CN105143618A - Reintroduction of air in delivery system accumulator - Google Patents

Reintroduction of air in delivery system accumulator Download PDF

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Publication number
CN105143618A
CN105143618A CN201480021315.2A CN201480021315A CN105143618A CN 105143618 A CN105143618 A CN 105143618A CN 201480021315 A CN201480021315 A CN 201480021315A CN 105143618 A CN105143618 A CN 105143618A
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CN
China
Prior art keywords
storage
pressure
reducing agent
air
metering valve
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Granted
Application number
CN201480021315.2A
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Chinese (zh)
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CN105143618B (en
Inventor
黄威
柴永全
王丽
张述
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Cummins Intellectual Property Inc
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Cummins Intellectual Property Inc
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Publication of CN105143618A publication Critical patent/CN105143618A/en
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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]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1466—Means for venting air out of conduits or tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
    • 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

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

Abstract

According to one embodiment, an apparatus for reintroducing air includes a bypass valve that reduces pressure in an accumulator that stores reductant to less than an air supply pressure of an air supply. The apparatus also includes a metering valve that fills the accumulator with air from the air supply at the air supply pressure, and a pump that pumps reductant into the accumulator.

Description

Introducing again of air in the storage of transporting system
The cross reference of related application
This application claims the interests that the application number submitted on March 15th, 2013 is the U.S. Provisional Patent Application of 61/788,484, it is incorporated to herein by reference.
Field
The application relates generally to internal-combustion engine system, and relates more specifically to the reducing agent transporting system for exhausted gas post-processing system.
Background
Typical exhausted gas post-processing system comprises the assembly of the level reducing the harmful exhaust emissions occurred in waste gas.Emissions requirements changes according to engine type.Such as, discharge detection about compression ignition engine (e.g., diesel fuel-powered engine) monitors the concentration of carbon monoxide, nitrogen oxide (NOx) and the unburnt hydrocarbon (UHC) discharged from outlet pipe usually to guarantee to leave the concentration of these compounds of outlet pipe within specific emission standard.Exhausted gas post-processing system can adopt selective catalytic reduction (SCR) assembly with by NOx conversion for nitrogen and other compound.
Common exhausted gas post-processing system utilizes reducing agent (being generally diesel exhaust treatment fluid (DEF), such as aqueous solution of urea, ammonia etc.) as reagent to reduce the NOx in waste gas.Reducing agent by dosing (dose) to waste gas streams to transform harmful effulent.Exhausted gas post-processing system can adopt has storage and compressed-air actuated reducing agent transporting system to carry the reducing agent of compression for dosing waste gas.The pressure of the air Absorbable organic halogens reducing agent in storage.Unfortunately, during dosing, air can move from storage.
General introduction
The state present in response to related domain and especially in response to problem and the demand of the related domain also do not solved completely by current available exhausted gas post-processing system, developed the theme of the application.Correspondingly, the theme of the application is by the device, the method and system that develop to be provided for be introduced by air in reducing agent transporting system storage again.
According to a mode of execution, comprise by-pass valve for the device introducing air again, the pressure in the storage of storage and reduction agent is reduced to the bleed pressure being less than source of the gas source of the gas (airsupply) by it.This device also comprises metering valve and pump, and the air of metering valve from source of the gas fills storage with bleed pressure, and reducing agent is pumped in storage by pump.
In some of device realize, the pressure in storage is reduced to the bleed pressure that is less than source of the gas with in response to the timer exceeding predetermined threshold by by-pass valve.Predetermined threshold can comprise elevated pressures threshold value and lower pressure threshold value.When the pressure be greater than in elevated pressures threshold value or storage of the pressure in storage be less than comparatively Low threshold time, timer will increase progressively (increment).In specific implementation, elevated pressures threshold value is relevant to the first predetermined percentage of this goal pressure higher than goal pressure, and lower pressure threshold value is relevant to the second predetermined percentage of this goal pressure lower than goal pressure.First predetermined percentage and the second predetermined percentage can about between 10% and 30%.
According to the specific implementation of device, the pressure in storage is reduced to the bleed pressure that is less than source of the gas with expiring in response to filling time interval by by-pass valve.Filling time interval can between about 4 hours and about 16 hours.
In some implementations, from storage, eject to allow the reducing agent in storage the pressure reduced in storage by opening by-pass valve.In addition, when by-pass valve is opened, metering valve can cut out to stop and utilize the air from source of the gas to fill storage.In addition, when by-pass valve is opened and when metering valve is when filling storage with air, pump can stop reducing agent being pumped into storage.
According to another mode of execution, the exhausted gas post-processing system that internal-combustion engine system comprises internal-combustion engine and processes from the waste gas of internal-combustion engine.Internal-combustion engine system also comprises the reducing agent transporting system providing reducing agent to exhausted gas post-processing system.Reducing agent transporting system also comprises reducing agent source, the storage of storage and reduction agent and the by-pass valve in storage downstream and upstream, reducing agent source.By-pass valve is operable as the bleed pressure Pressure Drop in storage being low to moderate the source of the gas being less than by-pass valve downstream.Reducing agent transporting system is also included in storage and by-pass valve downstream and at the metering valve of gas source upstream.Metering valve is operable as and utilizes the air from source of the gas to fill storage with bleed pressure.In addition, reducing agent transporting system is included in downstream, reducing agent source and pump in storage upstream.Pump can operate and be pumped in storage with the reducing agent in autoreduction agent in future source.
In some implementations, internal-combustion engine also comprises controller, the pressure in its monitoring storage, and stops pump, closedown metering valve open by-pass valve when the amplitude of the pressure oscillation in storage meets threshold value.When the pressure be greater than in elevated pressures threshold value or storage of the pressure in storage be less than comparatively Low threshold time, timer increases progressively.Timer can be used to determine the amplitude of pressure oscillation.Engine system also can comprise the reductant nozzle of reducing agent injection from the waste gas of internal-combustion engine.After discharging reducing agent by by-pass valve from storage, controller can be closed by-pass valve and be opened metering valve.In some implementations, when the pressure in storage is equal to or less than bleed pressure, controller is closed metering valve and is started pump.
According to another mode of execution, the method for introducing air again comprises the pressure in the storage of storage and reduction agent is reduced to the bleed pressure being less than source of the gas.The metering valve that the method also comprises by storage being connected to source of the gas utilizes air to fill storage with bleed pressure.In addition, method comprises and being pumped in storage from pump by reducing agent.
In some implementations, method comprise the volume of air detected in storage, stop pump with in response to the low volume of air of instruction the volume of air detected, close metering valve with in response to the low volume of air of instruction the volume of air detected and open by-pass valve to be discharged by reducing agent with in response to stopping pump with close metering valve from storage.Method closes by-pass valve after can being included in and being discharged from storage by reducing agent.In addition, method opens metering valve after can being included in and being discharged from storage by reducing agent, after reducing agent being discharged from storage, there is provided air to storage until the pressure in storage reaches bleed pressure by metering valve with bleed pressure, the air pressure in storage is closed metering valve and is pumped in storage from pump by reducing agent after storage reaches bleed pressure and metering valve is closed after reaching bleed pressure.
Run through this specification to feature, the quoting or similar language do not mean that all feature and advantage that can be implemented together with theme of the present disclosure be or in any single mode of execution of advantage.On the contrary, mention that the language of feature and advantage is understood to mean that special characteristic, advantage or characteristic described by being combined with mode of execution are comprised at least one mode of execution of the present disclosure.Therefore, run through this specification to the discussion of feature and advantage and similar language can but identical mode of execution need not be referred to.
Described feature, structure, advantage and/or the characteristic of theme of the present disclosure can in any suitable manner in one or more mode of execution and/or combinations in realizing.In the following description, many concrete details are provided to give to understand thoroughly the mode of execution of theme of the present disclosure.Various equivalent modifications will be recognized, theme of the present disclosure can not had in the specific features of particular embodiment or realization, details, assembly, material and/or method by putting into practice one or more.In other example, supplementary features and advantage can be realized at some mode of execution and/or in realizing, and may not appear in all mode of executions or realization.In addition, in some instances, well-known structure, material or operation are not illustrated or describe in detail to avoid making the aspect of theme of the present disclosure fuzzy.The feature and advantage of theme of the present disclosure obviously or by practical matter (as hereafter set forth) are learnt more fully by becoming from description below and claims.
Accompanying drawing is sketched
In order to more easily understand the advantage of theme, above, concise and to the point the describing more specifically of theme described presents by reference to concrete mode of execution illustrated in the accompanying drawings.The typical mode of execution that these accompanying drawings only describe theme should be understood and be not therefore counted as restriction on its scope, by by using accompanying drawing to utilize additional characteristic sum details describe and explain theme, in the accompanying drawings:
Fig. 1 shows the schematic block diagram of a mode of execution of internal-combustion engine system;
Fig. 2 shows the schematic block diagram of a mode of execution of reducing agent transporting system;
Fig. 3 shows the flow chart of a mode of execution of the method for introducing air again; And
Fig. 4 shows the plotted curve of the mode of execution introducing air again.
Describe in detail
Fig. 1 shows the schematic block diagram of a mode of execution of internal-combustion engine system 190.System 190 comprises internal-combustion engine 195, exhausted gas post-processing system 180 and reducing agent transporting system 100.Internal-combustion engine 195 combustion fuel, produces mechanical energy and Exhaust Gas.Waste gas comprises the environmentally harmful composition of such as NOX.Therefore, these compositions are changed into the less by-product of harm by system 100.
Waste gas is processed by exhausted gas post-processing system 180.In one embodiment, exhausted gas post-processing system 180 reducing agent dosing waste gas.Reducing agent can be diesel exhaust treatment fluid (DEF).Reducing agent transporting system 100 can provide reducing agent to exhausted gas post-processing system 180.
Fig. 2 shows the schematic block diagram of a mode of execution of reducing agent transporting system 100.System 100 comprises reducing agent tank body 110, pump 115, storage 120, metering valve 130, source of the gas 125, controller 155 and nozzle 160.
Reducing agent tank body 110 storage and reduction agent also provides reducing agent to pump 115.Reducing agent in reducing agent tank body 110 can with incoming pressure P in140.In one embodiment, P in140 is external pressures.Reducing agent is pumped in storage 120 by pump 115.Pump 115 can with the first pressure P 1145 pumping reducing agents.First pressure 145 can in 450 to 650 kPas of (kPa) scopes.In one embodiment, target first pressure 145 is 500kPa.
Storage 120 has been loaded air.The air being positioned at the top of the cavity of storage 120 is well-known to those skilled in the art.Reducing agent is by entering and exit storage 120 lower than the port of air level.Therefore, air is prevented from direct outflow port.
Metering valve 130 measures the reducing agent from storage 120 to nozzle 160.Reducing agent can mix with the pressurized air from source of the gas 125.The bleed pressure P of source of the gas 125 2150 can in the scope of 350 to 450kPa.In one embodiment, bleed pressure 150 can be 400kPa.Nozzle 160 can use reducing agent dosing waste gas.Source of the gas 125 can be braking gas source.Pressure transducer 175 can measure the bleed pressure P of source of the gas 125 2150.Force value can be passed to controller 155 by pressure transducer 175.
By-pass valve 135 can be opened to allow reducing agent to flow to reducing agent tank body 110 from storage 120.By-pass valve 135 and metering valve 130 can open and close with in response to the order carrying out self-controller 155.Controller 155 can the operation of control pump 115 and the opening and closing of metering valve 130 and by-pass valve 135.In addition, controller 155 can receive the force value from pressure transducer 170,175.
Controller 155 can comprise processor and computer-readable recording medium.Computer-readable recording medium can store computer readable program code.Processor can perform computer readable program code to implement the function of controller 155.
Storage 120 makes the reducing agent of the first pressure 145 stablize.When the first pressure 145 increases, such as, when metering valve 130 is closed, air is compressed, to suppress the increase of the first pressure 145.Similarly, when the first air pressure 145 reduces, such as, when metering valve 130 is opened, the air in storage 120 expands, to suppress the reduction of the first pressure 145.Pressure transducer 170 can measure the first pressure 145.
In one embodiment, metering valve 130 accurately measures reducing agent to guarantee that waste gas is not with insufficient reducing agent dosing or do not apply too many reducing agent.But if the first pressure 145 vibrates significantly, then reducing agent can not accurately be measured.Therefore, the air in storage 120 suppresses the first pressure 145 that reducing agent can be measured more accurately.
Unfortunately, although air directly can not flow out the port of storage 120, air is really dissolved in reducing agent and flows out storage 120 together with reducing agent.Therefore, the volume of air in storage 120 reduces along with passing of time.Such as, after internal-combustion engine system 190 runs 8 to 12 hours, the air in storage 120 can have insufficient volume to suppress the first air pressure 145.
When there is insufficient air in storage 120, the vibration of the first pressure 145 increases.Therefore, be not too accurate from the metering of the reducing agent of metering valve 130 to nozzle 160.
Can be used to again load storage 120 from the air of filling air line that is special, pressurization.But the interpolation of this special-purpose air pipeline and required valve, control and source of the gas can increase cost and reduce the reliability of storage 120.Air is introduced in storage 120 and is not needed special filling pipeline by mode of execution described herein again.Therefore, again storage 120 (as will be described below) can be loaded termly with air.In one embodiment, the introducing again of air is implemented by device 175, and device 175 is made up of pump 115, storage 120, metering valve 130, by-pass valve 135 and controller 155.
Fig. 3 shows the flow chart of a mode of execution of the method 500 for introducing air again.Method 500 can be implemented by device 175, reducing agent transporting system 100 and internal-combustion engine system 190.In one embodiment, the function of controller 155 control pump 115, metering valve 130 and by-pass valve 135 to implement the method 500.
Method 500 starts, and in one embodiment, detects the volume of air in storage 120 in step 502 place controller 155.Can based on the oscillation test volume of air in the first pressure 145 in step 502 place controller 155.Controller 155 can record the force value from pressure transducer 170.In some implementations, controller 155 can use the vibration in timer or counter records first pressure 145.When the first pressure 145 exceeds elevated pressures threshold value or drops to lower than lower pressure threshold value when the first pressure, timer or counter increment.If pressure oscillation (as indicated by timer or counter) exceeds threshold value, then can detect low air volume conditions (as will be described later) in step 502 place controller 155.
Pressure threshold can in the scope being greater than or less than goal pressure 10% to 30%.Such as, if the goal pressure of the first pressure 145 is 500kPa, then pressure threshold can add and subtract the goal pressure of 10% or adds and subtract 150kPa.
In one embodiment, volume of air in storage 120 is detected with expiring in response to filling time interval in step 502 place controller 155.Filling time interval can in the scope of 4 to 16 hours.In specific mode of execution, be interposed between in the scope of 6 to 10 hours between filling time.Such as, if filling time interval is eight hours, then within every eight hours, volume of air can be detected in step 502 place controller 155.
In one embodiment, pump 115 is stopped in step 504 place controller 155.Therefore, the reducing agent in storage 122 is not forced into the first pressure 145 by pump 115.In addition, controller 155 can close metering valve 130.
The first pressure 145 in storage 120 can be reduced in step 506 place by-pass valve 135.In one embodiment, controller 155 opens by-pass valve 135, flows in reducing agent tank body 110 to reduce the first pressure 145 in step 506 from storage 120 to allow the reducing agent in storage 120.By-pass valve 135 can reduce the first pressure 145 in step 506 place until the first pressure 145 is less than bleed pressure 150.In one embodiment, reducing agent is discharged in reducing agent tank body 110 from storage 120.
By-pass valve 135 can be closed with in response to the order carrying out self-controller 155 in step 508 place.If the first pressure 145 is less than bleed pressure 150, then controller 155 can only close by-pass valve 135 in step 508 place.In one embodiment, if the first pressure 145 is the pressure differences being less than bleed pressure 150, then by-pass valve 135 is closed in step 508 place controller 155.Pressure difference can in the scope of the bleed pressure 150 of 5% to 25%.
Metering valve 130 can be opened in step 510 place.In one embodiment, and if if by-pass valve 135 is closed the first pressure 145 be less than bleed pressure 150, then open metering valve 130 in step 510 place controller 155.
The air from source of the gas 125 can be utilized to fill storage 120 with bleed pressure 150 in step 512 place metering valve 130.In one embodiment, open to fill storage 124 introducing again in the time lag of specifying in step 512 place metering valve 130.Introducing the time lag again can in the scope of 2 to 20 seconds.Because bleed pressure 150 is greater than the first pressure 145, so air flows through metering valve 130 and flows into storage 120.
In one embodiment, introduce again the time lag expire after, close metering valve 130 in step 514 place controller 155.Alternatively, when the first pressure 145 equals bleed pressure 150, metering valve 130 is closed in step 514 place controller 155.
Reducing agent can be pumped in storage 120 and method 500 terminates in step 516 place pump 115.When reducing agent is pumped into storage 120 and is pressurized to the first pressure 145, some air residue in storage 120.Therefore, air is incorporated into storage 120 and storage 120 has sufficient volume of air effectively to suppress the vibration of the first pressure 145 again.
Fig. 4 shows the curve Figure 200 of the mode of execution introducing air again.Curve Figure 200 shows the first pressure 145 of reducing agent and reducing agent and is admitted to the bleed pressure 150 of mixture of air of pressurization of nozzle 160.Curve Figure 200 further depict by-pass valve 135 and metering valve 130 transition between open and closed positions.
As depicted, metering valve 130 is opened to provide reducing agent to nozzle 160.As shown in 100 to 190 seconds, when the volume of air of storage 120 is low, because metering valve 130 opens to discharge reducing agent and cuts out to keep reducing agent, so storage 120 can not reduce the vibration 225 of the first pressure 145 fully.
In described mode of execution, the vibration 225 of the first pressure 145 exceeds by higher thresholds and the pressure threshold scope that limits compared with Low threshold 220a, 220b.Controller 155 can exceed pressure threshold 220 according to the vibration of the first pressure 145 and determine that the volume of air in storage 120 is low.Controller 155 can use timer or counter, when the first pressure 145 exceeds higher thresholds 220a or drop to lower than comparatively Low threshold 220b, and this timer or counter increment.Once timer or counter meet or exceed threshold value, then the low air volume conditions of storage 120 can be detected.In response to the low volume of air detected in storage 120, controller 155 can close 205 metering valves 130.In addition, controller 155 can stop pump 115.
By-pass valve 135 opens 210 to reduce the first pressure 145.In one embodiment, controller 155 opens by-pass valve 135 until the first pressure 145 is less than 215 bleed pressures 150.When the first pressure 145, controller 155 also can close 211 by-pass valves 135.In one embodiment, when the first pressure 145 is less than 215 bleed pressure 150, controller 155 closes 211 by-pass valves 135.
Metering valve 130 utilizes the air from source of the gas 125 to fill storage 120 with bleed pressure 150.If the first pressure 145 is less than 215 bleed pressures 150, then controller 155 can open metering valve 130.Because bleed pressure 150 is greater than the first pressure 145, air flows into storage 120 from source of the gas 125 by metering valve 130, to be introduced in storage 120 by air again.
Controller 155 closes 235 metering valves 130.Introduce again the time lag expire after, controller 155 can close 235 metering valves 130.Alternatively, when the first pressure 145 equals bleed pressure 150, controller 155 can close 235 metering valves 130.
Reducing agent pumping 240 enters in storage 120 with the first pressure 145 by pump 115, and wherein, the first pressure 145 is stabilized near goal pressure.Because storage 120 has been loaded air again, so when metering valve 130 recovers to open 245, reduce the vibration 255 of the first pressure 145 widely.
By air is introduced storage 120 again, mode of execution alleviates the consumption of the air from storage 120, because air to be dissolved in reducing agent and removed by from storage 120.Therefore, storage 120 stabilizes the first pressure of reducing agent and reducing agent transporting system 100 provides reducing agent to nozzle 160 and exhausted gas post-processing system 180 more accurately.Exhausted gas post-processing system 180 more effectively operates, to reduce environmental contaminants.In addition, by reducing the peak value of the first pressure 145, the impact of assembly at design pressure range of operation and not easily frayed and fault.
Above-described indicative flowchart diagram and method schematic illustrations are set forth usually used as logical flow chart diagram.Like this, the order described and the step of mark indicate representational mode of execution.Can conceive other step, sequence and method, it is equivalent to one or more step or its part of the method shown in schematic illustrations in function, logic OR effect.
In addition, the form adopted and symbol are provided to explain the logic step of schematic illustrations and are understood to the scope of the method do not limited shown by diagram.Although various arrow types and line type can be used in schematic illustrations, they are understood to the scope not limiting corresponding method.Really, some arrows or other connector can be used to the logic flow of only indicating means.Such as, arrow can indicate institute's plotting method cited step between the wait of unspecified period or monitoring periods.In addition, the order that wherein specific process occurs maybe can cannot strictly observe the order of shown corresponding step.
The many functional element described in this specification are marked as function, to emphasize the independence of their realization in more detail.Such as, function can be implemented as hardware circuit, and this hardware circuit comprises the VLSI circuit of customization or gate array, such as logic chip, the existing semiconductor of transistor or other discrete assemblies.Function also can realize in the programmable hardware device of such as field programmable gate array, programmable logic array, programmable logic device etc.
Function also can realize in the software for being performed by various types of processor.Such as, the identifiable design function of executable code can comprise one or more physical block or the logical block of computer order, and such as, this computer order can be organized as object, process or function.But, the executable program of identifiable design function does not need physically to be put together, but can comprise the complete incoherent instruction being stored in diverse location, its (when logically being linked together) comprises function and realizes the object about the defined of this function.
Really, the function of computer readable program code can be single instruction or a lot of instruction, and even can be distributed in some different code segments and the some memory devices of range spans among different programs.Similarly, operating data can be identified herein and illustrate in function, and any suitable form can embody and be organized in the data structure of any suitable type.Operating data can be collected as single File, maybe can be distributed on different positions and (comprise and being distributed on different storage facilities), and can only be present on system or network as electronic signal at least in part.When the part of function or function realizes in software, computer readable program code can store and/or propagate in one or more computer-readable recording medium.
Computer-readable medium can be the readable storage medium of tangible computer of store computer-readable program-code.Computer-readable storage media can be such as but not limited to electronics, magnetic, optics, electromagnetism, infrared rays, holographic, micromechanics or semiconductor system, device or equipment or aforesaid any combination suitably.
The example more specifically of computer-readable medium can include but not limited to portable computer diskette, hard disk, random access memory (RAM), ROM (read-only memory) (ROM), Erasable Programmable Read Only Memory EPROM (EPROM or flash memory), portable compact disc ROM (read-only memory) (CD-ROM), digital versatile disc (DVD), optical storage device, magnetic storage facilities, holographic storage medium, micromechanics storage facilities or aforesaid any appropriately combined.In the context of the document, computer-readable storage media can be any tangible medium, its can comprise and/or store for by instruction execution system, device or equipment use and/or computer readable program code that and instruction executive system, device or equipment are combined.
Computer-readable medium can also be computer readable signal media.Computer-readable medium can comprise the data-signal of propagation, and computer readable program code embodies wherein (such as in a base band or as the part of carrier wave).This propagable signal can take in various ways any one, various forms includes but not limited to electronics, electromagnetism, magnetic, optics or its any combination suitably.Computer readable signal media can be any computer-readable medium, and it is not computer-readable storage media and can transmits, propagates or carry the computer readable program code for being combined by instruction execution system, device or equipment use or and instruction executive system, device or equipment.The computer readable program code that computer readable signal media embodies can use any applicable medium to transmit, and any applicable medium includes but not limited to wireless, wired, optical cable, radio frequency (RF) etc. or aforesaid any combination suitably.
In one embodiment, computer-readable medium can comprise the combination of one or more computer-readable storage media and one or more computer readable signal media.Such as, computer readable program code is propagated as electromagnetic signal for being executed by processor and being stored on RAM storage facilities for being executed by processor both by optical cable.
Computer readable program code for implementing the operation of aspect of the present invention can be write with any combination of one or more programming language, and one or more programming language comprises Object-Oriented Programming Language (such as Java, Smalltalk, C++ etc.) and conventional program programming language (such as " C " programming language or similar programming language).Computer readable program code can completely on the computer of user perform, part perform on the computer of user as stand alone software bag perform, part on the computer of user perform and part on the remote computer perform or perform completely on the remote computer or on server.To perform on the computer of user and part performs on the remote computer or completely on the remote computer or in the scheme that server performs in part, remote computer is connected to (comprising Local Area Network (LAN) or long haul network (WAN)) computer of user by the network of any type, or outer computer (such as, by using the internet of ISP) can be connected to.
Run through this specification and " mode of execution (oneembodiment) ", " mode of execution (anembodiment) " or quoting of similar language are meaned that specific feature, structure or the characteristic described in conjunction with this mode of execution is comprised at least one mode of execution of the present invention.Therefore, run through the phrase " in one embodiment (inoneembodiment) " of this specification, " in embodiments (inanembodiment) " and similar language appearance can but be not must mode of execution that all finger is identical.Similarly, the use of term " realization " means that realization has the specific feature, structure or the characteristic that describe in conjunction with one or more mode of execution of the present disclosure, but lack clear and definite coherence unless indicated otherwise, realization can be relevant to one or more mode of execution.
In superincumbent description, particular term can be used, particular term such as " on ", D score, " higher ", " lower ", " level ", " vertical ", "left", "right" etc.When processing relevant relation, these terms are under applicable circumstances by some clarity using to provide a description.But these terms are not intended to imply absolute relation, position and/or orientation.Such as, relative to object, simply by inversion-object, " higher " surface can be changed into " lower " surface.But it remains identical object.In addition, term " comprises (including) ", " comprising (comprising) ", " having (having) " and its change mean " including but not limited to ", points out clearly unless otherwise.The term list enumerated does not imply that any or all of term in term is mutually exclusive and/or comprises mutually, points out clearly unless otherwise.Term " one (a) ", " one (an) " and " being somebody's turn to do (the) " also refer to " one or more ", point out clearly unless otherwise.
In addition, element is " coupled " to the example in this specification of another element and can comprises directly and INDIRECT COUPLING wherein.Direct-coupling can be defined as a component couples to another element has some to contact with this another element.INDIRECT COUPLING can be defined as coupling not directly contact mutually between the two elements, but between be coupled element, have one or more additional element.In addition, as used herein, an element being fixed to another element can comprise directly fixing and indirectly fixing.In addition, as used herein, " contiguous (adjacent) " must not represent contact.Such as, an element can be close to another element and not contact with this element.
As used herein, when phrase " wherein at least one (atleastoneof) " uses together with item list, mean that the various combination of one or more in listed item can be used and only can need an item in the item in list.Item can be specific object, things or classification.In other words, " wherein at least one " means that any combination of item or some can be used by from list, but can not need the whole items in list.Such as, " in item A, item B and item C at least one " may imply that an A; Item A and item B; Item B; Item A, item B and item C; Or item B and item C.In some cases, such as, " in item A, item B and item C at least one " may imply that and do not limit two item A, an item B and ten item C; Four item B and seven item C; Or some other suitable combinations.
The disclosure can embody with other true-to-shape and not depart from its spirit or intrinsic propesties.Described mode of execution will be considered to be only illustrative and nonrestrictive in all respects.Therefore, the scope of the present disclosure is indicated by claims instead of is indicated by description above.Belong to the meaning of the equivalence of claim and scope change and will be comprised in their scope.

Claims (20)

1., for introducing a device for air again, comprising:
By-pass valve, the pressure in the storage of storage and reduction agent is reduced to the bleed pressure being less than source of the gas by described by-pass valve;
Metering valve, described metering valve utilizes with described bleed pressure and fills described storage from the air of described source of the gas; And
Pump, reducing agent is pumped in described storage by described pump.
2. device as claimed in claim 1, wherein, the pressure in described storage is reduced in response to the timer exceeding predetermined threshold the described bleed pressure being less than described source of the gas by described by-pass valve.
3. device as claimed in claim 2, wherein, described predetermined threshold comprises elevated pressures threshold value and lower pressure threshold value, and described timer increases progressively when the pressure be greater than in described elevated pressures threshold value or described storage of the pressure in described storage is less than described lower pressure threshold value.
4. device as claimed in claim 3, wherein, described elevated pressures threshold value is relevant to the first predetermined percentage of described goal pressure higher than goal pressure, and described lower pressure threshold value is relevant to the second predetermined percentage of described goal pressure lower than goal pressure.
5. device as claimed in claim 4, wherein, described first predetermined percentage and described second predetermined percentage are about between 10% and 30%.
6. device as claimed in claim 1, wherein, the pressure in described storage is reduced in response to expiring of filling time interval the described bleed pressure being less than described source of the gas by described by-pass valve.
7. device as claimed in claim 6, wherein, is interposed between described filling time between about 4 hours and about 16 hours.
8. device as claimed in claim 1, wherein, described by-pass valve is by opening to allow the reducing agent in described storage to eject the pressure reduced in described storage from described storage.
9. device as claimed in claim 8, wherein, when described by-pass valve is opened, described metering valve cuts out and fills described storage to stop with the air from described source of the gas.
10. device as claimed in claim 9, wherein, when described by-pass valve is opened and when described metering valve is when filling described storage with air, reducing agent is pumped in described storage by described pump stopping.
11. 1 kinds of internal-combustion engine systems, comprising:
Internal-combustion engine;
Exhausted gas post-processing system, described exhausted gas post-processing system process is from the waste gas of described internal-combustion engine;
Reducing agent transporting system, described reducing agent transporting system provides reducing agent to described exhausted gas post-processing system, and comprises:
Reducing agent source;
Storage, the agent of described storage storage and reduction;
By-pass valve; Described by-pass valve is in the downstream of described storage and in the upstream in described reducing agent source, and described by-pass valve can operate the bleed pressure the pressure in described storage to be reduced to the source of the gas be less than in described by-pass valve downstream;
Metering valve, described metering valve is in the downstream of described storage and described by-pass valve and in the upstream of described source of the gas, and described metering valve can operate to utilize with described bleed pressure fills described storage from the air of described source of the gas; And
Pump, described pump described reducing agent source downstream and in the upstream of described storage, described pump can operate and is pumped in described storage by the reducing agent from described reducing agent source.
12. internal-combustion engine systems as claimed in claim 11, also comprise controller, the pressure in storage described in described monitoring control devices and stop described pump when the amplitude of the pressure oscillation in described storage meets threshold value, close described metering valve and open described by-pass valve.
13. internal-combustion engine systems as claimed in claim 12, wherein, when the pressure be greater than in elevated pressures threshold value or described storage of the pressure in described storage is less than lower pressure threshold value, timer increases progressively, further, the amplitude of described pressure oscillation uses described timer to determine.
14. internal-combustion engine systems as claimed in claim 12, also comprise reductant nozzle, and reducing agent is injected the waste gas from described internal-combustion engine by described reductant nozzle.
15. internal-combustion engine systems as claimed in claim 12, wherein, after reducing agent is discharged from described storage by described by-pass valve, described controller is closed described by-pass valve and is opened described metering valve.
16. internal-combustion engine systems as claimed in claim 15, wherein, when the pressure in described storage is equal to or less than described bleed pressure, described controller is closed described metering valve and is started described pump.
17. 1 kinds, for introducing the method for air again, comprising:
Pressure in the storage of storage and reduction agent is reduced to the bleed pressure being less than source of the gas;
Air is utilized to fill described storage by the metering valve described storage being connected to described source of the gas with described bleed pressure; And
Reducing agent is pumped in described storage from pump.
18. methods as claimed in claim 17, also comprise:
Detect the volume of air in described storage;
Described pump is stopped in response to detected volume of air indicates low volume of air;
Described metering valve is closed in response to detected volume of air indicates low volume of air; And
By-pass valve is opened to be discharged from described storage by reducing agent in response to the described pump of stopping and the described metering valve of closedown.
19. methods as claimed in claim 18, are also included in after reducing agent is discharged from described storage and close described by-pass valve.
20. methods as claimed in claim 19, also comprise:
Described metering valve is opened after reducing agent is discharged from described storage;
After reducing agent is discharged from described storage, by described metering valve with described bleed pressure supply air extremely described storage, until the air pressure in storage reaches described bleed pressure;
Air pressure in described storage closes described metering valve after reaching described bleed pressure; And
After described storage reaches described bleed pressure and described metering valve is closed, from described pump, reducing agent is pumped into described storage.
CN201480021315.2A 2013-03-15 2014-02-17 Air in the holder of transport system is re-introduced into Active CN105143618B (en)

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