CN110925066B - Aftertreatment control method and engine - Google Patents
Aftertreatment control method and engine Download PDFInfo
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- CN110925066B CN110925066B CN202010095283.8A CN202010095283A CN110925066B CN 110925066 B CN110925066 B CN 110925066B CN 202010095283 A CN202010095283 A CN 202010095283A CN 110925066 B CN110925066 B CN 110925066B
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/0231—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
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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
- Y02T10/12—Improving ICE efficiencies
-
- 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 belongs to the technical field of engines, and particularly relates to an aftertreatment control method and an engine. The post-processing control method in the application comprises the following steps: calculating real-time NO2Production, NO after DOC output2An amount; calculating real-time passive regeneration response NO2Measuring, outputting NO of DPF internal passive regeneration reaction2An amount; according to actual NO entering SCR2Amount and aftertreatment temperature, calculating NO in SCR2Setting a value control quantity; calculation of NO2Deviation control amount of the NO2Deviation control quantity and NO in said SCR2Set point control amount input to NO2Efficiency model, to realize NO in DOC2And (4) closed-loop control of the content. This application can promote aftertreatment efficiency, promotes passive regeneration rate and SCR conversion efficiency, reduces urea efficiency, reduces the oil consumption to improve fuel economy, promote aftertreatment's security, extension engine and aftertreatment life.
Description
Technical Field
The application belongs to the technical field of engines, and particularly relates to an aftertreatment control method and an engine.
Background
NO in exhaust gas2The content has a higher influence on the efficiency of a DPF (Diesel Particulate Filter) passive regeneration and a SCR (Selective catalytic Reduction) for reducing nitrogen oxides emitted by an engine via a urea injection system, the higher the NO for a DPF passive regeneration2The amount will increase the reaction rate of passive regeneration. Passive regeneration of a DPF relies on the mechanism of post-DOC NO2 reaction with carbon particles within the DPF to reduce the carbon loading of the DPF by
. But at the same time too high NO2The content can reduce the reaction rate of SCR and consume excessive urea; too low NO2The content reduces the reaction rate of passive regeneration and affects the efficiency of SCR. How to realize the cooperative control of DOC (diesel oxidation catalyst), DPF and SCR and realizing the efficient reaction of DPF and SCR is an important problem for the development of aftertreatment.
Disclosure of Invention
The object of the present application is to solve at least the problem of the coordinated control of DOC, DPF and SCR, which is achieved in the following way.
A first aspect of the present application proposes a post-processing control method, including the steps of:
calculating real-time NO2Production, NO after DOC output2An amount;
calculating real-time passive regeneration response NO2Measuring, outputting NO of DPF internal passive regeneration reaction2An amount;
according to actual NO entering SCR2Amount and aftertreatment temperature, calculating NO in SCR2Setting a value control quantity;
calculation of NO2Deviation control amount of the NO2Deviation control quantity and NO in said SCR2Set point control amount input to NO2Efficiency model, to realize NO in DOC2And (4) closed-loop control of the content.
By applying to NO produced in the post-treatment2Real-time calculation is carried out, and NO actually entering SCR is calculated in real time according to the speed of DPF passive regeneration and the efficiency of DOC2And calculating NO in SCR2Set point control amount and NO2Deviation of control quantity, thereby to NO2The content is accurately controlled, the aftertreatment efficiency is improved, the passive regeneration rate and the SCR conversion efficiency are improved, the urea efficiency is reduced, the oil consumption is reduced, the fuel economy is improved, the aftertreatment safety is improved, and the service lives of an engine and aftertreatment are prolonged.
In addition, according to the post-processing control method in the present application, the following additional technical features may be further provided:
in some embodiments of the present application, NO is based on aftertreatment temperature2Calculating the real-time NO comprehensively by an efficiency model and the amount of exhaust gas2The amount produced.
In some embodiments of the present application, the real-time passive regeneration reaction NO is calculated synthetically from the aftertreatment temperature, the passive regeneration rate model, and the DPF internal carbon loading2Amount of the compound (A).
In some embodiments of the present application, a carbon load calculation model is established, from which the DPF internal carbon load is calculated.
In some embodiments of the present application, the actual NO entering the SCR2In an amount equal to NO after DOC2Amount minus NO of DPF internal passive regeneration reaction2Amount of the compound (A).
In some embodiments of the present application, the actual NO entering SCR is calculated by establishing an SCR fast reaction model, an SCR standard reaction model and an SCR slow reaction model2Amount of the compound (A).
In some embodiments of the present application, the NO is2Deviation control quantity is equal to the actual NO entering SCR2Amount minus NO in the SCR2The set point control quantity.
In some embodiments of the present application, the NO is2And starting a thermal management control model by the deviation control quantity, and controlling the post-treatment temperature in a closed loop mode.
In some embodiments of the present application, the aftertreatment control method further includes the step of detecting an intake air temperature, an intake air pressure, an intake air humidity, and an oxygen concentration in an intake passage, and the real-time NO is calculated based on the detected intake air temperature, intake air pressure, intake air humidity, and oxygen concentration2The amount produced.
Another aspect of the present application also proposes an engine including a controller for controlling execution of the aftertreatment control method according to any one of the above.
Drawings
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 application. Also, like parts are designated by like reference numerals throughout the drawings. Wherein:
FIG. 1 is a flow chart of a post-processing control method according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an engine according to an embodiment of the present application.
The reference numerals in the drawings denote the following:
10: an engine;
20: intake pipe, 21: temperature sensor, 22: pressure sensor, 23: humidity sensor, 24: an oxygen concentration sensor;
30: outlet duct, 31: DOC, 32: DPF, 33: SCR;
40: an intercooler;
50: a supercharger;
60: an EGR valve;
70: a urea nozzle.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can 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 invention to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
FIG. 2 is a schematic diagram of an embodiment of the present applicationThe structure of the motive machine is schematically shown. As shown in fig. 2, the engine 10 in the present embodiment is a diesel engine, in which the direction of the arrow is the airflow direction. An air inlet pipe 20 is connected to an air inlet end of the engine 10, and an air outlet pipe 30 is connected to an air outlet end. A temperature sensor 21, a pressure sensor 22, a humidity sensor 23 and an oxygen concentration sensor 24 are arranged in the air inlet pipe 20, so that the temperature, the pressure, the humidity and the oxygen concentration of the inlet air entering the engine 10 can be detected, and the NO generated by the engine 10 in real time can be calculated according to the detected values2Amount of the compound (A). The temperature sensor 21, the pressure sensor 22, the humidity sensor 23 and the oxygen concentration sensor 24 are not fixedly arranged in the arrangement order, so that the detection purpose is achieved.
The DOC31, the DPF32 and the SCR33 are sequentially arranged in the outlet pipe 30 along the flowing direction of exhaust gas, part of the exhaust gas of the engine 10 is discharged through the outlet pipe 30 and sequentially passes through the DOC31, the DPF32 and the SCR33, so that NO in the exhaust gas of the engine 10 is treated2Effective treatment is carried out, and pollution is reduced. The outlet end of the engine 10 is provided with a urea nozzle 70, and urea is injected into the outlet pipe 30 through the urea nozzle 70 to generate ammonia NH3, so as to reduce nitrogen oxides discharged from the engine 10. The main reactions taking place inside the outlet duct 30 are as follows: wherein the content of the first and second substances,
standard reaction: 4NH3+4NO+O2=4N2+6H2O；
And (3) quick reaction: 4NH3+2NO+2NO2=4N2+6H2O；
Slow reaction: 8 NH3+6NO2=7N2+6H2O。
Another part of the exhaust gas of the engine 10 flows back to the intake end of the engine 10 through another circulation line, so that the exhaust gas is recycled. The amount of exhaust gas recirculated is controlled by providing an EGR valve 60 in the exhaust gas recirculation line.
Further, a supercharger 50 is further arranged between the air inlet end and the air outlet end of the engine 10, an intercooler 40 is further arranged between the air inlet end of the engine 10 and the supercharger 50, and the intercooler 40 is used for cooling the supercharged air inlet, so that the air inlet amount of the engine 10 is improved, and the efficiency of the engine 10 is improved.
Further, the engine 10 of the present application further includes a controller for controlling the reaction temperature of the engine 10 after-treatment process, thereby controlling the real-time NO of the after-treatment2Generating amount and controlling the cooperation of DOC31, DPF32 and SCR33 to accurately control NO2The reaction amount of (c).
Specifically, as shown in fig. 1, in some embodiments of the present application, a post-processing control method includes the steps of:
calculating real-time NO2Production, NO after DOC output2Amount of the compound (A).
In particular, according to the aftertreatment temperature, NO2Efficiency model and exhaust gas quantity integrated calculation real-time NO2The amount produced.
Wherein the post-treatment temperature is detected by a temperature sensor disposed in the outlet pipe 30, NO2The efficiency model is established by techniques known to those skilled in the art, and the amount of exhaust gas can be calculated based on the amount of fuel burned in the engine 10. NO obtained by comprehensive calculation2The generated quantity is NO after DOC output2Amount of the compound (A).
Calculating real-time passive regeneration response NO2Measuring, outputting NO of DPF internal passive regeneration reaction2Amount of the compound (A).
Specifically, the real-time passive regeneration reaction NO is comprehensively calculated according to the aftertreatment temperature, the passive regeneration rate model and the internal carbon load of the DPF2Quantity, i.e. NO, which is output for passive regeneration reaction inside DPF2Amount of the compound (A).
And calculating the carbon loading in the DPF according to the carbon loading calculation model by establishing the carbon loading calculation model. The carbon loading calculation model and the establishment of the passive regeneration rate model are all technical means well known to those skilled in the art.
According to actual NO entering SCR2Amount and aftertreatment temperature, calculating NO in SCR2The set point control quantity.
Wherein NO actually enters SCR2The amount can be obtained by calculation. By establishing an SCR fast reaction model, an SCR standard reaction model and an SCR slow reaction model meterCalculating actual NO entering SCR2Amount of the compound (A). The establishment of the SCR fast reaction model, the SCR standard reaction model and the SCR slow reaction model is a technical means well known to those skilled in the art.
Actual NO into SCR2NO after the amount can also pass through DOC2Amount minus NO of DPF internal passive regeneration reaction2And (4) obtaining the quantity.
Calculation of NO2Deviation control amount of NO2Deviation control amount and NO in SCR2Set point control amount input to NO2Efficiency model, to realize NO in DOC2Closed loop control of the content.
NO2Deviation control quantity is equal to actual NO entering SCR2Amount minus NO in SCR2The set point control quantity. Actual NO into SCR2Amount and NO in SCR2The set point control amount can be obtained by the foregoing. By adding NO2Deviation control amount input to NO2In the efficiency model, the data is fed back to the controller, the thermal management control model is started through the controller, and the aftertreatment temperature is controlled in a closed loop mode, so that the aftertreatment temperature is controlled according to actual reaction requirements, and NO in the aftertreatment process is accurately controlled2And (4) content.
By applying to NO produced in the post-treatment2The method comprises the steps of calculating the amount in real time, calculating the content of NO2 actually entering the SCR in real time according to the speed of DPF passive regeneration and the efficiency of DOC, and calculating the control amount of a NO2 set value and the control amount of NO2 deviation in the SCR, so that the content of NO2 is accurately controlled, the aftertreatment efficiency is improved, the passive regeneration speed and the SCR conversion efficiency are improved, the urea efficiency is reduced, the oil consumption is reduced, the fuel economy is improved, the aftertreatment safety is improved, and the service lives of an engine and aftertreatment are prolonged.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A post-processing control method, characterized by comprising the steps of:
calculating real-time NO2Production, NO after DOC output2An amount;
calculating real-time passive regeneration response NO2Measuring, outputting NO of DPF internal passive regeneration reaction2An amount;
according to actual NO entering SCR2Amount and aftertreatment temperature, calculating NO in SCR2Setting a value control quantity;
calculation of NO2Deviation control amount, said NO2Deviation control quantity is equal to the actual NO entering SCR2Amount minus NO in the SCR2Set value control amount, the NO2Deviation control quantity and NO in said SCR2Set point control amount input to NO2Efficiency model, to realize NO in DOC2And (4) closed-loop control of the content.
2. The aftertreatment control method of claim 1, wherein NO is based on aftertreatment temperature2Calculating the real-time NO comprehensively by an efficiency model and the amount of exhaust gas2The amount produced.
3. The aftertreatment control method of claim 1, wherein the real-time passive regeneration reaction NO is calculated synthetically from the aftertreatment temperature, the passive regeneration rate model, and the DPF internal carbon loading2Amount of the compound (A).
4. The aftertreatment control method of claim 3, wherein a carbon load calculation model is established, and the DPF internal carbon load is calculated according to the carbon load calculation model.
5. The aftertreatment control method of claim 1, wherein the actual NO entering SCR2In an amount equal to NO after DOC2Amount minus NO of DPF internal passive regeneration reaction2Amount of the compound (A).
6. The aftertreatment control method of claim 1, wherein the actual NO entering SCR is calculated by establishing an SCR fast reaction model, an SCR standard reaction model, and an SCR slow reaction model2Amount of the compound (A).
7. The aftertreatment control method of claim 1, wherein the NO is based on2And starting a thermal management control model by the deviation control quantity, and controlling the post-treatment temperature in a closed loop mode.
8. The aftertreatment control method of claim 1, further comprising a step of detecting an intake air temperature, an intake air pressure, an intake air humidity, and an oxygen concentration in an intake passage, the real-time NO being calculated based on the detected intake air temperature, intake air pressure, intake air humidity, and oxygen concentration2The amount produced.
9. An engine comprising a controller, characterized in that the controller is configured to control execution of the aftertreatment control method according to any one of claims 1 to 8.
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| CN101482047A (en) * | 2008-01-10 | 2009-07-15 | 赫多特普索化工设备公司 | Method and system for purification of exhaust gas from diesel engines |
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