Urea injection control method and device, storage medium and electronic equipment

Abstract

The application provides a urea injection control method and device, a storage medium and an electronic device, wherein an intake flow rate detected by using an air pressure sensor of a vehicle is used to determine an ideal exhaust flow rate; when the exhaust flow rate of a differential pressure sensor of the vehicle reaches the ideal exhaust flow rate, a target time and an exhaust lag time length are determined; the target time is the time when the exhaust flow rate of the differential pressure sensor reaches the ideal exhaust flow rate; the exhaust lag time length is the time length required from determining the ideal exhaust flow rate to the exhaust flow rate of the differential pressure sensor reaching the ideal exhaust flow rate; the exhaust flow rate is determined by using the exhaust lag time length, a delay time length determined according to the exhaust flow rate is processed with the target time, a urea injection time is obtained, and the urea injection is controlled according to the urea injection time. The whole process considers the time delay of exhaust gas from the differential pressure sensor to the urea nozzle, avoids the influence of the time delay on urea injection, improves the precision of the urea injection time, makes the urea fully mix with the exhaust gas, and reduces harmful gas emission.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tail gas treatment, in particular to a urea injection control method and device, a storage medium and an electronic device. BACKGROUND

[0002] Currently, in vehicles applying non-road national standard four, SCR route is generally used to reduce NOx emission, downstream NOx sensor is equipped to monitor tail emission, and urea nozzle is an important component of SCR, and the injection effect of the urea nozzle directly affects the NOx conversion efficiency.

[0003] The vehicle applying non-road national standard four often shows strong transient characteristics in non-road operation, and the transient mainly reflects the rapid increase and decrease of exhaust flow with load change, so that the urea injection timing cannot be accurately coupled with the exhaust flow, resulting in poor mixing effect of urea and exhaust, and the risk of crystallization and NOx emission exceeding the standard. SUMMARY

[0004] Therefore, the embodiments of the present application provide a urea injection control method and device, a storage medium and an electronic device, and the scheme provided by the present application can accurately control urea injection, so that urea is injected at the best time and coupled with exhaust flow to reduce NOx emission.

[0005] To achieve the above object, the embodiments of the present application provide the following technical scheme:

[0006] A urea injection control method, comprising:

[0007] obtaining intake flow detected by a pressure sensor of a vehicle, and determining an exhaust flow ideal value corresponding to the intake flow;

[0008] when the exhaust flow of the differential pressure sensor of the vehicle reaches the exhaust flow ideal value, determining a target time and an exhaust lag time; the target time is the time when the exhaust flow of the differential pressure sensor reaches the exhaust flow ideal value; the exhaust lag time is the time required from determining the exhaust flow ideal value to the exhaust flow of the differential pressure sensor reaching the exhaust flow ideal value;

[0009] determining the exhaust flow rate of the vehicle by using the exhaust lag time;

[0010] determining the delay time of the exhaust of the vehicle from the differential pressure sensor to the urea nozzle of the vehicle by using the exhaust flow rate;

[0011] determining the urea injection time based on the delay time and the target time, and controlling the urea nozzle of the vehicle to inject urea according to the urea injection time.

[0012] The method, optionally, the determining of the ideal value of the exhaust flow corresponding to the intake flow comprises:

[0013] The method, optionally, the determining of the fuel flow of the vehicle comprises:

[0014] The method, optionally, the processing of the intake flow and the fuel flow to obtain the ideal value of the exhaust flow corresponding to the intake flow comprises:

[0015] The method, optionally, the determining of the exhaust flow of the differential pressure sensor of the vehicle comprises:

[0016] The method, optionally, the obtaining of the engine speed of the vehicle comprises:

[0017] The method, optionally, the obtaining of the differential pressure value of the differential pressure sensor comprises:

[0018] The method, optionally, the determining of the exhaust flow of the differential pressure sensor of the vehicle by applying the engine speed and the differential pressure value in a preset exhaust flow table comprises:

[0019] The method, optionally, the determining of the exhaust flow rate of the vehicle by applying the exhaust lag time comprises:

[0020] The method, optionally, the determining of the first distance between the air pressure sensor and the differential pressure sensor comprises:

[0021] The method, optionally, the obtaining of the exhaust flow rate of the vehicle by operating the exhaust lag time and the first distance comprises:

[0022] The method, optionally, the determining of the delay time of the exhaust of the vehicle from the differential pressure sensor to the urea nozzle of the vehicle by applying the exhaust flow rate comprises:

[0023] The method, optionally, the determining of the second distance between the differential pressure sensor and the urea nozzle comprises:

[0024] The method, optionally, the obtaining of the delay time of the exhaust of the vehicle from the differential pressure sensor to the urea nozzle of the vehicle by operating the exhaust flow rate and the second distance comprises:

[0025] The method, optionally, the determining of the urea injection time based on the delay time and the target time comprises:

[0026] The method, optionally, the obtaining of the urea injection time by adding the delay time and the target time comprises:

[0027] A urea injection control device, comprising:

[0028] A first obtaining unit is configured to obtain an intake flow detected by an air pressure sensor of a vehicle and determine an ideal value of an exhaust flow corresponding to the intake flow.

[0029] The first determining unit is configured to determine a target time and an exhaust lag time length when the exhaust flow rate of the differential pressure sensor of the vehicle reaches the ideal exhaust flow rate.

[0030] The second determining unit is configured to determine the exhaust flow rate of the vehicle by using the exhaust lag time length.

[0031] The third determining unit is configured to determine a delay time length of the exhaust of the vehicle from the differential pressure sensor to the urea nozzle of the vehicle by using the exhaust flow rate.

[0032] The control unit is configured to determine a urea injection time based on the delay time length and the target time, and control the urea nozzle of the vehicle to inject urea according to the urea injection time.

[0033] The device, optionally, the first obtaining unit comprises:

[0034] The first determining sub-unit is configured to determine the fuel flow rate of the vehicle.

[0035] The processing sub-unit is configured to process the intake flow rate and the fuel flow rate to obtain an ideal exhaust flow rate corresponding to the intake flow rate.

[0036] The device, optionally, further comprises:

[0037] The second obtaining unit is configured to obtain the engine speed of the vehicle.

[0038] The third obtaining unit is configured to obtain the differential pressure value of the differential pressure sensor.

[0039] The fourth determining unit is configured to determine the exhaust flow rate of the differential pressure sensor of the vehicle in a preset exhaust flow rate table by using the engine speed and the differential pressure value.

[0040] The device, optionally, the second determining unit comprises:

[0041] The second determining sub-unit is configured to determine a first distance between the air pressure sensor and the differential pressure sensor.

[0042] The first operation sub-unit is configured to perform operation on the exhaust lag time length and the first distance to obtain the exhaust flow rate of the vehicle.

[0043] In another embodiment provided by the application, the third determining unit of the device comprises:

[0044] A third determining sub-unit is configured to determine a second distance between the differential pressure sensor and the urea nozzle.

[0045] A second calculating sub-unit is configured to calculate the exhaust flow rate and the second distance to obtain a delay time length of the exhaust gas of the vehicle from the differential pressure sensor to the urea nozzle of the vehicle.

[0046] The device described above, optionally, the control unit comprises:

[0047] A third calculating sub-unit is configured to add the delay time length and the target time to obtain a urea injection time.

[0048] A storage medium comprises stored instructions, wherein the instructions, when executed, control a device in which the storage medium is located to perform the urea injection control method described above.

[0049] An electronic device comprises a memory and one or more instructions, wherein the one or more instructions are stored in the memory and configured to be executed by one or more processors to perform the urea injection control method described above.

[0050] Compared with the prior art, the present application has the following advantages:

[0051] In the method provided by the present application, the intake flow rate detected by the air pressure sensor of the vehicle is obtained, and the ideal value of the exhaust flow rate corresponding to the intake flow rate is determined; when the exhaust flow rate of the differential pressure sensor of the vehicle reaches the ideal value of the exhaust flow rate, the target time and the exhaust lag time length are determined; the target time is the time when the exhaust flow rate of the differential pressure sensor reaches the ideal value of the exhaust flow rate; the exhaust lag time length is the time length required from determining the ideal value of the exhaust flow rate to the exhaust flow rate of the differential pressure sensor reaching the ideal value of the exhaust flow rate; the exhaust flow rate of the vehicle is determined by applying the exhaust lag time length; the delay time length of the exhaust gas of the vehicle from the differential pressure sensor to the urea nozzle of the vehicle is determined by applying the exhaust flow rate; based on the delay time length and the target time, the urea injection time is determined, and the urea nozzle of the vehicle is controlled to inject urea according to the urea injection time. When injecting urea, the exhaust flow rate is determined by using the measurement values of the air pressure sensor and the differential pressure sensor, and the time delay length of the exhaust gas from the differential pressure sensor to the urea nozzle is determined by using the exhaust flow rate, and the urea injection time is determined according to the time delay length. When injecting urea, the time delay of the exhaust gas from the differential pressure sensor to the urea nozzle is considered, the influence of the time delay on the injection of urea is avoided, so that the timing of the injection of urea is more accurate, the problem of uneven mixing of gas caused by the difference in the timing of the injection of urea is reduced, and the problem of crystallization or poor emission adaptability is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative effort based on the provided drawings.

[0053] Figure 1 A method flow chart of a urea injection control method provided for an embodiment of the present application;

[0054] Figure 2 A flow chart of determining exhaust flow by a differential pressure sensor of a vehicle provided for an embodiment of the present application;

[0055] Figure 3 An example diagram of determining urea injection time provided for an embodiment of the present application;

[0056] Figure 4 An example diagram of determining exhaust flow provided for an embodiment of the present application;

[0057] Figure 5 A structural schematic diagram of a urea injection control device provided for an embodiment of the present application;

[0058] Figure 6 A structural schematic diagram of an electronic device provided for an embodiment of the present application. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only represent some 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 effort fall within the scope of protection of the present application.

[0060] In the present application, the term “comprising” or “including” or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitation, the element defined by the sentence “including a…” does not exclude the presence of another identical element in the process, method, article or device including the element.

[0061] Term explanation:

[0062] Urea nozzle: an important component of Selective Catalytic Reduction (SCR) system, which can atomize and spray the pressurized urea.

[0063] Mixer: the area where the atomized urea and engine exhaust gas are mixed during post-processing.

[0064] Exhaust flow: the flow of exhaust gas generated by engine combustion, generally evaluated in terms of mass flow or volume flow.

[0065] As can be known from the background art, the current urea injection method has the problem that the urea injection timing cannot be accurately coupled with the exhaust flow, resulting in poor mixing effect of urea and exhaust gas, and the risk of crystallization and NOx emission exceeding the standard. The exhaust flow and the change of the exhaust flow in the prior art are idealized models, and the urea delayed injection is made on this basis, which can solve the problem of poor coupling degree of injection timing to a certain extent, but still has the defect of open-loop control, and when the exhaust gas change speed is uncertain, the injection timing is also uncertain.

[0066] To solve the problem of inaccurate urea injection timing in the prior art, the present application provides a urea injection control scheme, which determines the gas flow rate according to the time delay of the measurement values of the air pressure sensor and the differential pressure sensor, determines the time delay of the exhaust gas from the differential pressure sensor to the urea injection according to the gas flow rate, and determines the injection time of the urea according to the time delay. The whole process eliminates the influence of the time delay of the exhaust process, makes the urea injection timing more accurate, effectively reduces the problem of uneven mixing caused by poor urea injection timing, and further reduces the problem of crystallization or poor emission adaptability.

[0067] The present application can be used in many general or special computing device environments or configurations. For example: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor devices, distributed computing environments that include any of the above devices or devices, etc.

[0068] The present application can be applied to the control system of a vehicle, which can be composed of a computing device or a computer terminal.

[0069] Reference Figure 1 A method flow chart of a urea injection control method provided by the embodiment of the present application is provided, and the specific description is as follows.

[0070] S101, obtain the intake flow detected by the air pressure sensor of the vehicle, and determine the ideal value of the exhaust flow corresponding to the intake flow.

[0071] The vehicle is in a working state, and the intake flow rate detected by the air pressure sensor of the vehicle is obtained. The air pressure sensor is a BPS sensor in the vehicle, which is used to measure the intake flow rate of the vehicle. The measured intake flow rate can be the air flow rate entering the vehicle for burning fuel.

[0072] When the vehicle is in a working state, the air pressure sensor of the vehicle detects the intake flow rate in real time. After detecting the intake flow rate, the ideal exhaust flow rate corresponding to the intake flow rate can be determined.

[0073] When determining the ideal exhaust flow rate, the fuel flow rate of the vehicle detected at the time of detecting the intake flow rate also needs to be determined. The intake flow rate and the fuel flow rate are processed to obtain the ideal exhaust flow rate corresponding to the intake flow rate. The ideal exhaust flow rate can also be referred to as the theoretical exhaust flow rate. The ideal exhaust flow rate is the flow rate of the exhaust gas theoretically discharged after the intake flow rate and the fuel flow rate are burned.

[0074] The fuel flow rate of the vehicle is controlled by the ECU of the vehicle. At the same time, the intake flow rate and the fuel flow rate of the vehicle are obtained, and then the intake flow rate and the fuel flow rate are processed to obtain the ideal exhaust flow rate of the exhaust gas of the vehicle.

[0075] The intake flow rate and the exhaust flow rate maintain a certain conversion rule. The ideal exhaust flow rate can be determined according to the conversion rule. The process of determining the ideal exhaust flow rate is as follows: exhaust flow rate = intake flow rate / 3.6 + 840*fuel flow rate / 3600. The exhaust flow rate in the formula is the ideal exhaust flow rate.

[0076] S102, when the exhaust flow rate of the differential pressure sensor of the vehicle reaches the ideal exhaust flow rate, the target time and the exhaust lag time are determined. The target time is the time when the exhaust flow rate of the differential pressure sensor reaches the ideal exhaust flow rate. The exhaust lag time is the time required from determining the ideal exhaust flow rate to the exhaust flow rate of the differential pressure sensor reaching the ideal exhaust flow rate.

[0077] When the vehicle is in a working state, the differential pressure sensor of the vehicle can determine the exhaust flow rate in real time. The exhaust flow rate determined here is the flow rate of the exhaust gas actually discharged by the vehicle. The flow rate of the exhaust gas actually discharged by the vehicle should be consistent with the flow rate of the exhaust gas theoretically discharged. The fuel combustion needs a certain time, and there is a certain distance between the differential pressure sensor and the air pressure sensor of the vehicle. Therefore, it also needs a certain time for the exhaust gas to flow from the air pressure sensor to the differential pressure sensor. Therefore, from determining the ideal exhaust flow rate based on the intake flow rate detected by the air pressure sensor to detecting the exhaust flow rate corresponding to the intake flow rate by the differential pressure sensor, there is a lag. The lag time can be regarded as the exhaust lag time. In other words, the exhaust lag time can also be the time required from determining the ideal exhaust flow rate to the exhaust flow rate of the differential pressure sensor reaching the ideal exhaust flow rate.

[0078] The present application needs to determine the exhaust lag duration and needs to determine the moment when the exhaust flow of the differential pressure sensor reaches the ideal value of the exhaust flow as the target time, so as to subsequently determine the flow rate of the exhaust gas in the vehicle.

[0079] The differential pressure change generated by the differential pressure sensor is different for different exhaust flows, and the process of determining the exhaust flow of the vehicle's differential pressure sensor is described with reference to Figure 2 , which is described in detail as follows.

[0080] S201, obtaining the engine speed of the vehicle.

[0081] Obtaining the operating parameters of the vehicle, and determining the engine speed from the operating parameters.

[0082] S202, obtaining the differential pressure value of the differential pressure sensor.

[0083] S203, applying the engine speed and the differential pressure value to determine the exhaust flow of the differential pressure sensor of the vehicle in the preset exhaust flow table.

[0084] The exhaust flow table is a pre-set table, in which different engine speeds and differential pressure values correspond to different exhaust flows, and further, the table reflects the relationship between the differential pressure change generated by the differential pressure sensor and the different exhaust flows.

[0085] S103, applying the exhaust lag duration to determine the exhaust flow rate of the vehicle.

[0086] There is a certain distance between the air pressure sensor and the differential pressure sensor in the vehicle, which can be determined by obtaining the parameters of the vehicle. The distance between the air pressure sensor and the differential pressure sensor is the first distance. Dividing the first distance by the exhaust lag duration can obtain the exhaust flow rate of the exhaust gas in the vehicle.

[0087] S104, applying the exhaust flow rate to determine the delay duration of the exhaust gas from the differential pressure sensor to the urea nozzle of the vehicle.

[0088] Further, there is also a certain distance between the differential pressure sensor of the vehicle and the urea nozzle of the vehicle, and the distance between them is the second distance. It takes a certain time for the exhaust gas to flow from the differential pressure sensor to the urea nozzle. At this time, it is necessary to determine the time for the exhaust gas to flow from the differential pressure sensor to the urea nozzle. This time can be regarded as the delay duration. Multiplying the exhaust flow rate by the second distance can obtain the delay duration.

[0089] It should be noted that the exhaust gas of the vehicle refers to the gas discharged from the vehicle, which can also be regarded as exhaust gas.

[0090] S105, based on the delay duration and the target time, determine urea injection time, and control the urea nozzle of the vehicle to inject urea according to the urea injection time.

[0091] The target time is the time when the exhaust flow detected by the differential pressure sensor reaches the ideal exhaust flow value. After determining the delay duration, the delay duration and the target time are added to obtain the urea injection time, which is the best time to inject urea. When the time of the vehicle reaches the urea injection time, the urea nozzle is controlled to inject urea, thereby improving the precision of urea injection.

[0092] In the method provided by the embodiment of the application, the intake flow detected by the air pressure sensor of the vehicle is obtained, and the ideal exhaust flow value corresponding to the intake flow is determined. When the exhaust flow of the differential pressure sensor of the vehicle reaches the ideal exhaust flow value, the target time and the exhaust lag duration are determined. The target time is the time when the exhaust flow of the differential pressure sensor reaches the ideal exhaust flow value. The exhaust lag duration is the duration required from determining the ideal exhaust flow value to the exhaust flow of the differential pressure sensor reaching the ideal exhaust flow value. The exhaust flow rate of the vehicle is determined by using the exhaust lag duration. The delay duration of the exhaust of the vehicle from the differential pressure sensor to the urea nozzle of the vehicle is determined by using the exhaust flow rate. Based on the delay duration and the target time, the urea injection time is determined, and the urea nozzle of the vehicle is controlled to inject urea according to the urea injection time. In the process of injecting urea, the exhaust flow rate is determined by using the measurement values of the air pressure sensor and the differential pressure sensor, and the delay duration required for the exhaust from the differential pressure sensor to the urea nozzle is determined by using the exhaust flow rate. The urea injection time is determined according to the delay duration, and the time delay of the exhaust from the differential pressure sensor to the urea nozzle is considered in the process of injecting urea, thereby avoiding the influence of the time delay on the urea injection, so that the timing of the urea injection is more accurate, and the problem of uneven mixing caused by the difference in the timing of the urea injection, crystallization or poor emission adaptability is reduced.

[0093] In the scheme provided by the application, the gas flow rate is determined according to the time delay of the measurement values of the BPS sensor and the DPF differential pressure sensor. The distance from the differential pressure sensor to the urea nozzle is fixed, and the time can be calculated. The DPF differential pressure sensor records the time when the exhaust reaches the differential pressure sensor. On this basis, the time when the exhaust reaches the nozzle is added, and the best urea injection timing is obtained.

[0094] Reference Figure 3 For the example of determining the urea injection time provided by the embodiment of the application, based on the BPS sensor and the differential pressure sensor, the gas flow time delay (equivalent to the exhaust lag duration in the foregoing) is determined. Curve 1 in the figure represents the change curve of the intake flow passing through the BPS sensor, curve 2 represents the change curve of the exhaust flow passing through the differential pressure sensor, and curve 3 represents the urea injection curve.

[0095] The fuel in the combustion process, the intake flow and exhaust flow keep certain conversion rule, namely: exhaust flow = intake flow / 3.6 + 840 * fuel flow / 3600, thereby calculating the model value of the exhaust flow. Further, the meaning of the model is that when the gas transient changes, the intake and exhaust are similar to the curve of the sine function, and it is difficult to identify whether the value reaching the pressure difference sensor is the peak value. Therefore, the gas change will generate the ideal value (MAP) of the pressure difference change of the pressure difference sensor, and when the real change is close to the preset value, it represents that the time difference between the sine wave of the two gas flows is found.

[0096] The pressure difference change generated by different exhaust flows at the pressure difference sensor is different, and the preset map (equivalent to the exhaust flow table in the foregoing) writes the corresponding relationship, and the exhaust flow measured by the pressure difference sensor can be obtained by querying the map through the engine speed and the pressure difference value. In the actual operation process, the exhaust flow measured by the sensor and the theoretical exhaust flow keep a kind of lagging follow-up, and the lag time difference is Δt (equivalent to the exhaust lag time in the foregoing).

[0097] Reference Figure 4 The example diagram for determining the exhaust flow provided by the embodiment of the application is shown in the figure, the curve a in the figure is the curve of the theoretical value of the exhaust flow, the curve b is the curve of the value measured by the pressure difference sensor on the side of the exhaust flow, and is also the curve of the exhaust flow of the pressure difference sensor, and the curve c is the curve of the intake flow. As shown in the figure, the line type of the theoretical exhaust flow (i.e. the theoretical value of the exhaust flow) and the line type of the actual exhaust flow (the exhaust flow of the pressure difference sensor) are highly consistent, and the time difference of the other line type can be monitored after the data synchronization. Figure 4 It can be known that there is a lag between the theoretical value of the exhaust flow and the exhaust flow of the pressure difference sensor, and the lag time is Δt.

[0098] Continue Figure 3 It is continued to be explained that after the lag time Δt is determined, the distance between the BPS sensor and the pressure difference sensor can be divided by the lag time, and the exhaust flow rate can be obtained, then the distance from the pressure difference sensor to the urea nozzle is multiplied by the exhaust flow rate, and the time length of the exhaust gas from the pressure difference sensor to the urea nozzle can be determined, then the time when the exhaust gas reaches the pressure difference sensor is added to the time length of the exhaust gas from the pressure difference sensor to the urea nozzle, and the best time of injecting urea, i.e. the time when the gas reaches the SCR, can be obtained.

[0099] The urea injection is controlled by the scheme provided by the application, and the urea can be injected when the exhaust gas reaches the SCR, so that the urea fully reflects with the exhaust gas, thereby reducing the emission amount of NOx in the exhaust gas and reducing pollution.

[0100] The change of the exhaust flow rate and the change of the intake flow rate keep followability, the present application utilizes the time delay of the followability to judge the time difference, and utilizes the original vehicle sensor to complete the gas flow rate calculation, based on which the urea injection timing is calculated, and the urea injection is more accurate. The problem of uneven mixing of gases due to different urea injection timing, and further leading to crystallization or poor emission adaptability can be reduced to a certain extent.

[0101] With Figure 1 Corresponding to the method shown in the present application, a urea injection control device is also provided, which is used to support Figure 1 The specific implementation of the method, the device can be provided in the control system of the vehicle.

[0102] Referring to Figure 5 A structure diagram of a urea injection control device provided by an embodiment of the present application is shown, and the specific description is as follows.

[0103] The first acquisition unit 501 is configured to acquire the intake flow rate detected by the air pressure sensor of the vehicle, and determine the ideal value of the exhaust flow rate corresponding to the intake flow rate;

[0104] The first determination unit 502 is configured to determine the target time and the exhaust lag time length when the exhaust flow rate of the differential pressure sensor of the vehicle reaches the ideal value of the exhaust flow rate; the target time is the time when the exhaust flow rate of the differential pressure sensor reaches the ideal value of the exhaust flow rate; and the exhaust lag time length is the time length required from determining the ideal value of the exhaust flow rate to the exhaust flow rate of the differential pressure sensor reaching the ideal value of the exhaust flow rate;

[0105] The second determination unit 503 is configured to determine the exhaust flow rate of the vehicle by using the exhaust lag time length;

[0106] The third determination unit 504 is configured to determine the delay time length of the exhaust of the vehicle from the differential pressure sensor to the urea nozzle of the vehicle by using the exhaust flow rate;

[0107] The control unit 505 is configured to determine the urea injection time based on the delay time length and the target time, and control the urea nozzle of the vehicle to inject urea according to the urea injection time.

[0108] The device provided by the embodiment of the application acquires the intake flow detected by the air pressure sensor of the vehicle and determines an ideal exhaust flow value corresponding to the intake flow; when the exhaust flow of the pressure difference sensor of the vehicle reaches the ideal exhaust flow value, a target time and an exhaust lag duration are determined; the target time is the time when the exhaust flow of the pressure difference sensor reaches the ideal exhaust flow value; the exhaust lag duration is the duration required from the determination of the ideal exhaust flow value to the exhaust flow of the pressure difference sensor reaching the ideal exhaust flow value; the exhaust flow rate of the vehicle is determined by applying the exhaust lag duration; the delay duration of exhaust from the pressure difference sensor to the urea nozzle of the vehicle is determined by applying the exhaust flow rate; the urea injection time is determined based on the delay duration and the target time, and the urea nozzle of the vehicle is controlled to inject urea according to the urea injection time. When urea is injected, the exhaust flow rate is determined by using the measurement values of the air pressure sensor and the pressure difference sensor, and the delay duration of exhaust from the pressure difference sensor to the urea nozzle is determined by using the exhaust flow rate, the urea injection time is determined according to the delay duration, the delay of exhaust from the pressure difference sensor to the urea nozzle is considered when urea is injected, the influence of the delay on the injection of urea is avoided, so that the timing of the injection of urea is more accurate, and the problem of uneven mixing of gas, crystallization or poor emission adaptability caused by the difference in the timing of the injection of urea is reduced.

[0109] In another embodiment provided by the application, the first acquisition unit 501 of the device comprises:

[0110] The first determination subunit is configured to determine the fuel flow of the vehicle.

[0111] The processing subunit is configured to process the intake flow and the fuel flow to obtain an ideal exhaust flow value corresponding to the intake flow.

[0112] In another embodiment provided by the application, the device further comprises:

[0113] The second acquisition unit is configured to acquire the engine speed of the vehicle.

[0114] The third acquisition unit is configured to acquire the pressure difference value of the pressure difference sensor.

[0115] The fourth determination unit is configured to apply the engine speed and the pressure difference value to determine the exhaust flow of the pressure difference sensor of the vehicle in a preset exhaust flow table.

[0116] In another embodiment provided by the application, the second determination unit 503 of the device comprises:

[0117] The second determination subunit is configured to determine the first distance between the air pressure sensor and the pressure difference sensor.

[0118] A first operation sub-unit is configured to operate the exhaust lag duration and the first distance to obtain an exhaust flow rate of the vehicle.

[0119] In another embodiment, the third determination unit 504 of the device comprises:

[0120] A third determination sub-unit is configured to determine a second distance between the differential pressure sensor and the urea nozzle.

[0121] A second operation sub-unit is configured to operate the exhaust flow rate and the second distance to obtain a delay duration of the exhaust gas from the differential pressure sensor to the urea nozzle of the vehicle.

[0122] In another embodiment, the control unit 505 of the device comprises:

[0123] A third operation sub-unit is configured to add the delay duration and the target time to obtain a urea injection time.

[0124] The embodiments of the present application also provide a storage medium, which comprises stored instructions, wherein the instructions, when executed, control a device where the storage medium is located to execute the urea injection control method.

[0125] The embodiments of the present application also provide an electronic device, a structure diagram of which is shown in Figure 6 The electronic device specifically comprises a memory 601 and one or more instructions 602, wherein the one or more instructions 602 are stored in the memory 601 and configured to be executed by one or more processors 603 to execute the urea injection control method.

[0126] It should be noted that the information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of the related data need to comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0127] The specific implementation process of each of the above embodiments and its derivative mode are all within the protection scope of the present application.

[0128] The various embodiments described in this specification are described in progressive order of complexity, from the simplest embodiment to more complex embodiments. Identify commonalities in the various embodiments so that the disclosure is not redundant. Each embodiment is directed to the differences between that embodiment and the other embodiments. In particular, the system or system embodiments are described more simply because they are substantially similar to the method embodiments. The system or system embodiments are described with reference to the method embodiments. The systems and system embodiments described above are merely illustrative of the principles of this application. Any feature in a drawing figure can be implemented in either hardware or software, or a combination thereof, and one skilled in the art would understand that the features of the examples described in connection with the embodiments disclosed herein can be carried out by electronic hardware, computer software, or combinations of both. The various illustrative components, as well as the implementations of the illustrative components, are intended to be merely illustrative. Their particular implementations as described are not intended to limit the scope of the embodiments to those particular implementations. One of ordinary skill in the art will understand that the functions of the various elements could be carried out by different components as long as the functions are carried out. The various illustrative components, methods, etc. described in connection with the embodiments disclosed herein can be implemented or performed with one or more computer systems capable of carrying out the computation or processing functions described herein. It will be appreciated that such a system, or any of its attendant elements, can be configured to operate as a processing system for implementing the functions described herein. Such a system can be a general purpose computer system that is programmed to carry out the functions described herein, or it can be a special purpose computer system that is programmed to carry out the functions described herein, or it can be a computer system that is programmed to carry out the functions described herein and is also programmed to carry out other functions as well. In other words, at least some of the elements of the disclosed embodiments, or variants thereof, can take the form of a computer program or a program product. Such program product can include a computer readable storage medium having stored thereon instructions that can be used to program a computer system or other electronic device to implement the processes described herein. The program product can include packaged software, distributed software, or software defined by a user as desired (e.g., for a particular customer). Accordingly, a many-to-one correspondence exists between the program product and the computer system or other electronic device that is programmed to implement the processes described herein. The one-to-many correspondence exists between the software and its user.

[0129] Those skilled in the art will further appreciate that the individual steps of the examples described in connection with the embodiments disclosed herein can be embodied in electronic hardware, computer software, or combinations of both. The various illustrative components, as well as the implementations of the illustrative components, are intended to be merely illustrative. Their particular implementations as described are not intended to limit the scope of the embodiments to those particular implementations. One of ordinary skill in the art will understand that the functions of the various elements could be carried out by different components as long as the functions are carried out. The various illustrative components, methods, etc. described in connection with the embodiments disclosed herein can be implemented or performed with one or more computer systems capable of carrying out the computation or processing functions described herein. It will be appreciated that such a system, or any of its attendant elements, can be configured to operate as a processing system for implementing the functions described herein. Such a system can be a general purpose computer system that is programmed to carry out the functions described herein, or it can be a special purpose computer system that is programmed to carry out the functions described herein, or it can be a computer system that is programmed to carry out the functions described herein and is also programmed to carry out other functions as well. In other words, at least some of the elements of the disclosed embodiments, or variants thereof, can take the form of a computer program or a program product. Such program product can include a computer readable storage medium having stored thereon instructions that can be used to program a computer system or other electronic device to implement the processes described herein. The program product can include packaged software, distributed software, or software defined by a user as desired (e.g., for a particular customer). Accordingly, a many-to-one correspondence exists between the program product and the computer system or other electronic device that is programmed to implement the processes described herein. The one-to-many correspondence exists between the software and its user.

[0130] The above description of disclosed embodiments is not intended to be exhaustive or to be assumed to represent the only embodiments of the present application. Various modifications of the disclosed embodiments, as well as other embodiments of the present application, which are intended to be encompass

Claims

1. A urea injection control method characterized by comprising: The method comprises: acquiring an intake flow rate detected by an air pressure sensor of a vehicle, and determining an exhaust flow rate ideal value corresponding to the intake flow rate; when an exhaust flow rate of a differential pressure sensor of the vehicle reaches the exhaust flow rate ideal value, determining a target time and an exhaust lag time length; the target time is a time when the exhaust flow rate of the differential pressure sensor reaches the exhaust flow rate ideal value; the exhaust lag time length is a time length required from determining the exhaust flow rate ideal value to the exhaust flow rate of the differential pressure sensor reaching the exhaust flow rate ideal value; applying the exhaust lag time length to determine an exhaust flow rate of the vehicle; applying the exhaust flow rate to determine a delay time length of exhaust gas of the vehicle from the differential pressure sensor to a urea nozzle of the vehicle; based on the delay time length and the target time, determining a urea injection time, and controlling the urea nozzle of the vehicle to inject urea according to the urea injection time; wherein the determination of the exhaust flow rate ideal value corresponding to the intake flow rate comprises: determining a fuel flow rate of the vehicle; processing the intake flow rate and the fuel flow rate to obtain the exhaust flow rate ideal value corresponding to the intake flow rate.

2. The method of claim 1, wherein, The determination process of the exhaust flow rate of the differential pressure sensor of the vehicle comprises: acquiring an engine speed of the vehicle; acquiring a differential pressure value of the differential pressure sensor; applying the engine speed and the differential pressure value to determine the exhaust flow rate of the differential pressure sensor of the vehicle in a preset exhaust flow rate table.

3. The method of claim 1, wherein, The application of the exhaust lag time length to determine the exhaust flow rate of the vehicle comprises: determining a first distance between the air pressure sensor and the differential pressure sensor; operating the exhaust lag time length and the first distance to obtain the exhaust flow rate of the vehicle.

4. The method of claim 1, wherein, The application of the exhaust flow rate to determine the delay time length of the exhaust gas of the vehicle from the differential pressure sensor to the urea nozzle of the vehicle comprises: determining a second distance between the differential pressure sensor and the urea nozzle; operating the exhaust flow rate and the second distance to obtain the delay time length of the exhaust gas of the vehicle from the differential pressure sensor to the urea nozzle of the vehicle.

5. The method of claim 1, wherein, The determination of the urea injection time based on the delay time length and the target time comprises: performing addition operation on the delay time length and the target time to obtain the urea injection time.

6. A urea injection control device for carrying out the method according to any one of claims 1 to 5, characterized in that The method comprises: a first acquisition unit configured to acquire an intake flow rate detected by an air pressure sensor of a vehicle, and determine an exhaust flow rate ideal value corresponding to the intake flow rate; a first determination unit configured to, when an exhaust flow rate of a differential pressure sensor of the vehicle reaches the exhaust flow rate ideal value, determine a target time and an exhaust lag time length; the target time is a time when the exhaust flow rate of the differential pressure sensor reaches the exhaust flow rate ideal value; the exhaust lag time length is a time length required from determining the exhaust flow rate ideal value to the exhaust flow rate of the differential pressure sensor reaching the exhaust flow rate ideal value; a second determination unit configured to apply the exhaust lag time length to determine an exhaust flow rate of the vehicle; a third determination unit configured to apply the exhaust flow rate to determine a delay time length of exhaust gas of the vehicle from the differential pressure sensor to a urea nozzle of the vehicle; A control unit is configured to determine a urea injection time based on the delay duration and the target time, and control a urea nozzle of the vehicle to inject urea according to the urea injection time.

7. The apparatus of claim 6, wherein, The first obtaining unit comprises: A first determining sub-unit is configured to determine a fuel flow of the vehicle; A processing sub-unit is configured to process the intake flow and the fuel flow to obtain an ideal exhaust flow value corresponding to the intake flow.

8. A storage medium, characterized by The storage medium comprises stored instructions, wherein the instructions, when executed, control a device in which the storage medium is located to perform the urea injection control method according to any one of claims 1-5.

9. An electronic device, comprising: A non-transitory computer-readable medium comprising a memory and one or more instructions stored therein, the one or more instructions being configured to, when executed by one or more processors, perform the urea injection control method according to any one of claims 1-5.

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