Fuel supply and combustion control method, device, equipment and storage medium

Abstract

The present invention relates to the technical field of fuel supply control, and discloses a fuel supply and combustion control method, device, equipment and storage medium. The method includes: vaporizing liquid ammonia into ammonia gas, and mixing the ammonia gas with air to obtain a mixed gas; transmitting the mixed gas to a double-layer pipe, and determining a temperature control mode according to the fuel supply substitution rate of ammonia; performing temperature control processing on the mixed gas based on the temperature control mode to obtain a processed mixed gas; spraying the processed mixed gas into an engine cylinder through the double-layer pipe to be mixed with diesel to obtain a mixed fuel and then perform combustion. The present invention introduces a double-layer pipe design to prevent the technical drawback of incomplete combustion caused by the re-liquefaction of ammonia gas entering the cylinder, and at the same time determines a suitable temperature control mode based on the fuel supply substitution rate of ammonia, so as to reasonably supply and control the fuel in an ammonia-diesel dual-fuel engine without affecting the temperature control effect.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel supply control, and particularly to a fuel supply and combustion control method, device, equipment, and storage medium. Background Art

[0002] Due to the characteristics of ammonia fuel itself, its boiling point is -33.4°C at normal pressure (0.1 MPa), and its ignition point is 651°C. According to the ammonia saturated vapor pressure comparison table, as the pressure increases, the boiling point rises. During the storage and transportation of ammonia fuel, steel cylinders are used to pressurize it into liquid ammonia for transportation and use. Under the same volume, liquid ammonia can store more than gaseous ammonia. Liquid ammonia is sprayed out through pipelines and ammonia nozzles and instantly vaporizes into ammonia gas. However, ammonia gas requires a high temperature for combustion and burns slowly.

[0003] In the current fuel working background of ammonia-diesel dual-fuel engines, liquid ammonia vaporizes after passing through the nozzle, and vaporization absorbs heat. Different engine operating conditions require different amounts of ammonia fuel. Long-term vaporization with varying amounts of ammonia fuel will cause the temperature of the intake passage to drop, making it easier for fuels and other gases to liquefy. Moreover, the position of the ammonia nozzle is in front of the intake valve. After the turbocharger boosts the pressure, the increase in pressure in the pipeline will cause the boiling point of ammonia fuel to rise, making it easier to turn into a liquid. The fuel atomization effect is poor. When it enters the cylinder, it will cause incomplete fuel combustion, poor emission performance, and environmental pollution; the engine will vibrate, and the operating conditions will deteriorate; fuel will be wasted, and the economy will be poor; the fuel metering is inaccurate, and the injection amount does not match the amount entering the cylinder, making it difficult to meet the requirements of the current operating conditions; a large amount of liquid such as water vapor liquefaction and fuel liquefaction enters the cylinder, and in severe cases, even cylinder flooding may occur, resulting in serious hazards such as engine shutdown and damage. Therefore, there is an urgent need in the industry for a method capable of supplying and controlling the fuel in ammonia-diesel dual-fuel engines.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main object of the present invention is to provide a fuel supply and combustion control method, device, equipment, and storage medium, aiming to solve the technical problem that the prior art cannot supply and control the fuel in ammonia-diesel dual-fuel engines.

[0006] To achieve the above object, the present invention provides a fuel supply and combustion control method, and the method includes the following steps:

[0007] Vaporize liquid ammonia into ammonia gas, and mix the ammonia gas with air to obtain a mixed gas;

[0008] Transmit the mixed gas to a double-layer pipe, and determine a temperature control mode according to the fuel supply substitution rate of the ammonia gas;

[0009] Based on the temperature control mode, perform temperature control processing on the mixed gas to obtain the processed mixed gas;

[0010] Inject the processed mixed gas into the engine cylinder through the double-layer pipe to mix with diesel, and after obtaining the mixed fuel, perform combustion.

[0011] Optionally, the inner pipe of the double-layer pipe passes the mixed gas, the outer pipe of the double-layer pipe passes the circulating cooling water, and the circulating cooling water is used to re-vaporize the liquefied ammonia in the double-layer pipe due to temperature reduction to obtain ammonia gas, and the water flow rate of the circulating cooling water is controlled by an electromagnetic valve.

[0012] Optionally, the step of determining the temperature control mode according to the fuel supply substitution rate of the ammonia gas includes:

[0013] If the fuel supply substitution rate of the ammonia gas is within the first threshold range, determine the temperature control mode as the electric heating mode;

[0014] If the fuel supply substitution rate of the ammonia gas is within the second threshold range, determine the temperature control mode as the cooling water heating mode;

[0015] If the fuel supply substitution rate of the ammonia gas is within the third threshold range, determine the temperature control mode as a mixed heating mode combining the electric heating mode and the cooling water heating mode.

[0016] Optionally, the step of performing temperature control processing on the mixed gas based on the temperature control mode to obtain the processed mixed gas includes:

[0017] If the temperature control mode is the electric heating mode, input a current signal to the thyristor voltage regulator through sliding mode control, so that the electric heater generates a first heat flow based on the current signal;

[0018] Perform temperature control processing on the mixed gas through the first heat flow to obtain the processed mixed gas.

[0019] Optionally, the electric heater generates the first heat flow through an electric heating wire, and the electric heating wire is wound around the outer wall of the inner pipe of the double-layer pipe.

[0020] Optionally, the step of performing temperature control processing on the mixed gas based on the temperature control mode to obtain the processed mixed gas further includes:

[0021] If the temperature control mode is the cooling water heating mode, open the cooling water solenoid valve through sliding mode control so that the cooling water flows into the double-layer pipe to generate a second heat flow;

[0022] The temperature of the mixed gas is controlled by the second heat flow rate to obtain a processed mixed gas.

[0023] Optionally, the step of injecting the processed mixed gas into the engine cylinder through the double-layer pipe to be mixed with diesel to obtain a mixed fuel and then burning it includes:

[0024] Inject the processed mixed gas into the engine cylinder through the double-layer pipe, and detect whether the piston of the engine cylinder reaches the top dead center;

[0025] If so, inject diesel into the engine cylinder, and mix the processed mixed gas in the engine cylinder with the diesel to form a mixed fuel for combustion.

[0026] In addition, to achieve the above object, the present invention also provides a fuel supply and combustion control device, which includes:

[0027] A gas mixing module for vaporizing liquid ammonia into ammonia gas and mixing the ammonia gas with air to obtain a mixed gas;

[0028] A mode determination module for transmitting the mixed gas to the double-layer pipe and determining a temperature control mode according to the fuel supply substitution rate of the ammonia gas;

[0029] A temperature control module for performing temperature control processing on the mixed gas based on the temperature control mode to obtain a processed mixed gas;

[0030] A fuel combustion module for injecting the processed mixed gas into the engine cylinder through the double-layer pipe to be mixed with diesel to obtain a mixed fuel and then burning it.

[0031] In addition, to achieve the above object, the present invention also provides a fuel supply and combustion control device, which includes: a memory, a processor, and a fuel supply and combustion control program stored on the memory and executable on the processor, and the fuel supply and combustion control program is configured to implement the steps of the fuel supply and combustion control method as described above.

[0032] In addition, to achieve the above object, the present invention also provides a storage medium, on which a fuel supply and combustion control program is stored, and when the fuel supply and combustion control program is executed by a processor, the steps of the fuel supply and combustion control method as described above are implemented.

[0033] In the present invention, liquid ammonia is vaporized into ammonia gas, and the ammonia gas is mixed with air to obtain a mixed gas; the mixed gas is transmitted to a double-layer tube, and a temperature control mode is determined according to the fuel supply substitution rate of the ammonia; the mixed gas is subjected to temperature control treatment based on the temperature control mode to obtain a treated mixed gas; the treated mixed gas is sprayed into an engine cylinder through the double-layer tube to be mixed with diesel to obtain a mixed fuel and then burned. Compared with the traditional fuel supply and combustion control methods, since the method of the present invention prevents the technical drawback of incomplete combustion caused by the re-liquefaction of ammonia entering the cylinder by introducing a double-layer tube design, it avoids hazards such as fuel waste, poor emissions, engine vibration, inaccurate fuel delivery and metering, and deteriorated working conditions; at the same time, a suitable temperature control mode is determined based on the fuel supply substitution rate of ammonia, so as to minimize the control cost without affecting the temperature control effect, and further realize the reasonable supply and control of the fuel in the ammonia-diesel dual-fuel engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 FIG. is a schematic structural diagram of a fuel supply and combustion control device for a hardware operating environment related to the solution of an embodiment of the present invention;

[0035] Figure 2 FIG. is a schematic flowchart of a first embodiment of a fuel supply and combustion control method of the present invention;

[0036] Figure 3 FIG. is a schematic flowchart of a second embodiment of a fuel supply and combustion control method of the present invention;

[0037] Figure 4 FIG. is a schematic flowchart of a third embodiment of a fuel supply and combustion control method of the present invention;

[0038] Figure 5 FIG. is a structural block diagram of a first embodiment of a fuel supply and combustion control device of the present invention.

[0039] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] 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.

[0041] Refer to Figure 1 , Figure 1 FIG. is a schematic structural diagram of a fuel supply and combustion control device for a hardware operating environment related to the solution of an embodiment of the present invention.

[0042] As Figure 1As shown in the figure, the fuel supply and combustion control 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. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard. Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a Wireless-Fidelity (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 memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0043] Those skilled in the art can understand that Figure 1 the structure shown in the figure does not constitute a limitation on the fuel supply and combustion control device, and it may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements.

[0044] As Figure 1 shown, the memory 1005, as a storage medium, may include an operating system, a network communication module, a user interface module, and a fuel supply and combustion control program.

[0045] In Figure 1 the fuel supply and combustion control device shown in the figure, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the fuel supply and combustion control device of the present invention may be arranged in the fuel supply and combustion control device. The fuel supply and combustion control device calls the fuel supply and combustion control program stored in the memory 1005 through the processor 1001 and executes the fuel supply and combustion control method provided by the embodiments of the present invention.

[0046] The embodiments of the present invention provide a fuel supply and combustion control method. Referring to Figure 2 , Figure 2 it is a schematic flowchart of the first embodiment of the fuel supply and combustion control method of the present invention.

[0047] In this embodiment, the fuel supply and combustion control method includes the following steps:

[0048] Step S10: Vaporize liquid ammonia into ammonia gas, and mix the ammonia gas with air to obtain a mixed gas.

[0049] It should be noted that the execution subject of the method in this embodiment can be a terminal device with temperature control, data processing, and program running functions, such as a smart phone, a computer, etc., or an electronic device with the same or similar functions, such as the above fuel supply and combustion control device. Hereinafter, the fuel supply and combustion control device (hereinafter referred to as the control device) will be used as an example to illustrate this embodiment and the following embodiments.

[0050] It should be understood that the above liquid ammonia is liquid ammonia fuel. During storage and transportation, steel cylinders are used to pressurize liquid ammonia for transportation and use. Under the same volume, liquid ammonia can store more than gaseous ammonia.

[0051] It can be understood that ammonia is a clean fuel. The substances produced after combustion are mainly water vapor, which is environmentally friendly. Secondly, ammonia can be synthesized from nitrogen and hydrogen, and the by-products in the synthesis process are mainly water vapor, without generating toxic and harmful substances. In addition, ammonia has a high combustion calorific value and a large energy density, and can be used as a high-efficiency energy source.

[0052] In specific implementation, in order to prevent ammonia from chemically reacting with certain components in the air (such as water, carbon dioxide, sulfur dioxide, etc.), thereby affecting the fuel supply of the engine cylinder, ammonia and air can be transported through two transportation pipelines to the intake pipeline of the engine cylinder for mixing, so as to obtain a mixed gas.

[0053] Step S20: Transmit the mixed gas to a double-layer pipe, and determine the temperature control mode according to the fuel supply substitution rate of the ammonia.

[0054] It should be noted that the above double-layer pipe can be a pipe with a double-layer structure composed of an outer pipe and an inner pipe. The inner pipe can be used to pass the above mixed gas, and the outer pipe can be used to pass circulating cooling water. Among them, the above circulating cooling water can be used to vaporize the liquid ammonia liquefied due to temperature reduction in the double-layer pipe again to obtain ammonia gas, and the water flow rate of the above circulating cooling water can be controlled by a solenoid valve.

[0055] It should be understood that in order to prevent ammonia or other ammonia compounds from corroding the double-layer pipe, the material of the double-layer pipe can be a material that does not react with ammonia or other ammonia compounds, such as stainless steel, polyethylene, polypropylene, etc. This embodiment does not limit this.

[0056] It is understandable that the above-mentioned fuel supply substitution rate of ammonia can refer to the degree of substitution of using ammonia as an energy source. Generally speaking, the fuel supply substitution rate of ammonia can also represent the supply amount of ammonia when it is used as a fuel. The above temperature control mode can include an electric heating mode, a cooling water heating mode, an electromagnetic induction (eddy current) heating mode, an exhaust gas heating mode, etc., and this embodiment does not limit this.

[0057] It should be understood that the above temperature control mode can include a temperature feedback system. According to the temperature in the double-layer tube air duct, it is fed back to the ecu controller (electronic control unit), and then heat supplement is carried out. The size of the cooling water circulation heating flow and the size of the electric auxiliary heat supplement are determined according to the ammonia fuel intake (that is, the fuel supply substitution rate of ammonia), the temperature in the air duct at this time, and the cooling water temperature at this time.

[0058] Step S30: Based on the temperature control mode, perform temperature control processing on the mixed gas to obtain the processed mixed gas.

[0059] In a specific implementation, the above-mentioned mixed gas can be subjected to temperature control processing based on the above electric heating mode, cooling water heating mode, electromagnetic induction (eddy current) heating mode, exhaust gas heating mode, etc., so as to obtain the processed mixed gas.

[0060] It should be understood that according to fluid mechanics, under different working conditions, different amounts of ammonia fuel are required and different air intake amounts are different. Therefore, different air inlet flow rates are designed to achieve more sufficient mixing of air and ammonia. When the ammonia fuel required by the engine working condition decreases, the air volume also decreases. However, if the air flow rate decreases accordingly, it will cause insufficient mixing of ammonia fuel and air, resulting in low combustion efficiency, poor fuel economy waste, and environmental pollution from emissions. Then, at this time, the cross-section becomes smaller and the air flow rate is increased to match the air flow rate and the ammonia fuel amount at this time to achieve sufficient mixing. When the ammonia fuel required by the engine increases, the air volume also increases correspondingly, then the variable conical cross-section contracts and the cross-section becomes larger to match the air flow rate and the ammonia fuel amount at this time to ensure more air and ammonia fuel are mixed. Further, the turbulence and gas rotation can be increased by adding fan blades, so that the gas just passing through the variable conical cross-section has a certain flow rate after preliminary mixing, and then is further fully mixed and enters the cylinder to achieve more sufficient combustion. In particular, the number of the above fan blades can be determined according to the actual working conditions. Too many fan blades will increase the gas resistance, and too few fan blades will cause uneven gas mixing under different working conditions.

[0061] Step S40: Inject the processed mixed gas into the engine cylinder through the double-layer tube to be mixed with diesel, and after obtaining the mixed fuel, perform combustion.

[0062] It should be noted that the above engine cylinder can be a cylindrical metal container, usually made of cast iron or aluminum alloy. The cylinder is a combustion chamber inside the engine, and it completes the four basic working cycles of intake, compression, explosion, and exhaust through the up and down movement of the piston.

[0063] In a specific implementation, the combustion process of the above mixed fuel can be described based on the following stages. Intake Stroke: The piston moves downward from the top of the cylinder, and the valve in the cylinder opens, allowing the processed mixed gas and diesel to enter the cylinder through the intake port. Compression Stroke: The piston moves upward from the bottom of the cylinder, the valve closes, compressing the processed mixed gas and diesel to obtain the mixed fuel, increasing its density, and raising the temperature and pressure. Power Stroke: When the piston reaches the top dead center, the spark plug generates a spark, triggering the combustion of the mixed fuel. The high-temperature and high-pressure gas generated by the combustion pushes the piston downward, driving the crankshaft to rotate. Exhaust Stroke: The piston moves upward again, exhausting the burned exhaust gas out of the cylinder through the exhaust port.

[0064] In this embodiment, liquid ammonia is vaporized into ammonia gas, and the ammonia gas is mixed with air to obtain a mixed gas; the mixed gas is transmitted to a double-layer pipe, and a temperature control mode is determined according to the fuel supply substitution rate of the ammonia gas; the mixed gas is subjected to temperature control processing based on the temperature control mode to obtain a processed mixed gas; the processed mixed gas is sprayed into the engine cylinder through the double-layer pipe to be mixed with diesel to obtain a mixed fuel for combustion; the inner pipe of the double-layer pipe passes the mixed gas, and the outer pipe of the double-layer pipe passes circulating cooling water. The circulating cooling water is used to vaporize the liquid ammonia liquefied due to temperature reduction in the double-layer pipe again to obtain ammonia gas, and the water flow rate of the circulating cooling water is controlled by an electromagnetic valve. Compared with the traditional fuel supply and combustion control methods, since the method in this embodiment prevents the technical drawbacks of incomplete combustion caused by the re-liquefaction of ammonia gas entering the cylinder by introducing the double-layer pipe design, it avoids hazards such as fuel waste, poor emissions, engine vibration, inaccurate fuel delivery and metering, and deteriorated working conditions; at the same time, a suitable temperature control mode is determined based on the fuel supply substitution rate of ammonia gas, so as to minimize the control cost without affecting the temperature control effect, and further realize the reasonable supply and control of the fuel in the ammonia-diesel dual-fuel engine.

[0065] Reference Figure 3 , Figure 3 is a schematic flow chart of the second embodiment of the fuel supply and combustion control method of the present invention.

[0066] Based on the above first embodiment, in this embodiment, the step S20 may include:

[0067] Step S201: If the fuel supply substitution rate of the ammonia is within the first threshold range, determine that the temperature control mode is the electric heating mode.

[0068] It should be noted that the above first threshold range can be in the form of a percentage range, for example, greater than 0% and less than 30%, and this embodiment does not limit this.

[0069] Step S202: If the fuel supply substitution rate of the ammonia is within the second threshold range, determine that the temperature control mode is the cooling water heating mode.

[0070] It should be noted that the above second threshold range can also be in the form of a percentage range, for example, greater than 30% and less than 60%, and this embodiment does not limit this.

[0071] Step S203: If the fuel supply substitution rate of the ammonia is within the third threshold range, determine that the temperature control mode is a hybrid heating mode combining the electric heating mode and the cooling water heating mode.

[0072] It should be noted that the above third threshold range can also be in the form of a percentage range, for example, greater than 60% and less than 90%, and this embodiment does not limit this.

[0073] Further, in this embodiment, the step S30 may include:

[0074] Step S301: If the temperature control mode is the electric heating mode, input a current signal to the thyristor voltage regulator through sliding mode control, so that the electric heater generates a first heat flow rate based on the current signal.

[0075] It should be noted that the above thyristor voltage regulator is a power electronic device, also known as a voltage modulator or silicon controlled rectifier. It is mainly used in AC power systems and adjusts the output voltage by controlling the conduction angle of the current. This device usually includes thyristor elements, such as thyristors. The thyristor voltage regulator can include a rectification stage and a voltage regulation stage. In the rectification stage, the thyristor voltage regulator can be used to convert the AC power supply into a DC power supply. It allows the current to pass only in the positive or negative half cycle, achieving half-wave or full-wave rectification of the alternating current. In the voltage regulation stage, the thyristor voltage regulator can adjust the time for the current to pass by changing the conduction angle of the thyristor element, thereby affecting the output voltage. The change of the conduction angle can be achieved by controlling the trigger pulse in the control circuit.

[0076] It should be understood that the above electric heater can generate the above first heat flow rate through the heating wire, and the above heating wire can be wound around the outer wall of the inner tube of the double-layer tube.

[0077] Step S302: Perform temperature control processing on the mixed gas through the first heat flow rate to obtain the processed mixed gas.

[0078] In this embodiment, if the fuel supply substitution rate of ammonia is within the first threshold range, the temperature control mode is determined to be the electric heating mode; if the fuel supply substitution rate of ammonia is within the second threshold range, the temperature control mode is determined to be the cooling water heating mode; if the fuel supply substitution rate of ammonia is within the third threshold range, the temperature control mode is determined to be a hybrid heating mode combining the electric heating mode and the cooling water heating mode; if the temperature control mode is the electric heating mode, input a current signal to the thyristor voltage regulator through sliding mode control, so that the electric heater generates a first heat flow rate based on the current signal; perform temperature control processing on the mixed gas through the first heat flow rate to obtain the processed mixed gas; the electric heater generates the first heat flow rate through the heating wire, and the heating wire is wound around the outer wall of the inner tube of the double-layer tube. Compared with the traditional fuel supply and combustion control methods, the above method in this embodiment determines a suitable temperature control mode based on the fuel supply substitution rate of ammonia, thereby minimizing the control cost without affecting the temperature control effect, and further realizing the reasonable supply and control of the fuel in the ammonia-diesel dual-fuel engine.

[0079] Reference Figure 4 , Figure 4 is a schematic flowchart of the third embodiment of the fuel supply and combustion control method of the present invention.

[0080] Based on the above embodiments, in this embodiment, the step S30 may further include:

[0081] Step S303: If the temperature control mode is the cooling water heating mode, control the opening degree of the cooling water solenoid valve through sliding mode control, so that the cooling water flows into the double-layer tube to generate a second heat flow rate.

[0082] It should be noted that the above cooling water solenoid valve is an electromagnetic control valve, which is usually used to control the water flow in the cooling system. The cooling water solenoid valve realizes the control of the flow or cut-off of the cooling water through electromagnetic control. The solenoid valve usually consists of an electromagnetic coil, a valve body and a valve core. When an electric current passes through the electromagnetic coil, the generated magnetic field causes the valve core to move in the valve body, changing the opening state of the valve, so as to adjust the passing amount of the cooling water, so that the cooling water flows into the above double-layer tube to generate a second heat flow rate.

[0083] Step S304: Perform temperature control processing on the mixed gas through the second heat flow rate to obtain the processed mixed gas.

[0084] It is understandable that the above-mentioned Sliding Mode Control (SMC) is a non-linear control method, whose goal is to maintain a "sliding mode" or "sliding surface" on the state trajectory of the system. The core idea of sliding mode control is to introduce a sliding surface, so that the system state slides on this surface in a certain way, thereby realizing the stable control of the system. Sliding mode control has the advantages of strong robustness, good tracking performance, small overshoot, fast response and strong anti-interference ability. In this embodiment, the input current signal of the thyristor voltage regulator and the opening degree of the cooling water solenoid valve can be adjusted quickly by adopting sliding mode control, respectively, for the heat flow generated by the electric heater and the heat release of the cooling water circulation. According to the ammonia fuel supply, the two heating modes complement each other to achieve strong interference from the external environment, fast adjustment speed, good economy, matching the ammonia gas required under various working conditions of the engine, and complete vaporization of liquid ammonia, thereby improving the fuel combustion rate, reducing carbon emissions and avoiding cylinder flooding.

[0085] Based on the above embodiments, in this embodiment, the step S40 may include:

[0086] Step S401: Inject the processed mixed gas into the engine cylinder through the double-layer pipe, and detect whether the piston of the engine cylinder reaches the top dead center.

[0087] Step S402: If so, inject diesel into the engine cylinder, and mix the processed mixed gas in the engine cylinder with the diesel to form a mixed fuel for combustion.

[0088] In this embodiment, if the temperature control mode is the cooling water heating mode, the opening degree of the cooling water solenoid valve is controlled by sliding mode control, so that the cooling water flows into the double-layer pipe to generate a second heat flow; the processed mixed gas is obtained by controlling the temperature of the mixed gas through the second heat flow; the processed mixed gas is injected into the engine cylinder through the double-layer pipe, and it is detected whether the piston of the engine cylinder reaches the top dead center; if so, diesel is injected into the engine cylinder, and the processed mixed gas in the engine cylinder is mixed with the diesel to form a mixed fuel for combustion. Compared with the traditional fuel supply and combustion control methods, the above method in this embodiment prevents the technical drawbacks of incomplete combustion caused by the re-liquefaction of ammonia gas entering the cylinder by introducing the double-layer pipe design, thereby avoiding hazards such as fuel waste, poor emissions, engine jitter, inaccurate fuel delivery and metering, and deterioration of working conditions; at the same time, a suitable temperature control mode is determined based on the fuel supply substitution rate of ammonia, so as to minimize the control cost without affecting the temperature control effect, and further realize the reasonable supply and control of the fuel in the ammonia-diesel dual-fuel engine.

[0089] In addition, an embodiment of the present invention further provides a storage medium, on which a fuel supply and combustion control program is stored. When the fuel supply and combustion control program is executed by a processor, the steps of the fuel supply and combustion control method described above are implemented.

[0090] Referring Figure 5 , Figure 5 is a structural block diagram of the first embodiment of the fuel supply and combustion control device of the present invention.

[0091] As Figure 5 shown, the fuel supply and combustion control device proposed in the embodiment of the present invention includes:

[0092] A gas mixing module 501, configured to vaporize liquid ammonia into ammonia gas, and mix the ammonia gas with air to obtain a mixed gas;

[0093] A mode determination module 502, configured to transmit the mixed gas to a double-layer pipe, and determine a temperature control mode according to the fuel supply substitution rate of the ammonia gas;

[0094] A temperature control module 503, configured to perform temperature control processing on the mixed gas based on the temperature control mode to obtain a processed mixed gas;

[0095] A fuel combustion module 504, configured to spray the processed mixed gas into an engine cylinder through the double-layer pipe to be mixed with diesel to obtain a mixed fuel and then perform combustion.

[0096] In this embodiment, liquid ammonia is vaporized into ammonia gas, and the ammonia gas is mixed with air to obtain a mixed gas; the mixed gas is transmitted to a double-layer pipe, and a temperature control mode is determined according to the fuel supply substitution rate of the ammonia gas; temperature control processing is performed on the mixed gas based on the temperature control mode to obtain a processed mixed gas; the processed mixed gas is sprayed into an engine cylinder through the double-layer pipe to be mixed with diesel to obtain a mixed fuel and then perform combustion. Compared with the traditional fuel supply and combustion control method, since the method in this embodiment introduces a double-layer pipe design to prevent the technical drawback of incomplete combustion caused by the re-liquefaction of ammonia gas entering the cylinder, it avoids hazards such as fuel waste, poor emissions, engine jitter, inaccurate fuel delivery and metering, and deteriorated working conditions; at the same time, a suitable temperature control mode is determined based on the fuel supply substitution rate of ammonia gas, so as to minimize the control cost without affecting the temperature control effect, and further realize the reasonable supply and control of fuel in an ammonia-diesel dual-fuel engine.

[0097] Based on the first embodiment of the fuel supply and combustion control device of the present invention, a second embodiment of the fuel supply and combustion control device of the present invention is proposed.

[0098] In this embodiment, the mode determination module 502 is further configured to determine the temperature control mode as the electric heating mode if the fuel supply substitution rate of the ammonia is within the first threshold range; determine the temperature control mode as the cooling water heating mode if the fuel supply substitution rate of the ammonia is within the second threshold range; and determine the temperature control mode as the hybrid heating mode combining the electric heating mode and the cooling water heating mode if the fuel supply substitution rate of the ammonia is within the third threshold range.

[0099] Further, the temperature control module 503 is further configured to, if the temperature control mode is the electric heating mode, input a current signal to the thyristor voltage regulator through sliding mode control, so that the electric heater generates a first heat flux based on the current signal; perform temperature control processing on the mixed gas through the first heat flux to obtain the processed mixed gas. The electric heater generates the first heat flux through the heating wire, and the heating wire is wound around the outer wall of the inner tube of the double-layer tube.

[0100] Further, the temperature control module 503 is further configured to, if the temperature control mode is the cooling water heating mode, control the opening degree of the cooling water solenoid valve through sliding mode control, so that the cooling water flows into the double-layer tube to generate a second heat flux; perform temperature control processing on the mixed gas through the second heat flux to obtain the processed mixed gas. The inner tube of the double-layer tube passes the mixed gas, and the outer tube of the double-layer tube passes the circulating cooling water. The circulating cooling water is used to vaporize the liquefied ammonia in the double-layer tube due to temperature reduction to obtain ammonia gas, and the water flow rate of the circulating cooling water is controlled by the solenoid valve.

[0101] Further, the fuel combustion module 504 is further configured to inject the processed mixed gas into the engine cylinder through the double-layer tube, and detect whether the piston of the engine cylinder reaches the top dead center; if so, inject diesel into the engine cylinder, and mix the processed mixed gas in the engine cylinder with the diesel to form a mixed fuel for combustion.

[0102] Other embodiments or specific implementation manners of the fuel supply and combustion control device of the present invention may refer to the above method embodiments, and will not be elaborated here.

[0103] It should be noted that in this document, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or system comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or system. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or system comprising such element.

[0104] The serial numbers of the embodiments of the present invention above are only for description and do not represent the superiority or inferiority of the embodiments.

[0105] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory / random access memory, magnetic disk, optical disk), and includes several instructions for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0106] The above are only the preferred embodiments of the present invention and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the description of the present invention and the drawings, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A fuel supply and combustion control method, characterized in that: The method comprises the following steps: Vaporizing liquid ammonia into ammonia gas, and transporting the ammonia gas and air through a separation pipeline to an intake pipeline of an engine cylinder for mixing to obtain a mixed gas; The mixed gas is transmitted to a double-layer tube, and a temperature control mode is determined according to the fuel supply replacement rate of the ammonia gas, wherein the mixed gas is passed through an inner tube of the double-layer tube and circulating cooling water is passed through an outer tube of the double-layer tube; Performing temperature control processing on the mixed gas based on the temperature control mode to obtain a processed mixed gas; When the ammonia fuel required for engine operation decreases, the amount of air decreases accordingly, and the variable conical section is controlled to shrink, and the turbulence and gas rotation are increased through the fan blades to fully mix the air and ammonia; When the amount of ammonia fuel required for engine operation increases, the amount of air increases accordingly, and the variable conical cross section is controlled to expand, and the fan blades are used to increase turbulence and gas rotation, so that the air and ammonia are fully mixed; The treated mixed gas is sprayed into the engine cylinder through the double-layer tube to mix with diesel, and then the mixed fuel is burned; The step of determining the temperature control mode according to the fuel supply replacement rate of the ammonia gas comprises: If the fuel supply replacement rate of the ammonia is within the first threshold interval, determining that the temperature control mode is the electric heating mode; If the fuel supply replacement rate of the ammonia gas is within the second threshold interval, the temperature control mode is determined to be a cooling water heating mode, wherein the cooling water circulation heating flow rate of the cooling water heating mode is determined according to the fuel supply replacement rate of the ammonia gas, the current airway temperature, and the current cooling water temperature; If the fuel supply replacement rate of the ammonia is within the third threshold interval, determining that the temperature control mode is a hybrid heating mode combining the electric heating mode and the cooling water heating mode; The step of performing temperature control processing on the mixed gas based on the temperature control mode to obtain the processed mixed gas includes: If the temperature control mode is an electric heating mode, a current signal is input to the thyristor voltage regulator through sliding mode control, so that the electric heater generates a first heat flow based on the current signal; Performing temperature control processing on the mixed gas by using the first heat flow to obtain a processed mixed gas; The step of performing temperature control processing on the mixed gas based on the temperature control mode to obtain the processed mixed gas also includes: If the temperature control mode is a cooling water heating mode, the cooling water solenoid valve is opened by sliding mode control so that the cooling water flows into the double-layer tube to generate a second heat flow; The mixed gas is subjected to temperature control processing by the second heat flow to obtain a processed mixed gas.

2. The fuel supply and combustion control method according to claim 1, characterized in that: The circulating cooling water is used to re-vaporize the liquid ammonia liquefied due to the temperature reduction in the double-layer tube to obtain ammonia gas, and the water flow of the circulating cooling water is controlled by a solenoid valve.

3. The fuel supply and combustion control method according to claim 1, characterized in that: The electric heater generates the first heat flow through a heating wire, and the heating wire is wrapped around the outer wall of the inner tube of the double-layer tube.

4. The fuel supply and combustion control method according to claim 1, characterized in that: The step of injecting the treated mixed gas into the engine cylinder through the double-layer tube to mix with diesel to obtain the mixed fuel and then burning it comprises: Spraying the processed mixed gas into the engine cylinder through the double-layer tube, and detecting whether the piston of the engine cylinder reaches the top dead center; If yes, the diesel is sprayed into the engine cylinder, and the treated mixed gas in the engine cylinder is mixed with the diesel to form a mixed fuel for combustion.

5. A fuel supply and combustion control device, characterized in that: The fuel supply and combustion control device comprises: A gas mixing module, used for vaporizing liquid ammonia into ammonia gas, and transporting the ammonia gas and air through a separation pipeline to an intake pipeline of an engine cylinder for mixing to obtain a mixed gas; a mode determination module, used for transmitting the mixed gas to a double-layer tube and determining a temperature control mode according to the fuel supply substitution rate of the ammonia gas, wherein the mixed gas is passed through an inner tube of the double-layer tube and circulating cooling water is passed through an outer tube of the double-layer tube; A temperature control module, used for performing temperature control processing on the mixed gas based on the temperature control mode to obtain a processed mixed gas; The temperature control module is also used to control the variable conical cross section to shrink when the amount of air correspondingly decreases under the engine operating condition, and increase turbulence and gas rotation through the fan blades to fully mix the air and ammonia; when the amount of air correspondingly increases under the engine operating condition, the variable conical cross section is controlled to expand, and increase turbulence and gas rotation through the fan blades to fully mix the air and ammonia; A fuel combustion module, used for spraying the treated mixed gas into the engine cylinder through the double-layer tube to mix with diesel, and then burning the obtained mixed fuel; The mode determination module is further configured to determine that the temperature control mode is an electric heating mode if the fuel supply substitution rate of the ammonia is within a first threshold interval; determine that the temperature control mode is a cooling water heating mode if the fuel supply substitution rate of the ammonia is within a second threshold interval, wherein the cooling water circulation heating flow rate of the cooling water heating mode is determined according to the fuel supply substitution rate of the ammonia, the current airway temperature, and the current cooling water temperature; and determine that the temperature control mode is a hybrid heating mode combining the electric heating mode and the cooling water heating mode if the fuel supply substitution rate of the ammonia is within a third threshold interval; The temperature control module is further configured to, if the temperature control mode is an electric heating mode, input a current signal to the thyristor voltage regulator through sliding mode control so that the electric heater generates a first heat flow based on the current signal; and perform temperature control processing on the mixed gas through the first heat flow to obtain a processed mixed gas; The temperature control module is also used to, if the temperature control mode is a cooling water heating mode, open the cooling water solenoid valve through sliding mode control so that cooling water flows into the double-layer tube to generate a second heat flow; and perform temperature control on the mixed gas through the second heat flow to obtain a treated mixed gas.

6. A fuel supply and combustion control device, characterized in that: The device includes: a memory, a processor, and a fuel supply and combustion control program stored in the memory and executable on the processor, wherein the fuel supply and combustion control program is configured to implement the steps of the fuel supply and combustion control method as described in any one of claims 1 to 4.

7. A storage medium, characterized in that: The storage medium stores a fuel supply and combustion control program, which, when executed by a processor, implements the steps of the fuel supply and combustion control method according to any one of claims 1 to 4.

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