Method, system, storage medium and vehicle for re-opening urea nozzle

Abstract

The present invention provides a method, system, storage medium and vehicle for re-opening a urea nozzle, the method comprising: obtaining the fluctuation of the working pressure of a urea pump, the current waveform of the urea nozzle and the nitrogen oxide conversion rate of the exhaust system; when the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, according to the current waveform and the nitrogen oxide conversion rate, driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, and / or driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature, so as to re-open the urea nozzle; wherein the working pressure fluctuation characteristic curve is a trend curve characterizing the change of the working pressure with the injection flow rate of the urea nozzle. The present invention realizes the automation of the whole process from fault discovery to fault elimination, and the autonomy of unblocking blockage, reducing the time and labor cost required for fault repair.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method, system, storage medium and vehicle for re-opening a urea nozzle. Background Art

[0002] Urea has strong reducing properties and is used to reduce nitrogen oxides in exhaust gas during the selective catalytic reduction stage of vehicle exhaust post-treatment. During the selective catalytic reduction stage, urea is sprayed into the selective catalytic reducer through a urea nozzle to reduce nitrogen oxides. Urea nozzles are prone to clogging during use. The main reasons for clogging are urea crystal clogging and exhaust gas combustion product clogging. In the prior art, when a urea nozzle is clogged, it is not possible to automatically take corresponding unclogging measures according to different clogging causes, and human intervention is required. Summary of the invention

[0003] Based on this, the present application provides a method, system, storage medium and vehicle for rerouting a urea nozzle.

[0004] A first aspect of an embodiment of the present invention provides a method for rerouting a urea nozzle, wherein the urea nozzle is provided with a first heating device, and the exhaust system is provided with a second heating device, comprising:

[0005] Obtaining fluctuations in the working pressure of the urea pump, the current waveform of the urea nozzle, and the nitrogen oxide conversion rate of the exhaust system;

[0006] When the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, according to the current waveform and the nitrogen oxide conversion rate, the first heating device is driven to heat the temperature of the urea nozzle solenoid valve to a first target temperature, and / or the second heating device is driven to heat the exhaust temperature of the exhaust system to a second target temperature, so as to reopen the urea nozzle;

[0007] The working pressure fluctuation characteristic curve is a trend curve representing the change of the working pressure with the injection flow rate of the urea nozzle.

[0008] Optionally, according to the current waveform and the nitrogen oxide conversion rate, driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, and / or driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature includes:

[0009] When the current waveform does not conform to the current waveform characteristic curve, driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature;

[0010] When the current waveform conforms to the current waveform characteristic curve, driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature according to the nitrogen oxide conversion rate;

[0011] The current waveform characteristic curve is a curve representing a trend of a current value of the urea nozzle changing with an injection flow rate of the urea nozzle.

[0012] Optionally, according to the nitrogen oxide conversion rate, driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature includes:

[0013] If the nitrogen oxide conversion rate is less than or equal to the preset conversion rate, driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature;

[0014] If the nitrogen oxide conversion rate is greater than the preset conversion rate, a prompt message indicating that the working pressure of the urea pump is abnormal is sent.

[0015] Optionally, the first heating device is a solenoid valve coil surrounding the urea nozzle, and driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature includes:

[0016] Power is supplied to the solenoid valve coil to drive the solenoid valve coil to heat the temperature of the urea nozzle solenoid valve to the first target temperature.

[0017] Optionally, obtaining the fluctuation of the working pressure of the urea pump, the current waveform of the urea nozzle and the nitrogen oxide conversion rate of the exhaust system includes:

[0018] Controlling the urea nozzles to spray urea solution at different flow rates at least M times;

[0019] acquiring the working pressure of the urea pump, the current value of the urea nozzle, and the nitrogen oxide conversion rate of the exhaust system each time the urea nozzle sprays urea solution;

[0020] Based on the current value of the urea nozzle each time the urea nozzle sprays urea solution, the current waveform of the urea nozzle is determined; based on the working pressure of the urea pump each time the urea nozzle sprays urea solution, the fluctuation of the working pressure of the urea pump is determined; and the average value of the nitrogen oxide conversion rates obtained M times is determined as the final nitrogen oxide conversion rate.

[0021] Optionally, after driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, and / or driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature, the method further includes:

[0022] Detecting fluctuations in the operating pressure of the urea pump;

[0023] When the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, the first heating device is driven to heat the temperature of the urea nozzle solenoid valve to a first target temperature and continues heating for a first preset time, and / or the second heating device is driven to heat the exhaust temperature of the exhaust system to a second target temperature and continues heating for a second preset time;

[0024] The step of detecting the working pressure of the urea pump is repeated until the working pressure of the urea pump is less than or equal to the preset pressure.

[0025] Optionally, the method further comprises:

[0026] determining a first cumulative number of times that the first heating device is driven to heat the temperature of the urea nozzle solenoid valve to a first target temperature and a second cumulative number of times that the second heating device is driven to heat the exhaust temperature of the exhaust system to a second target temperature;

[0027] If the first cumulative number and / or the second cumulative number is greater than a preset cumulative number, a fault prompt message is sent.

[0028] A second aspect of an embodiment of the present invention provides a system for reconnecting a urea nozzle, wherein the urea nozzle is provided with a first heating device, and the exhaust system is provided with a second heating device, comprising:

[0029] A parameter acquisition module, used to acquire the fluctuation of the working pressure of the urea pump, the current waveform of the urea nozzle and the nitrogen oxide conversion rate of the exhaust system;

[0030] a reconnection module, configured to, when the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, drive the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, and / or drive the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature according to the current waveform and the nitrogen oxide conversion rate, so as to reconnect the urea nozzle;

[0031] The working pressure fluctuation characteristic curve is a trend curve representing the change of the working pressure with the injection flow rate of the urea nozzle.

[0032] A third aspect of the embodiments of the present invention provides a computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the steps of the method for rerouting a urea nozzle according to the first aspect of the embodiments of the present invention.

[0033] A fourth aspect of the embodiments of the present invention provides a vehicle, comprising the system for rerouting the urea nozzle according to the second aspect of the embodiments of the present invention.

[0034] The present invention provides a method, system, storage medium and vehicle for reopening a urea nozzle. The method comprises: obtaining the fluctuation of the working pressure of a urea pump, the current waveform of the urea nozzle and the nitrogen oxide conversion rate of the exhaust system; when the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, according to the current waveform and the nitrogen oxide conversion rate, driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, and / or driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature, so as to reopen the urea nozzle; wherein the working pressure fluctuation characteristic curve is a trend curve characterizing the change of the working pressure with the injection flow rate of the urea nozzle.

[0035] The method disclosed in the present invention proposes a method for autonomously analyzing the cause of urea nozzle blockage and taking corresponding restoration measures based on the working pressure of the urea pump, the current waveform of the urea nozzle and the nitrogen oxide conversion rate of the exhaust system, thereby realizing the automation of the entire process from fault discovery to fault elimination and the autonomy of unblocking the blockage, thereby reducing the time and labor cost required for fault repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0037] Figure 1 It is a step diagram of a method for rerouting a urea nozzle provided by an embodiment of the present invention;

[0038] Figure 2 A step diagram for obtaining control parameters of a reconnected urea nozzle provided by an embodiment of the present invention;

[0039] Figure 3 is a step diagram of another method for rerouting a urea nozzle provided by an embodiment of the present invention;

[0040] Figure 4 is a flow chart of a method for reconnecting a urea nozzle provided in an embodiment of the present invention;

[0041] Figure 5 A system for reconnecting a urea nozzle is provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] The first aspect of the present invention provides an embodiment, such as Figure 1 As shown in the step diagram of a method for rerouting a urea nozzle, the method is applied to a urea supply system fault detection system, and specifically includes:

[0044] Step S101, obtaining the working pressure of the urea pump, the current waveform of the urea nozzle and the nitrogen oxide conversion rate of the exhaust system.

[0045] The urea pump is a pumping device for urea solution, which is used to extract urea solution from the urea tank and spray it into the chamber of the selective catalytic reduction device from the urea nozzle.

[0046] The working pressure of the urea pump usually increases with the increase of the injection flow rate of the urea nozzle, and its working pressure can be collected and obtained by the pressure sensor of the urea pump.

[0047] Urea nozzle is a urea spraying device, usually installed on the selective catalytic reducer, used to spray urea in the form of fine liquid droplets to increase the contact area between urea and nitrogen oxides.

[0048] The current waveform of the urea nozzle refers to the current waveform of the urea nozzle solenoid valve, and the urea nozzle solenoid valve is used to control the opening or closing of the urea nozzle needle valve.

[0049] The nitrogen oxide conversion rate refers to the conversion rate of nitrogen oxides into nitrogen after catalytic oxidation, which can be collected and obtained through nitrogen oxide sensors installed before and after the selective catalytic reduction device.

[0050] Step S102, when the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, according to the current waveform and the nitrogen oxide conversion rate, drive the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, and / or drive the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature, so as to reopen the urea nozzle, wherein the working pressure fluctuation characteristic curve is a curve characterizing the changing trend of the working pressure with the injection flow rate of the urea nozzle.

[0051] When the urea nozzle is unobstructed, the working pressure of the urea pump and the injection flow rate of the urea nozzle are in a positive correlation. The greater the working pressure of the urea pump, the greater the injection flow rate of the urea nozzle. When the urea nozzle is blocked, the positive correlation between the working pressure of the urea pump and the injection flow rate of the urea nozzle is destroyed, and the injection flow rate of the urea nozzle no longer increases with the increase of the working pressure of the urea pump, or the increase is much smaller than when the urea nozzle is unobstructed.

[0052] Therefore, when the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, it indicates that the urea nozzle of the urea supply system is clogged. At this time, the first heating device should be driven to heat the temperature of the urea nozzle to the first target temperature, and / or the second heating device should be driven to heat the exhaust temperature of the exhaust system to the second target temperature according to the current waveform and the nitrogen oxide conversion rate, so as to reopen the urea nozzle.

[0053] The method described in this embodiment proposes a method for autonomously analyzing the cause of urea nozzle blockage and taking corresponding restoration measures based on the working pressure of the urea pump, the current waveform of the urea nozzle and the nitrogen oxide conversion rate of the exhaust system, thereby realizing the automation of the entire process from fault discovery to fault elimination and the autonomy of unblocking blockage, thereby reducing the time and labor costs required for fault repair.

[0054] The second aspect of the present invention provides an embodiment. In addition to the method described in the first aspect of the present invention, this embodiment also includes:

[0055] Optionally, step S102 may be implemented by the following step 1 or step 2:

[0056] There are usually two reasons for the blockage of urea nozzle. One is that the combustion products in the engine exhaust gas block the urea nozzle orifice, and the other is that urea crystals block the urea nozzle solenoid valve orifice.

[0057] The combustion products in the engine exhaust are mostly carbon deposits caused by incomplete combustion. After the carbon deposits are generated in the combustion chamber, they are discharged out of the vehicle after the exhaust gas passes through the urea nozzle. When the exhaust gas passes through the urea nozzle, the carbon deposits it carries will adhere to the nozzle of the urea nozzle. As the amount of adhered carbon deposits increases, the nozzle of the urea nozzle will eventually be blocked.

[0058] Urea crystals refer to condensed urea, which is formed by the condensation of the remaining urea after the water in the urea solution remaining at the urea nozzle evaporates. Urea crystals are solid matter, and condensing at the solenoid valve port of the urea nozzle will block the injection path of the urea nozzle, so that the urea solution pumped out by the urea pump cannot enter the chamber of the selective catalytic reducer normally, thereby causing the nitrogen oxide content in the vehicle exhaust to exceed the content allowed by national emission regulations.

[0059] Therefore, it is necessary to take corresponding measures according to the different causes of urea nozzle blockage.

[0060] Step 1: When the current waveform does not conform to the current waveform characteristic curve, drive the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, wherein the current waveform characteristic curve is a curve characterizing the trend of the current value of the urea nozzle changing with the injection flow rate of the urea nozzle.

[0061] When the valve port of the urea nozzle solenoid valve is blocked by urea crystals, the solenoid valve will not be able to close or open normally due to its valve body, resulting in an abnormal current waveform of the urea nozzle. Therefore, when the current waveform does not conform to the current waveform characteristic curve, it is determined that the urea nozzle blockage is caused by urea crystals, and the first heating device should be driven to heat the temperature of the urea nozzle solenoid valve to a first target temperature and maintain it for a first time, wherein the first target temperature should be higher than the melting point of urea.

[0062] Step 2, when the current waveform conforms to the current waveform characteristic curve, according to the nitrogen oxide conversion rate, driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature.

[0063] When the current waveform conforms to the current waveform characteristic curve, it is necessary to further determine whether the urea nozzle is blocked based on the conversion rate of nitrogen oxides.

[0064] Optionally, step 2 may also be implemented by the following step 21 or step 22:

[0065] Step 21: If the nitrogen oxide conversion rate is less than or equal to the preset conversion rate, driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature.

[0066] When the current waveform is normal, if the nitrogen oxide conversion rate is less than or equal to the preset conversion rate, it means that the urea is not sprayed smoothly and the urea nozzle is blocked, but it is not caused by the abnormality of the urea nozzle solenoid valve. This indicates that the blockage of the urea nozzle should be caused by the combustion products in the engine exhaust gas.

[0067] At this time, the combustion products in the engine exhaust gas should be cleared, the exhaust temperature of the exhaust system should be increased, and the exhaust problem should be raised to the second target temperature to burn the carbon deposits adhering to the nozzle of the urea nozzle.

[0068] Step 22: If the nitrogen oxide conversion rate is greater than the preset conversion rate, a prompt message indicating that the urea pump operating pressure is abnormal is sent.

[0069] When the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, if the current waveform is normal and the nitrogen oxide conversion rate is greater than the preset conversion rate, it indicates that there should be a problem with the working pressure of the urea pump, and a prompt message indicating that the working pressure of the urea pump is abnormal should be sent to the user.

[0070] Optionally, the first heating device is a solenoid valve coil surrounding the urea nozzle, and driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature includes:

[0071] Power is supplied to the solenoid valve coil to drive the solenoid valve coil to heat the temperature of the urea nozzle solenoid valve to the first target temperature.

[0072] A solenoid valve is installed on the urea nozzle. Before the urea nozzle sprays urea solution, it is necessary to energize the solenoid valve so that the solenoid valve coil generates a magnetic field, which then attracts the ejector pin at the mouth of the urea nozzle through the magnetic field, opens the needle valve of the urea nozzle, and forms an injection passage.

[0073] When the solenoid valve coil is energized, heat is generated, which is then transferred to the urea nozzle to heat the urea nozzle to the target temperature.

[0074] By using the solenoid valve coil of the urea nozzle to heat the urea nozzle, the urea crystals can be melted without changing the original structure of the urea nozzle, thereby reopening the urea nozzle.

[0075] Alternatively, if Figure 2 As shown in the figure of a step of obtaining the control parameters of the urea nozzle reconnection, step S101 includes:

[0076] Step S1011, controlling the urea nozzle to spray urea solution at least M times at different flow rates.

[0077] Step S1012, obtaining the working pressure of the urea pump, the current value of the urea nozzle, and the nitrogen oxide conversion rate of the exhaust system each time the urea nozzle injects urea solution.

[0078] Step S1013, determining the current waveform of the urea nozzle based on the current value of the urea nozzle each time the urea nozzle sprays urea solution; determining the fluctuation of the working pressure of the urea pump based on the working pressure of the urea pump each time the urea nozzle sprays urea solution; and determining the average value of the nitrogen oxide conversion rates obtained M times as the final nitrogen oxide conversion rate.

[0079] Alternatively, if Figure 3 As shown in the step diagram of another method for rerouting a urea nozzle, the method includes steps S101-S102 and further includes:

[0080] Step S103, detecting the fluctuation of the working pressure of the urea pump.

[0081] After implementing corresponding restoration measures on the urea nozzle, it is also necessary to confirm whether the urea nozzle has been successfully restored by testing the working pressure of the urea pump.

[0082] When the working pressure fluctuation conforms to the working pressure fluctuation characteristic curve, it indicates that the urea nozzle is reopened successfully, and the process of reopening the urea nozzle ends; when the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, the process goes to step S104.

[0083] Step S104, when the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, according to the current waveform and the nitrogen oxide conversion rate, drive the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, and continue heating for a first preset time, and / or drive the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature, and continue heating for a second preset time.

[0084] Step S105 , repeating the step of detecting the working pressure of the urea pump until the working pressure of the urea pump is less than or equal to the preset pressure.

[0085] To further detect whether the urea nozzle re-opening is successful, the fluctuation of the working pressure of the urea pump should be detected again, and if the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, step S104 is repeated until the working pressure fluctuation conforms to the working pressure fluctuation characteristic curve. When the working pressure fluctuation conforms to the working pressure fluctuation characteristic curve, the process of re-opening the urea nozzle is terminated.

[0086] Optionally, the method also includes: determining a first cumulative number of times the first heating device is driven to heat the temperature of the urea nozzle solenoid valve to a first target temperature and a second cumulative number of times the second heating device is driven to heat the exhaust temperature of the exhaust system to a second target temperature; if the first cumulative number and / or the second cumulative number is greater than a preset cumulative number, a fault prompt message is sent.

[0087] While looping the above steps S103 and S104, a first cumulative number of times the first heating device is driven to heat the temperature of the urea nozzle solenoid valve to a first target temperature and a second cumulative number of times the second heating device is driven to heat the exhaust temperature of the exhaust system to a second target temperature should also be determined. When the first cumulative number and / or the second cumulative number is greater than the preset cumulative number, it indicates that the urea nozzle is clogged and cannot be cleared by the vehicle itself. At this time, a fault prompt message should be sent to the user to prompt the user to intervene.

[0088] The third aspect of the present invention provides an embodiment, such as Figure 4 As shown in the flowchart of a method for reconnecting a urea nozzle, the method comprises:

[0089] Firstly, the urea nozzle is controlled to spray urea solution M times at different flow rates, and the working pressure of the urea pump, the current value of the urea nozzle and the nitrogen oxide conversion rate of the exhaust system are obtained each time the urea nozzle sprays urea solution.

[0090] Based on the current value of the urea nozzle each time the urea nozzle sprays urea solution, the current waveform of the urea nozzle is determined; based on the working pressure of the urea pump each time the urea nozzle sprays urea solution, the fluctuation of the working pressure of the urea pump is determined; and the average value of the M nitrogen oxide conversion rates obtained is determined as the final nitrogen oxide conversion rate.

[0091] According to the obtained fluctuation of the working pressure of the urea pump, it is determined whether the fluctuation of the working pressure of the urea pump is normal.

[0092] When the working pressure fluctuation of the urea pump is normal, that is, when the working pressure fluctuation conforms to the working pressure fluctuation characteristic curve, if the nitrogen oxide conversion rate is normal, that is, the nitrogen oxide conversion rate is greater than the preset conversion rate, the urea nozzle reopening process is terminated; if the nitrogen oxide conversion rate is abnormal, that is, the nitrogen oxide conversion rate is less than or equal to the preset conversion rate, a fault message of abnormal nitrogen oxide conversion is sent, and the carrier is checked for fault.

[0093] When the working pressure fluctuation of the urea pump is abnormal, that is, when the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, if the current waveform of the urea nozzle is normal, that is, the current waveform conforms to the current waveform characteristic curve, it is determined whether the nitrogen oxide conversion rate is normal; if the current waveform of the urea nozzle is abnormal, that is, the current waveform does not conform to the current waveform characteristic curve, the first heating device is driven to heat the temperature of the urea nozzle solenoid valve to above 200 degrees Celsius and continue heating for 300 seconds.

[0094] After driving the first heating device to heat the temperature of the urea nozzle solenoid valve to above 200 degrees Celsius and continuously heating for 300 seconds, the fluctuation of the working pressure of the urea pump is detected again, and when the working pressure fluctuation of the urea pump is abnormal, the process of urea nozzle is circulated and reopened until the working pressure fluctuation of the urea pump is normal, the process is terminated, or when it is detected that the first heating device is driven to heat the temperature of the urea nozzle solenoid valve to above 200 degrees Celsius and continuously heating for 300 seconds three times, a fault prompt information is sent.

[0095] If it is determined that the nitrogen oxide conversion rate is normal, that is, the nitrogen oxide conversion rate is greater than the preset conversion rate, a fault prompt message indicating abnormal fluctuation of the urea pump operating pressure is sent, and the urea pump pressure sensor is checked.

[0096] If it is determined that the nitrogen oxide conversion rate is abnormal, that is, the nitrogen oxide conversion rate is less than or equal to the preset conversion rate, the second heating device is driven to heat the exhaust temperature of the exhaust system to above 500 degrees Celsius and continue heating for 600 seconds.

[0097] After driving the second heating device to heat the exhaust temperature of the exhaust system to above 500 degrees Celsius and continuously heating for 600 seconds, detect the fluctuation of the working pressure of the urea pump again, and when the working pressure fluctuation of the urea pump is abnormal, circulate the process of reopening the urea nozzle until the working pressure fluctuation of the urea pump is normal, end the process, or send a fault prompt message when it is detected that the second heating device is driven to heat the exhaust temperature of the exhaust system to above 500 degrees Celsius and continuously heating for 600 seconds three times.

[0098] A fourth aspect of the present invention provides an embodiment, such as Figure 5 A system for reconnecting a urea nozzle is shown, the system comprising:

[0099] A parameter acquisition module, used to acquire the fluctuation of the working pressure of the urea pump, the current waveform of the urea nozzle and the nitrogen oxide conversion rate of the exhaust system;

[0100] a reconnection module, configured to, when the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, drive the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, and / or drive the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature according to the current waveform and the nitrogen oxide conversion rate, so as to reconnect the urea nozzle;

[0101] The working pressure fluctuation characteristic curve is a trend curve representing the change of the working pressure with the injection flow rate of the urea nozzle.

[0102] Optionally, the reconnection module includes:

[0103] a first reconnection module, configured to drive the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature when the current waveform does not conform to the current waveform characteristic curve;

[0104] The second reconnection module is used to drive the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature according to the nitrogen oxide conversion rate when the current waveform conforms to the current waveform characteristic curve; wherein the current waveform characteristic curve is a curve representing the trend of the current value of the urea nozzle changing with the injection flow rate of the urea nozzle.

[0105] Optionally, the second restoration module is also used to drive the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature if the nitrogen oxide conversion rate is less than or equal to the preset conversion rate; if the nitrogen oxide conversion rate is greater than the preset conversion rate, send a prompt message that the working pressure of the urea pump is abnormal.

[0106] Optionally, the first reconnection module is further used to supply power to the solenoid valve coil to drive the solenoid valve coil to heat the temperature of the urea nozzle solenoid valve to the first target temperature.

[0107] Optionally, the parameter acquisition module is further used to control the urea nozzle to spray urea solution at least M times at different flow rates; acquire the working pressure of the urea pump, the current value of the urea nozzle and the nitrogen oxide conversion rate of the exhaust system each time the urea nozzle sprays urea solution; determine the current waveform of the urea nozzle based on the current value of the urea nozzle each time the urea nozzle sprays urea solution; determine the fluctuation of the working pressure of the urea pump based on the working pressure of the urea pump each time the urea nozzle sprays urea solution; and determine the average value of the nitrogen oxide conversion rates acquired M times as the final nitrogen oxide conversion rate.

[0108] Optionally, the system further includes a circulation module for detecting fluctuations in the working pressure of the urea pump; when the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature and continuously heating for a first preset time, and / or driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature and continuously heating for a second preset time; repeating the step of detecting the working pressure of the urea pump until the working pressure of the urea pump is less than or equal to the preset pressure.

[0109] Optionally, the system further includes a counting module, configured to determine a first cumulative number of times the first heating device is driven to heat the temperature of the urea nozzle solenoid valve to a first target temperature and a second cumulative number of times the second heating device is driven to heat the exhaust temperature of the exhaust system to a second target temperature;

[0110] If the first cumulative number and / or the second cumulative number is greater than a preset cumulative number, a fault prompt message is sent.

[0111] The embodiment of the present application further provides a computer-readable storage medium having a computer program / instruction stored thereon. When the computer program / instruction is executed by a processor, a method for rerouting a urea nozzle as disclosed in the embodiment of the present application is implemented.

[0112] An embodiment of the present invention further provides a vehicle, comprising a system for reconnecting a urea nozzle provided by the present invention.

[0113] The method disclosed in the present invention proposes a method for autonomously analyzing the cause of urea nozzle blockage and taking corresponding restoration measures based on the working pressure of the urea pump, the current waveform of the urea nozzle and the nitrogen oxide conversion rate of the exhaust system, thereby realizing the automation of the entire process from fault discovery to fault elimination and the autonomy of unblocking the blockage, thereby reducing the time and labor cost required for fault repair.

[0114] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0115] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, systems, electronic devices, and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0116] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0117] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0118] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0119] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0120] The method, system, storage medium and vehicle for rerouting a urea nozzle provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for re-opening a urea nozzle, characterized in that: The urea nozzle is provided with a first heating device, and the exhaust system is provided with a second heating device, including: Obtaining fluctuations in the working pressure of the urea pump, the current waveform of the urea nozzle solenoid valve, and the nitrogen oxide conversion rate of the exhaust system; When the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, and the current waveform does not conform to the current waveform characteristic curve, driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, so as to eliminate the blockage of the urea nozzle caused by urea crystallization; When the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve and the current waveform conforms to the current waveform characteristic curve, according to the nitrogen oxide conversion rate, driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature, so as to eliminate the blockage of the urea nozzle caused by the combustion products in the engine exhaust gas; The working pressure fluctuation characteristic curve is a trend curve representing the working pressure changing with the injection flow rate of the urea nozzle, and the current waveform characteristic curve is a curve representing the current value of the urea nozzle solenoid valve changing with the injection flow rate of the urea nozzle.

2. The method according to claim 1, characterized in that According to the nitrogen oxide conversion rate, driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature includes: If the nitrogen oxide conversion rate is less than or equal to a preset conversion rate, driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature; If the nitrogen oxide conversion rate is greater than the preset conversion rate, a prompt message indicating that the working pressure of the urea pump is abnormal is sent.

3. The method according to claim 1, characterized in that The first heating device is a solenoid valve coil surrounding the urea nozzle, and driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature includes: Power is supplied to the solenoid valve coil to drive the solenoid valve coil to heat the temperature of the urea nozzle solenoid valve to the first target temperature.

4. The method according to claim 1, characterized in that Obtaining the fluctuation of the working pressure of the urea pump, the current waveform of the urea nozzle solenoid valve and the nitrogen oxide conversion rate of the exhaust system, including: Controlling the urea nozzles to spray urea solution at different flow rates at least M times; acquiring the working pressure of the urea pump, the current value of the urea nozzle solenoid valve, and the nitrogen oxide conversion rate of the exhaust system each time the urea nozzle sprays urea solution; Based on the current value of the urea nozzle solenoid valve each time the urea nozzle sprays urea solution, the current waveform of the urea nozzle solenoid valve is determined; based on the working pressure of the urea pump each time the urea nozzle sprays urea solution, the fluctuation of the working pressure of the urea pump is determined; and the average value of the nitrogen oxide conversion rates obtained M times is determined as the final nitrogen oxide conversion rate.

5. The method according to claim 1, characterized in that After driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, or driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature, the method further includes: Detecting fluctuations in the operating pressure of the urea pump; When the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve, and the current waveform does not conform to the current waveform characteristic curve, driving the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature, and continuing the heating for a first preset time; When the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve and the current waveform conforms to the current waveform characteristic curve, according to the nitrogen oxide conversion rate, driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature and continue heating for a second preset time; The step of detecting the working pressure of the urea pump is repeated until the working pressure of the urea pump is less than or equal to a preset pressure.

6. The method according to claim 5, characterized in that The method further comprises: determining a first cumulative number of times that the first heating device is driven to heat the temperature of the urea nozzle solenoid valve to a first target temperature and a second cumulative number of times that the second heating device is driven to heat the exhaust temperature of the exhaust system to a second target temperature; If the first cumulative number and / or the second cumulative number is greater than a preset cumulative number, a fault prompt message is sent.

7. A system for reconnecting a urea nozzle, characterized in that: The urea nozzle is provided with a first heating device, and the exhaust system is provided with a second heating device, including: A parameter acquisition module, used to acquire the fluctuation of the working pressure of the urea pump, the current waveform of the urea nozzle solenoid valve and the nitrogen oxide conversion rate of the exhaust system; a reconnection module, configured to drive the first heating device to heat the temperature of the urea nozzle solenoid valve to a first target temperature when the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve and the current waveform does not conform to the current waveform characteristic curve, so as to eliminate the blockage of the urea nozzle caused by urea crystallization; When the working pressure fluctuation does not conform to the working pressure fluctuation characteristic curve and the current waveform conforms to the current waveform characteristic curve, according to the nitrogen oxide conversion rate, driving the second heating device to heat the exhaust temperature of the exhaust system to a second target temperature, so as to eliminate the blockage of the urea nozzle caused by the combustion products in the engine exhaust gas; The working pressure fluctuation characteristic curve is a trend curve representing the working pressure changing with the injection flow rate of the urea nozzle, and the current waveform characteristic curve is a curve representing the current value of the urea nozzle solenoid valve changing with the injection flow rate of the urea nozzle.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method for rerouting a urea nozzle according to any one of claims 1 to 6 are implemented.

9. A vehicle, characterized in that: A system comprising the reconnection urea nozzle as claimed in claim 7.

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