Method and device for heating fuel of dual-fuel engine

Abstract

The present application provides a method and device for heating the fuel of a dual-fuel engine, which are applied to a dual-fuel engine. The engine includes a heater disposed on the outer surface of a methanol injector and a solenoid valve disposed at the engine water outlet. The solenoid valve is connected to the coolant inlet of the heater. The method includes: detecting whether the control parameters of the engine meet the preset opening conditions; the opening conditions include that the operating mode is a dual-fuel mode, the ambient temperature is lower than a preset first temperature threshold, and the coolant temperature is higher than a preset second temperature threshold; if the control parameters meet the opening conditions, controlling the solenoid valve to open, so that the coolant at the engine water outlet flows into the heater to heat the methanol fuel in the methanol injector. This solution can utilize the high-temperature coolant at the engine water outlet to heat the methanol fuel to be injected when the methanol temperature is low and the coolant temperature is high, thereby improving the atomization effect of the methanol fuel injected into the cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of dual-fuel engines, and particularly to a method and device for heating the fuel of a dual-fuel engine. Background Art

[0002] A dual-fuel engine generally refers to a methanol-diesel engine. When such an engine operates, methanol and diesel can be simultaneously injected into the cylinder, enabling the two fuels to be mixed and burned in the cylinder, achieving the effects of improving the combustion efficiency of the engine and reducing environmental pollution.

[0003] However, methanol has a relatively high latent heat of vaporization, and the methanol injected into the cylinder is prone to poor atomization problems, which can further cause engine misfires or incomplete combustion. Summary of the Invention

[0004] In view of the above-mentioned drawbacks of the prior art, the present invention provides a method and device for heating the fuel of a dual-fuel engine to improve the atomization effect of methanol in the dual-fuel engine.

[0005] A first aspect of the present application provides a method for heating the fuel of a dual-fuel engine, which is applied to a dual-fuel engine. The engine includes a heater disposed on the outer surface of a methanol injector and a solenoid valve disposed at the engine water outlet. The solenoid valve is connected to the coolant inlet of the heater.

[0006] The method includes:

[0007] Detecting whether the control parameters of the engine meet the preset opening conditions; wherein, the control parameters include the operating mode of the engine, the ambient temperature, and the coolant temperature at the engine water outlet, and the opening conditions include that the operating mode is a dual-fuel mode, the ambient temperature is lower than a preset first temperature threshold, and the coolant temperature is higher than a preset second temperature threshold;

[0008] If the control parameters meet the opening conditions, controlling the solenoid valve to open, so that the coolant at the engine water outlet flows into the heater to heat the methanol fuel in the methanol injector.

[0009] Optionally, the controlling the solenoid valve to open includes:

[0010] Determining a target opening degree according to the ambient temperature and the coolant temperature;

[0011] Controlling the solenoid valve to open to the target opening degree.

[0012] Optionally, after detecting whether the control parameters of the engine meet the preset opening conditions, it further includes:

[0013] If the control parameter does not meet the opening condition, detect whether the control parameter meets a preset heating condition;

[0014] If the control parameter meets the heating condition, control the solenoid valve to open and control the first resistance wire in the heater to be energized to heat the coolant flowing into the heater; wherein, the heating condition includes that the operation mode is a dual-fuel mode, the ambient temperature is lower than the first temperature threshold and the coolant temperature is not higher than the second temperature threshold;

[0015] Wherein, when the control parameter does not meet the heating condition, the solenoid valve is in a closed state.

[0016] Optionally, after detecting whether the control parameter of the engine meets a preset opening condition, it further includes:

[0017] If the control parameter meets the opening condition, output a prompt message; wherein, the prompt message is used to indicate that the temperature of the methanol fuel is too low.

[0018] Optionally, after detecting whether the control parameter of the engine meets a preset opening condition, it further includes:

[0019] If the control parameter meets the opening condition, control the second resistance wire in the methanol injector to be energized to heat the methanol fuel flowing into the methanol injector.

[0020] The second aspect of the present application provides a device for heating fuel of a dual-fuel engine, which is applied to a dual-fuel engine. The engine includes a heater arranged on the outer surface of the methanol injector and a solenoid valve arranged at the engine water outlet, and the coolant inlet of the solenoid valve is connected to the heater;

[0021] The device includes:

[0022] A detection unit, configured to detect whether the control parameter of the engine meets a preset opening condition; wherein, the control parameter includes the operation mode of the engine, the ambient temperature and the coolant temperature at the engine water outlet, and the opening condition includes that the operation mode is a dual-fuel mode, the ambient temperature is lower than the first temperature threshold and the coolant temperature is higher than the second temperature threshold;

[0023] A control unit, configured to:

[0024] If the control parameter meets the opening condition, control the solenoid valve to open, so that the coolant at the engine water outlet flows into the heater to heat the methanol fuel in the methanol injector.

[0025] Optionally, when the control unit controls the solenoid valve to open, it is specifically configured to:

[0026] Determine a target opening degree according to the ambient temperature and the coolant temperature;

[0027] Control the solenoid valve to open to the target opening degree.

[0028] Optionally, the control unit is further configured to:

[0029] If the control parameter does not meet the opening condition, detect whether the control parameter meets a preset heating condition;

[0030] If the control parameter meets the heating condition, control the solenoid valve to open and control the first resistance wire in the heater to be energized to heat the coolant flowing into the heater; wherein, the heating condition includes that the operation mode is a dual-fuel mode, the ambient temperature is lower than the first temperature threshold, and the coolant temperature is not higher than the second temperature threshold;

[0031] Wherein, when the control parameter does not meet the heating condition, the solenoid valve is in a closed state.

[0032] Optionally, the device further includes an output unit, configured to:

[0033] If the control parameter meets the opening condition, output a prompt message; wherein, the prompt message is used to indicate that the temperature of the methanol fuel is too low.

[0034] Optionally, the control unit is further configured to:

[0035] If the control parameter meets the opening condition, control the second resistance wire in the methanol injector to be energized to heat the methanol fuel flowing into the methanol injector.

[0036] The present application provides a method and a device for heating fuel of a dual-fuel engine, which are applied to a dual-fuel engine. The engine includes a heater arranged on the outer surface of the methanol injector and a solenoid valve arranged at the engine water outlet. The coolant inlets of the solenoid valve and the heater are connected; the method includes: detecting whether the control parameter of the engine meets a preset opening condition; wherein, the control parameter includes the operation mode of the engine, the ambient temperature, and the coolant temperature at the engine water outlet, and the opening condition includes that the operation mode is a dual-fuel mode, the ambient temperature is lower than a preset first temperature threshold, and the coolant temperature is higher than a preset second temperature threshold; if the control parameter meets the opening condition, control the solenoid valve to open, so that the coolant at the engine water outlet flows into the heater to heat the methanol fuel in the methanol injector. This solution can utilize the high-temperature coolant at the engine water outlet to heat the methanol fuel to be injected when the methanol temperature is low and the coolant temperature is high, thereby improving the atomization effect of the methanol fuel injected into the cylinder. Description of the Drawings

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0038] Figure 1 It is a schematic structural diagram of an existing dual-fuel engine;

[0039] Figure 2 It is a schematic structural diagram of a dual-fuel engine provided by an embodiment of the present application;

[0040] Figure 3 It is a flowchart of a method for heating the fuel of a dual-fuel engine provided by an embodiment of the present application;

[0041] Figure 4 It is a flowchart of another method for heating the fuel of a dual-fuel engine provided by an embodiment of the present application;

[0042] Figure 5 It is a schematic diagram of a device for heating the fuel of a dual-fuel engine provided by an embodiment of the present application. Detailed implementation manners

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0044] Methanol is a liquid at normal temperature and pressure, with a single chemical composition, no sulfides, good anti-knock performance, an oxygen content as high as 50%, only one C atom in the molecule, and no C-C bond. It is an ideal vehicle fuel. The cetane number of methanol is only 3, and its auto-ignition temperature is as high as 500 °C. Direct application of methanol fuel in a compression-ignition engine requires a compression ratio as high as 25, and direct compression ignition is almost impossible. The most mature application of methanol in a compression-ignition engine is the diesel / methanol dual-fuel combustion method proposed by Tianjin University. Dual combustion adopts a fuel supply mode of low-pressure injection of methanol fuel into the intake port and direct injection of diesel into the cylinder. The uniform methanol-air mixture is ignited by the direct injection of diesel in the cylinder. With the high vaporization latent heat, low theoretical air-fuel ratio, high oxygen content, and high H / C ratio of methanol, it is beneficial to improve the combustion efficiency of the engine, reduce smoke and NOx emissions at the same time, and achieve efficient and clean combustion.

[0045] To facilitate the understanding of the technical solutions of the present application, first in combination with Figure 1The structural schematic diagram of the dual-fuel engine shown illustrates the working principle of the dual-fuel engine.

[0046] As Figure 1 shown, a methanol injector 101 is provided at the intake pipe of the dual-fuel engine. When the engine is operating, the methanol injector can inject methanol fuel into the air in the intake pipe 102 to form a methanol-air mixture in the intake pipe. Then, the methanol-air mixture enters the cylinder, and the diesel injector 103 on one side of the cylinder injects diesel into the cylinder. Finally, methanol, diesel, and air are mixed and burned in the cylinder. The exhaust gas after combustion is discharged through the exhaust pipe 104.

[0047] Among them, both the diesel injector and the methanol injector are controlled by an electronic control unit 105 (Electronic Control Unit, ECU) connected to the engine.

[0048] Although the diesel / methanol dual-fuel engine has higher thermal efficiency and lower emission levels than a diesel engine, due to the physical and chemical properties of methanol fuel, the diesel / methanol dual-fuel engine has poor combustion performance during starting and at low loads, and there is a risk of misfire in the cylinder. Therefore, the diesel / methanol dual-fuel engine operates in a pure diesel working mode during starting and at low loads, and switches to a diesel / methanol dual-fuel working mode after the engine is fully warmed up, and adjusts the injection ratio of methanol according to different working conditions.

[0049] The latent heat of vaporization of methanol is 3-4 times that of gasoline and diesel. The high latent heat of vaporization will cause methanol fuel to absorb more heat during the evaporation process in the intake manifold, reducing the average temperature of the intake manifold and the cylinder. The resulting cooling effect will prevent the fuel from being completely vaporized, making it difficult to form a combustible mixture. In addition, the addition of methanol will delay the ignition time of diesel and increase the ignition delay period, which is not conducive to the engine working at low speed and low load, and the engine performance deteriorates.

[0050] To solve the problem of poor atomization caused by the large latent heat of vaporization of methanol fuel, the present invention proposes a solution to heat the methanol fuel in the dual-fuel engine.

[0051] To implement the solution of the present invention, it is first necessary to improve the structure of the existing dual-fuel engine.

[0052] As Figure 2 shown, it is the structural schematic diagram of the improved dual-fuel engine provided by the embodiment of the present application.

[0053] As Figure 2As shown in the figure, a heater 202 is provided on the outer surface of the methanol injector 201. The heater includes a coolant inlet 220 and a coolant outlet 221. The coolant inlet 220 is connected to the engine water outlet 203, and a solenoid valve 204 is provided at the connection. The solenoid valve is connected to an electronic control unit (i.e., ECU) 205 and is controlled by the ECU.

[0054] The coolant outlet 221 is connected to the water pump inlet 206 of the engine.

[0055] When the engine is running, the ECU can control the solenoid valve to open according to a certain control logic. After the solenoid valve opens, the high-temperature coolant that has flowed through the engine and absorbed the heat generated during engine operation will enter the heater through the coolant inlet, thereby transferring the heat to the methanol fuel in the methanol injector that is in contact with the heater. Thus, the methanol fuel 207 to be injected is heated, and the heated methanol fuel is ejected from the methanol nozzle 208. Subsequently, the coolant flows out from the coolant outlet and returns to the original coolant circulation system through the water pump inlet.

[0056] Through the above improvements, the temperature of the methanol fuel to be injected in the methanol injector can be increased, and the problem of insufficient atomization of the methanol fuel is improved.

[0057] The coolant can be water or other liquids used to cool the engine.

[0058] According to Figure 2 the structure of the dual-fuel engine shown, an embodiment of the present application provides a method for heating the fuel of a dual-fuel engine, which is applied to a dual-fuel engine. The engine includes a heater provided on the outer surface of the methanol injector, a solenoid valve provided at the engine water outlet, and the solenoid valve is connected to the coolant inlet of the heater.

[0059] Please refer to Figure 3 , which is a flowchart of the method. The method may include the following steps.

[0060] The method provided by any embodiment of the present application can be executed by Figure 2 the electronic control unit shown.

[0061] S301, Detect whether the control parameters of the engine meet the preset opening conditions.

[0062] Among them, the control parameters include the operating mode of the engine, the ambient temperature, and the coolant temperature at the engine water outlet. The opening conditions include that the operating mode is the dual-fuel mode, the ambient temperature is lower than a preset first temperature threshold, and the coolant temperature is higher than a preset second temperature threshold.

[0063] The dual-fuel mode refers to the operating mode in which the engine uses both methanol fuel and diesel fuel simultaneously. Some dual-fuel engines only use diesel combustion during the starting phase and low-speed phase. At this time, the operating mode of the engine belongs to the single-fuel mode. In this mode, since methanol is not injected, there is no need to turn on the solenoid valve to heat the methanol fuel in the methanol injector. Conversely, if in the dual-fuel mode, it may be necessary to heat the methanol fuel in the methanol injector.

[0064] The operating mode can be determined according to whether the methanol injector is working. If the methanol injector is not working, the operating mode is determined to be the single-fuel mode. If the methanol injector is working, the operating mode is determined to be the dual-fuel mode.

[0065] The first temperature threshold and the second temperature threshold can be specifically determined according to the actual scenario, and the specific values thereof are not limited in this embodiment.

[0066] Exemplarily, assuming that the evaporation and atomization effect of methanol fuel is poor when the ambient temperature is lower than 10°C and good when it is higher than 10°C, the first temperature threshold can be set at 10°C. That is to say, only when the evaporation and atomization effect of methanol fuel is poor, it is necessary to turn on the solenoid valve.

[0067] The second temperature threshold is set to prevent the coolant at too low a temperature from entering the heater and adversely affecting the atomization of methanol fuel. Exemplarily, the second temperature threshold can be set at 25°C. If the coolant temperature at the engine water outlet is not higher than 25°C, there is no need to turn on the solenoid valve.

[0068] The ambient temperature can be detected by using the temperature sensor provided on the fuel tank, and the coolant temperature can be detected by using the temperature sensor at the engine water outlet.

[0069] If the control parameter meets the opening condition, execute step S302. If the control parameter does not meet the opening condition, execute step S303.

[0070] That is to say, in this embodiment, the solenoid valve will only open when all three conditions are met: the operating mode is the dual-fuel mode, the ambient temperature is lower than the preset first temperature threshold, and the coolant temperature is higher than the preset second temperature threshold.

[0071] S302: Control the solenoid valve to open, so that the coolant at the engine water outlet flows into the heater to heat the methanol fuel in the methanol injector.

[0072] In some alternative embodiments, the ECU can directly open the solenoid valve to the maximum opening, or it can also be opened to a preset fixed opening, such as 70% of the maximum opening. The opening degree of the solenoid valve after opening is not limited in this embodiment.

[0073] In some other alternative embodiments, step S302, i.e., controlling the solenoid valve to open, may also include:

[0074] Determine the target opening degree according to the ambient temperature and the coolant temperature;

[0075] Control the solenoid valve to open to the target opening degree.

[0076] Specifically, the temperature difference between the ambient temperature and the coolant temperature can be calculated, and the target opening degree can be determined according to the temperature difference. The larger the temperature difference, the better the heating effect of the coolant, and the less coolant needed for heating. Therefore, a smaller target opening degree can be set. On the contrary, the smaller the temperature difference, the larger the target opening degree can be set.

[0077] The beneficial effect of determining the target opening degree according to the ambient temperature and the coolant temperature is as follows:

[0078] On the one hand, by controlling the opening degree of the solenoid valve, the flow rate of the coolant entering the heater can be controlled, thereby controlling the temperature range of the methanol fuel after being heated, so that the temperature of the methanol fuel to be injected in the methanol injector is neither too high nor too low. On the other hand, it can avoid too much coolant entering the heater and resulting in insufficient coolant for cooling the engine.

[0079] Optionally, after detecting whether the control parameters of the engine meet the preset opening conditions, it further includes:

[0080] If the control parameters meet the opening conditions, output a prompt message; wherein, the prompt message is used to indicate that the temperature of the methanol fuel is too low.

[0081] The output mode of the above prompt message can be voice broadcast in the vehicle cab and display text information on the control panel in the vehicle cab.

[0082] The content of the output prompt message may include prompting that the temperature of the methanol fuel is too low and it is not suitable to use the dual-fuel mode.

[0083] Optionally, the above prompt message can also be output when the ambient temperature is lower than the first temperature threshold and the operating mode of the engine is the dual-fuel mode, regardless of whether the coolant temperature is higher than the second temperature threshold.

[0084] The beneficial effect of outputting the prompt message is to prompt the driver to control the engine to switch to the single-fuel mode and avoid the engine working in the dual-fuel mode when the temperature of the methanol fuel is too low.

[0085] Optionally, after detecting whether the control parameters of the engine meet the preset opening conditions, it further includes:

[0086] If the control parameter meets the opening condition, control the second resistance wire in the methanol injector to be energized to heat the methanol fuel flowing into the methanol injector.

[0087] The second resistance wire can be arranged in the pipeline through which the methanol fuel flows in the methanol injector.

[0088] By controlling the second resistance wire to be energized, the methanol fuel can be heated by both the second resistance wire and the relatively high-temperature coolant in the heater, obtaining a better heating effect.

[0089] S303, do not control the solenoid valve to open.

[0090] In step S303, if the solenoid valve is in the open state before executing S303, the ECU sends a closing instruction to the solenoid valve to control the solenoid valve to close. If the solenoid valve is already in the closed state before executing S303, the ECU does not send an instruction to the solenoid valve, and the solenoid valve remains in its original closed state. Therefore, not controlling the solenoid valve to open is equivalent to keeping the solenoid valve in the closed state when the corresponding conditions are not met.

[0091] This application provides a method and device for heating the fuel of a dual-fuel engine, which is applied to a dual-fuel engine. The engine includes a heater arranged on the outer surface of the methanol injector, a solenoid valve arranged at the engine water outlet, and the coolant inlet of the solenoid valve is connected to that of the heater. The method includes: detecting whether the control parameter of the engine meets the preset opening condition; wherein, the control parameter includes the operating mode of the engine, the ambient temperature, and the coolant temperature at the engine water outlet, and the opening condition includes that the operating mode is the dual-fuel mode, the ambient temperature is lower than the preset first temperature threshold, and the coolant temperature is higher than the preset second temperature threshold; if the control parameter meets the opening condition, control the solenoid valve to open, so that the coolant at the engine water outlet flows into the heater to heat the methanol fuel in the methanol injector. This solution can utilize the high-temperature coolant at the engine water outlet to heat the methanol fuel to be injected when the methanol temperature is low and the coolant temperature is high, thereby improving the atomization effect of the methanol fuel injected into the cylinder.

[0092] Please refer to Figure 4 , which is a flowchart of another method for heating the fuel of a dual-fuel engine provided by an embodiment of this application. The method may include the following steps.

[0093] S301. Detect whether the control parameter of the engine meets the preset opening condition.

[0094] Wherein, the control parameter includes the operating mode of the engine, the ambient temperature, and the coolant temperature at the engine water outlet, and the opening condition includes that the operating mode is the dual-fuel mode, the ambient temperature is lower than the preset first temperature threshold, and the coolant temperature is higher than the preset second temperature threshold.

[0095] If the control parameter meets the opening condition, execute step S302; if the control parameter does not meet the opening condition, execute step S403.

[0096] S302: Control the solenoid valve to open, so that the coolant at the engine water outlet flows into the heater to heat the methanol fuel in the methanol injector.

[0097] S403: Detect whether the control parameter meets the preset heating condition.

[0098] If the control parameter meets the heating condition, execute step S404; if the control parameter does not meet the heating condition, execute step S303.

[0099] Among them, the heating condition includes that the operation mode is the dual-fuel mode, the ambient temperature is lower than the first temperature threshold, and the coolant temperature is not higher than the second temperature threshold.

[0100] If the operation mode is the dual-fuel mode and the ambient temperature is lower than the first temperature threshold, it means that the methanol fuel in the methanol injector needs to be heated at this time. However, the coolant temperature is not higher than the second temperature threshold, that is, the coolant temperature is too low to be used for heating. At this time, other methods can be used to heat the coolant so that the coolant temperature at the engine water outlet is increased to be higher than the second temperature threshold.

[0101] S404: Control the solenoid valve to open and control the first resistance wire in the heater to be energized to heat the coolant flowing into the heater.

[0102] The first resistance wire can be arranged in the pipeline at the engine water outlet, and the surface of the first resistance wire is covered with an insulating coating.

[0103] S303: Do not control the solenoid valve to open.

[0104] The beneficial effect of this embodiment is as follows:

[0105] When it is necessary to heat the methanol fuel but the coolant temperature is too low to heat, the first resistance wire is used to heat the coolant, so that the temperature of the coolant is increased to be sufficient for heating the methanol fuel, thereby ensuring that the methanol fuel can be heated even when the coolant temperature at the engine water outlet is low.

[0106] According to the method for heating the fuel of a dual-fuel engine provided by the embodiments of the present application, the embodiments of the present application also provide a device for heating the fuel of a dual-fuel engine, which is applied to a dual-fuel engine. The engine includes a heater arranged on the outer surface of the methanol injector, a solenoid valve arranged at the engine water outlet, and the coolant inlet of the solenoid valve is connected to the coolant inlet of the heater.

[0107] Please refer to Figure 5 , which is a schematic structural diagram of the device. The device may include the following units.

[0108] The device provided in this embodiment can be regarded as Figure 2 the shown electronic control unit (ECU).

[0109] The detection unit 501 is used to detect whether the control parameters of the engine meet the preset opening conditions.

[0110] Among them, the control parameters include the operating mode of the engine, the ambient temperature, and the coolant temperature at the engine water outlet. The opening conditions include that the operating mode is the dual-fuel mode, the ambient temperature is lower than the first temperature threshold, and the coolant temperature is higher than the second temperature threshold;

[0111] The control unit 502 is used for:

[0112] If the control parameters meet the opening conditions, control the solenoid valve to open, so that the coolant at the engine water outlet flows into the heater to heat the methanol fuel in the methanol injector.

[0113] Optionally, when the control unit 502 controls the solenoid valve to open, it is specifically used for:

[0114] Determine the target opening according to the ambient temperature and the coolant temperature;

[0115] Control the solenoid valve to open to the target opening.

[0116] Optionally, the control unit 502 is further used for:

[0117] If the control parameters do not meet the opening conditions, detect whether the control parameters meet the preset heating conditions;

[0118] If the control parameters meet the heating conditions, control the solenoid valve to open and control the first resistance wire in the heater to be energized to heat the coolant flowing into the heater; among them, the heating conditions include that the operating mode is the dual-fuel mode, the ambient temperature is lower than the first temperature threshold, and the coolant temperature is not higher than the second temperature threshold;

[0119] If the control parameters do not meet the heating conditions, control the solenoid valve to close.

[0120] Optionally, the device further includes an output unit 503, which is used for:

[0121] If the control parameters meet the opening conditions, output a prompt message; among them, the prompt message is used to indicate that the temperature of the methanol fuel is too low.

[0122] Optionally, the control unit 502 is further used for:

[0123] If the control parameters meet the opening conditions, control the second resistance wire in the methanol injector to be energized to heat the methanol fuel flowing into the methanol injector.

[0124] For the working principle of the device for heating the fuel of a dual-fuel engine provided in this embodiment, reference can be made to the relevant steps in the method for heating the fuel of a dual-fuel engine provided in any embodiment of this application, which will not be elaborated herein.

[0125] This application provides a device for heating the fuel of a dual-fuel engine, which is applied to a dual-fuel engine. The engine includes a heater arranged on the outer surface of a methanol injector and a solenoid valve arranged at the engine water outlet. The solenoid valve is connected to the coolant inlet of the heater. The device includes: a detection unit 501 for detecting whether the control parameters of the engine meet the preset opening conditions; wherein, the control parameters include the operating mode of the engine, the ambient temperature, and the coolant temperature at the engine water outlet, and the opening conditions include that the operating mode is the dual-fuel mode, the ambient temperature is lower than a preset first temperature threshold, and the coolant temperature is higher than a preset second temperature threshold; a control unit 502, if the control parameters meet the opening conditions, controls the solenoid valve to open, so that the coolant at the engine water outlet flows into the heater to heat the methanol fuel in the methanol injector. This solution can utilize the high-temperature coolant at the engine water outlet to heat the methanol fuel to be injected when the methanol temperature is low and the coolant temperature is high, thereby improving the atomization effect of the methanol fuel injected into the cylinder.

[0126] Finally, it should also be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0127] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order of functions executed by these devices, modules or units or their interdependent relationships.

[0128] Those skilled in the art can implement or use this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for heating fuel of a dual-fuel engine, characterized in that, Applied to a dual-fuel engine, the engine includes a heater disposed on the outer surface of a methanol injector and a solenoid valve disposed at the engine water outlet, and the solenoid valve is connected to the coolant inlet of the heater; The method includes: Detecting whether the control parameters of the engine meet a preset opening condition; wherein, the control parameters include the operating mode of the engine, the ambient temperature, and the coolant temperature at the engine water outlet, and the opening condition includes that the operating mode is the dual-fuel mode, the ambient temperature is lower than a preset first temperature threshold, and the coolant temperature is higher than a preset second temperature threshold; If the control parameters meet the opening condition, controlling the solenoid valve to open, so that the coolant at the engine water outlet flows into the heater to heat the methanol fuel in the methanol injector; If the control parameters do not meet the opening condition, detecting whether the control parameters meet a preset heating condition; If the control parameters meet the heating condition, controlling the solenoid valve to open and controlling the first resistance wire in the heater to be energized to heat the coolant flowing into the heater; wherein, the heating condition includes that the operating mode is the dual-fuel mode, the ambient temperature is lower than the first temperature threshold, and the coolant temperature is not higher than the second temperature threshold; Wherein, when the control parameters do not meet the heating condition, the solenoid valve is in a closed state.

2. The method according to claim 1, characterized in that The controlling the solenoid valve to open includes: Determining a target opening degree according to the ambient temperature and the coolant temperature; Controlling the solenoid valve to open to the target opening degree.

3. The method according to claim 1, wherein After detecting whether the control parameters of the engine meet the preset opening condition, it further includes: If the control parameters meet the opening condition, outputting a prompt message; wherein, the prompt message is used to indicate that the temperature of the methanol fuel is too low.

4. The method according to claim 1, wherein After detecting whether the control parameters of the engine meet the preset opening condition, it further includes: If the control parameters meet the opening condition, controlling the second resistance wire in the methanol injector to be energized to heat the methanol fuel flowing into the methanol injector.

5. A device for heating the fuel of a dual-fuel engine, characterized in that, Applied to a dual-fuel engine, the engine includes a heater disposed on the outer surface of a methanol injector and a solenoid valve disposed at the engine water outlet, and the solenoid valve is connected to the coolant inlet of the heater; The device includes: A detection unit for detecting whether the control parameters of the engine meet a preset opening condition; wherein, the control parameters include the operating mode of the engine, the ambient temperature, and the coolant temperature at the engine water outlet, and the opening condition includes that the operating mode is the dual-fuel mode, the ambient temperature is lower than a first temperature threshold, and the coolant temperature is higher than a second temperature threshold; A control unit for: If the control parameters meet the opening condition, controlling the solenoid valve to open, so that the coolant at the engine water outlet flows into the heater to heat the methanol fuel in the methanol injector; The control unit is further used for: If the control parameters do not meet the opening condition, detecting whether the control parameters meet a preset heating condition; If the control parameter meets the heating condition, control the solenoid valve to open and control the first resistance wire in the heater to be energized to heat the coolant flowing into the heater; wherein, the heating condition includes that the operation mode is the dual-fuel mode, the ambient temperature is lower than the first temperature threshold, and the coolant temperature is not higher than the second temperature threshold. Wherein, when the control parameter does not meet the heating condition, the solenoid valve is in the closed state.

6. The device according to claim 5, wherein When the control unit controls the solenoid valve to open, it is specifically used for: Determine the target opening degree according to the ambient temperature and the coolant temperature. Control the solenoid valve to open to the target opening degree.

7. The device according to claim 5, characterized in that The device further includes an output unit for: If the control parameter meets the opening condition, output a prompt message; wherein, the prompt message is used to indicate that the temperature of the methanol fuel is too low.

8. The device according to claim 5, characterized in that, The control unit is further used for: If the control parameter meets the opening condition, control the second resistance wire in the methanol injector to be energized to heat the methanol fuel flowing into the methanol injector.

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