CN115030800A

CN115030800A - SCR system control method and device and vehicle

Info

Publication number: CN115030800A
Application number: CN202111390910.1A
Authority: CN
Inventors: 刘世龙
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-09-09
Anticipated expiration: 2041-11-19
Also published as: CN115030800B

Abstract

The embodiment of the application relates to the technical field of automobiles, in particular to a control method and a control device of an SCR system and a vehicle, wherein the control method comprises the following steps: acquiring environmental information of a current environment; determining a correction coefficient for the NH3 storage amount in the SCR system according to the environment information; acquiring the basic storage amount of NH3 corresponding to the current working condition in the SCR system; determining an NH3 target storage amount according to the correction coefficient and an NH3 basic storage amount; according to the NH3 target storage amount, the corresponding urea injection amount of the SCR system when the SCR system stores NH3 of the NH3 target storage amount is determined, and the SCR system is controlled to inject urea according to the urea injection amount so as to generate and store NH3 of the NH3 target storage amount. The adjustment amount of the generated amount of NH3 when the environment is adapted to the current environment is determined according to the environment information, and the basic NH3 storage amount under the standard environment under the current working condition, the target NH3 storage amount which can react to NOx under the current environment and can not overflow is determined, NH3 of the target NH3 storage amount is generated and stored, and the storage amount of NH3 is adapted to the generated amount of NOx.

Description

SCR system control method and device and vehicle

Technical Field

The embodiment of the application relates to the technical field of automobiles, in particular to a control method and device of an SCR system and a vehicle.

Background

The diesel exhaust pollutants, mainly NOx and PM, must be combined with exhaust gas after-treatment technology to control the emission of NOx and PM according to advanced development experience of developed countries in the automobile industry, and NOx emission is reduced by removing NOx through Selective Catalytic Reduction (SCR) technology by using an SCR system to generate NH 3.

In the related art, the SCR system generates and stores a certain amount of NH3 during operation to react with Nox, however, Nox emitted from the engine correspondingly changes due to the change of oxygen content in the environment under different working environments, so that the storage amount of NH3 is not adapted to the generation amount of Nox, and the emission of tail gas is not satisfactory.

Disclosure of Invention

The embodiment of the application provides a control method and device of an SCR system and a vehicle, and aims to solve the problem that the storage amount of NH3 is not adaptive to the generated amount of NOx.

In a first aspect, an embodiment of the present invention provides a control method for an SCR system, where the control method includes:

acquiring environmental information of a current environment;

determining a correction coefficient for the NH3 storage amount in the SCR system according to the environment information;

determining a basic NH3 storage amount corresponding to the current working condition in the SCR system;

determining the NH3 target storage amount according to the correction coefficient and the NH3 basic storage amount;

according to the NH3 target storage amount, determining the corresponding urea injection amount when the SCR system stores NH3 of the NH3 target storage amount;

and controlling the SCR system to spray urea according to the urea spraying amount.

Optionally, the environmental information at least includes an ambient temperature and an atmospheric pressure, and the determining a correction factor for an amount of NH3 stored in the SCR system according to the environmental information includes:

determining the correction coefficient corresponding to the combination of the environmental temperature and the atmospheric pressure based on an environmental correction chart; wherein the environmental correction map includes correction factors for the SCR system when the NH3 is stored at different combinations of ambient temperature and different barometric pressure.

Optionally, the method further comprises:

selecting different environment information, and defining preset selection intervals in respective preset test ranges to determine a plurality of different first test points;

determining a first demand for NH3 for catalytic reduction of exhaust of the engine by the SCR system based on the first plurality of test points;

determining correction coefficients corresponding to the first test points according to the first NH3 demand and a preset NH3 demand; wherein the preset NH3 demand is a NH3 demand for catalytic reduction of exhaust gases of the engine by the SCR system under preset conditions;

and constructing the environment correction chart according to the plurality of first test points and the correction coefficients corresponding to the first test points.

Optionally, the current operating condition includes a current exhaust temperature and an aging coefficient of the SCR system, and determining a basic storage amount of NH3 corresponding to the current operating condition in the SCR system includes:

acquiring a basic storage chart of the SCR system; wherein the basic memory map includes basic amounts of NH3 for combinations of different exhaust temperatures and different aging coefficients;

and determining the basic NH3 storage amount corresponding to the current working condition based on the basic storage chart.

Optionally, the method further comprises:

under the condition of a standard environment, selecting different exhaust temperature and different aging coefficient combinations of the SCR system, dividing preset selection intervals in respective preset test ranges, and determining a plurality of different second test points;

determining a second demand for NH3 for catalytic reduction of exhaust of the engine by the plurality of SCR systems based on the second plurality of test points;

and determining the basic storage chart according to the plurality of second test points and the plurality of second NH3 demand quantities.

A second aspect of an embodiment of the present application provides a control device for an SCR system, the control device including:

the first acquisition module is used for acquiring the environmental information of the current environment;

the first determining module is used for determining a correction coefficient of NH3 storage amount in the SCR system according to the environment information;

the second acquisition module is used for acquiring basic NH3 storage amount corresponding to the current working condition in the SCR system;

a second determining module, configured to determine the NH3 target storage amount according to the correction coefficient and the NH3 base storage amount;

the execution module is used for determining the corresponding urea injection amount of the SCR system when NH3 of the NH3 target storage amount is stored according to the NH3 target storage amount; and controlling the SCR system to spray urea according to the urea spraying amount.

Optionally, the control device further comprises:

and the first chart determining module is used for determining the environment correction chart.

Optionally, the control device further comprises:

and the second chart determining module is used for determining the basic storage chart.

A third aspect of embodiments of the present application provides an electronic device, where the electronic device includes:

a memory for storing a computer program;

a processor for executing a computer program stored on the memory to implement the above-described method.

A fourth aspect of the embodiments of the present application provides a vehicle, characterized by including a control device to implement the control method described above.

By adopting the control method, the control device and the vehicle of the SCR system, when the vehicle works in different areas, such as when the vehicle is in a plateau area, the atmospheric pressure is different, so that the oxygen content in air and the air temperature are different, and the Nox generated when the engine works is different from a standard environment, so that the Nox is easily reacted in a low NH3 generation amount under the standard condition of the SCR system, or the Nox is remained after the Nox is reacted in a high NH3 generation amount, so that the emission amount of the Nox or NH3 is ultrahigh when the tail gas is discharged, therefore, the adjustment amount of the NH3 generation amount, namely the correction coefficient of the NH3 storage amount when the current environment is adapted to the current environment is determined according to the environmental information by acquiring the environmental information of the current environment of the vehicle, then the NH3 basic storage amount under the standard environment of the current working condition of the vehicle is acquired, and the NH3 target storage amount, which can react the Nox and can not overflow under the current environment of the vehicle, is determined according to the NH3 basic storage amount and the correction coefficient, and determining a urea injection amount corresponding to the target storage amount of stored NH3, and controlling the SCR system to inject urea according to the urea injection amount to generate and store NH3 of the NH3 target storage amount, so that the storage amount of NH3 is adapted to the generation amount of NOx.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic flowchart of a control method according to an embodiment of the present application;

FIG. 2 is a schematic flow chart illustrating a process for determining an environmental correction chart according to an embodiment of the present application;

FIG. 3 is a flowchart illustrating a process for determining a basic amount of NH3 stored according to an embodiment of the present application;

FIG. 4 is a schematic flow chart of determining a basic memory map according to an embodiment of the present application;

FIG. 5 is a block diagram of a control device according to an embodiment of the present application;

fig. 6 is a schematic diagram of an electronic device according to an embodiment of the present application;

FIG. 7 is a chart of environmental corrections proposed in an embodiment of the present application;

FIG. 8 is a basic memory map presented in accordance with an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The main chemical reaction in the SCR is to remove NOx by NH3, and urea injected from a urea nozzle is atomized at a high exhaust temperature to generate NH3, which is then adsorbed by the SCR carrier. NOx is reduced by NH3 to N2, relying on a precious metal coated on an SCR support as a catalyst.

In the related art, in order to balance the "reactivity to NOx" and the "NH 3 slip caused by the increase of the temperature of the SCR carrier", a reasonable NH3 storage value needs to be set for the NH3 stored in the SCR carrier, however, the NH3 storage value is often determined in a standard environment, NOx emitted by an engine also changes due to the change of oxygen content in the environment in other environments such as a plateau condition, the NH3 storage value set in the standard environment is not applicable, the "reactivity to NOx" is not sufficient or the "NH 3 slip caused by the increase of the temperature of the SCR carrier" is too large, the storage amount of NH3 is not adapted to the generated amount of NOx, and the emission of exhaust gas is not satisfactory.

Example one

In view of the above, a first aspect of the embodiments of the present application provides a control method for an SCR system, where the SCR system mainly includes a catalyst, a urea supply and injection system, and a control system. The catalyst is coated on the carrier inside the catalyst, so that the reduction reaction rate of NOx can be accelerated. The urea supply system provides high-pressure injection power for the urea nozzle, so that urea liquid drops are fully atomized, and the NOx conversion efficiency is improved. The control system accurately controls the urea injection quantity in real time according to the working condition of the engine, detects the running condition of the SCR system, and can take corresponding treatment measures when the system breaks down.

Referring to fig. 1, the control method includes:

and S1, acquiring the environmental information of the current environment.

When the vehicle works in different areas, such as a plateau area, the atmospheric pressure is different, so that the oxygen content in the air and the air temperature are different, and the Nox generated when the engine works is different from the standard environment, so that the environmental information of the current environment of the vehicle is obtained and is used as a basis for determining and adjusting the generation amount of the NH 3.

And S2, determining a correction coefficient for the NH3 storage amount in the SCR system according to the environment information.

In some cases, Nox cannot be easily reacted when the generation amount of NH3 of the SCR system is low under a standard condition, or Nox cannot be easily reacted when the generation amount of NH3 is high, or Nox cannot be completely adsorbed, so that the emission amount of Nox or NH3 is ultrahigh when the exhaust gas is discharged, therefore, the correction coefficient for the NH3 storage amount is determined according to the acquired environmental information, and when Nox cannot be easily reacted when the generation amount of NH3 is low, the correction coefficient is greater than 1, and the generation amount of NH3 is increased. When the amount of NH3 produced is high, the correction coefficient is less than 1, and the amount of NH3 produced is reduced.

And S3, obtaining the basic NH3 storage amount corresponding to the current working condition in the SCR system.

Under a standard environment, for example, in a plain area, when the ambient temperature is at a standard temperature, the basic NH3 storage effect of the SCR system under different working conditions is different, so that the basic NH3 storage amount of the SCR system under a specific standard condition is obtained as the basis of the actual NH3 storage amount.

S4, determining the NH3 target storage amount according to the correction coefficient and the NH3 basic storage amount.

Multiplying the correction coefficient by the NH3 basic storage amount is the corrected NH3 target storage amount under the current environment, so that the Nox generated under the current environment can be reflected, and excessive leakage of NH3 can be avoided.

And S5, according to the NH3 target storage amount, determining the corresponding urea injection amount when NH3 of the SCR system is used for storing the NH3 target storage amount.

And S6, controlling the SCR system to spray urea according to the urea spraying amount.

Urea aqueous solution is sprayed into an engine exhaust pipe, and is atomized at a high exhaust temperature to generate NH3, and then the NH3 is adsorbed by an SCR carrier, and NOx is reduced by NH3 to generate N2 through the catalysis of noble metal on the SCR carrier, so that the aim of removing NOx is fulfilled.

The method comprises the steps of obtaining environment information of the current environment of a vehicle, determining an adjustment amount of NH3 generation amount when the current environment is adapted according to the environment information, namely a correction coefficient of NH3 storage amount, obtaining NH3 basic storage amount under a standard environment of the current working condition of the vehicle, determining NH3 target storage amount which can react NOx and can not overflow under the current environment of the vehicle according to the NH3 basic storage amount and the correction coefficient, determining a urea ejection amount corresponding to the target storage amount of stored NH3, and controlling an SCR system to eject urea according to the urea ejection amount to generate and store NH3 of the NH3 target storage amount, so that the storage amount of NH3 is adapted to the generation amount of NOx.

In some embodiments, the environmental information includes at least an ambient temperature and an atmospheric pressure, and determining a correction factor for an amount of NH3 stored in the SCR system based on the environmental information includes:

and substituting the environmental temperature and the atmospheric pressure into an environmental correction chart to determine a correction coefficient corresponding to the current environment. Wherein the environmental correction map includes correction factors for the SCR system when NH3 is stored at different combinations of ambient temperature and different barometric pressure.

The atmospheric pressure and the ambient temperature of the environment where the engine is located are obtained in real time through a sensor on an engine controller ECU, and are substituted into an environment correction chart of a correction coefficient of the SCR system when NH3 is stored under the combination of different ambient temperatures and different atmospheric pressures, so that the correction coefficient of NH3 storage amount in the SCR system is obtained.

In some embodiments, the engine operating ambient temperature ranges from-40 ℃ to 50 ℃ and the atmospheric pressure ranges from: 100kpa ~ 50kpa, acquire the environmental coefficient through the sensor on the engine controller ECU, through to ambient temperature and atmospheric pressure accurate discernment, improve SCR system performance under plateau environment for example to need not to add extra hardware on the engine, improved the suitability of this application, reduced vehicle cost.

In some embodiments, referring to fig. 2 and 7, the method further comprises:

s101, selecting different environment information, defining preset selection intervals in respective preset test ranges, and determining a plurality of different first test points.

When determining the environment correction chart, experiments are often required in advance to simulate the correction coefficient when the SCR system can achieve a predetermined effect under different environments.

In some embodiments, the range of the working environment temperature of the engine is-40 ℃ to 50 ℃, the range of the atmospheric pressure is 100kpa to 50kpa, the range is used as a preset test range, the preset range is divided into different test sections, and the different test sections are combined in pairs to obtain a plurality of first test points.

S102, determining a first demand of NH3 for catalytic reduction of exhaust gas of the engine by the SCR system according to a plurality of first test points.

And taking the environmental information of each first test point as a test environment to perform experiments, and determining the storage amount of NH3 which can ensure that Nox can react and can not overflow under each first test point as a first demand of NH 3.

S103, determining correction coefficients corresponding to the first test points according to the first NH3 demand and a preset NH3 demand; wherein the preset demand of NH3 is a demand of NH3 for catalytic reduction of exhaust gas of the engine by the SCR system under preset conditions.

Selecting NH3 storage capacity in a standard environment as preset demand of NH3, wherein the preset demand can be NH3 storage capacity of an engine which is guaranteed to react with NOx and cannot overflow at a standard working temperature and under a standard atmospheric pressure, determining a ratio of the first demand to the preset demand, and taking the ratio as a correction coefficient corresponding to the first test point. In some specific embodiments, the range of the correction coefficient can be generally determined to be 0.6-1.5, and correction coefficients can be determined for different engines or different vehicles according to actual conditions, so that the actual conditions of the vehicles can be better fitted in the adjustment process to match with different engines or vehicles, and the applicability of the application is improved.

And S104, constructing an environment correction chart according to the plurality of first test points and the correction coefficients corresponding to the plurality of first test points.

And summarizing the environmental information and the correction coefficients of the tested first test points to obtain an environmental correction chart, and directly obtaining the corresponding correction coefficients of the environmental information in the environmental correction chart when the vehicle is in certain environmental information.

In some embodiments, the current operating conditions include a current exhaust temperature and an aging factor of the SCR system, and determining a base amount of NH3 stored corresponding to the current operating conditions in the SCR system includes:

in which the upper limit amount of NH3 storage of the SCR system may change at different temperatures, which may easily result in NH3 overflow when the SCR system is warmed up. Meanwhile, the SCR system is easy to age along with the increase of the service time, so that the NH3 storage upper limit amount of the SCR system can be changed, and therefore when the NH3 basic storage amount is determined, the exhaust temperature and the aging coefficient of the SCR system are used as standards, and the NH3 storage upper limit amount of the SCR system is accurately obtained.

In some embodiments, referring to FIG. 3, determining a base amount of NH3 stored corresponding to current operating conditions in the SCR system includes:

s201, acquiring a basic storage chart of the SCR system; wherein the basic storage table includes basic storage amounts of NH3 corresponding to combinations of different exhaust temperatures and different aging coefficients.

S202, determining the basic NH3 storage amount corresponding to the current working condition based on the basic storage chart.

By taking the exhaust temperature and the aging coefficient of the SCR system as standards, the NH3 storage upper limit quantity of the SCR system is accurately obtained, the catalytic performance of the SCR system is utilized to the maximum extent, meanwhile, the NH3 is prevented from overflowing when the temperature of the SCR system rises, and the practicability and practicability of the whole method are effectively improved. Different engines or different vehicles can determine different basic storage charts according to actual conditions, so that the actual conditions of the vehicles are more fitted in the adjusting process, different engines or vehicles are matched, and the applicability of the engine is improved.

In some embodiments, referring to fig. 4 and 8, the method further comprises:

s301, under the condition of a standard environment, selecting different exhaust temperature and different aging coefficient combinations of the SCR system, dividing preset selection intervals in respective preset test ranges, and determining a plurality of different second test points.

In some embodiments, the range of the engine exhaust temperature is 25 ℃ to 625 ℃, the range of the SCR aging coefficient is 90% to 30%, the range is used as a preset test range, the preset range is divided into different test sections, and the different test sections are combined in pairs, so as to obtain a plurality of second test points.

S302, determining a second demand for NH3 for catalytic reduction of exhaust of the engine by the plurality of SCR systems according to the second plurality of test points.

And (3) performing experiments on the combination of the exhaust temperature and the aging coefficient of each second test point, and determining the amount of stored NH3 which can ensure that NOx can react and can not overflow under each second test point as a second demand of NH 3.

And S303, determining a basic storage chart according to the plurality of second test points and the plurality of second NH3 demand quantities.

And summarizing the exhaust temperature and the aging coefficient of each tested second test point and the second NH3 demand to obtain a basic storage chart, and when the vehicle is at a certain exhaust temperature and aging coefficient, directly obtaining the corresponding second NH3 demand in the basic storage chart and determining the second NH3 demand as the basic NH3 storage amount.

Example two

Based on the same inventive concept, another embodiment of the present application provides a control device of an SCR system, and referring to fig. 5, the control device 4 includes:

a first obtaining module 41, configured to obtain environment information of a current environment.

The first obtaining module 41 may be a sensor on the engine controller ECU, so as to obtain environmental information of an environment where the engine is located in real time.

The first determination module 42 is configured to determine a correction factor for an amount of NH3 stored in the SCR system based on the environmental information.

A second acquisition module 43 determines a base amount of NH3 stored corresponding to a current operating condition of the SCR system.

A second determining module 44, configured to determine the NH3 target storage amount according to the correction coefficient and the NH3 base storage amount;

and the execution module 45 is used for determining a corresponding urea injection amount of the SCR system when NH3 is stored in the target NH3 storage amount according to the target NH3 storage amount, and controlling the SCR system to inject urea according to the urea injection amount so as to generate and store NH3 of the target NH3 storage amount.

In some embodiments, the first obtaining module 41 is further configured to perform the following steps:

the ambient temperature and the atmospheric pressure of the environment in which the vehicle engine is located are obtained.

In some embodiments, the determination module 42 is further configured to perform the following steps:

In some embodiments, the control apparatus further includes a first chart determination module 46 for determining an environmental correction chart.

In some embodiments, the first chart determination module 46 is further configured to perform the steps of:

selecting different environment information, and defining preset selection intervals in respective preset test ranges to determine a plurality of different first test points.

A first demand for NH3 for catalytic reduction of exhaust of the engine by the SCR system is determined based on the first plurality of test points.

And acquiring a preset demand of NH3, and determining a plurality of correction coefficients corresponding to the plurality of first test points according to the first demand and the preset demand. Wherein the preset demand is a demand for NH3 for catalytic reduction of exhaust of the engine by the SCR system under preset conditions.

And determining an environment correction chart according to the plurality of first test points and the plurality of correction coefficients.

In some embodiments, the control apparatus further includes a second chart determination module 47 for determining a base stored chart.

In some embodiments, the second chart determination module 47 is further configured to perform the steps of:

and determining a basic storage chart according to the plurality of second test points and the plurality of second NH3 demand quantities.

In some embodiments, the second obtaining module 43 is further configured to perform the following steps:

and acquiring the exhaust temperature and the aging coefficient of the SCR system.

Based on the exhaust temperature and the aging factor, a base amount of NH3 is determined.

and acquiring a basic storage chart of the SCR system. Wherein the basic storage map includes basic storage amounts of NH3 corresponding to combinations of non-exhaust temperatures and different aging coefficients.

And substituting the exhaust temperature and the aging coefficient of the SCR system into the basic storage chart to determine the basic storage amount of NH3 corresponding to the current working condition.

Based on the same inventive concept, referring to fig. 6, another embodiment of the present application provides an electronic device, including:

a memory for storing a computer program.

A processor for executing the computer program stored on the memory to implement the method of embodiment one.

Based on the same inventive concept, another embodiment of the present application provides a vehicle, which includes the control device provided in the second embodiment, so as to implement the control method of the first embodiment.

For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

As will be appreciated by one of skill in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.

The foregoing detailed description is provided for a control method, a control device and a vehicle of an SCR system provided in the present application, and specific examples are applied herein to explain the principles and embodiments of the present application, and the description of the foregoing embodiments is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A control method of an SCR system, characterized by comprising:

acquiring environmental information of a current environment;

according to the target NH3 storage amount, determining the corresponding urea injection amount when the SCR system stores NH3 of the target NH3 storage amount;

2. The control method according to claim 1, wherein the environmental information includes at least an ambient temperature and an atmospheric pressure;

determining a correction coefficient for the storage amount of NH3 in the SCR system according to the environment information, wherein the correction coefficient comprises the following steps:

acquiring an environment correction chart, and determining the correction coefficient corresponding to the combination of the environment temperature and the atmospheric pressure based on the environment correction chart; wherein the environmental correction map includes correction factors for the SCR system when the NH3 is stored at different combinations of ambient temperature and different barometric pressure.

3. The control method of claim 2, wherein obtaining an environmental correction chart comprises:

selecting different environment information, defining preset selection intervals in respective preset test ranges, and determining a plurality of different first test points;

4. The control method of claim 1, wherein the current operating conditions include a current exhaust temperature and an aging factor of the SCR system;

determining a basic amount of NH3 stored corresponding to current operating conditions in the SCR system, comprising:

acquiring a basic storage chart of the SCR system; wherein the basic memory map includes basic storage amounts of NH3 corresponding to combinations of different ones of the exhaust temperatures and different ones of the aging coefficients;

5. The control method of claim 4, wherein obtaining a base stored map of the SCR system comprises:

and determining the basic storage chart according to the plurality of second test points and the plurality of second NH3 demands.

6. A control device of an SCR system, characterized in that the control device comprises:

the second acquisition module is used for determining the basic storage amount of NH3 corresponding to the current working condition in the SCR system;

a second determination module, configured to determine the NH3 target storage amount according to the correction coefficient and the NH3 base storage amount;

7. The control device according to claim 6, characterized by further comprising:

8. The control device according to claim 6, characterized by further comprising:

9. An electronic device, characterized in that the electronic device comprises:

a memory for storing a computer program;

a processor for executing a computer program stored on the memory to implement the method of any one of claims 1 to 5.

10. A vehicle comprising a control apparatus according to any one of claims 6 to 8 to implement the control method according to any one of claims 1 to 5.