Control method for a dual bank scr system, dual bank scr system, vehicle and storage medium

Abstract

The application discloses a control method of a double-row SCR system, the double-row SCR system, a vehicle and a storage medium, and belongs to the technical field of automobiles. The control method comprises the following steps: when a cold starting phase of the double-row SCR system is executed, a first intake air temperature value of an intake air pipeline is acquired; when the first intake air temperature value is smaller than a preset intake air temperature value, a controller controls one catalytic branch to be opened and controls another catalytic branch to be closed; a first catalytic temperature value of the opened catalytic branch is acquired; when the first catalytic temperature value is greater than a preset catalytic temperature value and the first intake air temperature value is greater than the preset intake air temperature value, the current state of the opened catalytic branch is maintained, and the closed catalytic branch is controlled to be opened. When the cold starting phase is executed, if the detected intake air temperature value is low, only one catalytic branch is opened. The single-channel opening can quickly increase the SCR temperature of the opened catalytic branch, and then the urea spraying temperature can be quickly reached, so that the NOx emission under the cold starting is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a control method of a double-row SCR system, a double-row SCR system, a vehicle and a storage medium. BACKGROUND

[0002] China is a big country of automobiles, and with the rapid development of the automobile industry, the pollution of the environment is gradually serious, so the related technology of reducing automobile exhaust is also paid more and more attention.

[0003] Compared with the sixth SCR system, the double-row SCR system is internally provided with two independent flow channels, and each channel has the same catalyst. The double-row SCR system uses double-row arrangement to increase the flow area, but increases the volume of the catalyst carrier that needs to be heated, reduces the heating speed of the SCR in the cold start stage, increases the time for the SCR to reach the urea spray temperature, delays the reaction of the SCR with NOx in the cold start stage, and increases the NOx emission in the cold start low temperature stage.

[0004] Therefore, how to solve the technical problem of high NOx emission caused by the cold start of the double-row SCR system needs to be solved urgently. SUMMARY

[0005] To solve the technical problem of high NOx emission caused by the cold start of the double-row SCR system described in the background art, the present application provides a control method of a double-row SCR system, a double-row SCR system, a vehicle and a storage medium.

[0006] According to a first aspect, the embodiments of the present application provide a control method of a double-row SCR system, the double-row SCR system comprising an intake pipe and two catalytic branches with controllable opening degree connected with the intake pipe respectively, further comprising a controller electrically connected with the two catalytic branches, the control method comprising: acquiring a first intake temperature value of the intake pipe when the double-row SCR system executes a cold start stage; when the first intake temperature value is less than a preset intake temperature value, the controller controls one of the two catalytic branches to open and controls the other catalytic branch to close; acquiring a first catalytic temperature value of the opened catalytic branch; when the first catalytic temperature value is greater than a preset catalytic temperature value and the first intake temperature value is greater than the preset intake temperature value, maintaining the current state of the opened catalytic branch and controlling the closed catalytic branch to open.

[0007] Optionally, the two catalytic branches include a first catalytic branch and a second catalytic branch, when the first intake air temperature value is less than the preset intake air temperature value, the opened catalytic branch is the first catalytic branch, and the closed catalytic branch is the second catalytic branch, and when the first catalytic temperature value is greater than the preset catalytic temperature value and the first intake air temperature value is greater than the preset intake air temperature value, the current state of the opened catalytic branch is maintained, and the control of opening the closed catalytic branch includes: obtaining a first NOx conversion efficiency of the first catalytic branch; when the first NOx conversion efficiency is greater than a preset NOx conversion efficiency, the first intake air temperature value is greater than the preset intake air temperature value, and the first catalytic temperature value is greater than the preset catalytic temperature value, the second catalytic branch is controlled to be opened.

[0008] Optionally, the control of opening the second catalytic branch includes: obtaining a second catalytic temperature value of the second catalytic branch; when the second catalytic temperature value is less than the preset catalytic temperature value, the opening degree value of the second catalytic branch is controlled based on the second catalytic temperature value, and the second catalytic temperature value is positively correlated with the opening degree value.

[0009] Optionally, the control method of the double-row SCR system further includes: when the second catalytic temperature value is greater than the preset catalytic temperature value, the second catalytic branch is controlled to be fully opened.

[0010] Optionally, the control of opening one catalytic branch and closing the other catalytic branch when the first intake air temperature value is less than the preset intake air temperature value includes: when the first intake air temperature value is less than the preset intake air temperature value, the opened catalytic branch is controlled to be fully opened.

[0011] Optionally, the control method of the double-row SCR system further includes: controlling the two catalytic branches to be alternately opened and closed in different cold start stages.

[0012] According to a second aspect, the embodiments of the present application provide a double-row SCR system, including a controller, an intake air temperature sensor, a first temperature sensor, a second temperature sensor, an intake air pipeline, and two catalytic branches connected with the intake air pipeline and controllable in opening degree; wherein the intake air temperature sensor is arranged on the intake air pipeline and is used to detect a first intake air temperature value of the double-row SCR system; the first temperature sensor is arranged on one of the catalytic branches and is used to detect a first catalytic temperature value of the catalytic branch; the second temperature sensor is arranged on the other catalytic branch and is used to detect a second catalytic temperature value of the catalytic branch; the controller is electrically connected with the intake air temperature sensor, the first temperature sensor, the second temperature sensor, and the two catalytic branches, and is used to execute the control method of the double-row SCR system according to any one of the embodiments.

[0013] Optionally, the two-way catalytic branch includes a first catalytic branch and a second catalytic branch, the first catalytic branch includes a first control valve, and the second catalytic branch includes a second control valve; the first control valve is electrically connected to the controller, receives a first control signal sent by the controller, and changes the opening of the first catalytic branch based on the first control signal; the second control valve is electrically connected to the controller, receives a second control signal sent by the controller, and changes the opening of the second catalytic branch based on the second control signal.

[0014] Optionally, the system further includes an intake NOx sensor, a first NOx sensor, and a second NOx sensor; the intake NOx sensor is arranged on the intake pipeline and is configured to detect an intake NOx concentration; the first NOx sensor is arranged at an exhaust port of the first catalytic branch and is configured to detect a first NOx concentration at the exhaust port of the first catalytic branch; the second NOx sensor is arranged at an exhaust port of the second catalytic branch and is configured to detect a second NOx concentration at the exhaust port of the second catalytic branch; the controller is electrically connected to the intake NOx sensor, the first NOx sensor, and the second NOx sensor, respectively, receives the intake NOx concentration, the first NOx concentration, and the second NOx concentration, and determines the NOx conversion efficiency of the first catalytic branch and the second catalytic branch based on the intake NOx concentration, the first NOx concentration, and the second NOx concentration.

[0015] According to a third aspect, the embodiments of the present application provide a vehicle including the dual-SCR system according to the embodiments of the second aspect of the present application.

[0016] When the cold start phase is performed, if the detected first intake temperature value is low, only one of the two catalytic branches is opened. The opening of the single catalytic branch can quickly increase the SCR temperature of the opened catalytic branch by using the exhaust gas temperature, so as to quickly reach the urea spray temperature, realize the catalysis of NOx, and reduce the NOx emission under the cold start. When the opened catalytic branch completes the heating preparation for the other closed catalytic branch, if the first intake temperature value at this time decreases due to the vehicle working condition, opening the other closed catalytic branch at this time will cause the temperature rising speed of the originally closed catalytic branch to be slow, and will cause the NOx emission to increase again. Therefore, when the first catalytic temperature is greater than the preset catalytic temperature is detected, it is also necessary to determine whether the first intake temperature value at this time is greater than the preset temperature value. When it is determined that the first catalytic temperature is greater than the preset catalytic temperature, and the first intake temperature value is greater than the preset temperature value, the other closed catalytic branch is opened at this time. In this way, the back pressure of the dual-SCR system is reduced, and the increase of the NOx emission is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 This is a flowchart illustrating an optional control method for a dual-row SCR system according to an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of an optional dual-row SCR system according to an embodiment of this application;

[0020] Figure 3 This is a structural block diagram of an optional electronic device according to an embodiment of this application. Detailed Implementation

[0021] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate components with the same or similar structures but the same function.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0023] As described in the background section, compared to the China VI SCR system, the dual-row SCR system has two independent flow channels, each containing the same catalyst. While the dual-row arrangement increases the flow cross-sectional area to reduce back pressure, it also increases the volume of the catalyst support requiring heating, reducing the heating rate of the SCR during cold start. This results in a longer time for the SCR to reach the urea injection temperature, delaying the reaction between the SCR and NOx during cold start and increasing NOx emissions at low temperatures during the cold start phase.

[0024] Therefore, according to one aspect of the embodiments of this application, a control method for a dual-row SCR system is provided, see [link to relevant documentation]. Figures 1-2 As shown, the dual-row SCR system includes an intake manifold 30 and two catalytic converter branches with controllable openings, each connected to the intake manifold 30. It also includes a controller electrically connected to the two catalytic converter branches. The control method includes:

[0025] S10. During the cold start phase of the dual-row SCR system, the first intake temperature value of the intake pipe 30 is obtained.

[0026] S20. When the first intake temperature value is less than a preset intake temperature value, the controller controls one of the catalytic branches to open and controls the other catalytic branch to close.

[0027] S30. A first catalytic temperature value of the open catalytic branch is obtained.

[0028] S40. When the first catalytic temperature value is greater than a preset catalytic temperature value and the first intake temperature value is greater than the preset intake temperature value, the current state of the open catalytic branch is maintained and the closed catalytic branch is controlled to open.

[0029] In the embodiment, when the cold start phase is performed, if the detected first intake temperature value is low, only one of the catalytic branches is opened. The single branch can use the exhaust gas temperature to quickly increase the SCR temperature of the open catalytic branch, and then quickly reach the urea spray temperature, so as to realize the catalysis of NOx and reduce the NOx emission under the cold start. When the open catalytic branch completes the heating preparation for the other closed catalytic branch, if the first intake temperature value at this time is reduced due to the vehicle working condition, opening the other closed catalytic branch at this time will cause the temperature rising speed of the originally closed catalytic branch to be slow, and will cause the NOx emission to increase again. Therefore, when the first catalytic temperature is greater than the preset catalytic temperature, it is also necessary to judge whether the first intake temperature value at this time is greater than the preset temperature value. When it is judged that the first catalytic temperature is greater than the preset catalytic temperature and the first intake temperature value is greater than the preset temperature value, the other closed catalytic branch is controlled to open at this time, so as to realize the reduction of the back pressure of the double-row SCR system while avoiding the increase of the NOx emission.

[0030] As an exemplary embodiment, the two catalytic branches include a first catalytic branch 10 and a second catalytic branch 20. When the first intake temperature value is less than the preset intake temperature value, the open catalytic branch is the first catalytic branch 10 and the closed catalytic branch is the second catalytic branch 20. The maintaining of the current state of the open catalytic branch and the control of the closed catalytic branch to open when the first catalytic temperature value is greater than a preset catalytic temperature value and the first intake temperature value is greater than the preset intake temperature value includes: obtaining a first NOx conversion efficiency of the first catalytic branch 10; when the first NOx conversion efficiency is greater than a preset NOx conversion efficiency, the first intake temperature value is greater than the preset intake temperature value, and the first catalytic temperature value is greater than the preset catalytic temperature value, the second catalytic branch 20 is controlled to open.

[0031] In the embodiment, when the first intake temperature value is less than the preset intake temperature value, the opened catalytic branch is the first catalytic branch 10 and the closed catalytic branch is the second catalytic branch 20. When the SCR is heated in the cold start stage, in order to ensure the catalytic ability of the SCR and reduce the emission of NOx, the first NOx conversion efficiency of the first catalytic branch 10 can also be obtained. When the first NOx conversion efficiency is greater than the preset NOx conversion efficiency, it is indicated that the SCR of the first catalytic branch 10 can better convert NOx at this time, and the purpose of reducing the emission of NOx in the cold start stage is achieved. If it is also judged that the first intake temperature value is greater than the preset intake temperature value and the first catalytic temperature value is greater than the preset catalytic temperature value, it is indicated that the first catalytic branch 10 has completed heating. Therefore, the second catalytic branch 20 can be opened at this time, so as to heat the second catalytic branch 20 and reduce the back pressure of the double-row SCR system.

[0032] The first catalytic branch 10 and the second catalytic branch 20 can be catalytic branches composed of an oxidation catalyst (Diesel Oxident Catalyst, DOC), a diesel particulate filter (Diesel Particule Filter, DPF) and an SCR. The first catalytic branch 10 includes a first DOC 101, a first DPF 102 and a first SCR 103. The second catalytic branch 20 includes a second DOC 201, a second DPF 202 and a second SCR 203. After the exhaust gas reaches the inlet of the catalytic branch, it is discharged after passing through the DOC, the DPF and the SCR in sequence.

[0033] As an exemplary embodiment, the control of the opening of the second catalytic branch 20 includes: obtaining a second catalytic temperature value of the second catalytic branch 20; when the second catalytic temperature value is less than the preset catalytic temperature value, controlling the opening degree value of the second catalytic branch 20 based on the second catalytic temperature value, and the second catalytic temperature value is positively correlated with the opening degree value. Further comprising: when the second catalytic temperature value is greater than the preset catalytic temperature value, controlling the second catalytic branch 20 to be fully opened.

[0034] In the embodiment, when the second catalytic branch 20 is closed, the second SCR 203 of the second catalytic branch 20 has a low temperature, and if the second catalytic branch 20 is directly controlled to be fully opened at this time, the high-flow exhaust gas cannot be catalyzed well in the process of the temperature of the second SCR 203 of the second catalytic branch 20 rising to the urea spray temperature, which can cause high NOx emission. Therefore, when the second catalytic branch 20 is controlled to be opened, the second catalytic temperature value of the second catalytic branch 20 can be obtained in real time. When the second catalytic temperature value is less than the preset catalytic temperature value, it indicates that the catalytic ability of the second catalytic branch 20 to NOx is weak at this time. At this time, the opening degree of the second catalytic branch 20 can be adjusted based on the second catalytic temperature value. The greater the second catalytic temperature value, the greater the opening degree of the second catalytic branch 20. When the second catalytic temperature value is greater than the preset catalytic temperature value, the second catalytic branch 20 is controlled to be fully opened. The embodiment can realize heating of the second catalytic branch 20, and can gradually reduce the back pressure of the double-row SCR system as the opening degree of the second catalytic branch 20 gradually increases.

[0035] As an exemplary embodiment, the control of one of the catalytic branches to be opened and the other to be closed when the first intake air temperature value is less than the preset intake air temperature value includes: when the first intake air temperature value is less than the preset intake air temperature value, the opened catalytic branch is controlled to be fully opened.

[0036] In the embodiment, when the first intake air temperature value is less than the preset intake air temperature value, the opening degree of the catalytic branch that is controlled to be opened can be fully opened. Fully opening the catalytic branch can enable high-flow exhaust gas to pass through the SCR of the catalytic branch, which can quickly heat the SCR and quickly reach the urea spray temperature, thereby realizing rapid heating of the single catalytic branch and reducing NOx emission.

[0037] As an exemplary embodiment, the control method of the double-row SCR system further includes: controlling the two catalytic branches to be alternately opened and closed at different cold start stages.

[0038] In the embodiment, when the first intake air temperature value is less than the preset intake air temperature value at this cold start, the first catalytic branch 10 is controlled to be opened and the second catalytic branch 20 is controlled to be closed. When the first intake air temperature value is less than the preset intake air temperature value at the next cold start adjacent to this time, the second catalytic branch 20 is controlled to be opened and the first catalytic branch 10 is controlled to be closed. By alternately preferentially opening the first catalytic branch 10 and the second catalytic branch 20, the catalyst aging performance of the two catalytic branches can be similar, and the aging degree of the catalyst in a single catalytic branch can be prevented from being higher than that of the catalyst in the other catalytic branch, thereby reducing the service life of the overall double-row SCR system.

[0039] According to another aspect of the embodiments of the present application, a dual-row SCR system is provided, comprising a controller, an intake temperature sensor 40, a first temperature sensor 60, a second temperature sensor 70, an intake pipeline 30, and two catalytic branches with controllable opening degree connected to the intake pipeline 30 respectively; wherein the intake temperature sensor 40 is arranged on the intake pipeline 30 and used to detect a first intake temperature value of the dual-row SCR system; the first temperature sensor 60 is arranged on one of the catalytic branches and used to detect a first catalytic temperature value of the catalytic branch; the second temperature sensor 70 is arranged on the other catalytic branch and used to detect a second catalytic temperature value of the catalytic branch; and the controller is electrically connected to the intake temperature sensor 40, the first temperature sensor 60, the second temperature sensor 70, and the two catalytic branches respectively, and used to execute the control method of the dual-row SCR system according to any one of the embodiments described above.

[0040] In the present embodiment, when the cold start phase is executed, if the detected first intake temperature value is low, only one of the catalytic branches is opened. The opening of the single catalytic branch can quickly increase the SCR temperature of the opened catalytic branch by using the exhaust gas temperature, so as to quickly reach the urea spray temperature, realize the catalysis of NOx, and reduce the NOx emission under the cold start. When the opened catalytic branch completes the heating preparation for the other closed catalytic branch, if the first intake temperature value at this time is reduced due to the vehicle working condition, the opening of the other closed catalytic branch at this time will cause the slow temperature rise of the originally closed catalytic branch, and will cause the increase of NOx emission again. Therefore, when the first catalytic temperature is greater than the preset catalytic temperature is detected, it is also necessary to judge whether the first intake temperature value at this time is greater than the preset temperature value. When it is judged that the first catalytic temperature is greater than the preset catalytic temperature, and the first intake temperature value is greater than the preset temperature value, the other closed catalytic branch is opened at this time. In this way, the back pressure of the dual-row SCR system is reduced, and the increase of NOx emission is avoided.

[0041] As an exemplary embodiment, the two catalytic branches comprise a first catalytic branch 10 and a second catalytic branch 20, the first catalytic branch 10 comprises a first control valve 104, and the second catalytic branch 20 comprises a second control valve 204; wherein the first control valve 104 is electrically connected to the controller, used to receive the first control signal sent by the controller, and change the opening degree of the first catalytic branch 10 based on the first control signal; and the second control valve 204 is electrically connected to the controller, used to receive the second control signal sent by the controller, and change the opening degree of the second catalytic branch 20 based on the second control signal.

[0042] In the embodiment, the opening degree control of the two catalytic branches can be realized by the first control valve 104 and the second control valve 204, and the controller realizes the opening degree control of the first catalytic branch 10 and the second catalytic branch 20 by sending control signals to the first control valve 104 and the second control valve 204.

[0043] As an exemplary embodiment, the application further comprises an intake NOx sensor 50, a first NOx sensor 80 and a second NOx sensor 90; wherein the intake NOx sensor 50 is arranged on the intake pipeline 30 and used for detecting the intake NOx concentration; the first NOx sensor 80 is arranged at the exhaust port of the first catalytic branch 10 and used for detecting the first NOx concentration at the exhaust port of the first catalytic branch 10; the second NOx sensor 90 is arranged at the exhaust port of the second catalytic branch 20 and used for detecting the second NOx concentration at the exhaust port of the second catalytic branch 20; the controller is electrically connected with the intake NOx sensor 50, the first NOx sensor 80 and the second NOx sensor 90 respectively, used for receiving the intake NOx concentration, the first NOx concentration and the second NOx concentration, and determining the NOx conversion efficiency of the first catalytic branch 10 and the second catalytic branch 20 based on the intake NOx concentration, the first NOx concentration and the second NOx concentration.

[0044] In the embodiment, the way of obtaining the NOx conversion efficiency can be detecting in two catalytic branches, and the calculation formula of the NOx conversion efficiency is shown in formula (1):

[0045]

[0046] Wherein, η is the NOx conversion efficiency, c1 is the intake NOx concentration, and c2 is the NOx concentration at the exhaust port of the catalytic branch to be detected. In the embodiment, c2 can be the first NOx concentration or the second NOx concentration. The NOx conversion efficiency of the first catalytic branch 10 and the second catalytic branch 20 can be calculated by using formula (1), and then the calculated NOx conversion efficiency is compared with the preset NOx conversion efficiency to determine whether the catalytic branch is completed heating.

[0047] The application further provides a vehicle comprising the double-SCR system according to any of the above embodiments.

[0048] It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all described as a combination of a series of actions, but those skilled in the art should know that the present application is not limited to the action sequence described, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0049] Those skilled in the art can clearly understand from the description of the foregoing embodiments that the method according to the foregoing embodiments can be realized by means of software and a necessary general hardware platform, and of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product in essence or the part that contributes to the prior art, and the computer software product is stored in a storage medium (such as a ROM (Read-Only Memory), a RAM (Random Access Memory), a magnetic disk, or an optical disk), and includes a plurality of instructions for causing an end device (which can be a mobile phone, a computer, a server, or a network device) to execute the method described in each embodiment of the present application.

[0050] According to another aspect of the embodiments of the present application, an electronic device for implementing the control method of the double-row SCR system is also provided, which can be a server, a terminal, or a combination thereof.

[0051] Figure 3 is a structural block diagram of an optional electronic device according to the embodiments of the present application, as shown in Figure 3 includes a processor 302, a communication interface 304, a memory 306, and a communication bus 308, wherein the processor 302, the communication interface 304, and the memory 306 complete mutual communication through the communication bus 308, wherein,

[0052] The memory 306 is configured to store a computer program.

[0053] The processor 302 is configured to execute the computer program stored in the memory 306, and implement the following steps:

[0054] When the double-row SCR system is in a cold start phase, a first intake temperature value of the intake pipeline 30 is obtained;

[0055] When the first intake temperature value is less than a preset intake temperature value, the controller controls one of the two catalytic branches to be opened and the other catalytic branch to be closed.

[0056] acquiring a first catalytic temperature value of the opened catalytic branch;

[0057] when the first catalytic temperature value is greater than a preset catalytic temperature value and the first intake air temperature value is greater than a preset intake air temperature value, maintaining a current state of the opened catalytic branch and controlling the closed catalytic branch to open.

[0058] Optionally, in the embodiment, the communication bus can be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The communication bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, Figure 3 In the figure, only one thick line is used to represent the bus, but it does not mean that there is only one bus or only one type of bus.

[0059] The communication interface is used for communication between the electronic device and other devices.

[0060] The memory can include a RAM and can also include a non-volatile memory, for example, at least one disk memory. Optionally, the memory can also be at least one storage device located away from the aforementioned processor.

[0061] The processor can be a general-purpose processor, which can include but is not limited to a CPU (Central Processing Unit), an NP (Network Processor), and the like; and can also be a DSP (Digital Signal Processing), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0062] Optionally, specific examples in the embodiment can refer to the examples described in the above-described embodiments, and the embodiment will not be described here.

[0063] The above only describes the preferred embodiments of the present application. It should be noted that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

[0064] In addition, other configurations and effects of the vehicle according to the embodiment of the present application are known to those skilled in the art, and thus are not described here in order to reduce redundancy.

[0065] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In addition, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0066] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A control method of a dual-bank SCR system, characterized by, The double-row SCR system comprises an intake pipeline and two catalytic branches with controllable opening degree connected with the intake pipeline respectively, and further comprises a controller electrically connected with the two catalytic branches, and the control method comprises: When the double-row SCR system executes a cold start stage, a first intake temperature value of the intake pipeline is acquired; When the first intake temperature value is less than a preset intake temperature value, the controller controls one of the two catalytic branches to open and controls the other catalytic branch to close; A first catalytic temperature value of the opened catalytic branch is acquired; When the first catalytic temperature value is greater than a preset catalytic temperature value and the first intake temperature value is greater than the preset intake temperature value, the current state of the opened catalytic branch is maintained and the closed catalytic branch is controlled to open; The two catalytic branches comprise a first catalytic branch and a second catalytic branch, and when the first intake temperature value is less than the preset intake temperature value, the opened catalytic branch is the first catalytic branch and the closed catalytic branch is the second catalytic branch; A first NOx conversion efficiency of the first catalytic branch is acquired; When the first NOx conversion efficiency is greater than a preset NOx conversion efficiency, the first intake temperature value is greater than the preset intake temperature value, and the first catalytic temperature value is greater than the preset catalytic temperature value, the second catalytic branch is controlled to open.

2. The control method of a dual-bank SCR system according to claim 1, characterized by, The control of the second catalytic branch opening comprises: A second catalytic temperature value of the second catalytic branch is acquired; When the second catalytic temperature value is less than the preset catalytic temperature value, the opening degree value of the second catalytic branch is controlled based on the second catalytic temperature value, and the second catalytic temperature value is positively correlated with the opening degree value.

3. The control method of a dual-bank SCR system according to claim 2, characterized by, Further comprising: When the second catalytic temperature value is greater than the preset catalytic temperature value, the second catalytic branch is controlled to be fully opened.

4. The control method of a dual-bank SCR system according to claim 1, characterized by, The control of one of the two catalytic branches to open and the other catalytic branch to close when the first intake temperature value is less than the preset intake temperature value comprises: When the first intake temperature value is less than the preset intake temperature value, the opened catalytic branch is controlled to be fully opened.

5. The control method of a dual-bank SCR system according to claim 1, characterized by, Further comprising: The two catalytic branches are controlled to be alternately opened and closed in different cold start stages.

6. A dual bank SCR system characterized by, The controller, an intake temperature sensor, a first temperature sensor, a second temperature sensor, an intake pipeline, and two catalytic branches with controllable opening degree connected with the intake pipeline respectively are comprised; wherein, The intake temperature sensor is arranged on the intake pipeline and is used for detecting a first intake temperature value of the double-row SCR system; The first temperature sensor is arranged on one of the two catalytic branches and is used for detecting a first catalytic temperature value of the catalytic branch; The second temperature sensor is arranged on the other catalytic branch and is used for detecting a second catalytic temperature value of the catalytic branch; The controller is electrically connected with the intake temperature sensor, the first temperature sensor, the second temperature sensor, and the two catalytic branches respectively and is used for executing the control method of the double-row SCR system as claimed in any one of claims 1-5.

7. The dual bank SCR system of claim 6, wherein, The two-way catalytic branch includes a first catalytic branch and a second catalytic branch, the first catalytic branch includes a first control valve, and the second catalytic branch includes a second control valve; wherein The first control valve is electrically connected to the controller, receives a first control signal sent by the controller, and changes the opening of the first catalytic branch based on the first control signal; The second control valve is electrically connected to the controller, receives a second control signal sent by the controller, and changes the opening of the second catalytic branch based on the second control signal.

8. The dual bank SCR system of claim 7, wherein, Further comprising an intake NOx sensor, a first NOx sensor and a second NOx sensor; wherein The intake NOx sensor is arranged on the intake pipeline and is used to detect the intake NOx concentration; The first NOx sensor is arranged at the exhaust port of the first catalytic branch and is used to detect the first NOx concentration at the exhaust port of the first catalytic branch; The second NOx sensor is arranged at the exhaust port of the second catalytic branch and is used to detect the second NOx concentration at the exhaust port of the second catalytic branch; The controller is electrically connected to the intake NOx sensor, the first NOx sensor and the second NOx sensor respectively, receives the intake NOx concentration, the first NOx concentration and the second NOx concentration, and determines the NOx conversion efficiency of the first catalytic branch and the second catalytic branch based on the intake NOx concentration, the first NOx concentration and the second NOx concentration.

9. A vehicle characterized by comprising: The dual-SCR system comprises the two-way catalytic branch according to any one of claims 7-8.

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