Urea nozzle fault detection method, device, storage medium and vehicle

Abstract

The present invention specifically relates to a method, device, storage medium and vehicle for detecting a urea nozzle failure. The method for detecting a urea nozzle failure includes obtaining a post-processing temperature based on the vehicle's excessive nitrogen oxide emissions during driving. Based on the post-processing temperature being less than a preset temperature, the urea nozzle is closed, and the vehicle's system stabilization time is obtained. Based on the system stabilization time being greater than a first preset time, the opening of the urea nozzle is adjusted to a preset opening, and the pressure drop rate of the urea pump is obtained. Based on the pressure drop rate being less than a preset value, it is determined that the urea nozzle is clogged. The method for detecting a urea nozzle failure of the present invention can promptly and effectively detect whether the urea nozzle is clogged when the vehicle is driving and the engine's nitrogen oxide emissions exceed the standard, thereby solving the current problem of being unable to diagnose the urea nozzle when the vehicle is driving and the nitrogen oxide emissions exceed the standard.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicles, and in particular relates to a method, a device, a storage medium and a vehicle for detecting a urea nozzle failure. Background Art

[0002] The harmful substances in the exhaust gas emitted by diesel vehicles are mainly nitrogen oxides and particulates. In order to reduce the emission of nitrogen oxides, the exhaust gas emitted by diesel vehicles will first be treated by exhaust gas treatment devices before being discharged into the air. At present, most exhaust gas treatment devices will accurately and quantitatively inject high-pressure urea solution into the exhaust pipe to react with NO in the exhaust gas. x React to generate N2 and H2O, thereby reducing NO in the exhaust gas discharged by the engine x Among them, the accuracy of urea solution injection is the key factor affecting NO in automobile exhaust. x important factor in emissions.

[0003] Urea injectors are key components of diesel engine aftertreatment systems during the emissions phase, significantly impacting engine emissions and crystallization in the aftertreatment system. In actual use, impurities in urea can cause urea injectors to become clogged. This can reduce urea injection volume, preventing exhaust gases from fully reacting with urea, and leading to excessive emissions.

[0004] However, the current diagnostic strategy is only applicable to after-sales maintenance, when the vehicle enters the repair station and the urea nozzle is removed from the original installation position for inspection. It is impossible to accurately determine whether the urea nozzle is blocked when the vehicle is driving and emissions exceed the standard. Summary of the Invention

[0005] The purpose of the present invention is to at least solve the current problem of being unable to diagnose urea nozzles while a vehicle is in motion and nitrogen oxide emissions exceed the standard. This purpose is achieved through the following technical solutions:

[0006] A first aspect of the present invention provides a method for detecting a urea nozzle failure, which is characterized by comprising:

[0007] According to the excessive nitrogen oxide emissions during driving of the vehicle, the post-processing temperature is obtained;

[0008] According to the after-treatment temperature being lower than a preset temperature, closing the urea nozzle and obtaining a system stabilization time of the vehicle;

[0009] According to the system stabilization time being greater than the first preset time, adjusting the opening of the urea nozzle to a preset opening, and obtaining a pressure drop rate of the urea pump;

[0010] According to the pressure drop rate being less than a preset value, it is determined that the urea nozzle is clogged.

[0011] The present invention provides a method for detecting urea nozzle failure. When a vehicle is driving and nitrogen oxide emissions exceed the standard, the method performs a preliminary test for excessive nitrogen oxide emissions by measuring the post-processing temperature. The method then calculates the pressure drop rate of the urea pump by sequentially closing and opening the urea nozzle at a preset opening. This pressure drop rate is then compared with a preset value to determine whether a urea nozzle blockage exists. This method allows for timely and effective detection of urea nozzle blockage when the vehicle is driving and engine nitrogen oxide emissions exceed the standard, thereby resolving the current problem of being unable to diagnose urea nozzles while the vehicle is driving and nitrogen oxide emissions exceed the standard.

[0012] In addition, the urea nozzle failure detection device according to the present invention may also have the following additional technical features:

[0013] In some embodiments of the present invention, before the step of obtaining the post-processing temperature based on the excessive nitrogen oxide emissions of the vehicle during driving, the step further includes:

[0014] Obtaining operating data of the vehicle and nitrogen oxide emissions from the engine;

[0015] determining that the vehicle is in a driving state according to the operating data of the vehicle meeting the driving requirements;

[0016] According to the nitrogen oxide emission of the engine exceeding the standard value, it is determined that the nitrogen oxide emission of the vehicle during driving exceeds the standard.

[0017] In some embodiments of the present invention, the step of closing the urea nozzle according to the after-treatment temperature being less than a preset temperature and obtaining the system stabilization time of the vehicle includes:

[0018] According to the completion of the urea nozzle closing action, the pressure value of the urea pump is obtained in real time;

[0019] Determining whether the pressure value meets a first preset requirement;

[0020] According to the pressure value always meeting the first preset requirement and the urea pump operating at a constant urea pump duty cycle, a first monitoring time is acquired, and the first monitoring time is determined as the system stabilization time.

[0021] In some embodiments of the present invention, the pressure value meeting the first preset requirement includes:

[0022] The pressure value does not exceed a first upper limit and is not lower than a first lower limit, wherein the first upper limit is greater than the first lower limit.

[0023] In some embodiments of the present invention, the step of adjusting the opening of the urea nozzle to a preset opening according to the system stabilization time being greater than the first preset time and obtaining the pressure drop rate of the urea pump includes:

[0024] turning on the urea nozzle and, when the opening of the urea nozzle is adjusted to a preset opening, starting timing to obtain a second monitoring time;

[0025] According to the second monitoring time reaching a second preset time, a pressure drop rate of the urea pump within the second preset time is determined.

[0026] In some embodiments of the present invention, further comprising:

[0027] After determining that the urea nozzle is clogged, issuing a fault prompt indicating that the urea nozzle is clogged;

[0028] Alternatively, based on the pressure drop rate being not less than a preset value, a fault prompt indicating that the emission exceeds the standard and a prompt indicating that the urea nozzle is normal are issued.

[0029] A second aspect of the present invention further provides a urea nozzle failure detection device for implementing the urea nozzle failure detection method of the present invention, which is characterized by comprising:

[0030] An acquisition module, used to obtain the aftertreatment temperature, the vehicle's system stabilization time, and the pressure drop rate of the urea pump;

[0031] a determination module, configured to determine whether the post-processing temperature is less than a preset temperature, whether the system stabilization time is greater than a first preset time, and whether the urea nozzle is clogged;

[0032] The control module is used to close or open the urea nozzle and can adjust the opening of the urea nozzle.

[0033] In some embodiments of the present invention, the acquisition module includes:

[0034] a detection unit, configured to detect the post-processing temperature and the pressure value of the urea pump;

[0035] Timing unit;

[0036] A judging unit, configured to judge and obtain the system stabilization time;

[0037] A calculation unit is used to calculate the pressure drop rate.

[0038] The third aspect of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the method for detecting a urea nozzle failure of the present invention is implemented.

[0039] A fourth aspect of the present invention further provides a vehicle, comprising the device for detecting a urea nozzle failure according to the present invention. The device for detecting a urea nozzle failure is applied to a urea supply system in the vehicle, wherein the urea supply system comprises a urea pump, and the urea pump injects urea at a target pressure through the urea nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings:

[0041] Figure 1 Schematic diagram of a flow chart of a method for detecting a urea nozzle failure according to an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the process before obtaining the post-processing temperature according to an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of a process for obtaining the system stabilization time of a vehicle according to an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of a process for obtaining the pressure drop rate of a urea pump according to an embodiment of the present invention;

[0045] Figure 5 This is a logic diagram of a method for detecting a urea nozzle failure according to an embodiment of the present invention;

[0046] Figure 6 Schematic diagram of the structure of a urea nozzle failure detection device according to an embodiment of the present invention;

[0047] Figure 7 This is a schematic structural diagram of an acquisition unit according to an embodiment of the present invention;

[0048] Figure 8 This is a schematic diagram of a structure of a device for detecting urea nozzle failure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0050] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0051] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0052] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0053] like Figure 1 As shown, according to an embodiment of the present invention, a method for detecting a urea nozzle failure is proposed, comprising:

[0054] According to the excessive nitrogen oxide emissions during driving of the vehicle, the post-processing temperature is obtained;

[0055] When the aftertreatment temperature is lower than the preset temperature, the urea nozzle is closed and the vehicle system stabilization time is obtained;

[0056] According to the system stabilization time being greater than the first preset time, adjusting the opening of the urea nozzle to a preset opening, and obtaining the pressure drop rate of the urea pump;

[0057] When the pressure drop rate is less than the preset value, it is determined that the urea nozzle is clogged.

[0058] The urea nozzle fault detection method of this embodiment performs a preliminary test for excessive nitrogen oxide emissions by measuring the post-processing temperature while the vehicle is in motion and experiencing excessive nitrogen oxide emissions. The method then calculates the pressure drop rate of the urea pump by sequentially closing and opening the urea nozzle at a preset opening. This pressure drop rate is then compared with a preset value to determine whether the urea nozzle is clogged. This method allows for timely and effective detection of urea nozzle clogs when the vehicle is in motion and engine nitrogen oxide emissions exceed standards, addressing the current difficulty in diagnosing urea nozzles while the vehicle is in motion and nitrogen oxide emissions exceed standards.

[0059] Specifically, first, it is determined that the vehicle is in the process of driving and the nitrogen oxide emission of the engine exceeds the standard, and then the post-processing temperature T is detected and compared with the preset temperature T. 设Since the existing post-processing system is provided with an exhaust temperature sensor for measuring the exhaust temperature at different positions on the catalyst, in this embodiment, the data detected by the exhaust temperature sensor can be regarded as the post-processing temperature T. At the same time, the preset temperature T 设 When the post-treatment temperature T is less than 400°C, the urea nozzle is closed to stop injecting urea. After the system is stabilized, and the system stabilization time t0 exceeds the first preset time t 设 When the urea nozzle is opened and the preset opening is maintained, the urea injection is performed at the set urea injection amount. At this time, the pressure value V in the urea pump will drop. If the pressure drop rate ΔV of the urea pump is less than the preset value ΔV 设 , it can be determined that the urea nozzle is clogged.

[0060] In some embodiments of the present invention, before the step of obtaining the post-processing temperature based on the nitrogen oxide emissions exceeding the standard during driving of the vehicle, the step further includes:

[0061] Obtain vehicle operating data and engine nitrogen oxide emissions;

[0062] According to the vehicle's operating data, the vehicle meets the driving requirements and determines that the vehicle is in a driving state;

[0063] Based on the fact that the engine's nitrogen oxide emissions exceed the standard value, it is determined that the vehicle's nitrogen oxide emissions exceed the standard during driving.

[0064] Specifically, before obtaining the post-processing temperature T, it is necessary to first determine whether the vehicle is in a driving state and whether the nitrogen oxide emissions of the vehicle's engine exceed the standard. Figure 2 As shown, in this embodiment, the need to obtain the after-treatment temperature T can be determined by obtaining the vehicle's operating data and the engine's nitrogen oxide emissions C. The vehicle's operating data can be the engine speed, vehicle speed, or engine pressure change, etc. When all or part of the above operating data meet the driving requirements, it can be determined that the vehicle is in a driving state. Of course, the vehicle's operating data includes but is not limited to the above content, and any data that can be used to determine that the vehicle is in a driving state can be used. Moreover, the engine's nitrogen oxide emissions C can be detected by a nitrogen oxide sensor. The nitrogen oxide sensor is an existing product and a component of the vehicle's after-treatment system. Its detection data can be directly used. By comparing the detection data with the specified standard value, it can be determined whether the engine's nitrogen oxide emissions exceed the standard.

[0065] like Figure 3 As shown, the steps of closing the urea nozzle according to the after-treatment temperature being less than the preset temperature and obtaining the system stabilization time of the vehicle include:

[0066] According to the completion of the urea nozzle closing action, the pressure value of the urea pump is obtained in real time;

[0067] Determining whether the pressure value meets a first preset requirement;

[0068] According to the pressure value always meeting the first preset requirement and the urea pump operating at a constant urea pump duty cycle, a first monitoring time is obtained and determined as the system stabilization time.

[0069] In this embodiment, the vehicle's system stabilization time t is the time it takes for the system to stabilize after the urea nozzle is turned off. System stability can be determined by observing changes in the urea pump pressure. Specifically, after the urea nozzle is turned off, the urea pump will experience suction and backflow to maintain stable urea pump pressure. However, during this process, the urea pump pressure V will still fluctuate. When the urea pump pressure V remains within a certain range, the system is considered stable.

[0070] In actual use, after the urea nozzle is closed, the urea pump pressure value V is detected. When the urea pump pressure value V meets the first preset requirement, timing is started to obtain recorded time, and the time period that meets the following requirements is selected as the first monitoring time t1. The conditions for meeting the first monitoring time t1 are: the urea pump pressure value V meets the first preset limit and the urea pump operates at a constant urea pump duty cycle. In this case, the first monitoring time t1 is considered the system stabilization time t0. When the urea pump pressure is stable and urea is not being injected, the urea pump duty cycle can be constant because the backflow rate is constant, and the urea pump can operate at this constant duty cycle.

[0071] The above-mentioned pressure value meets the first preset requirement, which includes: the pressure value does not exceed a first upper limit value and is not lower than a first lower limit value, wherein the first upper limit value is greater than the first lower limit value.

[0072] Specifically, when the urea pump begins to build pressure, the urea nozzle is opened at 95%. After the pressure buildup is complete, the pressure in the urea pump reaches 9 bar. After the urea nozzle is closed, the pressure in the urea pump fluctuates around 9 bar. In this embodiment, 0.2 bar is used as the fluctuation value for detecting system stability, that is, 9.2 bar is used as the first upper limit V, and 8.8 bar is used as the second upper limit V. Therefore, when the pump pressure V of the urea pump is between [8.8 bar, 9.2 bar], the urea pump system is considered stable.

[0073] like Figure 4 As shown, the step of adjusting the opening of the urea nozzle to a preset opening according to the system stabilization time being greater than the first preset time and obtaining the pressure drop rate of the urea pump includes:

[0074] Turning on the urea nozzle and, when the opening of the urea nozzle is adjusted to a preset opening, starting timing to obtain a second monitoring time;

[0075] According to the second monitoring time reaching the second preset time, the pressure drop rate of the urea pump within the second preset time is determined.

[0076] Specifically, when the system is deemed stable and the system stabilization time t0 is greater than a first preset time tset, the urea nozzle is controlled to be opened. The first preset time tset is set to 10 seconds, meaning the urea nozzle is opened when the system stabilization time t0 exceeds 10 seconds. In this embodiment, timing begins when the urea nozzle opening needs to be adjusted to a preset opening. The preset opening is 100%, so timing begins when the urea nozzle opening reaches 100%, and at this point, the timing duration is the second monitoring time t2.

[0077] In this embodiment, the second preset time t2 is set to 2S. When the second monitoring time t2 reaches 2S, the pressure drop rate ΔV is calculated according to the pressure value of the urea pump at this time. Then, the pressure drop rate calculated is compared with the preset value ΔV. 设 In this embodiment, the preset value is 0.5 bar / s. The preset value ΔV 设 The pressure drop rate is a fixed value that can be obtained through specific tests. When the pressure drop rate is less than 0.5 bar / s, it can be determined that the urea nozzle is clogged. When the pressure drop rate is greater than or equal to 0.5 bar / s, it can be determined that the urea nozzle is normal.

[0078] In some embodiments of the present invention, further comprising:

[0079] After confirming that the urea nozzle is clogged, a fault prompt indicating that the urea nozzle is clogged is issued;

[0080] Or, based on the pressure drop rate being no less than a preset value, a fault prompt indicating that emissions exceed the standard and a prompt indicating that the urea nozzle is normal are issued.

[0081] Upon determining that the urea nozzle is clogged, a fault notification can be issued to the driver, prompting the user to perform repairs and providing guidance for service stations. Furthermore, if the pressure drop rate is no less than a preset value, the urea nozzle can be determined to be functioning normally, but the engine's nitrogen oxide emissions are exceeding standards. In this case, a fault notification can be issued to the driver, indicating excessive emissions and a warning that the urea nozzle is functioning properly. It should be noted that the fault notification can be displayed on an LCD or with an audible alarm. Due to the wide variety of existing fault notification methods and their maturity, they will not be detailed here.

[0082] like Figure 5As shown, in actual use, the above detection method first obtains the vehicle's operating data, then determines whether the vehicle is in a driving state, and if not, re-acquires the vehicle's operating data; if so, obtains the engine's nitrogen oxide emissions C, and if the nitrogen oxide emissions C do not exceed the standard value C 标 , re-obtain the engine's nitrogen oxide emissions C; if the nitrogen oxide emissions C exceed the standard value C 标 , obtain the post-processing temperature T.

[0083] When T≥preset temperature T 设 When T < preset temperature T 设 When the urea nozzle is closed, the pressure value V of the urea pump is obtained. Then, it is determined whether the pressure value V of the urea pump satisfies the first upper limit value V 上 ≥V≥first lower limit V 下 If not, re-acquire the pressure value V of the urea pump; if so, start timing and obtain the first monitoring time t1. Then, determine whether the first monitoring time t1 satisfies: t1>preset temperature t 设 If not, continue to obtain the first monitoring time T1; if so, open the urea nozzle and adjust the opening of the urea nozzle to a preset opening.

[0084] Next, the second monitoring time t2 is obtained. When the second monitoring time t2 satisfies t2=the second preset time t 设 ', calculate the pressure drop rate ΔV; if the above conditions are not met, continue to obtain the second monitoring time t2; finally, determine whether the pressure drop rate ΔV satisfies ΔV<ΔV 设 If the above conditions are met, then it can be determined that the urea nozzle is clogged; if the above conditions are not met, then it can be determined that the urea nozzle is normal.

[0085] A second aspect of the present invention provides a urea nozzle failure detection device for implementing the above-mentioned urea nozzle failure detection method. The detection device includes an acquisition module, a determination module, and a control module.

[0086] The acquisition module is used to obtain the post-treatment temperature, the vehicle's system stabilization time, and the pressure drop rate of the urea pump. The determination module is used to determine whether the post-treatment temperature is less than a preset temperature, whether the system stabilization time is greater than a first preset time, and whether the urea nozzle is clogged. The control module is used to close or open the urea nozzle and adjust the opening degree of the urea nozzle.

[0087] like Figure 6As shown, the acquisition module first obtains the post-processing temperature T, and then the determination module determines whether the post-processing temperature is less than a preset temperature based on the information transmitted by the acquisition module. If the post-processing temperature is less than the preset temperature, the control module operates to close the urea nozzle.

[0088] After the urea nozzle is shut off, the acquisition module begins to obtain the vehicle's system stabilization time. Subsequently, the determination module determines whether the system stabilization time exceeds a first preset time based on the information transmitted by the acquisition module. If the system stabilization time exceeds the first preset time, the control module receives the information transmitted by the determination module and, at this point, turns on the urea nozzle and adjusts its opening to a preset degree.

[0089] Then, after the urea nozzle is turned on and meets the above-mentioned opening requirements, the acquisition module starts to obtain the pressure drop rate of the urea pump. After the determination module receives the pressure drop rate transmitted by the acquisition module, it compares the pressure drop rate with the preset value to determine whether the urea nozzle is blocked.

[0090] In some embodiments of the present invention, the acquisition module includes a detection unit, a timing unit, a judgment unit, and a calculation unit. The detection unit is configured to detect the post-processing temperature and the pressure value of the urea pump. The judgment unit is configured to determine the system stabilization time. The calculation unit is configured to calculate the pressure drop rate.

[0091] Specifically, if Figure 7 As shown, the detection unit detects the post-processing temperature and transmits the detection result. After receiving information indicating that the urea nozzle has been closed, the detection unit also detects the pressure value of the urea pump. Based on the pressure value transmitted by the detection unit and the time recorded by the timing unit, the judgment unit determines whether the system stabilization time meets the requirements and then transmits its judgment result. The judgment unit can control the timing unit to start or stop by determining whether the pressure value meets the first preset requirement, thereby determining the system stabilization time. Of course, the judgment unit can also simultaneously determine whether the first monitoring time meets the system stabilization time requirements based on the pressure value transmitted by the detection unit and the time recorded by the timing unit.

[0092] The timing unit restarts timing after receiving the information that the urea nozzle is open and opened at a preset opening. Finally, the calculation unit calculates the pressure drop rate of the urea pump based on the information transmitted by the timing unit and the information transmitted by the detection unit.

[0093] like Figure 8 As shown, this embodiment provides a block diagram of an electronic device. The electronic device includes at least a processor and a memory.

[0094] The processor is used to control the overall operation of the electronic device to complete all or part of the steps in the above-mentioned method for detecting urea nozzle failure. The memory is used to store various types of data to support the operation of the electronic device. These data may include, for example, instructions for any application or method used to operate on the electronic device, as well as application-related data, such as contact data, messages sent and received, pictures, audio, video, etc. The memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory, electrically erasable programmable read-only memory, erasable programmable read-only memory, programmable read-only memory, read-only memory, magnetic memory, flash memory, magnetic disk or optical disk. In addition, the electronic device may also include other components such as multimedia components. Multimedia components may include screens and audio components. Since this technology is relatively mature, it will not be described in detail here.

[0095] In this embodiment, the electronic device may be implemented by one or more application-specific integrated circuits, digital signal processors, digital signal processing devices, programmable logic devices, field programmable gate arrays, controllers, microcontrollers, microprocessors or other electronic components to perform the above-mentioned urea nozzle fault detection method.

[0096] A third aspect of the present invention provides a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the steps of the aforementioned method for detecting a urea nozzle failure. For example, the computer-readable storage medium may be the aforementioned memory containing the program. The program may be executed by a processor of an electronic device to perform the aforementioned method for detecting a urea nozzle failure.

[0097] A fourth aspect of the present invention provides a vehicle including the above-mentioned urea nozzle failure detection device. The detection device is applied to a urea supply system in the vehicle, the urea supply system including a urea pump that injects urea at a target pressure through the urea nozzle.

[0098] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for detecting urea nozzle failure, characterized in that: include: According to the excessive nitrogen oxide emissions during driving of the vehicle, the post-processing temperature is obtained; According to the after-treatment temperature being lower than a preset temperature, closing the urea nozzle and obtaining a system stabilization time of the vehicle; According to the system stabilization time being greater than the first preset time, adjusting the opening of the urea nozzle to a preset opening, and obtaining a pressure drop rate of the urea pump; determining that the urea nozzle is clogged according to the pressure drop rate being less than a preset value; The step of closing the urea nozzle according to the post-processing temperature being lower than a preset temperature and obtaining the system stabilization time of the vehicle includes: According to the completion of the urea nozzle closing action, the pressure value of the urea pump is obtained in real time; Determining whether the pressure value meets a first preset requirement; According to the pressure value always meeting the first preset requirement and the urea pump operating at a constant urea pump duty cycle, obtaining a first monitoring time, and determining the first monitoring time as the system stabilization time; When the urea nozzle is closed, the urea pump itself will absorb liquid and reflux to maintain the pressure of the urea pump stable.

2. The method for detecting urea nozzle failure according to claim 1, characterized in that: Before the step of obtaining the post-processing temperature according to the excessive nitrogen oxide emissions during driving of the vehicle, the method further includes: Obtaining operating data of the vehicle and nitrogen oxide emissions from the engine; determining that the vehicle is in a driving state according to the operating data of the vehicle meeting the driving requirements; According to the nitrogen oxide emission of the engine exceeding the standard value, it is determined that the nitrogen oxide emission of the vehicle during driving exceeds the standard.

3. The method for detecting urea nozzle failure according to claim 1, characterized in that: The pressure value meeting the first preset requirement includes: The pressure value does not exceed a first upper limit and is not lower than a first lower limit, wherein the first upper limit is greater than the first lower limit.

4. The method for detecting urea nozzle failure according to claim 1, characterized in that: The step of adjusting the opening of the urea nozzle to a preset opening according to the system stabilization time being greater than the first preset time and obtaining the pressure drop rate of the urea pump includes: turning on the urea nozzle and, when the opening of the urea nozzle is adjusted to a preset opening, starting timing to obtain a second monitoring time; According to the second monitoring time reaching a second preset time, a pressure drop rate of the urea pump within the second preset time is determined.

5. The method for detecting urea nozzle failure according to claim 1, characterized in that: Also includes: After determining that the urea nozzle is clogged, issuing a fault prompt indicating that the urea nozzle is clogged; Alternatively, based on the pressure drop rate being not less than a preset value, a fault prompt indicating that the emission exceeds the standard and a prompt indicating that the urea nozzle is normal are issued.

6. A urea nozzle failure detection device, used to implement the urea nozzle failure detection method according to any one of claims 1 to 5, characterized in that: include: An acquisition module, used to obtain the aftertreatment temperature, the vehicle's system stabilization time, and the pressure drop rate of the urea pump; a determination module, configured to determine whether the post-processing temperature is less than a preset temperature, whether the system stabilization time is greater than a first preset time, and whether the urea nozzle is clogged; The control module is used to close or open the urea nozzle and can adjust the opening of the urea nozzle.

7. The urea nozzle failure detection device according to claim 6, characterized in that: The acquisition module includes: a detection unit, configured to detect the post-processing temperature and the pressure value of the urea pump; Timing unit; A judging unit, configured to judge and obtain the system stabilization time; A calculation unit is used to calculate the pressure drop rate.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for detecting urea nozzle failure according to any one of claims 1 to 5 is implemented.

9. A vehicle, characterized in that: The urea nozzle failure detection device according to claim 6 or 7 is applied to a urea supply system in a vehicle, wherein the urea supply system comprises a urea pump, and the urea pump injects urea at a target pressure through the urea nozzle.

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