Control method and device for solving urea nozzle crystallization blockage and electronic equipment

Abstract

The application discloses a control method and device for solving urea nozzle crystallization blockage and electronic equipment, the control method comprises the following steps: when the urea nozzle is blocked, acquiring the working condition of the current urea injection system; when the working condition meets the preset condition, the following steps are executed in a cycle: controlling the driving assembly to heat for a preset time length; judging whether the urea nozzle is blocked; when the urea nozzle is blocked, executing the step of controlling the driving assembly to heat for a preset time length until the blockage of the urea nozzle is eliminated. When it is detected that the urea nozzle is blocked, if the working condition of the urea injection system meets the preset condition at this time, the driving assembly is heated, thereby eliminating urea crystallization, and the urea crystallization is eliminated by controlling the structure of the urea nozzle itself, so that the heating efficiency is high, and cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile technology, and in particular to a control method and device for solving urea nozzle crystallization blockage and an electronic device. BACKGROUND

[0002] With the gradual improvement of emission regulations, the related technology of the automobile aftertreatment system is also becoming more and more perfect.

[0003] The urea nozzle of the urea injection system in the diesel engine aftertreatment system has the problem of urea crystallization under the combined action of the continuously changing exhaust gas temperature and the cooling of the coolant, which leads to nozzle blockage, affects the conversion efficiency of SCR, affects the engine emissions, easily leads to vehicle torque limitation, does not meet the requirements of the national standard, and affects the user experience.

[0004] At present, the main way to eliminate urea nozzle crystallization is to achieve it through active regeneration, but active regeneration will cause oil consumption to increase, and the problems of frequent regeneration, accelerated aging of the aftertreatment system, etc. SUMMARY

[0005] To solve at least one of the technical problems in the background art, the present application provides a control method, device and electronic device for solving urea nozzle crystallization blockage.

[0006] According to an aspect of an embodiment of the present application, a control method for solving urea nozzle crystallization blockage is provided, which is applied to a urea injection system, the urea nozzle includes a driving assembly, and the control method includes: when the urea nozzle is blocked, obtaining the working condition of the current urea injection system; when the working condition meets a preset condition, cyclically executing the following steps: controlling the driving assembly to heat for a preset time; determining whether the urea nozzle is blocked; when the urea nozzle is blocked, executing the step of controlling the driving assembly to heat for a preset time until the blockage of the urea nozzle is eliminated.

[0007] Optionally, the driving assembly includes an electromagnetic driving coil and a conductor, the electromagnetic driving coil is sleeved outside the conductor, one end of the conductor is in contact with the nozzle port of the urea nozzle, and the conductor can move in the electromagnetic driving coil, and the control method further includes: when the urea nozzle is blocked, controlling the electromagnetic driving coil to heat at a first frequency of alternating current; when the urea nozzle is not blocked, controlling the electromagnetic driving coil to work at a second frequency of alternating current, the first frequency being greater than the second frequency.

[0008] Optionally, the heating of the electromagnetic drive coil by the alternating current at the first frequency comprises: obtaining a temperature protection model; determining a current temperature value of the urea nozzle based on the temperature protection model; when the current temperature value is greater than a maximum temperature limit, controlling the first frequency to decrease.

[0009] Optionally, the determining of the current temperature value of the urea nozzle based on the temperature protection model comprises: obtaining a heating power of the electromagnetic drive coil, an exhaust temperature of an aftertreatment system, and a temperature of engine cooling water; determining the current temperature value of the urea nozzle based on the heating power, the exhaust temperature, the temperature of engine cooling water, and the temperature protection model.

[0010] Optionally, the urea injection system further comprises an alarm device, and the control method further comprises: obtaining a heating frequency of the control of the heating of the drive assembly for a preset time length; when the heating frequency is greater than a preset frequency, obtaining a state of the urea nozzle; when the urea nozzle is blocked, controlling the alarm device to issue an alarm.

[0011] Optionally, the preset condition comprises at least one of that the engine is in a running state, that the urea pump is in an inoperative state, and that a temperature of the urea tank is greater than a preset temperature.

[0012] Optionally, the determining that the urea nozzle is blocked comprises: controlling a pressure relief valve to open.

[0013] According to still another aspect of the embodiments of the present application, a control device for solving crystallization and blockage of a urea nozzle is provided, which is applied to a urea injection system, the urea injection system comprising a urea nozzle, the urea nozzle comprising a drive assembly, the control device comprising: an obtaining module, configured to obtain a working condition of the urea injection system when the urea nozzle is blocked; an analyzing module, configured to determine whether the working condition meets a preset condition; a first executing module, configured to control the drive assembly to heat for a preset time length when the working condition meets the preset condition; and a second executing module, configured to determine whether the urea nozzle is blocked, and control the drive assembly to heat for the preset time length when the urea nozzle is blocked.

[0014] According to still another aspect of the embodiments of the present application, an electronic device is provided, which comprises a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory complete communication with each other through the communication bus; the memory is configured to store a computer program; and the processor is configured to execute the method steps in any of the above embodiments by running the computer program stored in the memory.

[0015] According to still another aspect of the embodiments of the present application, a computer readable storage medium is provided, in which a computer program is stored, and the computer program is configured to execute the method steps of any of the above embodiments when running.

[0016] In the embodiments of the present application, when the urea nozzle is blocked, if the working condition of the urea injection system meets the preset condition, the crystallization removing step is started, and the driving assembly is controlled to heat for a preset time period during the crystallization removing, so as to avoid damage of the urea nozzle caused by overheat of the urea nozzle while ensuring the crystallization removing. After the crystallization removing by heating once, the state of the urea nozzle is detected again, if the urea nozzle is still in the crystallization state, the driving assembly is controlled to heat for a preset time period, and the crystallization of the urea nozzle is removed through the cyclic heating and detection, and the heating efficiency is high while the crystallization removing cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 is a flowchart of an optional control method for solving the urea nozzle crystallization blockage according to the embodiments of the present application;

[0020] Figure 2 is another flowchart of an optional control method for solving the urea nozzle crystallization blockage according to the embodiments of the present application;

[0021] Figure 3 is a structural block diagram of an optional control device for solving the urea nozzle crystallization blockage according to the embodiments of the present application;

[0022] Figure 4 is a structural block diagram of an optional electronic device according to the embodiments of the present application. DETAILED DESCRIPTION

[0023] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application, so that those skilled in the art can better understand the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] As described in the background, the urea nozzle of the urea injection system in the diesel engine aftertreatment system has the problem of urea crystallization under the combined action of the continuously changing exhaust gas temperature and the cooling of the coolant, which leads to nozzle blockage, affects the conversion efficiency of the selective catalytic reduction system (SCR system), affects the emission of the engine, easily leads to vehicle torque limitation, does not meet the requirements of the national standard, and affects the user experience. At present, the main way to eliminate urea nozzle crystallization is to realize it through active regeneration, but active regeneration will cause oil consumption to increase, and the aftertreatment system will accelerate aging and other problems.

[0026] Therefore, according to an aspect of an embodiment of the present application, a control method for solving urea nozzle crystallization and blockage is provided, as shown in Figure 1 The flow of the method can include the following steps:

[0027] S10. When urea nozzle blockage occurs, obtain the working condition of the current urea injection system.

[0028] S20. Determine whether the working condition meets the preset condition.

[0029] S30. Control the driving assembly to heat for a preset time length.

[0030] S40. Determine whether urea nozzle blockage occurs, and control the driving assembly to heat for a preset time length when urea nozzle blockage occurs.

[0031] In the embodiment, when the urea nozzle is blocked, if the working condition of the urea injection system meets the preset condition, the crystallization removal step is started, and the driving assembly is controlled to heat for a preset time period during the crystallization removal, so as to avoid damage to the urea nozzle caused by overheating of the urea nozzle while ensuring the crystallization removal. After the crystallization removal by heating once, the state of the urea nozzle is detected again, and if the urea nozzle is still in the crystallization state, the driving assembly is controlled to heat for a preset time period again. Through the cyclic heating and detection, the crystallization of the urea nozzle is eliminated, and the crystallization elimination is realized by using the driving assembly of the urea nozzle itself, so as to save the cost of crystallization removal while ensuring high heating efficiency. The preset time period can be set through experiments. The urea nozzle that has been blocked by crystallization is controlled on the test bench, the driving assembly is heated, and the different crystallization removal degrees of the urea nozzle corresponding to different heating time periods are recorded to form a two-dimensional table of heating time period and crystallization removal degree. The heating time period is selected as the preset time period in the table. The preset time period can be 1s, 2s, 3s, etc. Different settings can be made according to different models of urea nozzles.

[0032] As an exemplary embodiment, the driving assembly includes an electromagnetic driving coil and a conductor, the electromagnetic driving coil is sleeved outside the conductor, one end of the conductor is in contact with the nozzle port of the urea nozzle, and the conductor can move in the electromagnetic driving coil. The control method further includes: when the urea nozzle is blocked, the electromagnetic driving coil is controlled to heat by alternating current at a first frequency; and when the urea nozzle is not blocked, the electromagnetic driving coil is controlled to work by alternating current at a second frequency, the first frequency being greater than the second frequency.

[0033] In the embodiment, when the urea nozzle is not blocked, the opening and closing of the urea nozzle can be realized by controlling whether to supply power to the electromagnetic driving coil. Specifically, when the urea nozzle needs to be opened, current is supplied to the electromagnetic driving coil. At this time, due to the electromagnetic effect, the conductor moves in the electromagnetic driving coil, and the end of the conductor in contact with the nozzle port moves away from the nozzle port, so that the urea nozzle is opened and urea injection is realized. When the urea nozzle needs to be closed, power supply to the electromagnetic driving coil is stopped, the electromagnetic effect disappears, and the conductor moves to the position in contact with the nozzle port again, so that the urea nozzle is closed and urea injection is stopped.

[0034] When the urea nozzle is blocked, the elimination of crystallization also needs to supply power to the electromagnetic drive coil, and the electromagnetic drive coil is supplied with alternating current of the first frequency. When the outer circumference of the conductor does not change, the higher the frequency of the alternating current supplied, the greater the eddy current formed on the conductor, and the more heat generated. When the state of the urea nozzle is controlled, the first frequency is greater than the second frequency to realize the driving and heating functions of the electromagnetic drive coil. By controlling the different frequencies of the current supplied to the electromagnetic drive coil, the urea nozzle is eliminated of crystallization while ensuring the normal opening and closing functions of the urea nozzle, the heating efficiency is high, the control is simple, and no additional hardware is needed, saving costs. The first frequency can be 1 kHz.

[0035] As an exemplary embodiment, the heating of the electromagnetic drive coil by the alternating current of the first frequency includes: obtaining a temperature protection model; determining a current temperature value of the urea nozzle based on the temperature protection model; and when the current temperature value is greater than a maximum temperature limit, controlling the first frequency to decrease.

[0036] In this embodiment, when the crystallization is eliminated by the electromagnetic drive coil and the conductor in a heating manner, the current temperature value of the urea nozzle can be calculated by a temperature protection model, the heating power can be calculated by the actual current of the electromagnetic drive coil, and the temperature of the nozzle can be inversely calculated by the heating power, the current exhaust temperature, and the engine cooling water temperature. That is, a calculation formula for calculating the current temperature value of the urea nozzle can be fitted by the software through the current of the electromagnetic drive coil, the current exhaust temperature, and the engine cooling water temperature. The current, the current exhaust temperature, and the engine cooling water temperature can be obtained by real-time measurement. After the temperature protection model is fitted, the current actual temperature value of the urea nozzle can be calculated by obtaining the current of the electromagnetic drive coil, the current exhaust temperature, and the engine cooling water temperature of the vehicle. The current temperature value of the urea nozzle is calculated in real time, compared with the maximum temperature limit allowed for the operation of the urea nozzle, and then the size of the first frequency is controlled to control the heating temperature of the urea nozzle, realize the protection of the urea nozzle, and avoid damage to the urea nozzle caused by overheating of the urea nozzle.

[0037] As an exemplary embodiment, the determination of the current temperature value of the urea nozzle based on the temperature protection model includes: obtaining the heating power of the electromagnetic drive coil, the exhaust temperature of the aftertreatment system, and the engine cooling water temperature; and determining the current temperature value of the urea nozzle based on the heating power, the exhaust temperature, the engine cooling water temperature, and the temperature protection model.

[0038] In the embodiment, the heating power of the electromagnetic driving coil can be calculated by the actual current of the electromagnetic driving coil, and the current temperature value of the urea nozzle is calculated in combination with the exhaust temperature of the aftertreatment system and the cooling water temperature and temperature protection model of the engine. The frequency of the alternating current flowing into the electromagnetic driving coil is controlled through real-time detection of the current temperature value, and the temperature control of the urea nozzle is realized, thereby effectively protecting the urea nozzle and avoiding damage of the urea nozzle caused by excessive heating.

[0039] As an exemplary embodiment, the urea injection system further comprises an alarm device, and the control method further comprises: obtaining a heating frequency of controlling the driving assembly to heat for a preset time length; obtaining a state of the urea nozzle when the heating frequency is greater than a preset frequency; and controlling the alarm device to issue an alarm when the urea nozzle is blocked.

[0040] In the embodiment, the urea injection system further comprises an alarm device. When the number of times of controlling the driving assembly to heat the urea nozzle exceeds a preset number of times and the urea nozzle is still in a blocked state at this time, the urea nozzle is likely to be damaged. At this time, the alarm device is controlled to issue an alarm to remind the driver to repair in time.

[0041] As an exemplary embodiment, the preset condition comprises at least one of the engine being in an operating state, the urea pump being in an inoperative state, and the temperature of the urea tank being greater than a preset temperature. The preset temperature can be obtained by test calibration. Since the urea nozzle needs to be heated when the urea nozzle is de-crystallized, the urea nozzle is more conducive to heating and de-crystallization when the temperature value is higher than a certain temperature value, which reduces the time required for heating the urea nozzle to a temperature at which de-crystallization can be performed. The certain temperature value can be measured on a test bench. The time length of de-crystallization corresponding to the current vehicle model, the current SCR system model and the current urea nozzle model is selected, and the initial temperature value of the urea nozzle corresponding to the time length is searched as the preset temperature.

[0042] As an exemplary embodiment, the determination that the urea nozzle is blocked comprises: controlling the pressure relief valve to open.

[0043] In the embodiment, the current state of the urea nozzle needs to be detected after the driving assembly is controlled to heat once. When the state of the urea nozzle is detected, the pressure sensor arranged in the urea pump can detect different pressure values according to different opening time lengths of the urea nozzle. If the pressure value detected by the pressure sensor does not change or changes little when the urea nozzle is controlled to open, it is determined that the urea nozzle is still in a blocked state. Therefore, when it is determined that the urea nozzle is blocked, the pressure relief valve needs to be controlled to open to relieve pressure, which facilitates subsequent detection of the state of the urea nozzle.

[0044] According to another aspect of the embodiments of the present application, a control device for solving urea nozzle crystallization blockage is provided, which is applied to a urea injection system, the urea injection system comprising a urea nozzle, the urea nozzle comprising a driving assembly, as shown in Figure 3 The control device comprises:

[0045] The acquisition module 301 is configured to acquire a working condition of the urea injection system when the urea nozzle is blocked.

[0046] The analysis module 302 is configured to determine whether the working condition meets a preset condition.

[0047] The first execution module 303 is configured to control the driving assembly to heat for a preset time length when the working condition meets the preset condition.

[0048] The second execution module 304 is configured to determine whether the urea nozzle is blocked, and control the driving assembly to heat for a preset time length when the urea nozzle is blocked.

[0049] It should be noted that the acquisition module 301 in the embodiment can be configured to execute the above step S10, the analysis module 302 in the embodiment can be configured to execute the above step S20, the first execution module 303 in the embodiment can be configured to execute the above step S30, and the second execution module 304 in the embodiment can be configured to execute the above step S40.

[0050] According to another aspect of the embodiments of the present application, an electronic device is provided, which comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete communication with each other through the communication bus, the memory is configured to store a computer program, and the processor is configured to execute the control method for solving urea nozzle crystallization blockage according to any one of the above embodiments by running the computer program stored in the memory.

[0051] Figure 4 is a structural block diagram of an optional electronic device according to the embodiments of the present application, as shown in Figure 4 The electronic device comprises a processor 402, a communication interface 404, a memory 406 and a communication bus 408, wherein the processor 402, the communication interface 404 and the memory 406 complete communication with each other through the communication bus 408, and the memory 406 is configured to store a computer program.

[0052] The memory 406 is configured to store a computer program.

[0053] The processor 402 is configured to execute the computer program stored in the memory 406 to implement the following steps.

[0054] When the urea nozzle is blocked, the working condition of the current urea injection system is acquired;

[0055] When the working condition meets a preset condition, the following steps are executed cyclically:

[0056] The driving assembly is controlled to heat for a preset time length;

[0057] It is judged whether the urea nozzle is blocked;

[0058] When the urea nozzle is blocked, the step of controlling the driving assembly to heat for a preset time length is executed until the blockage of the urea nozzle is eliminated.

[0059] Optionally, in the embodiment, the communication bus can be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus or the like. The communication bus can be divided into an address bus, a data bus, a control bus and the like. For the convenience of representation, Figure 4 Only one thick line is used to represent the communication bus, but it does not mean that there is only one bus or only one type of bus.

[0060] The communication interface is used for communication between the electronic device and other devices.

[0061] The memory can include a RAM and can also include a non-volatile memory, for example, at least one disk memory. Optionally, the memory can also be at least one storage device located away from the aforementioned processor.

[0062] According to still another aspect of the embodiment of the application, a computer readable storage medium is provided, and the storage medium stores a computer program. The computer program is configured to execute the control method for solving the urea nozzle crystallization blockage when running.

[0063] Optionally, in the embodiment, the storage medium is configured to store program code for executing the following steps:

[0064] When the urea nozzle is blocked, the working condition of the current urea injection system is acquired;

[0065] When the working condition meets a preset condition, the following steps are executed cyclically:

[0066] The driving assembly is controlled to heat for a preset time length;

[0067] It is judged whether the urea nozzle is blocked;

[0068] When the urea nozzle is blocked, the step of controlling the driving assembly to heat for a preset time period is performed until the blockage of the urea nozzle is eliminated.

[0069] Optionally, specific examples in the embodiment can refer to the examples described in the above embodiments, and the embodiment will not be described here.

[0070] Optionally, in the embodiment, the storage medium can include, but is not limited to, a U disk, a ROM, a RAM, a mobile hard disk, a magnetic disk or an optical disk, and various storage program codes.

[0071] The serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0072] It should be noted that, for the foregoing method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited to the action sequence described, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0073] The above is only the preferred embodiment of the present application, and it should be pointed out that, for those skilled in the art, without departing from the principle of the present application, some improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A control method for solving crystallization clogging of a urea nozzle, characterized by, The application is applied to a urea injection system, and the urea nozzle comprises a driving assembly, and the control method comprises the following steps: When the urea nozzle is blocked, the working condition of the current urea injection system is obtained; When the working condition meets the preset condition, the following steps are executed cyclically: The driving assembly is heated for a preset time length; It is judged whether the urea nozzle is blocked or not; When the urea nozzle is blocked, the step of heating the driving assembly for a preset time length is executed until the blockage of the urea nozzle is eliminated; The driving assembly comprises an electromagnetic driving coil and a conductor, the electromagnetic driving coil is sleeved outside the conductor, one end of the conductor is in contact with the nozzle port of the urea nozzle, and the conductor can move in the electromagnetic driving coil, and the control method further comprises the following steps: When the urea nozzle is blocked, the electromagnetic driving coil is heated by alternating current with a first frequency; When the urea nozzle is not blocked, the electromagnetic driving coil is controlled to work by alternating current with a second frequency, and the first frequency is greater than the second frequency; The step of heating the electromagnetic driving coil by alternating current with the first frequency comprises the following steps: A temperature protection model is obtained; The current temperature value of the urea nozzle is determined based on the temperature protection model; When the current temperature value is greater than the maximum temperature limit value, the first frequency is controlled to decrease; The step of determining the current temperature value of the urea nozzle based on the temperature protection model comprises the following steps: The heating power of the electromagnetic driving coil, the exhaust temperature of the aftertreatment system and the engine cooling water temperature are obtained; The current temperature value of the urea nozzle is determined based on the heating power, the exhaust temperature, the engine cooling water temperature and the temperature protection model.

2. The control method of solving the urea nozzle crystallization clogging according to claim 1, characterized by, The urea injection system further comprises an alarm device, and the control method further comprises the following steps: The heating frequency of heating the driving assembly for a preset time length is obtained; When the heating frequency is greater than a preset frequency, the state of the urea nozzle is obtained; When the urea nozzle is blocked, the alarm device is controlled to give an alarm.

3. The control method of solving the urea nozzle crystallization clogging according to claim 1, characterized by, The preset condition comprises at least one of the following conditions: the engine is in a running state, the urea pump is in a non-working state, and the temperature of the urea tank is greater than a preset temperature.

4. The control method of solving the urea nozzle crystallization clogging according to claim 1, characterized by, When it is determined that the urea nozzle is blocked, the following step is further included: The pressure relief valve is controlled to open.

5. A control device for solving crystallization clogging of a urea nozzle, characterized by, The control device is applied to the control method for solving the crystallization blockage of the urea nozzle according to any one of claims 1-4, and the control device comprises: An acquisition module is configured to obtain the working condition of the current urea injection system when the urea nozzle is blocked; An analysis module is configured to judge whether the working condition meets the preset condition; A first execution module is configured to control the driving assembly to heat for a preset time length when the working condition meets the preset condition; A second execution module is configured to judge whether the urea nozzle is blocked or not, and control the driving assembly to heat for a preset time length when the urea nozzle is blocked.

6. An electronic device comprising a processor, a communication interface, a memory and a communication bus, wherein, The processor, the communication interface and the memory complete the communication among each other through the communication bus, and the memory is configured to store a computer program. ​ The processor is configured to execute the control method for solving urea nozzle crystallization blockage according to any one of claims 1-4 by running the computer program stored on the memory.

7. A computer readable storage medium, characterized in that, The storage medium stores a computer program, and the computer program is configured to execute the control method for solving urea nozzle crystallization blockage according to any one of claims 1-4 when running.

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