CN103362620A - System and method for controlling exhaust system having selective catalyst reduction component - Google Patents

System and method for controlling exhaust system having selective catalyst reduction component Download PDF

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Publication number
CN103362620A
CN103362620A CN2013102890056A CN201310289005A CN103362620A CN 103362620 A CN103362620 A CN 103362620A CN 2013102890056 A CN2013102890056 A CN 2013102890056A CN 201310289005 A CN201310289005 A CN 201310289005A CN 103362620 A CN103362620 A CN 103362620A
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scr
exhaust stream
ageing time
parts
sense conditions
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CN103362620B (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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    • 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 method for controlling operation of an SCR component includes receiving a signal reflecting a sensed condition of an exhaust stream associated with the SCR component, estimating an apparent aging time of the SCR component based on the sensed condition of the exhaust stream, and setting an operating condition of the SCR component based on the apparent aging time of the SCR component.

Description

Be used for the system and method that control has the vent systems of selective catalytic reduction parts
Technical field
Theme of the present invention relates to vehicle exhaust system, more particularly, relates to the system and method that comprises the vent systems of selective catalytic reduction (SCR) parts for control.
Background technique
The purpose that background mentioned herein is described is to present generally background information of the present invention.Inventor's a part is operated in the background technique part and is described, this part content and when submit applications, do not consist of in addition in this description prior art aspect, both indefinitely impliedly do not admitted to be destruction prior art of the present invention yet.。
In the combustion process of diesel engine, by suction valve air/fuel mixture is inputted cylinder, and compress therein and burn.After the burning, piston pushes vent systems with the exhaust in the cylinder.Exhaust may comprise nitrogen oxide (NOx) and carbon monoxide (CO).
Exhaust-gas treatment system can use the catalyzer of one or more components, and it is configured for realizing the SCR process, and for example nitrogen oxides reduction (NOx) is to produce by nitrogen (N 2) and water (H 2O) the more permissible discharging composition that consists of.Reducing agent can be added in the exhaust of SCR parts upstream, only as example, reducing agent can comprise anhydrous ammonia (NH 3), ammoniacal liquor or urea, any or all these all can be used as mist and spray in the exhaust.When the ammonia that mixes with exhaust arrived the SCR parts, NOx discharged decomposition.Then, diesel particulate filter (DPF) can capture flue dust, and flue dust can periodically be burned in regenerative cycle.Then steam, nitrogen and reduction discharge discharge vent systems.
In order to keep effectively NOx reduction in the SCR parts, can adopt a control mechanism in order to keep reduction dosage required in the SCR parts (that is, reducing agent loadings).When the SCR parts are passed through in the exhaust that contains NOx, will consume reducing agent, and exhaust described loadings.This control mechanism can adopt model to follow the tracks of and/or predict that how many reducing agents are loaded in the SCR parts, and keeps suitable reducing agent loadings to realize desired effect, for example to the reduction of NOx in the exhaust stream.Also can determine the aging of SCR parts by this model, so that the target of control to realize selecting to motor and SCR system perhaps changed in periodic maintenance.The aging favourable control that can help the SCR parts of correct assessment SCR parts, thereby realize the SCR efficient of expectation, and be conducive to the balance between the discharging of operability, output power, fuel consumption and nitrogen oxide at motor, thereby obtain the urea consumption of augmented performance and/or fuel economy and minimizing.
Unfortunately, determine that wearing out of vehicle-mounted SCR parts may be costliness and insecure.For example, conventional method can rely on the SCR aging rate with from the coherence between parameter sensing and that motor is relevant of SCR parts upstream.Yet, SCR aging in fact may with the SCR parts in base reservoir temperature and other conditions of SCR components interior more closely related, these conditions may be the determine precisions that is difficult to suitable.Therefore, but may be expensive according to the aging method with the coherence of the engine parameter of sensing, may need to develop for a long time correlation data, fully be characterized by the function of the aging numerous parameters of impact wearing out, if and do not consider all obvious variablees, then this aging method might be inaccurate.
Therefore, a kind of system and method be need to provide, with prediction vehicle-mounted SCR ageing time, and the engine parameter of institute's sensing and the coherence of high cost do not relied on.People there is also a desire for a kind of improved system and method, are used for the vent systems that control contains the SCR parts, wherein, can determine the aging of SCR parts based on the one or more parameters that affected by the SCR operation of components.
Summary of the invention
In one exemplary embodiment of the present invention, a kind of method for control SCR operation of components, it comprises: the signal that receives the sense conditions that has reflected the exhaust stream relevant with the SCR parts; Based on the sense conditions of exhaust stream, estimate the apparent ageing time of SCR parts; And, based on the apparent ageing time of SCR parts, set the operational condition of SCR parts.
In another exemplary embodiment of the present invention, a kind of system for control SCR operation of components, it comprises: selective catalytic reduction (SCR) ponent design module, it is disposed for receiving the signal of the sense conditions that has reflected the exhaust stream relevant with the SCR parts, and is used for estimating based on the sense conditions of exhaust stream the apparent ageing time of SCR parts.A kind of system for control SCR operation of components also comprises SCR component management module, and it is configured to optionally regulate based on the apparent ageing time of SCR parts the operational condition of SCR parts.
The present invention also provides following solution:
1. method that is used for control SCR operation of components, it comprises:
Reception has reflected the signal of the sense conditions of the exhaust stream relevant with described SCR parts;
Based on the sense conditions of described exhaust stream, estimate the apparent ageing time of described SCR parts;
Based on the apparent ageing time of described SCR parts, set the operational condition of described SCR parts.
2. according to scheme 1 described method, wherein, described reception has reflected that the signal of the sense conditions of the exhaust stream relevant with described SCR parts comprises: the signal that receives the NOx content of the sensing that has reflected described exhaust stream.
3. according to scheme 1 described method, wherein, described reception has reflected that the signal of the sense conditions of the exhaust stream relevant with described SCR parts comprises: the NH that receives the sensing that has reflected described exhaust stream 3The signal of content.
4. according to scheme 1 described method, wherein, described reception has reflected that the signal of the situation of the exhaust stream relevant with described SCR parts comprises: the signal that receives the sense conditions of the exhaust stream that has reflected described SCR components downstream.
5. according to scheme 1 described method, wherein, the apparent ageing time of described estimation SCR parts comprises:
Mode input SCR ageing time is set;
Carry out the SCR reaction model, comprising:
Based on described mode input SCR ageing time, determine the SCR reaction efficiency of prediction; And
Based on the SCR reaction efficiency of described prediction, determine the predicted conditions of described exhaust stream;
Adjust described mode input SCR ageing time and carry out subsequently described SCR reaction model, until the predicted conditions of described exhaust stream is in the predetermined tolerance of sense conditions of described exhaust stream; And
When the predetermined state of described exhaust stream is in the predetermined tolerance of sense conditions of described exhaust stream, apparent SCR ageing time is set equals described mode input SCR ageing time.
6. according to scheme 5 described methods, wherein, the sense conditions of described exhaust stream comprises the NOx content of the sensing of described exhaust stream.
7. according to scheme 5 described methods, wherein, the sense conditions of described exhaust stream comprises the NH of the sensing of described exhaust stream 3Content.
8. according to scheme 5 described methods, wherein, the sense conditions of described exhaust stream is included in the sense conditions of described SCR components downstream.
9. according to scheme 5 described methods, wherein, the SCR reaction efficiency of described definite prediction comprises: one or more posterior infromation tables that the SCR reaction efficiency are expressed as the function of SCR ageing time are carried out interpolation.
10. according to scheme 5 described methods, wherein, the SCR reaction efficiency of described definite prediction comprises: estimate one or more multi-term expressions that reaction efficiency are characterized by the function of SCR ageing time.
11. a system that is used for control SCR operation of components, it comprises:
Selective catalytic reduction SCR ponent design module, it is configured to receive the signal of the sense conditions that has reflected the exhaust stream relevant with described SCR parts, and estimates the apparent ageing time of described SCR parts based on the sense conditions of described exhaust stream; And
SCR component management module, it is configured to optionally regulate based on the apparent ageing time of described SCR parts the operational condition of described SCR parts.
12. according to scheme 11 described systems, wherein, described selective catalytic reduction SCR ponent design block configuration becomes: the signal that receives the NOx content of the sensing that has reflected described exhaust stream.
13. according to scheme 11 described systems, wherein, described selective catalytic reduction SCR ponent design block configuration becomes: the NH that receives the sensing that has reflected described exhaust stream 3The signal of content.
14. according to scheme 11 described systems, wherein, described selective catalytic reduction SCR ponent design block configuration becomes: the signal that receives the sense conditions of the exhaust stream that has reflected described SCR components downstream.
15. according to scheme 11 described systems, wherein, described selective catalytic reduction SCR ponent design block configuration is:
Mode input SCR ageing time is set;
Carry out the SCR reaction model, comprising:
Based on described mode input SCR ageing time, determine the SCR reaction efficiency of prediction;
Based on the SCR reaction efficiency of described prediction, determine the predicted conditions of described exhaust stream;
Adjust described mode input SCR ageing time and carry out subsequently described SCR reaction model, until the predicted conditions of described exhaust stream is in the predetermined tolerance of sense conditions of described exhaust stream; And
When the predicted conditions of described exhaust stream is in the predetermined tolerance of sense conditions of described exhaust stream, apparent SCR ageing time is set equals described mode input SCR ageing time.
16. according to scheme 15 described systems, wherein, described selective catalytic reduction SCR ponent design block configuration becomes: the signal that receives the NOx content of the sensing that has reflected described exhaust stream.
17. according to scheme 15 described systems, wherein, described selective catalytic reduction SCR ponent design block configuration becomes: the NH that receives the sensing that has reflected described exhaust stream 3The signal of content.
18. according to scheme 15 described systems, wherein, described selective catalytic reduction SCR ponent design block configuration becomes: the signal that receives the sense conditions of the exhaust stream that has reflected described SCR components downstream.
19. according to scheme 15 described systems, wherein, described selective catalytic reduction SCR ponent design block configuration becomes: one or more posterior infromation tables that the SCR reaction efficiency are expressed as the function of SCR ageing time are carried out interpolation.
20. according to scheme 15 described systems, wherein, described selective catalytic reduction SCR ponent design block configuration becomes: estimate one or more multi-term expressions that reaction efficiency are characterized by the function of SCR ageing time.
When being discussed in more detail below in conjunction with relevant drawings when of the present invention, above-mentioned feature and advantage and other feature and advantage of the present invention are apparent.
Description of drawings
Only in the mode of example, present further feature, advantage and details in the detailed description to embodiment below, detailed description, in the accompanying drawing:
Fig. 1 is the functional block diagram that comprises the engine control system of exhaust diagnostic system, and according to the present invention, described exhaust diagnostic system is automatically predicted the SCR ageing time;
Fig. 2 is the functional block diagram of an exemplary embodiment of control module of the exhaust diagnostic system of Fig. 1; And
Fig. 3 shows according to method of the present invention, be used for replacement exhaust diagnostic system after the diesel oil reducing agent quality operation of using poor quality.
Embodiment
Following being described in only is exemplary in essence, do not plan to limit by any way invention, its application, or uses.For clarity sake, indicate similar element with identical reference character in the accompanying drawings.As used herein, phrase " at least one among A, B and the C " should be interpreted as meaning to use the logic (A or B or C) of nonexcludability logical "or".But should be appreciated that the step in the method can carry out with different order, and can not change principle of the present invention.
Term used herein " module " refers to: specific integrated circuit (ASIC), electronic circuit, carry out processor (shared, special-purpose or in groups) and the storage of one or more softwares or firmware program, combinational logic circuit, and/or other provides the suitable components of described function.
Although the following discloses content relates to diesel engine, the motor of other types such as petrol engine, comprises direct-injection engine, all can benefit from the instruction of this paper.
According to one exemplary embodiment of the present invention, the invention provides a kind of system and method, be used for predicting the SCR ageing time vehicle-mountedly, and do not rely on the engine parameter that senses and/or SCR is aging and the motor relevant parameter between coherence.The present invention also provides improved system and method, is used for the vent systems that control comprises selective catalytic reduction (SCR) parts.Improved system and method can be determined the aging of SCR parts in real time based on one or more vehicle-mounted parameters, and described parameter directly is subjected to the operating influence (for example, the NOx content of the exhaust stream of SCR components downstream) of SCR parts.
Along with the foundation of SCR ageing time, can carry out control to the operation of engine system with the precision improved and reliability, comprise the control to the operation of SCR parts.For example, can control weight feed, in order to provide suitable reducing agent loadings at the SCR catalyzer.Equally, can manage to improve delivery temperature with the invasive delivery temperature according to exhaust diagnostic system of the present invention, so that the temperature of SCR catalyzer is in a suitable level, to be conducive to the desired operation of SCR parts, perhaps in some cases, allow the efficient of test SCR catalyzer.In some cases, may need to carry out to the speed of vehicle and/or the control of other operating parameter.
Referring now to Fig. 1, it schematically shows diesel engine system 10.Diesel engine system 10 comprises diesel engine 12 and exhaust-gas treatment system 13.Exhaust-gas treatment system 13 also comprises vent systems 14 and dosing system 16.Diesel engine 12 comprises cylinder 18, intake manifold 20, MAF (MAF) sensor 22 and engine rotation speed sensor 24.Air stream flows into diesel engine 12 by intake manifold 20 and is monitored by maf sensor 22.Air is introduced into cylinder 18, and burning occurs with the driven plunger (not shown) with fuel.Although illustrate single cylinder 18, should be appreciated that diesel engine 12 can comprise additional cylinder 18.For example, expectedly, diesel engine has 2,3, and 4,5,6,8,10,12 and 16 cylinders.
The result of combustion process can be in cylinder 18 interior generation exhausts 19.Before exhaust was discharged into the atmosphere, vent systems 14 was processed this exhaust.Vent systems 14 comprises discharge manifold 26 and diesel oxidation catalyst (DOC) 28.Discharge manifold 26 directing exhaust gas leave cylinder and pass through DOC28.In DOC28, process exhaust to reduce discharging.Vent systems 14 also comprises SCR parts 30, DOC inlet 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 between motor and DOC28.SRC inlet temperature sensor 32 is positioned at the upstream of SCR parts 30 with the temperature of monitoring SCR parts 30 ingress.SRC outlet temperature sensor 34 is positioned at the downstream of SCR parts 30 with the temperature in monitoring SCR parts 30 outlet ports.Although being illustrated as, illustrated exhaust-gas treatment system 13 comprises that SRC entrance and the SRC outlet temperature sensor 32,34 that is arranged in SCR parts 30 outsides, SRC entrance and SRC outlet temperature sensor 32,34 can be positioned at SCR parts 30 inboards with the temperature of the exhaust 19 at the entrance and exit place of monitoring SCR parts 30.PF36 further reduces discharging by capturing in the exhaust 19 particle (that is, flue dust).
Dosing system 16 comprises weight feed sparger 40, and the injection of reducing agent of its autoreduction agent in future supply source 38 is mapped in the exhaust 19.Reducing agent mixes with exhaust, and when mixture is exposed to SCR parts 30, further effulent is reduced.Mixer 41 is used in the upstream of SCR parts 30 to be mixed reducing agent with exhaust.Control module 42 is regulated the also operation of control engine system 10.
Exhaust flow rate sensor 44 can produce the signal corresponding with the flow of exhaust 19 in the vent systems.Although show this sensor between SCR parts 30 and PF36, other the various positions in the vent systems can be used to this measurement, comprise the downstream of discharge manifold and the upstream of SCR parts 30.
The particle filtering actuator temperature that temperature transducer 46 produces corresponding to the particle filtering actuator temperature that records.Temperature transducer 46 can place on the PF36 or within.Temperature transducer 46 also can be positioned at upstream or the downstream of PF36.
Other sensors in the vent systems comprise upstream side NOx sensor 50, and its concentration based on the NOx that exists in the vent systems produces the NOx signal.Downstream side NOx sensor 52 can be positioned the downstream of PF36, leaves the NOx concentration of PF36 with measurement, perhaps can place SCR parts 30 downstreams, such as in the layout that closely couples.In addition, ammonia (NH 3) sensor 54 produces the signal corresponding to the amount of ammonia in the exhaust.NH 3Sensor 54 is optional, but owing to has the NOx of distinguishing and NH 3Ability, also can be used for simplified control system.Downstream side NH 3Sensor 54 can be positioned at the PF36 downstream, leaves the NH of PF36 with measurement 3Concentration perhaps can place SCR parts 30 downstreams, such as in the layout that closely couples.Alternatively and/or additionally, hydrocarbon (HC) supply unit 56 and HC sparger 58 can be set, to supply with HC to the exhaust 19 that arrives the DOC catalyzer.
As shown in Figure 2, control module 42 can comprise SCR ponent design module 60, and it is for the NOx transformation efficiency of determining at SCR parts 30 places.Control module 42 also comprises SCR component management module 62, temperature or other parameter of its invasive ground control SCR parts 30.In an illustrative embodiments, SCR ponent design module 60 comprises signal receiver 70 and SCR reaction simulation module 72.Signal receiver 70 is configured to receive the signal of the sense conditions that has reflected the exhaust stream relevant with the SCR parts.SCR reaction simulation module 72 is configured to estimate based on the sense conditions of exhaust stream the apparent ageing time (apparent aging time) of SCR parts.In one exemplary embodiment, the signal receiver of SCR ponent design module 60 70 receives one or more signals that reflect the exhaust stream situation, such as the NH of the sensing of the NOx content of the sensing of the exhaust stream of SCR components downstream and/or exhaust stream 3Content.
In one exemplary embodiment, the SCR reaction simulation module 72 of SCR ponent design module 60 is configured to determine aging (for example, by recursive algorithm or the iterative process) of SCR parts.For example, SCR reaction simulation module 72 can be inputted the SCR ageing time by setting model, and subsequently by the following SCR of execution reaction simulation model: at first determine the SCR reaction efficiency of prediction based on mode input SCR ageing time, then determine the predicted conditions of exhaust stream 19 based on the SCR reaction efficiency of prediction.According to such mode of execution, repeat to drive SCR reaction simulation module 72, find the solution simultaneously module 74 adjustment model input SCR ageing time, subsequently so that SCR reaction simulation module 72 is predicted the predicted conditions of the correspondence of SCR reaction efficiency and exhaust stream based on the SCR ageing time that increases progressively input.Find the solution module 74 and continue these processes, until the predicted conditions of exhaust stream 19 is in the predetermined tolerance of sense conditions of exhaust stream 19.When the predicted conditions of exhaust stream is in the predetermined tolerance of sense conditions of exhaust stream (, model convergence, thereby realize finding the solution), finds the solution module 74 and apparent SCR ageing time is set equals mode input SCR ageing time.
In an illustrative embodiments, SCR component management module 62 comprises SCR unit manager 78, and it is disposed for take the apparent ageing time of SCR parts as basis, the operational condition of optionally regulating the SCR parts.For example, the operational condition of SCR parts can comprise: SCR temperature, weight feed speed, reducing agent loadings, EGR, and/or other relevant operational condition.Accomplish this point, SCR component management module 62 comprises SCR efficient module 76, and it is configured to determine the efficient of SCR reaction.SCR efficient module 76 can be by the following this point of accomplishing, for example, and by one or more posterior infromation tables that the SCR reaction efficiency are expressed as the function of SCR ageing time are carried out interpolation.Alternatively, SCR efficient module 76 can be by estimating one or more multi-term expressions that reaction efficiency are characterized by the function of SCR ageing time.
The SCR efficient module 76 of SCR component management module 62 is also calculated the temperature of SCR parts.The temperature of the SCR parts that SCR efficient module 76 is calculated is based on: SRC inlet temperature sensor 32, SRC outlet temperature sensor 34, model or any other suitable method.Only as example, SCR efficient module 76 can be calculated based on SRC entrance and SRC outlet temperature sensor 32,34 value the temperature of SCR parts.Only as example, can calculate described temperature based on SRC entrance and SRC outlet temperature sensor 32,34 mean values or weighted mean value in SCR efficient module 76.
Control module 42 comprises car speed control module 80, and it comes regulation speed (for example, when decrease in efficiency restricted speed when being lower than predetermined threshold) based on the SCR component efficiencies.Control module 42 also comprises fuel supply control module 82, and it determines fuel quantity, fuel injection timing, delayed injection etc.In the time of in being in invasive SCR unit test pattern, SCR component management module 62 is adjusted fuel and is supplied with.The adjustment that fuel is supplied with increases the temperature of SCR parts.Alternatively, hydrocarbon (or hydrocarbon) jet module 84 injects fuel in the exhaust of DOC catalyzer 28 upstream sides, in order to increase the temperature of SCR parts by producing heat release.
As shown in Figure 3, provide a kind of method for control SCR operation of components, described method starts from determining whether being necessary or no needs are determined aging (step 100) of SCR parts.If so, then comprise for the method for controlling the SCR operation of components: the signal (step 110) that receives the sense conditions that has reflected the exhaust stream 19 relevant with the SCR parts.Signal can reflect the NH of the sensing of the NOx content (step 112) of sensing of exhaust stream and/or exhaust stream 3Content (step 114), and signal can be derived from the downstream side (step 116) of SCR parts.
A kind of method for control SCR operation of components also comprises: the apparent ageing time (step 120) of estimating the SCR parts according to the sense conditions of exhaust stream.The method that is used for the apparent ageing time of estimation SCR parts can comprise: mode input SCR ageing time (step 130) at first is set, then carries out SCR reaction model (step 140).Carrying out the SCR reaction model can comprise: based on the SCR reaction efficiency (step 142) of the definite prediction of mode input SCR ageing time, then determine the predicted conditions (step 144) of exhaust stream based on the SCR reaction efficiency of prediction.The predicted conditions of exhaust stream and the sense conditions of exhaust stream are compared, whether enough approach to determine them, or be in the acceptable tolerance (step 146).If not, adjustment model input SCR ageing time (step 148) and again carry out SCR reaction model (step 140) then, until the predicted conditions of exhaust stream is in the predetermined tolerance of sense conditions of exhaust stream.When the predicted conditions that has realized exhaust stream is in the predetermined tolerance of sense conditions of exhaust stream (perhaps when other suitable convergence criterion realizes), apparent SCR ageing time is configured to equal mode input SCR ageing time (step 150).
In one exemplary embodiment, the SCR reaction efficiency of prediction can be determined (step 160) by the following: one or more posterior infromation tables that the SCR reaction efficiency are expressed as the function of SCR ageing time are carried out interpolation (step 162); Perhaps estimate one or more multi-term expressions (step 164) that reaction efficiency are characterized by the function of SCR ageing time.At last, a kind of method for control SCR operation of components also comprises: the operational condition (step 170) of setting the SCR parts based on the apparent ageing time of SCR parts.According to the understanding to the improvement of SCR part aging, the more advantageously operation of control engine and SCR, for example by improving SCR efficient, and randomly, balanced engine fuel consumption, NOx discharging and urea consumption (step 172).For example, fuel is supplied with (fuel quantity, fuel injection timing, delayed injection etc.) and/or by starting, stop, increasing or reduce the HC injection, this control can increase or reduce delivery temperature by changing.
In some cases, for example, when the SCR parts have been confirmed as enough agingly, then described control can adopt remedial measures, and for example forbids exhaust gas recirculatioon (EGR) (step 180).This control also can start be used to the process that exhausts the reducing agent loadings, to set up reliable reducing agent loadings (step 182) at the SCR parts.After the reducing agent loadings has exhausted, can restart weight feed, to rebuild known (that is, being predicted reliably by reducing agent loadings model) loadings (step 184) at the SCR parts.By known reducing agent loadings, described control can be measured the efficient (step 186) of SCR conversion process, for example, and by the efficient of comparison based on the mass accumulation in upstream side and downstream side, and the temperature of upstream side NOx and SCR parts.Described control is by the efficient that relatively records and the quality (step 188) of assessing reducing agent based on the above-mentioned aging efficient of determining.If the reducing agent quality is not enough, then can carry out extra remedial measure (step 190).These measures can comprise: light beacon, impose restrictions on car speed, and the management of invasive delivery temperature, and adjust EGR.
Therefore, be used for the illustrative methods of control SCR operation of components so that can use vehicle-mounted recursive optimization algorithm, in order to mate with the signal that the NOx sensor that is positioned at SCR knockdown export or SCR components downstream sends by the output to the SCR model, determine in real time the SCR ageing time.The SCR model determines to be positioned at NOx and the NH at SCR knockdown export place based on SCR reaction efficiency value 3Prediction concentrations, SCR reaction efficiency value is to determine by the SCR efficient table with SCR ageing time is carried out interpolation.SCR is aging, and input is floated, until NOx and/or NH 3Prediction concentrations with from the signal of sensor with enough Accuracy Matching.Model can adopt the interpolation between such data point, and described data point is (for example, rule of thumb data or in theory exploitation) of being scheduled to, has covered the SCRNH of ageing step scope 3Reaction efficiency table and NH 3The data point of desorption and absorption table.
Therefore, the SCR ageing time can be determined vehicle-mountedly, and eliminate the needs of system to the understanding of the relation between SCR aging rate and the engine parameter with adapting to.By the needs of having avoided the SCR aging rate is associated with engine parameter, the plenty of time and the cost that are associated with calibration have been saved.In addition, system and method described herein is so that determine that SCR's is aging after changing at vehicle SCR (for example, owing to damage).At last, by the improved understanding to the SCR part aging, the more advantageously operation of control engine and SCR, for example, by raising SCR efficient, and randomly, the fuel consumption of balanced engine, NOx discharging and urea consumption.
Although described the present invention with reference to exemplary embodiment, it will be understood by those of skill in the art that without departing from the present invention, can realize various changes and can utilize equivalent that its element is substituted.In addition, can realize many modifications so that specific situation or material adapt to instruction of the present invention, and can not depart from essential scope of the present invention.Therefore, it is to be noted that the present invention is not limited to disclosed specific embodiment, but comprise that all fall into the embodiment in the application's scope.

Claims (10)

1. method that is used for control SCR operation of components, it comprises:
Reception has reflected the signal of the sense conditions of the exhaust stream relevant with described SCR parts;
Based on the sense conditions of described exhaust stream, estimate the apparent ageing time of described SCR parts;
Based on the apparent ageing time of described SCR parts, set the operational condition of described SCR parts.
2. method according to claim 1, wherein, described reception has reflected that the signal of the sense conditions of the exhaust stream relevant with described SCR parts comprises: the signal that receives the NOx content of the sensing that has reflected described exhaust stream.
3. method according to claim 1, wherein, described reception has reflected that the signal of the sense conditions of the exhaust stream relevant with described SCR parts comprises: the NH that receives the sensing that has reflected described exhaust stream 3The signal of content.
4. method according to claim 1, wherein, described reception has reflected that the signal of the situation of the exhaust stream relevant with described SCR parts comprises: the signal that receives the sense conditions of the exhaust stream that has reflected described SCR components downstream.
5. method according to claim 1, wherein, the apparent ageing time of described estimation SCR parts comprises:
Mode input SCR ageing time is set;
Carry out the SCR reaction model, comprising:
Based on described mode input SCR ageing time, determine the SCR reaction efficiency of prediction; And
Based on the SCR reaction efficiency of described prediction, determine the predicted conditions of described exhaust stream;
Adjust described mode input SCR ageing time and carry out subsequently described SCR reaction model, until the predicted conditions of described exhaust stream is in the predetermined tolerance of sense conditions of described exhaust stream; And
When the predetermined state of described exhaust stream is in the predetermined tolerance of sense conditions of described exhaust stream, apparent SCR ageing time is set equals described mode input SCR ageing time.
6. method according to claim 5, wherein, the sense conditions of described exhaust stream comprises the NOx content of the sensing of described exhaust stream.
7. method according to claim 5, wherein, the sense conditions of described exhaust stream comprises the NH of the sensing of described exhaust stream 3Content.
8. method according to claim 5, wherein, the sense conditions of described exhaust stream is included in the sense conditions of described SCR components downstream.
9. system that is used for control SCR operation of components, it comprises:
Selective catalytic reduction SCR ponent design module, it is configured to receive the signal of the sense conditions that has reflected the exhaust stream relevant with described SCR parts, and estimates the apparent ageing time of described SCR parts based on the sense conditions of described exhaust stream; And
SCR component management module, it is configured to optionally regulate based on the apparent ageing time of described SCR parts the operational condition of described SCR parts.
10. system according to claim 9, wherein, described selective catalytic reduction SCR ponent design block configuration is:
Mode input SCR ageing time is set;
Carry out the SCR reaction model, comprising:
Based on described mode input SCR ageing time, determine the SCR reaction efficiency of prediction;
Based on the SCR reaction efficiency of described prediction, determine the predicted conditions of described exhaust stream;
Adjust described mode input SCR ageing time and carry out subsequently described SCR reaction model, until the predicted conditions of described exhaust stream is in the predetermined tolerance of sense conditions of described exhaust stream; And
When the predicted conditions of described exhaust stream is in the predetermined tolerance of sense conditions of described exhaust stream, apparent SCR ageing time is set equals described mode input SCR ageing time.
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