CN113062792A - SCR fault diagnosis method and device, storage medium and electronic equipment - Google Patents

SCR fault diagnosis method and device, storage medium and electronic equipment Download PDF

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CN113062792A
CN113062792A CN202110496200.0A CN202110496200A CN113062792A CN 113062792 A CN113062792 A CN 113062792A CN 202110496200 A CN202110496200 A CN 202110496200A CN 113062792 A CN113062792 A CN 113062792A
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mass flow
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efficiency
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CN113062792B (en
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谭治学
黄鹏
解同鹏
梁博强
李钊
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1621—Catalyst conversion efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Chemical Kinetics & Catalysis (AREA)
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Abstract

The invention discloses a method and a device for diagnosing SCR (selective catalytic reduction) faults, a storage medium and electronic equipment, wherein a predicted value of the concentration of NOx in gas discharged by SCR is estimated through a current parameter set; calculating to obtain a mass flow predicted value of NOx discharged by the SCR according to the concentration predicted value; calculating the current conversion efficiency of the SCR according to the discharge mass flow of the NOx discharged by the SCR and the input mass flow of the NOx input into the SCR; calculating to obtain a preset efficiency limit value of the SCR according to the first preset limit value and the input mass flow; calculating to obtain a first factor according to the mass flow predicted value, the discharge mass flow and the input mass flow; and determining whether the efficiency diagnosis for the SCR is faulty or not according to the current conversion efficiency, a preset efficiency limit value, a first factor and a preset factor limit value. The method integrates efficiency diagnosis and the first factor, determines whether the conversion efficiency of the SCR is accurate or not, and has better robustness.

Description

SCR fault diagnosis method and device, storage medium and electronic equipment
Technical Field
The invention relates to the field of engines, in particular to a method and a device for diagnosing SCR (selective catalytic reduction) faults, a storage medium and electronic equipment.
Background
During the use of the diesel engine SCR, the NOx conversion efficiency of the SCR needs to be ensured by accurately controlling the urea injection quantity. At the same time, regulations require real-time diagnostics of the NOx conversion efficiency of diesel SCR and require that a fault be declared when emissions exceed a predetermined limit. Because the conversion efficiency of the SCR is influenced by factors such as environment and control, when the environment is suddenly changed or the control has larger deviation, the conversion efficiency of the SCR is monitored, and the robustness of fault alarm is insufficient.
Disclosure of Invention
In view of the above, the present invention provides an SCR fault diagnosis method, apparatus, storage medium, and electronic device that overcome or at least partially solve the above problems.
In a first aspect, a method for diagnosing SCR faults includes:
predicting a predicted value of the concentration of nitrogen oxides NOx in the gas exhausted by the SCR based on a current parameter set, wherein each parameter in the current parameter set is a current parameter obtained by a corresponding sensor, and the current parameter set comprises at least one of the following parameters: inputting a current input concentration of the NOx into the SCR, a current exhaust temperature of the gas emitted by the SCR, and a current exhaust flow rate of the gas emitted by the SCR;
calculating to obtain a predicted value of the mass flow of the NOx discharged by the SCR according to the predicted value of the concentration;
calculating to obtain the current conversion efficiency of the SCR according to the exhaust mass flow of the NOx exhausted by the SCR and the input mass flow of the NOx input into the SCR, wherein the exhaust mass flow and the input mass flow are current parameters obtained through corresponding sensors;
calculating to obtain a preset efficiency limit of the SCR according to a first preset limit and the input mass flow, wherein the first preset limit is a preset limit for the mass flow of the NOx discharged by the SCR;
calculating to obtain a first factor according to the mass flow predicted value, the discharge mass flow and the input mass flow;
and determining whether the efficiency diagnosis for the SCR is faulty or not according to a first comparison result of the current conversion efficiency and the preset efficiency limit value and a second comparison result of the first factor and the preset factor limit value.
With reference to the first aspect, in certain optional embodiments, the determining whether the efficiency diagnosis for the SCR is faulty according to a first comparison result of the current conversion efficiency and the preset efficiency limit and a second comparison result of the first factor and a preset factor limit includes:
if the current conversion efficiency is not greater than the preset efficiency limit and the first factor is not greater than the preset factor limit, determining that the efficiency diagnosis for the SCR is normal, otherwise, determining that the efficiency diagnosis for the SCR is normal.
With reference to the first aspect, in some optional embodiments, the calculating the current conversion efficiency of the SCR according to the exhaust mass flow of the NOx exhausted from the SCR and the input mass flow of the NOx input to the SCR includes:
according to equation 1:
Figure BDA0003054385790000021
calculating the current conversion efficiency of the SCR, wherein the eta isSCRFor the current conversion efficiency, the mNOxDxFor the discharge mass flow rate, mNOxUxIs the input mass flow.
With reference to the first aspect, in some optional embodiments, the calculating a preset efficiency limit of the SCR according to the first preset limit and the input mass flow includes:
according to equation 2:
Figure BDA0003054385790000022
calculating to obtain the preset efficiency limit value, wherein eta isSCRTrdFor the preset efficiency limit, mNOxDxTrdFor the first preset limit value, mNOxUxIs said to outputMass flow rate.
With reference to the first aspect, in some optional embodiments, the calculating a first factor according to the predicted mass flow value, the discharge mass flow and the input mass flow includes:
according to equation 3:
Figure BDA0003054385790000031
calculating the first factor, wherein r iskIs the first factor, the mNOxDxFor the discharge mass flow rate, mNOxUxFor the input mass flow, mNOxDxMdlAnd predicting the mass flow.
With reference to the first aspect, in some alternative embodiments, the predicting a predicted value of the concentration of nitrogen oxide NOx in the exhaust gas of the SCR based on the current parameter set includes:
based on the current parameter group, the concentration predicted value is obtained through calculation of a formula 4, wherein the formula 4 is as follows: v ═ NI × (a × TO + B × TO)2+C×LO+D×LO2+ E), wherein V is the predicted concentration value, NI is the current input concentration, TO is the current exhaust temperature, LO is the current exhaust flow, and A, B, C, D, and E are coefficients.
In a second aspect, an SCR fault diagnosis device includes: the system comprises a concentration prediction value unit, a mass flow prediction value unit, a current conversion efficiency unit, a preset efficiency limit unit, a first factor unit and a fault determination unit;
the concentration prediction value unit is configured to carry out prediction of the concentration prediction value of nitrogen oxide compounds (NOx) in the gas exhausted by the SCR based on a current parameter group, wherein each parameter in the current parameter group is a current parameter obtained by a corresponding sensor, and the current parameter group comprises at least one of the current input concentration of the NOx input into the SCR, the current exhaust temperature of the gas exhausted by the SCR and the current exhaust flow of the gas exhausted by the SCR;
the mass flow prediction value unit is configured to calculate a mass flow prediction value of the NOx discharged by the SCR according to the concentration prediction value;
the current conversion efficiency unit is configured to calculate current conversion efficiency of the SCR according to an exhaust mass flow of the NOx exhausted by the SCR and an input mass flow of the NOx input to the SCR, wherein the exhaust mass flow and the input mass flow are current parameters obtained through corresponding sensors;
the preset efficiency limit unit is configured to calculate a preset efficiency limit of the SCR according to a first preset limit and the input mass flow, wherein the first preset limit is a preset limit for the mass flow of the NOx discharged by the SCR;
the first factor unit is configured to calculate a first factor according to the mass flow prediction value, the discharge mass flow and the input mass flow;
the fault determination unit is configured to perform determining whether an efficiency diagnosis for the SCR is faulty according to a first comparison result of the current conversion efficiency and the preset efficiency limit and a second comparison result of the first factor and a preset factor limit.
With reference to the second aspect, in some optional embodiments, the fault determination unit includes: a first failure determination subunit and a second failure determination subunit;
if the current conversion efficiency is not greater than the preset efficiency limit and the first factor is not greater than the preset factor limit, triggering the first fault determination subunit, otherwise, triggering the second fault determination subunit;
the first fault determination subunit configured to perform determining an efficiency diagnostic fault for the SCR;
the second fault determination subunit configured to perform determining that an efficiency diagnosis for the SCR is normal.
In a third aspect, a storage medium has a program stored thereon, and the program realizes any one of the SCR fault diagnosis methods described above when executed by a processor.
In a fourth aspect, an electronic device includes 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 call program instructions in the memory to perform any one of the SCR fault diagnosis methods described above.
According to the technical scheme, the SCR fault diagnosis method, the device, the storage medium and the electronic equipment can obtain the concentration prediction value of nitrogen oxides NOx in the gas exhausted by SCR through estimation based on the current parameter group, wherein each parameter in the current parameter group is the current parameter obtained through a corresponding sensor, and the current parameter group comprises at least one of the following parameters, namely the current input concentration of the NOx input into the SCR, the current exhaust temperature of the gas exhausted by the SCR and the current exhaust flow of the gas exhausted by the SCR; calculating to obtain a predicted value of the mass flow of the NOx discharged by the SCR according to the predicted value of the concentration; calculating to obtain the current conversion efficiency of the SCR according to the exhaust mass flow of the NOx exhausted by the SCR and the input mass flow of the NOx input into the SCR, wherein the exhaust mass flow and the input mass flow are current parameters obtained through corresponding sensors; calculating to obtain a preset efficiency limit of the SCR according to a first preset limit and the input mass flow, wherein the first preset limit is a preset limit for the mass flow of the NOx discharged by the SCR; calculating to obtain a first factor according to the mass flow predicted value, the discharge mass flow and the input mass flow; and determining whether the efficiency diagnosis for the SCR is faulty or not according to a first comparison result of the current conversion efficiency and the preset efficiency limit value and a second comparison result of the first factor and the preset factor limit value. Therefore, the method can synthesize the diagnosis efficiency and the judgment result of the first factor, accurately determine whether the conversion efficiency of the SCR is accurate or not, namely determine whether the efficiency diagnosis of the SCR is faulty or not, synthesize various parameters for determination, and have good robustness.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart illustrating a method of diagnosing SCR faults provided by the present invention;
fig. 2 is a schematic structural diagram of an SCR fault diagnosis device provided by the present invention;
fig. 3 shows a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, the present invention provides an SCR fault diagnosis method, including:
s100, predicting and obtaining a predicted value of the concentration of nitrogen oxides NOx in the gas exhausted by the SCR based on a current parameter set, wherein each parameter in the current parameter set is a current parameter obtained through a corresponding sensor, and the current parameter set comprises at least one of the following parameters: inputting a current input concentration of the NOx into the SCR, a current exhaust temperature of the gas emitted by the SCR, and a current exhaust flow rate of the gas emitted by the SCR;
optionally, the current parameter set referred to herein may further include: the temperature of the gas input to the SCR and the urea injection amount input to the SCR are not limited in this respect.
Optionally, the method for obtaining the predicted concentration value based on the estimation of the current parameter set is not limited, and any feasible mode belongs to the protection scope of the present invention.
For example, in combination with the embodiment shown in fig. 1, in some alternative embodiments, the S100 includes:
based on the current parameter group, the concentration predicted value is obtained through calculation of a formula 4, wherein the formula 4 is as follows: v ═ NI × (a × TO + B × TO)2+C×LO+D×LO2+ E), wherein V is the predicted concentration value, NI is the current input concentration, TO is the current exhaust temperature, LO is the current exhaust flow, and A, B, C, D, and E are coefficients.
Optionally, the concentration predicted value may be estimated by using a MAP method, a physicochemical model method, a neural network, and other methods based on the current parameter set, which is not limited in the present invention.
S200, calculating to obtain a predicted value of the mass flow of the NOx discharged by the SCR according to the predicted value of the concentration;
optionally, the corresponding mass flow predicted value may be calculated based on the concentration predicted value, which is not limited in the present invention.
For example, the current mass flow rate of the gas exhausted by the SCR may be obtained by a sensor, and then the concentration predicted value is multiplied by the current mass flow rate to obtain the predicted mass flow rate of the NOx, which is not limited in the present invention.
S300, calculating to obtain the current conversion efficiency of the SCR according to the exhaust mass flow of the NOx exhausted by the SCR and the input mass flow of the NOx input into the SCR, wherein the exhaust mass flow and the input mass flow are current parameters obtained through corresponding sensors;
according to the invention, corresponding sensors are respectively arranged at the air inlet and the air outlet of the SCR, so that the exhaust mass flow of the NOx exhausted by the SCR and the input mass flow of the NOx input into the SCR can be acquired in real time, and the invention is not limited to this.
Optionally, in order to reduce interference of data noise, severe fluctuation of NOx, temperature variation and other factors, the exhaust mass flow rate in a time window may be integrated, and the input mass flow rate may also be integrated, and then the current conversion efficiency may be calculated by way of comparison.
For example, in combination with the embodiment shown in fig. 1, in some alternative embodiments, the S300 includes:
according to equation 1:
Figure BDA0003054385790000071
calculating the current conversion efficiency of the SCR, wherein the eta isSCRFor the current conversion efficiency, the mNOxDxFor the discharge mass flow rate, mNOxUxIs the input mass flow.
The upper and lower limits of the integral in the formula may be two different times, that is, the integral of the discharge mass flow and the input mass flow in a period of time, which is not limited in the present invention.
S400, calculating to obtain a preset efficiency limit value of the SCR according to a first preset limit value and the input mass flow, wherein the first preset limit value is a preset limit value aiming at the mass flow of the NOx discharged by the SCR;
alternatively, the first preset limit may be an ideal value that satisfies practical requirements and is obtained through a plurality of tests in advance, and the present invention is not limited thereto.
Optionally, the present invention does not limit the manner of calculating the preset efficiency limit, and any feasible manner belongs to the protection scope of the present invention, which is not limited by the present invention.
For example, in combination with the embodiment shown in fig. 1, in some alternative embodiments, the S400 includes:
according to equation 2:
Figure BDA0003054385790000081
calculating to obtain the preset efficiency limit value, wherein eta isSCRTrdFor the preset efficiency limit, mNOxDxTrdFor the first preset limit value, mNOxUxIs the input mass flow.
Optionally, the upper and lower limits of the integral in the formula may be two different times, that is, the first preset limit and the input mass flow within a period of time are integrated, which is not limited in the present invention.
S500, calculating to obtain a first factor according to the mass flow predicted value, the discharge mass flow and the input mass flow;
optionally, when the first factor is calculated, in order to improve the accuracy of the present invention, the signal noise of the NOx sensor may be filtered, that is, the signal collected by the sensor is filtered by using a low pass filter; meanwhile, in order to avoid signal time misalignment caused by sensor installation position difference between the SCR air inlet and the SCR air outlet, time delay may be performed on the signals collected at the air inlet based on the CURVE function, which is not limited in the present invention.
Optionally, the present invention does not limit the manner of calculating the first factor, and any feasible manner falls into the protection scope of the present invention.
For example, in combination with the embodiment shown in fig. 1, in some alternative embodiments, the S500 includes:
according to equation 3:
Figure BDA0003054385790000082
calculating the first factor, wherein r iskIs the first factor, the mNOxDxFor the discharge mass flow rate, mNOxUxIs said to outputMass flow of said mNOxDxMdlAnd predicting the mass flow.
S600, determining whether the efficiency diagnosis for the SCR is faulty or not according to a first comparison result of the current conversion efficiency and the preset efficiency limit value and a second comparison result of the first factor and the preset factor limit value.
Optionally, the present invention compares and diagnoses the current conversion efficiency, and combines the comparison result of the first factor, and the two methods are used in parallel, so as to improve the robustness of the SCR efficiency diagnosis, which is not limited by the present invention.
For example, in combination with the embodiment shown in fig. 1, in some alternative embodiments, the S600 includes:
if the current conversion efficiency is not greater than the preset efficiency limit and the first factor is not greater than the preset factor limit, determining that the efficiency diagnosis for the SCR is normal, otherwise, determining that the efficiency diagnosis for the SCR is normal.
Optionally, the current conversion efficiency may be compared with the preset efficiency limit to reflect the current performance of the SCR, and the comparison of the first factor with the preset factor limit may reflect the current degradation degree of the engine. The comprehensive judgment is carried out by combining the working condition of the engine and the current performance of the SCR, and the robustness is good.
Alternatively, determining an efficiency diagnostic fault for the SCR may be understood as: the conversion efficiency of the SCR is not higher than a preset efficiency limit, so that NOx entering the SCR cannot be sufficiently converted, further resulting in the concentration of NOx in the gas discharged from the SCR not meeting the specification.
Alternatively, determining that the efficiency diagnosis for the SCR is normal may be understood as: the conversion efficiency of the SCR is above a preset efficiency limit so that NOx entering the SCR is sufficiently converted, further resulting in the concentration of NOx in the gas exiting the SCR meeting specifications.
Optionally, the process of calculating the current conversion efficiency and comparing the current conversion efficiency with the preset efficiency limit value may be executed in a thread or a controller; the process of calculating the first factor and comparing the first factor with the preset factor limit value can be executed in another thread or another controller; that is, the two processes may be two processes running in parallel, and the present invention is not limited thereto.
Optionally, the process of calculating the current conversion efficiency and comparing the current conversion efficiency with the predetermined efficiency limit is performed in a window of relative time since there is time integration. When the integration is completed, the calculation is also completed synchronously, and finally, a first comparison result is obtained by comparing the sizes. The first factor is calculated and compared with the preset factor limit value, but the integration window is short, similar to a pipeline processing mode, and the first factor in the past short time is calculated in real time and is compared with the preset factor limit value in real time. So combining the two processes, the final output is a time series of a certain length, rather than a single value.
Optionally, for the obtained time series, the first factor calculates to obtain a plurality of second comparison results while waiting for the first comparison result of the current conversion efficiency; if the first factor is above a preset factor limit at a time, then all diagnostic logic is terminated as such, determining that the efficiency diagnostic for the SCR is normal. If and only if the first result is: the method determines the efficiency diagnosis fault aiming at the SCR only under the condition that the current conversion efficiency is not higher than a preset efficiency limit value and a first factor is not higher than the preset factor limit value at a certain moment in the middle, so that the reporting condition of the efficiency diagnosis fault aiming at the SCR is intensified, the misjudgment can be prevented, the robustness is improved, and the method is not limited.
As shown in fig. 2, the present invention provides an SCR fault diagnosis apparatus including: the system comprises a concentration prediction value unit 100, a mass flow prediction value unit 200, a current conversion efficiency unit 300, a preset efficiency limit unit 400, a first factor unit 500 and a fault determination unit 600;
the concentration prediction unit 100 is configured to perform prediction of a concentration prediction value of nitrogen oxide compounds NOx in the gas exhausted from the SCR based on a current parameter set, wherein each parameter in the current parameter set is a current parameter obtained by a corresponding sensor, and the current parameter set comprises at least one of a current input concentration of the NOx input into the SCR, a current exhaust temperature of the gas exhausted from the SCR and a current exhaust flow rate of the gas exhausted from the SCR;
the mass flow prediction value unit 200 is configured to calculate a mass flow prediction value of the NOx discharged by the SCR according to the concentration prediction value;
the current conversion efficiency unit 300 is configured to calculate a current conversion efficiency of the SCR according to an exhaust mass flow of the NOx exhausted from the SCR and an input mass flow of the NOx input to the SCR, wherein the exhaust mass flow and the input mass flow are current parameters obtained through corresponding sensors;
the preset efficiency limit unit 400 is configured to calculate a preset efficiency limit of the SCR according to a first preset limit and the input mass flow, where the first preset limit is a preset limit for the mass flow of the NOx discharged by the SCR;
the first factor unit 500 configured to perform a calculation to obtain a first factor according to the predicted mass flow value, the discharge mass flow and the input mass flow;
the fault determination unit 600 is configured to perform determining whether an efficiency diagnosis for the SCR is faulty according to a first comparison result of the current conversion efficiency and the preset efficiency limit and a second comparison result of the first factor and a preset factor limit.
In some optional embodiments, in combination with the embodiment shown in fig. 2, the fault determining unit 600 includes: a first failure determination subunit and a second failure determination subunit;
if the current conversion efficiency is not greater than the preset efficiency limit and the first factor is not greater than the preset factor limit, triggering the first fault determination subunit, otherwise, triggering the second fault determination subunit;
the first fault determination subunit configured to perform determining an efficiency diagnostic fault for the SCR;
the second fault determination subunit configured to perform determining that an efficiency diagnosis for the SCR is normal.
In some alternative embodiments, in combination with the embodiment shown in fig. 2, the current conversion efficiency unit 300 includes: a current conversion efficiency subunit;
the current conversion efficiency subunit configured to perform the following according to equation 1:
Figure BDA0003054385790000111
calculating the current conversion efficiency of the SCR, wherein the eta isSCRFor the current conversion efficiency, the mNOxDxFor the discharge mass flow rate, mNOxUxIs the input mass flow.
In some optional embodiments, in combination with the embodiment shown in fig. 2, the preset efficiency limit unit 400 includes: presetting an efficiency limit subunit;
the preset efficiency limit subunit configured to perform the following according to equation 2:
Figure BDA0003054385790000112
calculating to obtain the preset efficiency limit value, wherein eta isSCRTrdFor the preset efficiency limit, mNOxDxTrdFor the first preset limit value, mNOxUxIs the input mass flow.
In some optional embodiments, in combination with the embodiment shown in fig. 2, the first factor unit 500 includes: a first factor subunit;
the first factor subunit configured to perform according to equation 3:
Figure BDA0003054385790000113
calculating to obtain the secondA factor, wherein rkIs the first factor, the mNOxDxFor the discharge mass flow rate, mNOxUxFor the input mass flow, mNOxDxMdlAnd predicting the mass flow.
In some optional embodiments, in combination with the embodiment shown in fig. 2, the concentration prediction value unit 100 includes: a concentration predictor subunit;
the concentration prediction value sub-unit is configured to perform calculation to obtain the concentration prediction value through formula 4 based on the current parameter group, wherein formula 4: v ═ NI × (a × TO + B × TO)2+C×LO+D×LO2+ E), wherein V is the predicted concentration value, NI is the current input concentration, TO is the current exhaust temperature, LO is the current exhaust flow, and A, B, C, D, and E are coefficients.
The present invention provides a storage medium having a program stored thereon, the program implementing any one of the above-described SCR fault diagnosis methods when executed by a processor.
As shown in fig. 3, the present invention provides an electronic device 70, wherein the electronic device 70 comprises at least one processor 701, at least one memory 702 connected to the processor 701, and a bus 703; the processor 701 and the memory 702 complete communication with each other through the bus 703; the processor 701 is configured to call program instructions in the memory 702 to execute any one of the SCR fault diagnosis methods described above.
In this application, 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 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. To the extent that no more limitation is intended, 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 previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. An SCR fault diagnosis method, comprising:
predicting a predicted value of the concentration of nitrogen oxides NOx in the gas exhausted by the SCR based on a current parameter set, wherein each parameter in the current parameter set is a current parameter obtained by a corresponding sensor, and the current parameter set comprises at least one of the following parameters: inputting a current input concentration of the NOx into the SCR, a current exhaust temperature of the gas emitted by the SCR, and a current exhaust flow rate of the gas emitted by the SCR;
calculating to obtain a predicted value of the mass flow of the NOx discharged by the SCR according to the predicted value of the concentration;
calculating to obtain the current conversion efficiency of the SCR according to the exhaust mass flow of the NOx exhausted by the SCR and the input mass flow of the NOx input into the SCR, wherein the exhaust mass flow and the input mass flow are current parameters obtained through corresponding sensors;
calculating to obtain a preset efficiency limit of the SCR according to a first preset limit and the input mass flow, wherein the first preset limit is a preset limit for the mass flow of the NOx discharged by the SCR;
calculating to obtain a first factor according to the mass flow predicted value, the discharge mass flow and the input mass flow;
and determining whether the efficiency diagnosis for the SCR is faulty or not according to a first comparison result of the current conversion efficiency and the preset efficiency limit value and a second comparison result of the first factor and the preset factor limit value.
2. The SCR fault diagnosis method of claim 1, wherein the determining whether the efficiency diagnosis for the SCR is faulty according to a first comparison result of the current conversion efficiency and the preset efficiency limit and a second comparison result of the first factor and a preset factor limit comprises:
if the current conversion efficiency is not greater than the preset efficiency limit and the first factor is not greater than the preset factor limit, determining that the efficiency diagnosis for the SCR is normal, otherwise, determining that the efficiency diagnosis for the SCR is normal.
3. The SCR fault diagnosis method according to claim 1, wherein the calculating of the current conversion efficiency of the SCR based on an exhaust mass flow rate of the NOx exhausted from the SCR and an input mass flow rate of the NOx input to the SCR comprises:
according to equation 1：
Figure FDA0003054385780000021
Calculating the current conversion efficiency of the SCR, wherein the eta isSCRFor the current conversion efficiency, the mNOxDxFor the discharge mass flow rate, mNOxUxIs the input mass flow.
4. The SCR fault diagnosis method of claim 1, wherein said calculating a preset efficiency limit for the SCR based on a first preset limit and the input mass flow rate comprises:
according to equation 2:
Figure FDA0003054385780000022
calculating to obtain the preset efficiency limit value, wherein eta isSCRTrdFor the preset efficiency limit, mNOxDxTrdFor the first preset limit value, mNOxUxIs the input mass flow.
5. The SCR fault diagnosis method of claim 1, wherein the calculating a first factor based on the predicted mass flow value, the exhaust mass flow and the input mass flow comprises:
according to equation 3:
Figure FDA0003054385780000023
calculating the first factor, wherein r iskIs the first factor, the mNOxDxFor the discharge mass flow rate, mNOxUxFor the input mass flow, mNOxDxMdlAnd predicting the mass flow.
6. The SCR fault diagnosis method according to claim 1, wherein the estimating of the predicted concentration of nitrogen oxides NOx in the gas discharged from the SCR based on the current parameter set includes:
based on the current parameter group, the concentration predicted value is obtained through calculation of a formula 4, wherein the formula 4 is as follows: v ═ NI × (a × TO + B × TO)2+C×LO+D×LO2+ E), wherein V is the predicted concentration value, NI is the current input concentration, TO is the current exhaust temperature, LO is the current exhaust flow, and A, B, C, D, and E are coefficients.
7. An SCR fault diagnosis device characterized by comprising: the system comprises a concentration prediction value unit, a mass flow prediction value unit, a current conversion efficiency unit, a preset efficiency limit unit, a first factor unit and a fault determination unit;
the concentration prediction value unit is configured to carry out prediction of the concentration prediction value of nitrogen oxide compounds (NOx) in the gas exhausted by the SCR based on a current parameter group, wherein each parameter in the current parameter group is a current parameter obtained by a corresponding sensor, and the current parameter group comprises at least one of the current input concentration of the NOx input into the SCR, the current exhaust temperature of the gas exhausted by the SCR and the current exhaust flow of the gas exhausted by the SCR;
the mass flow prediction value unit is configured to calculate a mass flow prediction value of the NOx discharged by the SCR according to the concentration prediction value;
the current conversion efficiency unit is configured to calculate current conversion efficiency of the SCR according to an exhaust mass flow of the NOx exhausted by the SCR and an input mass flow of the NOx input to the SCR, wherein the exhaust mass flow and the input mass flow are current parameters obtained through corresponding sensors;
the preset efficiency limit unit is configured to calculate a preset efficiency limit of the SCR according to a first preset limit and the input mass flow, wherein the first preset limit is a preset limit for the mass flow of the NOx discharged by the SCR;
the first factor unit is configured to calculate a first factor according to the mass flow prediction value, the discharge mass flow and the input mass flow;
the fault determination unit is configured to perform determining whether an efficiency diagnosis for the SCR is faulty according to a first comparison result of the current conversion efficiency and the preset efficiency limit and a second comparison result of the first factor and a preset factor limit.
8. The SCR fault diagnosis device according to claim 7, wherein the fault determination unit includes: a first failure determination subunit and a second failure determination subunit;
if the current conversion efficiency is not greater than the preset efficiency limit and the first factor is not greater than the preset factor limit, triggering the first fault determination subunit, otherwise, triggering the second fault determination subunit;
the first fault determination subunit configured to perform determining an efficiency diagnostic fault for the SCR;
the second fault determination subunit configured to perform determining that an efficiency diagnosis for the SCR is normal.
9. A storage medium having a program stored thereon, wherein the program, when executed by a processor, implements the SCR fault diagnosis method according to any one of claims 1 to 6.
10. An electronic device comprising at least one processor, and at least one memory, bus connected to the processor; the processor and the memory complete mutual communication through the bus; the processor is configured to invoke program instructions in the memory to perform the SCR fault diagnosis method of any one of claims 1 to 6.
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