CN114961929B - Control method, device terminal and readable storage medium of two-stage post-processing system - Google Patents
Control method, device terminal and readable storage medium of two-stage post-processing system Download PDFInfo
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- CN114961929B CN114961929B CN202110525037.6A CN202110525037A CN114961929B CN 114961929 B CN114961929 B CN 114961929B CN 202110525037 A CN202110525037 A CN 202110525037A CN 114961929 B CN114961929 B CN 114961929B
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- 238000000034 method Methods 0.000 title claims abstract description 67
- 238000012805 post-processing Methods 0.000 title description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 195
- 238000006243 chemical reaction Methods 0.000 claims abstract description 65
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000004202 carbamide Substances 0.000 claims abstract description 23
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 70
- 238000012937 correction Methods 0.000 claims description 53
- 239000007789 gas Substances 0.000 claims description 40
- 229910021529 ammonia Inorganic materials 0.000 claims description 35
- 239000003054 catalyst Substances 0.000 claims description 20
- 230000009977 dual effect Effects 0.000 claims description 18
- 238000009529 body temperature measurement Methods 0.000 claims description 17
- 230000004044 response Effects 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 12
- 238000010531 catalytic reduction reaction Methods 0.000 claims description 10
- 230000003197 catalytic effect Effects 0.000 claims description 9
- 230000003993 interaction Effects 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 25
- 238000010586 diagram Methods 0.000 description 14
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- 238000011144 upstream manufacturing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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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
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- F01N2610/146—Control thereof, e.g. control of injectors or injection valves
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application relates to a control method and device terminal of a two-stage aftertreatment system and a readable storage medium, and relates to the field of diesel engine aftertreatment system control. The method comprises the following steps: sending a first control signal to a first nozzle; sending a second control signal to the second nozzle, the second control signal instructing the second nozzle to output a second medium, the second medium comprising urea; receiving a diesel engine working parameter of a diesel engine connected with the two-stage aftertreatment system, and adjusting the output quantity of the first medium based on the diesel engine working parameter and the system working parameter of the two-stage aftertreatment system; and adjusting the output quantity of the second medium based on the system operating parameters of the two-stage aftertreatment system. In the whole reaction process, the terminal equipment processes and controls the data of the reaction module and the device in the medium input module. By means of the method of classifying and treating the nitrogen oxides, the treatment efficiency of the nitrogen oxides is improved under the condition of cold start.
Description
Technical Field
The application relates to the field of diesel engine aftertreatment system control, in particular to a control method, a control device, a control terminal and a readable storage medium of a two-stage aftertreatment system.
Background
After diesel engine burns diesel, exhaust gas is ejected. The exhaust gas contains a variety of harmful substances including, but not limited to, carbon monoxide, nitrogen oxides, and carbonaceous particulates. Therefore, the exhaust gas discharged from the diesel engine needs to be subjected to strict aftertreatment.
In the related art, in the process of performing exhaust gas aftertreatment, an exhaust gas aftertreatment system is set based on a world coordination transient Cycle (World Harmonized Transient Cycle, WHTC) standard and a world steady state test Cycle (World Harmonized Steady-state Cycle, WHSC), and finally the exhaust gas aftertreatment system is arranged to be a combination of an oxidation catalytic device (Diesel Oxidation Catalyst, DOC), a catalytic particulate trapping device for a diesel engine (catalytic-Diesel Particulate Filter, cDPF), a selective catalytic reduction device (Selective Catalytic Reduction, SCR) and an ammonia slip catalytic device (Ammonia Slip Catalyst, ASC) which are sequentially connected according to the related national standard. After the gas discharged by the diesel engine is output to the tail gas aftertreatment system, the aftertreatment system can purify the tail gas step by step, so that the tail gas finally meets the emission standard and is discharged.
However, the aftertreatment method of the related art requires a long time for SCR to turn on at the time of cold start, resulting in low conversion efficiency of oxides in the aftertreatment system.
Disclosure of Invention
The application relates to a control method of a two-stage aftertreatment system, a device terminal and a readable storage medium, which can improve the conversion efficiency of oxides. The technical scheme is as follows:
in one aspect, a control method of a two-stage post-processing system is provided, and the method is applied to terminal equipment of the two-stage post-processing system, wherein the two-stage post-processing system comprises a reaction module, a medium input module and the terminal equipment;
the medium input module is connected with the reaction module, the reaction module and the medium input module are respectively connected with the terminal equipment, and the terminal equipment is used for controlling the reaction module, the medium input module and performing data interaction;
the reaction module comprises a cc-SCR (catalytic reduction unit cc-selective catalytic reduction), a DOC (oxidation catalytic unit) and a cDPF (catalytic particulate trap) for a diesel engine, an SCR (selective catalytic reduction) and an ASC (ammonia slip catalytic unit) which are sequentially connected;
the medium input module comprises a first nozzle and a second nozzle, wherein the medium output end of the first nozzle is connected with the medium input end of the cc-SCR, and the medium output end of the second nozzle is connected with the medium input end of the SCR
The method comprises the following steps:
transmitting a first control signal to the first nozzle, the first control signal instructing the first nozzle to output a first medium, the first medium comprising urea;
sending a second control signal to the second nozzle, the second control signal instructing the second nozzle to output a second medium, the second medium comprising urea;
receiving diesel engine working parameters of a diesel engine connected with the two-stage aftertreatment system;
adjusting the output quantity of the first medium based on the diesel engine operating parameters and the system operating parameters of the two-stage aftertreatment system;
and adjusting the output quantity of the second medium based on the system working parameters of the two-stage aftertreatment system.
In another aspect, a control apparatus for a dual stage aftertreatment system is provided, the apparatus comprising:
a sending module for sending a first control signal to the first nozzle, the first control signal instructing the first nozzle to output a first medium, the first medium comprising urea;
sending a second control signal to the second nozzle, the second control signal instructing the second nozzle to output a second medium, the second medium comprising urea;
The receiving module is used for receiving the working parameters of the diesel engine connected with the two-stage aftertreatment system;
the adjusting module is used for adjusting the output quantity of the first medium based on the working parameters of the diesel engine and the working parameters of the system of the two-stage aftertreatment system;
and adjusting the output quantity of the second medium based on the system working parameters of the two-stage aftertreatment system.
In another aspect, a computer device is provided, where the computer device includes a processor and a memory, where the memory stores at least one instruction, at least one program, a code set, or an instruction set, and the processor may load and execute the at least one instruction, the at least one program, the code set, or the instruction set, so as to implement a control method of the dual-stage post-processing system provided in the embodiment of the present application.
In another aspect, a computer readable storage medium is provided, where at least one instruction, at least one program, a code set, or an instruction set is stored in the readable storage medium, and a processor may load and execute the at least one instruction, the at least one program, the code set, or the instruction set, so as to implement a control method of the dual-stage post-processing system provided in the embodiment of the present application.
In another aspect, a computer program product or computer program is provided, the computer program product or computer program comprising computer program instructions stored in a computer readable storage medium. The processor reads the computer instructions from the computer-readable storage medium and executes the computer instructions to cause the computer device to execute the control method of the dual-stage aftertreatment system as provided in the embodiments of the present application.
The technical scheme provided by the application has the beneficial effects that at least:
by additionally arranging the first nozzle and the cc-SCR corresponding to the first nozzle in front of a traditional exhaust aftertreatment system, the cc-SCR can be quickly heated in the exhaust emission process, and after the cc-SCR is matched with a medium sprayed by the first nozzle, the reaction environment for reducing the nitrogen oxides is pretreated, and the nitrogen oxides are eliminated through the rear-end SCR. Meanwhile, in the whole reaction process, the terminal equipment processes and controls the data of the devices in the reaction module and the medium input module. By means of the method of classifying and treating the nitrogen oxides, the treatment efficiency of the nitrogen oxides is improved under the condition of rapid cold start.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 illustrates a schematic diagram of a related art aftertreatment system;
FIG. 2 illustrates a schematic diagram of an aftertreatment system, provided in accordance with an exemplary embodiment of the present disclosure;
FIG. 3 illustrates a flow chart of a control method for a dual stage aftertreatment system provided in accordance with an exemplary embodiment of the present disclosure;
FIG. 4 illustrates a schematic diagram of a dual stage aftertreatment system, provided in accordance with an exemplary embodiment of the present disclosure;
FIG. 5 illustrates a flow chart of a control method for a dual stage aftertreatment system, provided by an exemplary embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a first medium output and a second medium output determination process according to an exemplary embodiment of the present application;
FIG. 7 is a schematic diagram of a process for obtaining closed loop correction coefficients according to an exemplary embodiment of the present application;
FIG. 8 illustrates a control device architecture diagram of a dual stage aftertreatment system, provided in accordance with an exemplary embodiment of the present disclosure;
FIG. 9 illustrates a structural framework diagram of another computer device executing a control method of a dual-stage aftertreatment system, provided by an exemplary embodiment of the present application;
fig. 10 is a block diagram showing a control method of a dual-stage aftertreatment system according to an exemplary embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
In order to meet the national pollutant emission standard of the motor vehicle in the sixth stage, the tail gas generated by diesel combustion contains various toxic and harmful substances, so that after the tail gas is generated by diesel combustion, the tail gas needs to be subjected to post-treatment. Fig. 1 shows a schematic diagram of an aftertreatment system of the related art, referring to fig. 1, including a DOC110, a cDPF120, an SCR130, and an ASC140, which are connected to each other. In the aftertreatment system, a first temperature sensor 151 for measuring the temperature at the output of the DOC110 and a second temperature sensor 152 for measuring the temperature at the medium output of the cDPF120 are also included. In the related art, a differential pressure sensor 153 connected in parallel with the cDPF120 is also included.
However, the post-treatment method in the related art requires a long time for SCR to turn on at the time of cold start, resulting in low conversion efficiency of oxides in the post-treatment system.
In order to meet the emission requirements in future national standards and industry standards, the application provides a two-stage aftertreatment system and a control method of the two-stage aftertreatment system, which can effectively improve the conversion efficiency of oxides and meet the national standards and industry standards which are put forward subsequently.
Fig. 2 shows a schematic structural diagram of an aftertreatment system according to an exemplary embodiment of the present disclosure. The system comprises a reaction module 210, a medium input module 220 and a terminal device 230;
the medium input module 220 is connected with the reaction module 210, and the reaction module 210 and the medium input module 220 are respectively connected with the terminal device 230, wherein the terminal device 230 is used for controlling and data interaction of the reaction module 210 and the medium input module 220;
the reaction module 210 includes a close-coupled selective catalytic reduction device (cc-SCR) 211, a DOC212, a cDPF213, an SCR214, and an ASC215, which are sequentially connected;
the media input module 220 includes a first nozzle 221 and a second nozzle 222, the media output of the first nozzle 221 being connected to the media input of the cc-SCR211, the media output of the second nozzle 222 being connected to the media input of the SCR 214.
In the embodiment of the application, the medium in the first nozzle and the second nozzle can react with the nitrogen oxides in the tail gas to reduce the nitrogen oxides. In an embodiment of the application, the medium in the first nozzle and the second nozzle is urea. The application is not limited to the medium in the first nozzle and the second nozzle provided that the requirements for the reduction of nitrogen oxides in cc-SCR and SCR are met.
In an embodiment of the application DOC, cDPF, SCR and ASC are a combination of devices that are adapted to national sixth stage automotive pollutant emission standards. On the basis of the sequential connection of the devices, cc-SCR is added before the medium input end of DOC. In one example, the cc-SCR is installed in the first stage after exhaust emission, optionally at the outlet of the turbocharger; the temperature can be quickly increased when the engine is cold started, and under the action of a catalyst in cc-SCR when the medium is sprayed out from the first nozzle, the nitrogen oxide is pretreated before the tail gas enters the DOC, so that the content of the nitrogen oxide in the tail gas is reduced.
In the embodiment of the application, the terminal equipment establishes connection with each device in the reaction module and the medium input module. The terminal device may receive the data sent by each device, and establish an output feedback adjustment mechanism for each device by processing each data. In one example, the terminal device receives flow data sent by the first nozzle and adjusts the injection quantity of the first nozzle according to the flow data.
Corresponding to the two-stage aftertreatment system shown in fig. 2, fig. 3 shows a flowchart of a control method of the two-stage aftertreatment system according to an exemplary embodiment of the present application, and the method is applied to a terminal device of the two-stage aftertreatment system for explanation, where the method includes:
step 301 sends a first control signal to a first nozzle, the first control signal instructing the first nozzle to output a first medium, the first medium comprising urea.
In the embodiment of the application, the terminal equipment is realized as a computer.
The embodiment of the application is a process of adjusting the medium output quantity of the first nozzle and the second nozzle through the terminal equipment. In the tail gas treatment process, the output time and output quantity of the first nozzle and the second nozzle are required to be controlled so as to prevent insufficient reduction of nitrogen oxides, and meanwhile, excessive nitrogen oxides are prevented from being eliminated by cc-SCR, and the passive regeneration effect of the cDPF is prevented from being influenced.
In the embodiment of the application, the first control signal is a control signal generated by the terminal equipment according to the overall working condition of the post-processing system after receiving the flow of the first nozzle, and the first control signal is used for controlling the output quantity of the first medium of the first nozzle. In an embodiment of the application, the first medium is urea.
After the first control signal is sent to the first nozzle, the first nozzle performs at least one of the functions of starting up, increasing the first medium flow, decreasing the first medium flow, maintaining the first medium flow, and stopping the operation according to the control signal.
Step 302, a second control signal is sent to a second nozzle, the second control signal directing the second nozzle to output a second medium, the second medium comprising urea.
The second medium may be the same medium as the first medium or may be a medium different from the first medium. In an embodiment of the application, the second medium is the same as the first medium, i.e. the second medium is also urea.
Similarly, after the second control signal is sent to the second nozzle, the second nozzle performs at least one of the functions of starting operation, increasing the second medium flow rate, decreasing the second medium flow rate, maintaining the second medium flow rate, and stopping operation in accordance with the control signal.
Step 303, receiving diesel engine operating parameters of a diesel engine coupled to the dual stage aftertreatment system.
In an embodiment of the present application, a dual stage aftertreatment system is interconnected with a diesel engine. In one example, the cc-SCR is coupled to a turbocharger outlet of a diesel engine. The terminal device is also connected to the diesel engine to receive various operating parameters of the diesel engine. In one example, the operating parameters of the diesel engine include at least one of an engine speed of the diesel engine, a transmitter torque of the diesel engine, and an operating temperature of the diesel engine.
Step 304, the output of the first medium is adjusted based on the diesel engine operating parameters and the system operating parameters of the dual stage aftertreatment system.
In step 305, an output of the second medium is adjusted based on system operating parameters of the dual stage aftertreatment system.
Steps 304 to 305 are adjusting the output of the first medium and the output of the second medium in the terminal device based on the system operating parameters of the two-stage aftertreatment system and the operating parameters of the diesel engine system. In steps 304-305, since the first nozzle is connecting urea input cc-SCR to the diesel engine, the output of the first medium is related to both the diesel engine operating parameters and the dual stage aftertreatment system; the second nozzle inputs urea into the SCR, and since the SCR is not connected to the diesel engine, the output of the second medium is only related to the operating parameters of the dual stage aftertreatment system.
In summary, according to the control method of the two-stage aftertreatment system provided by the embodiment of the application, the first nozzle and the cc-SCR corresponding to the first nozzle are additionally arranged in front of the traditional exhaust aftertreatment system, so that the cc-SCR can be quickly heated in the exhaust emission process, and after the cc-SCR is matched with the reaction environment in which the first nozzle sprays out a medium, the reduction of the nitrogen oxides is performed, and after the pretreatment, the elimination of the nitrogen oxides is performed through the rear-end SCR. Meanwhile, in the whole reaction process, the terminal equipment processes and controls the data of the devices in the reaction module and the medium input module. By means of the method of classifying and treating the nitrogen oxides, the treatment efficiency of the nitrogen oxides is improved under the condition of rapid cold start.
In some embodiments of the present application, the two-stage aftertreatment system further includes a measurement module, where the measurement module includes a plurality of measurement devices, so as to collect data such as medium working conditions and device working conditions in the exhaust gas treatment process. FIG. 4 illustrates a schematic diagram of a dual stage aftertreatment system, according to an exemplary embodiment of the present disclosure. The dual stage aftertreatment system includes a reaction module 410, a media input module 420, a terminal device 430, and a measurement module 440. The medium input module 420 is connected with the reaction module 410, the reaction module 410 and the medium input module 420 are respectively connected with the terminal device 430, the terminal device 430 is used for controlling and data interaction of the reaction module 410 and the medium input module 420, and the measurement module 440 is connected with the terminal device 430 and performs data interaction with the terminal device 430; the reaction module 410 includes a close-coupled selective catalytic reduction device (cc-SCR) 411, a DOC412, a cDPF413, an SCR414, and an ASC415, which are sequentially connected; the media input module 420 includes a first nozzle 421 having a media output coupled to a media input of the cc-SCR411 and a second nozzle 422 having a media output coupled to a media input of the SCR 414. The measurement module 440 includes a first temperature measurement device 441 located at the media input of the cc-SCR411, a second temperature measurement 442 located at the media input of the SCR414, and a third temperature measurement device 443 located at the media input of the ASC 415.
The setting positions of the corresponding measuring devices are known, the first temperature measuring device is used for measuring the medium temperature of the input cc-SCR, the second temperature measuring device is used for measuring the medium temperature of the input SCR, and the third temperature measuring device is used for measuring the medium temperature of the input ASC.
Corresponding to the two-stage post-processing system. FIG. 5 illustrates a flow chart of a control method for a dual stage aftertreatment system, according to an exemplary embodiment of the present disclosure. Referring to fig. 5, the method is applied to a terminal device in a dual-stage post-processing system, and includes:
step 501 sends a first control signal to a first nozzle, the first control signal instructing the first nozzle to output a first medium, the first medium comprising urea.
Step 502 sends a second control signal to the second nozzle, the second control signal directing the second nozzle to output a second medium, the second medium comprising urea.
Steps 501 to 502 are the same as steps 301 to 302, i.e. the process of controlling the first nozzle and the second nozzle by sending the first control signal and the second control signal. In the embodiment of the application, the first medium is the medium output by the first nozzle, and the second medium is the medium output by the second nozzle. In one example, the first nozzle and the second nozzle are both urea.
Step 503 receives a first temperature of a media input of a cc-SCR of a first temperature measurement device.
In the embodiment of the application, the first temperature measuring device is used for measuring the temperature of the medium input end of the cc-SCR, namely the temperature when the reaction in the cc-SCR occurs, so that the first temperature measuring device is needed to be set for controlling the reaction temperature.
In step 504, the operating mode of the cc-SCR is determined to be a first operating mode in response to the engine speed and the engine torque being within the rated operating range and the first temperature not reaching the first temperature threshold.
In an embodiment of the application, the operating state of the diesel engine is one of the criteria for the operating mode of the cc-SCR. In an embodiment of the application, the diesel engine operating parameters include exhaust gas flow mass, engine speed, and engine torque. The cc-SCR corresponds to three different modes of operation, the specific operating state of which is determined by the model of the cc-SCR. In the embodiment of the application. When the engine speed and the engine torque of the diesel engine are within the rated operating ranges, i.e. the diesel engine is in normal operation and in the process of generating exhaust gas, the cc-SCR has different operating modes for adaptation corresponding to different temperatures.
It should be noted that the present application relates to a plurality of thresholds in addition to the first temperature threshold. In one example, the plurality of thresholds may be values pre-stored in the terminal device, which are invoked when the terminal device performs the corresponding steps; in another example, the plurality of thresholds are values that are set immediately when the terminal device performs the corresponding step. The present application is not limited to the actual form and generation of each threshold.
In step 505, responsive to the engine speed and the engine torque being within the rated operating range, the first temperature reaches a first temperature threshold and the first temperature does not reach a second temperature threshold, the operating mode of the cc-SCR is determined to be a second operating mode, the second temperature threshold being higher than the first temperature threshold.
In step 506, the operating mode of the cc-SCR is determined to be the third operating mode in response to the engine speed and the engine torque being within the rated operating range and the first temperature reaching the second temperature threshold.
Steps 504 through 506 illustrate the operating conditions of the three modes of operation of the cc-SCR in an embodiment of the present application. In the embodiment of the application, the cc-SCR has a first working mode, a second working mode and a third working mode corresponding to a first temperature threshold value and a second temperature threshold value in the terminal. The three modes of operation correspond to different temperature ranges. Specifically, when the temperature detected by the first temperature measurement device does not reach the first temperature threshold value, determining that the working mode is the first working mode; when the temperature detected by the first temperature measuring equipment reaches a first temperature threshold value and does not reach a second temperature threshold value, determining that the working mode is a second working mode; and when the temperature detected by the first temperature measuring equipment reaches the second temperature threshold value, determining the working mode as a third working mode. In one example, the first mode of operation may be referred to as a low temperature mode of operation, the second mode of operation may be referred to as a medium temperature mode of operation, and the third mode of operation may be referred to as a high temperature mode of operation.
After steps 504-506 are performed, the first nozzle may be controlled to adjust the output of the first nozzle by adjusting the output of the first medium in combination with the nox content, nox conversion efficiency, and exhaust gas mass flow at the medium output of the cc-SCR according to the finally determined operation mode.
Step 507, receiving a second temperature of a medium input of the SCR sent by a second temperature measurement device.
In the embodiment of the application, the medium input end of the SCR is correspondingly connected with second temperature measuring equipment, and the second temperature is the temperature at which the reaction is carried out inside the SCR.
In step 508, operation of the second nozzle is stopped in response to the second temperature not reaching the start-up temperature threshold.
In the embodiment of the application, in order to ensure the working efficiency of the SCR, the second nozzle is not controlled to work when the second temperature does not reach the starting temperature threshold.
Step 509, in response to the second temperature reaching the start-up temperature threshold, adjusts the output of the second medium in combination with the exhaust flow mass, the nitrogen oxide content at the medium output of the SCR, and the nitrogen oxide conversion efficiency.
In the embodiment of the application, when the second temperature reaches the start-up temperature threshold, the terminal equipment can control the second nozzle to start working so as to output the second medium. In the embodiment of the application, the reference working parameters of the output quantity of the second medium are the exhaust gas mass flow, the nitrogen oxide content of the output end of the SCR medium and the nitrogen oxide conversion efficiency.
Step 510, determining an ammonia storage correction factor based on the exhaust mass flow, the output of the second medium, the second temperature, the third temperature, the catalyst temperature of the dual-stage aftertreatment system, and the flow of the medium output of the SCR in combination with the ammonia storage value in the SCR.
After determining the output quantity of the second medium, the two-stage post-treatment system needs to correspond to the closed-loop correction coefficient, and the output quantity of the second medium is adjusted timely.
In an embodiment of the present application, the parameters that constitute the closed-loop correction factor include an ammonia storage correction factor and an nox correction factor.
In an embodiment of the application, the ammonia storage correction factor is a factor calculated based on an ammonia storage value in the SCR, the ammonia storage correction factor being related to the exhaust gas mass flow, the output of the second medium, the temperature of the catalyst in the SCR, the flow of the SCR medium output, the second temperature of the SCR medium input, and the third temperature of the ASC medium input.
In the embodiment of the application, corresponding to the ammonia storage correction coefficient, a program is arranged in the terminal equipment, and the function of executing an ammonia storage proportional-integral-derivative (Proportion Integral Differential, PID) closed-loop model is used for determining the ammonia storage correction coefficient.
In step 511, an actual NOx efficiency value is determined based on the exhaust gas mass flow, the output of the second medium, the second temperature, the third temperature, the catalyst temperature of the dual-stage aftertreatment system, and the NOx content of the dual-stage aftertreatment system.
Step 512, comparing the actual nox efficiency value with the target nox efficiency value, and determining a nox efficiency correction coefficient based on the target nox efficiency value and the actual nox efficiency value, where the target nox efficiency value is a preset efficiency value stored in the terminal device.
Steps 511 to 512 are the process of determining the nox efficiency correction factor. In the embodiment of the application, the NOx efficiency correction coefficient is determined based on the NOx efficiency value of the system, and a comparison process of the actual NOx efficiency value and a preset NOx efficiency value is required.
In the embodiment of the application, the terminal equipment is provided with a program corresponding to the generation process of the nitrogen oxide efficiency correction coefficient, and the function of the nitrogen oxide efficiency PID closed-loop model is executed for determining the nitrogen oxide correction coefficient.
In step 513, a closed loop correction factor is determined based on the NOx correction factor and the ammonia storage correction factor.
In the embodiment of the application, the closed-loop correction coefficient is the sum of the NOx correction coefficient and the ammonia storage correction coefficient. In other embodiments of the present application, the closed loop correction factor may be the product of the nox correction factor and the ammonia storage correction factor, or the closed loop correction factor may be a weighted sum of the nox correction factor and the ammonia storage correction factor. The embodiment of the application does not limit the specific generation method of the closed loop correction coefficient.
And step 514, performing secondary adjustment on the output quantity of the second medium through the closed-loop correction coefficient.
After determining the closed-loop correction factor, a subsequent adjustment of the output of the second medium can be performed by means of the closed-loop correction factor.
In summary, according to the control method of the two-stage aftertreatment system provided by the embodiment of the application, the first nozzle and the cc-SCR corresponding to the first nozzle are additionally arranged in front of the traditional exhaust aftertreatment system, so that the cc-SCR can be quickly heated in the exhaust emission process, and after the cc-SCR is matched with the reaction environment in which the first nozzle sprays out a medium, the reduction of the nitrogen oxides is performed, and after the pretreatment, the elimination of the nitrogen oxides is performed through the rear-end SCR. Meanwhile, in the whole reaction process, the terminal equipment processes and controls the data of the devices in the reaction module and the medium input module. By means of the method of classifying and treating the nitrogen oxides, the treatment efficiency of the nitrogen oxides is improved under the condition of rapid cold start.
By arranging a plurality of measuring devices in the two-stage aftertreatment system, the working conditions of the two-stage aftertreatment system are adapted in the working process of the two-stage aftertreatment system, the working states of the first nozzle and the second nozzle are determined, and the treatment efficiency of nitrogen oxides is further improved.
The closed loop correction coefficient is finally obtained and the output quantity of the second medium is controlled by detecting various working conditions in the system in real time and executing the parameter determining process of the ammonia storage PID closed loop model and the nitrogen oxide PID closed loop model through the program in the terminal equipment, so that the nitrogen oxide treatment efficiency is further improved.
Fig. 6 is a schematic diagram showing a process for determining the first medium output and the second medium output according to an exemplary embodiment of the present application. Please refer to fig. 6. In the determination, the first medium output demand is divided into a cc-SCR signal processing module 611 and a first medium output calculation module 612 using an open loop control mode.
The cc-SCR signal processing module 611 functions to obtain real-time nox mass flow values and exhaust gas mass flow in a dual-stage aftertreatment system based on a diesel engine speed, torque signal look-up table. And looking up a cc-SCR catalyst conversion efficiency table according to the temperature value of the first temperature to obtain the conversion efficiency of the catalyst. And judging a cc-SCR working mode according to the first temperature, enabling the cc-SCR catalyst to act in a cold state, and preventing excessive treatment nitrogen oxides after the temperature is increased from affecting the DPF passive regeneration efficiency at the downstream of the system. When the first temperature does not reach the first temperature threshold, the cc-SCR is in a first operating mode; when the first temperature reaches a first temperature threshold and does not reach a second temperature threshold, the cc-SCR is in a third working mode; when the first temperature reaches the second temperature threshold, the cc-SCR is in a third mode of operation.
The first medium output calculation module 612 calculates the theoretical urea injection demand of the first nozzle in real time according to the calculated systematic nox mass flow, nox conversion efficiency, and exhaust mass flow by the cc-SCR signal processing module 611, and determines whether the medium output is normal according to the cc-SCR operation mode.
The output quantity of the second medium adopts an open-loop and closed-loop control strategy, the closed-loop module is divided into an ammonia storage closed-loop and a nitrogen oxide efficiency closed-loop, and the input quantity of the closed-loop module is from the calculated value of the SCR chemical reaction model.
The open loop module is divided into an SCR signal processing module 621 and a second medium output open loop calculation module 622. The SCR signal processing module 621 looks up a table according to the exhaust mass flow rate and the second temperature to obtain SCR catalyst conversion efficiency; and determining the SCR working mode according to the second temperature. The second medium output open loop calculation module 622 calculates a theoretical urea injection based on the NOx sensor measurement, the exhaust gas mass flow, and the NOx conversion efficiency upstream of the SCR, and determines whether to perform medium output based on the SCR operating mode. The SCR modes of operation fall into two categories: when the second temperature is smaller than the spraying starting temperature set value, the second medium is not output; when the second temperature is greater than or equal to the spraying starting temperature set value, the second medium is output according to the preset value.
The closed loop module is divided into an SCR chemical reaction module 631 and a closed loop control module 632, wherein the SCR chemical reaction module 621 calculates the chemical reaction process occurring inside the SCR catalyst, and calculates and outputs a real-time ammonia storage value and a nitrogen oxide efficiency value to the closed loop control module 632. Fig. 7 is a schematic diagram of a process for obtaining a closed-loop correction coefficient according to an exemplary embodiment of the present application. Referring to fig. 7, the process mainly includes an SCR temperature field model 701, an ammonia adsorption and desorption model 702, and a nitrogen oxide reaction model 703. The SCR temperature field model calculates the temperature on the SCR catalyst in real time according to the second temperature, the third temperature and the exhaust gas mass flow rate and the heat transfer principle; the ammonia adsorption and desorption model 702 calculates the ammonia value of adsorption and desorption in the catalyst in real time according to the output of the second medium and the temperature of the catalyst, and calculates the ammonia storage value stored in the catalyst; the nitrogen oxide reaction model 703 calculates the theoretical reaction process of nitrogen oxide and ammonia in real time according to the upstream nitrogen oxide value and the catalyst temperature, and obtains the nitrogen oxide efficiency value.
The closed-loop control module is divided into an ammonia storage PID closed-loop control model 6321 and a nitrogen oxide efficiency PID closed-loop control model 6322, and outputs closed-loop correction coefficients respectively, and adds to obtain a total closed-loop correction coefficient. The ammonia storage PID closed-loop control model 6321 carries out real-time PID calculation according to the ammonia storage value calculated by the SCR chemical reaction model and the calibrated target value to obtain an ammonia storage correction value; the nitrogen oxide efficiency PID closed-loop control module 6322 performs real-time PID calculation to obtain a nitrogen oxide efficiency correction value according to the nitrogen oxide efficiency value and the target nitrogen oxide efficiency value calculated by the SCR chemical reaction model, and finally determines a closed-loop correction coefficient to adjust the output quantity of the second medium.
FIG. 8 illustrates a block diagram of a control device for a dual stage aftertreatment system, including:
a sending module 801 configured to send a first control signal to the first nozzle, where the first control signal instructs the first nozzle to output a first medium, and the first medium includes urea;
sending a second control signal to the second nozzle, the second control signal instructing the second nozzle to output a second medium, the second medium comprising urea;
a receiving module 802, configured to receive a diesel engine operating parameter of a diesel engine connected to the dual-stage aftertreatment system;
an adjustment module 803 for adjusting the output of the first medium based on the diesel engine operating parameter and the system operating parameter of the dual-stage aftertreatment system;
and adjusting the output quantity of the second medium based on the system working parameters of the two-stage aftertreatment system.
In an alternative embodiment, the dual stage aftertreatment system further includes a measurement module including a first temperature measurement device;
the first temperature measurement device is positioned at the medium input end of the cc-SCR and is used for measuring the temperature of the medium input end of the cc-SCR;
The diesel engine operating parameters include exhaust gas flow mass, engine speed and engine torque;
a receiving module 802, configured to receive a first temperature of a medium input terminal of the cc-SCR sent by the first temperature measurement device;
referring to FIG. 9, the apparatus further includes a determination module 804 for determining an operating mode of the cc-SCR based on the first temperature, the engine speed, and the engine torque;
the adjusting module 803 is further configured to adjust the output of the first medium in combination with the nitrogen oxide content, the nitrogen oxide conversion efficiency and the exhaust gas mass flow rate at the medium output of the cc-SCR based on the operation mode.
In an alternative embodiment, the engine speed corresponds to a nominal operating range for the engine torque;
a determining module 804 further configured to determine that the operating mode of the cc-SCR is a first operating mode in response to the engine speed and the engine torque being within the rated operating range and the first temperature not reaching a first temperature threshold;
determining that the cc-SCR operating mode is a second operating mode in response to the engine speed and the engine torque being within the rated operating range, the first temperature reaching a first temperature threshold and the first temperature not reaching a second temperature threshold, the second temperature threshold being higher than the first temperature threshold;
And determining that the operation mode of the cc-SCR is a third operation mode when the engine speed and the engine torque are within the rated operation range and the first temperature reaches a second temperature threshold.
In an alternative embodiment, the measurement module includes a second temperature measurement device located at the medium input of the SCR for measuring the temperature of the medium input of the SCR;
the receiving module 802 is further configured to receive a second temperature of the medium input end of the SCR sent by the second temperature measurement device;
the apparatus further comprises a stopping module 805 for stopping the operation of the second nozzle in response to the second temperature not reaching a start-up temperature threshold;
the adjusting module 803 is further configured to adjust an output of the second medium in combination with a nitrogen oxide content, a nitrogen oxide conversion efficiency, and the exhaust gas mass flow rate of the medium output of the SCR in response to the second temperature reaching a start-up temperature threshold.
In an alternative embodiment, after the output of the second medium is adjusted in conjunction with the nox content at the medium output of the SCR and the nox conversion efficiency in response to the second temperature reaching a start-up temperature threshold,
A determining module 804, configured to determine a closed loop correction coefficient corresponding to the output of the second medium;
the adjusting module 803 is further configured to perform a secondary adjustment on the output of the second medium through the closed loop correction coefficient.
In an alternative embodiment, the measurement module further comprises a third temperature measurement device;
the third temperature measuring device is positioned at the medium output end of the SCR and is used for measuring the temperature of the medium output end of the SCR;
a determining module 804, further configured to determine an ammonia storage correction coefficient based on the exhaust gas mass flow, the second temperature, the third temperature, a catalyst temperature of the dual-stage aftertreatment system, and a flow rate of a medium output of the SCR in combination with an ammonia storage value in the SCR;
determining an actual nox efficiency value based on the exhaust gas mass flow, the second temperature, the third temperature, a catalyst temperature of the dual-stage aftertreatment system, and a nox content in the dual-stage aftertreatment system;
the apparatus further includes a comparing module 806, configured to compare the actual nox efficiency value with a target nox efficiency value, and determine a nox efficiency correction coefficient based on the target nox efficiency value and the actual nox efficiency value, where the target nox efficiency value is a preset efficiency value stored in the terminal device;
The determining module 804 is further configured to determine the closed loop correction factor based on the nox correction factor and the ammonia storage correction factor.
According to the device provided by the embodiment of the application, the first nozzle and the cc-SCR corresponding to the first nozzle are additionally arranged in front of the traditional tail gas aftertreatment system, so that the cc-SCR can be quickly heated in the tail gas emission process, the reaction environment for reducing the nitrogen oxides after the cc-SCR is matched with the medium sprayed by the first nozzle, and the nitrogen oxides are eliminated through the rear-end SCR after pretreatment. Meanwhile, in the whole reaction process, the terminal equipment processes and controls the data of the devices in the reaction module and the medium input module. By means of the method of classifying and treating the nitrogen oxides, the treatment efficiency of the nitrogen oxides is improved under the condition of rapid cold start.
It should be noted that: the control device of the two-stage aftertreatment system provided in the above embodiment is only exemplified by the division of the above functional modules, and in practical application, the above functional allocation may be performed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to perform all or part of the functions described above.
Fig. 10 is a schematic structural view of a computer device for executing a control method of a dual-stage aftertreatment system according to an exemplary embodiment of the present application, the computer device including:
the processor 1001 includes one or more processing cores, and the processor 1001 executes various functional applications and data processing by running software programs and modules.
The receiver 1002 and the transmitter 1003 may be implemented as one communication component, which may be a communication chip. Alternatively, the communication component may be implemented to include a signaling function. That is, the transmitter 1003 may be used to transmit control signals to the image acquisition device as well as the scanning device, and the receiver 1002 may be used to receive corresponding feedback instructions.
The memory 1004 is connected to the processor 1001 through a bus 1005.
The memory 1004 may be used for storing at least one instruction that the processor 1001 uses to execute to implement the various steps in the method embodiments described above.
The embodiment of the application also provides a computer readable storage medium, wherein at least one instruction, at least one section of program, code set or instruction set is stored in the readable storage medium, so as to be loaded and executed by a processor to realize the control method of the two-stage post-processing system.
The present application also provides a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the control method of the dual-stage aftertreatment system according to any one of the above embodiments.
Alternatively, the computer-readable storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), solid state disk (SSD, solid State Drives), or optical disk, etc. The random access memory may include resistive random access memory (ReRAM, resistance Random Access Memory) and dynamic random access memory (DRAM, dynamic Random Access Memory), among others. The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, and the program may be stored in a computer readable storage medium, where the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements within the spirit and principles of the present application.
Claims (4)
1. The control method of the two-stage aftertreatment system is characterized by being applied to terminal equipment of the two-stage aftertreatment system, wherein the two-stage aftertreatment system comprises a reaction module, a medium input module and the terminal equipment; the medium input module is connected with the reaction module, the reaction module and the medium input module are respectively connected with the terminal equipment, and the terminal equipment is used for controlling and data interaction of the reaction module and the medium input module;
the reaction module comprises a cc-SCR (catalytic reduction unit cc-selective catalytic reduction), a DOC (oxidation catalytic unit) and a cDPF (catalytic particulate trap) for a diesel engine, an SCR (selective catalytic reduction) and an ASC (ammonia slip catalytic unit) which are sequentially connected;
the medium input module comprises a first nozzle and a second nozzle, wherein the medium output end of the first nozzle is connected with the medium input end of the cc-SCR, and the medium output end of the second nozzle is connected with the medium input end of the SCR;
The method comprises the following steps:
transmitting a first control signal to the first nozzle, the first control signal instructing the first nozzle to output a first medium, the first medium comprising urea;
sending a second control signal to the second nozzle, the second control signal instructing the second nozzle to output a second medium, the second medium comprising urea;
receiving diesel engine working parameters of a diesel engine connected with the two-stage aftertreatment system;
adjusting the output quantity of the first medium based on the diesel engine operating parameters and the system operating parameters of the two-stage aftertreatment system;
adjusting the output of the second medium based on system operating parameters of the dual-stage aftertreatment system;
the dual-stage aftertreatment system further includes a measurement module including a first temperature measurement device;
the first temperature measurement device is positioned at the medium input end of the cc-SCR and is used for measuring the temperature of the medium input end of the cc-SCR;
the diesel engine operating parameters include exhaust gas mass flow, engine speed and engine torque;
the adjusting the output of the first medium based on the diesel engine operating parameter and the system operating parameter of the dual-stage aftertreatment system includes:
Receiving a first temperature of a medium input end of the cc-SCR sent by the first temperature measurement device;
determining an operating mode of the cc-SCR based on the first temperature, the engine speed, and the engine torque;
based on the operating mode, adjusting the output of the first medium in combination with the nitrogen oxide content, the nitrogen oxide conversion efficiency, and the exhaust gas mass flow of the medium output of the cc-SCR;
the engine speed and the engine torque correspond to a rated operating range;
the determining an operating mode of the cc-SCR based on the first temperature, the engine speed, and the engine torque includes:
determining that the operating mode of the cc-SCR is a first operating mode in response to the engine speed and the engine torque being within the rated operating range and the first temperature not reaching a first temperature threshold;
determining that the cc-SCR operating mode is a second operating mode in response to the engine speed and the engine torque being within the rated operating range, the first temperature reaching a first temperature threshold and the first temperature not reaching a second temperature threshold, the second temperature threshold being higher than the first temperature threshold;
Determining that the cc-SCR operating mode is a third operating mode in response to the engine speed and the engine torque being within the rated operating range and the first temperature reaching a second temperature threshold;
the measuring module comprises a second temperature measuring device which is positioned at the medium input end of the SCR and is used for measuring the temperature of the medium input end of the SCR;
the adjusting the output of the second medium based on the system operating parameters of the dual-stage aftertreatment system includes:
receiving a second temperature of a medium input end of the SCR sent by the second temperature measurement equipment;
stopping operation of the second nozzle in response to the second temperature not reaching a start-up temperature threshold;
responding to the second temperature reaching a start-up temperature threshold, and adjusting the output quantity of the second medium by combining the nitrogen oxide content, the nitrogen oxide conversion efficiency and the exhaust gas mass flow of the medium output end of the SCR;
after the output quantity of the second medium is adjusted in combination with the nitrogen oxide content, the nitrogen oxide conversion efficiency and the exhaust gas mass flow rate of the medium output end of the SCR in response to the second temperature reaching the start-up temperature threshold, the method further comprises:
Determining a closed loop correction factor corresponding to an output of the second medium;
the output quantity of the second medium is secondarily adjusted through the closed loop correction coefficient;
the measurement module further comprises a third temperature measurement device;
the third temperature measuring device is positioned at the medium output end of the SCR and is used for measuring the temperature of the medium output end of the SCR;
the determining a closed loop correction factor corresponding to an output quantity of the second medium includes:
determining an ammonia storage correction coefficient based on the exhaust gas mass flow, the second temperature, the third temperature, a catalyst temperature of the dual-stage aftertreatment system, and a flow rate of a medium output of the SCR in combination with an ammonia storage value in the SCR;
determining an actual nox efficiency value based on the exhaust gas mass flow, the second temperature, the third temperature, a catalyst temperature of the dual-stage aftertreatment system, and a nox content in the dual-stage aftertreatment system;
comparing the actual nitrogen oxide efficiency value with a target nitrogen oxide efficiency value, and determining a nitrogen oxide efficiency correction coefficient based on the target nitrogen oxide efficiency value and the actual nitrogen oxide efficiency value, wherein the target nitrogen oxide efficiency value is a preset efficiency value stored in the terminal equipment;
The closed loop correction factor is determined based on the nox efficiency correction factor and the ammonia storage correction factor.
2. A control apparatus of a dual-stage aftertreatment system for implementing the control method of the dual-stage aftertreatment system of claim 1, the control apparatus comprising:
a sending module for sending a first control signal to a first nozzle, the first control signal instructing the first nozzle to output a first medium, the first medium comprising urea;
transmitting a second control signal to a second nozzle, the second control signal instructing the second nozzle to output a second medium, the second medium comprising urea;
the receiving module is used for receiving the working parameters of the diesel engine connected with the two-stage aftertreatment system;
the adjusting module is used for adjusting the output quantity of the first medium based on the working parameters of the diesel engine and the working parameters of the system of the two-stage aftertreatment system;
and adjusting the output quantity of the second medium based on the system working parameters of the two-stage aftertreatment system.
3. A computer device comprising a processor and a memory having stored therein at least one instruction, at least one program, code set, or instruction set that is loaded and executed by the processor to implement the method of controlling a dual stage aftertreatment system of claim 1.
4. A computer readable storage medium having stored therein at least one instruction, at least one program, code set, or instruction set loaded and executed by a processor to implement the method of controlling a dual stage aftertreatment system of claim 1.
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| DE102006031659A1 (en) * | 2006-07-08 | 2008-01-10 | Man Nutzfahrzeuge Aktiengesellschaft | Arrangement for reducing nitrogen oxides in exhaust gases |
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| WO2013095214A1 (en) * | 2011-12-23 | 2013-06-27 | Volvo Lastvagnar Ab | Exhaust aftertreatment system and method for operating the system |
| DE102014112862A1 (en) * | 2014-09-08 | 2016-03-10 | Continental Automotive Gmbh | Particulate filter and method for producing a particulate filter |
| CN210410158U (en) * | 2018-12-25 | 2020-04-28 | 山东格润内泽姆环保科技有限公司 | Two-stage series SCR integrated device |
| CN112360598B (en) * | 2020-11-16 | 2022-04-05 | 潍柴动力股份有限公司 | double-SCR system, post-treatment system and engine |
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| DE102006031659A1 (en) * | 2006-07-08 | 2008-01-10 | Man Nutzfahrzeuge Aktiengesellschaft | Arrangement for reducing nitrogen oxides in exhaust gases |
| WO2019075877A1 (en) * | 2017-10-18 | 2019-04-25 | 潍柴动力股份有限公司 | Generalized integrated doc-dpf-scr after-treatment apparatus |
| CN109339912A (en) * | 2018-10-22 | 2019-02-15 | 北京工业大学 | A method and device suitable for nitrogen oxide control of high-power diesel engine |
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