Dual-fuel engine spraying system and control method thereof

Abstract

The invention discloses a dual-fuel engine spraying system and a control method thereof, and the spraying system mainly utilizes a water pump control box to dynamically control an electric water pump, pressurizes water, sprays the pressurized water from a water spraying nozzle in a mist form, crossly mixes the pressurized water with tail gas exhausted by an engine in the middle or outside an engine exhaust pipe, dissolves harmful gases such as NOx, and finally realizes spraying of the water in the middle or outside of the engine exhaust pipe. The control method comprises the steps that when the engine is in a starting state, the spraying system is controlled to start spraying water, and when the engine operates in a dual-fuel mode, the water spraying amount of the spraying system is adjusted according to real-time operation parameters of the engine, namely the water spraying amount is dynamically adjusted according to real-time working conditions of the engine. Therefore, harmful gas, adsorbed soot and the like in the tail gas of the engine are quickly dissolved by utilizing the spraying system, so that the emission of the engine is reduced; the device has the advantages of being low in cost, small in installation space, convenient to maintain, high in universality, flexible in arrangement and rapid in installation.

Description

Technical Field

[0001] The present invention relates to the technical field of dual-fuel engines, and in particular to a dual-fuel engine spray system and a control method thereof. Background Art

[0002] The combustion of dual-fuel engines, such as methanol engines, will produce harmful gases and particulate matter such as NOx, causing environmental pollution. In order to reduce the emission indicators of methanol engines and meet the laws and regulations on emissions, the use of SCR (three-way catalytic reduction device) has become the choice of most engines in the prior art. The SCR device can effectively reduce engine emissions, but the SCR device contains a large amount of precious metals such as platinum, and the cost is relatively high. The SCR device is arranged in the middle of the exhaust pipe, which is large in size and weight, and inconvenient to install. At the same time, the SCR device also needs to be continuously sprayed with urea to improve its efficiency, which is troublesome to use and maintain, and the cost is relatively high. Summary of the invention

[0003] In view of the above-mentioned deficiencies, the technical problem to be solved by the present invention is: to provide a dual-fuel engine spray system and a control method thereof, which automatically controls the spray system to spray the middle or tail of the engine exhaust pipe, and dynamically adjusts the water spraying amount according to the real-time operating conditions of the engine, so as to effectively reduce engine emissions. The spray system has the advantages of low cost, small installation space, easy maintenance, strong versatility, flexible layout and quick installation.

[0004] In order to solve the above technical problems, the technical solution of the present invention is:

[0005] A control method for a dual-fuel engine spray system comprises the following steps:

[0006] S10, determining whether the engine is in a starting state;

[0007] S20: If the engine is in the starting state, obtain the current operating mode of the engine;

[0008] S30, determining whether the current operating mode is a dual fuel mode;

[0009] S40, if the current operation mode is the dual fuel mode, generating a corresponding water spray opening signal;

[0010] S50, controlling the sprinkler system to start spraying water according to the water spraying start signal;

[0011] S60, obtaining real-time operating parameters of the engine;

[0012] S70, generating a corresponding water volume adjustment signal according to the real-time operating parameters;

[0013] S80, adjusting the water spraying amount of the sprinkler system according to the water amount adjustment signal.

[0014] Preferably, the S40 includes: if the current operation mode is not the dual fuel mode, executing S90;

[0015] S90, obtaining current operating parameters of the engine;

[0016] Determine whether the current operating parameters have reached the preset threshold for starting water spraying;

[0017] If the current operating parameters reach the threshold for starting water spraying, a corresponding signal for starting water spraying is generated;

[0018] According to the signal to start water spraying, the sprinkler system is controlled to start water spraying.

[0019] Preferably, after the step of starting the sprinkler system to spray water according to the water spraying signal in S90, the following steps are further included:

[0020] Then obtain the current operating parameters of the engine;

[0021] Determine whether the current operating parameters have reached a preset threshold for stopping water spraying;

[0022] If the current operating parameters reach the water spray stop threshold, a corresponding water spray stop signal is generated;

[0023] According to the water spraying shut-off signal, the sprinkler system is controlled to stop spraying water.

[0024] Preferably, the S70 includes:

[0025] When the change state of the real-time operating parameter is increasing, the generated water volume adjustment signal is an increase signal;

[0026] When the change state of the real-time operating parameter is decreasing, the generated water volume adjustment signal is a decreasing signal;

[0027] The S80 includes:

[0028] According to the increase signal, the water spraying amount of the sprinkler system is increased;

[0029] According to the reduction signal, the water spraying amount of the sprinkler system is reduced.

[0030] Preferably, the spray system includes an electric water pump;

[0031] The S80 further includes:

[0032] According to the increase signal, the current frequency of the electric water pump is increased to increase the water spraying amount of the sprinkler system;

[0033] According to the reduction signal, the current frequency of the electric water pump is reduced to reduce the water spraying amount of the sprinkler system.

[0034] Preferably, the control method further comprises the following steps:

[0035] After the sprinkler system starts to spray water according to the water spraying signal, the pressure value in the main water pipe of the sprinkler system is obtained;

[0036] Determine whether the pressure value is within the preset pressure range;

[0037] If the pressure value is not within the pressure range, a corresponding pressure adjustment signal is generated;

[0038] According to the pressure regulation signal, the pressure in the pipeline of the sprinkler system is adjusted.

[0039] A dual-fuel engine spray system comprises an electric water pump, a water spray device, a water pump control box, a working condition detection unit, a water spray amount adjustment unit and a control unit, wherein the control unit is electrically connected to the water pump control box, the working condition detection unit and the water spray amount adjustment unit respectively; the electric water pump is connected to a water source and the water spray device; the water spray device is arranged in the middle or tail of an engine exhaust pipe, and the water spray device comprises a plurality of nozzles, all of which are arranged in a ring shape; the water pump control box is electrically connected to the electric water pump, and the water pump control box is used to control the electric water pump; the working condition detection unit is used to obtain the current working condition of the engine, and generate a corresponding start-stop signal according to the current working condition, and then transmit the start-stop signal to the control unit; the water spray amount adjustment unit is used to generate a corresponding water amount adjustment signal according to the real-time operating parameters of the engine when the engine is running in a dual-fuel mode, and then transmit the water amount adjustment signal to the control unit, and the control unit then transmits the water amount adjustment signal to the water pump control box, and the water pump control box adjusts the water spray amount by controlling the current frequency of the electric water pump.

[0040] Preferably, the water spray device further comprises a bracket, a connecting flange and a circular water pipe are mounted on the bracket, a plurality of the nozzles are arranged on the circular water pipe, and each of the nozzles is a universal nozzle;

[0041] The connecting flange connects the annular water pipe and the main water pipe of the sprinkler system, and the main water pipe is communicated with the electric water pump.

[0042] Preferably, the spray system further comprises a stop valve, a filter and a pressure gauge, the stop valve and the filter being arranged on the main water pipe between the electric water pump and the water source, and / or a bypass valve being arranged at the outlet or the inlet of the electric water pump; the spray system further comprises a pressure detection unit electrically connected to the control unit, the pressure detection unit being used to obtain the pressure value in the main water pipe, and to determine whether the pressure value is within a preset pressure range, and if the pressure value is not within the pressure range, to generate a corresponding pressure adjustment signal, and then to adjust the stop valve or the bypass valve according to the pressure adjustment signal to adjust the pressure value in the main water pipe.

[0043] Preferably, the water pump control box is further provided with an operation button, the operation button is electrically connected to the control unit and the electric water pump respectively, and the operation button is used to manually control the electric water pump.

[0044] After adopting the above technical solution, the beneficial effects of the present invention are:

[0045] The dual-fuel engine spray system and control method of the present invention mainly utilizes a water pump control box to dynamically control an electric water pump, pressurizes water and sprays it in the middle or outside of the engine exhaust pipe from a water spray nozzle in a mist form, cross-mixes with the exhaust gas discharged from the engine, and dissolves NO x The control method mainly obtains the current operating mode of the engine when the engine is in the starting state, and controls the spray system to start spraying water when the current operating mode is the dual-fuel mode; and in the process of spraying water by the spray system, obtains the real-time operating parameters of the engine, and then generates the corresponding water volume adjustment signal according to the real-time operating parameters, and adjusts the water volume of the spray system according to the water volume adjustment signal, that is, dynamically adjusts the water volume according to the real-time working condition of the engine, and cross-mixes with the exhaust gas discharged by the engine to effectively dissolve NO x It can absorb harmful gases such as carbon smoke and other particulate matter, further reducing engine exhaust emissions. The invention has the advantages of low cost, small installation space, convenient maintenance, strong versatility, flexible layout and quick installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a flow chart of a control method of a dual-fuel engine spray system in the present invention;

[0047] Figure 2 It is a structural schematic diagram of the dual-fuel engine spray system of the present invention;

[0048] Figure 3 It is a structural schematic diagram of the water spray device in the present invention;

[0049] Figure 4It is a principle block diagram of the dual-fuel engine spray system of the present invention;

[0050] In the figure: 1-water source, 2-stop valve, 3-filter, 4-electric water pump, 5-pressure gauge, 6-water spraying device, 60-bracket, 61-connecting flange, 62-universal nozzle, 63-circular water pipe, 7-main water pipe. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0053] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Embodiment 1:

[0055] like Figure 1 As shown, a control method for a dual-fuel engine spray system comprises the following steps:

[0056] Step S10, determining whether the engine is in a starting state;

[0057] Whether the engine is in the starting state can be determined by the engine speed, ignition switch, etc.

[0058] Step S20: if the engine is in the starting state, obtain the current operating mode of the engine;

[0059] It should be noted that: if the engine is not in the starting state, that is, when the engine is in the stopping state, the engine has no exhaust emissions, and there is no need to open the spray system to spray water to treat the exhaust gas. Through the above steps, the present invention realizes the automatic control of the start and stop of the spray system, simplifies the control of the spray system, and simplifies the control of the driver. Of course, the spray system can be provided with a switch button, and the switch button is used to switch the manual control and automatic control of the spray system. When the switch button is set, this step can first determine the state of the switch button. When the state of the switch button corresponds to automatic control, then obtain the current operating mode of the engine. When the state of the switch button corresponds to manual control, execute S10, or issue a corresponding prompt to prompt the driver to ensure the reliable operation of the spray system.

[0060] Step S30, determining whether the current operating mode is a dual-fuel mode; wherein the current operating mode of the engine includes a pure diesel mode and a dual-fuel mode.

[0061] Step S40: if the current operation mode is the dual fuel mode, generate a corresponding water spray opening signal;

[0062] Step S50, controlling the sprinkler system to start spraying water according to the water spraying start signal;

[0063] Step S60, obtaining real-time operating parameters of the engine;

[0064] Step S70: Generate a corresponding water volume adjustment signal according to the real-time operating parameters;

[0065] Step S80: adjusting the water volume of the sprinkler system according to the water volume adjustment signal.

[0066] The control method of the present invention automatically controls the start and stop of the spray system by detecting the start and stop state of the engine. Specifically, when the engine is in a stopped state, the spray system is turned off to reduce energy consumption, etc.; when the engine is in a started state, the spray system is started to allow the spray water to cross-mix with the exhaust gas discharged by the engine, dissolve harmful gases such as NOx, and absorb particulate matter such as soot, thereby effectively reducing the exhaust emission of the engine;

[0067] The present invention specifically controls the spray system by detecting the current operating mode of the engine. When the engine operates in the dual-fuel mode, the spray system is controlled to be in the start-up state all the time so as to continuously spray water and continuously treat the exhaust gas.

[0068] While ensuring continuous exhaust gas treatment, the present invention also controls the spray system in real time by detecting the real-time operating parameters of the engine, thereby realizing dynamic adjustment of the water spray volume of the spray system to achieve a better exhaust gas treatment effect; and the control method of the present invention is simple to operate, low in cost, and can be widely used.

[0069] It should be noted that the dual-fuel engine spray system in this embodiment can apply the dual-fuel engine spray system described in Example 2, see Figure 2 The spray system mainly includes an electric water pump 4, a water spray device 6 and a water pump control box. The water spray device 6 is arranged in the middle or tail of the engine exhaust pipe. The water spray device 6 includes a plurality of nozzles arranged in a ring shape. The electric water pump connects the water source and the water spray device 6. The water pump control box is electrically connected to the electric water pump 4 and the control unit respectively to control the electric water pump 4, and then control the water spraying amount to avoid the engine speed change and the influence on the water spraying amount. In the present invention, the spray system sprays the water in the form of mist from the water spray nozzle after pressurizing the water in the middle or tail of the engine exhaust pipe, and mixes with the exhaust gas of the engine, thereby reducing the emission of the dual-fuel engine and making the dual-fuel engine more green and environmentally friendly.

[0070] like Figure 1 As shown, step S40 of the control method in this embodiment includes the following steps:

[0071] If the current operating mode is not the dual-fuel mode, that is, the current operating mode of the engine is the pure diesel mode, execute step S90;

[0072] Step S90, obtaining current operating parameters of the engine;

[0073] Determine whether the current operating parameters have reached the preset threshold for starting water spraying;

[0074] If the current operating parameters reach the threshold for starting water spraying, a corresponding signal for starting water spraying is generated;

[0075] According to the signal to start water spraying, the sprinkler system is controlled to start water spraying.

[0076] A preferred solution, after starting the water spraying step of the sprinkler system according to the water spraying signal, further includes the following steps:

[0077] Then obtain the current operating parameters of the engine;

[0078] Determine whether the current operating parameters have reached a preset threshold for stopping water spraying;

[0079] If the current operating parameters reach the water spray stop threshold, a corresponding water spray stop signal is generated;

[0080] According to the water spraying shut-off signal, the sprinkler system is controlled to stop spraying water.

[0081] In this embodiment, the current operating parameter may be but is not limited to the current engine speed, as long as the current operating parameter can reflect the exhaust gas condition of the engine, the threshold for starting water injection may be the idle value, and the threshold for stopping water injection may be set to a speed value greater than the idle value, as long as it can indicate a successful engine start.

[0082] Usually when the engine is running in pure diesel mode, after the engine starts normally, the exhaust gas can be treated without starting the spray system, and the spray system can be turned off to reduce energy consumption. During the engine startup process, the spray system is started to spray water, which is mixed with the engine's exhaust gas to reduce the engine's exhaust emissions.

[0083] Through the above steps, the present invention can automatically control the start and stop of the spray system according to the current operating parameters of the engine when the engine is running in the pure fuel mode, thereby simplifying the control of the spray system and the control of the driver. Similarly, the present invention can manually control the start and stop of the spray system, and the specific method is the same as when the engine is running in the dual fuel mode.

[0084] In this embodiment, the real-time operating parameter may be, but is not limited to, the real-time engine speed, as long as it can reflect the exhaust gas condition. At this time, steps S70 and S80 of the control method are specifically:

[0085] When the change state of the real-time operating parameter is increasing, the generated water volume adjustment signal is an increase signal;

[0086] When the change state of the real-time operating parameter is decreasing, the generated water volume adjustment signal is a decreasing signal;

[0087] According to the increase signal, the water spraying amount of the sprinkler system is increased; in this embodiment, according to the increase signal, the current frequency of the electric water pump is increased to increase the water spraying amount of the sprinkler system;

[0088] According to the reduction signal, the water spraying amount of the sprinkler system is reduced. In this embodiment, according to the reduction signal, the current frequency of the electric water pump is reduced to reduce the water spraying amount of the sprinkler system.

[0089] The present invention adjusts the water spraying volume of the spraying system by controlling the current frequency of the electric water pump, so that the change of the engine speed has no direct influence on the change of the water spraying volume of the spraying system. At the same time, the present invention adjusts the water spraying volume in real time according to the real-time change of the engine speed, thereby achieving the best exhaust gas treatment effect.

[0090] The control method of the dual-fuel engine spray system of the present invention further includes the following steps:

[0091] After the sprinkler system starts to spray water according to the water spraying signal, the pressure value in the main water pipe of the sprinkler system is obtained;

[0092] Determine whether the pressure value is within the preset pressure range;

[0093] If the pressure value is not within the pressure range, a corresponding pressure adjustment signal is generated;

[0094] According to the pressure regulation signal, the pressure in the main water pipe of the sprinkler system is adjusted.

[0095] The present invention can ensure the spraying effect of the spray system by real-time monitoring the pressure in the main water pipe, that is, to ensure effective dissolution of harmful gases such as NOx and adsorption of particulate matter such as soot. In addition, in this embodiment, the pressure can be adjusted by adjusting the stop valve, bypass valve, etc. on the main water pipe.

[0096] In summary, the control method of the dual-fuel engine spray system of the present invention realizes the automatic control of the start and stop of the spray system, and also realizes the dynamic adjustment of the water spray volume of the spray system according to the real-time operating conditions of the engine, thereby achieving the best exhaust gas treatment effect; at the same time, the present invention adjusts the water spray volume by controlling the current frequency of the electric water pump to avoid the influence of the engine operating condition change on the water spray volume, thereby ensuring the exhaust gas treatment effect; and the control method of the present invention has the advantages of simple operation, easy implementation and low cost.

[0097] Embodiment 2:

[0098] like Figure 2 , Figure 3 and Figure 4 As shown, a dual-fuel engine spray system can apply the control method described in Example 1. The spray system includes an electric water pump 4, a water spray device 6, a water pump control box, a working condition detection unit, a water spray volume adjustment unit and a control unit. The control unit is electrically connected to the water pump control box, the working condition detection unit and the water spray volume adjustment unit respectively; the control unit can be an engine monitor, an engine electronic control unit, etc.

[0099] In the present invention, the electric water pump 4 is connected to the water source 1 and the water spraying device 6. Specifically, the electric water pump 4 is connected to the water source 1 and the water spraying device 6 through the main water pipe 7. At the same time, the main water pipe 7 is respectively provided with a stop valve 2, a suction filter 3 and a pressure gauge 5. The stop valve 2 and the filter 3 are arranged on the main water pipe 7 between the electric water pump 4 and the water source 1. The stop valve 2 can be used to adjust the pressure value in the main water pipe 7, and the suction filter 3 is used to filter water to prevent impurities in the water from clogging the nozzle; the pressure gauge 5 is used to detect the pressure value in the main water pipe 7, and the pressure gauge 5 can be electrically connected to the control unit to transmit the detected pressure signal to the control unit, and / or, the outlet or inlet of the electric water pump 4 is provided with a bypass valve, and this bypass valve is used to adjust the pressure in the main water pipe 7.

[0100] In the present invention, the water spray device 6 is arranged in the middle or tail of the engine exhaust pipe. The water spray device 6 includes a plurality of nozzles, all of which are arranged in a ring shape. The water spray device 6 also includes a bracket 60, on which a connecting flange 61 and a circular water pipe 63 are installed. A plurality of nozzles are arranged on the circular water pipe 63, and each nozzle is a universal nozzle 62; the connecting flange 61 connects the circular water pipe 63 and the main water pipe 7 of the spray system, and the main water pipe 7 is connected to the electric water pump 4. In actual use, the direction can be adjusted by adjusting the spherical surface and ball seat connection of the universal nozzle 62. A preferred solution is to use a special nut to tighten on the circular water pipe 63, which can be easily removed and replaced with nozzles of different flow rates and apertures.

[0101] In the present invention, the water pump control box is electrically connected to the electric water pump 4, and the water pump control box is used to control the electric water pump 4. In this embodiment, a power supply is provided in the water pump control box, and the power supply is electrically connected to the electric water pump 4. In a preferred embodiment, an operation button is also provided on the water pump control box, and the operation button is electrically connected to the control unit and the electric water pump 4 respectively, and the operation button is used to manually control the electric water pump 4. Specifically, the operation button may include a switching button, and the switching button can switch between manual control and automatic control of the spray system, so that the control of the spray system meets various requirements.

[0102] The operating condition detection unit in the present invention is used to obtain the current operating condition of the engine, and generate a corresponding start-stop signal according to the current operating condition, and then transmit the start-stop signal to the control unit; specifically, the current operating condition may include a start state and a stop state. When the engine is in a start state, a corresponding start signal is generated, and when the engine is in a stop state, a corresponding stop signal is generated, and then the start signal or the stop signal is transmitted to the control unit. The control unit controls the spray system, specifically controls the start and stop of the electric water pump 4, thereby realizing automatic control of the spray system.

[0103] The water spraying amount adjustment unit in the present invention is used when the engine is running in the dual fuel mode. According to the real-time operating parameters of the engine, a corresponding water amount adjustment signal is generated, and then the water amount adjustment signal is transmitted to the control unit. The control unit then transmits the water amount adjustment signal to the water pump control box. The water pump control box adjusts the water spraying amount by controlling the current frequency of the electric water pump 4. Specifically, when the actual operating parameter of the engine is the engine speed, when the change state of the engine speed is increasing, the water amount adjustment signal is to increase the water spraying amount to effectively dissolve the harmful gases or particles in the exhaust gas. When the change state of the engine speed is decreasing, the water amount adjustment signal is to reduce the water spraying amount to reduce energy consumption, thereby realizing the dynamic adjustment of the water spraying amount according to the real-time working conditions of the engine.

[0104] The spray system in the present invention also includes a pressure detection unit electrically connected to the control unit, the pressure detection unit is used to obtain the pressure value in the main water pipe 7, and determine whether the pressure value is within a preset pressure range. If the pressure value is not within the pressure range, a corresponding pressure adjustment signal is generated, and then the stop valve 2 or the bypass valve is adjusted according to the pressure adjustment signal to adjust the pressure value in the main water pipe 7.

[0105] When the dual-fuel engine spray system of the present invention is used, when water spraying is needed, the electric water pump 4 sucks spray water from the water source 1, and after being filtered by the suction filter 3, it is transported to each nozzle of the water spray device 6. The water spray device 6 is installed in the middle or tail of the exhaust pipe, and the water is sprayed in a mist form through the annular nozzles arranged inside the water spray device 6, which is cross-mixed with the exhaust gas discharged by the engine, dissolving harmful gases such as NOx, and absorbing particulate matter such as carbon smoke, thereby effectively reducing the exhaust gas emission of the engine; at the same time, the present invention utilizes the working condition detection unit and the water spray amount adjustment unit to realize automatic control of water spraying, which is convenient The spray system can be started or stopped at will; an electric water pump 4 is used to pump water, and the amount of water sprayed will not be reduced when the engine speed is reduced; there is a control button on the water pump control box, which can be switched to manual control mode, which is more user-friendly; a filter 3 is provided on the pipeline of the spray system to prevent impurities in the water from clogging the nozzle; in addition, the spray system of the present invention has a simple structure, low cost, and is easy to install and construct; if the water spray flow rate is too large, the flow rate at the nozzle can be reduced by a stop valve 2; the water spray angle of the nozzle can be universally adjusted by a ball head and a ball seat, and the nozzles with different nozzle hole diameters can be replaced to adjust the spray effect.

[0106] The spray system of the present invention has the advantages of low cost, small installation space, convenient maintenance, strong versatility, flexible arrangement and quick installation.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made within the spirit and principles of the present invention, as well as improvements to the dual-fuel engine spray system and its control method, etc., should be included in the protection scope of the present invention.

Claims

1. A control method for a dual-fuel engine spray system, characterized in that: The following steps are involved: S10, determining whether the engine is in a starting state; S20: If the engine is in the starting state, obtain the current operating mode of the engine; S30, determining whether the current operating mode is a dual fuel mode; S40, if the current operation mode is the dual fuel mode, generating a corresponding water spray opening signal; S50, controlling the sprinkler system to start spraying water according to the water spraying start signal; S60, obtaining real-time operating parameters of the engine; S70, generating a corresponding water volume adjustment signal according to the real-time operating parameters; S80, adjusting the water spraying amount of the sprinkler system according to the water amount adjustment signal.

2. The control method of the dual-fuel engine spray system according to claim 1, characterized in that: The S40 includes: if the current operation mode is not the dual fuel mode, executing S90; S90, obtaining current operating parameters of the engine; Determine whether the current operating parameters have reached the preset threshold for starting water spraying; If the current operating parameters reach the threshold for starting water spraying, a corresponding signal for starting water spraying is generated; According to the signal to start water spraying, the sprinkler system is controlled to start water spraying.

3. The control method of the dual-fuel engine spray system according to claim 2, characterized in that: After the step of starting the sprinkler system to spray water according to the water spraying signal in S90, the following steps are also included: Then obtain the current operating parameters of the engine; Determine whether the current operating parameters have reached a preset threshold for stopping water spraying; If the current operating parameters reach the water spray stop threshold, a corresponding water spray stop signal is generated; According to the water spraying shut-off signal, the sprinkler system is controlled to stop spraying water.

4. The control method of the dual-fuel engine spray system according to claim 1, characterized in that: The S70 includes: When the change state of the real-time operating parameter is increasing, the generated water volume adjustment signal is an increase signal; When the change state of the real-time operating parameter is decreasing, the generated water volume adjustment signal is a decreasing signal; The S80 includes: According to the increase signal, the water spraying amount of the sprinkler system is increased; According to the reduction signal, the water spraying amount of the sprinkler system is reduced.

5. The control method of the dual-fuel engine spray system according to claim 4, characterized in that: The spray system includes an electric water pump; The S80 further includes: According to the increase signal, the current frequency of the electric water pump is increased to increase the water spraying amount of the sprinkler system; According to the reduction signal, the current frequency of the electric water pump is reduced to reduce the water spraying amount of the sprinkler system.

6. The control method of the dual-fuel engine spray system according to claim 1 or 2, characterized in that: The control method further comprises the following steps: After the sprinkler system starts to spray water according to the water spraying signal, the pressure value in the main water pipe of the sprinkler system is obtained; Determine whether the pressure value is within the preset pressure range; If the pressure value is not within the pressure range, a corresponding pressure adjustment signal is generated; According to the pressure regulation signal, the pressure in the pipeline of the sprinkler system is adjusted.

7. A dual fuel engine spray system, characterized in that: It includes an electric water pump, a water spraying device, a water pump control box, a working condition detection unit, a water spraying amount adjustment unit and a control unit, wherein the control unit is electrically connected to the water pump control box, the working condition detection unit and the water spraying amount adjustment unit respectively; The electric water pump is connected to the water source and the water spray device; The water spray device is arranged in the middle or at the tail of the engine exhaust pipe, and the water spray device comprises a plurality of nozzles, all of which are arranged in a ring shape; The water pump control box is electrically connected to the electric water pump, and the water pump control box is used to control the electric water pump; The operating condition detection unit is used to obtain the current operating condition of the engine, generate a corresponding start-stop signal according to the current operating condition, and then transmit the start-stop signal to the control unit; The water injection amount adjustment unit is used to generate a corresponding water amount adjustment signal according to the real-time operating parameters of the engine when the engine is running in the dual-fuel mode, and then transmit the water amount adjustment signal to the control unit. The control unit then transmits the water amount adjustment signal to the water pump control box. The water pump control box adjusts the water injection amount by controlling the current frequency of the electric water pump.

8. The dual fuel engine spray system according to claim 7, characterized in that: The water spray device further comprises a bracket, on which a connecting flange and a circular water pipe are mounted, a plurality of nozzles are arranged on the circular water pipe, and each nozzle is a universal nozzle; The connecting flange connects the annular water pipe and the main water pipe of the sprinkler system, and the main water pipe is communicated with the electric water pump.

9. The dual fuel engine spray system according to claim 8, characterized in that: The spray system further comprises a stop valve, a filter and a pressure gauge, wherein the stop valve and the filter are arranged on the main water pipe between the electric water pump and the water source, and / or a bypass valve is arranged at the outlet or inlet of the electric water pump; The sprinkler system also includes a pressure detection unit electrically connected to the control unit, and the pressure detection unit is used to obtain the pressure value in the main water pipe and determine whether the pressure value is within a preset pressure range. If the pressure value is not within the pressure range, a corresponding pressure adjustment signal is generated, and then the stop valve or the bypass valve is adjusted according to the pressure adjustment signal to adjust the pressure value in the main water pipe.

10. The dual fuel engine spray system according to claim 7, characterized in that: The water pump control box is also provided with an operation button, which is electrically connected to the control unit and the electric water pump respectively, and is used to manually control the electric water pump.

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