CN106837480B - A kind of urea injecting quantity control method and post-processing control system based on model - Google Patents

A kind of urea injecting quantity control method and post-processing control system based on model Download PDF

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CN106837480B
CN106837480B CN201611220483.1A CN201611220483A CN106837480B CN 106837480 B CN106837480 B CN 106837480B CN 201611220483 A CN201611220483 A CN 201611220483A CN 106837480 B CN106837480 B CN 106837480B
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model
scrf
ammonia
stored value
concentration
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CN106837480A (en
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张军
张振涛
王晓华
曹庆和
张瑜
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N3/033—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 in combination with other devices
    • F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • 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
    • F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0408—Methods of control or diagnosing using a feed-back loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0411—Methods of control or diagnosing using a feed-forward control
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The urea injecting quantity control method based on model that the present invention relates to a kind of, described method includes following steps: S1: according to practical urea injecting quantity, calculating the first ammonia Stored Value in SCRF based on SCRF model；S2: the second ammonia Stored Value in SCR is calculated based on SCR model；S3: the first ammonia Stored Value and the second ammonia Stored Value of S1 step and the acquisition of S2 step are weighted processing and obtain practical ammonia Stored Value；S4: S3 step is obtained into practical ammonia Stored Value and is made the difference with ammonia storage setting value, and passes through PID controller, obtains the ammonia nitrogen ratio of Closed-cycle correction；S5: by the ammonia nitrogen ratio for the Closed-cycle correction that S4 step obtains and feedforward ammonia nitrogen ratio do and, be eventually converted into the urea injecting quantity of demand.The present invention, which uses, is based on model Closed-loop Control Strategy, is able to achieve the accurate control to urea injection, is not only able to satisfy engine emission requirements, and can be reduced staking-out work and solve crystallisation problems.

Description

A kind of urea injecting quantity control method and post-processing control system based on model
Technical field
The present invention relates to engine art, in particular to gas discharges field of purification.
Background technique
With increasingly stringent, band SCR (Selective Catalyst Reduction, the selectivity of automobile emission regulation Catalytic reduction reaction) after-treatment system become reduce exhaust emission mainstream technology.After-treatment system with SCR reduces discharge The method of pollution is achieved the purpose that reduce nitrogen oxides, to reduce discharge, meets row by spraying urea into SCR case Put the requirement of regulation.
On the basis of SCR, SCRF technology is further developed, SCRF, which refers to, is coated in DPF (particulate matter for SCR catalyst Trap) on, also known as SCR on Filter, SDPF etc..Using SCRF technology, it is not only able to lower post-processing volume, Er Qieqi It is more excellent to fire characteristic, can be improved SCR conversion efficiency.SCRF technology equally faces the demand that urea injecting quantity accurately controls.
In the prior art, the method for controlling urea injecting quantity is that calibration is separately controlled using SCR and DPF, in this case, NH in SCR3With DPF passive regeneration there are it is public and compete consumption NO2The case where.Therefore the prior art adapts in SCRF system Property is poor, and stated accuracy is difficult to meet demand.
Summary of the invention
The present invention proposes to be able to achieve the accurate control to urea injection using model Closed-loop Control Strategy is based on, not only can Meet engine emission requirements, and can be reduced staking-out work and solve crystallisation problems.
An object of the present invention is achieved through the following technical solutions.
A kind of urea injecting quantity control method based on model, described method includes following steps:
S1: practical urea injecting quantity is inputted into SCRF model, and the first ammonia Stored Value in SCRF is calculated based on SCRF model；
S2: the second ammonia Stored Value in SCR is calculated based on SCR model；
S3: the first ammonia Stored Value and the second ammonia Stored Value of S1 step and the acquisition of S2 step are weighted processing and obtain practical ammonia Stored Value；
S4: S3 step is obtained into practical ammonia Stored Value and is made the difference with ammonia storage setting value, and passes through PID controller, closed loop is obtained and repairs Positive ammonia nitrogen ratio；
S5: by the ammonia nitrogen ratio for the Closed-cycle correction that S4 step obtains and feedforward ammonia nitrogen ratio do and, be eventually converted into the urine of demand Plain the amount of injection.
Further, in S1 step, the input of the SCRF model further includes NH3 concentration, O2Concentration, NO concentration, NO2Concentration, Temperature before SCRF, extraction flow and carbon original discharge capacity；The SCRF model is specially that SCRF is radially divided into multiple unit moulds Block calculates separately carbon carrying capacity, ammonia storage, NO, NO according to energy conservation equation and mass-conservation equation in each unit module2With NH3；The ammonia storage of each unit is added and obtains the first ammonia Stored Value.
Further, in S2 step, the input of the SCR model includes NH3Concentration, O2Concentration, NO concentration, NO2Concentration and Gas temperature before SCR；The SCR model is specially that SCR is radially divided into multiple unit modules, to each unit module application Energy conservation equation and mass-conservation equation, to calculate the ammonia storage of each unit module, NO, NO2、NH3And temperature, to every The ammonia storage of a unit module, which is added, obtains the second ammonia Stored Value.
Further, in S3 step, MAP is looked into according to revolving speed and distributive value and obtains the weighting coefficient progress weighting processing.
Further, the weighting processing obtains practical ammonia Stored Value are as follows: the first ammonia Stored Value and weighting coefficient are done product first, obtained The first ammonia Stored Value after must weighting；Then, it is made the difference with numerical value 2 with weighting coefficient, difference and the second ammonia Stored Value is done into product, added The second ammonia Stored Value after power；Finally, by after weighting the first ammonia Stored Value and weighting after the second ammonia Stored Value do and, obtain practical ammonia Stored Value.
Further, pass through the NO of calibration DOC2Transformation efficiency (such as being demarcated according to revolving speed and distributive value) obtains NO2Then proportion MAP looks into the MAP by revolving speed and distributive value and obtains NO2Proportion, by NO in engine original rowx Concentration and the NO2Proportion does product and obtains the NO for inputting the SCRF model2Concentration, then by original row in NOxConcentration and NO2 Concentration makes the difference the NO concentration for obtaining and inputting the SCRF model.
Further, temperature before SCRF is obtained according to temperature sensor；According to practical urea injecting quantity (such as by its divided by 5.429) NH before SCRF is obtained3Concentration；Extraction flow is obtained according to air inflow and distributive value；O2Concentration is by NOxSensor measurement It obtains.
Further, by NH in SCRF3Absorption and NH3The chemical reaction rate of desorption is set as calibrable variable, and the variable is logical Summary test data is crossed to be demarcated.
Further, the ammonia storage setting value in the S4 step and the feedforward ammonia nitrogen ratio in S5 step are According to SCRF temperature and air speed, it is determined by inquiring the corresponding MAP demarcated in advance.
Another object of the present invention provides a kind of After-treatment technics control system, can be real by following technical solution It is existing.
A kind of After-treatment technics control system, the post-processing control system includes the DOC system being sequentially arranged, SCRF System, SCR system and ASC system are disposed with upstream NO before the DOC systemxSensor and DOC upstream temperature sensor, Urea nozzle and SCRF upstream temperature sensor are disposed between DOC system and SCRF system；SCRF system and SCR system it Between be disposed with SCR upstream temperature sensor, and there also is provided downstream NO after ASCxSensor and SCR downstream temperature sensing Device, the post-processing control system control urea injecting quantity using the above-mentioned urea injecting quantity control method based on model System.
The present invention has the advantages that
The present invention is based on SCRF hardware system, the Closed-loop Control Strategy based on the storage of double ammonia is extracted, realizes and urea is sprayed Accurate control, not only can guarantee discharge meet demand, and System design based on model is adaptable, calibration is simple, only need to be from Line calibration, it is versatile, be conducive to commercialization.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 shows the After-treatment technics control system component layout figure of embodiment according to the present invention.
Fig. 2 shows the urea injecting quantity control method urea injection control logic charts based on model.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawing The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here The mode of applying is limited.It is to be able to thoroughly understand the disclosure on the contrary, providing these embodiments, and can be by this public affairs The range opened is fully disclosed to those skilled in the art.
Embodiment according to the present invention, after proposing a kind of urea injecting quantity control method based on model and engine Manage control system, with reference to Fig. 1, the post-processing control system include the DOC system being sequentially arranged, SCRF system, SCR system and ASC system is disposed with upstream NO before the DOC systemxSensor and DOC upstream temperature sensor, in DOC system and SCRF system Urea nozzle and SCRF upstream temperature sensor are disposed between system；The upstream SCR is disposed between SCRF system and SCR system Temperature sensor, and there also is provided downstream NO after ASCxSensor and SCR downstream temperature sensor.
With reference to Fig. 2, it is based on above-mentioned arrangement, embodiments of the present invention realize a kind of urea injecting quantity based on model Control method, described method includes following steps:
S1: practical urea injecting quantity is inputted into SCRF model, and the first ammonia Stored Value in SCRF is calculated based on SCRF model θ1；
S2: the second ammonia Stored Value θ in SCR is calculated based on SCR model2；
S3: the first ammonia Stored Value θ that S1 step and S2 step are obtained1With the second ammonia Stored Value θ2Processing is weighted to obtain in fact Border ammonia Stored Value θ；
S4: S3 step is obtained into practical ammonia Stored Value and is made the difference with ammonia storage setting value, and passes through PID controller, closed loop is obtained and repairs Positive ammonia nitrogen ratio；
S5: by the ammonia nitrogen ratio for the Closed-cycle correction that S4 step obtains and feedforward ammonia nitrogen ratio do and, be eventually converted into the urine of demand Plain the amount of injection.
In the above-mentioned methods:
For S1 step, the input of the SCRF model further includes NH3 concentration, O2Concentration, NO concentration, NO2Concentration, SCRF Preceding temperature, extraction flow and carbon original discharge capacity；The SCRF model is specially that SCRF is radially divided into multiple unit modules, Carbon carrying capacity, ammonia storage, NO, NO are calculated separately according to energy conservation equation and mass-conservation equation in each unit module2And NH3；It is right The ammonia storage of each unit, which is added, obtains the first ammonia Stored Value.Due in SCRF, carbon distribution number ammonia can be stored up and generate certain influence, Therefore it needs NH in SCRF3Absorption and NH3The chemical reaction rate of desorption is set as calibrable variable, and variable needs pass through Test data is summarized to be demarcated.Wherein, pass through the NO of calibration DOC2Transformation efficiency obtains NO2Proportion MAP, then passes through Revolving speed and distributive value look into the MAP and obtain NO2Proportion, by NOx concentration and the NO in engine original row2Proportion is done Product obtains the NO for inputting the SCRF model2Concentration, then by original row in NOxConcentration and NO2Concentration makes the difference acquisition and inputs the SCRF The NO concentration of model.Temperature before SCRF is obtained according to temperature sensor；According to practical urea injecting quantity, by it divided by numerical value 5.429, Obtain NH before SCRF3Concentration；Extraction flow is obtained according to air inflow and distributive value；O2Concentration is by NOxSensor measurement obtains.
For S2 step, the input of the SCR model includes NH3Concentration, O2Concentration, NO concentration, NO2Gas before concentration and SCR Temperature；The SCR model is specially that SCR is radially divided into multiple unit modules, is kept each unit module applied energy Permanent equation and mass-conservation equation, to calculate the ammonia storage of each unit module, NO, NO2、NH3And temperature, to each unit The ammonia storage of module, which is added, obtains the second ammonia Stored Value.
For S3 step, MAP is looked into according to revolving speed and distributive value and obtains the weighting coefficient progress weighting processing.Specifically: The first ammonia Stored Value and weighting coefficient are done into product first, the first ammonia Stored Value after being weighted；Then, with numerical value 2 and weighting coefficient It makes the difference, difference and the second ammonia Stored Value is done into product, the second ammonia Stored Value after being weighted；Finally, by the first ammonia Stored Value after weighting Done with the second ammonia Stored Value after weighting and, obtain practical ammonia Stored Value.
For the ammonia storage setting value in the S4 step and the feedforward ammonia nitrogen ratio in S5 step, according to equal SCRF temperature and air speed are determined by inquiring the corresponding MAP demarcated in advance.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art, It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim Subject to enclosing.

Claims (10)

1. a kind of urea injecting quantity control method based on model, which is characterized in that described method includes following steps:
S1: practical urea injecting quantity is inputted into SCRF model, and the first ammonia Stored Value in SCRF is calculated based on SCRF model；
S2: the second ammonia Stored Value in SCR is calculated based on SCR model；
S3: the first ammonia Stored Value and the second ammonia Stored Value of S1 step and the acquisition of S2 step are weighted processing and obtain practical ammonia storage Value；
S4: S3 step is obtained into practical ammonia Stored Value and is made the difference with ammonia storage setting value, and passes through PID controller, obtains Closed-cycle correction Ammonia nitrogen ratio；
S5: by the ammonia nitrogen ratio for the Closed-cycle correction that S4 step obtains and feedforward ammonia nitrogen ratio do and, be eventually converted into demand urea spray The amount of penetrating.
2. the urea injecting quantity control method based on model as described in claim 1, which is characterized in that described in S1 step The input of SCRF model further includes NH3 concentration, O2Concentration, NO concentration, NO2Concentration, temperature before SCRF, extraction flow and carbon are former Discharge capacity；The SCRF model is specially that SCRF is radially divided into multiple unit modules, according to energy in each unit module Conservation equation and mass-conservation equation calculate separately carbon carrying capacity, ammonia storage, NO, NO2And NH3；The ammonia storage of each unit is added and is obtained First ammonia Stored Value.
3. the urea injecting quantity control method based on model as described in claim 1, which is characterized in that described in S2 step The input of SCR model includes NH3Concentration, O2Concentration, NO concentration, NO2Gas temperature before concentration and SCR；The SCR model is specific For SCR to be radially divided into multiple unit modules, to each unit module applied energy conservation equation and mass-conservation equation, from And calculate the ammonia storage of each unit module, NO, NO2、NH3And temperature, the ammonia storage of each unit module is added and obtains the second ammonia Stored Value.
4. the urea injecting quantity control method based on model as described in claim 1, which is characterized in that in S3 step, according to Revolving speed and distributive value look into MAP and obtain the weighting coefficient progress weighting processing.
5. the urea injecting quantity control method based on model as claimed in claim 4, which is characterized in that the weighting processing obtains Obtain practical ammonia Stored Value are as follows: the first ammonia Stored Value and weighting coefficient are done into product first, the first ammonia Stored Value after being weighted；Then, it uses Numerical value 2 makes the difference with weighting coefficient, difference and the second ammonia Stored Value is done product, the second ammonia Stored Value after being weighted；Finally, will weighting The second ammonia Stored Value after rear the first ammonia Stored Value and weighting do and, obtain practical ammonia Stored Value.
6. the urea injecting quantity control method based on model as claimed in claim 2, which is characterized in that pass through calibration DOC's NO2Transformation efficiency obtains NO2Then proportion MAP looks into the MAP by revolving speed and distributive value and obtains NO2Proportion, will NO in engine original rowxConcentration and the NO2Proportion does product and obtains the NO for inputting the SCRF model2Concentration, then original is arranged Middle NOxConcentration and NO2Concentration makes the difference the NO concentration for obtaining and inputting the SCRF model.
7. the urea injecting quantity control method based on model as claimed in claim 2, which is characterized in that according to temperature sensor Obtain temperature before SCRF；NH before SCRF is obtained according to practical urea injecting quantity3Concentration；It is arranged according to air inflow and distributive value Throughput；O2Concentration is by NOxSensor measurement obtains.
8. the urea injecting quantity control method based on model as claimed in claim 2, which is characterized in that by NH in SCRF3Absorption And NH3The chemical reaction rate of desorption is set as calibrable variable, which is demarcated by summarizing test data.
9. the urea injecting quantity control method based on model as described in claim 1-8 any one, which is characterized in that described Ammonia storage setting value in S4 step and the feedforward ammonia nitrogen ratio in S5 step, for according to SCRF temperature and air speed, It is determined by inquiring the corresponding MAP demarcated in advance.
10. a kind of After-treatment technics control system, the post-processing control system includes the DOC system being sequentially arranged, SCRF System, SCR system and ASC system are disposed with upstream NO before the DOC systemxSensor and DOC upstream temperature sensor, Urea nozzle and SCRF upstream temperature sensor are disposed between DOC system and SCRF system；SCRF system and SCR system it Between be disposed with SCR upstream temperature sensor, and there also is provided downstream NO after ASCxSensor and SCR downstream temperature sensing Device, the post-processing control system is using the urea injecting quantity control as described in any one of claims 1-9 based on model Method controls urea injecting quantity.
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