Methanol engine mode control method, electronic device, and storage medium

Abstract

This application discloses a methanol engine mode control method, electronic device, and storage medium, belonging to the field of engine technology. The method includes: acquiring the vehicle speed of the vehicle containing the methanol engine; determining whether the vehicle speed meets preset starting conditions; if the vehicle speed meets the preset starting conditions, acquiring a first starting command; detecting a first coolant temperature of the methanol engine based on the first starting command; if the first coolant temperature is within a preset temperature range, controlling the methanol pump connected to the methanol engine to perform a self-check; and after the self-check is completed, controlling the methanol engine to start and run in methanol mode. This application achieves the technical effect of reducing methanol engine fuel consumption and emissions by combining the vehicle speed and the first coolant temperature to determine whether to perform a self-check on the methanol pump, and starting and running in methanol mode after the self-check.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to a methanol engine mode control method, electronic equipment, and storage medium. Background Technology

[0002] With the implementation of dual-carbon technologies in the automotive industry, methanol fuel is gaining increasing attention due to its advantages as a clean energy source. However, due to the characteristics of methanol fuel, it is difficult or even impossible to ignite at low temperatures. Therefore, current methanol engine fuel supply systems include both methanol and gasoline fuel supply systems, with the methanol supply system being the commonly used system and the gasoline supply system only used for cold starts.

[0003] However, even though the gasoline supply system is only used for cold starts, the fuel consumption and emissions generated during the start-up process are still at a high level. Summary of the Invention

[0004] The main objective of this application is to provide a methanol engine mode control method, electronic device, and storage medium, which aims to solve the problems of high fuel consumption and emissions in current methanol engines.

[0005] To achieve the above objectives, this application provides a methanol engine mode control method, the method comprising:

[0006] Obtain the vehicle speed value of the vehicle where the methanol engine is located, and determine whether the vehicle speed value meets the preset start-up conditions;

[0007] If the vehicle speed value meets the preset starting conditions, a first starting command is obtained, and the first water temperature value of the methanol engine is detected according to the first starting command;

[0008] If the first water temperature value is within the preset temperature range, the methanol pump connected to the methanol engine is controlled to perform a self-test. After the self-test is completed, the methanol engine is controlled to start and run in methanol mode.

[0009] Optionally, the step of determining whether the vehicle speed value meets the preset starting conditions includes:

[0010] If the vehicle speed value is greater than a preset vehicle speed threshold, or the duration of the vehicle speed value being zero is greater than a preset duration, then the vehicle speed value is determined to meet the preset start-up condition.

[0011] If the vehicle speed value is less than or equal to the preset vehicle speed threshold, or the duration of the vehicle speed value being zero is less than or equal to the preset duration, then it is determined that the vehicle speed value does not meet the preset start condition.

[0012] Optionally, after the step of determining that the vehicle speed value does not meet the preset starting condition if the vehicle speed value is less than or equal to the preset vehicle speed value, or if the duration of the vehicle speed value being zero is less than or equal to the preset duration, the method further includes:

[0013] Obtain a second start command, and detect whether the methanol engine has a gasoline mode start record within a preset time period based on the second start command;

[0014] If no gasoline mode start-up record is detected in the methanol engine within a preset time period, the methanol engine is controlled to start and run in gasoline mode.

[0015] Optionally, after the steps of obtaining the second start command and detecting whether the methanol engine has a gasoline mode start record within a preset time period based on the second start command, the method further includes:

[0016] If a gasoline mode start-up record is detected within a preset time period, the second water temperature value of the methanol engine is obtained.

[0017] If the second water temperature value is greater than or equal to the preset temperature threshold, the methanol engine is controlled to start and run in methanol mode.

[0018] If the second water temperature value is less than the preset temperature threshold, the methanol engine is controlled to start and run in gasoline mode, wherein the preset temperature threshold is the same as the upper limit of the preset temperature range.

[0019] Optionally, before the step of detecting the first water temperature value of the methanol engine according to the first start command, the method further includes:

[0020] The system detects whether the methanol engine has a gasoline mode start-up record within a preset time period.

[0021] If a gasoline mode start record is detected within a preset time period, then the step of detecting the first water temperature value of the methanol engine according to the first start command is executed.

[0022] If no gasoline mode start-up record is detected in the methanol engine within a preset time period, the methanol engine is controlled to start and run in gasoline mode.

[0023] Optionally, after the steps of obtaining a first start command if the vehicle speed value meets the preset start condition, and detecting the first water temperature value of the methanol engine according to the first start command, the method further includes:

[0024] If the first water temperature value is greater than the upper limit of the preset temperature range, then the methanol engine is controlled to start and run in methanol mode.

[0025] If the first water temperature value is less than the lower limit of the preset temperature range, the methanol engine is controlled to start and run in gasoline mode.

[0026] Optionally, the step of controlling the methanol pump connected to the methanol engine to perform a self-test, and then controlling the methanol engine to start and run in methanol mode after the self-test is completed includes:

[0027] Controls the activation of the relay connected to the methanol pump;

[0028] If the relay's engagement time exceeds the preset engagement duration, the methanol engine is controlled to start and run in methanol mode.

[0029] Optionally, after the step of controlling the methanol engine to start and operate in gasoline mode, the method further includes:

[0030] The starting water temperature of the methanol engine is detected, and a preset switching water temperature threshold and a preset running time threshold associated with the starting water temperature are obtained.

[0031] The operating water temperature value of the methanol engine in gasoline mode is obtained. If the operating water temperature value is greater than the preset switching water temperature threshold and the operating time in gasoline mode is greater than the preset operating time threshold, the methanol engine is controlled to switch from gasoline mode to methanol mode.

[0032] In addition, to achieve the above objectives, this application also provides an electronic device, the electronic device comprising: a memory, a processor, and a methanol engine mode control program stored in the memory and executable on the processor, the methanol engine mode control program being configured to implement the steps of the methanol engine mode control method as described above.

[0033] In addition, to achieve the above objectives, this application also provides a storage medium, which is a computer-readable storage medium, on which a methanol engine mode control program is stored. When the methanol engine mode control program is executed by a processor, it implements the steps of the methanol engine mode control method described above.

[0034] The methanol engine mode control method provided in this application obtains the vehicle speed of the vehicle where the methanol engine is located and determines whether the vehicle speed meets preset starting conditions. If the vehicle speed meets the preset starting conditions, a first starting command is obtained, and a first water temperature value of the methanol engine is detected according to the first starting command. If the first water temperature value is within a preset temperature range, the methanol pump connected to the methanol engine is controlled to perform a self-check. After the self-check is completed, the methanol engine is controlled to start and run in methanol mode. When the vehicle speed meets the preset starting conditions, the user's perception of the methanol engine's starting speed is weak. If the first water temperature value meets the temperature conditions required for the self-check, a self-check is performed to establish methanol oil pressure. After the self-check is completed, the methanol engine is started and run. This allows for delayed start-up through self-check under temperature conditions where methanol atomization is poor, without affecting drivability and power, while increasing the probability of using methanol mode, reducing the running time of gasoline mode, and reducing fuel consumption and emissions. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of an electronic device in the hardware operating environment involved in the embodiments of this application;

[0036] Figure 2 This is a flowchart illustrating the first embodiment of the methanol engine mode control method of this application;

[0037] Figure 3 This is a schematic diagram of the component structure of the methanol-powered vehicle involved in the methanol engine mode control method of this application;

[0038] Figure 4 This is a schematic diagram of the methanol fuel supply system involved in the methanol engine mode control method of this application;

[0039] Figure 5 This is a flowchart illustrating the second embodiment of the methanol engine mode control method of this application;

[0040] Figure 6 This is a flowchart illustrating the third embodiment of the methanol engine mode control method of this application;

[0041] Figure 7 This is a flowchart illustrating the fourth embodiment of the methanol engine mode control method of this application;

[0042] Figure 8 This is a flowchart illustrating the fifth embodiment of the methanol engine mode control method of this application.

[0043] Explanation of reference numerals in the attached figures

[0044] 101 VCU 102 EMS 103 methanol engine 104 Methanol fuel supply system 105 Gasoline fuel supply system 106 Communication lines 107 fuel delivery pipeline 201 methanol pump 202 Methanol pump circuit 203 Methanol oil circuit 204 relay 205 Methanol fuel tank 206 wire

[0045] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0047] Methanol fuel offers advantages in both emissions and fuel economy. When economic efficiency and emissions are paramount considerations, the gasoline mode operation time after gasoline start-up should be minimized. Therefore, generally, when the engine coolant temperature is below a certain minimum, the engine management system controls the engine to start in gasoline mode. Once the gasoline start-up is successful and the engine has warmed up to the required conditions (engine coolant temperature greater than the gasoline-to-methanol switching temperature, and operation exceeding the minimum time limit), the engine management system controls the fuel supply system to switch from gasoline mode to methanol mode. When the engine coolant temperature is not lower than the aforementioned minimum temperature, the engine management system controls the engine to start and operate in methanol mode.

[0048] In another strategy, when the engine coolant temperature is below a certain higher temperature T, the engine management system controls the engine to start in gasoline mode. After successful gasoline start-up and warm-up to the required conditions (engine coolant temperature greater than the gasoline-to-methanol switching temperature, and operation exceeding the minimum time limit), the engine management system controls the fuel supply system to switch from gasoline mode to methanol mode. When the engine coolant temperature is not lower than the aforementioned higher temperature, the engine management system controls the engine to start and operate in methanol mode. However, this strategy significantly increases the gasoline running time of the methanol engine after starting at normal and low temperatures, resulting in decreased emissions and fuel economy. To achieve dual-carbon goals and meet future, more stringent emission regulations, and to ensure the competitiveness of methanol engines in range-extended and hybrid vehicles, the above strategies still need further optimization.

[0049] The main technical solution of this application embodiment is as follows: obtain the vehicle speed value of the vehicle where the methanol engine is located, and determine whether the vehicle speed value meets the preset starting conditions; if the vehicle speed value meets the preset starting conditions, obtain a first starting command, and detect the first water temperature value of the methanol engine according to the first starting command; if the first water temperature value is within the preset temperature range, control the methanol pump connected to the methanol engine to perform a self-test, and after the self-test is completed, control the methanol engine to start and run in methanol mode.

[0050] Reference Figure 1 , Figure 1 This is a schematic diagram of the electronic device structure of the hardware operating environment involved in the embodiments of this application.

[0051] like Figure 1As shown, the electronic 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 or 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.

[0052] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the electronic device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0053] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and a methanol engine mode control program.

[0054] exist Figure 1 In the electronic 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 electronic device of this application can be set in the electronic device, and the electronic device calls the methanol engine mode control program stored in the memory 1005 through the processor 1001 and executes the methanol engine mode control method provided in the embodiment of this application.

[0055] This application provides a methanol engine mode control method, referring to... Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of a methanol engine mode control method according to this application.

[0056] In this embodiment, the methanol engine mode control method includes:

[0057] Step S10: Obtain the vehicle speed value of the vehicle where the methanol engine is located, and determine whether the vehicle speed value meets the preset start-up conditions;

[0058] In this embodiment, the executing entity can be an EMS (Engine Management System). The EMS is connected to the methanol engine via a communication line, allowing the EMS to control the methanol engine. A methanol engine is an engine that uses methanol as its primary fuel. The fuel supply system of a methanol engine can include a methanol fuel supply system and a gasoline fuel supply system, with the methanol fuel supply system being the more commonly used system.

[0059] Methanol engines can be installed in hybrid or range-extended vehicles to provide power. Vehicles equipped with methanol engines are also known as methanol-powered vehicles, meaning they are driven by the power generated from the combustion of methanol. Figure 3 This is a schematic diagram of the component structure of a methanol-powered vehicle, such as... Figure 3 As shown, a methanol-powered vehicle may include a methanol engine 103, a methanol fuel supply system 104, a gasoline fuel supply system 105, an EMS 102, and a VCU (Vehicle Control Unit) 101. The EMS 102 can communicate with the methanol engine 103 via a communication line 106, such as a CAN (Controller Area Network) bus, to control the starting status of the methanol engine 103. The EMS 102 can also communicate with the methanol fuel supply system 104 and the gasoline fuel supply system 105 respectively, controlling the different fuel supply systems to supply fuel to the methanol engine 103. The methanol fuel supply system 104 and the gasoline fuel supply system 102 are also mechanically connected to the methanol engine 103 via fuel delivery pipes 107 to supply fuel to the methanol engine 103. The VCU 101 and the EMS 102 are communicatively connected and can exchange commands. The methanol fuel supply system may also include a methanol pump, which pumps methanol fuel from the methanol tank to the methanol engine.

[0060] Preset start-up conditions refer to the conditions that the vehicle speed must meet to establish methanol oil pressure in advance when it is determined that the methanol engine needs to be started. Based on whether the vehicle speed meets the preset start-up conditions, different types of start-up commands can be obtained, and the appropriate temperature value can be determined for selecting different start-up modes.

[0061] Step S20: If the vehicle speed value meets the preset starting conditions, a first starting command is obtained, and the first water temperature value of the methanol engine is detected according to the first starting command.

[0062] The first start command can be considered as an instruction to use a lower temperature value as the basis for selecting the start mode, and may include information about a preset temperature range. The first water temperature value can be the value obtained by detecting the water temperature of the methanol engine after the first start is detected, or it can be the value obtained by detecting the water temperature of the methanol engine after determining that it needs to be started. It is understood that the liquid in the engine water tank includes not only water but also coolant; that is, the first water temperature value refers to the temperature of the liquid in the engine water tank. The definitions of each water temperature value in the embodiments of this application can refer to the first water temperature value.

[0063] If the vehicle speed meets the preset starting conditions, it indicates that the delayed start of the methanol engine has little impact on drivability and power. Whether a self-check is needed can be determined by checking if the first coolant temperature meets certain temperature conditions. If it is necessary to check the first coolant temperature, a detection command can be sent to the coolant temperature sensor installed in the engine radiator to obtain the first coolant temperature value fed back by the sensor.

[0064] Step S30: If the first water temperature value is within the preset temperature range, control the methanol pump connected to the methanol engine to perform a self-test. After the self-test is completed, control the methanol engine to start running in methanol mode.

[0065] The preset temperature range refers to the temperature conditions determined after the methanol pump performs a self-test to start in methanol mode. If the first water temperature value is within the preset temperature range, it means that methanol fuel pressure can be established through the self-test, improving the starting performance of methanol at lower temperatures. Methanol fuel pressure can be considered as the pressure of the methanol injector in the methanol fuel supply system. The preset temperature range can be set according to the atomization performance of methanol. When the first water temperature value is within the preset temperature range, the atomization performance of methanol is poor, but the starting performance can be improved by establishing methanol fuel pressure through the methanol pump's self-test. For example, the preset temperature range can be set to 25-50℃.

[0066] In some feasible implementations, controlling the methanol pump connected to the methanol engine to perform a self-test, and then controlling the methanol engine to start and run in methanol mode after the self-test is completed, may include:

[0067] Step S31: Control the relay connected to the methanol pump to engage;

[0068] A relay is an electrical control device. In this embodiment, the operating state of the relay is related to the operation of the methanol pump. Figure 4 This is a schematic diagram of a methanol fuel supply system, such as... Figure 4 As shown, the methanol pump is connected to the methanol tank, allowing it to pump out methanol fuel from the tank. The methanol pump is also connected to a relay; the relay's activation or deactivation controls the pump's operation. After the relay activates, the methanol pump performs a self-test in the circuit.

[0069] Step S32: If the activation time of the relay exceeds the preset activation duration, control the methanol engine to start and run in methanol mode.

[0070] The methanol pump's self-test process has a certain duration, which can be represented by the relay's pull-in time. The preset pull-in time refers to the conditions that the pull-in time should meet. If the pull-in time exceeds the preset pull-in time, the methanol oil pressure can be considered established, and the pump can start operating in methanol mode. The preset pull-in time can be set to 1.5 seconds, ensuring sufficient time to establish methanol oil pressure without affecting the vehicle's drivability and power due to excessive duration.

[0071] In this embodiment, the vehicle speed of the vehicle containing the methanol engine is obtained, and it is determined whether the vehicle speed meets the preset starting conditions. If the vehicle speed meets the preset starting conditions, a first starting command is obtained, and the first water temperature of the methanol engine is detected according to the first starting command. If the first water temperature is within a preset temperature range, the methanol pump connected to the methanol engine is controlled to perform a self-check. After the self-check is completed, the methanol engine is controlled to start and run in methanol mode. When the vehicle speed meets the preset starting conditions, the user's perception of the methanol engine's starting speed is weak. If the first water temperature meets the temperature conditions required for the self-check, a self-check is performed to establish methanol oil pressure. After the self-check is completed, the vehicle starts and runs in methanol mode. This allows for delayed starting under temperature conditions where methanol atomization is poor, without affecting drivability and power, while increasing the probability of using methanol mode, reducing the running time in gasoline mode, and reducing fuel consumption and emissions.

[0072] Furthermore, in the second embodiment of the methanol engine mode control method of this application, referring to Figure 5 The method includes:

[0073] Step S11: If the vehicle speed value is greater than a preset vehicle speed threshold, or the duration of the vehicle speed value being zero is greater than a preset duration, then it is determined that the vehicle speed value meets the preset start-up condition.

[0074] The preset speed threshold can be used as a basis for judging the vehicle status. When the speed value is not zero, if the speed value is greater than the preset speed threshold, it means that the vehicle is currently traveling at a high speed. When switching from pure electric mode or other power modes to methanol engine operation mode, even if there is a start-up delay, the user's perception of the start-up speed is weak during driving, so it can be determined that the speed value meets the preset start-up conditions.

[0075] When the vehicle speed is zero, the vehicle starts from a standstill. In addition, the duration of the zero speed is longer than the preset time, which means that the vehicle stays stationary for a relatively long time. In this scenario, the user's perception of the starting speed is also weak. The delayed start has little impact on the vehicle's drivability and power. It can be determined that the vehicle speed meets the preset starting conditions.

[0076] Step S12: If the vehicle speed value is less than or equal to the preset vehicle speed threshold, or the duration of the vehicle speed value being zero is less than or equal to the preset duration, then it is determined that the vehicle speed value does not meet the preset start-up condition.

[0077] If the vehicle speed value is not zero, but is less than or equal to the preset vehicle speed threshold, it indicates that the vehicle's current driving speed is low. When switching from pure electric mode or other power modes to methanol engine operation mode, the user's perception of the starting speed is more obvious during driving, and it can be determined that the vehicle speed value does not meet the preset starting conditions.

[0078] If the duration of the vehicle speed being zero is less than or equal to the preset duration, the user may only be driving the vehicle for a short time and has a high need to restart the vehicle, that is, a high requirement for the vehicle's starting speed and does not want a delayed start. It can be determined that the vehicle speed does not meet the preset starting conditions.

[0079] The preset vehicle speed threshold can be set to 15 km / h, and the preset duration can be set to 10 seconds. By determining whether the vehicle speed meets the preset starting conditions under these conditions, the probability of starting the methanol mode can be reasonably increased by comprehensively considering user needs in scenarios requiring the methanol engine to be started, thus improving adaptability to user demands.

[0080] In some feasible implementations, after the step of determining that the vehicle speed value does not meet the preset start condition if the vehicle speed value is less than or equal to the preset vehicle speed threshold, or the duration of the vehicle speed value being zero is less than or equal to the preset duration, the method may further include:

[0081] Step S13: Obtain the second start command, and detect whether the methanol engine has a gasoline mode start record within a preset time period according to the second start command;

[0082] The second start command can be seen as an instruction to use a higher temperature value as the basis for selecting the start mode. When the vehicle speed does not meet the preset start conditions, the user will clearly perceive the start speed, and the methanol pump will not reduce the start speed by establishing methanol oil pressure through self-check.

[0083] Gasoline mode start-up record refers to the record of the start-up mode after the methanol engine is started in gasoline mode. The EMS can generate and store this record after controlling the methanol engine to start in gasoline mode, providing a basis for subsequent record retrieval. Gasoline has a shelf life of 15 to 90 days. If, during prolonged periods of high summer temperatures, the gasoline mode is not used for a month or even longer, the gasoline injectors are easily clogged by gum-like substances produced by the oxidation of residual gasoline, affecting the normal operation of the engine and potentially causing engine damage.

[0084] Step S14: If no gasoline mode start-up record is detected in the methanol engine within a preset time period, the methanol engine is controlled to start and run in gasoline mode.

[0085] The preset time period can be set according to the characteristics of gasoline. For example, if the preset time period is set to 10 days, and no gasoline mode start-up record is detected in the methanol engine within 10 days, it means that the vehicle has not used gasoline mode within 10 days. This allows the methanol engine to be controlled to start and run in gasoline mode, preventing the gasoline injectors from becoming clogged.

[0086] In some feasible implementations, after obtaining the second start command and detecting whether the methanol engine has a gasoline mode start record within a preset time period based on the second start command, the method may further include:

[0087] Step S15: If a gasoline mode start-up record is detected within a preset time period of the methanol engine, then the second water temperature value of the methanol engine is obtained.

[0088] If a gasoline mode start-up record is detected within a preset time period for the methanol engine, it indicates a low probability of gasoline injector clogging. The decision to start in methanol mode can be made by combining this information with the methanol engine coolant temperature reading. The second coolant temperature reading can be obtained by measuring the engine coolant temperature after detecting a gasoline mode start-up record within the preset time period.

[0089] Step S16: If the second water temperature value is greater than or equal to the preset temperature threshold, then control the methanol engine to start and run in methanol mode.

[0090] The second start command can include information about a preset temperature threshold, which is compared with the preset temperature threshold after the second coolant temperature value is obtained. If the vehicle speed does not meet the preset start conditions, the preset temperature threshold can be set higher, ensuring high start-up performance in both methanol and gasoline modes to meet user requirements for high start-up speed. If the second coolant temperature value is greater than or equal to the preset temperature threshold, the methanol atomization performance is good, allowing the methanol engine to start and operate in methanol mode.

[0091] Step S17: If the second water temperature value is less than the preset temperature threshold, then control the methanol engine to start and run in gasoline mode, wherein the preset temperature threshold is the same as the upper limit of the preset temperature range.

[0092] When the second water temperature is lower than the preset temperature threshold, the atomization performance of methanol is poor, and the methanol engine can be controlled to start and run in gasoline mode. The preset temperature threshold can be set to the same as the upper limit of the preset temperature range, for example, as described in the first embodiment above, it is set to 50°C. The preset temperature threshold and the upper limit of the preset temperature range are the same, that is, a uniform methanol mode start-up temperature standard is used.

[0093] In this embodiment, the relationship between the vehicle speed value and the preset vehicle speed threshold is used to determine whether the preset starting conditions are met. This serves as the basis for obtaining different starting commands, determining the user's requirements for starting speed, and avoiding the problem of gasoline injector clogging while meeting user needs, thus maintaining vehicle safety.

[0094] Furthermore, in the third embodiment of the methanol engine mode control method of this application, referring to Figure 6 The method includes:

[0095] Step S21: Detect whether the methanol engine has a gasoline mode start-up record within a preset time period;

[0096] The gasoline mode start-up record refers to the record of the start-up mode after the methanol engine starts in gasoline mode. The EMS can generate and store this record after controlling the methanol engine to start in gasoline mode, providing a basis for subsequent record queries. After receiving the first start command, it can also detect whether the methanol engine has started in gasoline mode within a preset time period according to the indication of the first start command, avoiding the problem of gasoline injector clogging. In this embodiment, the preset time period setting can be the same as that in the second embodiment above.

[0097] Step S22: If a gasoline mode start record is detected within a preset time period, then the step of detecting the first water temperature value of the methanol engine according to the first start command is executed.

[0098] If a gasoline mode start record exists within a preset time period, it indicates that the engine was started in gasoline mode within that period, making the likelihood of gasoline injector clogging relatively low. The starting method can be determined by executing a step that detects the first coolant temperature of the methanol engine based on the first start command, and then combining this result with the determination of the first coolant temperature. By comprehensively considering both the gasoline mode start record and the first coolant temperature value, the starting probability of methanol mode can be maximized while ensuring its starting performance.

[0099] Step S23: If no gasoline mode start-up record is detected in the methanol engine within a preset time period, the methanol engine is controlled to start and run in gasoline mode.

[0100] If no gasoline mode start record is detected within the preset time period, it means that the engine has not been started in gasoline mode within the preset time period. Continuing not to use gasoline mode may cause gasoline injector blockage. Therefore, the methanol engine can be controlled to start and run in gasoline mode to avoid the above problems.

[0101] In some feasible implementations, after the step of obtaining a first start command if the vehicle speed value meets the preset start condition, and detecting a first water temperature value of the methanol engine according to the first start command, the method may further include:

[0102] Step S24: If the first water temperature value is greater than the upper limit of the preset temperature range, then control the methanol engine to start and run in methanol mode.

[0103] When the first water temperature is greater than the upper limit of the preset temperature range, the atomization performance of methanol is good. Even if the methanol pump does not establish methanol oil pressure in advance through self-test, it can start normally. Therefore, it can be started and operated in methanol mode under this condition.

[0104] Step S25: If the first water temperature value is less than the lower limit of the preset temperature range, then control the methanol engine to start and run in gasoline mode.

[0105] When the initial water temperature is lower than the lower limit of the preset temperature range, methanol is difficult to ignite or even cannot be ignited. Therefore, the methanol engine can be controlled to start and run in gasoline mode, and then switch to methanol mode after the engine has warmed up to meet certain conditions.

[0106] In this embodiment, the specific starting mode of the methanol engine is determined by combining the gasoline mode start-up record and the first water temperature value, which avoids the problem of gasoline injector clogging and improves vehicle safety. Furthermore, by establishing methanol oil pressure in advance, the lower limit of the preset temperature range is extended, thus expanding the temperature range for methanol mode start-up and operation and improving the starting stability of the methanol engine.

[0107] Furthermore, in the fourth embodiment of the methanol engine mode control method of this application, referring to Figure 7 The method includes:

[0108] Step S40: Detect the starting water temperature value of the methanol engine, and obtain a preset switching water temperature threshold and a preset running time threshold associated with the starting water temperature value;

[0109] When a methanol engine is started in gasoline mode, to reduce emissions, it can be switched from gasoline mode to methanol mode later when switching conditions are met. The preset operating time threshold can be considered the required duration of operation in gasoline mode, and the preset switching coolant temperature threshold can be considered the required engine coolant temperature after warming up in gasoline mode. The starting coolant temperature value refers to the coolant temperature at which the methanol engine starts. There is a correlation between the starting coolant temperature value and the preset operating time threshold and preset switching coolant temperature threshold; therefore, these thresholds can be obtained by querying the starting coolant temperature value.

[0110] The preset switching coolant temperature threshold and preset running time threshold can be obtained by looking up a table. The vehicle can pre-store a mode switching mapping table obtained from EMS calibration of the methanol engine. This table includes the mapping relationship between the starting coolant temperature value, the minimum running time in gasoline mode required to switch to methanol mode, and the minimum switching temperature reached by the methanol engine. The minimum switching temperature in the mode switching mapping table can be used as the preset switching coolant temperature threshold, and the minimum running time as the preset running time threshold. Table 1 below shows an exemplary mode switching mapping table.

[0111] Table 1

[0112]

[0113] As shown in Table 1, when the starting water temperature matches the temperature values ​​listed in the table, the minimum operating time and minimum switching temperature obtained from the table can also be determined. When the starting water temperature falls within the temperature range listed in the table, the minimum operating time and minimum switching temperature obtained from the table can match the case where the temperature value is higher. For example, when the starting water temperature is 10℃, the minimum operating time is 32s and the minimum switching temperature is 30℃; when the starting water temperature is 25℃, the minimum operating time is 25s and the minimum switching temperature is 40℃.

[0114] Step S50: Obtain the operating water temperature value of the methanol engine in gasoline mode. If the operating water temperature value is greater than the preset switching water temperature threshold and the operating time in gasoline mode is greater than the preset operating time threshold, then control the methanol engine to switch from gasoline mode to methanol mode.

[0115] When the operating coolant temperature exceeds the preset switching temperature threshold, it indicates that the engine has warmed up to a certain extent. If this temperature is maintained for a duration exceeding the operating time threshold, the engine can switch from gasoline mode to methanol mode, using methanol fuel to power the system and reduce fuel consumption and emissions. If the operating coolant temperature is below the preset switching temperature threshold, or if the gasoline mode operating time is less than the preset operating time threshold, the engine can continue operating in gasoline mode until it warms up to the required conditions.

[0116] In this embodiment, the mode switching condition is related to the start-up water temperature value, rather than using a fixed minimum running time and minimum switching water temperature. Under the condition that the hot-engine conditions of the methanol engine are met, shortening the minimum running time in gasoline mode can further reduce fuel consumption and emissions.

[0117] Furthermore, in the fifth embodiment of the methanol engine mode control method of this application, referring to Figure 8 First, the VCU can determine that the methanol engine needs to be started. Then, the VCU determines that the vehicle speed is not greater than the preset vehicle speed threshold v and the vehicle speed is 0 for a duration not longer than the preset duration t1. If so, the VCU sends start command 1 (the second start command in the above embodiment) to the EMS. Otherwise, the VCU sends start command 2 (the first start command in the above embodiment) to the EMS.

[0118] After the vehicle controller (VCU) sends start command 1 or start command 2, if the engine controller (EMS) determines that the engine has not used gasoline mode within D days (the preset time period in the above embodiment), the EMS controls the methanol engine to start in gasoline mode and records the start-up coolant temperature value T1. After starting, if the engine coolant temperature is higher than the preset switching coolant temperature threshold T2 obtained by looking up the start-up coolant temperature value T1, and the gasoline mode running time is higher than the preset running time threshold t2 obtained by looking up T1, the EMS controls the engine to switch to methanol mode. Otherwise, the EMS controls the engine to continue running in gasoline mode.

[0119] After the vehicle controller sends start command 1, if the EMS determines that the engine has used gasoline mode within D days and the engine coolant temperature is higher than the upper limit T00 of the preset temperature range, then the EMS controls the engine to start running in methanol mode.

[0120] After the vehicle controller sends start command 1, if the EMS determines that the engine has used gasoline mode within D days and the engine coolant temperature is not higher than the upper limit of the preset temperature range T00, then the EMS controls the methanol engine to start in gasoline mode and records the start coolant temperature value T1. After starting, if the engine coolant temperature is higher than T2 obtained by looking up T1, and the gasoline mode running time is higher than t2 obtained by looking up T1, then the EMS controls the engine to switch to methanol mode. Otherwise, the EMS controls the engine to continue running in gasoline mode.

[0121] After the vehicle controller sends start command 2, if the EMS determines that the engine has used gasoline mode within D days and the engine coolant temperature is not higher than the lower limit T01 of the preset temperature range, then the EMS controls the methanol engine to start in gasoline mode and records the coolant temperature T1 at the start time. After starting, if the engine coolant temperature is higher than T2 obtained by looking up T1, and the gasoline mode running time is higher than t2 obtained by looking up T1, then the EMS controls the engine to switch to methanol mode. Otherwise, the EMS controls the engine to continue running in gasoline mode.

[0122] After the vehicle controller sends start command 2, if the EMS determines that the engine has used gasoline mode within D days and the engine coolant temperature is higher than the lower limit T01 of the preset temperature range but lower than the upper limit T00 of the preset temperature range, the EMS controls the methanol pump relay to engage for self-test. If the EMS determines that the methanol pump self-test time is higher than the preset engagement time t3, it controls the engine to start running in methanol mode.

[0123] After the vehicle controller sends start command 2, if the EMS determines that the engine has used gasoline mode within D days and the engine coolant temperature is higher than the upper limit T00 of the preset temperature range, then the EMS controls the methanol engine to start running in methanol mode.

[0124] For example, the preset vehicle speed threshold v = 15 km / h, the preset duration of the vehicle speed being 0 t1 = 10 s, the preset time period D = 10 days, the methanol engine obtains the preset temperature range for the shutdown start mode selection through EMS calibration, the upper limit T00 = 50℃, the lower limit T01 = 25℃, the preset duration of the methanol pump self-check time t3 = 1.5 s, the minimum gasoline start-up time t2 corresponding to the start-up water temperature value T1, and the minimum engine water temperature T2 for switching to methanol mode, the mapping relationship table of T1, T2 and t2 is shown in Table 1 above.

[0125] In this embodiment, firstly, a preset temperature range consisting of T00 and T01 is set. When the vehicle speed meets the conditions, a lower threshold T01 is used to further reduce the probability of starting in gasoline mode; otherwise, a higher threshold T00 is used. Secondly, a strategy for judging the time during which the engine has not used gasoline mode is added. If it exceeds D days of a preset time period, the engine is controlled to start in gasoline mode, avoiding gasoline injector problems caused by methanol vehicles not using gasoline mode for a long time in the continuous high temperature weather of summer. Finally, a new starting mode is proposed. When the methanol engine needs to be started, if the vehicle speed is higher than the threshold v or the vehicle speed is 0 for a duration higher than the threshold t1 (at this time, it is judged that the delayed engine start has no impact on drivability and power), and the engine has been started and run in gasoline mode within D days, if the engine coolant temperature is between the thresholds T00 and T01, the engine controller EMS controls the methanol pump relay to engage and perform a self-test to establish methanol oil pressure. After the self-test time exceeds the threshold t3, the methanol engine is controlled to start in methanol mode. By establishing methanol oil pressure in advance, the problem of poor methanol starting performance between engine coolant temperatures T01 and T00 is avoided.

[0126] This application also provides an electronic device, comprising: a memory, a processor, and a methanol engine mode control program stored in the memory and executable on the processor. The methanol engine mode control program is configured to implement the steps of the methanol engine mode control method described above. Specific implementation details of the electronic device in this application can be found in the various embodiments of the methanol engine control method described above, and will not be repeated here.

[0127] This application also provides a computer-readable storage medium storing a methanol engine mode control program. When executed by a processor, the methanol engine mode control program implements the steps of the methanol engine mode control method described above. Specific implementation details of the storage medium in this application are found in the aforementioned embodiments of the methanol engine control method and will not be repeated here.

[0128] 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.

[0129] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0130] 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 this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0131] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A methanol engine mode control method, characterized in that, The methanol engine mode control method includes the following steps: Obtain the vehicle speed value of the vehicle where the methanol engine is located, and determine whether the vehicle speed value meets the preset starting conditions; If the vehicle speed value meets the preset starting conditions, a first starting command is obtained, and the first water temperature value of the methanol engine is detected according to the first starting command; If the first water temperature value is within the preset temperature range, the methanol pump connected to the methanol engine is controlled to perform a self-test. After the self-test is completed, the methanol engine is controlled to start and run in methanol mode.

2. The methanol engine mode control method as described in claim 1, characterized in that, The step of determining whether the vehicle speed value meets the preset starting conditions includes: If the vehicle speed value is greater than a preset vehicle speed threshold, or the duration of the vehicle speed value being zero is greater than a preset duration, then the vehicle speed value is determined to meet the preset start-up condition. If the vehicle speed value is less than or equal to the preset vehicle speed threshold, or the duration of the vehicle speed value being zero is less than or equal to the preset duration, then it is determined that the vehicle speed value does not meet the preset start condition.

3. The methanol engine mode control method as described in claim 2, characterized in that, After the step of determining that the vehicle speed value does not meet the preset starting condition if the vehicle speed value is less than or equal to the preset vehicle speed value, or the duration of the vehicle speed value being zero is less than or equal to the preset duration, the method further includes: Obtain a second start command, and detect whether the methanol engine has a gasoline mode start record within a preset time period based on the second start command; If no gasoline mode start-up record is detected in the methanol engine within a preset time period, the methanol engine is controlled to start and run in gasoline mode.

4. The methanol engine mode control method as described in claim 3, characterized in that, After the steps of obtaining the second start command and detecting whether the methanol engine has a gasoline mode start record within a preset time period based on the second start command, the method further includes: If a gasoline mode start-up record is detected within a preset time period, the second water temperature value of the methanol engine is obtained. If the second water temperature value is greater than or equal to the preset temperature threshold, the methanol engine is controlled to start and run in methanol mode. If the second water temperature value is less than the preset temperature threshold, the methanol engine is controlled to start and run in gasoline mode, wherein the preset temperature threshold is the same as the upper limit of the preset temperature range.

5. The methanol engine mode control method as described in claim 1, characterized in that, Prior to the step of detecting the first water temperature value of the methanol engine according to the first start command, the method further includes: The system detects whether the methanol engine has a gasoline mode start-up record within a preset time period. If a gasoline mode start record is detected within a preset time period, then the step of detecting the first water temperature value of the methanol engine according to the first start command is executed. If no gasoline mode start-up record is detected in the methanol engine within a preset time period, the methanol engine is controlled to start and run in gasoline mode.

6. The methanol engine mode control method as described in claim 1, characterized in that, After the steps of obtaining a first start command if the vehicle speed value meets the preset start condition, and detecting a first water temperature value of the methanol engine according to the first start command, the method further includes: If the first water temperature value is greater than the upper limit of the preset temperature range, then the methanol engine is controlled to start and run in methanol mode. If the first water temperature value is less than the lower limit of the preset temperature range, the methanol engine is controlled to start and run in gasoline mode.

7. The methanol engine mode control method as described in claim 1, characterized in that, The step of controlling the methanol pump connected to the methanol engine to perform a self-test, and controlling the methanol engine to start running in methanol mode after the self-test is completed includes: Controls the activation of the relay connected to the methanol pump; If the relay's engagement time exceeds the preset engagement duration, the methanol engine is controlled to start and run in methanol mode.

8. The methanol engine mode control method according to any one of claims 3-6, characterized in that, After the step of controlling the methanol engine to start and operate in gasoline mode, the method further includes: The starting water temperature of the methanol engine is detected, and a preset switching water temperature threshold and a preset running time threshold associated with the starting water temperature are obtained. The operating water temperature value of the methanol engine in gasoline mode is obtained. If the operating water temperature value is greater than the preset switching water temperature threshold and the operating time in gasoline mode is greater than the preset operating time threshold, the methanol engine is controlled to switch from gasoline mode to methanol mode.

9. An electronic device, characterized in that, The electronic device includes: a memory, a processor, and a methanol engine mode control program stored in the memory and executable on the processor, the methanol engine mode control program being configured to implement the steps of the methanol engine mode control method as described in any one of claims 1 to 8.

10. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and the computer-readable storage medium stores a methanol engine mode control program. When the methanol engine mode control program is executed by a processor, it implements the steps of the methanol engine mode control method as described in any one of claims 1 to 8.

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