A method, apparatus, and engine system for preventing urea nozzle crystallization

Abstract

The application discloses a method, device and engine system for preventing urea nozzle crystallization, the method comprising: obtaining an exhaust temperature of a vehicle engine and a current battery state of charge of a battery system; comparing the exhaust temperature with an aftertreatment crystallization temperature to obtain a comparison result; determining a current charge range of the battery system based on the current battery state of charge; and controlling a heating device and the engine to perform corresponding actions based on the comparison result and the current charge range. The application determines whether the exhaust temperature of the engine reaches the aftertreatment crystallization temperature, further determines the residual power state of the battery system based on the comparison result, and finally controls the heating state to start heating the aftertreatment device based on the residual power state of the battery system and the comparison result, thereby solving the technical problem that the urea nozzle of the engine is prone to crystallization and nozzle blockage, and achieving the technical effect that urea nozzle blockage can be effectively prevented with lower fuel consumption.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of engine control, in particular to a method and device for preventing urea nozzle crystallization and an engine system. BACKGROUND

[0002] In order to meet the increasingly stringent emission regulations, the selective catalytic reduction technology (SCR) has become the most effective means to solve the emission problem, as the mainstream technology route of diesel vehicle stage VI and non-road four-stage aftertreatment, urea injection solves the emission problem, and the urea crystallization problem is increasingly prominent, which has become an unavoidable problem in the current aftertreatment. SUMMARY

[0003] The embodiment of the present application provides a method and device for preventing urea nozzle crystallization and an engine system, which solves the technical problem of urea nozzle blockage caused by crystallization of the urea nozzle of the engine in the prior art.

[0004] The embodiment of the present application provides a method for preventing urea nozzle crystallization, which comprises the following steps:

[0005] Obtaining the exhaust temperature of the vehicle engine and the current battery state of charge of the battery system;

[0006] Comparing the exhaust temperature with the aftertreatment crystallization temperature to obtain a comparison result, wherein the aftertreatment crystallization temperature is a temperature range in which the urea nozzle crystallizes;

[0007] Determining the current charging range of the battery system based on the current battery state of charge;

[0008] Controlling the heating device and the engine to perform corresponding actions based on the comparison result and the current charging range.

[0009] Further, the step of controlling the heating device and the engine to perform corresponding actions based on the comparison result and the current charging range comprises the following steps:

[0010] If the comparison result is that the exhaust temperature is less than or equal to the aftertreatment crystallization temperature, and the current charging range is that the current battery state of charge is 0, the heating device is controlled to be inoperative, and the engine is controlled to work in a first state, i.e. the battery system is charged, wherein the first state is a state in which the engine works at a maximum rated power output.

[0011] Further, the step of controlling the heating device and the engine to perform corresponding actions based on the comparison result and the current charging range further comprises the following steps:

[0012] If the comparison result is that the exhaust temperature is less than or equal to the aftertreatment crystallization temperature, and the current state of charge range is that the current battery state of charge is greater than 0 and less than or equal to 1, the heating device is controlled to be turned on, and the engine is controlled to work in a second state for charging the battery system, wherein the second state is a state in which the engine works in an optimal fuel consumption region.

[0013] Further, the controlling the heating device and the engine to perform corresponding actions based on the comparison result and the current state of charge range further comprises:

[0014] If the comparison result is that the exhaust temperature is greater than the aftertreatment crystallization temperature, and the current state of charge range is that the current battery state of charge is equal to 1, the heating device is controlled to be turned off.

[0015] Further, the controlling the heating device and the engine to perform corresponding actions based on the comparison result and the current state of charge range further comprises:

[0016] If the comparison result is that the exhaust temperature is greater than the aftertreatment crystallization temperature, and the current state of charge range is that the current battery state of charge is greater than or equal to 0 and less than 1, the heating device is controlled to be turned off, and the engine is controlled to work in a second state for charging the battery system, wherein the second state is a state in which the engine works in an optimal fuel consumption region.

[0017] Further, after the engine charges the battery system in the first state, the method further comprises:

[0018] determining whether the current state of charge range is that the current battery state of charge is greater than 0 and less than or equal to 1;

[0019] If yes, the heating device is controlled to be turned on, and the engine is controlled to work in a second state for continuing to charge the battery system, wherein the second state is a state in which the engine works in an optimal fuel consumption region.

[0020] The embodiment of the present application also provides a device for preventing crystallization of a urea nozzle, the device comprising:

[0021] a data acquisition unit configured to acquire an exhaust temperature of a vehicle engine and a current battery state of charge of a battery system;

[0022] a first data processing unit configured to compare the exhaust temperature with an aftertreatment crystallization temperature to obtain a comparison result, wherein the aftertreatment crystallization temperature is a temperature range in which crystallization of a urea nozzle occurs;

[0023] a second data processing unit configured to determine a current state of charge range of the battery system based on the current battery state of charge;

[0024] a control unit configured to control the heating device and the engine to perform corresponding actions based on the comparison result and the current state of charge.

[0025] The application also provides an electronic control unit comprising the device for preventing urea nozzle crystallization according to any of the above embodiments.

[0026] The application also provides an engine system comprising the electronic control unit according to any of the above embodiments, and a post-treatment device provided with a heating device and a battery system.

[0027] The electronic control unit is electrically connected to the post-treatment device, and the battery system is electrically connected to the electronic control unit.

[0028] Further, the engine system further comprises an air filter, a supercharger, an intercooler, a cylinder and an exhaust tail pipe.

[0029] The air filter, the supercharger, the intercooler, the cylinder, the post-treatment device and the exhaust tail pipe are connected in sequence.

[0030] The application discloses a method, device and engine system for preventing urea nozzle crystallization. The method comprises obtaining the exhaust temperature of a vehicle engine and the current state of charge of a battery system; comparing the exhaust temperature with the post-treatment crystallization temperature to obtain a comparison result; determining the current state of charge of the battery system based on the current state of charge; and controlling the heating device and the engine to perform corresponding actions based on the comparison result and the current state of charge. The application determines whether the exhaust temperature of the engine reaches the post-treatment crystallization temperature, and further determines the remaining state of charge of the battery system based on the comparison result, and finally controls the heating state to start heating the post-treatment device based on the remaining state of charge of the battery system and the comparison result, thereby solving the technical problem of urea nozzle blockage caused by crystallization of the urea nozzle of the engine in the prior art, and achieving the technical effect of effectively preventing urea nozzle blockage with lower fuel consumption. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a flowchart of a method for preventing urea nozzle crystallization according to an embodiment of the application;

[0032] Figure 2 is a flowchart of another method for preventing urea nozzle crystallization according to an embodiment of the application;

[0033] Figure 3 is a structural diagram of a device for preventing urea nozzle crystallization according to an embodiment of the application;

[0034] Figure 4 is a structural diagram of an engine system provided by an embodiment of the present application. DETAILED DESCRIPTION

[0035] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended to be merely illustrative of the present application and not in limitation thereof. It should also be noted that, for the purpose of description, only the parts related to the present application are shown in the accompanying drawings rather than all the parts.

[0036] It should be noted that the terms “first”, “second”, and the like in the specification and claims of the present application and the accompanying drawings are used to distinguish different objects and are not intended to limit a specific order. The various embodiments of the present application can be executed independently, and the various embodiments of the present application can also be executed in combination with each other, and the present application does not specifically limit the execution of the embodiments.

[0037] Figure 1 is a flowchart of a method for preventing urea nozzle crystallization provided by an embodiment of the present application.

[0038] As shown in Figure 1 , the method for preventing urea nozzle crystallization specifically includes the following steps:

[0039] S101, obtaining an exhaust temperature of a vehicle engine and a current battery state of charge of a battery system.

[0040] Specifically, after the engine is powered on, the electronic control unit (ECU) of the vehicle obtains the exhaust temperature of the engine and the current state of charge (SOC) of the battery system in real time, and determines whether the heating device needs to be turned on to heat the aftertreatment device by using the obtained exhaust temperature and current state of charge.

[0041] S102, comparing the exhaust temperature with an aftertreatment crystallization temperature to obtain a comparison result, wherein the aftertreatment crystallization temperature is a temperature range in which the urea nozzle is prone to crystallization.

[0042] Specifically, the aftertreatment crystallization temperature is a temperature range in which the urea nozzle is prone to crystallization obtained through multiple tests. After obtaining the exhaust temperature of the engine, the exhaust temperature of the engine is compared with the aftertreatment crystallization temperature to obtain a corresponding comparison result. When the exhaust temperature is lower than the aftertreatment crystallization temperature, it indicates that the urea nozzle is prone to crystallization problems. When the exhaust temperature is higher than the aftertreatment crystallization temperature, it indicates that the temperature of the aftertreatment device in which the urea nozzle is located is relatively high, and the urea nozzle is not prone to crystallization problems.

[0043] S103, determining a current charging range of the battery system based on the current state of charge.

[0044] Specifically, after obtaining the comparison result of the exhaust temperature and the aftertreatment crystallization temperature, the electronic control unit further determines the remaining power of the battery system according to the current battery state of charge, so as to determine whether the heating device can be started based on the remaining power of the battery system.

[0045] S104, controlling the heating device and the engine to perform corresponding actions based on the comparison result and the current state of charge.

[0046] Specifically, after obtaining the comparison result of the exhaust temperature and the aftertreatment crystallization temperature, and the remaining power of the battery system, if the exhaust temperature is lower than the aftertreatment crystallization temperature, and the battery system contains the remaining power, the heating device is started to heat the aftertreatment device to avoid crystallization of the urea nozzle, and the engine is controlled to charge the battery system with a certain fuel consumption, that is, the heating of the aftertreatment device is satisfied, and the fuel consumption of the engine is controlled.

[0047] The present application determines whether the exhaust temperature of the engine reaches the aftertreatment crystallization temperature, and further determines the remaining power state of the battery system after obtaining the comparison result, and finally controls the heating state to heat the aftertreatment device based on the remaining power state of the battery system and the comparison result, which solves the technical problem of urea nozzle blockage caused by crystallization of the urea nozzle in the prior art, and achieves the technical effect of effectively preventing urea nozzle blockage with lower fuel consumption.

[0048] On the basis of the above technical solutions, Figure 2 is a flowchart of another method for preventing urea nozzle crystallization provided by an embodiment of the present application. As shown in Figure 2 S104 specifically includes:

[0049] S201, if the comparison result is that the exhaust temperature is less than or equal to the aftertreatment crystallization temperature, and the current state of charge is that the current battery state of charge SOC is 0, S202 is executed to control the heating device to be inoperative, and the engine is controlled to work in a first state to charge the battery system, wherein the first state is that the engine works in a state of maximum rated power output.

[0050] Specifically, if the comparison result is that the exhaust temperature is less than or equal to the aftertreatment crystallization temperature, it indicates that the urea nozzle is prone to crystallization at this time, and at this time, the remaining power of the battery system needs to be determined according to the current charge range. If the current charge range is that the current battery state of charge SOC is 0 at this time, it indicates that the power of the battery system is 0 at this time, and the heating device cannot be started at this time, and the engine needs to be controlled to charge the battery system so that the battery system has a certain power to start the heating device. In this case, since the power of the battery system is 0, the heating device needs to be started as soon as possible so that the heating device can be started in the shortest time, and therefore the engine needs to be controlled to work in a state of maximum rated power output to charge the battery system.

[0051] In the embodiment of the present application, the battery system is used to supply power to the heating device, instead of directly using the oil consumption of the engine to supply power to the heating system, which can effectively reduce the fuel consumption of the vehicle and achieve the purpose of saving energy.

[0052] On the basis of each of the above technical solutions, as shown in Figure 2 S104 further includes:

[0053] S203, if the comparison result is that the exhaust temperature is less than or equal to the aftertreatment crystallization temperature, and the current charge range is that the current battery state of charge is greater than 0 and less than or equal to 1, S204 is executed to control the heating device to start working, and the engine is controlled to work in a second state to charge the battery system, wherein the second state is a state in which the engine works in an optimal fuel consumption area.

[0054] Specifically, if the comparison result is that the exhaust temperature is less than or equal to the aftertreatment crystallization temperature, it indicates that the urea nozzle is prone to crystallization at this time, and at this time, the remaining power of the battery system needs to be determined according to the current charge range. If the current charge range is that the current battery state of charge SOC is 0 at this time, it indicates that the power of the battery system is 0 at this time, and the heating device cannot be started at this time, and the engine needs to be controlled to charge the battery system so that the battery system has a certain power to start the heating device. In this case, since the power of the battery system is 0, the heating device needs to be started as soon as possible so that the heating device can be started in the shortest time, and therefore the engine needs to be controlled to work in a state of maximum rated power output to charge the battery system.

[0055] Optionally, as shown in Figure 2 In S202, after the engine charges the battery system in the first state, the method for preventing the urea nozzle from crystallizing further includes:

[0056] S205, judging whether the current charge range is that the current battery state of charge is greater than 0 and less than or equal to 1; if yes, performing S204 to control the heating device to start working and control the engine to work in the second state for the battery system to continue charging, wherein the second state is that the engine works in the state of the optimal fuel consumption area.

[0057] Specifically, when the engine works in the state of the maximum rated power output to charge the battery system, at this time, the battery system has a certain amount of electricity, re-judging whether the current charge range is that the current battery state of charge SOC is in the state of 0 < SOC ≤ 1, if yes, starting the heating device to heat the aftertreatment device to prevent the urea nozzle from crystallizing, and at the same time, controlling the engine to work in the state of the optimal fuel consumption area to charge the battery system; if no, the engine continues to charge the battery system with the maximum rated power.

[0058] On the basis of the above technical solutions, as shown in Figure 2 S104 further includes:

[0059] S206, if the comparison result is that the exhaust temperature is greater than the aftertreatment crystallization temperature and the current charge range is that the current battery state of charge is equal to 1, performing S207 to control the heating device not to work.

[0060] Specifically, if the comparison result is that the exhaust temperature is greater than the aftertreatment crystallization temperature, it indicates that the temperature of the aftertreatment device in which the urea nozzle is located is high and is not prone to crystallization problems, at this time, the remaining electricity of the battery system needs to be judged according to the current charge range to determine whether the engine needs to charge the battery system. Specifically, if the current charge range is that the current battery state of charge SOC = 1, it indicates that the battery system is in a full charge state and does not need to be charged at this time, at this time, as long as the heating device is controlled to remain in the state of not starting and the engine is controlled to work in the second state, i.e., the state of the optimal fuel consumption area.

[0061] On the basis of the above technical solutions, as shown in Figure 2 S104 further includes:

[0062] S208, if the comparison result is that the exhaust temperature is greater than the aftertreatment crystallization temperature and the current charge range is that the current battery state of charge is greater than or equal to 0 and less than 1, performing S209 to control the heating device not to work and control the engine to work in the second state to charge the battery system, wherein the second state is that the engine works in the state of the optimal fuel consumption area.

[0063] Specifically, if the comparison result is that the exhaust temperature is greater than the aftertreatment crystallization temperature, it indicates that the temperature of the aftertreatment device where the urea nozzle is located is high, and crystallization is not prone to occur, so the heating device does not need to be controlled to be turned on. At this time, the remaining power of the battery system needs to be determined according to the current state of charge range, to determine whether the engine needs to charge the battery system. Specifically, if the current state of charge range is that the current battery state of charge SOC is in the state of 0≤SOC<1, it indicates that the battery system has remaining power at this time, but is not in a full power state, so the battery system is charged under the premise of ensuring that the engine works in the best fuel consumption zone.

[0064] In the embodiment of the present application, the heating device in the aftertreatment device is controlled by judging the exhaust temperature of the engine and the remaining power of the battery system, and at the same time, the operating condition of the engine is adjusted to work in the first state or the second state, which not only effectively prevents the urea nozzle from crystallizing, but also saves energy consumption.

[0065] Figure 3 is a structure diagram of a device for preventing urea nozzle crystallization provided by the embodiment of the present application.

[0066] As shown in Figure 3 , the device for preventing urea nozzle crystallization specifically comprises:

[0067] a data acquisition unit 31 for acquiring the exhaust temperature of the vehicle engine and the current battery state of charge of the battery system;

[0068] a first data processing unit 32 for comparing the exhaust temperature with the aftertreatment crystallization temperature to obtain a comparison result, wherein the aftertreatment crystallization temperature is the temperature range at which the urea nozzle crystallizes;

[0069] a second data processing unit 33 for determining the current state of charge range of the battery system based on the current battery state of charge;

[0070] a control unit 34 for controlling the heating device and the engine to perform corresponding actions based on the comparison result and the current state of charge range.

[0071] Optionally, the control unit 34 is specifically configured to:

[0072] If the comparison result is that the exhaust temperature is less than or equal to the aftertreatment crystallization temperature, and the current state of charge range is that the current battery state of charge is 0, the control unit controls the heating device not to work, and controls the engine to work in the first state to charge the battery system, wherein the first state is a state in which the engine works at a maximum rated power output.

[0073] Optionally, the control unit 34 is further configured to:

[0074] If the comparison result is that the exhaust gas temperature is less than or equal to the aftertreatment crystallization temperature, and the current state of charge range is that the current state of charge is greater than 0 and less than or equal to 1, the heating device is controlled to be turned on, and the engine is controlled to work in a second state for charging the battery system, wherein the second state is a state in which the engine works in an optimal fuel consumption region.

[0075] Optionally, the control unit 34 is further configured to:

[0076] If the comparison result is that the exhaust gas temperature is greater than the aftertreatment crystallization temperature, and the current state of charge range is that the current state of charge is equal to 1, the heating device is controlled to be turned off.

[0077] Optionally, the control unit 34 is further configured to:

[0078] If the comparison result is that the exhaust gas temperature is greater than the aftertreatment crystallization temperature, and the current state of charge range is that the current state of charge is greater than or equal to 0 and less than 1, the heating device is controlled to be turned off, and the engine is controlled to work in a second state for charging the battery system, wherein the second state is a state in which the engine works in an optimal fuel consumption region.

[0079] Optionally, after the control unit 34 controls the engine to work in a first state for charging the battery system, the control unit 34 is further configured to:

[0080] determine whether the current state of charge range is that the current state of charge is greater than 0 and less than or equal to 1;

[0081] If yes, the heating device is controlled to be turned on, and the engine is controlled to work in a second state for continuing to charge the battery system, wherein the second state is a state in which the engine works in an optimal fuel consumption region.

[0082] The device for preventing urea nozzle crystallization provided by the embodiment of the present application can execute the method for preventing urea nozzle crystallization provided by any embodiment of the present application, and has the corresponding function modules and beneficial effects of executing the method.

[0083] The embodiment of the present application further provides an electronic control unit, which comprises the device for preventing urea nozzle crystallization in any of the above embodiments.

[0084] The electronic control unit provided by the embodiment of the present application comprises the device for preventing urea nozzle crystallization in the above embodiments, and therefore the electronic control unit provided by the embodiment of the present application also has the beneficial effects described in the above embodiments, which will not be described herein again.

[0085] Figure 4 is a structural diagram of an engine system provided by the embodiment of the present application.

[0086] As Figure 4As shown, the engine system comprises the electronic control unit 41 in any of the above embodiments, and further comprises a post-treatment device 42 provided with a heating device 421 and a battery system 43;

[0087] The electronic control unit 41 is electrically connected with the post-treatment device 42, and the battery system 43 is electrically connected with the electronic control unit 41.

[0088] Optionally, as Figure 4 As shown, the engine system further comprises an air filter 44, a supercharger 45, an intercooler 46, a cylinder 47 and an exhaust tail pipe 48.

[0089] The air filter 44, the supercharger 45, the intercooler 46, the cylinder 47, the post-treatment device 42 and the exhaust tail pipe 48 are connected in sequence.

[0090] Specifically, as Figure 4 As shown, air passes through the filtration of the air filter 44, the supercharging of the supercharger 45 and the cooling of the intercooler 46 to enter the cylinder 47 of the engine, and then is discharged from the exhaust end of the engine, the discharged exhaust gas containing harmful gas NOx, the exhaust gas passing through the exhaust pipe and entering the post-treatment device 42, a certain amount of urea water solution in the form of mist being sprayed into the post-treatment device 42 by the urea injection unit installed in the post-treatment device 42, the urea water solution being evaporated and decomposed to generate ammonia gas in the post-treatment device 42, and finally being discharged through the exhaust tail pipe 48.

[0091] When the temperature is low, the urea decomposition process produces by-products such as cyanuric acid and melamine, which are deposited in the post-treatment device 42 together with the undecomposed urea to form crystals, block the exhaust pipe and the catalyst carrier, increase the exhaust back pressure, and thus cause the emission to exceed the standard and even cause the engine to fail, so the electronic control unit 41 needs to collect the exhaust temperature of the engine and the current battery state of charge of the battery system in real time, and then control the heating device 421 to heat the post-treatment device 42 by using the method for preventing the crystallization of the urea nozzle in the above embodiments of the application to prevent the crystallization of the urea nozzle.

[0092] The engine system provided by the embodiments of the application comprises the electronic control unit in the above embodiments, so the engine system provided by the embodiments of the application also has the beneficial effects described in the above embodiments, which will not be described here.

[0093] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the terms “mounting”, “connection” and “linking” should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0094] Finally, it should be noted that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for preventing urea nozzle crystallization, characterized in that, The method includes: Obtain the exhaust temperature of the vehicle's engine and the current state of charge of the battery system; The exhaust temperature is compared with the post-treatment crystallization temperature to obtain the comparison result, wherein the post-treatment crystallization temperature is the temperature range in which crystals appear in the urea nozzle; The current charge range of the battery system is determined based on the current state of battery charge. Based on the comparison results and the current charge range, the heating device and engine are controlled to perform corresponding actions. The actions performed by the heating device and the engine based on the comparison results and the current charge range include: If the comparison result is that the exhaust temperature is less than or equal to the post-processing crystallization temperature, and the current charge range is that the current battery state of charge is 0, then the heating device is controlled to not work, and the engine is controlled to work in the first state to charge the battery system, wherein the first state is the state in which the engine works at maximum rated power output. If the comparison result is that the exhaust temperature is less than or equal to the post-treatment crystallization temperature, and the current charge range is that the current battery state of charge is greater than 0 and less than or equal to 1, then the heating device is controlled to start working, and the engine is controlled to work in the second state to charge the battery system, wherein the second state is the state in which the engine works in the optimal fuel consumption zone. The method further includes, after the engine charges the battery system in the first state, determining whether the current charge range is greater than 0 and less than or equal to 1; if so, controlling the heating device to start working and controlling the engine to work in the second state to continue charging the battery system.

2. The method for preventing urea nozzle crystallization according to claim 1, characterized in that, Based on the comparison results and the current charge range, controlling the heating device and engine to perform corresponding actions also includes: If the comparison result indicates that the exhaust temperature is greater than the post-processing crystallization temperature, and the current charge range is the current battery state of charge equal to 1, then the heating device is controlled to not work.

3. The method for preventing urea nozzle crystallization according to claim 1, characterized in that, Based on the comparison results and the current charge range, controlling the heating device and engine to perform corresponding actions also includes: If the comparison result is that the exhaust temperature is greater than the post-treatment crystallization temperature, and the current charge range is that the current battery state of charge is greater than or equal to 0 and less than 1, then the heating device is controlled to not work, and the engine is controlled to work in the second state to charge the battery system.

4. An apparatus for preventing urea nozzle crystallization during the execution of the method according to any one of claims 1-3, characterized in that, The device includes: The data acquisition unit is used to obtain the exhaust temperature of the vehicle engine and the current state of charge of the battery system. The first data processing unit is used to compare the exhaust temperature with the post-treatment crystallization temperature to obtain a comparison result, wherein the post-treatment crystallization temperature is the temperature range in which crystals appear in the urea nozzle; The second data processing unit is used to determine the current charge range of the battery system based on the current battery state of charge. The control unit is used to control the heating device and the engine to perform corresponding actions based on the comparison results and the current charge range.

5. An electronic control unit, characterized in that, The electronic control unit includes the device for preventing urea nozzle crystallization as described in claim 4.

6. An engine system, characterized in that, The engine system includes the electronic control unit as described in claim 5, and further includes an after-processor equipped with a heating device and a battery system; The electronic control unit is electrically connected to the post-processor, and the battery system is electrically connected to the electronic control unit.

7. The engine system according to claim 6, characterized in that, The engine system also includes an air filter, turbocharger, intercooler, cylinders, and exhaust tailpipe; The air filter, the turbocharger, the intercooler, the cylinder, the aftertreatment unit, and the exhaust tailpipe are connected in sequence.

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