CN103362620B - For controlling the system and method with the gas extraction system of SCR parts - Google Patents

For controlling the system and method with the gas extraction system of SCR parts Download PDF

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Publication number
CN103362620B
CN103362620B CN201310289005.6A CN201310289005A CN103362620B CN 103362620 B CN103362620 B CN 103362620B CN 201310289005 A CN201310289005 A CN 201310289005A CN 103362620 B CN103362620 B CN 103362620B
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China
Prior art keywords
scr
exhaust stream
component
ageing time
sensing
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CN103362620A (en
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M·孙
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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Classifications

    • 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]
    • 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
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/02—Catalytic activity of catalytic converters
    • 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
    • F01N2560/021—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting ammonia NH3
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0412—Methods of control or diagnosing using pre-calibrated maps, tables or charts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1402—Exhaust gas composition
    • 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
    • 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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • 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
    • 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)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

A kind of method for controlling SCR component operation, including: receive the signal of the sensing situation reflecting the exhaust stream relevant to SCR component；Sensing situation based on exhaust stream, estimates the apparent ageing time of SCR component；And, based on the apparent ageing time of SCR, the operating condition of SCR component is set.

Description

For controlling the system and method with the gas extraction system of SCR parts
Technical field
Subject of the present invention relates to vehicle exhaust system, more particularly, it relates to comprise choosing for control The system and method for the gas extraction system of selecting property catalysis reduction (SCR) parts.
Background technology
The purpose that background mentioned herein describes is the background information presenting the present invention generally.Invention People a part work be described in the background section, this partial content and submit to application time The most separately constituting the aspect of prior art in this description, the most indefinite not being recognized as with also implying that destroys this The prior art of invention..
In the combustion process of Diesel engine, by intake valve, air/fuel mixture is inputted vapour Cylinder, and compress wherein and burn.After burning, the exhaust in cylinder is pushed gas extraction system by piston. Exhaust may comprise nitrogen oxides (NOx) and carbon monoxide (CO).
Exhaust-gas treatment system can use the catalyst of one or more components, and it is configured for realizing SCR process, such as nitrogen oxides reduction (NOx) are to produce by nitrogen (N2) and water (H2O) structure The more permissible discharge composition become.Reducing agent can be added in the exhaust of SCR component upstream, Being only used as example, reducing agent can include anhydrous ammonia (NH3), ammoniacal liquor or urea, any or all these All can spray in exhaust as mist.When the ammonia mixed with exhaust arrives SCR component, NOx emission Decompose.Then, diesel particulate filter (DPF) can trap flue dust, and flue dust can follow in regeneration Ring is periodically burned.Steam, nitrogen and reduction discharge are then discharged out gas extraction system.
In order to maintain effective NOx reduction in SCR component, a controlling organization can be used to maintain Reduction dosage (that is, reducing agent loadings) required in SCR component.When the exhaust containing NOx is passed through During SCR component, reducing agent will be consumed, and exhaust described loadings.This controlling organization can use mould Type follows the tracks of and/or predicts that how many reducing agents are loaded in SCR component, and maintains suitable reduction Agent loadings is to realize desired effect, such as to the reduction of NOx in exhaust stream.Also can be by this Model determines the aging of SCR component, in order to periodic maintenance, or change is to engine and SCR The target controlling to select with realization of system.It is right that correct assessment SCR component aging can aid in The favourable control of SCR component, thus realize desired SCR efficiency, and be conducive at engine Balance between operability, power output, fuel consumption and the discharge of nitrogen oxides, thus obtain The performance improved and/or the urea consumption of fuel economy and minimizing.
Unfortunately, determine that vehicle-mounted SCR parts aging is probably costliness and insecure.Example As, it is relevant with engine with sense from SCR component upstream that conventional method can rely on SCR rate of ageing Parameter between correlation.But, SCR is aging actually may be with the substrate temperature in SCR component Other conditions within degree and SCR component are more closely related, and these conditions are probably and are difficult to properly Precision determine.Therefore, can according to the aging method with the correlation of the engine parameter that can sense Can be expensive, it may be necessary to develop correlation data for a long time, to be fully characterized as impact by aging The function of aging numerous parameters, without considering all of obvious variable, then this aging side Method is probably inaccurate.
Accordingly, it is desirable to provide a kind of system and method, to predict vehicle-mounted SCR ageing time, and disobey Rely in the engine parameter sensed and the correlation of high cost.It is also desirable that have a kind of improvement is System and method, for controlling the gas extraction system containing SCR component, wherein it is possible to based on directly by SCR One or more parameters of operation of components impact determine the aging of SCR component.
Summary of the invention
In one exemplary embodiment of the present invention, a kind of side for controlling SCR component operation Method, comprising: receive the signal of the sensing situation reflecting the exhaust stream relevant to SCR component；Base In the sensing situation of exhaust stream, estimate the apparent ageing time of SCR component；And, based on SCR portion The apparent ageing time of part, sets the operating condition of SCR component.
In another exemplary embodiment of the present invention, a kind of for control SCR component operation be System, comprising: SCR (SCR) ponent design module, it is disposed for receiving Reflect the signal of the sensing situation of the exhaust stream relevant to SCR component, and for based on exhaust stream Sensing situation estimate the apparent ageing time of SCR component.One is used for controlling SCR component operation System also include SCR component manage module, it is configured to apparent ageing time based on SCR component It is selectively adjusted the operating condition of SCR component.
Present invention also offers solution below:
1. for the method controlling SCR component operation, comprising:
Receive the signal of the sensing situation reflecting the exhaust stream relevant to described SCR component；
Sensing situation based on described exhaust stream, estimates the apparent ageing time of described SCR component；
Apparent ageing time based on described SCR component, sets the operating condition of described SCR component.
2. according to the method described in scheme 1, wherein, described reception reflects and described SCR component phase The signal of the sensing situation of the exhaust stream closed includes: receive the NOx of the sensing reflecting described exhaust stream The signal of content.
3. according to the method described in scheme 1, wherein, described reception reflects and described SCR component phase The signal of the sensing situation of the exhaust stream closed includes: receive the NH of the sensing reflecting described exhaust stream3 The signal of content.
4. according to the method described in scheme 1, wherein, described reception reflects and described SCR component phase The signal of the situation of the exhaust stream closed includes: reception reflects the exhaust stream in described SCR component downstream The signal of sensing situation.
5. according to the method described in scheme 1, wherein, the apparent ageing time of described estimation SCR component Including:
Mode input SCR ageing time is set；
Perform SCR reaction model, including:
Based on described mode input SCR ageing time, determine the SCR reaction efficiency of prediction；And
SCR reaction efficiency based on described prediction, determines the predicted conditions of described exhaust stream；
Adjust described mode input SCR ageing time and perform described SCR reaction model subsequently, directly In the predetermined tolerance of the sensing situation being in described exhaust stream to the predicted conditions of described exhaust stream；And
In the predetermined tolerance of the sensing situation being in described exhaust stream when the predetermined state of described exhaust stream Time, apparent SCR ageing time is set equal to described mode input SCR ageing time.
6. according to the method described in scheme 5, wherein, the sensing situation of described exhaust stream includes described row The NOx content of the sensing of air-flow.
7. according to the method described in scheme 5, wherein, the sensing situation of described exhaust stream includes described row The NH of the sensing of air-flow3Content.
8. according to the method described in scheme 5, wherein, the sensing situation of described exhaust stream is included in described The sensing situation in SCR component downstream.
9. according to the method described in scheme 5, wherein, the described SCR reaction efficiency bag determining prediction Include: the empirical data to one or more functions that SCR reaction efficiency is expressed as SCR ageing time Table carries out interpolation.
10. according to the method described in scheme 5, wherein, the described SCR reaction efficiency bag determining prediction Include: estimate the multinomial expression of one or more function that reaction efficiency is characterized as SCR ageing time Formula.
11. 1 kinds of systems being used for controlling SCR component operation, comprising:
SCR SCR component diagnostic module, it is configured to reception and reflects and described SCR The signal of the sensing situation of the exhaust stream that parts are relevant, and sensing situation based on described exhaust stream estimates Count the apparent ageing time of described SCR component；And
SCR component management module, it is configured to apparent ageing time based on described SCR component and selects Regulate to selecting property the operating condition of described SCR component.
12. according to the system described in scheme 11, and wherein, described SCR SCR component is examined Disconnected module is configured to: receive the signal of the NOx content of the sensing reflecting described exhaust stream.
13. according to the system described in scheme 11, and wherein, described SCR SCR component is examined Disconnected module is configured to: receive the NH of the sensing reflecting described exhaust stream3The signal of content.
14. according to the system described in scheme 11, and wherein, described SCR SCR component is examined Disconnected module is configured to: receive the letter of the sensing situation of the exhaust stream reflecting described SCR component downstream Number.
15. according to the system described in scheme 11, and wherein, described SCR SCR component is examined Disconnected module is configured that
Mode input SCR ageing time is set；
Perform SCR reaction model, including:
Based on described mode input SCR ageing time, determine the SCR reaction efficiency of prediction；
SCR reaction efficiency based on described prediction, determines the predicted conditions of described exhaust stream；
Adjust described mode input SCR ageing time and perform described SCR reaction model subsequently, directly In the predetermined tolerance of the sensing situation being in described exhaust stream to the predicted conditions of described exhaust stream；And
In the predetermined tolerance of the sensing situation being in described exhaust stream when the predicted conditions of described exhaust stream Time, apparent SCR ageing time is set equal to described mode input SCR ageing time.
16. according to the system described in scheme 15, and wherein, described SCR SCR component is examined Disconnected module is configured to: receive the signal of the NOx content of the sensing reflecting described exhaust stream.
17. according to the system described in scheme 15, and wherein, described SCR SCR component is examined Disconnected module is configured to: receive the NH of the sensing reflecting described exhaust stream3The signal of content.
18. according to the system described in scheme 15, and wherein, described SCR SCR component is examined Disconnected module is configured to: receive the letter of the sensing situation of the exhaust stream reflecting described SCR component downstream Number.
19. according to the system described in scheme 15, and wherein, described SCR SCR component is examined Disconnected module is configured to: to one or more functions that SCR reaction efficiency is expressed as SCR ageing time Empirical data table carry out interpolation.
20. according to the system described in scheme 15, and wherein, described SCR SCR component is examined Disconnected module is configured to: estimate one or more function that reaction efficiency is characterized as SCR ageing time Multi-term expression.
When combining relevant drawings and being discussed in more detail below the present invention, features described above and advantage and this Other bright feature and advantage are apparent from.
Accompanying drawing explanation
The most in an illustrative manner, below to the detailed description of embodiment presents further feature, advantage And details, describe in detail referring to the drawings, in accompanying drawing:
Fig. 1 is the functional block diagram including being vented the engine control system of diagnostic system, according to this Bright, described exhaust diagnostic system automatically predicts SCR ageing time；
Fig. 2 is the functional block of an exemplary embodiment of the control module of the exhaust diagnostic system of Fig. 1 Figure；And
Fig. 3 show according to the present invention, use poor quality diesel oil reducing agent quality operation after For the method resetting exhaust diagnostic system.
Detailed description of the invention
Explained below is merely exemplary in itself, it is therefore intended that limit this by any way Bright, its application or purposes.For clarity sake, use identical reference to indicate phase in the accompanying drawings As element.As used herein, phrase " at least one in A, B and C " should be construed to meaning Refer to employ the logic (A or B or C) of nonexcludability logical "or".It is to be understood that, method In step can be executed in different order, without change the present invention principle.
Term used herein " module " refers to: special IC (ASIC), electronic circuit, holds The processor (shared, special or groups of) of one or more softwares of row or firmware program and depositing Reservoir, combinational logic circuit, and/or the suitable components of other described function of offer.
Although disclosure below relates to Diesel engine, but other kinds of engine, such as gasoline Engine, including direct-injection engine, all can benefit from teaching herein.
According to one exemplary embodiment of the present invention, the invention provides a kind of system and method, use Predict SCR ageing time in vehicle-mounted, and do not rely on the engine parameter and/or SCR sensed Correlation between aging and engine related parameters.Present invention also offers system and the side of improvement Method, includes the gas extraction system of SCR (SCR) parts for control.The system improved The aging of SCR component can be determined in real time based on one or more onboard parameter with method, described Parameter is directly affected by the operation of SCR component, and (such as, the NOx of the exhaust stream in SCR component downstream contains Amount).
Foundation along with SCR ageing time, it is possible to precision and reliability to improve perform starting The control of the operation of machine system, including the control of the operation to SCR component.For example, it is possible to control to determine Amount supply, in order to suitable reducing agent loadings is provided in SCR catalyst.Equally, according to this Bright exhaust diagnostic system can use the management of invasive delivery temperature to improve delivery temperature so that SCR The temperature of catalyst is in a suitable level, with the desired operation of beneficially SCR component, or In some cases, it is allowed to the efficiency of test SCR catalyst.In certain circumstances, it may be necessary to hold The capable speed to vehicle and/or the control of other operating parameter.
Referring now to Fig. 1, that schematically shows diesel engine system 10.Diesel engine system System 10 includes Diesel engine 12 and exhaust-gas treatment system 13.Exhaust-gas treatment system 13 also includes exhaust System 14 and dosing system 16.Diesel engine 12 includes cylinder 18, inlet manifold 20, sky Gas mass flow (MAF) sensor 22 and engine speed sensor 24.Air stream passes through air inlet discrimination Pipe 20 flows into Diesel engine 12 and is monitored by maf sensor 22.Air is introduced into cylinder 18, and occur burning to drive piston (not shown) with fuel.Although illustrating single cylinder 18, it is to be understood that, Diesel engine 12 can include the cylinder 18 added.Such as, it is contemplated that It is that Diesel engine has 2,3,4,5,6,8,10,12 and 16 cylinders.
The result of combustion process can produce exhaust 19 in cylinder 18.Exhaust is being discharged into the atmosphere it Before, gas extraction system 14 processes this exhaust.Gas extraction system 14 includes that discharge manifold 26 and diesel oil oxidation are urged Agent (DOC) 28.Discharge manifold 26 guides exhaust leave cylinder and pass through DOC28.? DOC28 processes exhaust to reduce discharge.Gas extraction system 14 also includes SCR component 30, and DOC enters Mouthful temperature sensor 31, SRC inlet temperature sensor 32, SRC outlet temperature sensor 34 and Particulate filter (PF) 36.
DOC inlet temperature sensor 31 can be located between engine and DOC28.SRC inlet temperature Sensor 32 is positioned at the upstream of SCR component 30 to monitor the temperature of SCR component 30 porch.SRC Outlet temperature sensor 34 is positioned at the downstream of SCR component 30 to monitor the temperature in SCR component 30 exit Degree.Although the exhaust-gas treatment system 13 of diagram is illustrated as including being arranged in outside SCR component 30 SRC entrance and SRC outlet temperature sensor 32,34, but SRC entrance and SRC outlet temperature Sensor 32,34 may be located at inside SCR component 30 to monitor the entrance and exit of SCR component 30 The temperature of the exhaust 19 at place.PF36 be vented by trapping in 19 particle (that is, flue dust) further Reduce discharge.
Dosing system 16 includes weight feed injector 40, its in the future autoreduction agent supply source 38 Reducing agent be ejected into exhaust 19 in.Reducing agent mixes with exhaust, and when mixture is exposed to SCR During parts 30, further emission is reduced.Blender 41 can be used at SCR component 30 Reducing agent is mixed by upstream with exhaust.Control module 42 regulates and controls the behaviour of engine system 10 Make.
Exhaust flow rate sensor 44 can produce the signal corresponding with the flow being vented 19 in gas extraction system. Though it is shown that this sensor is between SCR component 30 and PF36, but other in gas extraction system Various positions can be used for this measurement, upper including the downstream of discharge manifold and SCR component 30 Trip.
Temperature sensor 46 produces the particulate filter temperature corresponding to the particulate filter temperature recorded. Temperature sensor 46 can be placed on PF36 or within.Temperature sensor 46 may be alternatively located at PF36 Upstream or downstream.
Other sensors in gas extraction system include upstream side NOx sensor 50, and it is based on gas extraction system Present in the concentration of NOx produce NOx signal.Downstream NOx sensor 52 can be positioned PF The downstream of 36, to measure the NOx concentration leaving PF36, or is placed in SCR component 30 times Trip, such as in the layout closely coupled.Additionally, ammonia (NH3) sensor 54 produce corresponding to row The signal of the amount of ammonia in gas.NH3Sensor 54 is optional, but distinguishes NOx and NH owing to having3 Ability it can also be used to simplified control system.Downstream NH3Sensor 54 can be located under PF36 Trip, to measure the NH leaving PF363Concentration, or it is placed in SCR component 30 downstream, such as exist In the layout closely coupled.Alternatively and/or additionally, hydrocarbon (HC) supply unit 56 and HC can be set Injector 58, to supply HC to the exhaust 19 arriving DOC catalyst.
As in figure 2 it is shown, control module 42 can include SCR component diagnostic module 60, it is used for determining NOx conversion efficiency at SCR component 30.Control module 42 also includes that SCR component manages module 62, its invasive ground controls temperature or other parameter of SCR component 30.An exemplary embodiment party In formula, SCR component diagnostic module 60 includes signal receiver 70 and SCR reaction simulation module 72. Signal receiver 70 is configured to receive the letter of the sensing situation reflecting the exhaust stream relevant to SCR component Number.SCR reaction simulation module 72 is configured to sensing situation based on exhaust stream and estimates the table of SCR component See ageing time (apparent aging time).In one exemplary embodiment, SCR component diagnosis The signal receiver 70 of module 60 receives one or more signal reflecting exhaust flow condition, such as The NOx content of the sensing of the exhaust stream in SCR component downstream and/or the NH of the sensing of exhaust stream3Content.
In one exemplary embodiment, the SCR reaction simulation module of SCR component diagnostic module 60 72 are configured to determine aging (such as, by recursive algorithm or iterative process) of SCR component.Example As, SCR reaction simulation module 72 can input SCR ageing time with setting model, and under passing through subsequently State and perform SCR reaction simulation model: be primarily based on mode input SCR ageing time to determine prediction SCR reaction efficiency, be then based on prediction SCR reaction efficiency to determine the prediction of exhaust stream 19 Situation.According to such embodiment, repeat to drive SCR reaction simulation module 72, solve mould simultaneously Block 74 adjusts mode input SCR ageing time, makes SCR reaction simulation module 72 based on passing subsequently Increase SCR ageing time prediction SCR reaction efficiency and the corresponding predicted conditions of exhaust stream of input. Solve module 74 and continue this process, until the predicted conditions of exhaust stream 19 is in the sense of exhaust stream 19 In the predetermined tolerance of survey situation.When the predicted conditions of exhaust stream is in the predetermined of the sensing situation of exhaust stream Time in tolerance (that is, model convergence, thus realize solving), solving module 74, to arrange apparent SCR old The change time is equal to mode input SCR ageing time.
In an illustrative embodiments, SCR component management module 62 includes SCR component manager 78, it is disposed for, based on the apparent ageing time of SCR component, being selectively adjusted SCR The operating condition of parts.Such as, the operating condition of SCR component comprises the steps that SCR temperature, quantitatively supplies To speed, reducing agent loadings, EGR, and/or other relevant operating condition.Accomplish this Point, SCR component management module 62 includes SCR efficiency module 76, and it is configured to determine that SCR reacts Efficiency.SCR efficiency module 76 can accomplish this point by following, such as, by one or The empirical data table of multiple functions that SCR reaction efficiency is expressed as SCR ageing time carries out interpolation. Alternatively, SCR efficiency module 76 can one or more that reaction efficiency is characterized as SCR be old by estimation The multi-term expression of the function of change time.
The SCR efficiency module 76 of SCR component management module 62 also calculates the temperature of SCR component. The temperature of SCR component that SCR efficiency module 76 calculates is based on SRC inlet temperature sensor 32, SRC outlet temperature sensors 34, model or any other suitable method.It is only used as example, SCR efficiency module 76 can value based on SRC entrance and SRC outlet temperature sensor 32,34 be come Calculate the temperature of SCR component.It is only used as example, can enter based on SRC in SCR efficiency module 76 Mouth and SRC outlet temperature sensor 32,34 mean value or weighted average calculate described temperature.
Control module 42 includes car speed control module 80, and it controls based on SCR component efficiency Speed (such as, drops below predetermined threshold limit speed when efficiency).Control module 42 is also wrapped Including fuel supply control module 82, it determines fuel quantity, fuel injection timing, delayed injection etc..When When being in invasive SCR component test pattern, SCR component management module 62 adjusts fuel supply. The temperature adjusting increase SCR component of fuel supply.Alternatively, hydrocarbon (or hydrocarbon) injection Module 84 injects fuel in the exhaust of DOC catalyst 28 upstream side, in order to by producing heat release Increase the temperature of SCR component.
As shown in Figure 3, it is provided that a kind of method for controlling SCR component operation, described method is opened Begin with the determination whether to be necessary or whether it needs to be determined that aging (step 100) of SCR component.If So, then the method operated for controlling SCR component includes: receives and reflects and SCR component phase The signal (step 110) of the sensing situation of the exhaust stream 19 closed.Signal can reflect the sensing of exhaust stream NOx content (step 112) and/or the NH of sensing of exhaust stream3Content (step 114), with And signal may originate from the downstream (step 116) of SCR component.
A kind of method for controlling SCR component operation, also includes: according to the sensing situation of exhaust stream Estimate the apparent ageing time (step 120) of SCR component.For estimate SCR component apparent always The method of change time may include that and first arranges mode input SCR ageing time (step 130), Then SCR reaction model (step 140) is performed.Perform SCR reaction model may include that based on Mode input SCR ageing time determines SCR reaction efficiency (step 142) of prediction, is then based on The SCR reaction efficiency of prediction determines the predicted conditions (step 144) of exhaust stream.Pre-by exhaust stream Survey situation compares with the sensing situation of exhaust stream, to determine that they are the most sufficiently close together, or is in In acceptable tolerance (step 146).If it is not, then adjust mode input SCR ageing time (step 148) and again execution SCR reaction model (step 140), until the prediction of exhaust stream In the predetermined tolerance of the sensing situation that situation is in exhaust stream.When achieving at the predicted conditions of exhaust stream Time in the predetermined tolerance of the sensing situation of exhaust stream (or when other suitable convergence criterion realizes Time), apparent SCR ageing time is set equal to mode input SCR ageing time (step 150)。
In one exemplary embodiment, it was predicted that SCR reaction efficiency can determine by the following (step 160): to one or more functions that SCR reaction efficiency is expressed as SCR ageing time Empirical data table carries out interpolation (step 162)；Or estimate and one or more reaction efficiency is characterized as The multi-term expression (step 164) of the function of SCR ageing time.Finally, one is used for controlling The method of SCR component operation also includes: apparent ageing time based on SCR component sets SCR portion The operating condition (step 170) of part.According to the understanding of the improvement aging to SCR component, Ke Yigeng Advantageously control engine and the operation of SCR, such as by improving SCR efficiency, and optionally, Balanced engine fuel consumption, NOx emission and urea consumption (step 172).Such as, by changing Fuel supply (fuel quantity, fuel injection timing, delayed injection etc.) and/or by start, stop, HC injection is increased or decreased, and this control can be increased or decreased delivery temperature.
In some cases, such as, when SCR component has been determined as the most aging, the most described control System can adopt remedial measures, such as, disable exhaust gas recirculatioon (EGR) (step 180).This control The process for exhausting reducing agent loadings can also be started, to set up the most also on SCR component Former dose of loadings (step 182).After reducing agent loadings has exhausted, can restart quantitatively Supply, (that is, is reliably predicted by reducing agent loadings model known to rebuilding on SCR component ) loadings (step 184).By known reducing agent loadings, described control can be measured The efficiency (step 186) of SCR conversion process, such as, based on upstream side and downstream by comparing The efficiency of mass accumulation, and upstream side NOx and the temperature of SCR component.Described control is by comparing The efficiency recorded and the quality (step assessing reducing agent based on efficiency that is above-mentioned aging and that determine 188).If reducing agent quality is not enough, then can carry out extra remedial measure (step 190).This A little measures comprise the steps that lights warning lamp, imposes restrictions on car speed, and invasive delivery temperature manages, And adjust EGR.
Therefore, the illustrative methods operated for controlling SCR component makes it possible to use vehicle-mounted recursive optimization Algorithm, in order to by the output of SCR model is exported or SCR component downstream with being positioned at SCR component The signal that sends of NOx sensor mate, determine SCR ageing time in real time.SCR model base NOx and NH being positioned at SCR component exit is determined in SCR reaction efficiency value3Prediction concentrations, SCR reaction efficiency value is to determine by the SCR efficiency table with SCR ageing time carries out interpolation 's.The aging input of SCR is to float, until NOx and/or NH3Prediction concentrations with from sensor Signal is with enough Accuracy Matching.Model can use the interpolation between such data point, described data Point is predetermined (such as, rule of thumb data or develop in theory), covers ageing step model The SCRNH enclosed3Reaction efficiency table and NH3Desorption and the data point of absorption table.
Therefore, SCR ageing time can determine vehicle-mountedly, and it is aging to SCR adaptively to eliminate system The needs of the understanding of the relation between speed and engine parameter.By avoiding SCR rate of ageing The needs being associated with engine parameter, eliminate and calibrate the plenty of time and cost being associated.This Outward, system and method described herein makes it possible to after vehicle SCR changes (such as, owing to damaging) Determine that SCR's is aging.Finally, by the understanding of the improvement aging to SCR component, can be more favourable Ground controls engine and the operation of SCR, such as, by improving SCR efficiency, and optionally, flat The weighing apparatus fuel consumption of engine, NOx emission and urea consumption.
Although having been described with the present invention with reference to exemplary embodiment, but those skilled in the art should Work as understanding, without departing from the present invention, it is possible to achieve various changes and available etc. Its element is substituted by jljl.Furthermore, it is possible to realize many amendments so that specific situation or material Adapt to the teachings of the present invention, without departing from the essential scope of the present invention.Therefore, it is noted that The invention is not limited in disclosed specific embodiment, but include all falling within the scope of the present application Embodiment.

Claims (20)

1. for the method controlling SCR component operation, comprising:
Receive the signal of the sensing situation reflecting the exhaust stream relevant to described SCR component；
Sensing situation based on described exhaust stream, estimates the apparent ageing time of described SCR component, and does not relies on that SCR is aging and correlation between engine related parameters；
Apparent ageing time based on described SCR component, sets the operating condition of described SCR component, including:
Activating dosing system, described dosing system includes the weight feed injector for spraying reducing agent；
Controlling described weight feed injector, just apparent ageing time based on described SCR component adjusts the weight feed speed of reducing agent.
Method the most according to claim 1, wherein, the signal of the sensing situation that described reception reflects the exhaust stream relevant to described SCR component includes: receive the signal of the NOx content of the sensing reflecting described exhaust stream.
Method the most according to claim 1, wherein, the signal of the sensing situation that described reception reflects the exhaust stream relevant to described SCR component includes: receive the NH of the sensing reflecting described exhaust stream3The signal of content.
Method the most according to claim 1, wherein, the signal of the situation that described reception reflects the exhaust stream relevant to described SCR component includes: receive the signal of the sensing situation of the exhaust stream reflecting described SCR component downstream.
Method the most according to claim 1, wherein, the apparent ageing time of described estimation SCR component includes:
Mode input SCR ageing time is set；
Perform SCR reaction model, including:
Based on described mode input SCR ageing time, determine the SCR reaction efficiency of prediction；And
SCR reaction efficiency based on described prediction, determines the predicted conditions of described exhaust stream；
Adjust described mode input SCR ageing time and perform described SCR reaction model subsequently, until in the predetermined tolerance of the predicted conditions of the described exhaust stream sensing situation that is in described exhaust stream；And
When in the predetermined tolerance of the sensing situation that the predetermined state of described exhaust stream is in described exhaust stream, apparent SCR ageing time is set equal to described mode input SCR ageing time.
Method the most according to claim 5, wherein, the sensing situation of described exhaust stream includes the NOx content of the sensing of described exhaust stream.
Method the most according to claim 5, wherein, the sensing situation of described exhaust stream includes the NH of the sensing of described exhaust stream3Content.
Method the most according to claim 5, wherein, the sensing situation of described exhaust stream is included in the sensing situation in described SCR component downstream.
Method the most according to claim 5, wherein, the described SCR reaction efficiency determining prediction includes: the empirical data table of one or more functions that SCR reaction efficiency is expressed as SCR ageing time is carried out interpolation.
Method the most according to claim 5, wherein, the described SCR reaction efficiency determining prediction includes: estimate the multi-term expression of one or more function that reaction efficiency is characterized as SCR ageing time.
11. 1 kinds of systems being used for controlling SCR component operation, comprising:
SCR SCR component diagnostic module, its signal being configured to receive the sensing situation reflecting the exhaust stream relevant to described SCR component, and sensing situation based on described exhaust stream estimates the apparent ageing time of described SCR component, and do not rely on that SCR is aging and correlation between engine related parameters；And
SCR component manages module, and it is configured to apparent ageing time based on described SCR component and is selectively adjusted the operating condition of described SCR component, including:
Activating dosing system, described dosing system includes the weight feed injector for spraying reducing agent；
Controlling described weight feed injector, just apparent ageing time based on described SCR component adjusts the weight feed speed of reducing agent.
12. systems according to claim 11, wherein, described SCR SCR component diagnostic module is configured to: receive the signal of the NOx content of the sensing reflecting described exhaust stream.
13. systems according to claim 11, wherein, described SCR SCR component diagnostic module is configured to: receive the NH of the sensing reflecting described exhaust stream3The signal of content.
14. systems according to claim 11, wherein, described SCR SCR component diagnostic module is configured to: receive the signal of the sensing situation of the exhaust stream reflecting described SCR component downstream.
15. systems according to claim 11, wherein, described SCR SCR component diagnostic module is configured that
Mode input SCR ageing time is set；
Perform SCR reaction model, including:
Based on described mode input SCR ageing time, determine the SCR reaction efficiency of prediction；
SCR reaction efficiency based on described prediction, determines the predicted conditions of described exhaust stream；
Adjust described mode input SCR ageing time and perform described SCR reaction model subsequently, until in the predetermined tolerance of the predicted conditions of the described exhaust stream sensing situation that is in described exhaust stream；And
When in the predetermined tolerance of the sensing situation that the predicted conditions of described exhaust stream is in described exhaust stream, apparent SCR ageing time is set equal to described mode input SCR ageing time.
16. systems according to claim 15, wherein, described SCR SCR component diagnostic module is configured to: receive the signal of the NOx content of the sensing reflecting described exhaust stream.
17. systems according to claim 15, wherein, described SCR SCR component diagnostic module is configured to: receive the NH of the sensing reflecting described exhaust stream3The signal of content.
18. systems according to claim 15, wherein, described SCR SCR component diagnostic module is configured to: receive the signal of the sensing situation of the exhaust stream reflecting described SCR component downstream.
19. systems according to claim 15, wherein, described SCR SCR component diagnostic module is configured to: the empirical data table of one or more functions that SCR reaction efficiency is expressed as SCR ageing time is carried out interpolation.
20. systems according to claim 15, wherein, described SCR SCR component diagnostic module is configured to: estimate the multi-term expression of one or more function that reaction efficiency is characterized as SCR ageing time.
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