CN116085095A

CN116085095A - Control method of double-row SCR system, vehicle and storage medium

Info

Publication number: CN116085095A
Application number: CN202310293875.4A
Authority: CN
Inventors: 贾德民; 吕志华; 王琛; 王晓艳; 石磊
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2023-03-21
Filing date: 2023-03-21
Publication date: 2023-05-09

Abstract

The invention 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, wherein the control method comprises the following steps: when the double-row SCR system executes a cold start stage, a first air inlet temperature value of an air inlet pipeline is obtained; when the first air inlet temperature value is smaller than a preset air inlet temperature value, the controller controls one of the catalytic branches to be opened and controls the other catalytic branch to be closed; acquiring a first catalytic temperature value of an opened catalytic branch; when the first catalytic temperature value is larger than the preset catalytic temperature value and the first air inlet temperature value is larger than the preset air inlet 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 start stage is executed, if the detected air inlet temperature value is lower, only one of the catalytic branches is opened, and the SCR temperature of the opened catalytic branch can be quickly increased by opening a single channel, so that the urea start-up temperature can be quickly reached, and the NOx emission under cold start is reduced.

Description

Control method of double-row SCR system, vehicle and storage medium

Technical Field

The invention relates to the technical field of automobiles, in particular to a control method of a double-row SCR system, the double-row SCR system, a vehicle and a storage medium.

Background

The China is a large automobile country, and along with the rapid progress and development of the automobile industry, the environmental pollution is also gradually serious, so that the related technology for reducing the tail rows of the automobiles is also more and more important.

Compared with the national six-SCR system, the double-row SCR system is internally provided with two independent flow channels, and each channel is internally provided with the same catalyst. The double-row SCR system adopts double-row arrangement to reduce back pressure, improves the flow cross section area, increases the volume of a catalyst carrier to be heated, reduces the temperature rising speed of SCR in a cold start stage, increases the time for the SCR to reach the urea start-up temperature, delays the reaction with NOx under the cold start of the SCR, and increases the NOx emission in a cold start low-temperature stage.

Therefore, how to solve the technical problem of high NOx emission caused by cold start of the double-row SCR system is needed to be solved.

Disclosure of Invention

In order to solve the technical problem of higher NOx emission caused by cold start of the double-row SCR system, which is described in the background art. The invention provides a control method of a double-row SCR system, the double-row SCR system, a vehicle and a storage medium.

According to a first aspect, an embodiment of the present application provides a control method of a double-row SCR system, where the double-row SCR system includes an air inlet pipeline, two catalytic branches with controllable opening degrees, which are connected with the air inlet pipeline, and a controller electrically connected with the two catalytic branches, and the control method includes: when the double-row SCR system executes a cold start stage, a first air inlet temperature value of the air inlet pipeline is obtained; when the first air inlet temperature value is smaller than a preset air inlet temperature value, the controller controls one of the catalytic branches to be opened and controls the other catalytic branch to be closed; acquiring a first catalytic temperature value of an opened catalytic branch; when the first catalytic temperature value is larger than a preset catalytic temperature value and the first air inlet temperature value is larger than the preset air inlet temperature value, the current state of the opened catalytic branch is maintained, and the closed catalytic branch is controlled to be opened.

Optionally, the two catalytic branches include a first catalytic branch and a second catalytic branch, when the first intake air temperature value is smaller than the preset intake air temperature value, the opened catalytic branch is the first catalytic branch, the closed catalytic branch is the second catalytic branch, when the first catalytic temperature value is larger than the preset catalytic temperature value, and the first intake air temperature value is larger than the preset intake air temperature value, the current state of the opened catalytic branch is maintained, and the controlling the closed catalytic branch to be opened includes: acquiring a first NOx conversion efficiency of the first catalytic bypass; and when the first NOx conversion efficiency is greater than a preset NOx conversion efficiency, the first air inlet temperature value is greater than the preset air inlet temperature value, and the first catalytic temperature value is greater than the preset catalytic temperature value, controlling the second catalytic branch to be opened.

Optionally, the controlling the second catalytic leg to open includes: obtaining a second catalytic temperature value of the second catalytic branch; and when the second catalytic temperature value is smaller than the preset catalytic temperature value, controlling the opening value of the second catalytic branch on the basis of the second catalytic temperature value, wherein the second catalytic temperature value is positively correlated with the opening value.

Optionally, the control method of the double-row SCR system further comprises: and when the second catalytic temperature value is larger than the preset catalytic temperature value, controlling the second catalytic branch to be fully opened.

Optionally, when the first intake air temperature value is smaller than a preset intake air temperature value, controlling one of the catalytic branches to be opened and the other catalytic branch to be closed includes: and when the first air inlet temperature value is smaller than the preset air inlet temperature value, controlling the opened catalytic branch to be fully opened.

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

According to a second aspect, an embodiment of the present application provides a dual-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 with controllable opening degrees respectively connected with the intake air pipeline; the air inlet temperature sensor is arranged on the air inlet pipeline and is used for detecting a first air inlet temperature value of the double-row SCR system; the first temperature sensor is arranged on one of the 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 path of catalytic branch and is used for detecting a second catalytic temperature value of the catalytic branch; the controller is electrically connected with the air inlet temperature sensor, the first temperature sensor, the second temperature sensor and the two paths of catalytic branches respectively, and is used for executing the control method of the double-row SCR system.

Optionally, the two catalytic branches comprise a first catalytic branch and a second catalytic branch, the first catalytic branch comprises a first control valve, and the second catalytic branch comprises a second control valve; the first control valve is electrically connected with the controller and is used for receiving a first control signal sent by the controller and changing the opening of the first catalytic branch based on the first control signal; the second control valve is electrically connected with the controller and is used for receiving a second control signal sent by the controller and changing the opening degree of the second catalytic branch based on the second control signal.

Optionally, the system further comprises an intake NOx sensor, a first NOx sensor and a second NOx sensor; the intake NOx sensor is arranged on the air inlet pipeline and is used for detecting the concentration of intake NOx; the first NOx sensor is arranged at an exhaust port of the first catalytic bypass and is used for detecting first NOx concentration at the exhaust port of the first catalytic bypass; the second NOx sensor is arranged at an exhaust port of the second catalytic bypass and is used for detecting a second NOx concentration at the exhaust port of the second catalytic bypass; the controller is electrically connected to the intake NOx sensor, the first NOx sensor, and the second NOx sensor, respectively, for receiving the intake NOx concentration, the first NOx concentration, and the second NOx concentration, and determining NOx conversion efficiencies of the first catalytic bypass and the second catalytic bypass based on the intake NOx concentration, the first NOx concentration, and the second NOx concentration.

According to a third aspect, embodiments of the present application provide a vehicle comprising a dual-row SCR system according to embodiments of the second aspect of the present application.

When the cold start stage is executed, if the detected first air inlet temperature value is lower, only one of the catalytic branches is opened, the single branch is opened, the SCR temperature of the opened catalytic branch can be quickly increased by utilizing the temperature of the exhaust gas, the urea start temperature is quickly reached, NOx catalysis is realized, NOx emission under the cold start is reduced, when the opened catalytic branch finishes heating to heat the other closed catalytic branch, if the temperature of the first air inlet temperature value at the moment is reduced due to the reasons of vehicle working conditions, the other closed catalytic branch is opened at the moment, the temperature rising speed of the original closed catalytic branch is slow, and the NOx emission is re-increased, so that when the first air inlet temperature is detected to be higher than the preset catalytic temperature, the first catalytic temperature is judged to be higher than the preset catalytic temperature at the moment, and when the first air inlet temperature is judged to be higher than the preset temperature value, the other closed catalytic branch is controlled to be opened at the moment, and the back pressure of the double-row SCR system is reduced, and the NOx emission is avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

FIG. 1 is a flow chart diagram of a control method of an alternative dual-bank SCR system according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of an alternative dual-bank SCR system according to an embodiment of the present application;

fig. 3 is a block diagram of an alternative electronic device according to an embodiment of the present application.

Detailed Description

For a clearer understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals refer to identical or structurally similar but functionally identical components throughout the separate views.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

As described in the background, compared to the six SCR system, the double-row SCR system has two independent flow channels inside, each with the same catalyst. The double-row SCR system adopts double-row arrangement to reduce back pressure, improves the flow cross section area, increases the volume of a catalyst carrier to be heated, reduces the temperature rising speed of SCR in a cold start stage, increases the time for the SCR to reach the urea start-up temperature, delays the reaction with NOx under the cold start of the SCR, and increases the NOx emission in a cold start low-temperature stage.

Thus, according to an aspect of the embodiments of the present application, there is provided a control method of a dual-row SCR system, referring to fig. 1 to 2, where the dual-row SCR system includes an intake pipe 30, two catalytic branches with controllable opening degrees respectively connected to the intake pipe 30, and a controller electrically connected to the two catalytic branches, and the control method includes:

s10, when the double-row SCR system executes a cold start stage, a first air inlet temperature value of the air inlet pipeline 30 is obtained.

S20, when the first air inlet temperature value is smaller than a preset air inlet temperature value, the controller controls one of the catalytic branches to be opened and controls the other catalytic branch to be closed.

S30, acquiring a first catalytic temperature value of the opened catalytic branch.

S40, when the first catalytic temperature value is larger than a preset catalytic temperature value and the first air inlet temperature value is larger than the preset air inlet temperature value, maintaining the current state of the opened catalytic branch and controlling the closed catalytic branch to be opened.

In this embodiment, when the cold start stage is executed, if the detected first intake air temperature value is lower, only one of the catalytic branches is opened, and the open single branch can use the exhaust gas temperature to quickly raise the SCR temperature of the opened catalytic branch, so as to quickly reach the urea start-up temperature, realize the catalysis of NOx, reduce NOx emission under cold start, when the opened catalytic branch completes heating to prepare for heating the other closed catalytic branch, if the first intake air temperature value at this time causes temperature reduction due to the vehicle working condition, the opening of the other closed catalytic branch at this time causes the temperature raising speed of the original closed catalytic branch to be slow, and the NOx emission rise is caused again, so when the first catalytic temperature is detected to be greater than the preset catalytic temperature, it is still necessary to determine whether the first intake air temperature value at this time is greater than the preset catalytic temperature value, and when the first intake air temperature value is greater than the preset temperature value at this time, the opening of the other closed catalytic branch is controlled, so as to avoid NOx emission rise while realizing reduction of back pressure of the double-row SCR system.

As an exemplary embodiment, the two catalytic branches include a first catalytic branch 10 and a second catalytic branch 20, when the first intake air temperature value is smaller than the preset intake air temperature value, the opened catalytic branch is the first catalytic branch 10, the closed catalytic branch is the second catalytic branch 20, 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, maintaining the current state of the opened catalytic branch, and controlling the closed catalytic branch to be opened includes: acquiring a first NOx conversion efficiency of the first catalytic bypass 10; and 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, controlling the second catalytic bypass 20 to open.

In this embodiment, when the first intake air temperature value is smaller than the preset intake air temperature value, the open catalytic bypass is taken as the first catalytic bypass 10, the closed catalytic bypass is taken as the second catalytic bypass 20, and when the SCR is heated in the cold start stage, in order to ensure the catalytic capability of the SCR and reduce the emission of NOx, the conversion efficiency of the first NOx of the first catalytic bypass 10 can also be obtained, when the first NOx conversion efficiency is determined to be greater than the preset NOx conversion efficiency, the SCR of the first catalytic bypass 10 can be used for better converting NOx, the purpose of reducing the emission of NOx in the cold start stage is achieved, and when the first catalytic temperature value is determined to be greater than the preset intake air temperature value, the first catalytic bypass 10 is determined to have completed heating, the second catalytic bypass 20 can be controlled to be opened, and the back pressure of the double-row SCR system can be controlled while the heating of the second catalytic bypass 20 is realized.

The first catalytic bypass 10 and the second catalytic bypass 20 may be catalytic bypass formed by an oxidation catalyst (Diesel Oxident Catalyst, DOC), a diesel particulate trap (Diesel Particule Filter, DPF) and SCR, the first catalytic bypass 10 includes a first DOC101, a first DPF102 and a first SCR103, the second catalytic bypass 20 includes a second DOC201, a second DPF202 and a second SCR203, and exhaust gas is discharged after passing through the DOC, the DPF and the SCR in sequence after reaching an inlet of the catalytic bypass.

As an exemplary embodiment, said controlling the opening of the second catalytic branch 20 comprises: acquiring a second catalytic temperature value of the second catalytic branch 20; and when the second catalytic temperature value is smaller than the preset catalytic temperature value, controlling the opening value of the second catalytic branch 20 based on the second catalytic temperature value, wherein the second catalytic temperature value is positively correlated with the opening value. Further comprises: and when the second catalytic temperature value is greater than the preset catalytic temperature value, controlling the second catalytic branch 20 to be fully opened.

In this embodiment, when the second catalytic bypass 20 is closed, the temperature of the second SCR203 of the second catalytic bypass 20 is lower, if the second catalytic bypass 20 is directly controlled to be fully opened at this time, in the process that the temperature of the second SCR203 of the second catalytic bypass 20 is raised to the urea start-up temperature, the high-flow exhaust gas cannot be catalyzed well, which results in higher NOx emission, so when the second catalytic bypass 20 is controlled to be opened, the second catalytic temperature value of the second catalytic bypass 20 can be obtained in real time, when the second catalytic temperature value is smaller than the preset catalytic temperature value, the second catalytic bypass 20 is characterized in that the catalytic capability of the second catalytic bypass 20 to NOx is weaker at this time, the opening of the second catalytic bypass 20 can be adjusted based on the second catalytic temperature value, and the opening of the second catalytic bypass 20 is larger until the second catalytic temperature value is larger than the preset catalytic temperature value.

As an exemplary embodiment, when the first intake air temperature value is smaller than a preset intake air temperature value, controlling one of the catalytic branches to be opened and the other catalytic branch to be closed includes: and when the first air inlet temperature value is smaller than the preset air inlet temperature value, controlling the opened catalytic branch to be fully opened.

In this embodiment, when the first intake air temperature value is smaller than the preset intake air temperature value, the opening degree of controlling one of the catalytic branches to be opened may be completely opened, and the opening degree of the catalytic branch is completely opened, so that the SCR of the exhaust gas with larger flow passing through the catalytic branch can be realized, the SCR can be quickly warmed up, the urea start-up temperature can be further quickly reached, the quick heating of the single catalytic branch is realized, and the NOx emission is reduced.

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

In this embodiment, when the first air inlet temperature value is detected to be smaller than the preset air inlet temperature value during the cold start, the first catalytic branch 10 is controlled to be opened, the second catalytic branch 20 is controlled to be closed, when the next adjacent cold start is detected to be smaller than the preset air inlet temperature value, the second catalytic branch 20 is controlled to be opened first, the first catalytic branch 10 is controlled to be closed, and the catalyst ageing performance of the two catalytic branches is similar through the mode that the first catalytic branch 10 and the second catalytic branch 20 are opened alternately and preferentially, so that the catalyst ageing degree in a single catalytic branch is prevented from being high, the service life is lower than that of the other catalytic branch, and the service life of the whole double-row SCR system is further reduced.

According to another aspect of an embodiment of the present application, there is provided a dual-row SCR system, including a controller, an intake air temperature sensor 40, a first temperature sensor 60, a second temperature sensor 70, an intake air pipe 30, and two catalytic branches with controllable opening degrees respectively connected to the intake air pipe 30; the intake air temperature sensor 40 is disposed in the intake air pipeline 30, and is configured to detect a first intake air temperature value of the dual-row SCR system; the first temperature sensor 60 is disposed on one of the catalytic branches, and is configured to detect a first catalytic temperature value of the catalytic branch; the second temperature sensor 70 is disposed on the other catalytic branch path, and is configured to detect a second catalytic temperature value of the catalytic branch path; the controller is electrically connected to the intake air temperature sensor 40, the first temperature sensor 60, the second temperature sensor 70, and the two catalytic branches, respectively, for executing the control method of the double-row SCR system according to any one of the above embodiments.

As an exemplary embodiment, the two catalytic branches include a first catalytic branch 10 and a second catalytic branch 20, the first catalytic branch 10 including a first control valve 104 and the second catalytic branch 20 including a second control valve 204; the first control valve 104 is electrically connected to the controller, and is configured to receive a first control signal sent by the controller, and change the opening of the first catalytic branch 10 based on the first control signal; the second control valve 204 is electrically connected to the controller, and is configured to receive a second control signal sent by the controller, and change the opening of the second catalytic branch 20 based on the second control signal.

In this embodiment, the controller may control the opening degrees of the two catalytic branches through the first control valve 104 and the second control valve 204, and the controller sends control signals to the first control valve 104 and the second control valve 204 to control the opening degrees of the first catalytic branch 10 and the second catalytic branch 20.

As an exemplary embodiment, further includes an intake NOx sensor 50, a first NOx sensor 80, and a second NOx sensor 90; wherein the intake NOx sensor 50 is disposed on the intake pipe 30, and is configured to detect an intake NOx concentration; the first NOx sensor 80 is disposed at an exhaust port of the first catalytic bypass 10, and is configured to detect a first NOx concentration at the exhaust port of the first catalytic bypass 10; the second NOx sensor 90 is disposed at an exhaust port of the second catalytic bypass 20, and is configured to detect a second NOx concentration at the exhaust port of the second catalytic bypass 20; the controller is electrically connected to the intake NOx sensor 50, the first NOx sensor 80 and the second NOx sensor 90, respectively, 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 bypass 10 and the second catalytic bypass 20 based on the intake NOx concentration, the first NOx concentration and the second NOx concentration.

In this embodiment, the NOx conversion efficiency may be obtained by detecting in two catalytic branches, and the calculation formula of the NOx conversion efficiency is shown in formula (1):

where η is NOx conversion efficiency, c1 is the intake NOx concentration, and c2 is the NOx concentration at the outlet of the catalytic bypass to be detected, in this embodiment, c2 may be the first NOx concentration or the second NOx concentration, and the calculation of the NOx conversion efficiencies of the first catalytic bypass 10 and the second catalytic bypass 20 may be performed by using the formula (1), so that by comparing the calculated NOx conversion efficiency with the preset NOx conversion efficiency, it is determined whether the catalytic bypass completes heating.

The application also provides a vehicle comprising the double-row SCR system according to any of the embodiments above.

It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required in the present application.

From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (such as ROM (Read-Only Memory)/RAM (Random Access Memory ), magnetic disk, optical disc), including instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method described in the embodiments of the present application.

According to still another aspect of the embodiments of the present application, there is also provided an electronic device for implementing the control method of the dual-row SCR system described above, where the electronic device may be a server, a terminal, or a combination thereof.

Fig. 3 is a block diagram of an alternative electronic device, according to an embodiment of the present application, including a processor 302, a communication interface 304, a memory 306, and a communication bus 308, as shown in fig. 3, wherein the processor 302, the communication interface 304, and the memory 306 communicate with each other via the communication bus 308, wherein,

a memory 306 for storing a computer program;

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

acquiring a first intake air temperature value of the intake air pipeline 30 when the double-row SCR system performs a cold start phase;

when the first air inlet temperature value is smaller than a preset air inlet temperature value, the controller controls one of the catalytic branches to be opened and controls the other catalytic branch to be closed;

acquiring a first catalytic temperature value of an opened catalytic branch;

when the first catalytic temperature value is larger than a preset catalytic temperature value and the first air inlet temperature value is larger than the preset air inlet temperature value, the current state of the opened catalytic branch is maintained, and the closed catalytic branch is controlled to be opened.

Alternatively, in the present embodiment, the above-described communication bus may be a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus, or an EISA (Extended Industry Standard Architecture ) bus, or the like. The communication bus may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, only one thick line is shown in fig. 3, but not only one bus or one type of bus.

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

The memory may include RAM or may include non-volatile memory (non-volatile memory), such as at least one disk memory. Optionally, the memory may also be at least one memory device located remotely from the aforementioned processor.

The processor may be a general purpose processor and may include, but is not limited to: CPU (Central Processing Unit ), NP (Network Processor, network processor), etc.; but also DSP (Digital Signal Processing, digital signal processor), ASIC (Application Specific Integrated Circuit ), FPGA (Field-Programmable Gate Array, field programmable gate array) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components.

Alternatively, specific examples in this embodiment may refer to examples described in the foregoing embodiments, and this embodiment is not described herein.

The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application and are intended to be comprehended within the scope of the present application.

In addition, other structures and functions of the vehicle according to the embodiment of the present invention are known to those skilled in the art, and are not described herein for the sake of redundancy.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular 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 invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. The control method of the double-row SCR system is characterized by comprising an air inlet pipeline, two paths of catalytic branches with controllable opening degrees, which are respectively connected with the air inlet pipeline, and a controller electrically connected with the two paths of catalytic branches, wherein the control method comprises the following steps:

when the double-row SCR system executes a cold start stage, a first air inlet temperature value of the air inlet pipeline is obtained;

acquiring a first catalytic temperature value of an opened catalytic branch;

2. The control method of a double-row SCR system of claim 1, wherein the two catalytic branches comprise a first catalytic branch and a second catalytic branch, wherein the open catalytic branch is the first catalytic branch and the closed catalytic branch is the second catalytic branch when the first intake temperature value is less than the preset intake temperature value, wherein the maintaining the current state of the open catalytic branch and controlling the closed catalytic branch to open when the first catalytic temperature value is greater than the preset catalytic temperature value and the first intake temperature value is greater than the preset intake temperature value comprises:

acquiring a first NOx conversion efficiency of the first catalytic bypass;

and when the first NOx conversion efficiency is greater than a preset NOx conversion efficiency, the first air inlet temperature value is greater than the preset air inlet temperature value, and the first catalytic temperature value is greater than the preset catalytic temperature value, controlling the second catalytic branch to be opened.

3. The control method of a double-row SCR system of claim 2, wherein said controlling the second catalytic leg to open comprises:

obtaining a second catalytic temperature value of the second catalytic branch;

and when the second catalytic temperature value is smaller than the preset catalytic temperature value, controlling the opening value of the second catalytic branch on the basis of the second catalytic temperature value, wherein the second catalytic temperature value is positively correlated with the opening value.

4. The control method of a double-row SCR system of claim 3, further comprising:

and when the second catalytic temperature value is larger than the preset catalytic temperature value, controlling the second catalytic branch to be fully opened.

5. The control method of the double-row SCR system according to claim 1, wherein when the first intake air temperature value is smaller than a preset intake air temperature value, controlling one of the catalytic branches to be opened and the other catalytic branch to be closed comprises:

and when the first air inlet temperature value is smaller than the preset air inlet temperature value, controlling the opened catalytic branch to be fully opened.

6. The control method of a double-row SCR system of claim 1, further comprising:

and controlling the two catalytic branches to be alternately opened and closed in different cold start stages.

7. The double-row SCR system is characterized by comprising a controller, an air inlet temperature sensor, a first temperature sensor, a second temperature sensor, an air inlet pipeline and two catalytic branches with controllable opening degrees, wherein the two catalytic branches are respectively connected with the air inlet pipeline; wherein, the liquid crystal display device comprises a liquid crystal display device,

the air inlet temperature sensor is arranged on the air inlet pipeline and is used for detecting a first air inlet temperature value of the double-row SCR system;

the first temperature sensor is arranged on one of the 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 path of catalytic branch and is used for detecting a second catalytic temperature value of the catalytic branch;

the controller is electrically connected to the intake air temperature sensor, the first temperature sensor, the second temperature sensor, and the two catalytic branches, respectively, for executing the control method of the double-row SCR system according to any one of claims 1-6.

8. The dual-row SCR system of claim 7, wherein the two catalytic legs comprise a first catalytic leg comprising a first control valve and a second catalytic leg comprising a second control valve; wherein, the liquid crystal display device comprises a liquid crystal display device,

the first control valve is electrically connected with the controller and is used for receiving a first control signal sent by the controller and changing the opening of the first catalytic branch based on the first control signal;

the second control valve is electrically connected with the controller and is used for receiving a second control signal sent by the controller and changing the opening degree of the second catalytic branch based on the second control signal.

9. The dual-bank SCR system of claim 8, further comprising an intake NOx sensor, a first NOx sensor, and a second NOx sensor; wherein, the liquid crystal display device comprises a liquid crystal display device,

the intake NOx sensor is arranged on the air inlet pipeline and is used for detecting the concentration of intake NOx;

the first NOx sensor is arranged at an exhaust port of the first catalytic bypass and is used for detecting first NOx concentration at the exhaust port of the first catalytic bypass;

the second NOx sensor is arranged at an exhaust port of the second catalytic bypass and is used for detecting a second NOx concentration at the exhaust port of the second catalytic bypass;

the controller is electrically connected to the intake NOx sensor, the first NOx sensor, and the second NOx sensor, respectively, for receiving the intake NOx concentration, the first NOx concentration, and the second NOx concentration, and determining NOx conversion efficiencies of the first catalytic bypass and the second catalytic bypass based on the intake NOx concentration, the first NOx concentration, and the second NOx concentration.

10. A vehicle comprising a double-row SCR system according to any one of claims 7-9.