Control method, control device and electronic device for thawing and heating urea

Abstract

The application provides a control method and device for urea thawing and heating and an electronic device. The method comprises: determining whether urea in a urea tank is in an ice-water mixture state; in the case that the urea is in the ice-water mixture state, determining a first target opening temperature, the first target opening temperature being a sum of a first preset opening temperature and a first predetermined value, the first predetermined value being greater than 0, and the first preset opening temperature being a preset temperature of water in the tank when an electromagnetic valve is opened; in the case that an actual temperature of water in the tank reaches the first target opening temperature, controlling the electromagnetic valve to be opened; and in the case that the electromagnetic valve is opened, at least one of the following is performed: controlling the engine speed to increase, and controlling the engine gear to decrease. The application solves the problem that the urea in the urea tank is in the ice-water mixture state, thereby causing the vehicle to be limited in speed and torque.

Description

Technical Field

[0001] This application relates to the field of engine exhaust gas purification and control, and more specifically, to a control method, control device, and electronic equipment for urea defrosting and heating. Background Technology

[0002] According to the China VI emission standards, vehicles should be equipped with catalytic converters to reduce NO2. Most vehicles have a urea tank containing urea (ammonia, etc.), which is injected through nozzles to reduce NO2. x Catalytic reduction reaction. In extremely cold weather, urea easily freezes. Regulations require manufacturers to ensure that the reactant is usable within 70 minutes of vehicle operation at an ambient temperature of 256K (-17℃). Currently, urea thawing and heating generally involves thawing and heating the urea tank, urea pump, suction pipe, return pipe, and pressure pipe. Urea tank heating typically uses a solenoid valve for water heating, while the other four are usually electrically heated by heating resistance wires. When the urea in the tank is frozen, the water heating works from the inside out, and the ice provides excellent insulation, resulting in rapid thawing. However, when the urea in the tank is an ice-water mixture (around -11℃), under specific ambient temperature and water flow rates, the heat dissipation from the urea tank balances with the water heating, causing urea thawing to be incomplete for an extended period. If thawing is not completed within 70 minutes, the vehicle will be limited in speed and torque, affecting not only vehicle performance but also emissions. Summary of the Invention

[0003] The main objective of this application is to provide a control method, control device, and electronic device for urea thawing and heating, so as to at least solve the problem in the prior art where urea in the urea tank is in a state of ice-water mixture, resulting in vehicle speed and torque limitation.

[0004] To achieve the above objectives, according to one aspect of this application, a control method for urea defrosting and heating is provided. The engine includes a solenoid valve, a water tank, and a urea tank. A first end of the urea tank is connected to a first end of the solenoid valve, and a second end of the solenoid valve is connected to a first end of the water tank. The method includes: determining whether the urea in the urea tank is in an ice-water mixture state; if the urea is in the ice-water mixture state, determining a first target opening temperature, wherein the first target opening temperature is the sum of a first preset opening temperature and a first predetermined value, the first predetermined value being greater than 0, and the first preset opening temperature being a preset temperature of the water in the water tank when the solenoid valve is opened; if the actual temperature of the water in the water tank reaches the first target opening temperature, controlling the solenoid valve to open; and if the solenoid valve is open, performing at least one of the following: controlling the engine speed to increase, and controlling the engine gear to decrease.

[0005] Optionally, the engine further includes an air intake grille located on one side of the water tank. The method further includes: when the solenoid valve is open, determining a second target opening temperature, the second target opening temperature being the sum of a second preset opening temperature and a second predetermined value, the second predetermined value being greater than 0, and the second preset opening temperature being a preset temperature of the water in the water tank when the air intake grille is open; and controlling the air intake grille to open when the actual temperature of the water in the water tank reaches the second target opening temperature.

[0006] Optionally, the engine further includes a thermostat connected to the second end of the water tank. The method further includes: when the solenoid valve is open, determining a third target opening temperature, the third target opening temperature being the sum of a third preset opening temperature and a third predetermined value, the third predetermined value being greater than 0, and the third preset opening temperature being a preset temperature of the water in the water tank when the thermostat is open; and when the actual temperature of the water in the water tank reaches the third target opening temperature, controlling the thermostat to open.

[0007] Optionally, the engine further includes: a urea pump, a suction pipe, a return pipe, and a pressure pipe. The first end of the suction pipe is connected to the second end of the urea tank, the second end of the suction pipe is connected to the first end of the urea pump, the second end of the urea pump is connected to the first end of the pressure pipe, the second end of the pressure pipe is connected to the first end of the return pipe, the second end of the return pipe is connected to the third end of the urea tank, and the third end of the urea pump is connected to the fourth end of the urea tank. The method further includes: when the solenoid valve is open, controlling the urea pump to operate so that pressure is built up and backflow occurs between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe, so that the urea in the urea tank passes sequentially through the suction pipe, the urea pump, the pressure pipe, and the return pipe, and returns to the urea tank.

[0008] Optionally, determining whether the urea in the urea tank is in an ice-water mixture state includes: acquiring the current ambient temperature and the urea tank temperature; and determining that the urea is in the ice-water mixture state when the ambient temperature is less than a fourth predetermined value and the urea tank temperature is within a predetermined range.

[0009] Optionally, the first predetermined value is a×(t1-ET), where a is a first predetermined coefficient, t1 is the fourth predetermined value, and ET is the ambient temperature; the second predetermined value is b×(t1-ET), where b is a second predetermined coefficient; the third predetermined value is c×(t1-ET), where c is a third predetermined coefficient; the predetermined range is t-△t≤ST≤t, where t is the temperature at which the urea begins to freeze, ST is the temperature of the urea tank, △t is a fifth predetermined value, and △t is greater than 0.

[0010] Optionally, the engine further includes multiple resistance wires, each of which is located on one side of the urea pump, one side of the suction pipe, one side of the return pipe, and one side of the pressure pipe. When the solenoid valve is open, controlling the urea pump to operate allows pressure to be built up and backflow to occur between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe. This includes: controlling the multiple resistance wires to electrically heat the urea pump, the suction pipe, the return pipe, and the pressure pipe; and controlling the urea pump to operate after controlling the multiple resistance wires to electrically heat the urea pump, the suction pipe, the return pipe, and the pressure pipe for a predetermined time, thereby allowing pressure to be built up and backflow to occur between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe.

[0011] Optionally, the method further includes: when the solenoid valve is open, issuing a reminder signal to the terminal, the reminder signal being a signal indicating that the urea is in the state of the ice-water mixture.

[0012] According to another aspect of this application, a control device for urea defrosting and heating is provided. The engine includes a solenoid valve, a water tank, and a urea tank. A first end of the urea tank is connected to a first end of the solenoid valve, and a second end of the solenoid valve is connected to a first end of the water tank. The device includes: a first determining unit for determining whether the urea in the urea tank is in an ice-water mixture state; a second determining unit for determining a first target opening temperature when the urea is in the ice-water mixture state, wherein the first target opening temperature is the sum of a first preset opening temperature and a first predetermined value, the first predetermined value being greater than 0, and the first preset opening temperature being a preset temperature of the water in the water tank when the solenoid valve is opened; a first control unit for controlling the solenoid valve to open when the actual temperature of the water in the water tank reaches the first target opening temperature; and a second control unit for performing at least one of the following when the solenoid valve is open: controlling the engine speed to increase, and controlling the engine gear to decrease.

[0013] According to another aspect of this application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including control methods for performing any of the urea thawing and heating methods described above.

[0014] By applying the technical solution of this application, it is first determined whether the urea in the urea tank is in an ice-water mixture state. When the urea is in an ice-water mixture state, the opening temperature of the solenoid valve is determined to be a first target opening temperature that is greater than the first preset opening temperature. When the actual temperature of the water in the tank is the first target opening temperature, the solenoid valve is controlled to open. After the solenoid valve is opened, the engine speed is controlled to increase and / or the engine gear is controlled to decrease. Compared to existing technologies where urea in the urea tank is in an ice-water mixture state, leading to vehicle speed and torque limitations, this application determines the opening temperature of the solenoid valve to be a first target opening temperature that is higher than the first preset opening temperature when the urea is in an ice-water mixture state. This ensures that when the solenoid valve opens, the actual water temperature in the tank is relatively high, guaranteeing a higher water temperature entering the urea tank to heat the urea, thus ensuring a better urea defrosting effect. Furthermore, after the solenoid valve opens, since the water pump is connected to the crankshaft, controlling the engine speed to increase and / or controlling the engine gear to decrease allows the crankshaft to rotate faster, resulting in faster water pump operation. This ensures a larger water flow rate for heating the urea, thus guaranteeing a better urea defrosting and heating effect. This ensures that there is sufficient liquid urea in the urea tank to undergo a catalytic reduction reaction with the vehicle exhaust, minimizing the risk of excessive vehicle exhaust emissions and avoiding speed and torque limitations caused by excessive emissions, thereby ensuring normal vehicle operation. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for performing a control method for urea thawing and heating according to an embodiment of this application is shown.

[0017] Figure 2 A schematic flowchart of a control method for urea thawing and heating according to an embodiment of this application is shown.

[0018] Figure 3 A schematic flowchart of a specific urea thawing and heating control method according to an embodiment of this application is shown.

[0019] Figure 4 A structural block diagram of a control device for urea thawing and heating according to an embodiment of this application is shown.

[0020] The above figures include the following reference numerals:

[0021] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] As described in the background section, in the prior art, the urea in the urea tank is in a state of ice-water mixture, which causes the vehicle to be limited in speed and torque. In order to solve the above problems, the embodiments of this application provide a control method, control device and electronic device for urea defrosting and heating.

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0027] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a urea thawing and heating control method according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0028] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the urea thawing and heating control method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0029] This embodiment provides a control method for urea thawing and heating that runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than that shown here.

[0030] Figure 2This is a flowchart of a control method for urea defrosting and heating according to an embodiment of this application. The engine includes a solenoid valve, a water tank, and a urea tank. A first end of the urea tank is connected to a first end of the solenoid valve, and a second end of the solenoid valve is connected to a first end of the water tank. Figure 2 As shown, the method includes the following steps:

[0031] Step S201: Determine whether the urea in the urea tank is in an ice-water mixture state;

[0032] Step S202: When the urea is in the state of the ice-water mixture, a first target opening temperature is determined. The first target opening temperature is the sum of a first preset opening temperature and a first predetermined value. The first predetermined value is greater than 0. The first preset opening temperature is the preset temperature of the water in the water tank when the solenoid valve is opened.

[0033] In practical applications, those skilled in the art can set the aforementioned first preset opening temperature based on experience, or it can be obtained through multiple experiments; this application does not impose specific limitations in this regard. In the embodiments of this application, the aforementioned first preset opening temperature is 55°C.

[0034] Step S203: When the actual temperature of the water in the water tank reaches the first target opening temperature, control the solenoid valve to open.

[0035] In step S204, when the solenoid valve is open, at least one of the following is performed: controlling the engine speed to increase, or controlling the engine gear to decrease.

[0036] Through the above embodiments, it is first determined whether the urea in the urea tank is in an ice-water mixture state. When the urea is in an ice-water mixture state, the opening temperature of the solenoid valve is determined to be a first target opening temperature that is greater than the first preset opening temperature. When the actual temperature of the water in the tank is the first target opening temperature, the solenoid valve is controlled to open. After the solenoid valve is opened, the engine speed is controlled to increase and / or the engine gear is controlled to decrease. Compared to existing technologies where urea in the urea tank is in an ice-water mixture state, leading to vehicle speed and torque limitations, this application determines the opening temperature of the solenoid valve to be a first target opening temperature that is higher than the first preset opening temperature when the urea is in an ice-water mixture state. This ensures that when the solenoid valve opens, the actual water temperature in the tank is relatively high, guaranteeing a higher water temperature entering the urea tank to heat the urea, thus ensuring a better urea defrosting effect. Furthermore, after the solenoid valve opens, since the water pump is connected to the crankshaft, controlling the engine speed to increase and / or controlling the engine gear to decrease allows the crankshaft to rotate faster, resulting in faster water pump operation. This ensures a larger water flow rate for heating the urea, thus guaranteeing a better urea defrosting and heating effect. This ensures that there is sufficient liquid urea in the urea tank to undergo a catalytic reduction reaction with the vehicle exhaust, minimizing the risk of excessive vehicle exhaust emissions and avoiding speed and torque limitations caused by excessive emissions, thereby ensuring normal vehicle operation.

[0037] In one alternative embodiment, the engine further includes an air intake grille located on one side of the water tank. The method further includes: when the solenoid valve is open, determining a second target opening temperature, wherein the second target opening temperature is the sum of a second preset opening temperature and a second predetermined value, the second predetermined value being greater than 0, and the second preset opening temperature being a preset temperature of the water in the water tank when the air intake grille is open; and controlling the air intake grille to open when the actual temperature of the water in the water tank reaches the second target opening temperature. In this embodiment, after the solenoid valve is opened, the opening temperature of the air intake grille is determined to be a second target opening temperature that is greater than the second preset opening temperature. Since opening the air intake grille will cause the vehicle to dissipate heat, thereby causing the actual temperature of the water in the water tank to decrease, by increasing the opening temperature of the air intake grille, the opening time of the air intake grille is effectively delayed, further ensuring that the actual temperature of the water in the water tank drops less, further ensuring that the water heating has a better effect on the defrosting heating of urea, further ensuring that the risk of vehicle exhaust emissions exceeding the standard is low, further avoiding vehicle speed and torque limitation caused by excessive exhaust emissions, and thus further ensuring that the vehicle can drive normally.

[0038] In practical applications, those skilled in the art can set the above-mentioned second preset opening temperature based on experience, or it can be obtained through multiple experiments. This application does not impose any specific restrictions on this.

[0039] In other embodiments, the engine further includes a thermostat connected to the second end of the water tank. The method further includes: when the solenoid valve is open, determining a third target opening temperature, wherein the third target opening temperature is the sum of a third preset opening temperature and a third predetermined value, the third predetermined value being greater than 0, and the third preset opening temperature being the preset temperature of the water in the water tank when the thermostat is opened; and controlling the thermostat to open when the actual temperature of the water in the water tank reaches the third target opening temperature. In this embodiment, after the solenoid valve is opened, the opening temperature of the thermostat is determined to be a third target opening temperature that is greater than the third preset opening temperature. Since the opening of the thermostat causes water to flow through the radiator, which lowers the actual temperature of the water, increasing the opening temperature of the thermostat effectively delays the opening time of the thermostat, further ensuring that the actual temperature of the water drops less, further ensuring that the water heating has a better effect on the defrosting heating of urea, further ensuring that the risk of vehicle exhaust emissions exceeding standards is low, further avoiding vehicle speed and torque limits caused by excessive exhaust emissions, and further ensuring that the vehicle can drive normally.

[0040] Specifically, the thermostat can be an electronic thermostat, a mechanical thermostat, or other types of thermostats; this application does not impose any specific restrictions on this.

[0041] In this embodiment of the application, the thermostat is an electronic thermostat.

[0042] In practical applications, those skilled in the art can set the aforementioned third preset opening temperature based on experience, or it can be obtained through multiple experiments. This application does not impose any specific restrictions on this.

[0043] In this embodiment of the application, the third preset opening temperature is 85°C.

[0044] According to some exemplary embodiments of this application, the engine further includes: a urea pump, a suction pipe, a return pipe, and a pressure pipe. The first end of the suction pipe is connected to the second end of the urea tank, the second end of the suction pipe is connected to the first end of the urea pump, the second end of the urea pump is connected to the first end of the pressure pipe, the second end of the pressure pipe is connected to the first end of the return pipe, the second end of the return pipe is connected to the third end of the urea tank, and the third end of the urea pump is connected to the fourth end of the urea tank. The method further includes: when the solenoid valve is open, controlling the urea pump to operate so that pressure is built up and backflow occurs between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe, so that the urea in the urea tank passes sequentially through the suction pipe, the urea pump, the pressure pipe, and the return pipe, and returns to the urea tank. In this embodiment, after the solenoid valve is opened, the urea pump is controlled to operate so that pressure is built up and backflow occurs between the urea tank, the urea pump, the suction pipe, the return pipe, and the pressure pipe. During pressure building, the urea is electrically heated using the urea pump, the suction pipe, the pressure pipe, and the return pipe. During backflow, the heated urea is drawn back into the urea tank, thus heating the urea in the urea tank. This further ensures a better defrosting and heating effect for the urea, further ensures a lower risk of vehicle exhaust emissions exceeding standards, further avoids vehicle speed and torque limits caused by excessive exhaust emissions, and further ensures that the vehicle can drive normally.

[0045] Specifically, the operation of the urea pump is controlled to periodically build pressure and reverse suction between the urea tank, the urea pump, the suction pipe, the return pipe, and the pressure pipe. Depending on the urea pump's operating efficiency, after several cycles, the urea pump can be stopped for a period of time, and then restarted to begin the cycle again.

[0046] In another exemplary embodiment, determining whether the urea in the urea tank is in an ice-water mixture state includes: acquiring the current ambient temperature and the urea tank temperature; and determining that the urea is in the ice-water mixture state when the ambient temperature is less than a fourth predetermined value and the urea tank temperature is within a predetermined range. In this embodiment, acquiring the ambient temperature and the urea tank temperature, and determining that the urea is in an ice-water mixture state when the ambient temperature is less than the fourth predetermined value and the urea tank temperature is within a predetermined range, ensures that the determination of the urea state is relatively accurate and convenient, preparing for a series of subsequent operations to defrost and heat the urea.

[0047] Specifically, the temperature of the urea tank can be obtained by a urea tank temperature sensor located on the urea tank, and the ambient temperature can be obtained by an ambient temperature sensor.

[0048] In practical applications, those skilled in the art can set the aforementioned fourth predetermined value based on experience, or obtain it through multiple experiments; this application does not impose any specific restrictions on this.

[0049] In this embodiment, the fourth predetermined value is -18°C.

[0050] According to some other exemplary embodiments of this application, the first predetermined value is a×(t1-ET), where a is a first predetermined coefficient, t1 is the fourth predetermined value, and ET is the ambient temperature; the second predetermined value is b×(t1-ET), where b is a second predetermined coefficient; the third predetermined value is c×(t1-ET), where c is a third predetermined coefficient; the predetermined range is t-△t≤ST≤t, where t is the temperature at which the urea begins to freeze, ST is the temperature of the urea tank, △t is a fifth predetermined value, and △t is greater than 0. In this embodiment, the first predetermined value, the second predetermined value, the third predetermined value, and the predetermined range are further defined. Of course, the calculation methods of the first predetermined value, the second predetermined value, and the third predetermined value are not limited to the above calculation formulas, and can also be other calculation formulas. This application does not impose specific limitations on this.

[0051] In practical applications, those skilled in the art can set the first predetermined coefficient, the second predetermined coefficient, the third predetermined coefficient, and the fifth predetermined value based on experience, or obtain them through multiple experiments. This application does not impose any specific restrictions on this.

[0052] In this embodiment of the application, t is -11℃, and the fifth predetermined value mentioned above is 2℃.

[0053] To further ensure a better effect on urea defrosting and heating, in some alternative embodiments of this application, the engine further includes multiple resistance wires, each located on one side of the urea pump, one side of the suction pipe, one side of the return pipe, and one side of the pressure pipe. When the solenoid valve is open, the urea pump is controlled to operate so that pressure is built up and backflow occurs between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe. This includes: controlling the multiple resistance wires to electrically heat the urea pump, the suction pipe, the return pipe, and the pressure pipe; and controlling the urea pump to operate after controlling the multiple resistance wires to electrically heat the urea pump, the suction pipe, the return pipe, and the pressure pipe for a predetermined time so that pressure is built up and backflow occurs between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe. In this embodiment, after controlling multiple resistance wires to electrically heat the urea pump, suction pipe, return pipe, and pressure pipe for a predetermined time, the urea pump is controlled to run so that pressure is built up and backflow occurs between the urea tank and the urea pump, suction pipe, return pipe, and pressure pipe. This allows the urea pump, suction pipe, return pipe, and pressure pipe to be preheated in advance, ensuring that the temperature of the urea pump, suction pipe, return pipe, and pressure pipe is relatively high, thereby allowing the urea to thaw better.

[0054] Specifically, after controlling multiple resistance wires to electrically heat the urea pump, the suction pipe, the return pipe, and the pressure pipe for the predetermined time, it is determined that the temperature of the urea pump, the suction pipe, the return pipe, and the pressure pipe reaches the required predetermined temperature. At this time, the urea pump is then controlled to operate so that pressure is built up and backflow occurs between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe.

[0055] In practical applications, those skilled in the art can set the above-mentioned predetermined duration based on experience, or it can be obtained through multiple experiments. This application does not impose any specific restrictions on this.

[0056] In other embodiments, the method further includes: when the solenoid valve is open, issuing a reminder signal to the terminal, wherein the reminder signal is a signal indicating that the urea is in the state of the ice-water mixture. In this embodiment, by issuing a reminder signal to the terminal, the user can be informed of the urea's state of being in an ice-water mixture, allowing the user to adjust the vehicle's driving parameters based on this information.

[0057] Specifically, the aforementioned terminal can be an instrument or other types of equipment. In actual applications, those skilled in the art can flexibly select a suitable terminal according to actual needs, and this application does not impose any specific restrictions on this.

[0058] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the urea thawing and heating control method of this application will be described in detail below with reference to specific embodiments.

[0059] This embodiment relates to a specific method for controlling the heating of urea during thawing, such as... Figure 3 As shown, it includes the following steps:

[0060] Step S1: Obtain the current ambient temperature and urea tank temperature. If the ambient temperature is less than the fourth predetermined value and the urea tank temperature is within the predetermined range, determine that the urea is in an ice-water mixture state. The predetermined range is t-△t≤ST≤t, where t is the temperature at which the urea begins to freeze, ST is the urea tank temperature, △t is the fifth predetermined value, and △t is greater than 0.

[0061] Step S2: When the urea is in the state of ice-water mixture, determine the first target opening temperature. The first target opening temperature is the sum of the first preset opening temperature and the first predetermined value. The first predetermined value is greater than 0. When the actual temperature of the water in the water tank reaches the first target opening temperature, control the solenoid valve to open. The first predetermined value is a×(t1-ET), where a is the first predetermined coefficient, t1 is the fourth predetermined value, ET is the ambient temperature, and the first preset opening temperature is the preset temperature of the water in the water tank when the solenoid valve is opened.

[0062] Step S3: With the solenoid valve open, control the engine speed to increase and control the engine gear to decrease;

[0063] Step S4: With the solenoid valve open, determine the second target opening temperature. The second target opening temperature is the sum of the second preset opening temperature and the second predetermined value. The second predetermined value is greater than 0. When the actual temperature of the water in the water tank reaches the second target opening temperature, control the air intake grille to open. The second predetermined value is b×(t1-ET), where b is the second predetermined coefficient. The second preset opening temperature is the preset temperature of the water in the water tank when the air intake grille is opened.

[0064] Step S5: With the solenoid valve open, determine the third target opening temperature. The third target opening temperature is the sum of the third preset opening temperature and the third predetermined value. The third predetermined value is greater than 0. When the actual temperature of the water in the water tank reaches the third target opening temperature, control the thermostat to open. The third predetermined value is c×(t1-ET), where c is the third predetermined coefficient. The third preset opening temperature is the preset temperature of the water in the water tank when the thermostat is opened.

[0065] Step S6: With the solenoid valve open, control multiple resistance wires to electrically heat the urea pump, suction pipe, return pipe, and pressure pipe. After controlling the multiple resistance wires to electrically heat the urea pump, suction pipe, return pipe, and pressure pipe for a predetermined time, control the urea pump to run so that pressure is built up and backflow occurs between the urea tank and the urea pump, suction pipe, return pipe, and pressure pipe, so that the urea in the urea tank passes through the suction pipe, urea pump, pressure pipe, and return pipe in sequence and returns to the urea tank.

[0066] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0067] This application also provides a control device for urea thawing and heating. It should be noted that this control device can be used to execute the control method for urea thawing and heating provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0068] The following describes the control device for urea thawing and heating provided in the embodiments of this application.

[0069] Figure 4 This is a schematic diagram of a control device for urea defrosting and heating according to an embodiment of this application. The engine includes a solenoid valve, a water tank, and a urea tank. A first end of the urea tank is connected to a first end of the solenoid valve, and a second end of the solenoid valve is connected to a first end of the water tank. Figure 4 As shown, the device includes:

[0070] The first determining unit 10 is used to determine whether the urea in the urea tank is in an ice-water mixture state.

[0071] The second determining unit 20 is used to determine a first target opening temperature when the urea is in the state of the ice-water mixture. The first target opening temperature is the sum of a first preset opening temperature and a first predetermined value. The first predetermined value is greater than 0. The first preset opening temperature is the preset temperature of the water in the water tank when the solenoid valve is opened.

[0072] In practical applications, those skilled in the art can set the aforementioned first preset opening temperature based on experience, or it can be obtained through multiple experiments; this application does not impose specific limitations in this regard. In the embodiments of this application, the aforementioned first preset opening temperature is 55°C.

[0073] The first control unit 30 is used to control the solenoid valve to open when the actual temperature of the water in the water tank reaches the first target opening temperature.

[0074] The second control unit 40 is configured to perform at least one of the following when the solenoid valve is open: control the engine speed to increase, or control the engine gear to decrease.

[0075] In the above embodiments, the first determining unit determines whether the urea in the urea tank is in an ice-water mixture state. When the urea is in an ice-water mixture state, the second determining unit determines that the opening temperature of the solenoid valve is a first target opening temperature that is higher than the first preset opening temperature. When the actual temperature of the water in the tank is the first target opening temperature, the first control unit controls the solenoid valve to open. After the solenoid valve is opened, the second control unit controls the engine speed to increase and / or controls the engine gear to decrease. Compared to existing technologies where urea in the urea tank is in an ice-water mixture state, leading to vehicle speed and torque limitations, this application determines the opening temperature of the solenoid valve to be a first target opening temperature that is higher than the first preset opening temperature when the urea is in an ice-water mixture state. This ensures that when the solenoid valve opens, the actual water temperature in the tank is relatively high, guaranteeing a higher water temperature entering the urea tank to heat the urea, thus ensuring a better urea defrosting effect. Furthermore, after the solenoid valve opens, since the water pump is connected to the crankshaft, controlling the engine speed to increase and / or controlling the engine gear to decrease allows the crankshaft to rotate faster, resulting in faster water pump operation. This ensures a larger water flow rate for heating the urea, thus guaranteeing a better urea defrosting and heating effect. This ensures that there is sufficient liquid urea in the urea tank to undergo a catalytic reduction reaction with the vehicle exhaust, minimizing the risk of excessive vehicle exhaust emissions and avoiding speed and torque limitations caused by excessive emissions, thereby ensuring normal vehicle operation.

[0076] In one alternative embodiment, the engine further includes an air intake grille located on one side of the water tank. The device further includes: a third determining unit, configured to determine a second target opening temperature when the solenoid valve is open, wherein the second target opening temperature is the sum of a second preset opening temperature and a second predetermined value, wherein the second predetermined value is greater than 0, and the second preset opening temperature is a preset temperature of the water in the water tank when the air intake grille is open; and a third control unit, configured to control the air intake grille to open when the actual temperature of the water in the water tank reaches the second target opening temperature. In this embodiment, after the solenoid valve is opened, the opening temperature of the air intake grille is determined to be a second target opening temperature that is higher than the second preset opening temperature. Since opening the air intake grille will cause the vehicle to dissipate heat, thereby causing the actual temperature of the water in the water tank to drop, by increasing the opening temperature of the air intake grille, the opening time of the air intake grille is effectively delayed, further ensuring that the actual temperature of the water in the water tank drops less, further ensuring that the water heating has a better effect on the defrosting heating of urea, further ensuring that the risk of vehicle exhaust emissions exceeding the standard is low, further avoiding the vehicle speed and torque limitation caused by excessive exhaust emissions, and thus further ensuring that the vehicle can drive normally.

[0077] In practical applications, those skilled in the art can set the above-mentioned second preset opening temperature based on experience, or it can be obtained through multiple experiments. This application does not impose any specific restrictions on this.

[0078] In other embodiments, the engine further includes a thermostat connected to the second end of the water tank. The device further includes: a fourth determining unit, configured to determine a third target opening temperature when the solenoid valve is open, wherein the third target opening temperature is the sum of a third preset opening temperature and a third predetermined value, the third predetermined value being greater than 0, and the third preset opening temperature being the preset temperature of the water in the water tank when the thermostat is open; and a fourth control unit, configured to control the thermostat to open when the actual temperature of the water in the water tank reaches the third target opening temperature. In this embodiment, after the solenoid valve is opened, the opening temperature of the thermostat is determined to be a third target opening temperature that is higher than the third preset opening temperature. Since the opening of the thermostat causes water to flow through the radiator, which lowers the actual temperature of the water, increasing the opening temperature of the thermostat effectively delays the opening time of the thermostat, further ensuring that the actual temperature of the water drops less, further ensuring that the water heating has a better effect on the defrosting heating of urea, further ensuring that the risk of vehicle exhaust emissions exceeding standards is low, further avoiding vehicle speed and torque limits caused by excessive exhaust emissions, and further ensuring that the vehicle can drive normally.

[0079] Specifically, the thermostat can be an electronic thermostat, a mechanical thermostat, or other types of thermostats; this application does not impose any specific restrictions on this.

[0080] In this embodiment of the application, the thermostat is an electronic thermostat.

[0081] In practical applications, those skilled in the art can set the aforementioned third preset opening temperature based on experience, or it can be obtained through multiple experiments. This application does not impose any specific restrictions on this.

[0082] In this embodiment of the application, the third preset opening temperature is 85°C.

[0083] According to some exemplary embodiments of this application, the engine further includes: a urea pump, a suction pipe, a return pipe, and a pressure pipe. The first end of the suction pipe is connected to the second end of the urea tank, the second end of the suction pipe is connected to the first end of the urea pump, the second end of the urea pump is connected to the first end of the pressure pipe, the second end of the pressure pipe is connected to the first end of the return pipe, the second end of the return pipe is connected to the third end of the urea tank, and the third end of the urea pump is connected to the fourth end of the urea tank. The device further includes: a fifth control unit, used to control the operation of the urea pump when the solenoid valve is open, so that pressure is built up and backflow occurs between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe, so that the urea in the urea tank passes sequentially through the suction pipe, the urea pump, the pressure pipe, and the return pipe, and returns to the urea tank. In this embodiment, after the solenoid valve is opened, the urea pump is controlled to operate so that pressure is built up and backflow occurs between the urea tank, the urea pump, the suction pipe, the return pipe, and the pressure pipe. During pressure building, the urea is electrically heated using the urea pump, the suction pipe, the pressure pipe, and the return pipe. During backflow, the heated urea is drawn back into the urea tank, thus heating the urea in the urea tank. This further ensures a better defrosting and heating effect for the urea, further ensures a lower risk of vehicle exhaust emissions exceeding standards, further avoids vehicle speed and torque limits caused by excessive exhaust emissions, and further ensures that the vehicle can drive normally.

[0084] Specifically, the operation of the urea pump is controlled to periodically build pressure and reverse suction between the urea tank, the urea pump, the suction pipe, the return pipe, and the pressure pipe. Depending on the urea pump's operating efficiency, after several cycles, the urea pump can be stopped for a period of time, and then restarted to begin the cycle again.

[0085] In another exemplary embodiment, the first determining unit includes: an acquisition module for acquiring the current ambient temperature and the urea tank temperature; and a determining module for determining that the urea is in the ice-water mixture state when the ambient temperature is less than a fourth predetermined value and the urea tank temperature is within a predetermined range. In this embodiment, acquiring the ambient temperature and the urea tank temperature, and determining that the urea is in the ice-water mixture state when the ambient temperature is less than the fourth predetermined value and the urea tank temperature is within a predetermined range, ensures that the determination of the urea state is relatively accurate and convenient, preparing for subsequent operations of thawing and heating the urea.

[0086] Specifically, the temperature of the urea tank can be obtained by a urea tank temperature sensor located on the urea tank, and the ambient temperature can be obtained by an ambient temperature sensor.

[0087] In practical applications, those skilled in the art can set the aforementioned fourth predetermined value based on experience, or obtain it through multiple experiments; this application does not impose any specific restrictions on this.

[0088] In this embodiment, the fourth predetermined value is -18°C.

[0089] According to some other exemplary embodiments of this application, the first predetermined value is a×(t1-ET), where a is a first predetermined coefficient, t1 is the fourth predetermined value, and ET is the ambient temperature; the second predetermined value is b×(t1-ET), where b is a second predetermined coefficient; the third predetermined value is c×(t1-ET), where c is a third predetermined coefficient; the predetermined range is t-△t≤ST≤t, where t is the temperature at which the urea begins to freeze, ST is the temperature of the urea tank, △t is a fifth predetermined value, and △t is greater than 0. In this embodiment, the first predetermined value, the second predetermined value, the third predetermined value, and the predetermined range are further defined. Of course, the calculation methods of the first predetermined value, the second predetermined value, and the third predetermined value are not limited to the above calculation formulas, and can also be other calculation formulas. This application does not impose specific limitations on this.

[0090] In practical applications, those skilled in the art can set the first predetermined coefficient, the second predetermined coefficient, the third predetermined coefficient, and the fifth predetermined value based on experience, or obtain them through multiple experiments. This application does not impose any specific restrictions on this.

[0091] In this embodiment of the application, t is -11℃, and the fifth predetermined value mentioned above is 2℃.

[0092] To further ensure a better effect in urea defrosting and heating, in some alternative embodiments of this application, the engine further includes multiple resistance wires, each of which is located on one side of the urea pump, one side of the suction pipe, one side of the return pipe, and one side of the pressure pipe. The fifth control unit includes: a first control module for controlling the multiple resistance wires to electrically heat the urea pump, the suction pipe, the return pipe, and the pressure pipe; and a second control module for controlling the urea pump to operate so that pressure is built up and backflow occurs between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe when the multiple resistance wires are electrically heated to the urea pump, the suction pipe, the return pipe, and the pressure pipe for a predetermined time. In this embodiment, after controlling multiple resistance wires to electrically heat the urea pump, suction pipe, return pipe, and pressure pipe for a predetermined time, the urea pump is controlled to run so that pressure is built up and backflow occurs between the urea tank and the urea pump, suction pipe, return pipe, and pressure pipe. This allows the urea pump, suction pipe, return pipe, and pressure pipe to be preheated in advance, ensuring that the temperature of the urea pump, suction pipe, return pipe, and pressure pipe is relatively high, thereby allowing the urea to thaw better.

[0093] Specifically, after controlling multiple resistance wires to electrically heat the urea pump, the suction pipe, the return pipe, and the pressure pipe for the predetermined time, it is determined that the temperature of the urea pump, the suction pipe, the return pipe, and the pressure pipe reaches the required predetermined temperature. At this time, the urea pump is then controlled to operate so that pressure is built up and backflow occurs between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe.

[0094] In practical applications, those skilled in the art can set the above-mentioned predetermined duration based on experience, or it can be obtained through multiple experiments. This application does not impose any specific restrictions on this.

[0095] In other embodiments, the device further includes a sending unit, configured to send a reminder signal to a terminal when the solenoid valve is open, the reminder signal being a signal indicating that the urea is in the state of the ice-water mixture. In this embodiment, by sending a reminder signal to the terminal, the user can be informed of the urea's state of being in an ice-water mixture, allowing the user to adjust the vehicle's driving parameters based on this information.

[0096] Specifically, the aforementioned terminal can be an instrument or other types of equipment. In actual applications, those skilled in the art can flexibly select a suitable terminal according to actual needs, and this application does not impose any specific restrictions on this.

[0097] The aforementioned urea thawing and heating control device includes a processor and a memory. The first determining unit, the second determining unit, the first control unit, and the second control unit are all stored as program units in the memory. The processor executes these program units stored in the memory to achieve the corresponding functions. All of the above modules reside in the same processor; alternatively, the modules may be located in different processors in any combination.

[0098] This invention provides an electronic device, including: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include a control method for performing any of the above-described urea thawing and heating methods.

[0099] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0100] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0101] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1A device that provides the functions specified in one or more boxes.

[0102] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0103] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0104] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0105] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0106] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0107] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0108] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0109] 1) In the urea defrosting and heating control method of this application, it is first determined whether the urea in the urea tank is in an ice-water mixture state. When the urea is in an ice-water mixture state, the opening temperature of the solenoid valve is determined to be a first target opening temperature that is greater than the first preset opening temperature. When the actual temperature of the water in the tank is the first target opening temperature, the solenoid valve is controlled to open. After the solenoid valve is opened, the engine speed is controlled to increase and / or the engine gear is controlled to decrease. Compared to existing technologies where urea in the urea tank is in an ice-water mixture state, leading to vehicle speed and torque limitations, this application determines the opening temperature of the solenoid valve to be a first target opening temperature that is higher than the first preset opening temperature when the urea is in an ice-water mixture state. This ensures that when the solenoid valve opens, the actual water temperature in the tank is relatively high, guaranteeing a higher water temperature entering the urea tank to heat the urea, thus ensuring a better urea defrosting effect. Furthermore, after the solenoid valve opens, since the water pump is connected to the crankshaft, controlling the engine speed to increase and / or controlling the engine gear to decrease allows the crankshaft to rotate faster, resulting in faster water pump operation. This ensures a larger water flow rate for heating the urea, thus guaranteeing a better urea defrosting and heating effect. This ensures that there is sufficient liquid urea in the urea tank to undergo a catalytic reduction reaction with the vehicle exhaust, minimizing the risk of excessive vehicle exhaust emissions and avoiding speed and torque limitations caused by excessive emissions, thereby ensuring normal vehicle operation.

[0110] 2) In the urea defrosting and heating control device of this application, the first determining unit determines whether the urea in the urea tank is in an ice-water mixture state. When the urea is in an ice-water mixture state, the second determining unit determines that the opening temperature of the solenoid valve is a first target opening temperature that is higher than the first preset opening temperature. When the actual temperature of the water in the tank is the first target opening temperature, the first control unit controls the solenoid valve to open. After the solenoid valve is opened, the second control unit controls the engine speed to increase and / or controls the engine gear to decrease. Compared to existing technologies where urea in the urea tank is in an ice-water mixture state, leading to vehicle speed and torque limitations, this application determines the opening temperature of the solenoid valve to be a first target opening temperature that is higher than the first preset opening temperature when the urea is in an ice-water mixture state. This ensures that when the solenoid valve opens, the actual water temperature in the tank is relatively high, guaranteeing a higher water temperature entering the urea tank to heat the urea, thus ensuring a better urea defrosting effect. Furthermore, after the solenoid valve opens, since the water pump is connected to the crankshaft, controlling the engine speed to increase and / or controlling the engine gear to decrease allows the crankshaft to rotate faster, resulting in faster water pump operation. This ensures a larger water flow rate for heating the urea, thus guaranteeing a better urea defrosting and heating effect. This ensures that there is sufficient liquid urea in the urea tank to undergo a catalytic reduction reaction with the vehicle exhaust, minimizing the risk of excessive vehicle exhaust emissions and avoiding speed and torque limitations caused by excessive emissions, thereby ensuring normal vehicle operation.

[0111] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control method for urea defrosting and heating, comprising an engine including a solenoid valve, a water tank, and a urea tank, wherein a first end of the urea tank is connected to a first end of the solenoid valve, a second end of the solenoid valve is connected to a first end of the water tank, the crankshaft of the engine is connected to a water pump, and the water pump is used to allow water from the water tank to enter the urea tank through the solenoid valve to heat the urea, characterized in that, include: Determine whether the urea in the urea tank is in an ice-water mixture state; When the urea is in the state of the ice-water mixture, a first target opening temperature is determined. The first target opening temperature is the sum of a first preset opening temperature and a first predetermined value. The first predetermined value is greater than 0. The first preset opening temperature is the preset temperature of the water in the tank when the solenoid valve is opened. When the actual temperature of the water in the water tank reaches the first target opening temperature, the solenoid valve is controlled to open. When the solenoid valve is open, at least one of the following is performed: controlling the engine speed to increase, controlling the engine gear to decrease, thereby increasing the speed of the water pump connected to the crankshaft and increasing the water flow rate for heating the urea.

2. The method for controlling the urea thawing and heating according to claim 1, characterized in that, The engine also includes an air intake grille located on one side of the water tank, and the method further includes: When the solenoid valve is open, a second target opening temperature is determined. The second target opening temperature is the sum of a second preset opening temperature and a second predetermined value. The second predetermined value is greater than 0. The second preset opening temperature is the preset temperature of the water in the water tank when the air intake grille is opened. When the actual temperature of the water in the water tank reaches the second target opening temperature, the air intake grille is controlled to open.

3. The method for controlling the urea thawing and heating according to claim 2, characterized in that, The engine further includes a thermostat, the thermostat being connected to a second end of the water tank, and the method further includes: When the solenoid valve is open, a third target opening temperature is determined. The third target opening temperature is the sum of a third preset opening temperature and a third predetermined value. The third predetermined value is greater than 0. The third preset opening temperature is the preset temperature of the water in the water tank when the thermostat is opened. When the actual temperature of the water in the water tank reaches the third target opening temperature, the thermostat is controlled to open.

4. The method for controlling the urea thawing and heating according to any one of claims 1 to 3, characterized in that, The engine further includes: a urea pump, a suction pipe, a return pipe, and a pressure pipe. The first end of the suction pipe is connected to the second end of the urea tank; the second end of the suction pipe is connected to the first end of the urea pump; the second end of the urea pump is connected to the first end of the pressure pipe; the second end of the pressure pipe is connected to the first end of the return pipe; the second end of the return pipe is connected to the third end of the urea tank; and the third end of the urea pump is connected to the fourth end of the urea tank. The method further includes: When the solenoid valve is open, the urea pump is controlled to operate so that pressure is built up and backflow occurs between the urea tank and the urea pump, the suction pipe, the return pipe and the pressure pipe, so that the urea in the urea tank passes through the suction pipe, the urea pump, the pressure pipe and the return pipe in sequence and returns to the urea tank.

5. The method for controlling the urea thawing and heating according to claim 3, characterized in that, Determining whether the urea in the urea tank is in an ice-water mixture state includes: Obtain the current ambient temperature and urea tank temperature; If the ambient temperature is less than a fourth predetermined value and the urea tank temperature is within a predetermined range, the urea is determined to be in the state of the ice-water mixture.

6. The method for controlling the urea thawing and heating according to claim 5, characterized in that, The first predetermined value is a×(t1-ET), where a is the first predetermined coefficient, t1 is the fourth predetermined value, and ET is the ambient temperature; The second predetermined value is b×(t1-ET), where b is the second predetermined coefficient; The third predetermined value is c×(t1-ET), where c is the third predetermined coefficient; The predetermined range is t-△t≤ST≤t, where t is the temperature at which the urea begins to freeze, ST is the temperature of the urea tank, △t is the fifth predetermined value, and △t is greater than 0.

7. The method for controlling the urea thawing and heating according to claim 4, characterized in that, The engine also includes multiple resistance wires, each located on one side of the urea pump, one side of the suction pipe, one side of the return pipe, and one side of the pressure pipe. When the solenoid valve is open, it controls the urea pump to operate, thereby establishing pressure and reverse suction between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe, including: The multiple resistance wires are controlled to electrically heat the urea pump, the suction pipe, the return pipe, and the pressure pipe; While controlling the multiple resistance wires to electrically heat the urea pump, the suction pipe, the return pipe, and the pressure pipe for a predetermined time, the urea pump is controlled to operate so that pressure is built up and backflow occurs between the urea tank and the urea pump, the suction pipe, the return pipe, and the pressure pipe.

8. The method for controlling the thawing and heating of urea according to any one of claims 1 to 3, characterized in that, The method further includes: When the solenoid valve is open, a reminder signal is sent to the terminal. The reminder signal is a signal indicating that the urea is in the state of the ice-water mixture.

9. A control device for urea defrosting and heating, comprising an engine including a solenoid valve, a water tank, and a urea tank, wherein a first end of the urea tank is connected to a first end of the solenoid valve, a second end of the solenoid valve is connected to a first end of the water tank, the crankshaft of the engine is connected to a water pump, and the water pump is used to allow water from the water tank to enter the urea tank through the solenoid valve to heat the urea, characterized in that, include: The first determining unit is used to determine whether the urea in the urea tank is in an ice-water mixture state; The second determining unit is used to determine a first target opening temperature when the urea is in the state of the ice-water mixture. The first target opening temperature is the sum of a first preset opening temperature and a first predetermined value. The first predetermined value is greater than 0. The first preset opening temperature is the preset temperature of the water in the water tank when the solenoid valve is opened. The first control unit is used to control the solenoid valve to open when the actual temperature of the water in the water tank reaches the first target opening temperature. The second control unit is configured to, when the solenoid valve is open, perform at least one of the following: control the engine speed to increase, control the engine gear to decrease, thereby increasing the speed of the water pump connected to the crankshaft, and increasing the water flow rate for heating the urea.

10. An electronic device, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a control method for performing the urea thawing heating method according to any one of claims 1 to 8.

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