Engine mode switching method, terminal equipment and computer storage quality

Abstract

This invention discloses an engine mode switching method, a terminal device, and a computer-readable storage medium, comprising: acquiring a first engine coolant temperature of a target engine; when the first engine coolant temperature is less than a preset first temperature threshold, controlling the target engine to enter a fuel rail cleaning mode and acquiring the cleaning duration of the target engine in the fuel rail cleaning mode; when the cleaning duration is greater than or equal to a preset first time threshold, controlling the target engine to enter a gasoline injection mode and acquiring a second engine coolant temperature of the target engine in the gasoline injection mode; when the second engine coolant temperature is greater than or equal to the first temperature threshold, controlling the target engine to enter a methanol injection mode and acquiring a third engine coolant temperature of the target engine in the methanol injection mode; when the third engine coolant temperature is greater than or equal to a preset second temperature threshold, controlling the target engine to enter a methanol fractional injection mode; wherein, the second temperature threshold is greater than the first temperature threshold.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to an engine mode switching method, terminal device, and computer-readable storage medium. Background Technology

[0002] With the rapid development of the automotive industry, methanol is increasingly being used as a fuel for new energy vehicles due to its advantages such as clean emissions and good economy. However, methanol has characteristics such as high latent heat of vaporization and poor volatility at low temperatures, making it difficult for methanol to reach its ignition limit. This makes it difficult for methanol engines to start in low-temperature environments. At the same time, during normal operation of a methanol engine, the low calorific value, large injection volume, and low oil pressure of methanol result in a less ideal atomization and evaporation effect after injection compared to gasoline, which has an adverse effect on the engine cylinder liners.

[0003] However, to address these issues, current technical personnel primarily deploy the gasoline injection system and the methanol injection system as two independent operating units on the methanol engine. That is, during the cold start phase of the methanol engine, only the gasoline injection system is controlled to participate in injection, while after the methanol engine has started, it switches to methanol injection mode and only the methanol injection system is controlled to participate in operation. However, this approach faces the problem that the gasoline injection system may not work for extended periods during the hot summer months, leading to the deterioration of residual gasoline inside the gasoline nozzles and subsequent nozzle blockage.

[0004] In addition, the above method also faces the problem that due to the limited space on the methanol engine, technicians can only install one gasoline injection system and one methanol injection system on the methanol engine. As a result, for high-power heavy-duty methanol engines that require a large amount of methanol injection, the methanol fuel injected by one methanol injection system has the characteristics of low injection pressure and poor atomization quality, which leads to the technical problem of unsatisfactory methanol atomization and evaporation quality. Summary of the Invention

[0005] This invention provides an engine mode switching method, a terminal device, and a computer-readable storage medium, aiming to improve the atomization and evaporation quality of methanol fuel in a target engine, thereby extending the service life of gasoline injectors in the target engine.

[0006] To achieve the above objectives, the present invention provides a method for switching engine modes, the method comprising the following steps:

[0007] The first engine coolant temperature of the target engine is obtained. When the first engine coolant temperature is less than a preset first temperature threshold, the target engine is controlled to enter the oil rail cleaning mode and the cleaning time of the target engine in the oil rail cleaning mode is obtained.

[0008] When the cleaning duration is greater than or equal to a preset first time threshold, the target engine is controlled to enter the gasoline injection mode, and the second engine water temperature of the target engine in the gasoline injection mode is obtained;

[0009] When the second engine water temperature is greater than or equal to the first temperature threshold, the target engine is controlled to enter the methanol injection mode, and the third engine water temperature of the target engine in the methanol injection mode is obtained.

[0010] When the water temperature of the third engine is greater than or equal to a preset second temperature threshold, the target engine is controlled to enter a methanol injection mode; wherein the second temperature threshold is greater than the first temperature threshold.

[0011] Furthermore, the target engine is equipped with a first solenoid valve, a second solenoid valve, a third solenoid valve, a first fuel rail, and a second fuel rail. The first solenoid valve connects the first fuel rail to the gasoline pipeline and controls the flow of gasoline fuel in the first fuel rail. The second solenoid valve connects the methanol pipeline to the first fuel rail and controls the flow of methanol fuel in the first fuel rail. The third solenoid valve is located at the front end of the first fuel rail and connects the first fuel rail to the second fuel rail.

[0012] The steps of controlling the target engine to enter the fuel rail cleaning mode and obtaining the cleaning duration of the target engine in the fuel rail cleaning mode include:

[0013] Adjust the first solenoid valve and the third solenoid valve to the open state, and adjust the second solenoid valve to the closed state to control the target engine to enter the oil rail cleaning mode;

[0014] When the target engine enters the fuel rail cleaning mode, the injection duration of the gasoline fuel injected by the target engine in the fuel rail cleaning mode is detected, and the injection duration is determined as the cleaning duration.

[0015] Furthermore, the step of controlling the target engine to enter the gasoline injection mode includes:

[0016] Adjust the third solenoid valve to the closed state to allow the gasoline fuel to enter the first fuel rail, thereby switching the target engine from the fuel rail cleaning mode to the gasoline injection mode.

[0017] Furthermore, the target engine is also equipped with a methanol pump, which extracts the methanol fuel and delivers the methanol fuel to the methanol pipeline;

[0018] The step of controlling the target engine to enter methanol injection mode includes:

[0019] Control the methanol pump installed in the target engine to perform oil pumping operation;

[0020] When the pumping time of the methanol pump reaches a preset duration, the first solenoid valve is adjusted to switch to the closed state so that the methanol fuel enters the second fuel rail, thereby switching the target engine from the gasoline injection mode to the methanol injection mode.

[0021] Furthermore, the step of controlling the target engine to enter the methanol fractional injection mode includes:

[0022] Adjust the second solenoid valve to the open state so that the methanol pump delivers the extracted methanol fuel into both the first and second fuel rails simultaneously;

[0023] The first and second fuel rails are controlled to inject methanol fuel according to their respective preset injection ratios, thereby switching the target engine from the methanol injection mode to the methanol fractional injection mode.

[0024] Furthermore, after the step of controlling the first fuel rail and the second fuel rail to inject methanol fuel according to their respective preset injection ratios, thereby switching the target engine from the methanol injection mode to the methanol fractional injection mode, the method further includes:

[0025] Detect the methanol level corresponding to the target engine;

[0026] When the methanol level is below a preset methanol threshold, the target engine is controlled to switch from the methanol injection mode to the gasoline injection mode.

[0027] Furthermore, after the step of obtaining the first engine coolant temperature of the target engine, the method further includes:

[0028] When the water temperature of the first engine is greater than or equal to a preset first temperature threshold, the first solenoid valve, the second solenoid valve and the third solenoid valve configured in the target engine are adjusted to the closed state to control the target engine to enter the methanol injection mode.

[0029] Furthermore, after the step of obtaining the first engine coolant temperature of the target engine, the method further includes:

[0030] When the coolant temperature of the first engine is lower than a preset first temperature threshold, the gasoline level line corresponding to the target engine is detected.

[0031] When the gasoline level is below a preset gasoline threshold, the target engine is controlled to skip the fuel rail cleaning mode and directly enter the gasoline injection mode.

[0032] In addition, to achieve the above objectives, the present invention also provides a terminal device, the terminal device comprising: a memory, a processor, and an engine mode switching program stored in the memory and executable on the processor, wherein when the engine mode switching program is executed by the processor, it implements the steps of the engine mode switching method as described above.

[0033] In addition, to achieve the above objectives, the present invention also provides a computer-readable storage medium storing an engine mode switching program, wherein when the engine mode switching program is executed by a processor, it implements the steps of the engine mode switching method as described above.

[0034] The engine mode switching method, terminal device, and computer-readable storage medium provided in this invention embodiment acquire a first engine coolant temperature of the target engine; when the first engine coolant temperature is less than a preset first temperature threshold, control the target engine to enter a fuel rail cleaning mode and acquire the cleaning duration of the target engine in the fuel rail cleaning mode; when the cleaning duration is greater than or equal to a preset first time threshold, control the target engine to enter a gasoline injection mode and acquire a second engine coolant temperature of the target engine in the gasoline injection mode; when the second engine coolant temperature is greater than or equal to the first temperature threshold, control the target engine to enter a methanol injection mode and acquire a third engine coolant temperature of the target engine in the methanol injection mode; when the third engine coolant temperature is greater than or equal to a preset second temperature threshold, control the target engine to enter a methanol fractional injection mode; wherein, the second temperature threshold is greater than the first temperature threshold.

[0035] In this embodiment, when the terminal device is running, it first detects the target engine using an internally configured temperature sensor to obtain the first engine coolant temperature. The obtained first engine coolant temperature is then compared with a first temperature threshold preset by the technician. When the terminal device determines that the first engine coolant temperature is lower than the first temperature threshold, it adjusts the fuel rails configured within the target engine to control the target engine into a fuel rail cleaning mode. The terminal device then obtains the cleaning duration corresponding to this mode. Afterward, it compares the cleaning duration with a preset first time threshold. If the cleaning duration is determined to be greater than or equal to the first time threshold, it adjusts the fuel rails to control the target engine into a gasoline injection mode. Simultaneously, the terminal device... The target engine is detected again by a temperature sensor to obtain the second engine coolant temperature, which is then compared with a first temperature threshold. Next, when the terminal device determines that the second engine coolant temperature is greater than or equal to the first temperature threshold, it adjusts each fuel rail to control the target engine to switch from gasoline injection mode to methanol injection mode. The terminal device then detects the target engine again by a temperature sensor to obtain a third engine coolant temperature. Finally, the terminal device compares the obtained third engine coolant temperature with a preset second temperature threshold, and when it determines that the third engine coolant temperature is greater than or equal to the second temperature threshold, it adjusts each fuel rail to control the target engine to switch from methanol injection mode to methanol fractional injection mode.

[0036] Thus, this invention employs a method of detecting engine coolant temperature and controlling the methanol engine to enter a fuel rail cleaning mode based on that temperature. After fuel rail cleaning is complete, the methanol engine is then controlled to enter a gasoline injection mode. When the engine coolant temperature reaches a preset temperature threshold, the methanol engine switches from gasoline injection mode to methanol injection mode. Similarly, when the engine coolant temperature reaches a preset second temperature threshold, the methanol engine switches from methanol injection mode to methanol fractional injection mode. In other words, this invention uses engine coolant temperature detection and control of the methanol engine to enter a fuel rail cleaning mode, thereby cleaning the fuel rail nozzles by injecting gasoline. This solves the technical problem of residual gasoline inside the gasoline nozzles deteriorating and clogging the nozzles due to prolonged inactivity. Furthermore, by controlling the methanol engine to switch from methanol injection mode to methanol fractional injection mode when the engine coolant temperature reaches the preset second temperature threshold, multiple fuel rails can simultaneously inject methanol fuel, solving the technical problem of unsatisfactory atomization and evaporation quality caused by a single methanol injection system. This achieves the technical effect of improving the atomization and evaporation quality of methanol fuel in the target engine, thereby extending the service life of the gasoline nozzles in the target engine. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the terminal device structure of the hardware operating environment involved in the embodiments of the present invention;

[0038] Figure 2 This is a flowchart illustrating the first embodiment of the engine mode switching method of the present invention;

[0039] Figure 3 This is a flowchart illustrating the third embodiment of the engine mode switching method of the present invention;

[0040] Figure 4 This is a flowchart illustrating the fourth embodiment of the engine mode switching method of the present invention;

[0041] Figure 5 This is a schematic diagram of a methanol engine structure involved in an embodiment of the engine mode switching method of the present invention;

[0042] Figure 6 This is a flowchart illustrating the optimal embodiment of the engine mode switching method of the present invention.

[0043] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0045] Reference Figure 1 , Figure 1 This is a schematic diagram of the terminal device structure of the hardware operating environment involved in the embodiments of the present invention.

[0046] It should be noted that, Figure 1 This can be a schematic diagram of the hardware operating environment of the terminal device. The terminal device in this embodiment of the invention can be a terminal device with solenoid valve control function that executes the engine mode switching method provided by this invention. Specifically, this terminal device can be a data storage control terminal, a PC, or a portable computer, etc.

[0047] like Figure 1As shown, the terminal device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed random access memory (RAM) or a stable non-volatile memory (NVM), such as a disk drive. The memory 1005 may also optionally be a storage device independent of the aforementioned processor 1001.

[0048] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the terminal device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0049] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a data storage module, a network communication module, a user interface module, and an engine mode switching program.

[0050] exist Figure 1 In the terminal device shown, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the terminal device of the present invention can be set in the terminal device. The terminal device calls the engine mode switching program stored in the memory 1005 through the processor 1001 and executes the engine mode switching method provided in the embodiment of the present invention.

[0051] Based on the aforementioned terminal device, various embodiments of the engine mode switching method of the present invention are provided.

[0052] Please refer to Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the engine mode switching method of the present invention.

[0053] It should be understood that although the logical order is shown in the flowchart, in some cases the engine mode switching method of the present invention may of course perform the steps shown or described in a different order than that shown here.

[0054] In this embodiment, the engine mode switching method of the present invention may include the following steps:

[0055] Step S10: Obtain the first engine water temperature of the target engine. When the first engine water temperature is less than a preset first temperature threshold, control the target engine to enter the oil rail cleaning mode and obtain the cleaning time of the target engine in the oil rail cleaning mode.

[0056] The fuel rail cleaning mode is a mode in which gasoline fuel is input into the fuel rail injector assembly when the engine extracts gasoline fuel, and then the gasoline fuel cleans the gasoline nozzles integrated in the fuel rail injector assembly.

[0057] In this embodiment, when the terminal device is running, it detects the methanol engine and obtains the first engine water temperature of the target engine through a temperature sensor configured in the methanol engine. The terminal device then compares the obtained first engine water temperature with a first temperature threshold preset by the technician. When it is determined that the first engine water temperature is less than the first temperature threshold, the terminal device controls the methanol engine to enter the fuel rail cleaning mode. At the same time, the terminal device detects the cleaning time of the methanol engine in the fuel rail cleaning mode.

[0058] Furthermore, in a feasible embodiment, the step of "controlling the target engine to enter the fuel rail cleaning mode and obtaining the cleaning duration of the target engine in the fuel rail cleaning mode" in step S10 above may specifically include:

[0059] Step S101: Adjust the first solenoid valve and the third solenoid valve to the open state, and adjust the second solenoid valve to the closed state to control the target engine to enter the oil rail cleaning mode;

[0060] In this embodiment, the terminal device adjusts the first and third solenoid valves in the methanol engine to the open state, and at the same time, adjusts the second solenoid valve in the methanol engine to the closed state, thereby causing the methanol engine to enter the fuel rail cleaning mode to clean the gasoline nozzles corresponding to the first fuel rail.

[0061] Step S102: When the target engine enters the fuel rail cleaning mode, detect the injection duration of the gasoline fuel injected by the target engine in the fuel rail cleaning mode, and determine the injection duration as the cleaning duration;

[0062] In this embodiment, when the terminal device controls the methanol engine to enter the fuel rail cleaning mode, it controls the timing device configured in the terminal device to detect the methanol engine, so as to determine the injection duration of gasoline fuel injected into the first fuel rail in the methanol engine, and determines the detected injection duration as the cleaning duration.

[0063] For example, please refer to Figure 5 , Figure 5 This is a schematic diagram of a methanol engine structure involved in an embodiment of the engine mode switching method of the present invention, as shown below. Figure 5 The methanol engine is equipped with a fuel rail injector assembly 1, a fuel rail injector assembly 2, a solenoid valve 1, a solenoid valve 2, and a solenoid valve 3. The fuel rail injector assembly 1 is a gasoline-methanol fuel rail injector assembly, primarily used to clean the gasoline nozzles during cold starts and to inject gasoline fuel in gasoline mode. Simultaneously, the fuel rail injector assembly 1 can also inject methanol fuel in a fractional methanol injection mode. Similarly, the fuel rail injector assembly 2 is a methanol fuel rail injector assembly, primarily used to inject methanol fuel in methanol injection mode, and like the fuel rail injector assembly 1, it also performs fractional methanol fuel injection in a fractional methanol injection mode.

[0064] also, Figure 5 Solenoid valve 1 is mainly used to switch the gasoline fuel supplied to the fuel rail injector assembly 1, and solenoid valve 2 is mainly used to switch the methanol fuel supplied to the fuel rail injector assembly 1. The solenoid valves are mainly used to switch the fuel rail cleaning mode of the fuel rail injector assembly 1, the pipeline before the fuel rail injector assembly 1, the pipeline after solenoid valve 1, the pipeline after solenoid valve 2, and the fuel rail cleaning mode of the fuel rail injector assembly 1.

[0065] like Figure 5 As shown, the terminal device controls solenoid valves 1 and 3 configured in the methanol engine through its internal main control chip, adjusting solenoid valves 1 and 3 to the open state. This allows gasoline fuel in the methanol engine to enter the fuel rail injector assembly 1 configured in the methanol engine through solenoid valve 1, thereby cleaning the gasoline nozzles corresponding to the fuel rail injector assembly 1 and putting the methanol engine into the fuel rail cleaning mode. Afterwards, the terminal device controls the timing device through the main control chip to simultaneously detect solenoid valves 1 and 3. The timing device starts timing when it determines that solenoid valves 1 and 3 have switched to the open state, thus determining the injection time of gasoline fuel injected by the fuel rail injector assembly 1 to clean the gasoline nozzles when the methanol engine is in the fuel rail cleaning mode, and this injection time is determined as the cleaning duration.

[0066] Step S20: When the cleaning duration is greater than or equal to a preset first time threshold, control the target engine to enter the gasoline injection mode and obtain the second engine water temperature of the target engine in the gasoline injection mode;

[0067] The gasoline injection mode is a mode in which the gasoline fuel is extracted by the engine, atomized, and then injected to mix the gasoline fuel with air to form a gas mixture. The mixture is then ignited to generate energy, which in turn causes the piston in the engine to move.

[0068] In this embodiment, when the terminal device detects that the cleaning duration of the methanol engine is greater than or equal to a preset first time threshold, it adjusts the methanol engine to switch it from the fuel rail cleaning mode to the gasoline injection mode. At the same time, the terminal device controls the methanol engine to detect it again through a temperature sensor to obtain the second engine water temperature of the methanol engine when switching modes.

[0069] Furthermore, in a feasible embodiment, the step of "controlling the target engine to enter the gasoline injection mode" in step S20 above may specifically include:

[0070] Step S201: Adjust the third solenoid valve to the closed state so that the gasoline fuel enters the first fuel rail, thereby switching the target engine from the fuel rail cleaning mode to the gasoline injection mode;

[0071] For example, the terminal device adjusts the solenoid valve 3 in the methanol engine to the closed state through the main control chip. At the same time, the gasoline pump in the methanol engine extracts gasoline fuel and sends the gasoline fuel to the fuel rail injector assembly 1 through the solenoid valve 1 in the open state, thereby switching the methanol engine from the fuel rail cleaning mode to the gasoline injection mode.

[0072] Step S30: When the second engine water temperature is greater than or equal to the first temperature threshold, control the target engine to enter the methanol injection mode, and obtain the third engine water temperature of the target engine in the methanol injection mode;

[0073] The methanol injection mode is a mode in which the engine extracts methanol fuel, atomizes the extracted methanol fuel, and then injects the atomized methanol fuel to fully mix with air to form a gas mixture. The mixture is then ignited to generate energy, which in turn causes the piston in the engine to move.

[0074] In this embodiment, the terminal device compares the acquired second engine coolant temperature with the first temperature threshold. When it is determined that the second engine coolant temperature is greater than or equal to the first temperature threshold, the terminal device adjusts each oil rail in the methanol engine, thereby adjusting the first oil rail in the methanol engine to a stopped working state and adjusting the second oil rail in the methanol engine to a working state, thereby switching the methanol engine from gasoline injection mode to methanol injection mode. At the same time, the terminal device detects the methanol engine through a temperature sensor, thereby acquiring the third engine coolant temperature of the methanol engine in methanol injection mode.

[0075] Furthermore, in a feasible embodiment, the target engine is also equipped with a methanol pump, wherein the methanol pump extracts methanol fuel and delivers the methanol fuel to the methanol pipeline. The step of "controlling the target engine to enter the methanol injection mode" in step S30 above may specifically include:

[0076] Step S301: Control the methanol pump configured in the target engine to perform oil pumping operation;

[0077] In this embodiment, when the terminal device determines that the water temperature of the second engine is greater than or equal to the first temperature threshold, the terminal device obtains the advance pumping time preset by the technician, and controls the methanol pump in the methanol engine to perform the pumping operation according to the advance pumping time.

[0078] Step S302: When the pumping time of the methanol pump reaches the preset duration, adjust the first solenoid valve to switch to the closed state so that the methanol fuel enters the second fuel rail, thereby switching the target engine from the gasoline injection mode to the methanol injection mode;

[0079] In this embodiment, the terminal device adjusts the first solenoid valve in the methanol engine to the closed state according to the advance pumping time, so that the remaining gasoline fuel in the first fuel rail is injected within the advance pumping time. At the same time, the terminal device controls the methanol pump to input the extracted methanol fuel into the second fuel rail, so that the second fuel rail injects methanol fuel while the first fuel rail completes gasoline injection, thereby switching the methanol engine from gasoline injection mode to methanol injection mode.

[0080] For example, when the terminal device determines that the second engine coolant temperature is greater than or equal to 25°C, it reads the storage device to obtain the pre-pumping time of 5 seconds preset by the technician. Then, the terminal device controls the methanol pump in the methanol engine to perform the pre-pumping operation, and the methanol pump delivers the extracted methanol fuel to the fuel rail injector assembly 2. At the same time, when the methanol pump starts to perform the pre-pumping operation, the terminal device adjusts the solenoid valve 1 to the closed state. Then, the terminal device controls the fuel rail injector assembly 1 to finish injecting the remaining gasoline fuel within the 5 seconds of the methanol pump performing the pre-pumping operation, thereby stopping the operation of the fuel rail injector assembly 1. At the same time that the fuel rail injector assembly 1 finishes its injection operation, the terminal device controls the fuel rail injector assembly 2 to start injecting methanol fuel, thereby switching the methanol engine from gasoline injection mode to methanol injection mode.

[0081] It should be noted that, in this embodiment, the purpose of setting the advance pumping time is mainly to enable the methanol engine to achieve a seamless switch when switching from gasoline injection mode to methanol mode. That is, to avoid the situation where the methanol engine needs to inject all the gasoline fuel in the fuel rail injector assembly 1 before extracting methanol fuel and inputting it into the fuel rail injector assembly 2 to continue methanol injection, which would cause the vehicle to stop during the mode switching process. It is understood that the actual length of the advance pumping time is mainly related to the structure of the methanol engine. Technicians can adjust the advance pumping time according to the structure of the methanol engine, and this invention does not limit this.

[0082] Step S40: When the water temperature of the third engine is greater than or equal to a preset second temperature threshold, control the target engine to enter the methanol fractional injection mode; wherein, the second temperature threshold is greater than the first temperature threshold;

[0083] The methanol injection phased injection mode involves the engine extracting methanol fuel, inputting the extracted methanol fuel into multiple fuel rail injector assemblies configured in the engine, and simultaneously performing atomization operation on the methanol fuel through multiple fuel rail injector assemblies. Then, the multiple fuel rail injector assemblies simultaneously perform injection operation on the atomized methanol fuel to ensure that the methanol fuel is fully mixed with air to form a mixture gas. The mixture gas is ignited to generate energy, thereby causing the piston in the engine to move.

[0084] In this embodiment, the terminal device reads the storage device to obtain a second temperature threshold preset by the technician that is greater than the first temperature threshold, and compares the obtained third engine water temperature with the second temperature threshold. When the terminal device determines that the obtained third engine water temperature is greater than or equal to the preset second temperature threshold, it adjusts each solenoid valve in the methanol engine to control the methanol engine to inject methanol fuel simultaneously through the first oil rail and the second oil rail, so that the methanol engine switches from methanol injection mode to methanol fractional injection mode.

[0085] Furthermore, in a feasible embodiment, the step of "controlling the target engine to enter the methanol fractional injection mode" in step S40 above may specifically include:

[0086] Step S401: Adjust the second solenoid valve to the open state so that the methanol pump delivers the extracted methanol fuel into both the first oil rail and the second oil rail simultaneously;

[0087] In this embodiment, when the terminal device determines that the obtained third engine water temperature is greater than or equal to the second temperature threshold, it adjusts the second solenoid valve in the methanol engine, thereby causing the second solenoid valve to enter the open state, and then causing the methanol fuel extracted by the methanol pump to be input to the first fuel rail through the second solenoid valve.

[0088] Step S402: Control the first fuel rail and the second fuel rail to inject methanol fuel according to their respective preset injection ratios, thereby switching the target engine from the methanol injection mode to the methanol fractional injection mode;

[0089] In this embodiment, the terminal device reads the storage device to obtain the methanol injection ratio corresponding to the first fuel rail and the second fuel rail respectively, and controls the first fuel rail and the second fuel rail to inject methanol fuel in stages according to each methanol injection ratio so that the methanol engine switches from methanol injection mode to methanol staged injection mode.

[0090] For example, when the terminal device determines that the water temperature of the third engine is greater than or equal to 45°C, it adjusts the solenoid valve 2 in the methanol engine, thereby closing the solenoid valves 1 and 3 and opening the solenoid valve 2. This allows the methanol fuel extracted by the methanol pump to enter the fuel rail injector assembly 1 through the solenoid valve 2. At the same time, the terminal device reads the storage device to determine that the injection ratio of each of the fuel rail injector assembly 1 and the fuel rail injector assembly 2 is 0.5. Then, the terminal device controls the fuel rail injector assembly 1 and the fuel rail injector assembly 2 to simultaneously inject methanol fuel at 50% of the methanol injection amount of the fuel rail injector assembly 2 in methanol mode, so that the methanol engine enters the methanol fractional injection mode.

[0091] It should be noted that, in this embodiment, the injection ratios of the fuel rail injector assembly 1 and the fuel rail injector assembly 2 are set by technicians according to the internal structure of the methanol engine. In addition, in another embodiment, when the methanol engine enters the methanol fractional injection mode, the fuel rail injector assembly 1 and the fuel rail injector assembly 2 can be controlled to reduce their respective injection ratios and increase the corresponding number of injections. This further increases the number of injections to improve the atomization quality of the methanol fuel while keeping the total amount of methanol fuel injected by the fuel rail injector assembly 1 and the fuel rail injector assembly 2 constant.

[0092] In this embodiment, during operation, the terminal device detects the methanol engine using a temperature sensor installed within the engine and acquires the first engine coolant temperature. The terminal device then compares the acquired first engine coolant temperature with a first temperature threshold preset by a technician. When the first engine coolant temperature is determined to be lower than the first temperature threshold, the terminal device controls the methanol engine to enter a fuel rail cleaning mode. Simultaneously, the terminal device detects the cleaning duration of the methanol engine in fuel rail cleaning mode. Then, when the terminal device detects that the cleaning duration of the methanol engine is greater than or equal to a preset first time threshold, it adjusts the methanol engine, switching it from fuel rail cleaning mode to gasoline injection mode. Simultaneously, the terminal device controls the methanol engine to detect it again using the temperature sensor to acquire the second engine coolant temperature during the mode switch. Then, the terminal device compares the acquired second engine coolant temperature with the first temperature threshold, and... When the second engine coolant temperature is determined to be greater than or equal to the first temperature threshold, the terminal device adjusts the fuel rails within the methanol engine, thereby adjusting the first fuel rail to a stopped state and adjusting the second fuel rail to a working state, thus switching the methanol engine from gasoline injection mode to methanol injection mode. Simultaneously, the terminal device detects the methanol engine through a temperature sensor to obtain the third engine coolant temperature in methanol injection mode. Finally, the terminal device reads the storage device to obtain a second temperature threshold preset by the technician that is greater than the first temperature threshold, and compares the obtained third engine coolant temperature with the second temperature threshold. When the terminal device determines that the obtained third engine coolant temperature is greater than or equal to the preset second temperature threshold, it adjusts the solenoid valves within the methanol engine to control the methanol engine to simultaneously inject methanol fuel through the first and second fuel rails, thus switching the methanol engine from methanol injection mode to methanol fractional injection mode.

[0093] Thus, this invention employs a method of detecting engine coolant temperature and controlling the methanol engine to enter a fuel rail cleaning mode based on that temperature. After fuel rail cleaning is complete, the methanol engine is then controlled to enter a gasoline injection mode. When the engine coolant temperature reaches a preset temperature threshold, the methanol engine switches from gasoline injection mode to methanol injection mode. Similarly, when the engine coolant temperature reaches a preset second temperature threshold, the methanol engine switches from methanol injection mode to methanol fractional injection mode. In other words, this invention uses engine coolant temperature detection and control of the methanol engine to enter a fuel rail cleaning mode, thereby cleaning the fuel rail nozzles by injecting gasoline. This solves the technical problem of residual gasoline inside the gasoline nozzles deteriorating and clogging the nozzles due to prolonged inactivity. Furthermore, by controlling the methanol engine to switch from methanol injection mode to methanol fractional injection mode when the engine coolant temperature reaches the preset second temperature threshold, multiple fuel rails can simultaneously inject methanol fuel, solving the technical problem of unsatisfactory atomization and evaporation quality caused by a single methanol injection system. This achieves the technical effect of improving the atomization and evaporation quality of methanol fuel in the target engine, thereby extending the service life of the gasoline nozzles in the target engine.

[0094] Furthermore, based on the first embodiment of the engine mode switching method of the present invention described above, a second embodiment of the engine mode switching method of the present invention is proposed herein.

[0095] based on Figure 2 The first embodiment of the engine mode switching method of the present invention, as shown, after the step of "obtaining the first engine coolant temperature of the target engine" in step S10 above, may further include the following steps:

[0096] Step A10: When the water temperature of the first engine is greater than or equal to the preset first temperature threshold, adjust the first solenoid valve, the second solenoid valve and the third solenoid valve configured in the target engine to the closed state to control the target engine to enter the methanol injection mode.

[0097] For example, the terminal device first controls the engine coolant temperature sensor to detect the methanol engine to obtain the first engine coolant temperature. At the same time, the terminal device reads the storage device to obtain the first temperature threshold of 25°C and compares the obtained first engine coolant temperature with the first temperature threshold. Then, when the terminal device determines that the first engine coolant temperature is greater than or equal to 25°C, the terminal device adjusts the solenoid valves 1, 2 and 3 in the methanol engine to the closed state and controls the methanol pump in the methanol engine to extract methanol fuel, thereby inputting the methanol fuel into the fuel rail injector assembly 2 to make the methanol engine enter the methanol injection mode.

[0098] In this embodiment, the present invention controls the methanol engine to directly enter the methanol injection mode when the engine coolant temperature is greater than a preset temperature threshold during the start-up phase. This achieves the goal of controlling the methanol engine to directly enter the methanol injection mode under suitable environmental conditions, thus avoiding the waste of gasoline fuel.

[0099] Furthermore, based on the second embodiment of the engine mode switching method of the present invention described above, a third embodiment of the engine mode switching method of the present invention is proposed herein.

[0100] Please refer to Figure 3 , Figure 3 This is a flowchart illustrating the third embodiment of the engine mode switching method of the present invention.

[0101] Following step S402 above, the engine mode switching method of the present invention may further include the following steps:

[0102] Step B10: Detect the methanol level corresponding to the target engine;

[0103] In this embodiment, the terminal device calls its internally configured detection device to detect the methanol fuel storage device containing methanol fuel in the target engine to determine the real-time methanol level of the target engine.

[0104] Step B20: When the methanol level is lower than the preset methanol threshold, control the target engine to switch from the methanol injection mode to the gasoline injection mode;

[0105] In this embodiment, the terminal device reads the storage device to obtain the methanol threshold preset by the technician, and compares the obtained methanol level line with the methanol threshold. When the terminal device determines that the methanol level line of the target engine is lower than the methanol threshold, it adjusts the target engine to make the target engine enter the gasoline injection mode.

[0106] For example, when the target engine is in methanol injection mode or methanol fractional injection mode, the terminal device calls the detection device to detect the methanol fuel storage tank set in the target engine to obtain the real-time methanol level of the target engine. At the same time, the terminal device reads the storage device to obtain the methanol threshold and compares the obtained methanol level with the methanol threshold. Then, when the terminal device determines that the methanol level is lower than the methanol threshold, the terminal device determines that the vehicle's range is insufficient, and then adjusts the solenoid valve 1 in the methanol engine to the open state and adjusts the solenoid valves 2 and 3 to the closed state. At the same time, the terminal device controls the methanol pump to stop working and controls the gasoline pump to extract gasoline fuel and input it to the fuel rail injector assembly 1, thereby switching the target engine to the gasoline injection mode of injecting gasoline fuel through the fuel rail injector assembly 1.

[0107] It should be noted that, in another embodiment, the terminal device can further calculate the target engine's driving range in methanol mode based on the residual amount of methanol fuel when it detects that the methanol level is lower than the methanol threshold, compare the driving range with the preset driving range threshold, and then perform the operation of controlling the methanol engine to switch from methanol injection mode to gasoline injection mode when it is determined that the driving range is less than the driving range threshold.

[0108] In another embodiment, the terminal device can further detect the gasoline level in the target engine when the methanol level is detected to be lower than the methanol threshold. When the gasoline level is also lower than the preset gasoline threshold, the terminal device generates a corresponding warning message and outputs the warning message through the display device configured in the vehicle corresponding to the methanol engine to remind the driver. At the same time, the terminal device determines the nearest gas station to the target engine based on the map data stored in the storage device and guides the driver to drive to the target gas station.

[0109] In this embodiment, the terminal device calls the internally configured detection device to detect the methanol fuel storage device in the target engine to determine the real-time methanol level of the target engine. Then, the terminal device reads the storage device to obtain the methanol threshold preset by the technician, and compares the obtained methanol level with the methanol threshold. When the terminal device determines that the methanol level of the target engine is lower than the methanol threshold, it adjusts the target engine to put the target engine into gasoline injection mode.

[0110] Thus, the present invention detects the residual amount of methanol fuel when the methanol engine enters the methanol injection mode, and controls the methanol engine to switch to the gasoline injection mode when the residual amount of methanol is insufficient, thereby achieving the goal of enabling the target vehicle to maintain its range with gasoline fuel when the methanol fuel reserve is insufficient.

[0111] Furthermore, based on the third embodiment of the engine mode switching method of the present invention described above, a fourth embodiment of the engine mode switching method of the present invention is proposed here.

[0112] Please refer to Figure 4 , Figure 4 This is a flowchart illustrating the fourth embodiment of the engine mode switching method of the present invention.

[0113] Following step S10 above, the engine mode switching method of the present invention may further include the following steps:

[0114] Step C10: When the coolant temperature of the first engine is lower than a preset first temperature threshold, detect the gasoline level line corresponding to the target engine;

[0115] In this embodiment, when the terminal device determines that the first engine coolant temperature is less than the first temperature threshold, it calls the internally configured detection device to detect the gasoline fuel storage device in the target engine to determine the real-time gasoline level of the target engine.

[0116] Step C20: When the gasoline level is lower than the preset gasoline threshold, control the target engine to skip the fuel rail cleaning mode and directly enter the gasoline injection mode;

[0117] In this embodiment, the terminal device reads the storage device to obtain the gasoline threshold preset by the technician, and compares the obtained gasoline level line with the gasoline threshold. When the terminal device determines that the gasoline level line of the target engine is lower than the gasoline threshold, it adjusts the target engine so that the target engine skips the fuel rail cleaning mode and directly enters the gasoline injection mode.

[0118] For example, when the methanol engine is in the start-up state, the terminal device calls the engine coolant temperature sensor to detect the methanol engine and obtain the first engine coolant temperature at startup. Then, the terminal device compares the obtained first engine coolant temperature with a first temperature threshold of 25°C. When it is determined that the first engine coolant temperature is lower than the first temperature threshold of 25°C, the terminal device calls the detection device to detect the gasoline fuel storage tank set in the methanol engine to obtain the real-time gasoline level line of the methanol engine. At the same time, the terminal device reads the storage device to obtain the gasoline threshold and compares the obtained gasoline level line with the gasoline threshold. Then, when the terminal device determines that the gasoline level line is lower than the gasoline threshold, the terminal device adjusts the solenoid valve 1 in the methanol engine to the open state and adjusts the solenoid valves 2 and 3 to the closed state. After that, the terminal device controls the gasoline pump to enter the working state and extracts gasoline fuel and inputs it into the fuel rail injector assembly 1, so that the methanol engine skips the fuel rail cleaning mode and directly enters the gasoline injection mode when starting.

[0119] In this embodiment, when the terminal device determines that the first engine coolant temperature is less than the first temperature threshold, it calls the internally configured detection device to detect the gasoline fuel storage device in the target engine to determine the real-time gasoline level of the target engine. Then, the terminal device reads the storage device to obtain the gasoline threshold preset by the technician and compares the obtained gasoline level with the gasoline threshold. When the terminal device determines that the gasoline level of the target engine is lower than the gasoline threshold, it adjusts the target engine so that the target engine skips the fuel rail cleaning mode and directly enters the gasoline injection mode.

[0120] Thus, this invention detects the remaining amount of gasoline fuel during the methanol engine start-up phase and controls the methanol engine to directly execute the gasoline injection mode when insufficient gasoline is detected. This achieves the goal of avoiding the problem that the methanol engine may not have enough remaining gasoline fuel to raise the engine temperature to the point of switching to methanol injection mode during the fuel rail cleaning process due to insufficient gasoline fuel reserves.

[0121] Furthermore, based on the various embodiments of the engine mode switching method of the present invention described above, an optimal embodiment of the engine mode switching method of the present invention is proposed herein.

[0122] Please refer to Figure 6 , Figure 6 This is a flowchart illustrating the optimal embodiment of the engine mode switching method of the present invention.

[0123] like Figure 6 As shown, in this embodiment, when the terminal device is running, it first detects the engine water temperature and obtains the first engine water temperature T1 of the methanol engine at the time of startup by using the engine water temperature sensor configured in the methanol engine. At the same time, the terminal device reads the storage device to determine that the first temperature threshold preset by the technician is 25°C. Then, the terminal device compares the obtained first engine water temperature with the first temperature threshold 25°C. When the terminal device determines that the first engine water temperature is lower than 25°C, the terminal device adjusts the methanol engine to open the solenoid valve 1 and solenoid valve 3 in the methanol engine, thereby causing the methanol engine to enter the fuel rail cleaning mode. At the same time, the terminal device calls the timing device to detect the cleaning time of the methanol engine in the fuel rail cleaning mode.

[0124] Subsequently, the terminal device first reads the storage device to obtain the first time threshold preset by the technician, and determines that the duration corresponding to the first time threshold is 3 seconds. The terminal device compares the obtained cleaning time with the first time threshold, and when it is determined that the flushing time is greater than or equal to 3 seconds, it adjusts the solenoid valve 3 to the closed state to control the methanol engine to switch from the fuel rail cleaning mode to the gasoline injection mode. At the same time, when the methanol engine switches modes, the terminal device controls the engine water temperature sensor to detect the methanol engine again and obtain the second engine water temperature T2. The terminal device compares the obtained second engine water temperature T2 with the first temperature threshold t1, and when it is determined that the second engine water temperature T2 is greater than or equal to 25°C, the terminal device controls the gasoline pump in the methanol engine to stop working and adjusts the solenoid valve 1 to the closed state, thereby causing the fuel rail injector assembly 1 in the methanol engine to end the gasoline injection mode and stop working. At the same time, the terminal device controls the methanol pump configured in the methanol engine to extract methanol fuel and input the methanol fuel into the fuel rail injector assembly 2 in the methanol engine to cause the methanol engine to enter the methanol injection mode.

[0125] Next, the terminal device controls the engine coolant temperature sensor to detect the methanol engine again to obtain the third engine coolant temperature T3 in methanol injection mode. At the same time, the terminal device reads the storage device to obtain the second temperature threshold t2 preset by the technician, which is greater than 25°C, and determines that the second temperature threshold t2 is 45°C. Then, the terminal device compares the third engine coolant temperature T3 with the second temperature threshold t2. When it is determined that the third engine coolant temperature T3 is greater than or equal to 45°C, it adjusts the solenoid valve in the methanol engine to the open state, so that methanol fuel enters both fuel rail injector assembly 1 and fuel rail injector assembly 2 at the same time, thereby switching the methanol engine from methanol injection mode to methanol fractional injection mode.

[0126] It should be noted that in this embodiment, when the terminal device determines that the first engine water temperature T1 is greater than or equal to 25°C, the terminal device determines to control the methanol engine to start directly with methanol fuel, thereby directly adjusting the solenoid valves 1, 2 and 3 in the methanol engine to the closed state, and controlling the methanol pump in the methanol engine to extract methanol fuel and input the methanol fuel into the fuel rail injector assembly 2, thereby causing the methanol engine to directly enter the methanol injection mode.

[0127] Furthermore, the present invention also provides a terminal device having an engine mode switching program that can run on a processor. When the terminal device executes the engine mode switching program, it implements the steps of the engine mode switching method as described in any of the above embodiments.

[0128] The specific embodiments of the terminal device of the present invention are basically the same as the embodiments of the engine mode switching method described above, and will not be repeated here.

[0129] Furthermore, the present invention provides a computer-readable storage medium storing an engine mode switching program, which, when executed by a processor, implements the steps of the engine mode switching method as described in any of the above embodiments.

[0130] The specific embodiments of the computer-readable storage medium of this invention are basically the same as the embodiments of the engine mode switching method described above, and will not be repeated here.

[0131] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. 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 system that includes that element.

[0132] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0133] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of 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 the present invention, 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, optical disk) as described above, and includes several instructions to cause a terminal device (which can be a terminal device with solenoid valve control function and executing the engine mode switching method provided by the present invention, specifically a data storage control terminal, PC, or portable computer, etc.) to execute the methods described in the various embodiments of the present invention.

[0134] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for switching engine modes, characterized in that, The target engine is equipped with a first solenoid valve, a second solenoid valve, a third solenoid valve, a first fuel rail, and a second fuel rail. The first solenoid valve connects the first fuel rail to the gasoline pipeline and controls the flow of gasoline fuel in the first fuel rail. The second solenoid valve connects the methanol pipeline to the first fuel rail and controls the flow of methanol fuel in the first fuel rail. The third solenoid valve is located at the front end of the first fuel rail and connects the first fuel rail to the second fuel rail. The engine mode switching method includes the following steps: The first engine coolant temperature of the target engine is obtained. When the first engine coolant temperature is less than a preset first temperature threshold, the first solenoid valve and the third solenoid valve are adjusted to the open state, and the second solenoid valve is adjusted to the closed state to control the target engine to enter the oil rail cleaning mode. When the target engine enters the fuel rail cleaning mode, the injection duration of the gasoline fuel injected by the target engine in the fuel rail cleaning mode is detected, and the injection duration is determined as the cleaning duration; When the cleaning duration is greater than or equal to a preset first time threshold, the target engine is controlled to enter the gasoline injection mode, and the second engine water temperature of the target engine in the gasoline injection mode is obtained; When the second engine water temperature is greater than or equal to the first temperature threshold, the target engine is controlled to enter the methanol injection mode, and the third engine water temperature of the target engine in the methanol injection mode is obtained. When the water temperature of the third engine is greater than or equal to a preset second temperature threshold, the target engine is controlled to enter a methanol injection mode; wherein the second temperature threshold is greater than the first temperature threshold.

2. The engine mode switching method as described in claim 1, characterized in that, The step of controlling the target engine to enter the gasoline injection mode includes: Adjust the third solenoid valve to the closed state to allow the gasoline fuel to enter the first fuel rail, thereby switching the target engine from the fuel rail cleaning mode to the gasoline injection mode.

3. The engine mode switching method as described in claim 2, characterized in that, The target engine is also equipped with a methanol pump, which extracts the methanol fuel and delivers the methanol fuel to the methanol pipeline; The step of controlling the target engine to enter methanol injection mode includes: Control the methanol pump installed in the target engine to perform oil pumping operation; When the pumping time of the methanol pump reaches a preset duration, the first solenoid valve is adjusted to switch to the closed state so that the methanol fuel enters the second fuel rail, thereby switching the target engine from the gasoline injection mode to the methanol injection mode.

4. The engine mode switching method as described in claim 3, characterized in that, The step of controlling the target engine to enter the methanol fractional injection mode includes: Adjust the second solenoid valve to the open state so that the methanol pump delivers the extracted methanol fuel into both the first and second fuel rails simultaneously; The first and second fuel rails are controlled to inject methanol fuel according to their respective preset injection ratios, thereby switching the target engine from the methanol injection mode to the methanol fractional injection mode.

5. The engine mode switching method as described in claim 4, characterized in that, After the step of controlling the first fuel rail and the second fuel rail to inject methanol fuel according to their respective preset injection ratios, thereby switching the target engine from the methanol injection mode to the methanol fractional injection mode, the method further includes: Detect the methanol level corresponding to the target engine; When the methanol level is below a preset methanol threshold, the target engine is controlled to switch from the methanol injection mode to the gasoline injection mode.

6. The engine mode switching method as described in claim 1, characterized in that, After the step of obtaining the first engine coolant temperature of the target engine, the method further includes: When the water temperature of the first engine is greater than or equal to a preset first temperature threshold, the first solenoid valve, the second solenoid valve and the third solenoid valve configured in the target engine are adjusted to the closed state to control the target engine to enter the methanol injection mode.

7. The engine mode switching method as described in claim 1, characterized in that, After the step of obtaining the first engine coolant temperature of the target engine, the method further includes: When the coolant temperature of the first engine is lower than a preset first temperature threshold, the gasoline level line corresponding to the target engine is detected. When the gasoline level is below a preset gasoline threshold, the target engine is controlled to skip the fuel rail cleaning mode and directly enter the gasoline injection mode.

8. A terminal device, characterized in that, The terminal device includes: a memory, a processor, and an engine mode switching program stored in the memory and executable on the processor. When the engine mode switching program is executed by the processor, it implements the steps of the engine mode switching method as described in any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores an engine mode switching program, which, when executed by a processor, implements the steps of the engine mode switching method as described in any one of claims 1 to 7.

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