CN112649320A - Method for determining degree of ageing of oxidation catalyst DOC and related device - Google Patents
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Abstract
The embodiment of the invention provides a method and related equipment for determining the aging degree of an oxidation catalyst DOC (DOC), wherein the method comprises the steps of obtaining a first content, a second content and a first temperature of the DOC under the condition that the DOC meets preset conditions, wherein the first content is Nitrogen Oxide (NO) in gas currently entering the DOCxIn a second amount of NOxNO in currently exhausted gas of selective reduction catalyst SCRxThe first temperature is the current average temperature of the DOC, wherein the SCR is mated to the DOC; the method comprises the following steps that a preset condition comprises a first condition, wherein the first condition is that the content of ammonia gas stored in the SCR is smaller than a preset limit value; obtaining the current reaction airspeed of the DOC, wherein the current reaction airspeed is the gas quantity processed by the DOC in unit volume in unit time; and determining the aging degree of the DOC according to the first content, the second content, the first temperature and the current reaction space velocity. Therefore, the DOC aging degree can be accurately determined through accurate measurement and calculation.
Description
Technical Field
The invention relates to the technical field of aftertreatment systems, in particular to a method for determining the DOC (catalyst oxidation catalyst) aging degree and related equipment.
Background
The oxidation catalyst DOC of the diesel aftertreatment system may oxidize nitric oxide NO to nitrogen dioxide NO2，NO2The ratio is critical to both DPF carbon regeneration and SCR reaction. However, DOC suffers from aging and, with use, the proportion of NO2 decreases. Currently, there is no accurate measurement and calculation means for DOC aging.
The aging curve is typically calibrated based on engine run time or mileage. The aging degree of individual vehicles is calibrated according to the running time or the running mileage, and the result obtained by the method is not accurate enough.
Disclosure of Invention
The invention aims to provide a method and related equipment for determining the DOC aging degree of an oxidation catalyst, so as to accurately determine the DOC aging degree through accurate measurement and calculation. The specific technical scheme is as follows:
in a first aspect, a method of determining oxidation catalyst DOC aging comprises:
obtaining a first content, a second content and a first temperature of the DOC under the condition that the DOC meets preset conditions, wherein the first content is nitrogen oxide NO in gas currently entering the DOCxIn a second amount of NOxThe NO in the currently exhaust gas of a selective reduction catalyst SCRxThe first temperature is a current average temperature of the DOC, wherein the SCR is mated to the DOC;
the preset condition comprises a first condition, wherein the first condition is that the content of ammonia gas stored in the SCR is smaller than a preset limit value;
obtaining a current reaction space velocity of the DOC, wherein the current reaction space velocity is the amount of gas processed by the DOC per unit volume of DOC in unit time;
and determining the aging degree of the DOC according to the first content, the second content, the first temperature and the current reaction space velocity.
With reference to the first aspect, in certain alternative embodiments, the determining the degree of aging of the DOC based on the first content, the second content, the first temperature, and the current reaction space velocity includes:
and searching for the aging degree of the DOC from a preset statistical chart according to the first content, the second content, the first temperature and the current reaction airspeed, wherein the statistical chart stores the corresponding relation between the first content, the second content, the first temperature, the current reaction airspeed and the aging degree of the DOC.
With reference to the first aspect, in certain alternative embodiments, the determining the degree of aging of the DOC based on the first content, the second content, the first temperature, and the current reaction space velocity includes:
calculating to obtain a first ratio of the second content to the first content;
according to the first ratio, from preset nitrogen dioxide NO2Searching in the ratio curve to obtain NO matched with the first ratio2In a ratio of wherein the NO2The ratio curve is a two-dimensional coordinate curve storing the first ratio and the NO2The corresponding relation of the proportion;
according to said NO2Obtaining the current aging degree of the DOC from a preset DOC aging table according to the proportion, the current reaction airspeed and the first temperature, wherein the NO is stored in the preset DOC aging table2The proportion, the current reaction space velocity, the first temperature and the current aging degree of the DOC.
In combination with the above embodiment, in certain alternative embodiments, the NO2The setting process of the proportional curve comprises the following steps:
obtaining 2 parameters of a plurality of DOC (document management interface) standards with different aging degrees respectively under the condition of meeting the preset conditions, wherein the 2 parameters comprise: the first content and the second content;
calculating the first ratio of each DOC calibration piece according to the 2 parameters of each DOC calibration piece;
inputting the first ratio of each DOC calibration to a pre-trained NO2A proportional calculation model to obtain NO matched with the first ratio of each DOC calibration piece respectively2A ratio;
according to the first ratio of each DOC calibration part and each NO2Ratio, setting the NO2A proportional curve.
Optionally, in some optional embodiments, the setting process of the DOC aging table includes:
respectively obtaining four parameters of a plurality of DOC (document management interface) calibration pieces with different aging degrees, wherein the four parameters meet the preset conditions and comprise: said NO2A ratio, the current reaction space velocity, the first temperature, and an age;
and setting the DOC aging table according to the four parameters.
With reference to the first aspect, in certain optional embodiments, the preset condition further includes: at least one of the following two conditions:
secondly, the current flow of the gas entering the DOC is larger than a preset lower flow limit and smaller than a preset upper flow limit;
and thirdly, the current temperature of the SCR is greater than a preset lower temperature limit and less than a preset upper temperature limit.
In combination with the first aspect, in certain alternative embodiments, the first content is the content of nitrogen oxides, NOx, in the gas entering the DOC of the first vehicle on average per second during a first period of time, the second content is the content of said NOx in the gas exiting the NOx selective reduction catalyst, SCR, of the first vehicle on average per second during the first period of time, and the first temperature is the average temperature of the DOC during the first period of time.
In a second aspect, an apparatus for determining the degree of aging of an oxidation catalyst DOC comprises: the device comprises a parameter obtaining unit, a reaction airspeed obtaining unit and a determining unit;
the parameter obtaining unit is configured to obtain a first content, a second content and a first temperature of the DOC under the condition that preset conditions are met, wherein the first content is nitrogen oxide NO in gas currently entering the DOCxIn a second amount of NOxThe NO in the currently exhaust gas of a selective reduction catalyst SCRxThe first temperature is a current average temperature of the DOC, wherein the SCR is mated to the DOC;
the preset condition comprises a first condition, wherein the first condition is that the content of ammonia gas stored in the SCR is smaller than a preset limit value;
the reaction space velocity obtaining unit is configured to obtain a current reaction space velocity of the DOC, and the current reaction space velocity is the amount of gas processed by the DOC in unit volume in unit time;
the determining unit is configured to determine the aging degree of the DOC according to the first content, the second content, the first temperature and the current reaction space velocity.
In a third aspect, a storage medium is provided for storing a program which, when executed by a processor, implements any of the above-described methods for determining oxidation catalyst DOC aging.
In a fourth aspect, a device for determining the degree of aging of an oxidation catalyst DOC, the device comprising at least one processor, and at least one memory, a bus, connected to the processor; the processor and the memory complete mutual communication through the bus; the processor is used for calling a program in the memory, and the program is at least used for realizing the method for determining the aging degree of the oxidation catalyst DOC.
The method and the related device for determining the DOC aging degree of the oxidation catalyst can determine the DOC aging degree more accurately through accurate measurement and calculation. Of course, it is not necessary for any product or method of practicing the invention to achieve all of the above-described advantages at the same time.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method of determining oxidation catalyst DOC aging according to the present invention;
FIG. 2 is a schematic structural diagram of an apparatus for determining the degree of aging of an oxidation catalyst DOC according to the present invention;
fig. 3 is a schematic structural diagram of an apparatus for determining the degree of aging of an oxidation catalyst DOC according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
As shown in fig. 1, the present invention provides a method for determining the degree of aging of an oxidation catalyst DOC, characterized by comprising:
s100, obtaining a first content, a second content and a first temperature of the DOC under the condition that the DOC meets preset conditions, wherein the first content is nitrogen oxide NO in gas currently entering the DOCxIn a second amount of NOxThe NO in the currently exhaust gas of a selective reduction catalyst SCRxThe first temperature is a current average temperature of the DOC, wherein the SCR is mated to the DOC; wherein the preset condition comprises a barThe first condition is that the content of ammonia stored in the SCR is smaller than a preset limit value;
optionally, based on the usage scenario of the present invention, the current aftertreatment system of the diesel vehicle generally includes: DOC, DPF and SCR. Wherein the DOC is used for oxidizing unburned hydrocarbons HC into carbon dioxide and water, carbon monoxide into carbon dioxide, and reducing nitrogen oxides in the exhaust gas; DPF is used to reduce particulate matter in the exhaust gas, and SCR is also used to reduce nitrogen oxides in the exhaust gas. The gas generated by the engine passes through the DOC, the DFP and the SCR in sequence and then is discharged into the atmosphere. It is readily seen that both DOC and SCR reduce nitrogen oxides in the exhaust gas, so to eliminate the effect of SCR on DOC performance calculation, the method of the present invention may be performed while ensuring that the ammonia content stored in the SCR is less than a preset limit. Since the SCR needs to rely on ammonia for reducing the nox in the exhaust gas, if there is no ammonia or the content of ammonia in the SCR is very small, the influence of the SCR on the calculation result can be ignored, which is not limited by the present invention.
Optionally, how to achieve that the content of the ammonia gas stored in the SCR is smaller than the preset limit value can be processed according to actual conditions. For example, urea injection into the SCR can be stopped, and the SCR can be operated for a period of time to consume ammonia in the SCR such that the ammonia content in the SCR is less than a predetermined limit.
Alternatively, the method of the present invention may be performed under more optimal conditions in order to improve the accuracy of determining the degree of DOC aging. For example, in combination with the embodiment shown in fig. 1, in some alternative embodiments, the preset conditions further include: at least one of the following two conditions:
secondly, the current flow of the gas entering the DOC is larger than a preset lower flow limit and smaller than a preset upper flow limit;
and thirdly, the current temperature of the SCR is greater than a preset lower temperature limit and less than a preset upper temperature limit.
Optionally, in view of the limited processing capability of the DOC, in order to accurately reflect the aging degree of the DOC, the flow rate of the gas entering the DOC cannot be too large, and if the flow rate of the gas entering the DOC is too large, the amount of the gas processed by the DOC is too small for the gas entering the DOC, so that the calculated result is not referential. The flow of gas into the DOC can be controlled to be less than the preset upper flow limit.
Optionally, the gas flow into the DOC cannot be too small, and if it is too small, the DOC will quickly reduce the nitrogen oxide content in the exhaust gas to 0 or close to 0. This result is not scientific, i.e., does not accurately reflect the degree of DOC aging, and the present invention is not limited thereto.
Optionally, similarly, the temperature at which the DOC keeps normal and good working is within a certain reasonable range, and when the temperature exceeds the reasonable range, the result obtained by calculation cannot accurately reflect the aging degree of the DOC, so that the current temperature of the DOC can be controlled to be greater than the preset temperature lower limit and smaller than the preset temperature upper limit.
Optionally, the first content, the second content, the first temperature, and the like used in the calculation may be calculated, and if an instantaneous value is adopted, the calculation result may not accurately reflect the aging degree of the DOC due to jitter of the instantaneous value. The average values of the first content, the second content and the first temperature can be used. Therefore, the calculation result of the invention reflects the aging degree of the DOC more accurately, and the invention is not limited to this.
For example, in certain alternative embodiments, in combination with the embodiment shown in fig. 1, the first content is the content of nitrogen oxides NOx in the gas entering the DOC of the first vehicle on average per second during a first period of time, the second content is the content of said NOx in the gas exiting the NOx selective reduction catalyst SCR of the first vehicle on average per second during the first period of time, and the first temperature is the average temperature of the DOC during the first period of time.
S200, obtaining the current reaction space velocity of the DOC, wherein the current reaction space velocity is the gas quantity processed by the DOC in unit volume in unit time;
alternatively, the reaction space velocity is a concept well known to those skilled in the art and is not intended to be limiting in the present invention.
Optionally, the reaction space velocity may reflect the DOC aging degree to a certain extent, so that in order to improve accuracy of the DOC aging degree calculation according to the present invention, the reaction space velocity may be taken into consideration as a parameter, which is not limited by the present invention.
S300, determining the aging degree of the DOC according to the first content, the second content, the first temperature and the current reaction space velocity.
Optionally, the present invention may derive the degree of DOC aging based on a comparison of the first content and the second content. However, the DOC may have different properties due to different temperatures or different reaction space velocities, i.e. the second content may be obtained differently. The degree of aging of a given DOC will vary at different temperatures or different reaction space velocities. In order to exclude the influence of temperature and reaction space velocity on the calculation result, the first temperature and the current reaction space velocity may be considered together, and the present invention is not limited thereto.
Optionally, there may be a plurality of ways to determine the aging degree of the DOC according to the first content, the second content, the first temperature and the current reaction space velocity, and the present invention is not limited thereto. For example, in combination with the embodiment shown in fig. 1, in some alternative embodiments, the step S300 includes:
and searching for the aging degree of the DOC from a preset statistical chart according to the first content, the second content, the first temperature and the current reaction airspeed, wherein the statistical chart stores the corresponding relation between the first content, the second content, the first temperature, the current reaction airspeed and the aging degree of the DOC.
Optionally, the corresponding relationship between the first content, the second content, the first temperature, the current reaction space velocity and the aging degree of the DOC may be a result obtained through a plurality of test tests in advance, and the present invention limits this.
For example, a table of N rows and 5 columns may be constructed based on the results of the experimental tests. The first content, the second content, the first temperature, the current reaction space velocity and the DOC aging degree correspond to one column respectively; n may be selected according to actual needs, and the present invention is not limited thereto. The data for one of the rows may be, in order, the first content, the second content, the first temperature, the current reaction space velocity, and the DOC age for each instance. Thus, the aging degree of the DOC corresponding to the first content, the second content, the first temperature and the current reaction space velocity can be directly checked through the table, which is not limited in the present invention.
Optionally, in order to improve the usability of the present invention, each data in the statistical chart may be a data characterizing a range, not a specific value, and the present invention does not limit this.
For another example, in combination with the embodiment shown in fig. 1, in some alternative embodiments, the step S300 includes:
step one, calculating to obtain a first ratio of the second content to the first content;
optionally, a difference between the second content and the first content or other results that can be used to characterize the difference between the second content and the first content can also be calculated, which is not a limitation of the present invention.
Step two, according to the first ratio, selecting preset nitrogen dioxide NO2Searching in the ratio curve to obtain NO matched with the first ratio2In a ratio of wherein the NO2The ratio curve is a two-dimensional coordinate curve storing the first ratio and the NO2The corresponding relation of the proportion;
optionally, in certain alternative embodiments, the NO is2The setting process of the proportional curve comprises the following steps:
obtaining 2 parameters of a plurality of DOC (document management interface) standards with different aging degrees respectively under the condition of meeting the preset conditions, wherein the 2 parameters comprise: the first content and the second content;
calculating the first ratio of each DOC calibration piece according to the 2 parameters of each DOC calibration piece;
inputting the first ratio of each DOC calibration to a pre-trained NO2Proportional meterCalculating a model to obtain NO matched with the first ratio of each DOC calibration part respectively2A ratio;
according to the first ratio of each DOC calibration part and each NO2Ratio, setting the NO2A proportional curve.
Optionally, the first content in this embodiment is defined the same as the first content in the example of fig. 1, and only describes the difference, the example of fig. 1 describes the DOC whose aging degree is to be determined, and the first content in this embodiment describes the DOC standard.
Optionally, the second content in this embodiment is defined the same as the second content in the example of fig. 1, and only describes the difference, the example of fig. 1 describes the DOC whose aging degree is to be determined, and the second content in this embodiment describes the DOC standard.
Step three, according to the NO2Obtaining the current aging degree of the DOC from a preset DOC aging table according to the proportion, the current reaction airspeed and the first temperature, wherein the NO is stored in the preset DOC aging table2The proportion, the current reaction space velocity, the first temperature and the current aging degree of the DOC.
Optionally, in some optional embodiments, the setting process of the DOC aging table includes:
respectively obtaining four parameters of a plurality of DOC (document management interface) calibration pieces with different aging degrees, wherein the four parameters meet the preset conditions and comprise: said NO2A ratio, the current reaction space velocity, the first temperature, and an age;
and setting the DOC aging table according to the four parameters.
Optionally, in the DOC aging Table, the NO2The ratio, the current reaction space velocity and the first temperature may be input variables and the degree of aging may be the result. I.e. a NO2The ratio, a current reaction space velocity and a first temperature together correspond to an aging level, which is not limited by the present invention.
Optionally, the method provided by the invention can obtain data through measurement, and determine the aging degree of the DOC by calculating according to the data, and the result is relatively accurate.
As shown in fig. 2, the present invention provides an apparatus for determining the degree of aging of an oxidation catalyst DOC, comprising: a parameter obtaining unit 100, a reaction space velocity obtaining unit 200 and a determining unit 300;
the parameter obtaining unit 100 is configured to perform obtaining a first content, a second content and a first temperature of the DOC when preset conditions are met, wherein the first content is nitrogen oxide NO in gas currently entering the DOCxIn a second amount of NOxThe NO in the currently exhaust gas of a selective reduction catalyst SCRxThe first temperature is a current average temperature of the DOC, wherein the SCR is mated to the DOC;
the preset condition comprises a first condition, wherein the first condition is that the content of ammonia gas stored in the SCR is smaller than a preset limit value;
the reaction space velocity obtaining unit 200 is configured to perform obtaining a current reaction space velocity of the DOC, where the current reaction space velocity is a gas amount processed by the DOC per unit volume in unit time;
the determining unit 300 is configured to determine the aging degree of the DOC according to the first content, the second content, the first temperature and the current reaction space velocity.
In some optional embodiments, in combination with the embodiment shown in fig. 2, the determining unit 300 includes: a first determining subunit;
the first determining subunit is configured to search for the aging degree of the DOC from a preset statistical chart according to the first content, the second content, the first temperature and the current reaction airspeed, wherein the statistical chart stores a corresponding relationship among the first content, the second content, the first temperature, the current reaction airspeed and the aging degree of the DOC.
In some optional embodiments, in combination with the embodiment shown in fig. 2, the determining unit 300 includes: a ratio subunit, a proportion subunit and a second determination subunit;
the ratio subunit is configured to perform calculation to obtain a first ratio of the second content to the first content;
the proportional sub-unit is configured to perform a conversion from a preset nitrogen dioxide NO according to the first ratio2Searching in the ratio curve to obtain NO matched with the first ratio2In a ratio of wherein the NO2The ratio curve is a two-dimensional coordinate curve storing the first ratio and the NO2The corresponding relation of the proportion;
the second determination subunit configured to perform the determination according to the NO2Obtaining the current aging degree of the DOC from a preset DOC aging table according to the proportion, the current reaction airspeed and the first temperature, wherein the NO is stored in the preset DOC aging table2The proportion, the current reaction space velocity, the first temperature and the current aging degree of the DOC.
The device for determining the degree of aging of the oxidation catalyst DOC comprises a processor and a memory, wherein the parameter obtaining unit 100, the reaction space velocity obtaining unit 200, the determining unit 300 and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The inner core can be set to be one or more, and the aging degree of the DOC can be accurately determined through accurate measurement and calculation by adjusting the inner core parameters.
An embodiment of the present invention provides a storage medium for storing a program, which when executed by a processor implements any one of the above methods for determining the degree of aging of an oxidation catalyst DOC.
The embodiment of the invention provides a processor, which is used for running a program, wherein the program runs to execute the method for determining the aging degree of an oxidation catalyst DOC.
As shown in fig. 3, the embodiment of the present invention provides an apparatus 70 for determining the degree of aging of an oxidation catalyst DOC, wherein the apparatus 70 comprises at least one processor 701, at least one memory 702 connected with the processor 701, and a bus 703; the processor 701 and the memory 702 complete mutual communication through a bus 703; the processor 701 is configured to call program instructions in the memory 702 to perform the above-described method of determining the degree of aging of the oxidation catalyst DOC. The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program of initializing the steps comprised in the method of determining the degree of ageing of an oxidation catalyst DOC as described above, when executed on a data processing device.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each 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 apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a device includes one or more processors (CPUs), memory, and a bus. The device may also include input/output interfaces, network interfaces, and the like.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip. The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, 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, 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 the like) having computer-usable program code embodied therein.
It is 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. It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method of determining the extent of aging of an oxidation catalyst DOC, comprising:
obtaining a first content, a second content and a first temperature of the DOC under the condition that the DOC meets preset conditions, wherein the first content is nitrogen oxide NO in gas currently entering the DOCxIn a second amount of NOxThe NO in the currently exhaust gas of a selective reduction catalyst SCRxThe first temperature is a current average temperature of the DOC, wherein the SCR is mated to the DOC;
the preset condition comprises a first condition, wherein the first condition is that the content of ammonia gas stored in the SCR is smaller than a preset limit value;
obtaining a current reaction space velocity of the DOC, wherein the current reaction space velocity is the amount of gas processed by the DOC per unit volume of DOC in unit time;
and determining the aging degree of the DOC according to the first content, the second content, the first temperature and the current reaction space velocity.
2. The method of claim 1, wherein determining the degree of aging of the DOC based on the first content, the second content, the first temperature, and the current reaction space velocity comprises:
and searching for the aging degree of the DOC from a preset statistical chart according to the first content, the second content, the first temperature and the current reaction airspeed, wherein the statistical chart stores the corresponding relation between the first content, the second content, the first temperature, the current reaction airspeed and the aging degree of the DOC.
3. The method of claim 1, wherein determining the degree of aging of the DOC based on the first content, the second content, the first temperature, and the current reaction space velocity comprises:
calculating to obtain a first ratio of the second content to the first content;
according to the first ratio, from preset nitrogen dioxide NO2Searching in the ratio curve to obtain NO matched with the first ratio2In a ratio of wherein the NO2The ratio curve is a two-dimensional coordinate curve storing the first ratio and the NO2The corresponding relation of the proportion;
according to said NO2Obtaining the current aging degree of the DOC from a preset DOC aging table according to the proportion, the current reaction airspeed and the first temperature, wherein the NO is stored in the preset DOC aging table2The proportion, the current reaction space velocity, the first temperature and the current aging degree of the DOC.
4. The method according to claim 3, wherein said NO is2The setting process of the proportional curve comprises the following steps:
obtaining 2 parameters of a plurality of DOC (document management interface) standards with different aging degrees respectively under the condition of meeting the preset conditions, wherein the 2 parameters comprise: the first content and the second content;
calculating the first ratio of each DOC calibration piece according to the 2 parameters of each DOC calibration piece;
inputting the first ratio of each DOC calibration to a pre-trained NO2A proportional calculation model to obtain NO matched with the first ratio of each DOC calibration piece respectively2A ratio;
according to the first ratio of each DOC calibration part and each NO2Ratio, setting the NO2A proportional curve.
5. The method of claim 3, wherein the setting of the DOC aging table comprises:
respectively obtaining four parameters of a plurality of DOC (document management interface) calibration pieces with different aging degrees, wherein the four parameters meet the preset conditions and comprise: said NO2A ratio, the current reaction space velocity, the first temperature, and an age;
and setting the DOC aging table according to the four parameters.
6. The method of claim 1, wherein the preset condition further comprises: at least one of the following two conditions:
secondly, the current flow of the gas entering the DOC is larger than a preset lower flow limit and smaller than a preset upper flow limit;
and thirdly, the current temperature of the SCR is greater than a preset lower temperature limit and less than a preset upper temperature limit.
7. The method of claim 1, wherein the first amount is an amount of nitrogen oxides, NOx, in gas entering a DOC of the first vehicle on average per second for a first period of time, the second amount is an amount of the NOx in gas exiting a NOx selective reduction catalyst, SCR, of the first vehicle on average per second for the first period of time, and the first temperature is an average temperature of the DOC during the first period of time.
8. An apparatus for determining the degree of aging of an oxidation catalyst DOC, comprising: the device comprises a parameter obtaining unit, a reaction airspeed obtaining unit and a determining unit;
the parameter obtaining unit is configured to obtain a first content, a second content and a first temperature of the DOC under the condition that preset conditions are met, wherein the first content is nitrogen oxide NO in gas currently entering the DOCxIn a second amount of NOxThe NO in the currently exhaust gas of a selective reduction catalyst SCRxThe first temperature is a current average temperature of the DOC, wherein the SCR is mated to the DOC;
the preset condition comprises a first condition, wherein the first condition is that the content of ammonia gas stored in the SCR is smaller than a preset limit value;
the reaction space velocity obtaining unit is configured to obtain a current reaction space velocity of the DOC, and the current reaction space velocity is the amount of gas processed by the DOC in unit volume in unit time;
the determining unit is configured to determine the aging degree of the DOC according to the first content, the second content, the first temperature and the current reaction space velocity.
9. A storage medium for storing a program which, when executed by a processor, implements the method of determining oxidation catalyst DOC aging degree of any one of claims 1 to 7.
10. An apparatus for determining the degree of ageing of an oxidation catalyst DOC, characterized in that the apparatus comprises at least one processor, and at least one memory, a bus, connected to the processor; the processor and the memory complete mutual communication through the bus; the processor is configured to invoke a program in the memory, the program at least being configured to implement the method of determining oxidation catalyst DOC aging level of any of claims 1 to 7.
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