Method, device, storage medium and electronic equipment for controlling NOx conversion

Abstract

The application provides a NOx conversion control method and device, a storage medium and an electronic device, and is applied to a controller in a double-SCR aftertreatment system. The method comprises the following steps: in the case that the working mode of a front-stage SCR in the double-SCR aftertreatment system is an efficiency control mode, determining whether the state of a target vehicle is a parking state, and in the case that the state of the target vehicle is the parking state, switching the working mode of the front-stage SCR from the efficiency control mode to a closed-loop control mode; in the case that the front-stage SCR is in the closed-loop control mode, supplementing ammonia storage inside the front-stage SCR, and using the supplemented ammonia storage to convert NOx when the target vehicle is started again after parking. Through the judgment of the vehicle speed, in the case that the vehicle speed is less than a set speed, the ammonia storage inside the front-stage SCR is rapidly supplemented, and after the engine is stopped and started again, there is sufficient ammonia storage inside the front-stage SCR, so that the low-temperature NOx conversion capacity of the system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of NOx conversion, in particular to a control method and device for NOx conversion, a storage medium and an electronic device. BACKGROUND

[0002] In the dual selective catalytic reduction technology aftertreatment system scheme, when the engine operates in a high-speed high-load working condition, the front SCR, i.e., the selective catalytic reduction technology, will work in an efficiency control mode, at which time the working efficiency of the catalyst will be equal to the set efficiency, and the set efficiency is less than 100%. If the efficiency control mode works for a long time, the ammonia storage inside the catalyst will be continuously consumed, and after working for a period of time, the ammonia storage will be completely consumed. If the engine stops at this time, the aftertreatment system will be in a cold start stage when it is started next time, and at this time, there is no ammonia storage inside the catalyst, and the low-temperature NOx emission will increase. SUMMARY

[0003] The main purpose of the present application is to provide a control method and device for NOx conversion, a storage medium and an electronic device, so as to at least solve the problem of increased low-temperature NOx emission due to no ammonia storage inside the catalyst when the engine stops and starts again.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a control method for NOx conversion is provided, which is applied to a controller in a dual SCR aftertreatment system, the dual SCR aftertreatment system further comprising a front SCR and a rear SCR, and the method comprises: in the case that the working mode of the front SCR in the dual SCR aftertreatment system is an efficiency control mode, determining whether the state of a target vehicle is a desired parking state, wherein the desired parking state is a state in which the target vehicle will be parked in a preset time period, and the efficiency control mode is a mode in which the working efficiency of the front SCR will be equal to the set efficiency; in the case that the state of the target vehicle is the desired parking state, switching the working mode of the front SCR from the efficiency control mode to a closed-loop control mode, wherein the closed-loop control mode is a mode in which the ammonia storage inside the front SCR is controlled in a closed loop; and in the case that the front SCR is in the closed-loop control mode, supplementing the ammonia storage inside the front SCR, and using the supplemented ammonia storage to convert the NOx when the target vehicle is started again after being parked.

[0005] Optionally, determining whether the state of the target vehicle is the desired parking state comprises: in the case that the real-time vehicle speed of the target vehicle is less than a vehicle speed set limit value, determining that the state of the target vehicle is the desired parking state; and in the case that the real-time vehicle speed of the target vehicle is greater than or equal to the vehicle speed set limit value, determining that the state of the target vehicle is a non-desired parking state.

[0006] Optionally, after switching the working mode of the front SCR from the efficiency control mode to the closed-loop control mode, the method further comprises: acquiring the real-time vehicle speed of the target vehicle multiple times over time in the closed-loop control mode; and keeping the working mode of the front SCR as the closed-loop control mode if the real-time vehicle speed is less than or equal to the vehicle speed set limit.

[0007] Optionally, after switching the working mode of the front SCR from the efficiency control mode to the closed-loop control mode, the method further comprises: acquiring the inlet temperature of the dual-SCR aftertreatment system if the acquired real-time vehicle speed of the target vehicle is greater than the vehicle speed set limit; determining whether the inlet temperature is greater than a temperature set limit; switching the working mode of the front SCR from the closed-loop control mode to the efficiency control mode if the inlet temperature is greater than the temperature set limit; and keeping the working mode of the front SCR as the closed-loop control mode if the inlet temperature is less than or equal to the temperature set limit.

[0008] Optionally, the method further comprises: acquiring the power of an engine of the target vehicle and the displacement of the engine; and determining the vehicle speed set limit according to the power and the displacement.

[0009] Optionally, the method further comprises: acquiring the internal combustion temperature of an engine of the target vehicle, the displacement of the engine, and the rotation speed of the engine; and determining the temperature set limit according to the internal combustion temperature, the displacement, and the rotation speed.

[0010] Optionally, after supplementing the ammonia storage inside the front SCR while the front SCR is in the closed-loop control mode, the method further comprises: determining whether the real-time ammonia storage value of the front SCR is less than an ammonia storage set limit after a preset time period; and supplementing the ammonia storage inside the front SCR again if the real-time ammonia storage value of the front SCR is less than the ammonia storage set limit.

[0011] According to another aspect of this application, a NOx conversion control device is provided. The device is applied to a controller in a dual-SCR aftertreatment system, which further includes a pre-stage SCR and a post-stage SCR. The device comprises: a determining unit, configured to determine whether a target vehicle is in a state of impending parking when the pre-stage SCR in the dual-SCR aftertreatment system is operating in an efficiency control mode; wherein the impending parking state is a state in which the target vehicle will park for a preset time period, and the efficiency control mode is a mode in which the operating efficiency of the pre-stage SCR is equal to a set efficiency; a switching unit, configured to switch the operating mode of the pre-stage SCR from the efficiency control mode to a closed-loop control mode when the target vehicle is in the impending parking state; the closed-loop control mode is a mode that performs closed-loop control of the ammonia storage inside the pre-stage SCR; and a replenishing unit, configured to replenish the ammonia storage inside the pre-stage SCR when the pre-stage SCR is in the closed-loop control mode, and use the replenished ammonia storage to convert NOx when the target vehicle restarts after parking.

[0012] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform any of the NOx conversion control methods described above.

[0013] According to another aspect of this application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including methods for performing any of the NOx conversion control methods described above.

[0014] Applying the technical solution of this application, when the operating mode of the pre-stage SCR in the dual SCR aftertreatment system is efficiency control mode, it is determined whether the target vehicle is in a state of impending shutdown. If the target vehicle is in a state of impending shutdown, the operating mode of the pre-stage SCR is switched from efficiency control mode to closed-loop control mode. While the pre-stage SCR is in closed-loop control mode, the ammonia reservoir inside the pre-stage SCR is replenished. The replenished ammonia reservoir is then used to convert NOx when the target vehicle restarts after stopping. By judging the vehicle speed, if the vehicle speed is lower than the set speed, the ammonia reservoir inside the pre-stage SCR is rapidly replenished. After the engine stops and restarts, the pre-stage SCR has sufficient ammonia reservoir, improving the system's low-temperature NOx conversion capability. Attached Figure Description

[0015] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. The embodiments of the application, together with its

[0016] Figure 1 A hardware structure block diagram of a mobile terminal for performing a control method of NOx conversion according to an embodiment of the present application is shown;

[0017] Figure 2 A flowchart of a control method of NOx conversion according to an embodiment of the present application is shown;

[0018] Figure 3 A step flowchart of a pre-SCR in a closed-loop control mode according to an embodiment of the present application is shown;

[0019] Figure 4 A step flowchart of whether a pre-SCR in a closed-loop control mode is switched to an efficiency mode according to an embodiment of the present application is shown;

[0020] Figure 5 A technical solution flowchart of a control method of NOx conversion according to an embodiment of the present application is shown;

[0021] Figure 6 A structure block diagram of a control device of NOx conversion according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other under the condition of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative work should belong to the protection scope of the present application.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] For ease of description, the following explains some of the nouns or terms used in the embodiments of this application:

[0026] ccSCR: In a dual-SCR system, it refers to the front-stage SCR. A dual-SCR system has two SCR catalysts, one before and one after.

[0027] As described in the background section, in the prior art, when an engine is stopped and restarted, the low-temperature NOx emissions increase because there is no ammonia storage inside the catalyst. To solve the problem of increased low-temperature NOx emissions when an engine is stopped and restarted due to the lack of ammonia storage inside the catalyst, embodiments of this application provide a NOx conversion control method, apparatus, storage medium, and electronic device.

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a NOx conversion control method according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0030] The memory 104 can be used to store computer programs, such as software programs of application software and modules, such as a computer program corresponding to the NOx conversion control method of the embodiments of the present application. The processor 102 can execute various functional applications and data processing, i.e., implement the above-mentioned method, by running the computer programs stored in the memory 104. The memory 104 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include memories disposed remotely with respect to the processor 102, which can be connected to the mobile terminal through a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof. The transmission device 106 is used to receive or send data via a network. The specific examples of the above-mentioned network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (NIC), which can be connected to other network devices through a base station so as to be able to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner.

[0031] In the embodiments, a NOx conversion control method running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown.

[0032] Figure 2 is a flowchart of the NOx conversion control method according to the embodiments of the present application. As shown in Figure 2 , the method is applied to a controller in a dual-SCR aftertreatment system, which further includes a front SCR and a rear SCR, and includes the following steps:

[0033] In step S201, in a case where the working mode of the front SCR in the dual-SCR aftertreatment system is an efficiency control mode, it is determined whether the state of the target vehicle is a parking intended state, wherein the parking intended state is a state in which the target vehicle will be parked in a preset time period, and the efficiency control mode is a mode in which the working efficiency of the front SCR will be equal to a set efficiency.

[0034] In the efficiency mode, the working efficiency of the ccSCR will work at a set efficiency, and the set efficiency is lower than 100%.

[0035] Specifically, whether the target vehicle will stop is determined by judging whether the target vehicle state is a stop state.

[0036] In step S202, when the target vehicle state is a stop state, the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode, wherein the closed-loop control mode is a mode of closed-loop control of the ammonia storage in the front SCR.

[0037] Specifically, the closed-loop control mode refers to a mode of closed-loop control of the content of the ammonia storage in the front SCR.

[0038] In step S203, when the front SCR is in the closed-loop control mode, the ammonia storage in the front SCR is supplemented, and the supplemented ammonia storage is used to convert NOx when the target vehicle is started again after stopping.

[0039] Specifically, when the front SCR is in the closed-loop control mode, it is determined that the target vehicle may stop, and then the ammonia storage in the front SCR is quickly supplemented to ensure that there is sufficient ammonia storage in the front SCR to convert nitrogen oxides NOx when the target vehicle is started again after stopping.

[0040] In this embodiment, when the working mode of the front SCR in the dual-SCR aftertreatment system is the efficiency control mode, it is determined whether the target vehicle state is a stop state, and when the target vehicle state is a stop state, the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode. When the front SCR is in the closed-loop control mode, the ammonia storage in the front SCR is supplemented, and the supplemented ammonia storage is used to convert NOx when the target vehicle is started again after stopping. By judging the vehicle speed, when the vehicle speed is less than the set speed, the ammonia storage in the front SCR is quickly supplemented, and the engine is started again after stopping. There is sufficient ammonia storage in the front SCR, and the low-temperature NOx conversion capability of the system is improved.

[0041] In the specific implementation process, step S201 determines whether the target vehicle state is a stop state, comprising:

[0042] When the real-time vehicle speed of the target vehicle is less than the vehicle speed set limit, it is determined that the target vehicle state is a stop state; when the real-time vehicle speed of the target vehicle is greater than or equal to the vehicle speed set limit, it is determined that the target vehicle state is a non-stop state.

[0043] The size of the vehicle speed set limit needs to be set close to the state of the target vehicle stopping at a speed of 0, for example, the vehicle speed set limit can be set to 10 km / h, 5 km / h, 3 km / h.

[0044] The method adds a vehicle speed setting limit value to compare with the real-time vehicle speed of the target vehicle, so as to determine whether the target vehicle is in the desired stop state.

[0045] Specifically, after the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode at step S202, the method further comprises the following steps as shown in the figure: Figure 3

[0046] At step S301, the real-time vehicle speed of the target vehicle is obtained multiple times over time in the closed-loop control mode.

[0047] At step S302, if the real-time vehicle speed is less than or equal to the vehicle speed setting limit value, the working mode of the front SCR is kept in the closed-loop control mode.

[0048] The method obtains the real-time vehicle speed of the target vehicle multiple times when the working mode of the front SCR is in the closed-loop control mode, to determine whether the working mode of the front SCR needs to be changed.

[0049] Further, after the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode, the method further comprises the following steps as shown in the figure: Figure 4

[0050] At step S401, if the obtained real-time vehicle speed of the target vehicle is greater than the vehicle speed setting limit value, the inlet temperature of the dual-SCR aftertreatment system is obtained.

[0051] At step S402, it is determined whether the inlet temperature is greater than a temperature setting value.

[0052] At step S403, if the inlet temperature is greater than the temperature setting value, the working mode of the front SCR is switched from the closed-loop control mode to the efficiency control mode.

[0053] At step S404, if the inlet temperature is less than or equal to the temperature setting value, the working mode of the front SCR is kept in the closed-loop control mode.

[0054] For example, the inlet temperature when the working mode of the front SCR is in the efficiency control mode is 400°C, and the inlet temperature when the working mode of the front SCR is in the closed-loop control mode is 150°C, and the temperature setting value can be set to 250°C.

[0055] By comparing the inlet temperature of the dual-SCR aftertreatment system with the temperature setting value, and judging whether to switch the working mode of the front SCR from the closed-loop control mode to the efficiency control mode according to the comparison result, it can be prevented that the ccSCR control mode is switched frequently when the real-time vehicle speed is rapidly transitioned near the vehicle speed setting limit value.

[0056] ​​Further, the method further comprises: obtaining the power of the engine of the target vehicle and the displacement of the engine; and determining the vehicle speed setting limit value according to the power and the displacement.

[0057] The power and the displacement of the engine corresponding to different vehicles are different, and the size of the vehicle speed setting limit value can be determined according to the power and the displacement of the engine.

[0058] Specifically, the method further comprises: obtaining the internal combustion temperature of the engine of the target vehicle, the displacement of the engine and the rotating speed of the engine; and determining the temperature setting value according to the internal combustion temperature, the displacement and the rotating speed.

[0059] The inlet temperature of the dual-SCR aftertreatment system of different vehicles in various states is also different, and the internal combustion temperature of the engine, the displacement of the engine and the rotating speed of the engine can be used to determine the temperature setting value of the appropriate inlet temperature.

[0060] More specifically, after the ammonia storage in the front-stage SCR is supplemented in the closed-loop control mode, the method further comprises: determining whether the real-time ammonia storage value of the front-stage SCR is less than the ammonia storage setting value after a preset time period; and supplementing the ammonia storage in the front-stage SCR again in the case that the real-time ammonia storage value of the front-stage SCR is less than the ammonia storage setting value.

[0061] The ammonia storage setting value can be set to 40%, 30% or 20%.

[0062] Specifically, the ammonia storage in the front-stage SCR will also be consumed in the case that the vehicle speed of the target vehicle is less than the vehicle speed setting limit value for a long time. In order to avoid the problem that the front-stage SCR is always in the closed-loop control mode and the ammonia storage in the front-stage SCR is consumed, the ammonia storage setting value is added; and the ammonia storage in the front-stage SCR is supplemented again in the case that the front-stage SCR is always in the closed-loop control mode and the ammonia storage in the front-stage SCR is lower than the ammonia storage setting value.

[0063] In order to enable those skilled in the art to more clearly understand the technical solutions of the present application, the implementation process of the NOx conversion control method of the present application will be described in detail below in combination with specific embodiments.

[0064] The present embodiment relates to a specific NOx conversion control method, as shown in Figure 5 ;

[0065] When the engine operates under high-speed, high-load conditions, in a dual-SCR aftertreatment system, the front-stage CCSCR will operate in efficiency control mode. In this mode, the CCSCR will operate at a set efficiency, below 100%. If it operates in efficiency mode for an extended period, the ammonia reserve inside the CCSCR will be continuously depleted, eventually becoming completely empty. If the engine is then stopped and cooled down, the aftertreatment system will be in a cold start phase upon restarting. Since there is no ammonia reserve inside the CCSCR at this time, low-temperature NOx emissions will increase.

[0066] like Figure 5 As shown, when the CCSCR is operating in efficiency mode, if the vehicle speed information is normal, when the vehicle speed is detected to be lower than the set minimum speed limit V1, the CCSCR control mode is switched from efficiency mode to closed-loop control mode. The purpose of setting the speed limit V1 is to determine whether the vehicle will shut down. When the vehicle is operating under high-speed and high-load conditions, if it needs to shut down, the vehicle speed will gradually decrease from high to 0.

[0067] In closed-loop control mode, the ammonia storage inside the CCSCR is rapidly replenished, and the ammonia storage value can meet the set ammonia storage requirement in a very short time. If the vehicle stops and the engine is turned off to cool down, upon restarting, because there is already some ammonia stored inside the CCSCR, this ammonia will effectively improve the low-temperature NOx conversion capacity and reduce NOx emission levels.

[0068] like Figure 5 As shown, during closed-loop operation, if the aftertreatment inlet temperature exceeds the temperature threshold T1 and the vehicle speed exceeds the speed limit V1, the driver is deemed to have no need to shut off the engine. To prevent frequent switching of the cCSCR control mode due to rapid transitions in actual vehicle speed near the speed limit, an aftertreatment temperature threshold T1 is set, and the cCSCR control mode is switched only when the aftertreatment inlet temperature exceeds T1.

[0069] By judging the vehicle speed, when the vehicle speed is lower than the set speed, the ammonia storage in the front-stage SCR is quickly replenished. After the engine stops and restarts, there is sufficient ammonia storage in the front-stage SCR, which improves the system's low-temperature NOx conversion capacity.

[0070] The embodiment of the present application further provides a control device for NOx conversion. It should be noted that the control device for NOx conversion of the embodiment of the present application can be used to execute the control method for NOx conversion provided by the embodiment of the present application. The device is used to realize the above-mentioned embodiment and preferred embodiment, and the description has been made above. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiment is preferably realized in software, the realization of hardware, or a combination of software and hardware, is also possible and conceived.

[0071] The control device for NOx conversion provided by the embodiment of the present application is introduced below.

[0072] Figure 6 is a schematic diagram of the control device for NOx conversion according to the embodiment of the present application. As shown in Figure 6 , the device is applied to a controller in a dual-SCR aftertreatment system, and the dual-SCR aftertreatment system further includes a front SCR and a rear SCR, and includes:

[0073] The first determination unit 61 is configured to determine whether the state of the target vehicle is a parking-desired state in the case that the working mode of the front SCR in the dual-SCR aftertreatment system is an efficiency control mode, wherein the parking-desired state is a state in which the target vehicle will be parked in a preset time period, and the efficiency control mode is a mode in which the working efficiency of the front SCR will be equal to a set efficiency.

[0074] The efficiency mode is a mode in which the working efficiency of the ccSCR will work at a set efficiency, and the set efficiency is lower than 100%.

[0075] Specifically, whether the target vehicle will be parked is determined by judging whether the state of the target vehicle is a parking-desired state.

[0076] The first switching unit 62 is configured to switch the working mode of the front SCR from the efficiency control mode to a closed-loop control mode in the case that the state of the target vehicle is a parking-desired state, and the closed-loop control mode is a mode in which the ammonia storage inside the front SCR is controlled in a closed loop.

[0077] Specifically, the closed-loop control mode refers to a mode in which the content of the ammonia storage inside the front SCR is controlled in a closed loop.

[0078] The first supplement unit 63 is configured to supplement the ammonia storage inside the front SCR in the case that the front SCR is in the closed-loop control mode, and the supplemented ammonia storage is used to convert NOx when the target vehicle is started again after parking.

[0079] Specifically, when the front SCR is in the closed-loop control mode, it is determined that the target vehicle is likely to be parked, and then the ammonia storage in the front SCR is quickly supplemented to ensure that there is sufficient ammonia storage in the front SCR to convert nitrogen oxides NOx when the target vehicle is started again after parking.

[0080] In this embodiment, the first determining unit is configured to determine whether the target vehicle is in a parking state when the working mode of the front SCR in the dual-SCR aftertreatment system is in the efficiency control mode; the first switching unit is configured to switch the working mode of the front SCR from the efficiency control mode to the closed-loop control mode when the target vehicle is in the parking state; and the first supplementing unit is configured to supplement the ammonia storage in the front SCR when the front SCR is in the closed-loop control mode, and convert NOx when the target vehicle is started again after parking by using the supplemented ammonia storage. By judging the vehicle speed, the ammonia storage in the front SCR is quickly supplemented when the vehicle speed is less than a set vehicle speed, and there is sufficient ammonia storage in the front SCR when the engine is stopped and started again, thereby improving the low-temperature NOx conversion capability of the system.

[0081] As an optional solution, the first determining unit comprises a first determining module and a second determining module.

[0082] The first determining module is configured to determine that the target vehicle is in the parking state when the real-time vehicle speed of the target vehicle is less than a set vehicle speed limit; and the second determining module is configured to determine that the target vehicle is not in the parking state when the real-time vehicle speed of the target vehicle is greater than or equal to the set vehicle speed limit.

[0083] The device compares the real-time vehicle speed of the target vehicle with the set vehicle speed limit to determine whether the target vehicle is in the parking state.

[0084] As an optional solution, the device further comprises a first obtaining unit and a first maintaining unit.

[0085] The first obtaining unit is configured to obtain the real-time vehicle speed of the target vehicle multiple times over time in the closed-loop control mode after the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode; and the maintaining unit is configured to maintain the working mode of the front SCR as the closed-loop control mode when the real-time vehicle speed is less than or equal to the set vehicle speed limit.

[0086] The device obtains the real-time vehicle speed of the target vehicle multiple times when the working mode of the front SCR is in the closed-loop control mode to determine whether the working mode of the front SCR needs to be changed.

[0087] As an optional solution, the device further comprises a second obtaining unit, a second determining unit, a second switching unit and a second maintaining unit.

[0088] The second acquisition unit is configured to acquire the inlet temperature of the dual-SCR aftertreatment system when the real-time vehicle speed of the target vehicle is greater than the vehicle speed setting limit after the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode; the second determination unit is configured to determine whether the inlet temperature is greater than the temperature setting value; the second switching unit is configured to switch the working mode of the front SCR from the closed-loop control mode to the efficiency control mode when the inlet temperature is greater than the temperature setting value; and the second maintaining unit is configured to maintain the working mode of the front SCR as the closed-loop control mode when the inlet temperature is less than or equal to the temperature setting value.

[0089] Specifically, by comparing the inlet temperature of the dual-SCR aftertreatment system with the temperature setting value, whether to switch the working mode of the front SCR from the closed-loop control mode to the efficiency control mode is determined according to the comparison result, so that the frequent switching of the ccSCR control mode caused by the rapid transition of the real-time vehicle speed near the vehicle speed setting limit can be prevented.

[0090] In an optional solution, the device further comprises a third acquisition unit and a third determination unit.

[0091] The third acquisition unit is configured to acquire the power of the engine of the target vehicle and the displacement of the engine; and the third determination unit is configured to determine the vehicle speed setting limit according to the power and the displacement.

[0092] Specifically, the power and the displacement of the engine of different vehicles are also different, and the size of the vehicle speed setting limit can be determined according to the power and the displacement of the engine.

[0093] In an optional solution, the device further comprises a fourth acquisition unit and a fourth determination unit.

[0094] The fourth acquisition unit is configured to acquire the internal combustion temperature of the engine of the target vehicle, the displacement of the engine, and the rotating speed of the engine; and the fourth determination unit is configured to determine the temperature setting value according to the internal combustion temperature, the displacement, and the rotating speed.

[0095] Specifically, the inlet temperature of the dual-SCR aftertreatment system of different vehicles in various states is also different, and the internal combustion temperature of the engine, the displacement of the engine, and the rotating speed of the engine can be used to determine the temperature setting value of the appropriate inlet temperature.

[0096] In an optional solution, the device further comprises a fifth determination unit and a second supplement unit.

[0097] The fifth determining unit is configured to determine whether the real-time ammonia storage value of the front-stage SCR is less than the ammonia storage set value after a preset time period; and the second supplementing unit is configured to supplement the ammonia storage in the front-stage SCR again in the case that the real-time ammonia storage value of the front-stage SCR is less than the ammonia storage set value.

[0098] Specifically, the ammonia storage in the front-stage SCR is also consumed in the case that the vehicle speed of the target vehicle is less than the vehicle speed set limit for a long time, and the ammonia storage set value is added to avoid the problem that the front-stage SCR is always in the closed-loop control mode and the ammonia storage in the front-stage SCR is consumed out; the ammonia storage in the front-stage SCR is supplemented again in the case that the front-stage SCR is always in the closed-loop control mode and the ammonia storage in the front-stage SCR is less than the ammonia storage set value.

[0099] The control device for NOx conversion comprises a processor and a memory, the first determining unit, the first switching unit, the first supplementing unit and the like are stored in the memory as program units, and the corresponding functions are realized by the processor executing the program units stored in the memory. The modules are located in the same processor; or the modules are located in different processors in any combination.

[0100] The processor comprises a core, and the core calls the corresponding program units from the memory. The core can be one or more, and the problem of increased low-temperature NOx emission due to no ammonia storage in the catalyst when the engine is stopped and started again can be solved by adjusting the core parameters.

[0101] The memory can comprise a non-permanent memory in a computer readable medium, a random access memory (RAM) and / or a non-volatile memory such as a read-only memory (ROM) or a flash memory (flash RAM), and the memory comprises at least one memory chip.

[0102] The embodiment of the present application provides a computer readable storage medium, which comprises a stored program, wherein the device where the computer readable storage medium is located executes the control method for NOx conversion when the program runs.

[0103] Specifically, the control method for NOx conversion comprises:

[0104] In step S201, in the case that the working mode of the front-stage SCR in the dual-SCR aftertreatment system is the efficiency control mode, it is determined whether the state of the target vehicle is the desired parking state, wherein the desired parking state is the state that the target vehicle will be parked for a preset time period, and the efficiency control mode is the mode that the working efficiency of the front-stage SCR is equivalent to the set efficiency;

[0105] In step S202, when the state of the target vehicle is the state of being about to stop, the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode, wherein the closed-loop control mode is a mode of closed-loop control of the ammonia storage inside the front SCR.

[0106] In step S203, the ammonia storage inside the front SCR is supplemented when the front SCR is in the closed-loop control mode, and the supplemented ammonia storage is used to convert NOx when the target vehicle is started again after stopping.

[0107] Optionally, determining whether the state of the target vehicle is the state of being about to stop comprises: determining that the state of the target vehicle is the state of being about to stop when the real-time vehicle speed of the target vehicle is less than the vehicle speed setting limit; and determining that the state of the target vehicle is the state of not being about to stop when the real-time vehicle speed of the target vehicle is greater than or equal to the vehicle speed setting limit.

[0108] Optionally, after the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode, the method further comprises: acquiring the real-time vehicle speed of the target vehicle multiple times over time in the closed-loop control mode; and keeping the working mode of the front SCR as the closed-loop control mode when the real-time vehicle speed is less than or equal to the vehicle speed setting limit.

[0109] Optionally, after the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode, the method further comprises: acquiring the inlet temperature of the double-SCR aftertreatment system when the acquired real-time vehicle speed of the target vehicle is greater than the vehicle speed setting limit; determining whether the inlet temperature is greater than a temperature setting value; switching the working mode of the front SCR from the closed-loop control mode to the efficiency control mode when the inlet temperature is greater than the temperature setting value; and keeping the working mode of the front SCR as the closed-loop control mode when the inlet temperature is less than or equal to the temperature setting value.

[0110] Optionally, the method further comprises: acquiring the power of the engine of the target vehicle and the displacement of the engine; and determining the vehicle speed setting limit according to the power and the displacement.

[0111] Optionally, the method further comprises: acquiring the internal combustion temperature of the engine of the target vehicle, the displacement of the engine, and the rotation speed of the engine; and determining the temperature setting value according to the internal combustion temperature, the displacement, and the rotation speed.

[0112] Optionally, after the ammonia storage inside the front SCR is supplemented when the front SCR is in the closed-loop control mode, the method further comprises: determining whether the real-time ammonia storage value of the front SCR is less than an ammonia storage setting value after a preset time period; and supplementing the ammonia storage inside the front SCR again when the real-time ammonia storage value of the front SCR is less than the ammonia storage setting value.

[0113] The embodiment of the present application provides a processor used for running a program, wherein the control method for NOx conversion is executed when the program runs.

[0114] Specifically, the control method for NOx conversion comprises:

[0115] In step S201, in the case that the working mode of the front SCR in the dual-SCR aftertreatment system is the efficiency control mode, it is determined whether the state of the target vehicle is the parking intention state, wherein the parking intention state is the state that the target vehicle will be parked in the preset time period, and the efficiency control mode is the mode that the working efficiency of the front SCR is equivalent to the set efficiency;

[0116] In step S202, in the case that the state of the target vehicle is the parking intention state, the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode, wherein the closed-loop control mode is the mode that the ammonia storage in the front SCR is controlled in a closed loop;

[0117] In step S203, in the case that the front SCR is in the closed-loop control mode, the ammonia storage in the front SCR is supplemented, and the NOx is converted when the target vehicle is started again after parking by using the supplemented ammonia storage.

[0118] Optionally, the determination of whether the state of the target vehicle is the parking intention state comprises: in the case that the real-time vehicle speed of the target vehicle is less than the vehicle speed set limit value, it is determined that the state of the target vehicle is the parking intention state; and in the case that the real-time vehicle speed of the target vehicle is greater than or equal to the vehicle speed set limit value, it is determined that the state of the target vehicle is the non-parking intention state.

[0119] Optionally, after the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode, the method further comprises: in the closed-loop control mode, the real-time vehicle speed of the target vehicle is acquired multiple times over time; and in the case that the real-time vehicle speed is less than or equal to the vehicle speed set limit value, the working mode of the front SCR is kept as the closed-loop control mode.

[0120] Optionally, after the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode, the method further comprises: in the case that the acquired real-time vehicle speed of the target vehicle is greater than the vehicle speed set limit value, the inlet temperature of the dual-SCR aftertreatment system is acquired; it is determined whether the inlet temperature is greater than the temperature set value; in the case that the inlet temperature is greater than the temperature set value, the working mode of the front SCR is switched from the closed-loop control mode to the efficiency control mode; and in the case that the inlet temperature is less than or equal to the temperature set value, the working mode of the front SCR is kept as the closed-loop control mode.

[0121] Optionally, the method further comprises: acquiring the power of the engine of the target vehicle and the displacement of the engine; and determining the vehicle speed set limit value according to the power and the displacement.

[0122] Optionally, the method further comprises: obtaining an internal combustion temperature of an engine of the target vehicle, a displacement of the engine, and a rotation speed of the engine; determining the temperature set value according to the internal combustion temperature, the displacement, and the rotation speed.

[0123] Optionally, after supplementing the ammonia storage inside the front-stage SCR in the closed-loop control mode, the method further comprises: determining whether the real-time ammonia storage value of the front-stage SCR is less than the ammonia storage set value after a preset time period; and supplementing the ammonia storage inside the front-stage SCR again in the case that the real-time ammonia storage value of the front-stage SCR is less than the ammonia storage set value.

[0124] An apparatus is provided, the apparatus comprising a processor, a memory, and a program stored on the memory and executable on the processor, the processor implementing at least the following steps when executing the program:

[0125] Step S201, in the case that the working mode of the front-stage SCR in the dual-SCR aftertreatment system is the efficiency control mode, determining whether the state of the target vehicle is the parking-desired state, wherein the parking-desired state is a state that the target vehicle will be parked in a preset time period, and the efficiency control mode is a mode in which the working efficiency of the front-stage SCR will be equal to the set efficiency;

[0126] Step S202, in the case that the state of the target vehicle is the parking-desired state, switching the working mode of the front-stage SCR from the efficiency control mode to the closed-loop control mode, wherein the closed-loop control mode is a mode in which the ammonia storage inside the front-stage SCR is controlled in a closed loop;

[0127] Step S203, supplementing the ammonia storage inside the front-stage SCR in the case that the front-stage SCR is in the closed-loop control mode, and using the supplemented ammonia storage to convert the NOx when the target vehicle is started again after being parked.

[0128] The apparatus herein can be a server, a PC, a PAD, a mobile phone, etc.

[0129] Optionally, determining whether the state of the target vehicle is the parking-desired state comprises: in the case that the real-time vehicle speed of the target vehicle is less than the vehicle speed set limit value, determining that the state of the target vehicle is the parking-desired state; and in the case that the real-time vehicle speed of the target vehicle is greater than or equal to the vehicle speed set limit value, determining that the state of the target vehicle is the non-parking-desired state.

[0130] Optionally, after switching the working mode of the front-stage SCR from the efficiency control mode to the closed-loop control mode, the method further comprises: obtaining the real-time vehicle speed of the target vehicle multiple times over time in the closed-loop control mode; and in the case that the real-time vehicle speed is less than or equal to the vehicle speed set limit value, keeping the working mode of the front-stage SCR as the closed-loop control mode.

[0131] Optionally, after switching the working mode of the front SCR from the efficiency control mode to the closed-loop control mode, the method further comprises: in the case that the obtained real-time vehicle speed of the target vehicle is greater than the vehicle speed setting limit value, obtaining the inlet temperature of the dual-SCR aftertreatment system; determining whether the inlet temperature is greater than the temperature setting value; in the case that the inlet temperature is greater than the temperature setting value, switching the working mode of the front SCR from the closed-loop control mode to the efficiency control mode; in the case that the inlet temperature is less than or equal to the temperature setting value, keeping the working mode of the front SCR as the closed-loop control mode.

[0132] Optionally, the method further comprises: obtaining the power of the engine of the target vehicle and the displacement of the engine; and determining the vehicle speed setting limit value according to the power and the displacement.

[0133] Optionally, the method further comprises: obtaining the internal combustion temperature of the engine of the target vehicle, the displacement of the engine and the rotation speed of the engine; and determining the temperature setting value according to the internal combustion temperature, the displacement and the rotation speed.

[0134] Optionally, after supplementing the ammonia storage inside the front SCR in the closed-loop control mode, the method further comprises: determining whether the real-time ammonia storage value of the front SCR is less than the ammonia storage setting value after a preset time period; and in the case that the real-time ammonia storage value of the front SCR is less than the ammonia storage setting value, supplementing the ammonia storage inside the front SCR again.

[0135] The application also provides a computer program product adapted to execute a program which, when executed on a data processing device, is adapted to perform the following method steps:

[0136] Step S201, in the case that the working mode of the front SCR in the dual-SCR aftertreatment system is the efficiency control mode, determining whether the state of the target vehicle is a desired parking state, wherein the desired parking state is a state in which the target vehicle will be parked for a preset time period, and the efficiency control mode is a mode in which the working efficiency of the front SCR will be equal to a set efficiency;

[0137] Step S202, in the case that the state of the target vehicle is the desired parking state, switching the working mode of the front SCR from the efficiency control mode to the closed-loop control mode, wherein the closed-loop control mode is a mode in which the ammonia storage inside the front SCR is controlled in a closed loop;

[0138] Step S203, supplementing the ammonia storage inside the front SCR in the closed-loop control mode, and using the supplemented ammonia storage to convert NOx when the target vehicle is started again after parking.

[0139] Optionally, the determining whether the target vehicle is in the stop state comprises: determining that the target vehicle is in the stop state when a real-time vehicle speed of the target vehicle is less than a vehicle speed setting limit; and determining that the target vehicle is in a non-stop state when the real-time vehicle speed of the target vehicle is greater than or equal to the vehicle speed setting limit.

[0140] Optionally, after the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode, the method further comprises: acquiring the real-time vehicle speed of the target vehicle multiple times over time in the closed-loop control mode; and keeping the working mode of the front SCR as the closed-loop control mode when the real-time vehicle speed is less than or equal to a vehicle speed setting limit.

[0141] Optionally, after the working mode of the front SCR is switched from the efficiency control mode to the closed-loop control mode, the method further comprises: acquiring an inlet temperature of the dual-SCR aftertreatment system when the acquired real-time vehicle speed of the target vehicle is greater than the vehicle speed setting limit; determining whether the inlet temperature is greater than a temperature setting value; switching the working mode of the front SCR from the closed-loop control mode to the efficiency control mode when the inlet temperature is greater than the temperature setting value; and keeping the working mode of the front SCR as the closed-loop control mode when the inlet temperature is less than or equal to the temperature setting value.

[0142] Optionally, the method further comprises: acquiring a power of an engine of the target vehicle and a displacement of the engine; and determining the vehicle speed setting limit according to the power and the displacement.

[0143] Optionally, the method further comprises: acquiring an internal combustion temperature of the engine of the target vehicle, the displacement of the engine, and a rotation speed of the engine; and determining the temperature setting value according to the internal combustion temperature, the displacement, and the rotation speed.

[0144] Optionally, after the ammonia storage in the front SCR is supplemented when the front SCR is in the closed-loop control mode, the method further comprises: determining whether a real-time ammonia storage value of the front SCR is less than an ammonia storage setting value after a preset time period; and supplementing the ammonia storage in the front SCR again when the real-time ammonia storage value of the front SCR is less than the ammonia storage setting value.

[0145] It should be apparent to those skilled in the art that the modules or steps of the application described above can be implemented with a general purpose computer, and can be centralized in a single computer or distributed among a network of computers, and can be implemented with program code executable by a computer, and thus can be stored in a storage device and executed by a computer, and in some cases, the steps shown or described can be executed in a different order than shown or described, or can be implemented as separate integrated circuit modules or as a single integrated circuit module, and thus the application is not limited to any particular combination of hardware and software.

[0146] Those skilled in the art will appreciate that embodiments of the application can be devised for a method, a system, or a computer program product. Accordingly, the application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can be in the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk memory, CD-ROMs, optical storage media, etc.) embodying computer readable program code.

[0147] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0148] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0149] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart illustrations and / or block diagrams.Figure 1 one or more processes and / or functions specified in one or more blocks Figure 1 one or more processes and / or functions specified in one or more blocks

[0150] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0151] The memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) and / or cache memory, non-volatile memory, such as read-only memory (ROM), EPROM, and / or flash memory, etc. The memory is an example of computer readable media.

[0152] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD), or other optical storage, magnetic cassette, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0153] It should also be noted that the terms "comprising", "containing", or any other variant thereof, are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device that includes the element.

[0154] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0155] 1) The application is a kind of NOx conversion control method, the method is applied to the controller in double SCR aftertreatment system, the double SCR aftertreatment system also includes front SCR and rear SCR, comprising: in the case that the working mode of front SCR in double SCR aftertreatment system is efficiency control mode, determine whether the state of target vehicle is desire to stop state, wherein, the desire to stop state is the state that target vehicle will stop in the preset time period, the efficiency control mode is the mode that the working efficiency of front SCR will be equal to the set efficiency;In the case that the state of target vehicle is desire to stop state, switch the working mode of front SCR from efficiency control mode to closed loop control mode, wherein, the closed loop control mode is the mode that closed loop control the ammonia storage inside front SCR;In the case that front SCR is in closed loop control mode, supplement the ammonia storage inside front SCR, use the supplemented ammonia storage to convert NOx when target vehicle stops and starts again. Through the judgment of vehicle speed, in the case that the vehicle speed is less than the set speed, the ammonia storage inside front SCR is quickly supplemented, the engine stops and starts again, there is sufficient ammonia storage inside front SCR, which improves the low temperature NOx conversion capacity of the system.

[0156] 2) The application is a kind of NOx conversion control device, the device is applied to the controller in double SCR aftertreatment system, the double SCR aftertreatment system also includes front SCR and rear SCR, comprising: determination unit, for determining whether the state of target vehicle is desire to stop state in the case that the working mode of front SCR in double SCR aftertreatment system is efficiency control mode, wherein, the desire to stop state is the state that target vehicle will stop in the preset time period, the efficiency control mode is the mode that the working efficiency of front SCR will be equal to the set efficiency;Switching unit, for switching the working mode of front SCR from efficiency control mode to closed loop control mode in the case that the state of target vehicle is desire to stop state, the closed loop control mode is the mode that closed loop control the ammonia storage inside front SCR;Supplement unit, for supplementing the ammonia storage inside front SCR in the case that front SCR is in closed loop control mode, using the supplemented ammonia storage to convert NOx when target vehicle stops and starts again. Through the judgment of vehicle speed, in the case that the vehicle speed is less than the set speed, the ammonia storage inside front SCR is quickly supplemented, the engine stops and starts again, there is sufficient ammonia storage inside front SCR, which improves the low temperature NOx conversion capacity of the system.

[0157] The above only describes the preferred embodiments of the application, and is not intended to limit the application. Those skilled in the art can make various modifications and changes to the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method for controlling NOx conversion, characterized in that, The method is applied to the controller of a dual-SCR post-processing system, which further includes a pre-stage SCR and a post-stage SCR, comprising: When the operating mode of the front-stage SCR in the dual SCR aftertreatment system is the efficiency control mode, it is determined whether the target vehicle is in a state of wanting to stop. The state of wanting to stop is the state in which the target vehicle will stop within a preset time period. The efficiency control mode is the mode in which the operating efficiency of the front-stage SCR is equal to the set efficiency. When the target vehicle is in the state of wanting to stop, the operating mode of the front-stage SCR is switched from the efficiency control mode to the closed-loop control mode, wherein the closed-loop control mode is a mode for closed-loop control of the ammonia storage inside the front-stage SCR. When the pre-stage SCR is in the closed-loop control mode, the ammonia storage inside the pre-stage SCR is replenished, and the replenished ammonia storage is used to convert the NOx when the target vehicle is restarted after being stopped. After the ammonia storage inside the pre-stage SCR is replenished while the pre-stage SCR is in the closed-loop control mode, the method further includes: After a preset time period, determine whether the real-time ammonia storage value of the front-end SCR is less than the ammonia storage set value; If the real-time ammonia storage value of the preceding SCR is less than the ammonia storage set value, the ammonia storage inside the preceding SCR will be replenished again.

2. The method according to claim 1, characterized in that, Determining whether the target vehicle is in a parking state includes: If the real-time speed of the target vehicle is less than the set speed limit, the state of the target vehicle is determined to be the state of wanting to stop. If the real-time speed of the target vehicle is greater than or equal to the speed limit, the target vehicle is determined to be in a non-parking state.

3. The method according to claim 2, characterized in that, After switching the operating mode of the pre-stage SCR from the efficiency control mode to the closed-loop control mode, the method further includes: The real-time speed of the target vehicle is acquired multiple times over time in the closed-loop control mode. When the real-time vehicle speed is less than the set vehicle speed limit, the operating mode of the front-end SCR remains the closed-loop control mode.

4. The method according to claim 2, characterized in that, After switching the operating mode of the pre-stage SCR from the efficiency control mode to the closed-loop control mode, the method further includes: If the real-time speed of the target vehicle is greater than the speed limit, the inlet temperature of the dual SCR aftertreatment system is obtained. Determine whether the inlet temperature is greater than the set temperature value; If the inlet temperature is greater than the set temperature, the operating mode of the pre-stage SCR will be switched from the closed-loop control mode to the efficiency control mode. When the inlet temperature is less than or equal to the set temperature, the operating mode of the pre-stage SCR remains the closed-loop control mode.

5. The method according to claim 2, characterized in that, The method further includes: Obtain the engine power and engine displacement of the target vehicle; The vehicle speed setting limit is determined based on the power and the displacement.

6. The method according to claim 4, characterized in that, The method further includes: The internal combustion temperature of the engine of the target vehicle, the displacement of the engine, and the speed of the engine are obtained. The temperature setpoint is determined based on the internal combustion temperature, the displacement, and the rotational speed.

7. A control device for performing NOx conversion according to any one of claims 1-6, characterized in that, The device is used in the controller of a dual SCR post-processing system, which further includes a pre-stage SCR and a post-stage SCR, comprising: The determining unit is used to determine whether the target vehicle is in a state of wanting to stop when the working mode of the front-stage SCR in the dual SCR after-treatment system is the efficiency control mode. The state of wanting to stop is the state in which the target vehicle will stop within a preset time period, and the efficiency control mode is the mode in which the working efficiency of the front-stage SCR is the same as the set efficiency. The switching unit is used to switch the operating mode of the front-stage SCR from the efficiency control mode to the closed-loop control mode when the target vehicle is in the state of wanting to stop. The closed-loop control mode is a mode for closed-loop control of the ammonia storage inside the front-stage SCR. The replenishment unit is used to replenish the ammonia storage inside the pre-stage SCR when the pre-stage SCR is in the closed-loop control mode, and to use the replenished ammonia storage to convert NOx when the target vehicle is restarted after being stopped.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the control method for NOx conversion according to any one of claims 1 to 6.

9. An electronic device, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs including a control method for performing NOx conversion according to any one of claims 1 to 6.

Images