CN106837480A - 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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Publication number
CN106837480A
CN106837480A CN201611220483.1A CN201611220483A CN106837480A CN 106837480 A CN106837480 A CN 106837480A CN 201611220483 A CN201611220483 A CN 201611220483A CN 106837480 A CN106837480 A CN 106837480A
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scrf
ammonia
stored value
concentration
steps
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CN106837480B (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 present invention relates to a kind of urea injecting quantity control method based on model, methods described comprises the following steps：S1：According to actual urea injecting quantity, the first ammonia Stored Value in SCRF is calculated based on SCRF models；S2：The second ammonia Stored Value in SCR is calculated based on SCR models；S3：The the first ammonia Stored Value and the second ammonia Stored Value that S1 steps and S2 steps are obtained are weighted treatment and obtain actual ammonia Stored Value；S4：S3 steps are obtained into actual ammonia Stored Value to be made the difference with ammonia storage setting value, and by PID controller, obtains the ammonia nitrogen ratio of Closed-cycle correction；S5：By S4 steps obtain Closed-cycle correction ammonia nitrogen ratio with feedforward ammonia nitrogen ratio do and, be eventually converted into the urea injecting quantity of demand.The present invention can realize the precise control to urea injection using model Closed-loop Control Strategy is based on, and can not only meet engine emission requirements, and can reduce 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, more particularly to gas discharge field of purification.
Background technology
With increasingly strict, band SCR (the Selective Catalyst Reduction, selectivity of automobile emission regulation Catalytic reduction reaction) after-treatment system turn into reduce exhaust emission mainstream technology.After-treatment system reduction discharge with SCR The method of pollution is, by urea is sprayed in SCR casees, reaching the purpose of reduction nitrogen oxides, so as to reduce discharge, to meet row Put the requirement of regulation.
On the basis of SCR, SCRF technologies are further developed, SCRF refers to and for SCR catalyst to be coated in DPF (particulate matters Trap) on, also known as SCR on Filter, SDPF etc..Using SCRF technologies, it is not only able to lower post processing volume, Er Qieqi Combustion characteristic is more excellent, it is possible to increase SCR conversion efficiency.SCRF technologies equally face the demand of urea injecting quantity precise control.
In the prior art, the method for control urea injecting quantity is that demarcation is separately controlled using SCR and DPF, in this case, NH in SCR3With DPF passive regenerations exist it is public and compete consumption NO2Situation.Therefore prior art is adapted in SCRF systems Property is poor, and stated accuracy is difficult to meet demand.
The content of the invention
The present invention proposes that, using model Closed-loop Control Strategy is based on, the precise control to urea injection can be realized, not only can Meet engine emission requirements, and staking-out work can be reduced and crystallisation problems are solved.
An object of the present invention is achieved through the following technical solutions.
A kind of urea injecting quantity control method based on model, methods described comprises the following steps：
S1：Actual urea injecting quantity is input into SCRF models, and the first ammonia Stored Value in SCRF is calculated based on SCRF models；
S2：The second ammonia Stored Value in SCR is calculated based on SCR models；
S3：The the first ammonia Stored Value and the second ammonia Stored Value that S1 steps and S2 steps are obtained are weighted treatment and obtain actual ammonia Stored Value；
S4：S3 steps are obtained into actual ammonia Stored Value to be made the difference with ammonia storage setting value, and by PID controller, is obtained closed loop and is repaiied Positive ammonia nitrogen ratio；
S5：By S4 steps obtain Closed-cycle correction ammonia nitrogen ratio with feedforward ammonia nitrogen ratio do and, be eventually converted into the urine of demand Plain emitted dose.
Further, in S1 steps, the input of the SCRF models also includes NH3 concentration, O2Concentration, NO concentration, NO2Concentration, Temperature before SCRF, extraction flow and carbon original discharge capacity；The SCRF models are specially and for SCRF to be radially divided into multiple unit moulds Block, carbon carrying capacity, ammonia storage, NO, NO are calculated in each unit module respectively according to energy conservation equation and mass-conservation equation2With NH3；Ammonia storage addition to each unit obtains the first ammonia Stored Value.
Further, in S2 steps, the input of the SCR models includes NH3Concentration, O2Concentration, NO concentration, NO2Concentration and Gas temperature before SCR；The SCR models are specially the unit module that SCR is radially divided into certain data, to each unit mould Block applied energy conservation equation and mass-conservation equation, so as to calculate ammonia storage, NO, NO of each unit module2、NH3And temperature Degree, the ammonia storage addition to each unit module obtains the second ammonia Stored Value.
Further, in S3 steps, looking into MAP acquisition weight coefficients according to rotating speed and distributive value carries out the weighting treatment.
Further, the weighting treatment actual ammonia Stored Value of acquisition is：The first ammonia Stored Value and weight coefficient are done into product first, is obtained The first ammonia Stored Value after must weighting；Then, made the difference with numerical value 2 and weight coefficient, difference and the second ammonia Stored Value are done into product, added The second ammonia Stored Value after power；Finally, the first ammonia Stored Value and the second ammonia Stored Value are done and, obtain actual ammonia Stored Value.
Further, by demarcating the NO of DOC2Transformation efficiency (is for example demarcated) according to rotating speed and distributive value, is obtained NO2Proportion MAP, then looks into the MAP and obtains NO by rotating speed and distributive value2Proportion, by NO in the former row of enginex Concentration and the NO2Proportion is the NO that product obtains the input SCRF models2Concentration, then by original row in NOxConcentration and NO2 Concentration makes the difference the NO concentration for obtaining the input SCRF models.
Further, temperature before SCRF is obtained according to temperature sensor；According to actual urea injecting quantity (for example 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 is measured Obtain.
Further, by NH in SCRF3Absorption and NH3The chemical reaction rate of desorption is set to that variable can be demarcated, and the variable leads to Summary test data is crossed to be demarcated.
Further, the feedforward ammonia nitrogen ratio in the ammonia storage setting value and S5 steps in the S4 steps, is According to SCRF temperature and air speed, the corresponding MAP demarcated in advance by inquiry is determined.
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 systems, the SCRF that are sequentially arranged System, SCR system and ASC systems, upstream NO is disposed with before the DOC systemsxSensor and DOC upstream temperature sensors, Urea nozzle and SCRF upstream temperature sensors are disposed between DOC systems and SCRF systems；SCRF systems and SCR system it Between be disposed with SCR upstream temperature sensors, and downstream NO is there also is provided after ASCxSensor and SCR downstream temperatures are sensed Device, the post processing control system is controlled using the above-mentioned urea injecting quantity control method based on model to urea injecting quantity System.
The advantage of the invention is that：
The present invention is based on SCRF hardware systems, extracts the Closed-loop Control Strategy based on double ammonia storages, realizes spraying urea Precise control, not only can guarantee that discharge meets demand, and System design based on model strong adaptability, demarcate simple, only need to be from Line is demarcated, and highly versatile is conducive to commercialization.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 shows the After-treatment technics control system part layout drawing according to embodiment of the present invention.
Fig. 2 shows the urea injecting quantity control method urea injection control logic chart 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 accompanying 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.Conversely, there is provided these implementation methods are able to be best understood from the disclosure, and can be by this public affairs The scope opened it is complete convey to those skilled in the art.
According to the embodiment of the present invention, locate after proposing a kind of urea injecting quantity control method and engine based on model Reason control system, with reference to Fig. 1, the post processing control system include be sequentially arranged DOC systems, SCRF systems, SCR system and ASC systems, upstream NO is disposed with before the DOC systemsxSensor and DOC upstream temperature sensors, in DOC systems and SCRF systems Urea nozzle and SCRF upstream temperature sensors are disposed between system；SCR upstreams are disposed between SCRF systems and SCR system Temperature sensor, and downstream NO is there also is provided after ASCxSensor and SCR downstream temperature sensors.
With reference to Fig. 2, based on above-mentioned arrangement, embodiments of the present invention realize a kind of urea injecting quantity based on model Control method, methods described comprises the following steps：
S1：Actual urea injecting quantity is input into SCRF models, and the first ammonia Stored Value in SCRF is calculated based on SCRF models θ1；
S2：The second ammonia Stored Value θ in SCR is calculated based on SCR models2；
S3：The first ammonia Stored Value θ that S1 steps and S2 steps are obtained1With the second ammonia Stored Value θ2It is weighted treatment and obtains real Border ammonia Stored Value θ；
S4：S3 steps are obtained into actual ammonia Stored Value to be made the difference with ammonia storage setting value, and by PID controller, is obtained closed loop and is repaiied Positive ammonia nitrogen ratio；
S5：By S4 steps obtain Closed-cycle correction ammonia nitrogen ratio with feedforward ammonia nitrogen ratio do and, be eventually converted into the urine of demand Plain emitted dose.
In the above-mentioned methods：
For S1 steps, the input of the SCRF models also includes NH3 concentration, O2Concentration, NO concentration, NO2Concentration, SCRF Preceding temperature, extraction flow and carbon original discharge capacity；The SCRF models are specially and for SCRF to be radially divided into multiple unit modules, Carbon carrying capacity, ammonia storage, NO, NO are calculated according to energy conservation equation and mass-conservation equation respectively in each unit module2And NH3；It is right The ammonia storage addition of each unit obtains the first ammonia Stored Value.Due in SCRF, I haven't seen you for ages produces certain influence to ammonia storage for carbon distribution many, Therefore need NH in SCRF3Absorption and NH3The chemical reaction rate of desorption is set to that variable can be demarcated, and the variable needs to pass through Test data is summarized to be demarcated.Wherein, by demarcating the NO of DOC2Transformation efficiency, obtains NO2Proportion MAP, then passes through Rotating speed and distributive value look into the MAP and obtain NO2Proportion, by NOx concentration and the NO in the former row of engine2Proportion is done Product obtains the NO of the input SCRF models2Concentration, then by original row in NOxConcentration and NO2Concentration makes the difference the acquisition input SCRF The NO concentration of model.Temperature before SCRF is obtained according to temperature sensor；According to actual 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 is obtained.
For S2 steps, the input of the SCR models includes NH3Concentration, O2Concentration, NO concentration, NO2Gas before concentration and SCR Temperature；The SCR models are specially the unit module that SCR is radially divided into certain data, to each unit module application Energy conservation equation and mass-conservation equation, so as to calculate ammonia storage, NO, NO of each unit module2、NH3And temperature, to every The ammonia storage addition of individual unit module obtains the second ammonia Stored Value.
For S3 steps, looking into MAP acquisition weight coefficients according to rotating speed and distributive value carries out the weighting treatment.Specially： The first ammonia Stored Value and weight coefficient are done into product first, the first ammonia Stored Value after being weighted；Then, with numerical value 2 and weight coefficient Make the difference, difference and the second ammonia Stored Value are done into product, the second ammonia Stored Value after being weighted；Finally, by the first ammonia Stored Value and the second ammonia Stored Value does and obtains actual ammonia Stored Value.
For in the S4 steps the ammonia storage setting value and S5 steps in the feedforward ammonia nitrogen ratio, according to SCRF temperature and air speed, the corresponding MAP demarcated in advance by inquiry are determined.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto, Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, Should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim Enclose and be defined.

Claims (10)

1. a kind of urea injecting quantity control method based on model, it is characterised in that methods described comprises the following steps：
S1：Actual urea injecting quantity is input into SCRF models, and the first ammonia Stored Value in SCRF is calculated based on SCRF models；
S2：The second ammonia Stored Value in SCR is calculated based on SCR models；
S3：The the first ammonia Stored Value and the second ammonia Stored Value that S1 steps and S2 steps are obtained are weighted treatment and obtain actual ammonia storage Value；
S4：S3 steps are obtained into actual ammonia Stored Value to be made the difference with ammonia storage setting value, and by PID controller, obtains Closed-cycle correction Ammonia nitrogen ratio；
S5：By S4 steps obtain Closed-cycle correction ammonia nitrogen ratio with feedforward ammonia nitrogen ratio do and, be eventually converted into demand urea spray The amount of penetrating.
2. the urea injecting quantity control method of model is based on as claimed in claim 1, it is characterised in that described in S1 steps The input of SCRF models also includes NH3 concentration, O2Concentration, NO concentration, NO2Concentration, temperature before SCRF, extraction flow and carbon are former Discharge capacity；The SCRF models are specially and for SCRF to be radially divided into multiple unit modules, according to energy in each unit module Conservation equation and mass-conservation equation calculate carbon carrying capacity, ammonia storage, NO, NO respectively2And NH3；Ammonia storage addition to each unit is obtained First ammonia Stored Value.
3. the urea injecting quantity control method of model is based on as claimed in claim 1, it is characterised in that described in S2 steps The input of SCR models includes NH3Concentration, O2Concentration, NO concentration, NO2Gas temperature before concentration and SCR；The SCR models are specific It is the unit module that SCR is radially divided into certain data, to each unit module applied energy conservation equation and the conservation of mass Equation, so as to calculate ammonia storage, NO, NO of each unit module2、NH3And temperature, the storage of the ammonia of each unit module is added To the second ammonia Stored Value.
4. the urea injecting quantity control method of model is based on as claimed in claim 1, it is characterised in that in S3 steps, according to Rotating speed and distributive value look into MAP acquisition weight coefficients and carry out the weighting treatment.
5. the urea injecting quantity control method of model is based on as claimed in claim 4, it is characterised in that the weighting treatment is obtained Obtaining actual ammonia Stored Value is：The first ammonia Stored Value and weight coefficient are done into product first, the first ammonia Stored Value after being weighted；Then, use Numerical value 2 makes the difference with weight coefficient, difference and the second ammonia Stored Value is done into product, the second ammonia Stored Value after being weighted；Finally, by first Ammonia Stored Value and the second ammonia Stored Value do and, obtain actual ammonia Stored Value.
6. the urea injecting quantity control method of model is based on as claimed in claim 2, it is characterised in that by demarcating DOC's NO2Transformation efficiency, obtains NO2Proportion MAP, then looks into the MAP and obtains NO by rotating speed and distributive value2Proportion, will NO in the former row of enginexConcentration and the NO2Proportion is the NO that product obtains the input SCRF models2Concentration, then original is arranged Middle NOxConcentration and NO2Concentration makes the difference the NO concentration for obtaining the input SCRF models.
7. the urea injecting quantity control method of model is based on as claimed in claim 2, it is characterised in that obtained according to temperature sensor Temperature before to SCRF；NH before SCRF is obtained according to actual urea injecting quantity3Concentration；It is vented according to air inflow and distributive value Flow；O2Concentration is by NOxSensor measurement is obtained.
8. the urea injecting quantity control method of model is based on as claimed in claim 2, it is characterised in that by NH in SCRF3Absorption And NH3The chemical reaction rate of desorption is set to that variable can be demarcated, and the variable is demarcated by summarizing test data.
9. the urea injecting quantity control method based on model as described in claim 1-8 any one, it is characterised in that described In S4 steps the ammonia storage setting value and S5 steps in the feedforward ammonia nitrogen ratio, be according to SCRF temperature and air speed, The corresponding MAP demarcated in advance by inquiry is determined.
10. a kind of After-treatment technics control system, the post processing control system includes the DOC systems, the SCRF that are sequentially arranged System, SCR system and ASC systems, upstream NO is disposed with before the DOC systemsxSensor and DOC upstream temperature sensors, Urea nozzle and SCRF upstream temperature sensors are disposed between DOC systems and SCRF systems；SCRF systems and SCR system it Between be disposed with SCR upstream temperature sensors, and downstream NO is there also is provided after ASCxSensor and SCR downstream temperatures are sensed Device, the post processing control system is using the control of the urea injecting quantity based on model as described in claim 1-9 any one Method is controlled to urea injecting quantity.
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