rail pressure fluctuation is shown;

[0022] Figure 6 A schematic diagram of the main and standby pump switching is shown;

[0023] Figure 7 A structural block diagram of a dual methanol pump master / slave switching device according to an embodiment of this application is shown.

[0024] The above figures include the following reference numerals:

[0025] 102. Processor; 104. Memory; 106. Transmission equipment; 108. Input / output equipment; 10. Main methanol pump; 11. Backup methanol pump; 12. Main control equipment; 13. First relay; 14. Second relay; 15. First check valve; 16. Second check valve; 17. Pressure sensor; 18. Methanol injection valve. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] 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.

[0028] 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 for the embodiments of this application 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.

[0029] As described in the background section, in the prior art, if the methanol pump fails, the engine will be difficult to start or will shut down, resulting in downtime losses. To solve the above problems, the embodiments of this application provide a dual methanol pump device, a method for switching between the main and backup dual methanol pumps, and a dual methanol pump system.

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] This application provides a dual methanol pump device, such as Figure 1 As shown, it includes:

[0032] Main methanol pump 10;

[0033] Backup methanol pump 11;

[0034] The methanol input terminal is connected to the main methanol pump 10 and the standby methanol pump 11, respectively, and is used to input methanol.

[0035] The methanol output terminal is connected to the main methanol pump 10 and the standby methanol pump 11, respectively, and is used to output methanol.

[0036] The main control device 12 is connected to the main methanol pump 10 and the standby methanol pump 11 respectively. The main control device 12 is used to control the main methanol pump 10 to stop working and control the standby methanol pump 11 to start working in the event of an abnormality. The main control device 12 is also used to control the standby methanol pump 11 to stop working and control the main methanol pump 10 to start working in the event of an abnormality.

[0037] The device is designed with two methanol pumps. When the main methanol pump fails to establish or maintain the methanol rail pressure due to electrical faults, mechanical wear, or performance degradation, the main control equipment identifies the abnormal state, immediately cuts off the power supply to the pump, and starts the backup methanol pump, so that the fuel supply can be switched to the backup pump to continue working without interruption. Conversely, if the backup pump is abnormal while the main pump is normal, the main control equipment can also perform reverse switching to ensure that when either pump fails, the other pump can still independently complete the methanol pressurization and rail pressure establishment, so that the engine can maintain normal starting and running conditions, thereby avoiding downtime losses caused by the failure of a single pump.

[0038] Specifically, as the core component of methanol engine fuel supply, improper control of the methanol pump directly affects injection accuracy and atomization effect, thus impacting combustion control. A methanol pump malfunction can severely disrupt normal engine operation. This solution proposes a dual-methanol-pump main / standby hot backup control scheme for methanol engines. By identifying the pressure build-up status of a single methanol pump, fault detection and hot switching of methanol pumps are achieved, significantly improving control robustness and reducing customer downtime losses.

[0039] In the specific implementation process, the above-mentioned dual methanol pump device also includes a first relay 13 and a second relay 14. The first relay 13 has a first terminal and a second terminal. The first terminal of the first relay 13 is connected to the main control device 12, and the second terminal of the first relay 13 is connected to the main methanol pump 10. The first relay 13 is used to control the power supply circuit of the main methanol pump 10 to close or open. The second relay 14 has a first terminal and a second terminal. The first terminal of the second relay 14 is connected to the main control device 12, and the second terminal of the second relay 14 is connected to the standby methanol pump 11. The second relay 14 is used to control the power supply circuit of the standby methanol pump 11 to close or open.

[0040] In this scheme, the physical isolation and electronic control switching of the power supply circuits of the main and backup methanol pumps are achieved through independent relays. This effectively ensures that when any methanol pump fails or needs to be replaced, the other pump can immediately and reliably take over the fuel supply task, avoiding switching failures or malfunctions caused by the shared power supply control circuit.

[0041] In some embodiments, the dual methanol pump device further includes a first check valve 15 and a second check valve 16. The first check valve 15 has a first end and a second end. The first end of the first check valve 15 is connected to the main methanol pump 10, and the second end of the first check valve 15 is connected to the methanol output end. The first check valve 15 is used to control the flow direction of the methanol output from the main methanol pump 10. The second check valve 16 has a first end and a second end. The first end of the second check valve 16 is connected to the standby methanol pump 11, and the second end of the second check valve 16 is connected to the methanol output end. The second check valve 16 is used to control the flow direction of the methanol output from the standby methanol pump 11.

[0042] In this scheme, by setting independent one-way valves at the outlets of the two methanol pumps, the physical isolation of the output flow paths of the two pumps is achieved, which effectively prevents methanol backflow caused by pressure imbalance between the pumps during the hot switching process and ensures the stable establishment of methanol rail pressure.

[0043] In addition, the dual methanol pump unit also includes a pressure sensor 17 and a methanol injection valve 18. The pressure sensor is used to monitor the fuel pressure in the methanol rail in real time and feed the pressure signal back to the main control device 12 to achieve closed-loop control of the methanol rail pressure. The methanol injection valve is used to inject high-pressure methanol into the engine cylinder in an atomized form to complete the supply of fuel required for combustion.

[0044] 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 2This is a hardware structure block diagram of a mobile terminal for a dual methanol pump master / slave switching method according to an embodiment of the present invention. Figure 2 As shown, a mobile terminal may include one or more ( Figure 2 Only 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 2 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 2 The more or fewer components shown, or having the same Figure 2 The different configurations shown.

[0045] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the master / slave switching method of the dual methanol pumps in this embodiment of the invention. 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.

[0046] This embodiment provides a method for switching between primary and backup dual methanol pumps running on a mobile terminal, computer terminal, or similar computing device. 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. Furthermore, 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.

[0047] Figure 3 This is a flowchart illustrating the master / slave switching method for dual methanol pumps according to an embodiment of this application. Figure 3 As shown, the method includes the following steps:

[0048] Step S301: Obtain the operating data of the main methanol pump to obtain the first operating data. The operating data includes one or more of voltage, communication status, temperature, current and rail pressure. The rail pressure is the pressure of methanol in the pipeline.

[0049] Specifically, the first operating data of the main methanol pump is obtained: voltage, communication status, temperature, current and rail voltage. These parameters are then used to determine whether the main methanol pump is malfunctioning.

[0050] Step S302: Obtain the operating data of the aforementioned standby methanol pump to obtain the second operating data;

[0051] Specifically, the same parameter acquisition process is performed on the standby methanol pump to obtain its voltage, communication status, temperature, current and rail pressure data, forming the second working data.

[0052] Step S303: When the main methanol pump is working, determine whether the main methanol pump is abnormal based on the first working data. If the main methanol pump is abnormal, control the main methanol pump to stop working and control the standby methanol pump to start working.

[0053] Specifically, if the first operating data of the main methanol pump meets the fault conditions, it is determined that it can no longer reliably maintain the injection pressure, and the backup methanol pump is immediately switched to work, thereby completing the seamless transfer of power source without shutting down the engine and ensuring continuous operation.

[0054] Step S304: When the backup methanol pump is working, determine whether the backup methanol pump is abnormal based on the second working data. If the backup methanol pump is abnormal, control the backup methanol pump to stop working and control the main methanol pump to start working.

[0055] Specifically, when the standby methanol pump assumes the main working role, its status is continuously monitored based on its second working data. If the second working data of the standby methanol pump meets the fault conditions, it is determined that it can no longer reliably maintain the injection pressure, and it is immediately switched to the main methanol pump. This allows for a seamless transfer of power source without shutting down the engine, ensuring continuous operation.

[0056] In this embodiment, two methanol pumps are designed. When the main methanol pump fails to establish or maintain the methanol rail pressure due to electrical faults, mechanical wear, or performance degradation, the main control equipment identifies the abnormal state, immediately cuts off the power supply to the pump, and starts the backup methanol pump, so that the fuel supply can be switched to the backup pump to continue working without interruption. Conversely, if the backup pump is abnormal while the main pump is normal, the main control equipment can also perform reverse switching to ensure that when either pump fails, the other pump can still independently complete the methanol pressurization and rail pressure establishment, so that the engine can maintain normal starting and running conditions, thereby avoiding downtime losses caused by the failure of a single pump.

[0057] In the specific implementation process, the malfunction of the main methanol pump is determined based on the first working data, including at least one of the following: The main methanol pump is determined to be malfunctioning if at least one of the following conditions is met: the voltage of the main methanol pump is greater than a preset maximum voltage value; the voltage of the main methanol pump is less than a preset minimum voltage value; the communication of the main methanol pump is abnormal; the temperature of the main methanol pump is greater than a preset maximum temperature value; the temperature of the main methanol pump is less than a preset minimum temperature value; the current of the main methanol pump is greater than a preset maximum current value; or the current of the main methanol pump is less than a preset minimum current value. The difference between the rail voltage of the main methanol pump at a first moment and the rail voltage of the main methanol pump at a second moment is calculated to obtain the rail voltage fluctuation value. If the rail voltage fluctuation value of the main methanol pump is greater than or equal to a preset fluctuation threshold, the main methanol pump is determined to be malfunctioning. If the rail voltage is less than a preset minimum rail voltage value throughout a preset operating period of the main methanol pump, the main methanol pump is determined to be malfunctioning.

[0058] In this scheme, the three abnormality determination methods mentioned above cover three typical fault modes: sudden electrical faults, gradual performance degradation, and start-up failure. Through a multi-dimensional approach, it is possible to accurately determine whether the main methanol pump is abnormal.

[0059] Specifically, such as Figure 4 As shown, fault identification is divided into two categories. One category is the valve's own self-test faults, including low voltage, high voltage, communication failure, temperature sensor failure, excessive current, and overheating. Taking one of these as an example, if the methanol pump temperature exceeds the limit and persists for a period of time, reporting a methanol pump overheating fault, then this methanol pump should no longer operate and is marked as a performance degradation pump. A smooth thermal switchover of the backup methanol pump is achieved by controlling a delay relay. The performance degradation pump is only marked for the current driving cycle. After the engine is completely powered off, it is no longer marked, and it can be used normally in the next driving cycle.

[0060] Another type of fault is the characteristic fault detection of the methanol pump. The performance of the methanol pump is evaluated through actual performance. For example, the control stability of the rail pressure is identified within a sliding window. If the rail pressure fluctuates greatly and the deviation of the upper and lower amplitudes exceeds the limit, the counter is incremented by 1; otherwise, the counter is decremented by 1, with a minimum of 0. The timing window slides until the counter exceeds the limit within the last 5 minutes. If this happens, a fault of large rail pressure fluctuation and degradation of the methanol pump's rail pressure maintenance capability is reported. If the counter does not exceed the limit within 5 minutes, the counter is reset.

[0061] In addition, the pressure build-up rate before the methanol pump starts can be used to determine the problem. That is, a timer starts after the methanol pump begins operation. If the rail pressure fails to reach the required minimum pressure within a specified time, a fault is reported and marked as a slow pressure build-up fault for the methanol pump. Rail pressure fluctuations are as follows: Figure 5 As shown.

[0062] For example, the normal range of the main methanol pump's power supply voltage is set to 8–16V. When the voltage is detected to be continuously exceeding 16.5V or falling below 7.5V, it is determined to be a power supply abnormality, which may be due to a short circuit or power module failure. Communication abnormality refers to the loss of CAN messages between the main control device and the methanol pump controller for more than 3 cycles, indicating that the communication link is interrupted. The temperature threshold can be set to 120℃. If the sensor reading exceeds this value for 5 consecutive seconds, it indicates that the motor or bearings inside the pump are overheating and there is a risk of burnout. The current threshold can be set to 6.5A. If the current exceeds this value for 3 consecutive seconds, it indicates that the pump load has increased abnormally, possibly due to mechanical jamming. A current below 1.5A indicates that the pump is not operating normally or the rotor has stopped. Any of the above conditions will trigger the main methanol pump abnormality flag.

[0063] For example, the rail pressure value is continuously sampled within a 100ms sliding window, and the pressure change amplitude between adjacent sampling points is calculated. If more than 15 rail pressure fluctuations of ≥8 bar occur within any consecutive 5 minutes (i.e., the pressure drops instantaneously or the peak exceeds 8 MPa), it is determined that the pressure build-up capacity of the methanol pump has deteriorated.

[0064] For example, when the main methanol pump starts, if the rail pressure remains below 3.5 MPa (the minimum injection pressure required by the engine) within the preset 3-second pressure build-up time, the main control equipment will determine that it cannot build up effective rail pressure and mark it as a "slow pressure build-up" fault.

[0065] Specifically, the method for determining whether the standby methanol pump is abnormal is the same as that for determining whether the main methanol pump is abnormal. Both methods determine whether the standby methanol pump is abnormal by checking the voltage, communication status, temperature, current, rail voltage fluctuations, and rail voltage establishment speed. This will not be elaborated further here.

[0066] In some embodiments, after controlling the main methanol pump to stop working and controlling the standby methanol pump to start working in the event of a malfunction of the main methanol pump, the method further includes the following steps: calculating the working duration of the main methanol pump in one working cycle to obtain a first duration; calculating the working duration of the standby methanol pump after the main / standby switch to obtain a second duration; calculating the difference between the first duration and the second duration to obtain a first duration difference; and controlling the standby methanol pump to stop working and controlling the main methanol pump to start working when the first duration difference is greater than or equal to a first preset duration threshold.

[0067] In this scheme, by actively executing the load switching mechanism after fault recovery, the runtime balance control of the two methanol pumps is achieved, avoiding the shortened lifespan caused by long-term operation of a single pump.

[0068] Specifically, at the end of each driving cycle, the total operating time (in seconds) of the main methanol pump during that cycle is recorded in a non-volatile EEPROM memory as the first duration. When switching to the standby methanol pump due to a main pump failure, the operating time of the standby methanol pump is started to be independently timed, and this time is accumulated and written to the EEPROM each time the engine is powered off, forming the second duration.

[0069] For example, when the first duration difference is ≥300 hours (i.e., the cumulative working time of the main pump is more than 300 hours longer than that of the standby pump), it is determined that the service life of the two pumps is significantly unbalanced. In order to extend the overall system life and avoid excessive wear of a single pump, the main methanol pump will be forcibly started and the standby pump will be stopped when the engine is started again, even if the main methanol pump has been repaired (without fault indication), so as to achieve a rebalancing of the workload.

[0070] Specifically, if the standby pump is working and it is necessary to switch to the main pump, the working time of the two pumps can be counted. If the time difference is large, the standby pump can be stopped and the main pump can be controlled to work, just like in the above embodiment. The judgment conditions and control methods are the same as in the above embodiment, and will not be repeated here.

[0071] In the specific implementation process, when the first time difference is greater than or equal to the first preset time threshold, the standby methanol pump is controlled to stop working and the main methanol pump is controlled to start working. The method further includes one of the following: when the main methanol pump is restarted and the rail pressure fluctuation value of the main methanol pump is greater than or equal to the preset fluctuation threshold, the main methanol pump is determined to be abnormal, the main methanol pump is controlled to stop working, and the standby methanol pump is controlled to start working; when the main methanol pump is restarted and the rail pressure is less than the preset minimum rail pressure value within the preset running time of the main methanol pump, the main methanol pump is determined to be abnormal, the main methanol pump is controlled to stop working, and the standby methanol pump is controlled to start working.

[0072] In this scheme, if the rail pressure still cannot be established normally after restarting the methanol pump, it can be determined that the methanol pump is abnormal. Then, another normal methanol pump can be controlled to work, thereby further avoiding downtime losses caused by a single pump failure.

[0073] Specifically, due to the possibility of misdiagnosis with a faulty pump, if another normal methanol pump operates for more than 2000 hours, the faulty pump is switched on again to check if the large rail pressure fluctuation fault is repeatedly reported. If a large rail pressure fluctuation is detected, the pump is determined to be faulty and marked as a permanently faulty pump. Regardless of whether its operating time is balanced, this pump will no longer be used. After the faulty pump is repaired, the fault status marked in the ECU is reset using service tools to clear the fault.

[0074] Similarly, due to the possibility of misdiagnosis with a faulty pump, if another normal methanol pump operates for more than 2000 hours, switch to the faulty pump and try again to see if it can build up pressure normally. If the depressurization speed is still slow, the pump is considered to be faulty and marked as a permanently faulty pump. Regardless of whether its operating time is balanced, this pump will no longer be used. After the faulty pump is repaired, the fault status marked in the ECU is reset using service tools to clear the fault.

[0075] Specifically, if the standby methanol pump is working, it can be determined whether the standby methanol pump can build up pressure normally to determine whether to switch the main and standby pumps, which is the same as in the above embodiment, and will not be repeated here.

[0076] In some embodiments, after obtaining the operating data of the backup methanol pump and obtaining the second operating data, the method further includes the following steps: calculating the duration of operation of the main methanol pump from the start of the first operating cycle to obtain a third duration; calculating the duration of operation of the backup methanol pump from the start of the second operating cycle to obtain a fourth duration; calculating the difference between the third duration and the fourth duration to obtain a second duration difference; calculating the total number of times the main methanol pump has started from the start of the first operating cycle to obtain the number of starts; and controlling the main methanol pump to stop operating and controlling the backup methanol pump to start operating when the second duration difference is greater than or equal to a second preset duration threshold and the number of starts is greater than or equal to a preset number of starts threshold.

[0077] In this scheme, the operating time and the number of times the two pumps are started can be compared. If the operating time of a single pump is long and the number of starts is high, in order to extend the service life of the methanol pump, the other methanol pump can be switched to work, thereby further avoiding downtime losses caused by the failure of a single pump.

[0078] Specifically, during normal engine start-up, the fault status of both pumps is first identified. If both pumps are functioning correctly, both pumps have the ability to start and build pressure. When methanol is operating normally, the operating time of the currently running methanol pump is timed separately. When the engine is powered off, this operating time is stored in the EEPROM. If the same methanol pump is used again in the next driving cycle, the timer continues based on the previous value. Before each start-up, the difference in operating time ΔT between the two pumps is calculated and identified.

[0079] The "service fairness index" of each pump is dynamically calculated based on the cumulative working time of the two pumps and the most recent switchover time. In the startup decision, if the time difference between the two pumps does not exceed the threshold, but one of the pumps has been selected as the startup pump in the most recent N startups, the other pump is forcibly selected as the startup pump for this time to avoid startup pump monopoly caused by the time difference not reaching the threshold. Here, N is an integer ≥3, and the service fairness index X is calculated by weighting the time difference and the most recent startup frequency, as follows: X=|ΔT|+20N.

[0080] The remaining life of the dual methanol pumps is assessed using the Service Fairness Index. When the Service Fairness Index is greater than or equal to the limit, i.e., when the main methanol pump exceeds the backup methanol pump by 300 hours and the main methanol pump has been started 10 times, and the Service Fairness Index exceeds the calibrated threshold of 500, then the backup methanol pump will build up pressure and complete methanol injection, and the engine will start.

[0081] If a fault is detected in the main methanol pump stored in the previous driving cycle, the backup methanol pump will be activated in this driving cycle to complete methanol injection and start the engine. Similarly, if a fault is detected in the backup methanol pump stored in the previous driving cycle, the main methanol pump will be activated in this driving cycle to complete methanol injection and start the engine.

[0082] After the engine starts successfully, the rail pressure needs to be monitored in real time for any abnormalities. If the rail pressure is consistently below the lower limit or fluctuates significantly, a fault is reported. Simultaneously, the currently running methanol pump is marked and stored in the EEPROM, and the other methanol pump is started. Once the rail pressure stabilizes, the faulty methanol pump is shut down, achieving hot-switching between the two methanol pumps. The primary and backup methanol pumps are driven by two different relays controlled by the ECU. The switching process is as follows: Figure 6 .

[0083] By monitoring the methanol rail pressure in real time and assessing the methanol pump's operating status, when the rail pressure is consistently below the lower limit or fluctuates significantly, the identified status is stored in the EEPROM. Simultaneously, another backup methanol pump is switched to ensure safe and stable engine operation. Before engine start-up, the difference in operating time between the two methanol pumps and any fault reports are evaluated to determine which specific methanol pump to use, ensuring a smooth start and normal operation of the engine. The operating time of both methanol pumps is recorded in real time. When one pump operates for a certain period longer than the other, this status is recorded and stored in the EEPROM. Switching is performed upon the next start-up to ensure that the remaining lifespan of both methanol pumps is similar, maximizing engine lifespan.

[0084] Specifically, when the standby pump is working, the same method described above can be used to determine whether it is necessary to switch to the main pump. This will not be repeated here.

[0085] In the specific implementation process, in the event of an abnormality in the main methanol pump, the main methanol pump is stopped and the standby methanol pump is started. This can be achieved through the following steps: controlling the first relay to open; controlling the second relay to close.

[0086] In this solution, a hardware switching architecture with independent control of dual relays is used to achieve complete electrical isolation and safety interlocking between the main and standby methanol pumps, avoiding the risk of both pumps being powered on simultaneously or having short-term cross-power supply.

[0087] Specifically, to stop the standby pump and start the main pump, the first relay is closed and the second relay is opened.

[0088] As mentioned above, since this solution mentions a control switching scheme for starting dual methanol pumps, during the engine start-up process, by simulating a mechanical failure of one of the methanol pumps A, the engine can automatically switch to the other methanol pump B to ensure that the engine can start smoothly. Similarly, when simulating a failure of methanol pump B, it can automatically switch to methanol pump A to start the engine, which is considered to fall within the protection scope of this application.

[0089] As mentioned above, since this solution addresses the issue of excessively long single-pump operation time, it uses the logic of recording the operation time of both pumps and automatically switching to the other methanol pump upon the next startup. The identification method is as follows: record the operation time of both methanol pumps A and B respectively. If, under the condition that both pumps are functioning properly, one of the methanol pumps A operates during this driving cycle, and the methanol pump B is switched during the startup of the next driving cycle (i.e., switching from A to B), then it is considered to fall within the protection scope of this application.

[0090] As mentioned above, since this solution mentions the technical point of dual-pump thermal switching, by observing the engine operation process and simulating a single pump failure, it is possible to automatically transition to the working state of the other pump without stopping the engine. If it can automatically switch to the working state of the other methanol pump without stopping the engine, it is considered to fall within the protection scope of this application.

[0091] This application also provides a master control device. It should be noted that the master control device in this application can be used to execute the master / standby switching method for dual methanol pumps provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0092] The following describes the main control device provided in the embodiments of this application.

[0093] Figure 7 This is a structural block diagram of the main control device according to an embodiment of this application. For example... Figure 7 As shown, the main control device includes:

[0094] The first acquisition unit 100 is used to acquire the working data of the main methanol pump mentioned above and obtain the first working data. The working data includes one or more of voltage, communication status, temperature, current and rail pressure. The rail pressure is the pressure of methanol in the pipeline.

[0095] The second acquisition unit 200 is used to acquire the operating data of the aforementioned standby methanol pump and obtain the second operating data.

[0096] The first control unit 300 is used to determine whether the main methanol pump is abnormal based on the first working data when the main methanol pump is working, and to control the main methanol pump to stop working and control the standby methanol pump to start working when the main methanol pump is abnormal.

[0097] The second control unit 400 is used to determine whether the backup methanol pump is malfunctioning based on the second working data when the backup methanol pump is working, and to control the backup methanol pump to stop working and control the main methanol pump to start working when the backup methanol pump is malfunctioning.

[0098] In this embodiment, two methanol pumps are designed. When the main methanol pump fails to establish or maintain the methanol rail pressure due to electrical faults, mechanical wear, or performance degradation, the main control equipment identifies the abnormal state, immediately cuts off the power supply to the pump, and starts the backup methanol pump, so that the fuel supply can be switched to the backup pump to continue working without interruption. Conversely, if the backup pump is abnormal while the main pump is normal, the main control equipment can also perform reverse switching to ensure that when either pump fails, the other pump can still independently complete the methanol pressurization and rail pressure establishment, so that the engine can maintain normal starting and running conditions, thereby avoiding downtime losses caused by the failure of a single pump.

[0099] In specific implementation, the first control unit includes a first determining module, a second determining module, and a third determining module. The first determining module is used to determine that the main methanol pump is abnormal if at least one of the following conditions is met: the voltage of the main methanol pump is greater than a preset maximum voltage value, the voltage of the main methanol pump is less than a preset minimum voltage value, the main methanol pump has a communication abnormality, the temperature of the main methanol pump is greater than a preset maximum temperature value, the temperature of the main methanol pump is less than a preset minimum temperature value, the current of the main methanol pump is greater than a preset maximum current value, or the current of the main methanol pump is less than a preset minimum current value. The second determining module is used to calculate the difference between the rail voltage of the main methanol pump at a first moment and the rail voltage of the main methanol pump at a second moment to obtain a rail voltage fluctuation value. If the rail voltage fluctuation value of the main methanol pump is greater than or equal to a preset fluctuation threshold, the main methanol pump is determined to be abnormal. The third determining module is used to determine that the main methanol pump is abnormal if the rail voltage is less than a preset minimum rail voltage value throughout a preset operating period of the main methanol pump.

[0100] In this scheme, the three abnormality determination methods mentioned above cover three typical fault modes: sudden electrical faults, gradual performance degradation, and start-up failure. Through a multi-dimensional approach, it is possible to accurately determine whether the main methanol pump is abnormal.

[0101] In some embodiments, the main control device further includes a first statistical unit, a second statistical unit, a first calculation unit, and a third control unit. The first statistical unit is used to control the main methanol pump to stop working in the event of an abnormality in the main methanol pump, and after controlling the standby methanol pump to start working, to count the working duration of the main methanol pump in one working cycle to obtain a first duration. The second statistical unit is used to count the working duration of the standby methanol pump after the main / standby switchover to obtain a second duration. The first calculation unit is used to calculate the difference between the first duration and the second duration to obtain a first duration difference. The third control unit is used to control the standby methanol pump to stop working and control the main methanol pump to start working when the first duration difference is greater than or equal to a first preset duration threshold.

[0102] In this scheme, by actively executing the load switching mechanism after fault recovery, the runtime balance control of the two methanol pumps is achieved, avoiding the shortened lifespan caused by long-term operation of a single pump.

[0103] In the specific implementation process, the third control unit includes a first control module and a second control module. The first control module is used to determine that the main methanol pump is abnormal when the main methanol pump is restarted and the rail pressure fluctuation value of the main methanol pump is greater than or equal to the preset fluctuation threshold, control the main methanol pump to stop working, and control the standby methanol pump to start working. The second control module is used to determine that the main methanol pump is abnormal when the main methanol pump is restarted and the rail pressure of the main methanol pump is less than the preset minimum rail pressure value within the preset running time, control the main methanol pump to stop working, and control the standby methanol pump to start working.

[0104] In this scheme, if the rail pressure still cannot be established normally after restarting the methanol pump, it can be determined that the methanol pump is abnormal. Then, another normal methanol pump can be controlled to work, thereby further avoiding downtime losses caused by a single pump failure.

[0105] In some embodiments, the above-mentioned device further includes a third statistical unit, a fourth statistical unit, a second calculation unit, a fifth statistical unit, and a fourth control unit. The third statistical unit is used to, after acquiring the working data of the standby methanol pump and obtaining the second working data, calculate the duration of operation of the main methanol pump from the start of the first working cycle to obtain a third duration. The fourth statistical unit is used to calculate the duration of operation of the standby methanol pump from the start of the second working cycle to obtain a fourth duration. The second calculation unit is used to calculate the difference between the third duration and the fourth duration to obtain a second duration difference. The fifth statistical unit is used to calculate the total number of times the main methanol pump has started from the start of the first working cycle to obtain the number of starts. The fourth control unit is used to control the main methanol pump to stop working and control the standby methanol pump to start working when the second duration difference is greater than or equal to a second preset duration threshold and the number of starts is greater than or equal to a preset number threshold.

[0106] In this scheme, the operating time and the number of times the two pumps are started can be compared. If the operating time of a single pump is long and the number of starts is high, in order to extend the service life of the methanol pump, the other methanol pump can be switched to work, thereby further avoiding downtime losses caused by the failure of a single pump.

[0107] In the specific implementation process, the first control unit includes a third control module and a fourth control module. The third control module is used to control the first relay to open; the fourth control module is used to control the second relay to close.

[0108] In this solution, a hardware switching architecture with independent control of dual relays is used to achieve complete electrical isolation and safety interlocking between the main and standby methanol pumps, avoiding the risk of both pumps being powered on simultaneously or having short-term cross-power supply.

[0109] The aforementioned main control device includes a processor and a memory. The first acquisition unit, the second acquisition unit, the first control unit, the second control unit, etc., are all stored as program units in the memory, and the processor executes the program units stored in the memory to achieve the corresponding functions. All of the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0110] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and adjusting kernel parameters can address the problem in existing technologies where a methanol pump malfunction can cause the engine to fail to start or shut down, resulting in downtime losses.

[0111] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0112] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the dual methanol pump master / slave switching method.

[0113] This invention provides a processor for running a program, wherein the program executes the dual methanol pump master / slave switching method.

[0114] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it implements at least the steps of a method for switching between two methanol pumps. The device described herein can be a server, PC, tablet, mobile phone, etc.

[0115] This application also provides a computer program product that, when executed on a data processing device, is adapted to execute a program that initializes a primary / standby switching method for at least the following dual methanol pumps.

[0116] This application also provides a dual methanol pump system, which includes a dual methanol pump device, which is any of the aforementioned dual methanol pump devices; the dual methanol pump device includes a main control device, which is used to execute any of the aforementioned dual methanol pump master / slave switching methods.

[0117] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0118] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0119] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0120] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0121] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0122] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0123] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0124] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0125] 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.

[0126] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover 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 process, method, article, or apparatus. Unless otherwise specified, 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 that element.

[0127] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual methanol pump device, characterized in that, include: Main methanol pump (10); Backup methanol pump (11); The methanol input terminal is connected to the main methanol pump (10) and the standby methanol pump (11) respectively, and the methanol input terminal is used to input methanol; The methanol output terminal is connected to the main methanol pump (10) and the standby methanol pump (11) respectively, and the methanol output terminal is used to output methanol; The main control device (12) is connected to the main methanol pump (10) and the standby methanol pump (11) respectively. The main control device (12) is used to control the main methanol pump (10) to stop working and control the standby methanol pump (11) to start working in the event of an abnormality. The main control device (12) is also used to control the standby methanol pump (11) to stop working and control the main methanol pump (10) to start working in the event of an abnormality.

2. The dual methanol pump device according to claim 1, characterized in that, The dual methanol pump device also includes: The first relay (13) has a first terminal and a second terminal. The first terminal of the first relay (13) is connected to the main control device (12), and the second terminal of the first relay (13) is connected to the main methanol pump (10). The first relay (13) is used to control the power supply circuit of the main methanol pump (10) to be closed or opened. The second relay (14) has a first terminal and a second terminal. The first terminal of the second relay (14) is connected to the main control device (12), and the second terminal of the second relay (14) is connected to the standby methanol pump (11). The second relay (14) is used to control the power supply circuit of the standby methanol pump (11) to be closed or opened.

3. The dual methanol pump device according to claim 1, characterized in that, The dual methanol pump device also includes: The first one-way valve (15) has a first end and a second end. The first end of the first one-way valve (15) is connected to the main methanol pump (10), and the second end of the first one-way valve (15) is connected to the methanol output end. The first one-way valve (15) is used to control the flow direction of the output methanol of the main methanol pump (10). The second check valve (16) has a first end and a second end. The first end of the second check valve (16) is connected to the standby methanol pump (11), and the second end of the second check valve (16) is connected to the methanol output end. The second check valve (16) is used to control the flow direction of methanol output by the standby methanol pump (11).

4. A method for switching between master and standby dual methanol pumps, wherein the method is applied to the master control equipment of the dual methanol pump device according to any one of claims 1 to 3, characterized in that, The method includes: The operating data of the main methanol pump is obtained to obtain the first operating data, wherein the operating data includes one or more of voltage, communication status, temperature, current and rail pressure, and the rail pressure is the pressure of methanol in the pipeline; Obtain the operating data of the standby methanol pump to obtain the second operating data; While the main methanol pump is working, determine whether the main methanol pump is malfunctioning based on the first working data. If the main methanol pump is malfunctioning, control the main methanol pump to stop working and control the standby methanol pump to start working. If the backup methanol pump is operating, determine whether the backup methanol pump is malfunctioning based on the second operating data. If the backup methanol pump is malfunctioning, control the backup methanol pump to stop operating and control the main methanol pump to start operating.

5. The method according to claim 4, characterized in that, Determining whether the main methanol pump is malfunctioning based on the first operating data includes at least one of the following: If at least one of the following conditions is met: the voltage of the main methanol pump is greater than a preset maximum voltage value, the voltage of the main methanol pump is less than a preset minimum voltage value, the main methanol pump has a communication malfunction, the temperature of the main methanol pump is greater than a preset maximum temperature value, the temperature of the main methanol pump is less than a preset minimum temperature value, the current of the main methanol pump is greater than a preset maximum current value, or the current of the main methanol pump is less than a preset minimum current value, the main methanol pump is determined to be malfunctioning. The difference between the rail pressure of the main methanol pump at the first moment and the rail pressure of the main methanol pump at the second moment is calculated to obtain the rail pressure fluctuation value. If the rail pressure fluctuation value of the main methanol pump is greater than or equal to a preset fluctuation threshold, the main methanol pump is determined to be abnormal. If the rail pressure is lower than the preset minimum rail pressure value within the preset operating time of the main methanol pump, the main methanol pump is determined to be malfunctioning.

6. The method according to claim 5, characterized in that, After controlling the main methanol pump to stop working and controlling the standby methanol pump to start working in the event of a malfunction of the main methanol pump, the method further includes: The duration of operation of the main methanol pump in one working cycle is statistically analyzed to obtain the first duration; The second duration is obtained by calculating the operating time of the standby methanol pump after the main / standby switchover. Calculate the difference between the first duration and the second duration to obtain the first duration difference; If the first time difference is greater than or equal to the first preset time threshold, the standby methanol pump is controlled to stop working, and the main methanol pump is controlled to start working.

7. The method according to claim 6, characterized in that, If the first time difference is greater than or equal to a first preset time threshold, the method further includes controlling the standby methanol pump to stop working and controlling the main methanol pump to start working after that: If the main methanol pump is restarted and the rail pressure fluctuation value of the main methanol pump is greater than or equal to the preset fluctuation threshold, the main methanol pump is determined to be abnormal, the main methanol pump is controlled to stop working, and the standby methanol pump is controlled to start working. If the main methanol pump is restarted and the rail pressure is lower than the preset minimum rail pressure value within the preset running time of the main methanol pump, the main methanol pump is determined to be abnormal, the main methanol pump is controlled to stop working, and the standby methanol pump is controlled to start working.

8. The method according to claim 4, characterized in that, After acquiring the operating data of the backup methanol pump and obtaining the second operating data, the method further includes: The duration of operation of the main methanol pump from the start of the first working cycle is used to obtain the third duration. The duration of operation of the backup methanol pump from the start of the second working cycle is calculated to obtain the fourth duration. Calculate the difference between the third duration and the fourth duration to obtain the second duration difference; The total number of times the main methanol pump starts from the first working cycle is counted to obtain the number of starts; If the second duration difference is greater than or equal to the second preset duration threshold, and the number of starts is greater than or equal to the preset number of starts threshold, the main methanol pump is controlled to stop working, and the standby methanol pump is controlled to start working.

9. The method according to claim 4, characterized in that, The dual methanol pump device further includes a first relay and a second relay. The first relay has a first terminal and a second terminal. The first terminal of the first relay is connected to the main control device, and the second terminal of the first relay is connected to the main methanol pump. The first relay is used to control the closing or opening of the power supply circuit of the main methanol pump. The second relay has a first terminal and a second terminal. The first terminal of the second relay is connected to the main control device, and the second terminal of the second relay is connected to the standby methanol pump. The second relay is used to control the closing or opening of the power supply circuit of the standby methanol pump. In the event of an abnormality in the main methanol pump, it controls the main methanol pump to stop working and controls the standby methanol pump to start working, including: Control the first relay to disconnect; Control the second relay to close.

10. A dual methanol pump system, characterized in that, The dual methanol pump system includes: A dual methanol pump device, wherein the dual methanol pump device is the dual methanol pump device according to any one of claims 1 to 3; The dual methanol pump device includes a main control device, which is used to execute the main / standby switching method of the dual methanol pump as described in any one of claims 4 to 9.

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