CN112576351A - Method, device, equipment and medium for obtaining engine nitrogen oxide model value - Google Patents
Method, device, equipment and medium for obtaining engine nitrogen oxide model value Download PDFInfo
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- CN112576351A CN112576351A CN202011358759.9A CN202011358759A CN112576351A CN 112576351 A CN112576351 A CN 112576351A CN 202011358759 A CN202011358759 A CN 202011358759A CN 112576351 A CN112576351 A CN 112576351A
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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
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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
- 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
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
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- 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
Abstract
The application discloses a method, a device, equipment and a medium for obtaining an engine nitrogen oxide model value. The method comprises the following steps: estimating the volume flow of the exhaust gas of the engine in real time; querying a delay time according to the volume flow; carrying out time delay on the original nitrogen oxide value according to the delay time to obtain a delayed nitrogen oxide value; calculating the change rate of the delayed nitrogen oxide value; comparing the change rate with a preset calibration coefficient to obtain a comparison result; selecting a filter coefficient according to the comparison result, and selectively filtering the delayed nitrogen oxide value by using the selected filter coefficient; and carrying out PT filtering processing on the delayed nitrogen oxide value by using the selected time coefficient. According to the method, the nitrogen oxide model value obtained by processing is more in line with the actual situation, urea is more reasonably sprayed, emission is further reduced, the failure rate of post-processing SCR is reduced, an additional sensor is not needed, and the nitrogen oxide model value is higher in precision.
Description
Technical Field
The application relates to the technical field of engines, in particular to a method, a device, equipment and a medium for obtaining an engine nitrogen oxide model value.
Background
The SCR (Selective Catalytic Reduction) technology is one of the necessary technologies of the existing diesel engine, a urea injection system reasonably injects urea according to NOx discharged by the engine, and the urea is further decomposed into NH at high temperature3NH under the action of an SCR catalyst3And NOx. NOx, i.e., nitrogen oxides, is one of the major emissions pollutants of diesel engines and is primarily composed of NO and NO 2. The SCR device is an after-treatment device for reducing NOx emission, and urea is injected according to the amount of NOx emitted from an engine.
The amount of the NOx originally emitted by the engine determines the urea injection amount, and currently, considering factors such as cost, most engines do not directly adopt a NOx sensor to measure the NOx, but adopt a virtual NOx model to predict, so the accuracy of the NOx model value and the accuracy are important, especially the transient accuracy.
The basic framework of a NOx prediction model commonly used in the current engineering comprises modules with steady-state NOx pulse and transient correction functions, most of model values at present have no or only simple signal processing functions (such as a simple PT filtering form), so that the finally calculated NOx model value and the real actual NOx value still have large difference, and the NOx model value under the transient working condition is not in accordance with the actual condition due to the lack of a scientific and accurate signal processing method, particularly under the strong transient working condition of an engine, so that the post-treatment urea injection is rough, and the problems of discharge failure, even crystallization and the like are further caused.
Disclosure of Invention
The application aims to provide a method, a device, equipment and a medium for acquiring an engine nitrogen oxide model value. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to an aspect of an embodiment of the present application, there is provided a method for obtaining an engine nox model value, including:
estimating the volume flow of the exhaust gas of the engine in real time;
querying a delay time according to the volume flow;
carrying out time delay on the original nitrogen oxide value according to the delay time to obtain a delayed nitrogen oxide value;
calculating the change rate of the delayed nitrogen oxide value;
comparing the change rate with a preset calibration coefficient to obtain a comparison result;
selecting a filter coefficient according to the comparison result, and selectively filtering the delayed nitrogen oxide value by using the selected filter coefficient;
and carrying out PT filtering treatment on the delayed nitrogen oxide value by using the selected time coefficient to obtain a nitrogen oxide model value after PT filtering.
Further, before said time delaying the original nox value according to the delay time, the method further comprises:
obtaining a steady-state nitrogen oxide value according to the rotating speed and the fuel injection quantity of the engine;
and carrying out transient correction on the steady-state nitrogen oxide value to obtain an original nitrogen oxide value.
Further, the estimating in real time a volumetric flow of engine exhaust gas comprises:
acquiring the exhaust temperature and the exhaust pressure of the current working condition according to the operating working condition data of the engine;
and calculating to obtain the volume flow of the exhaust gas according to the exhaust temperature, the exhaust pressure and a Kerberon equation.
Further, the calculating the change rate of the delayed nox value includes:
making a relation curve of the time delay nitrogen oxide value and time;
and calculating the slope of the relation curve of the delayed nitrogen oxide value and the time at a specified moment, wherein the slope is the change rate of the delayed nitrogen oxide value at the specified moment.
Further, the preset calibration coefficients comprise a first calibration coefficient and a second calibration coefficient smaller than the first calibration coefficient; the filter coefficients comprise positive filter coefficients and negative filter coefficients; the selecting a filter coefficient according to the comparison result comprises:
if the change rate is smaller than the first calibration coefficient, selecting the negative filter coefficient;
and if the change rate is greater than the second calibration coefficient, selecting the forward filter coefficient.
According to another aspect of the embodiments of the present application, there is provided an apparatus for obtaining a nox model value of an engine, including:
the volume flow estimation module is used for estimating the volume flow of the exhaust gas of the engine in real time;
the query module is used for querying the delay time according to the volume flow;
the delay module is used for carrying out time delay on the original nitrogen oxide value according to the delay time to obtain a delayed nitrogen oxide value;
the differential module is used for calculating the change rate of the delayed nitrogen oxide value;
the state judgment module is used for comparing the change rate with a preset calibration coefficient to obtain a comparison result;
the selective filtering module is used for selecting a filtering coefficient according to the comparison result and selectively filtering the delayed nitrogen oxide value by using the selected filtering coefficient;
and the PT filtering module is used for carrying out PT filtering processing on the delayed nitrogen oxide value by using the selected time coefficient to obtain a nitrogen oxide model value after PT filtering.
Further, the device also comprises an acquisition module and a correction module;
the acquisition module is used for acquiring a steady-state nitrogen oxide value according to the rotating speed and the fuel injection quantity of the engine;
and the correcting module is used for performing transient correction on the steady-state nitrogen oxide value to obtain the original nitrogen oxide value before the time delay module performs time delay on the original nitrogen oxide value according to the delay time.
Further, the volumetric flow estimation module is specifically configured to:
acquiring the exhaust temperature and the exhaust pressure of the current working condition according to the operating working condition data of the engine;
and calculating to obtain the volume flow of the exhaust gas according to the exhaust temperature, the exhaust pressure and a Kerberon equation.
According to another aspect of the embodiments of the present application, there is provided an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method described above.
According to another aspect of embodiments of the present application, there is provided a computer-readable storage medium having a computer program stored thereon, the program being executed by a processor to implement the above-mentioned method.
The technical scheme provided by one aspect of the embodiment of the application can have the following beneficial effects:
according to the method for acquiring the model value of the nitrogen oxide of the engine, the model value of the nitrogen oxide obtained by processing is more in line with the actual situation, urea is more reasonably sprayed, emission is further reduced, the fault rate of SCR (selective catalytic reduction) post-processing is reduced, an additional sensor is not required to be added, and the precision of the model value of the nitrogen oxide is higher.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the application, or may be learned by the practice of the embodiments. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be 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 described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 illustrates a flow chart of a method for obtaining engine NOx model values according to an embodiment of the present application;
FIG. 2 shows a flowchart of step S10 in the embodiment shown in FIG. 1;
FIG. 3 shows a flowchart of step S60 in the embodiment shown in FIG. 1;
FIG. 4 illustrates a flow chart of a method for obtaining engine NOx model values according to another embodiment of the present application;
FIG. 5 is a block diagram illustrating an apparatus for obtaining an engine NOx model value according to an embodiment of the present application;
FIG. 6 illustrates a block diagram of a steady state NOx calculation module and a transient correction module in another embodiment of the present application;
FIG. 7 is a schematic diagram illustrating the steady state NOx calculation module of FIG. 6 obtaining a steady state NOx value;
fig. 8 shows a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit 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.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As shown in fig. 1, an embodiment of the present application provides a method for obtaining a nox model value of an engine, including:
and S10, estimating the volume flow of the exhaust gas of the engine in real time.
As shown in fig. 2, in some embodiments, step S10 includes:
s101, acquiring the exhaust temperature and the exhaust pressure of the current working condition according to the engine running working condition data.
And S102, calculating to obtain the volume flow of the exhaust gas according to the exhaust temperature, the exhaust pressure and the Kerberon equation.
The krebs equation PV ═ (M/M) RT, P stands for the pressure of the gas in pascals; v represents the volume of gas; m represents the mass of the gas, here a known amount, M represents the molar mass of the gas, and (M/M) gives the number of moles. R is the gas universal constant, R is 8.31J/mol, T is the temperature of the gas in kelvin.
V is calculated by the Kerbolon equation to be (M/M) RT/P.
Specifically, exhaust temperature is calibrated by a first modifier MAP1, and exhaust pressure is calibrated by a second modifier MAP 2. The exhaust temperature is the exhaust temperature of the engine behind the turbine and before the SCR box, and the exhaust pressure refers to the pressure behind the turbine and before the SCR box; the real-time mass flow m is generally a known quantity of the engine and is obtained by summing an air inflow and an oil injection quantity.
And S20, inquiring the delay time according to the volume flow.
Specifically, the delay time Ti is obtained by querying from a preset delay time and volume flow rate correspondence table according to the volume flow rate. The delay time and volume flow rate correspondence table is calibratable, and can be calibrated in advance and stored in the ECU.
And S50, carrying out time delay on the original nitrogen oxide value according to the delay time to obtain a delayed nitrogen oxide value.
Real-time nitrogen oxides reaching the SCR tank can be better fitted by time delaying the original nitrogen oxide values, so that urea injection is more reasonable. The original nitrogen oxide value predicted by the model specifically refers to the value at the exhaust port of the engine, and a section of pipeline is required to pass from the exhaust port to the aftertreatment SCR box (reaching the effect of time delay).
And S60, calculating the change rate of the delayed nitrogen oxide value.
As shown in fig. 3, in some embodiments, step S60 includes:
s601, manufacturing a relation curve of the time delay nitrogen oxide value and time.
Specifically, in a coordinate system, the horizontal axis is time, the vertical axis is a delayed nitrogen oxide value, each point is marked in the coordinate system, the horizontal axis and the vertical axis of each point are time and the delayed nitrogen oxide value corresponding to the time respectively, and a relation curve of the delayed nitrogen oxide value and the time is obtained.
S602, calculating the slope of the relation curve of the delayed nitrogen oxide value and the time at the specified moment, wherein the slope is the change rate of the delayed nitrogen oxide value at the specified moment.
The slope at a certain point on the curve can be calculated by a conventional method, and the details are not repeated herein.
And S70, comparing the change rate with a preset calibration coefficient to obtain a comparison result.
The preset calibration coefficients comprise a first calibration coefficient and a second calibration coefficient smaller than the first calibration coefficient, and are respectively a calibration coefficient 1 and a calibration coefficient 2.
And S80, selecting a filter coefficient according to the comparison result, and performing selective filtering on the delayed nitrogen oxide value by using the selected filter coefficient.
The filter coefficients include positive filter coefficients and negative filter coefficients. The selecting of the filter coefficient according to the comparison result in step S80 includes:
and S801, if the change rate is smaller than the first calibration coefficient, selecting a negative filtering coefficient.
And S802, if the change rate is larger than the second calibration coefficient, selecting a forward filter coefficient.
For example, if the rate of change of the nitroxide is greater than the scaling factor of 2, a positive filter coefficient is selected, and if the rate of change of the nitroxide is less than the scaling factor of 1, a negative filter coefficient is selected. For example: the positive filter coefficient can represent the load increase of an engine, the generation of nitrogen oxides is increased continuously, the negative filter coefficient part represents the load reduction of the engine, and the generation of the nitrogen oxides is reduced continuously. Wherein: the filter coefficients include a positive filter coefficient and a negative filter coefficient, the filter coefficients are obtained by calibration, and the signal input is real-time exhaust volume flow.
S90, using the selected time coefficient T1And carrying out PT filtering treatment on the delayed nitrogen oxide value to obtain a nitrogen oxide model value after PT filtering.
As shown in fig. 4, in some embodiments, before time-delaying the original nox value according to the delay time in step S50, the method further comprises:
and S30, acquiring a steady-state nitrogen oxide value according to the engine speed and the fuel injection quantity.
Specifically, exhaust temperature T is calibrated by MAP1 and exhaust pressure P is calibrated by MAP 2. The exhaust temperature T is the exhaust temperature of the engine behind the turbine and in front of the SCR box, and the exhaust pressure P refers to the pressure behind the turbine and in front of the SCR box; the real-time mass flow m is generally a known quantity of the engine and is obtained by summing an air inflow and an oil injection quantity. Real-time volume flow V of exhaust gasmmCT/P. C is a constant, and may be, for example, 287.5.
And S40, carrying out transient correction on the steady-state nitrogen oxide value to obtain an original nitrogen oxide value.
Specifically, exhaust temperature is calibrated by a first modifier MAP1, and exhaust pressure is calibrated by a second modifier MAP 2. The correction factor is determined according to the rotating speed and the temperature difference between the SCR and the SCR.
According to the method for acquiring the model value of the nitrogen oxide of the engine, the model value of the nitrogen oxide obtained by processing is more in line with the actual situation, urea is more reasonably sprayed, emission is further reduced, the fault rate of SCR (selective catalytic reduction) post-processing is reduced, an additional sensor is not required to be added, and the precision of the model value of the nitrogen oxide is higher.
As shown in fig. 5, an embodiment of the present application provides an apparatus for obtaining a nox model value of an engine, including:
and the volume flow estimation module is used for estimating the volume flow of the exhaust gas of the engine in real time.
In some embodiments, the volumetric flow estimation module is specifically configured to:
acquiring the exhaust temperature and the exhaust pressure of the current working condition according to the operating working condition data (rotating speed and fuel injection quantity) of the engine;
and calculating to obtain the volume flow of the exhaust gas according to the exhaust temperature and the exhaust pressure and the Kerberon equation.
The krebs equation PV ═ (M/M) RT, P stands for the pressure of the gas in pascals; v represents the volume of gas; m represents the mass of the gas, here a known amount, M represents the molar mass of the gas, and (M/M) gives the number of moles. R is the gas universal constant, R is 8.31J/mol, T is the temperature of the gas in kelvin.
V＝(m/M)RT/P。
Specifically, exhaust temperature is calibrated by MAP1 and exhaust pressure is calibrated by MAP 2. The exhaust temperature is the exhaust temperature of the engine behind the turbine and before the SCR box, and the exhaust pressure refers to the pressure behind the turbine and before the SCR box; the real-time mass flow m is generally a known quantity of the engine and is obtained by summing an air inflow and an oil injection quantity.
And the query module is used for querying the delay time Ti according to the volume flow. Specifically, the delay time Ti is obtained by querying from a preset delay time and volume flow rate correspondence table according to the volume flow rate.
And the delay module is used for carrying out time delay on the original nitrogen oxide value according to the delay time Ti obtained by inquiry to obtain a delayed nitrogen oxide value. The delay module can better fit the real-time nitrogen oxides reaching the SCR tank, so that the urea injection is more reasonable. The original nitrogen oxide value predicted by the model specifically refers to the value at the exhaust port of the engine, and a section of pipeline is required to pass from the exhaust port to the aftertreatment SCR box (reaching the effect of time delay).
And the differential module is used for calculating the change rate of the delayed nitrogen oxide value.
Calculating the change rate of the delayed NOx value, including: making a relation curve of the time delay nitrogen oxide value and time; and calculating the slope of the relation curve of the delayed nitrogen oxide value and the time at a certain moment, wherein the slope is the change rate of the delayed nitrogen oxide value at the moment.
And the state judgment module is used for comparing the change rate of the delayed nitrogen oxide value with a preset calibration coefficient to obtain a comparison result.
The preset calibration coefficients include two calibration coefficients, namely a calibration coefficient 1 and a calibration coefficient 2. If the change rate of the nitrogen oxide is larger than a certain calibration value (calibration coefficient 2), the filtering module is selected to select a positive filtering coefficient, and if the change rate of the nitrogen oxide is smaller than a certain calibration value (calibration coefficient 1), the filtering module is selected to select a negative filtering coefficient. For example: the positive filter coefficient can represent the load increase of an engine, the generation of nitrogen oxides is increased continuously, the negative filter coefficient part represents the load reduction of the engine, and the generation of the nitrogen oxides is reduced continuously. Wherein: the filter coefficients include a positive filter coefficient and a negative filter coefficient, the filter coefficients are obtained by calibration, and the signal input is real-time exhaust volume flow.
And the selective filtering module is used for selecting a filtering coefficient according to the comparison result and selectively filtering the delayed nitrogen oxide value by using the selected filtering coefficient. The selective filtering module is used for selecting a filtering coefficient according to a comparison result of the real-time nitrogen oxide value change rate and a preset calibration coefficient.
PT filtering module for utilizing selected time coefficient T1PT filtering processing is carried out on the delayed nitrogen oxide value to obtain PTFiltered nitrogen oxide model values. The signals after PT filtering are smoother and more consistent with the generation rule of the nitrogen oxides of the engine.
As shown in fig. 6, in some embodiments, the apparatus further comprises:
and the steady-state nitrogen oxide calculation module is used for acquiring a steady-state nitrogen oxide value according to the rotating speed and the fuel injection quantity of the engine.
Specifically, exhaust temperature T is calibrated by MAP1 and exhaust pressure P is calibrated by MAP 2. The exhaust temperature T is the exhaust temperature of the engine behind the turbine and in front of the SCR box, and the exhaust pressure P refers to the pressure behind the turbine and in front of the SCR box; the real-time mass flow m is generally a known quantity of the engine and is obtained by summing an air inflow and an oil injection quantity. Real-time volume flow V of exhaust gasmmCT/P. C is a constant, and may be, for example, 287.5. The real-time volumetric flow rate calculation process is shown in fig. 7.
And the transient correction module is used for performing transient correction on the steady-state nitrogen oxide value to obtain the original nitrogen oxide value before the time delay is performed on the original nitrogen oxide value according to the delay time.
The correction factor is determined by the transient correction module according to the rotating speed and the temperature difference between the SCR upstream and the SCR downstream. Exhaust temperature is calibrated by a first modifier MAP1 and exhaust pressure is calibrated by a second modifier MAP 2.
The device for acquiring the model value of the nitrogen oxide of the engine provided by the embodiment of the application can process the obtained model value of the nitrogen oxide to accord with the actual situation, urea is sprayed more reasonably, emission is further reduced, the fault rate of SCR (selective catalytic reduction) post-processing is reduced, an additional sensor is not required to be added, and the precision of the model value of the nitrogen oxide is higher.
Another embodiment of the present application provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for obtaining an engine nox model value according to any one of the above embodiments. As shown in fig. 8, the electronic device 20 may include: the system comprises a processor 200, a memory 201, a bus 202 and a communication interface 203, wherein the processor 200, the communication interface 203 and the memory 201 are connected through the bus 202; the memory 201 stores a computer program that can be executed on the processor 200, and the processor 200 executes the computer program to perform the method provided by any of the foregoing embodiments of the present application.
The Memory 201 may include a high-speed Random Access Memory (RAM), and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 203 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used.
The processor 200 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 200. The Processor 200 may be a general-purpose Processor, and may include a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 201, and the processor 200 reads the information in the memory 201 and completes the steps of the method in combination with the hardware thereof.
Another embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, the program being executed by a processor to implement the method for obtaining an engine nox model value according to any of the above embodiments.
It should be noted that:
the term "module" is not intended to be limited to a particular physical form. Depending on the particular application, a module may be implemented as hardware, firmware, software, and/or combinations thereof. Furthermore, different modules may share common components or even be implemented by the same component. There may or may not be clear boundaries between the various modules.
The algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose devices may be used with the teachings herein. The required structure for constructing such a device will be apparent from the description above. In addition, this application is not directed to any particular programming language. It will be appreciated that a variety of programming languages may be used to implement the teachings of the present application as described herein, and any descriptions of specific languages are provided above to disclose the best modes of the present application.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the application, various features of the application are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this application.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The above-mentioned embodiments only express the embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A method for obtaining an engine nitrogen oxide model value is characterized by comprising the following steps:
estimating the volume flow of the exhaust gas of the engine in real time;
querying a delay time according to the volume flow;
carrying out time delay on the original nitrogen oxide value according to the delay time to obtain a delayed nitrogen oxide value;
calculating the change rate of the delayed nitrogen oxide value;
comparing the change rate with a preset calibration coefficient to obtain a comparison result;
selecting a filter coefficient according to the comparison result, and selectively filtering the delayed nitrogen oxide value by using the selected filter coefficient;
and carrying out PT filtering treatment on the delayed nitrogen oxide value by using the selected time coefficient to obtain a nitrogen oxide model value after PT filtering.
2. The method of claim 1, wherein prior to said time delaying the raw nox value in accordance with the delay time, the method further comprises:
obtaining a steady-state nitrogen oxide value according to the rotating speed and the fuel injection quantity of the engine;
and carrying out transient correction on the steady-state nitrogen oxide value to obtain an original nitrogen oxide value.
3. The method of claim 1, wherein the estimating in real time a volumetric flow rate of engine exhaust gas comprises:
acquiring the exhaust temperature and the exhaust pressure of the current working condition according to the operating working condition data of the engine;
and calculating to obtain the volume flow of the exhaust gas according to the exhaust temperature, the exhaust pressure and a Kerberon equation.
4. The method of claim 1, wherein said calculating a rate of change of said delayed NOx value comprises:
making a relation curve of the time delay nitrogen oxide value and time;
and calculating the slope of the relation curve of the delayed nitrogen oxide value and the time at a specified moment, wherein the slope is the change rate of the delayed nitrogen oxide value at the specified moment.
5. The method of claim 1, wherein the preset calibration coefficients include a first calibration coefficient and a second calibration coefficient that is less than the first calibration coefficient; the filter coefficients comprise positive filter coefficients and negative filter coefficients; the selecting a filter coefficient according to the comparison result comprises:
if the change rate is smaller than the first calibration coefficient, selecting the negative filter coefficient;
and if the change rate is greater than the second calibration coefficient, selecting the forward filter coefficient.
6. An apparatus for obtaining a model value of nitrogen oxides of an engine, comprising:
the volume flow estimation module is used for estimating the volume flow of the exhaust gas of the engine in real time;
the query module is used for querying the delay time according to the volume flow;
the delay module is used for carrying out time delay on the original nitrogen oxide value according to the delay time to obtain a delayed nitrogen oxide value;
the differential module is used for calculating the change rate of the delayed nitrogen oxide value;
the state judgment module is used for comparing the change rate with a preset calibration coefficient to obtain a comparison result;
the selective filtering module is used for selecting a filtering coefficient according to the comparison result and selectively filtering the delayed nitrogen oxide value by using the selected filtering coefficient;
and the PT filtering module is used for carrying out PT filtering processing on the delayed nitrogen oxide value by using the selected time coefficient to obtain a nitrogen oxide model value after PT filtering.
7. The apparatus of claim 6, further comprising an acquisition module and a modification module;
the acquisition module is used for acquiring a steady-state nitrogen oxide value according to the rotating speed and the fuel injection quantity of the engine;
and the correcting module is used for performing transient correction on the steady-state nitrogen oxide value to obtain the original nitrogen oxide value before the time delay module performs time delay on the original nitrogen oxide value according to the delay time.
8. The apparatus of claim 6, wherein the volumetric flow estimation module is specifically configured to:
acquiring the exhaust temperature and the exhaust pressure of the current working condition according to the operating working condition data of the engine;
and calculating to obtain the volume flow of the exhaust gas according to the exhaust temperature, the exhaust pressure and a Kerberon equation.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method of any one of claims 1-5.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the program is executed by a processor to implement the method according to any of claims 1-5.
Priority Applications (1)
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