CN105484833A - Liquid jet measurement unit and control method - Google Patents

Liquid jet measurement unit and control method Download PDF

Info

Publication number
CN105484833A
CN105484833A CN201410481651.7A CN201410481651A CN105484833A CN 105484833 A CN105484833 A CN 105484833A CN 201410481651 A CN201410481651 A CN 201410481651A CN 105484833 A CN105484833 A CN 105484833A
Authority
CN
China
Prior art keywords
liquid
batching unit
inject
piping arrangement
spiral piping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201410481651.7A
Other languages
Chinese (zh)
Other versions
CN105484833B (en
Inventor
郗大光
杨延相
张平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Fai Electronics Co Ltd
Original Assignee
Zhejiang Fai Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang Fai Electronics Co Ltd filed Critical Zhejiang Fai Electronics Co Ltd
Priority to CN201410481651.7A priority Critical patent/CN105484833B/en
Priority to PCT/CN2015/076020 priority patent/WO2016041339A1/en
Priority to DE112015004242.3T priority patent/DE112015004242T5/en
Publication of CN105484833A publication Critical patent/CN105484833A/en
Application granted granted Critical
Publication of CN105484833B publication Critical patent/CN105484833B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/02—Pumps peculiar thereto
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/04—Pumps peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • 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
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • 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

Landscapes

  • 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)
  • Magnetically Actuated Valves (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)

Abstract

The invention provides a liquid jet measurement unit and a control method. The liquid jet measurement unit comprises a jet unit and a measurement controller. The jet unit comprises a solenoid device, a plunger pump and a nozzle; the solenoid device comprises coils, a magnet yoke and a magnetic resistor; the plunger pump comprises a plunger and a sleeve, the plunger and the sleeve are matched for forming a pressure feed cavity, and the pressure feed cavity is connected to a liquid inlet valve and a liquid outlet valve. The measurement controller provides drive signals for the solenoid device, comprises a monitoring device capable of monitoring the state parameters of the solenoid device, comprises the algorithm predicting the effective output work of the solenoid device through the state parameters and comprises the method for carrying out closed-loop control over the flow of the liquid jet measurement unit with the effective output work of the solenoid device as the variable, wherein the effective output work of the solenoid device is the energy needed for directly pressurizing liquid in the pressure feed cavity and forming jets. The liquid jet measurement unit and the control method have the advantages that the application range is wide and the control accuracy is high.

Description

A kind of Liquid inject batching unit and controlling method
Technical field
The invention belongs to liquid meter technical field, especially relevant with motor Liquid inject measurment technique, be specifically related to fuel-injection device for engine, engine tail gas purification NOx selective catalytic reduction (SCR) system, and the fuel oil of diesel engine exhaust particulate matter filter collector (DPF) sprays regenerative system and control technique thereof.
Background technique
Liquid inject metering is widely used in fields such as chemical industry, medical treatment and dynamic power machines, particularly relates to the multinomial core technology of combustion power.
Along with becoming increasingly conspicuous of environmental problem, energy-saving and emission-reduction have become the of paramount importance theme of Engine Industry, world many countries all constantly releases a series of motor and vehicular emission standards, to this, be that the vehicle of power needs better Combustion System with internal-combustion engine, and discharge post-treatment system be installed in the hope of meeting more and more stricter emission request.Such as, the motor comprising spark ignition type mini engine also adopts electronic fuel injection technology and exhaust three-element catalytic treatment technology as motor car engine; The direct spray petrol engine in cylinder of diesel engine or lean combustion, for reducing the noxious pollutant in tail gas, for NOx pollutant, adopt NOx Selective catalytic reduction (SCR=SelectiveCatalyticReduction) technology can carrying out catalytic reduction process under oxygen-enriched environment; Granular material discharged for diesel engine, adopts diesel particulate filtration catcher (DPF=DieselParticulateFilter) technology etc.
All these technology, all relate to the injection metering control problem of liquid, to gasoline injection technology, need to spray metering and feedback control gasoline injection amount; To dpf regeneration technology, need to spray metering and be atomized in DPF upstream exhaust pipe the diesel oil amount sprayed into; And to SCR technology, need in the metered injection NOx selective reduction agent of SCR catalyst upstream, the aqueous solution of urea (be also diesel exhaust gas treatment fluid DEF=DieselExhaustFluid, or add blue liquid AdBlue) of such as 32.5% weight concentration.
After DEF enters engine exhaust pipe, resolve into ammonia by exhaust high temperature, after mixing with exhaust, enter SCR catalytic converter.Under the effect of catalyzer, will there is catalytic reduction reaction with the NOx etc. in engine exhaust in ammonia, make NOx be decomposed into harmless N2, H2O.If DEF emitted dose does not match with the NOx content in exhaust, so or NOx can not be reduced sufficiently decomposition, discharge amount increases, or remaining many ammonias is discharged in air, causes secondary pollution.Therefore the SCR system SCR metering jetting device that precision must be needed higher.
Metering system is sprayed for SCR, because aqueous solution of urea has electric conductivity, traditional injection metering system that is power source with DC rotation electric pump can not slip into and work in working liquid body, therefore most prior art adopts with the external diaphragm pump of DC motor Driver as power source, the complex structure of this system, except reliability, the impact also by environment is larger, especially the ice-melt auxiliary device of need of work complexity at low ambient temperatures, after sales service is safeguarded also more difficult.
In engine art, measure relevant concrete technology to Liquid inject to include but not limited to: the electronic fuel injection system, comprise in-cylinder direct injection (GDI) and cylinder sprays (MPI) outward, engine tail gas purification nitrogen oxides selective catalytic reduction (SCR) aqueous solution of urea ejecting system, exhaust emissions of diesel engine particulate matter filters (DPF) regeneration fuel oil ejecting system.
Adopt plunger-tube-in-tube structure, US Patent No. 20090301067A1 discloses a kind of DEF and sprays measuring apparatus, wherein metering jetting device is the plunger pump nozzle of a solenoid-activated, be arranged on outlet pipe, need an additional low pressure pump to provide working liquid body for it from DEF liquid container, and need to take cooling method normally to work.
Dpf regeneration combustion oil injection, obtain with minimum fuel consume the object that the highest dpf temperature reaches the particulate matters such as the soot burning collection in order to improve combustion efficiency, the diesel oil of injection must be atomized well.But prior art majority adopts the spraying technique of low pressure.Such as, the disclosed technological scheme of U. S. Patent (publication number: US2007/0033927) has used basic principle and the structure metering fuel oil of gasoline port ejecting system, and jet pressure is relatively low.
On the whole, the injection measurment technique of being correlated with from motor can be divided into three kinds of different types: mouth end controls, and pump end controls and mouth-pump end Hybrid mode.Wherein, mouth end controls to be widely used in fuel oil tuned port injection system, and mouth-pump Hybrid mode is widely used in direct injection system in oil-burning cylinder, and pump end controls to be applied to that internal combustion oil of cylinder directly sprays, Single Cylinder Gasoline Engine fuel oil sprays and SCR system etc.
Prior art is difficult to applying above unified on the final controlling element and method of measurement of a type.The reason of one of them essence is: the rotary low-pressure petrol pump generally applied can not process conducting medium, as aqueous solution of urea etc.And although another solenoid plunger pump can process conduction, non-electrically conductive liquid, there is the problem of accurate measurement difficulty.
Solenoid plunger pump can be subdivided into two kinds of different structures, and a kind of is the plunger-sleeve pump of plunger motion, and another kind is the sleeve-plunger pump of sleeve motion.About the plunger-sleeve pump for force feed fuel oil, U. S. Patent 20030155444A1 discloses a kind of measurement control method, that is, by predicting that the method for fuel injection amount is predicted in the position of plunger.But due to fuel oil, especially vapour oil volatility is very strong, and the fluid entered in plunger bushing can comprise certain steam or air usually, and the emitted dose of fuel oil and the position of plunger not exist relation one to one.In addition, the displacement of prediction plunger is difficult as prediction fuel injection amount, can there is certain difficulty on the implementation.
Therefore about solenoid plunger pump, no matter be plunger-sleeve pump or sleeve-plunger pump, propose succinct structure and the application mode that can meet multiple target, and unified method of measurement be a very valuable job simultaneously.
Summary of the invention
The present invention is directed to the problems referred to above, object be to be to provide and can realize that pump end controls, highly versatile and final controlling element scheme simple for structure and unified control method of measurement.These technological schemes and controlling method can be widely used in the design of the liquid injection system in diesel oil or petrol engine tail gas clean-up SCR and DPF system, the design of SI engine fuel injection system, comprising suction port and in-cylinder direct injection two kinds of systems.
For achieving the above object, the present invention takes following technological scheme, namely, a kind of Liquid inject batching unit and controlling method, it is characterized in that, comprise an injection unit and a measurement controller, described injection unit comprises a spiral piping arrangement, a plunger pump and a nozzle, described spiral piping arrangement comprises coil, yoke, magnetic resistance and armature, wherein yoke and armature are made up of permeability magnetic material, magnetic resistance is made up of non-magnet material, described plunger pump comprises plunger and sleeve, plunger coordinates with sleeve and forms force feed volume, force feed volume connects liquid feed valve and liquid valve, liquid enters force feed volume from liquid feed valve and exports from liquid valve, described measurement controller provides drive singal for spiral piping arrangement, measurement controller comprises the monitoring device that can be monitored spiral piping arrangement status parameter, comprise the algorithm of the effective output work of utilization state parameter prediction spiral piping arrangement, comprise with the effective output work of spiral piping arrangement for variable to carry out the method for closed loop control to the flow of Liquid inject batching unit.The effective output work of described spiral piping arrangement refers to and directly also forms the energy required for spraying to the liquid pressing in force feed volume.
For the control of spiral piping arrangement, modal method is the mode taking PWM simply to drive, this mode does not carry out feedback modifiers to solenoidal execution result, the inconsistent of target and result can be produced, often can not cover completely because the factors such as the change (such as occurring two phase flow etc.) of liquid condition, the change of driving voltage and the change of solenoid resistance are on the impact of execution result.
Spray batching unit for aforesaid liquid, a kind of selectable scheme is sleeve-plunger pump structure, that is, comprise a return spring, sleeve to-and-fro motion under the driving of spiral piping arrangement and return spring, causes the alternately change of force feed volume size.
Spray batching unit for aforesaid liquid, another kind of selectable scheme is plunger-sleeve pump structure, that is, comprise a return spring, plunger to-and-fro motion under the driving of spiral piping arrangement and return spring, causes the alternately change of force feed volume size.
For plunger-sleeve pump structure, the scheme of further refinement is: plunger comprises an armature, and armature is roughly a cylindrical body, and armature comprises the through hole of through both ends of the surface.Described through hole can have certain tapering, and the hole of band tapering, to feeding liquid under pressure Directional Extension, for realizing the directional flow of liquid in inner space, being sprayed batching unit with cooling liquid and improving the stability of its work.
Return spring in such scheme can replace by another one spiral piping arrangement to provide the power required for sleeve or plunger return.
In such scheme, can comprise a high-voltage tube between tapping channel and nozzle, described high-voltage tube is made up of metal or macromolecular material, and can be the rigid pipe of sizing, also can be flexible flexible pipe.In addition, the liquid from liquid tank needs the inner space that just can enter Liquid inject batching unit through a filter.
A kind of selectable scheme is: comprise a gas-liquid mixed chamber, first liquid spray in gas-liquid mixed chamber by nozzle, sprays in waste pipe after liquid and gas and vapor permeation through a sparger again.Described sparger can be a simple throttling hole type nozzle, also can be a swirl nozzle not containing nozzle group valve.This scheme is for different application, following different target can be realized: one is the content being conducive to the atomization of liquid and increasing outlet pipe oxygen, two is to avoid liquid to freeze to the blocking of delivery line and damage, three is to avoid solvent such as jetting fluid such as the crystalline solid of aqueous solution of urea after moisture evaporation to separate out blocking to pipeline, and four is to avoid coking composition in liquid to the blocking of nozzle.
For such scheme, when motor does not need atomizing of liquids, pressurized gas continue air feed with cleaning from vapour-liquid mixing chamber to sparger residual liquid.
Another ejection schemes being applied to engine exhaust after-treatment system is: liquid is directly sprayed in engine exhaust pipe by nozzle by high-voltage tube.If the liquid sprayed is DEF, except for reduce NOx emission need spray DEF except, can also spray in addition a small amount of DEF with prevent nozzle overheated or blocking.In order to prevent high-voltage tube from freezing, need to arrange ice-melting device along high-voltage tube, such as, carry out ice-melt by the mode of electric heating or engine cooling water heating.
By the effective output work of method prediction spiral piping arrangement of energy balance, need the total energy estimating that measurement controller exports, estimation solenoid resistance power consumption, estimation spiral piping arrangement inductive energy storage.Like this, total energy-solenoid resistance power consumption-spiral piping arrangement inductive energy storage-flow resistance power consumption-return spring energy storage that solenoidal effective output work=measurement controller exports.
The status parameter of described spiral piping arrangement may be selected to be: by the electric current of coil and the voltage at coil two ends.
Particularly, with the electric current of monitored coil and the product of voltage, measurement controller is approached to time integral and export total energy, square with the product of solenoid resistance, coil resistance power consumption is approached to time integral with the electric current of monitored coil, calculate spiral piping arrangement inductive energy storage with the solenoid current of monitoring.About the flow resistance power consumption of liquid and the energy storage of return spring, can be treated to simply: linear with emitted dose after injection beginning.Above-mentioned energy balance relations, can express with following mathematical way:
If,
The emitted dose of Q-liquid;
Wn is effective output work of spiral piping arrangement;
The total energy that Et inputs spiral piping arrangement, Et0 is by Et corresponding to injection beginning;
Er is coil resistance energy consumption, and Er0 is by Er corresponding to injection beginning;
Ein is the inductive energy storage of current spiral piping arrangement, Ein corresponding when Ein0 is injection beginning;
Wr is fluid resistance power consumption, and Wr0 is by Wr corresponding to injection beginning;
Es is the energy storage of return spring, and Es0 is the energy storage of return spring when starting to spray, the energy pre-storage of return spring when Esi is coil energization.
So,
Wn=η Q, η are the scaling factor between effective output work and emitted dose,
Wn=Et-Er-Ein-Wr-（Es-Esi），
Et0=Er0+Ein0+Wr0+（Es0-Esi），
Or, Wn=(Et-Et0)-(Er-Er0)-(Ein-Ein0)-(Wr-Wr0)-(Es-Es0),
Every concrete representation is:
Et=int(Id·Vd),
Er=int (Id 2r), r is the resistance of coil,
Ein=LId 2/ 2, L is the inductance of spiral piping arrangement,
Es=KX 2/ 2, K is the elasticity coefficient of return spring, and X is the decrement of spring,
(Wr-Wr0)=ζ Q, ζ is a scaling factor,
Above, int represents the integration to the time after coil electricity;
Therefore,
Q=[（Et-Et0）-(Er-Er0)-(Ein-Ein0)-（Es-Es0）]/α，α=η+ζ。
Every the comprised variable in the right of above-mentioned formula is can the status parameter of spiral piping arrangement of Real-Time Monitoring: Id, Vd, constant: r, K, L, and undetermined coefficient α.Wherein, α can be demarcated by the actual measurement of flow, if above-mentioned physical relation is more complete, α should be a constant; L by theory calculate or can be considered as undetermined coefficient, is demarcated by the actual measurement of multi-point flux.
According to practice, it is also rational for being treated to proportional with Q by the energy storage (Es-Es0) of return spring, like this about emitted dose formula just aobvious containing return spring energy storage this.
Further, Er-Er0 and Ein-Ein0 can be treated to respectively or simultaneously simply and be directly proportional to emitted dose Q, the expression of such emitted dose can greatly simplify, that is,
Q=(Et-Et0)/μ, μ is a undetermined coefficient, demarcates by flow measurement.This simplified model is equivalent to carry out matching injection flow with the product of electric current and voltage to time integral.
Above, about the fluid resistance power consumption of liquid, the model of further refinement also can be adopted to approach, such as, square being directly proportional of resistance and relative velocity, involved undetermined coefficient can be demarcated by the multi-point flux test of Liquid inject batching unit.
US Patent No. 7273038B2 discloses a kind of method more simplified, the integration matching injection flow of direct employing Current versus time, here do not consider the factor of mains voltage variations, especially the transient wave of voltage is for the impact of the effective output work of spiral piping arrangement.
Another selection is: electromotive force after coil blackout is dropped to the time T3 required for reference voltage, be defined as spiral piping arrangement status parameter, the effective output work of spiral piping arrangement and T3 have good corresponding relation, and a kind of corresponding relation of simplification is that T3 and the effective output work of solenoid are treated to linear relationship.
If be control objectives by the fluid flow ejected in the unit time, a kind of selectable control mode is: keep the emitted dose of Liquid inject batching unit monopulse constant, namely fixing the effective output work of every impulse solenoid device, carrying out realize target by changing Liquid inject batching unit frequency of okperation.Another kind of control mode is: keep Liquid inject batching unit frequency of okperation constant, by changing the mode realize target of the effective output work of spiral piping arrangement.Also can adopt the mode that both combine, namely realize described target by the mode of the frequency of okperation and the effective output work of spiral piping arrangement that change Liquid inject batching unit.
Comprise a kind of method measuring liquid level in liquid container: measure liquid level, by measuring liquid, indirect inspection is carried out to the fluid resistance of plunger pump movement parts.The resistance of liquid can be obtained by the feature detecting above-mentioned solenoid status parameter.
Liquid inject batching unit provided by the invention and controlling method thereof, can apply but be not limited to following three aspects, namely, the fuel oil of engine management system sprays measuring apparatus, the aqueous solution of urea of After-treatment technics SCR system sprays measuring apparatus, and the initiative regeneration fuel of After-treatment technics DPF system sprays measuring apparatus.Other application also has, motor fuel additive quantitative injection mixing arrangement, engine cold-starting auxiliary combustion injection apparatus etc.
The plunger pump of the present invention both can be placed in liquid tank inside, also can be placed in the outside of liquid tank.For SCR ejecting system, when plunger pump being placed in liquid tank inside, device needed for ice thawing in winter can be reduced.When Liquid inject batching unit being placed in liquid tank outside, described filtration dress device can be integrated with Liquid inject batching unit, liquid can arrive filter by liquid feeding pipeline by gravity or additional low pressure pump bottom liquid tank, then enter Liquid inject batching unit, liquid return hole can arrive the top of liquid tank by external liquid return pipe.
For the various schemes of aforesaid liquid injection unit and controlling method, a kind of practical application scheme is: a kind of metering module, and comprise a support be made up of ice-melt pipe, injection unit is fixed on one end of support, and controller is fixed on the other end of support.This scheme is particularly suitable for the ejecting system forming SCR aqueous solution of urea, can be vertical or be placed horizontally in liquid tank by described metering module, wherein one end of static controller is fixed on liquid tank, controller exposes to liquid tank, and one end of fixing injection unit is positioned at the bottom of liquid tank.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the building-block of logic of the Liquid inject batching unit containing sleeve-plunger pump provided by the invention.
Fig. 2 is the building-block of logic of the Liquid inject batching unit containing plunger-sleeve pump provided by the invention.
Fig. 3 a is the embodiment of the Liquid inject batching unit containing sleeve-plunger pump provided by the invention.
Fig. 3 b is the embodiment of the Liquid inject batching unit containing plunger-sleeve pump provided by the invention.
The spiral piping arrangement status parameter principle of measurement figure of Fig. 4 Liquid inject batching unit provided by the invention.
The spiral piping arrangement status parameter tension measuring circuit of Fig. 5 a Liquid inject batching unit provided by the invention.
The spiral piping arrangement status parameter current measurement circuit of Fig. 5 b Liquid inject batching unit provided by the invention.
Fig. 6 is the flow active closed-loop control logic figure of Liquid inject batching unit provided by the invention.
The physical definition figure of the spiral piping arrangement status parameter T3 of Fig. 7 a Liquid inject batching unit provided by the invention.
The measuring circuit figure of the spiral piping arrangement status parameter T3 of Fig. 7 b Liquid inject batching unit provided by the invention.
Fig. 8 is the passive closed loop control logic figure of flow of Liquid inject batching unit provided by the invention.
Fig. 9 a is to one of the prediction of flow group of measured data based on the first energy model.
Fig. 9 b is to one of the prediction of flow group of measured data based on the second energy model.
Fig. 9 c is to one of the prediction of flow group of measured data based on the 3rd energy model.
Fig. 9 d is to one of the prediction of flow group of measured data based on the 4th energy model.
Figure 10 is the example that Liquid inject batching unit provided by the invention is applied to engine electric spray system.
Figure 11 is the example that Liquid inject batching unit provided by the invention is applied to SCR system.
Figure 12 is the example that Liquid inject batching unit provided by the invention is applied to dpf regeneration system.
Specific embodiment
As shown in Figure 1, the building-block of logic of the Liquid inject batching unit containing sleeve-plunger pump provided by the invention, comprises, plunger pump 8, spiral piping arrangement 18, controller 13, nozzle 23, return spring 10.Wherein, plunger pump device 8 comprises sleeve 11, plunger 12, liquid feed valve 16 and liquid valve 17, and sleeve 11 and plunger 12 close fit, form force feed volume 9.Spiral piping arrangement 18 comprises coil 19, yoke 20, magnetic gap 21 and armature 12a.Described armature 12a and sleeve 11 can be integrated design, sleeve 11 is enclosed in wherein by armature 12a, described yoke 20 is made up of permeability magnetic material with armature 12a, the front-end face of armature 12a is positioned near magnetic gap 21, after coil 19 is energized, armature 12a together with sleeve 11 under the driving of spiral piping arrangement 18, forward movement causes force feed volume 9 to reduce, after liquid in force feed volume 9 is squeezed, pressure raises, cause liquid valve 17 to be opened, liquid arrives nozzle 23, under pressure, nozzle 23 is opened, and Liquid inject is gone out; After coil 19 energising terminates, under the effect of return spring 10, sleeve 11 starts returning movement, and in return process, liquid feed valve 16 is opened, and new liquid enters force feed space 9, prepares the injection of next circulation.
As shown in Figure 2, the building-block of logic of the Liquid inject batching unit containing plunger-sleeve pump provided by the invention, comprises, plunger pump 8, spiral piping arrangement 18, controller 13, nozzle 23, return spring 10.Wherein, plunger pump device 8 comprises sleeve 11, plunger 12, liquid feed valve 16 and liquid valve 17, and plunger 12 and sleeve 11 close fit, form force feed volume 9.Spiral piping arrangement 18 comprises coil 19, yoke 20, magnetic gap 21 and armature 12a.Armature 12a arranges with the coaxial tandem of plunger 12, described yoke 20 is made up of permeability magnetic material with armature 12a, and the front-end face of armature 12a is positioned near magnetic gap 21, after coil 19 is energized, armature 12a together with plunger 12 under the driving of spiral piping arrangement 18, forward movement causes force feed volume 9 to reduce, and after the liquid in force feed volume 9 is squeezed, pressure raises, and causes liquid valve 17 to be opened, liquid arrives nozzle 23, under pressure, nozzle 23 is opened, and Liquid inject is gone out; After coil 19 energising terminates, under the effect of return spring 10, plunger 12 starts returning movement, and in return process, liquid feed valve 16 is opened, and new liquid enters force feed space 9, prepares the injection of next circulation.
In the Liquid inject batching unit scheme that Fig. 1 and Fig. 2 provides, liquid valve 17 is the one-way valves by differential pressure control switch, liquid feed valve 16 can be the one-way valve by differential pressure control switch, also can be by the guiding valve of sleeve-plunger relative position control switch, or a combination by the one-way valve of differential pressure control switch and the guiding valve by sleeve-plunger relative position control switch.
As shown in Figure 3 a, one of Liquid inject batching unit containing sleeve-plunger pump provided by the invention specific embodiment, comprises spiral piping arrangement 18, plunger pump 8, return spring 10, pump end 26, high-voltage tube 25, nozzle 23, filter 31, low pressure volume 29 and output terminal housing 37.
Spiral piping arrangement 18 comprises coil 19, the first inner yoke 20a, the second inner yoke 20d, outside yoke 20b, outside yoke end 20c, magnetic gap 21 and armature 12a.Outside yoke 20b is locked by the plastic deformation of protruding 20b1 and outside magnetic end 20c, while coil 19 be also fixed on wherein, the first inner yoke 20a comprises an exhaust gas inside road 28 by fluid.Outside yoke 20b, outside yoke end 20c, the first inner yoke 20a and the second inner yoke 20d make by permeability magnetic material, and magnetic gap 21 is non-magnet material.Armature 12a has several straight trough 12e circumferentially distributed, to reduce reciprocating resistance.
Plunger pump 8 comprises sleeve 11, plunger 12, liquid feed valve 16 and liquid valve 17.Sleeve 11 and plunger 12 close fit, form force feed volume 9.Described sleeve 11 can be designed to one with armature 12a, and adopts identical or different materials, and sleeve 11 is positioned at inside armature 12a, comprises plunger hole 27, overflow hole 16b1, liquid inlet channel 30.Plunger 12 comprises an end face 16b2, a tapping channel 12d, a metering hole 12b being positioned at tapping channel 12d downstream, a protruding 12c being positioned at end.Liquid feed valve 16 be one by one-way valve 16a and the combination brake switch and proporting that guiding valve 16b is formed.Described one-way valve 16a is made up of valve member 16a1, valve spring 16a2 and valve seat 16a3, and valve seat 16a3 can be connected as a single entity with sleeve 11, is one and is positioned at liquid inlet channel 30 place and the conical seat surface be communicated with it.Described guiding valve 16b comprises the end face 16b2 of overflow hole 16b1 and plunger 12.The opening and closing of guiding valve 16b is determined by the relative position of plunger 12, closes when plunger 12 moves to guiding valve 16b when end face 16b2 exceedes overflow hole 12b peak.If the closedown of described one-way valve 16a is later than the moment that overflow hole 16b1 is blocked, the process starting force feed liquid depends on the closedown of one-way valve 16a, otherwise the process starting force feed liquid depends on blocking of overflow hole 16b1.Described liquid valve 17 is an one-way valve, comprises fluid valve member 17a, fluid valve spring 17b and fluid valve seat 17c.Fluid valve seat 17c is fixed on plunger 12, fixes and can adopt the mode such as close-fitting or welding.
Pump end 26 comprises a pump end liquid entering hole 26c, a strut 26a and bounding means 26b, liquid inlet channel 30 allows strut 26a to stretch into and touches unidirectional valve member 16a1, bounding means 26b is for limiting armature 12a return, leave in a segment distance of pump end 26 at armature 12a, strut 26a keeps contacting with unidirectional valve member 16a1 and stoping it to take a seat, such one side can when armature 12a be returned to initial position, one-way valve 16a is held open state, liquid is made to have the more sufficient time to enter force feed volume 9, on the other hand, in the segment distance that armature 12a leaves pump end 26 forward movement, gas in force feed volume 9 can continue through one-way valve 16a and discharge, thus ensure that the measuring accuracy of liquid.
Nozzle 23 is a ball-valve type nozzle, comprise valve seat 38 before nozzle, hemisphere valve member 40, nozzle rear valve base 41, nozzle group valve spring 42, spray orifice 39, before nozzle valve seat 38 comprise can with the conical seat surface of the ball face sealing of hemisphere valve member 40, nozzle rear valve base 41 comprises one can form the plane of sealing with the plane of hemisphere valve seat 43, before nozzle, valve seat 38 and nozzle rear valve base 41 are by being welded to connect, leave wherein after connection and open required space for hemisphere valve member 40, be provided with filter screen 44 in the ingress of ball-valve type nozzle 23.
High-voltage tube 25 comprises the rapid pipe joint 25a docked with the lug bosses at end part 12c of the plunger 12 and rapid pipe joint 25b docked with the lug bosses at end part 23a of nozzle 23.The pump housing 1 and high-voltage tube 25 enclose 32 by o and seal, and nozzle 23 and high-voltage tube 25 enclose 33 by o and seal.
Filter 30 comprises inner skeleton 34, filter net cloth 35, filter inner chamber 36.
The working procedure of described liquid ejection unit is as follows:
At motion initial position, because the effect of return spring 10 and bounding means 26b are close to, now one-way valve 16a is in opening state due to strut 26a effect, and overflow hole 16b1 and force feed volume 9 are in connected state, contained gas componant easily escape force feed volume 9, is full of liquid in force feed volume 9.When starting to travel forward together with sleeve 11 under the effect of armature 12a in electromagnetic force, the segment fluid flow in force feed volume 9 is discharged, comprising portion gas by liquid inlet channel 30 and overflow hole 16b1.When after armature 12a motion certain distance, overflow hole 16b1 is blocked by the surface of plunger 12.Armature 12a continues motion, and force feed volume 16 constantly reduces, and when the ball surface of unidirectional valve member 16a1 is seated at conical valve seat 16a3, feed liquor one-way valve 16a closes, and force feed process starts.Fluid pressure in force feed volume 9 raises gradually, when the pressure acting on liquid valve part 17a can overcome the active force of fluid check valve spring 17b, fluid one-way valve 17 is opened, liquid enters tapping channel 12d, high-voltage tube 25 is entered through metering hole 12b, hemisphere valve member 40 is arrived by filter screen 44, when the front and back pressure reduction of hemisphere valve member 40 is elevated to the active force that can overcome nozzle group valve spring 42, before hemisphere valve member 40 leaves nozzle valve seat 38 sealing cone and be adjacent to the sealing plane of nozzle rear valve base 41, at this moment liquid is sprayed by spray orifice 39.
After acting on the disappearance of the electromagnetic force on armature 12a, under the effect of return spring 10, armature 12a starts return-stroke, now because of the expansion of force feed volume 9 cause pressure drop then fluid one-way valve 17 close, one-way valve 16a opens, liquid enters rapidly force feed volume 9 under the effect of pressure reduction, after armature 12a continues the certain stroke of motion, first be that the motion of feed liquor valve member 16a1 is stopped by strut 26a, next be that overflow hole 16b1 is communicated with again with force feed volume 9, partially liq also can enter force feed volume 9 from overflow hole 16b1, continuation return limited 26b of armature 12a stops and stops, this end that circulates.
In above process, also can redesign overflow hole 16b1, to such an extent as to the close moment of the closedown of overflow hole 16b1 and liquid feed valve 16a order is put upside down mutually.
In above-mentioned working procedure, liquid enters whole armature space 12d from filter inner chamber 36 by pump end liquid inlet channel 26c, and enter force feed volume 16 by liquid inlet channel 14, because the dissipation of electric energy is generated heat, partially liq is caused to evaporate in armature space 12d, the steam evaporated enters low pressure volume 29 from exhaust gas inside road 28, and is excreted by the exhaust bubble mouth 29a be positioned on output terminal housing 37.Described exhaust bubble mouth 29a comprises an installation step 29b, can be used for installing exhaust gas bubble pipe, makes the more effective discharge pump housing of gas.
Shown in Fig. 3 b, another specific embodiment of Liquid inject batching unit containing plunger-sleeve pump provided by the invention, be with the main distinction of Fig. 3 embodiment that a provides: the present embodiment Liquid inject batching unit 1 have employed plunger 12 and is synchronized with the movement with armature 12a, and the fixed structure of sleeve 11.Armature 12a is roughly a cylindrical body, comprises the through hole 45 of through both ends of the surface.Described through hole 45 can have certain tapering, and the hole of band tapering, to feeding liquid under pressure Directional Extension, to realize the directional flow of liquid in inner space, is sprayed batching unit 1 with cooling liquid and improves the stability of its work.
Described armature 12a and plunger 12 can be an entirety, also can carry out Movement transmit by link 12b.Sleeve 11 is coaxially fixed on output terminal housing 37, and the overflow hole 16b1 that sleeve 11 is provided with side direction is communicated with axial straight consent 27.Plunger 12 snug sliding fit is contained in sleeve 11, and its top is contacted with armature 12a all the time by link 12b.Overflow hole 16b1 and plunger end face 16b2 forms liquid feed valve 16.Liquid valve 17 is made up of fluid valve member 17a, fluid valve spring 17b and fluid valve seat 17c, and fluid valve seat 17c is the conical surface coordinated with fluid valve member 17a, is positioned at sleeve 11 end 11a place.Between return spring 10 is arranged on bottom plunger 12 and armature space 12d.
The liquid entered by liquid entering hole 46 enters force feed volume 9 by overflow hole 16b1, when the powered magneto drive of armature 12a is descending, promote plunger 12 by link 12b descending, blocked by the wall of plunger 12 once inhale overflow hole 16b1, liquid feed valve 16 is closed, force feed stroke starts, and in force feed volume 9, fluid pressure raises, and then opens liquid valve 17, pressured fluid enters liquid outlet 47 and high-voltage tube 25, and arrive nozzle 23, once pressure exceedes the cracking pressure of nozzle 23, nozzle is outside jetting fluid mist just.Described nozzle 23 can be a poppet valve relying on opened by pressure.
In the process, the liquid entered by liquid entering hole 46, together with bubble wherein, can be arranged bubble channel by exhaust bubble mouth 28(and allow liquid to pass through equally) armature space 12d and through hole 45 directly enter exhaust bubble mouth 29a, and form back liquid stream and take away heat.
Be illustrated in figure 4 the principle of measurement figure of the spiral piping arrangement status parameter of Liquid inject batching unit provided by the invention, wherein, comprising a control master chip 13a is a single-chip microcomputer, the semiconductor switch pipe 13b of a control spiral piping arrangement 19, a circuit 13c measured by coil current, the circuit 13d of a measuring coil both end voltage, a T3 generative circuit 13e.
The physical circuit of the spiral piping arrangement status parameter voltage measurement of Fig. 5 a Liquid inject batching unit provided by the invention is the bleeder circuit of a common measuring voltage, comprising two resistance 102.
The spiral piping arrangement status parameter current measurement circuit of Fig. 5 b Liquid inject batching unit provided by the invention is a circuit measuring common measurement electric current, comprising an operational amplifier 101 and corresponding resistance 102.
As shown in Figure 6, the flow active closed-loop control logic of Liquid inject batching unit provided by the invention comprises the following steps:
Step 111, multi-point flux according to Liquid inject batching unit is tested, set up emitted dose Q and the effective output work Wn(of spiral piping arrangement hereinafter referred to as effective output work) between relation, it can be discrete data, also can be the relation according to discrete data fitting, α is also demarcated thereupon, is then stored in controller 13 by described data or relation;
Step 112, according to target injection amount Qo, determines target effective output work Wno;
Step 113, controller 13 by semiconductor switch pipe 13b to coil 19 making alive;
Step 114, gathers electric current I d and the voltage Vd of coil 19 according to certain time interval;
Step 115, selects a kind of method provided by the invention to calculate current effective output work Wnc;
Step 116, the effective output work Wno of comparison object and current effective output work Wnc;
Step 117, if Wno-Wnc is less than an a small amount of e allowed, then illustrate that achieving this sprays target, this drives end.Otherwise, continue to drive and get back to step 114 to continue Real-Time Monitoring.
As shown in Figure 7a, the physical definition of the spiral piping arrangement status parameter T3 of Liquid inject batching unit provided by the invention is, after coil 19 power-off, induction electromotive force at coil two ends can raise suddenly, then decline along curve 103, as voltage drop to reference voltage Vf, be defined as T3 from coil 19 power-off to the time lag of current time, single-chip microcomputer 13a can obtain concrete numerical value according to the measurement signal 104 of T3.
The measurement signal 104 of T3 can pass through a circuit evolving, as shown in Figure 7b, the measuring circuit of the spiral piping arrangement status parameter T3 of Liquid inject batching unit provided by the invention, wherein, reference voltage Vf is formed by electric resistance partial pressure by power source voltage Vcc, contrast Fig. 4, an input end of the signal access operational amplifier 101a of one end M of coil, Vd accesses another input end of same operational amplifier 101a, its output terminal of amplifier 101a accesses an input end of another operational amplifier 101b, and reference voltage Vf accesses another input end of operational amplifier 101b, like this, T3 signal can be detected at the output terminal of operational amplifier 101b, it is a square signal (as shown in Figure 7a).
Based on T3 signal, as shown in Figure 8, one can be designed and namely comprise the following steps for the passive closed loop control logic of the flow control of Liquid inject batching unit provided by the invention,
Step 121, multi-point flux according to Liquid inject batching unit is tested, and sets up the relation between emitted dose Q and T3, can be discrete data, also can be the relation according to discrete data fitting, then described data or relation are stored in advance in controller 13;
Step 122, T1=f(T3 by Liquid inject batching unit) relation is by simply testing acquisition, and the differential relationship of T3 and T1 is obtained according to these discrete datas, i.e. dT1=df(dT3), by these data or with discrete form, or matching forms function expression, relation, is stored in advance in controller 13;
Step 123, according to target injection amount Qo, determines target T3, i.e. T3o;
Step 124, the relation T1=f(T3 according to prestoring), estimate the driving pulsewidth T1 realizing T3o;
Step 125, according to the feedback information of a upper circulation, determines the dynamic corrections amount dT1 of T1;
Step 126, according to pulsewidth T1+dT1 drive coil 19;
Step 127, gathers the signal value of T3;
Step 126, calculates the difference between current T3 and target T3, i.e. dT3=T3o-T3;
Step 127, is pre-stored in the relation in controller 13 according to step 122, calculates the reduction value dT1=df (dT3) of T1
Get back to step 125, the information of dT1 is stored among controller 13.
Above for the passive type closed loop control of the emitted dose of described liquid ejection unit, although control objectives can not be realized accurately at current PRF in form, but because the interval time of adjacent two pulses is very short, the state change during this period of the fluid of liquid ejection unit itself and surrounding is negligible, therefore in fact can obtain higher control accuracy.
Fig. 9 a gives one group of measured data based on the first energy model and linear fit relation thereof, described first energy model refers to Wn=Et-Et0, namely have ignored the energy consumption of coil resistance, have ignored the inductive energy storage of spiral piping arrangement, have ignored liquid flowing resistance power consumption, and the factor such as the energy storage of return spring, the total energy differenceization directly will spiral piping arrangement inputted, namely, the total energy of current input with spray before the difference of total energy that inputs as effective output work process of spiral piping arrangement, the energy model of such simplification and emitted dose Q do not have good linear corresponding relation, but also there is certain practical significance, because it can eliminate the influence factor of some states because of injection unit change for emitted dose.
Fig. 9 b is to one of the prediction of flow group of measured data and linear fit relation thereof based on the second energy model, described second energy model is on the basis of the first energy model, add the influence factor of coil resistance energy consumption, that is: Wn=(Et-Et0)-(Er-Er0).Can find out, based on the prediction of the second energy model for emitted dose Q, relative first energy model makes moderate progress, but not remarkable.
Fig. 9 c is based on the 3rd energy model to one of the prediction of flow group of measured data, and described 3rd energy model is on the basis of the second energy model, increases again the influence factor of inductive energy storage, that is: Wn=(Et-Et0)-(Er-Er0)-(Ein-Ein0).Can find out, based on the prediction of the 3rd energy model for emitted dose Q, to there is very high validity.
Fig. 9 d is to one of the prediction of flow group of measured data and linear fit relation thereof based on the 4th energy model, described 4th energy model is that effective output work and T3 are associated as linear relationship, i.e. Wn=λ (T3-T30), wherein, T30 is the T3 of injection beginning when occurring, λ is one can test by flow measurement the undetermined coefficient determined.As can be seen from measured result, the 4th energy model can provide and predict the outcome preferably to emitted dose.
Figure 10 is the example that Liquid inject batching unit provided by the invention is applied to engine electric spray system, the Unit injector of the example given can be sleeve-plunger pump shown in Fig. 3 a, shown application scheme needs the sleeve-plunger pump shown in Fig. 3 a to be placed upside down, and is so more conducive to the removal of bubbles near liquid feed valve 16a.Example comprises fuel tank 132, plunger pump 8, high-pressure injection pipe 25, nozzle 23 and controller 13.Described fuel tank 132 comprises an installation base 132a, and plunger pump 8 is fixed on fuel tank mounting platform by bolt 131, and is sealed by sealing gasket 138.It is inner that filter 31 is positioned at fuel tank 132, and nozzle 23 is arranged on the air inlet tube 134 of motor 133 near air inlet valve position.Described controller 13 as the EFI controller of motor, drives Liquid inject batching unit 1 to work by cable 135 equally, and measures the gasoline sprayed by nozzle 23, enters in the cylinder 136 of motor 133 with air after mixing.Certain measurement controller 13 is also connected with other mechanisms of electrical control system for engine by cable 137, such as motor footmark sensor.
The batching unit of Liquid inject shown in this example can also be applied to the direct ejecting system of petrol engine internal combustion oil of cylinder.
Figure 11 is the example that Liquid inject batching unit provided by the invention is applied to SCR system, and the Unit injector of the example given can be sleeve-plunger pump shown in Fig. 3 a.Example comprises a urea tank 141, a support 142, a metered injection unit 1, a controller 13, mixing indusion tube 155, sparger 156, exhaust duct 157 with SCR catalytic converter 159, be furnished with temperature transducer 158 and NOx or ammonia gas sensor 160 along exhaust stream direction successively, lay respectively at catalyst 158 both sides.
Metered injection unit 1 comprises a plunger pump 8, high-voltage tube 25, nozzle 23 1 exhaust gas bubble pipes 145.Described exhaust gas bubble pipe 145 extends to solution top, and outlet end is provided with filter 146, to ensure that in plunger pump 8, cleaning solution is not contaminated, prevents foul from entering.
Support 142 comprises each sensor 144(and comprises temperature transducer, liquid level sensor etc.), plunger pump mounting platform 144a, for non-movable piston pump 8, circulating water heater 161 and the gas-liquid mixed chamber 148 being positioned at support 142 the other end and the controller 13 be installed on it.Described support 142 is installed on urea tank upper-end surface 141a, and it is inner that its one end is placed in urea tank 141 together with the plunger pump 8 be fixed on mounting platform 144a, and plunger pump 8 stretches to bottom urea tank 141.Described gas-liquid mixed chamber 148 comprises a suction tude joint 149 be communicated with intake duct 150, for introducing high-pressure air, a transfusion tube joint be communicated with tapping channel 151 147 and a nozzle install road 152, make the spray orifice 39 of nozzle 23 stretch into mixing chamber 148 inside by installing road 152, and sealed by support 142 fixing.
Described sparger 156 is installed on exhaust duct 157, can be a simple throttling hole type nozzle, also can be a swirl nozzle not containing nozzle group valve.This scheme is for different application, following different target can be realized: one is the content being conducive to the atomization of liquid and increasing outlet pipe oxygen, two is to avoid the icing blocking to delivery line and damage, three is that after moisture can be avoided to evaporate, the blocking to pipeline separated out by urea, and four is to avoid fuel oil coking to the blocking of nozzle.
The present invention give the working procedure of SCR system as follows.
The engine operating condition that measurement controller 13 is sent according to motor main control unit (not shown), and exhaust gas temperature sensor 159, NOx or ammonia gas sensor 160, the signal of each sensor 144 grade in liquid tank, calculate required urea solution flow, then judge whether urea solution ejecting system can normally work, if passable, just control Liquid inject batching unit 1 to work, the urea solution in liquid tank is pumped into high-voltage tube 25 and spurts into mixing chamber 148 by nozzle 23 again.Meanwhile, high-pressure air inputs mixing chamber 148 through pressure gauge 154, solenoid valve 153, suction tude joint 149 and intake duct 150 and mixes with wherein jetting fluid, an one-way valve can be installed between solenoid valve 153 and suction tude joint 149, make air-flow one-way trip.Mixed solution enters mixing indusion tube 155 by tapping channel 151 and transfusion tube joint 147.Finally, by sparger 156, mixed solution is entered in outlet pipe 157 with the injection of the form of atomization, urea solution pyrolysis under the effect of engine exhaust high temperature is ammonia, mixes enter SCR catalytic converter 159 with engine exhaust, and result NOx wherein will be harmless N by efficient-decomposition 2and H 2o, reaches the object of evolution tail gas.
In above-mentioned working procedure, controller 13 judges whether to have occurred that urea solution freezes according to the signal of temperature transducer in liquid tank 144, freeze if existed, then control water valve (not shown) and make the cooling water of motor enter circulating water heater 161 in liquid tank to heat ice-melt.
Figure 12 is the example that Liquid inject batching unit provided by the invention is applied to dpf regeneration system, and the Unit injector of the example given can be sleeve-plunger pump shown in Fig. 3 b.Example comprises a drop tank 173, plunger pump 8, high-voltage tube 25, nozzle 23, controller 13, outlet pipe 170, differential pressure pickup 180, temperature transducer 181.Described controller 13 can be one for receiving the metering module of main control unit working signal, also can be a control unit comprising DPF system.
In application example, outlet pipe 170 is provided with diesel particulate filter (DPF) 171, an oxidized form catalyst DOC179 can be connected before DPF, or direct noble metal-coating catalyzer on DPF filter, fuel oil (diesel oil) nozzle 23 of regeneration DPF171 is provided with in the upstream of DPF171, when regeneration condition reaches, quantitatively give in engine exhaust pipe 170 and spray into fuel oil, with air generation combustion reaction remaining in engine exhaust 172, the temperature of engine exhaust 172 is raised, enter DPF171, thus what collect in the DPF171 that ignites take soot as the particulate matter of Main Ingredients and Appearance, reach the object of regeneration DPF.The fuel oil sprayed into from nozzle 23 in native system should be the least possible, but engine exhaust 172 must be made to reach sufficiently high temperature, therefore requires that fuel-oil atmozation is good, and distribution rationally.Described nozzle 23 can select anti-coking and the strong lifting valve type structure of pollution capacity.Comprise a drop tank 173, drop tank 173 is arranged on Liquid inject batching unit 1 to such an extent as to the fuel oil of drop tank 173 can enter Liquid inject batching unit 1 by gravity forms normal fuel feeding.The oil return (preferably taking the form of connecting) of engine high pressure ejecting system enters drop tank 173 by filler opening 179, and then gets back to the main fuel tank of motor by return opening 178.The fuel oil of drop tank 173 also directly can come from engine high pressure ejecting system low pressure oil supply pump, or gets oil by the effect of carried wet (such as vacuum pump) or gravity from motor main fuel tank.At least one filtration system will be arranged, if from the low pressure oil return of engine high pressure ejecting system, then can not need separately to add filter, otherwise a fuel oil filter 31 can be arranged again from motor main fuel tank to Liquid inject batching unit 1.Described fuel tank 173 comprises an in-line 179 be connected with combustion system of diesel engine oil circuit (not shown) and an oil circuit 178 be connected with main fuel tank (not shown).The filler opening of plunger pump 8 imports spontaneous combustion drop tank 173 by oil inlet pipe 175 and fuel oil after filter 31 filters, under the control of controller 13, pump oil is to injection pipe 177, then spray into engine exhaust pipe 170 from nozzle 23, controller 13 is metered injection oil mass simultaneously, judge that whether sprayed oil mass is suitable according to detected engine operating condition, DPF pressure resistance, exhaust condition and dpf temperature (not shown) etc., and the need of continuation.The upper space of fuel tank 173 is got back in the oil return of plunger pump 8 by return tube 174.The liquid outlet 182 of drop tank 173 is positioned at bottom, and liquid return hole 177 is positioned at higher position, and fuel tank 173 still can normally be worked when oil reserve is few.
The working procedure of described application application system is as follows:
Soot from motor is also progressively accumulated wherein by DPF171 filtration, along with the increase of soot accumulation amount, pressure reduction △ P before and after DPF171 progressively increases, when by differential pressure pickup 180, controller 13 detects that △ P is greater than particular value (or the power stage of motor will be affected), and when detecting that temperature is greater than particular value by temperature transducer 181, when the oxygen gas component judged in engine exhaust pipe 172 by the throttle sensor signal of motor or other communication modes is again greater than particular value, controller 13 drives Liquid inject batching unit 1 by nozzle 23 to injected fuel in engine exhaust pipe 172, under guaranteeing to remove the prerequisite of the soot in DPF171 by oxidation, emitted dose is more few better.Emitted dose can be set in advance in the storage of controller 13, also can carry out feedback control according to sensors such as temperature, such as, can also increase a lambda sensor.
In application example shown in Figure 12, to the fuel feeding of the filler opening of plunger pump 8, also can for the addition of the diesel oil of combustion improver, such as, containing the diesel oil opening combustion catalyzer, in this case, fuel tank 173 is regeneration fuel oil specific store case.
In addition, fuel metering injection unit of the present invention, also may be used in situ quantitation and add fuel oil additive to fuel oil, such as inject fuel oil Portability catalyzer (FBC) to real-time and quantification in diesel engine main fuel, combustion temperature is opened with what reduce diesel particulate, or in DPF initiative regeneration fuel oil instant inject that combustion improver reduces that regeneration fuel oil and engine exhaust form mixed gas open combustion temperature, etc.
Above-mentioned example only for illustration of the present invention, but does not limit the present invention, and all further change schemes based on Spirit Essence of the present invention all belong to the scope that the present invention is open and protect.

Claims (18)

1. a Liquid inject batching unit and controlling method, it is characterized in that, comprise an injection unit and a measurement controller, described injection unit comprises a spiral piping arrangement, a plunger pump and a nozzle, described plunger pump comprises plunger and sleeve, plunger coordinates with sleeve and forms force feed volume, force feed volume connects liquid feed valve and liquid valve, liquid enters force feed volume from liquid feed valve and exports from liquid valve, described measurement controller provides drive singal for spiral piping arrangement, measurement controller comprises the monitoring device that can be monitored spiral piping arrangement status parameter, comprise the algorithm of the effective output work of utilization state parameter prediction spiral piping arrangement, comprise with the effective output work of spiral piping arrangement for variable to carry out the method for closed loop control to the flow of Liquid inject batching unit.
2. Liquid inject batching unit as claimed in claim 1 and controlling method, described plunger pump comprises a return spring, and sleeve to-and-fro motion under the driving of spiral piping arrangement and return spring, causes the alternately change of force feed volume size.
3. Liquid inject batching unit as claimed in claim 1 and controlling method, described plunger pump comprises a return spring, and plunger to-and-fro motion under the driving of spiral piping arrangement and return spring, causes the alternately change of force feed volume size.
4. Liquid inject batching unit as claimed in claim 3 and controlling method, described plunger comprises an armature, and described armature is roughly a cylindrical body, and armature comprises the through hole of through both ends of the surface.
5. the Liquid inject batching unit as described in claim 2 or 4 and controlling method, is characterized in that, comprises a high-voltage tube between liquid valve and nozzle.
6. Liquid inject batching unit as claimed in claim 5 and controlling method, it is characterized in that, comprise a gas-liquid mixed chamber, liquid sprays in gas-liquid mixed chamber by nozzle, again through a sparger ejection after liquid mixes with gas liquid.
7. Liquid inject batching unit as claimed in claim 6 and controlling method, it is characterized in that, described sparger is a swirl nozzle.
8. the Liquid inject batching unit as described in one of claim 1-7 item and controlling method, is characterized in that, the status parameter of described spiral piping arrangement comprises by solenoidal electric current and voltage.
9. Liquid inject batching unit as claimed in claim 8 and controlling method, it is characterized in that, the algorithm of the effective output work of prediction spiral piping arrangement comprises the step that estimation measurement controller exports total energy, the step of estimation solenoid resistance power consumption, the step of estimation spiral piping arrangement inductive energy storage.
10. Liquid inject batching unit as claimed in claim 9 and controlling method, is characterized in that, the step of estimation measurement controller output total energy comprises uses the product of solenoidal electric current and the voltage monitored to the step of time integral.
11. Liquid inject batching unit as claimed in claim 10 and controlling methods, is characterized in that, the step of estimation coil resistance power consumption comprise with the solenoidal electric current monitored square with the product of solenoid resistance to the step of time integral.
12. Liquid inject batching unit as claimed in claim 11 and controlling methods, is characterized in that, comprise the step calculating spiral piping arrangement inductive energy storage with the solenoid current of monitoring.
13. Liquid inject batching unit as claimed in claim 12 and controlling methods, is characterized in that, under the condition of Liquid inject, comprise and are treated to the emitted dose of liquid linear by the inductive energy storage of coil resistance power consumption and spiral piping arrangement respectively.
14. Liquid inject batching unit as described in one of claim 1-7 item and controlling method, it is characterized in that, after described spiral piping arrangement status parameter comprises coil blackout, electromotive force drops to the time T3 required for reference voltage, and the algorithm of the effective output work of prediction spiral piping arrangement comprises the step effective for spiral piping arrangement output work and T3 being processed into linear relationship.
15. Liquid inject batching unit as described in one of claim 1-14 item and controlling method, it is characterized in that, realize the flow targets sprayed in the described Liquid inject batching unit unit time, by keeping the effective output work of every impulse solenoid device constant, the frequency of okperation that regulates liquid sprays batching unit realizes.
16. Liquid inject batching unit as described in one of claim 1-14 item and controlling method, it is characterized in that, realize the flow targets sprayed in the described Liquid inject batching unit unit time, by keeping the frequency of okperation of Liquid inject batching unit constant, regulate the mode realize target of the effective output work of every impulse solenoid device.
17. Liquid inject batching unit as described in one of claim 1-14 item and controlling method, is characterized in that, comprises by measuring liquid to the fluid resistance of plunger pump movement parts, the method for prediction liquid level.
18. 1 kinds of metering modules, comprise the Liquid inject batching unit as described in one of claim 1-17 item and controlling method, it is characterized in that, comprise a support be made up of ice-melt pipe, injection unit is fixed on one end of support, and controller is fixed on the other end of support.
CN201410481651.7A 2014-09-19 2014-09-19 A kind of liquid injection metering units Active CN105484833B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201410481651.7A CN105484833B (en) 2014-09-19 2014-09-19 A kind of liquid injection metering units
PCT/CN2015/076020 WO2016041339A1 (en) 2014-09-19 2015-04-08 Liquid jet metering unit and control method
DE112015004242.3T DE112015004242T5 (en) 2014-09-19 2015-04-08 Liquid jet metering unit and its control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410481651.7A CN105484833B (en) 2014-09-19 2014-09-19 A kind of liquid injection metering units

Publications (2)

Publication Number Publication Date
CN105484833A true CN105484833A (en) 2016-04-13
CN105484833B CN105484833B (en) 2019-05-17

Family

ID=55532506

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410481651.7A Active CN105484833B (en) 2014-09-19 2014-09-19 A kind of liquid injection metering units

Country Status (3)

Country Link
CN (1) CN105484833B (en)
DE (1) DE112015004242T5 (en)
WO (1) WO2016041339A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112443440A (en) * 2019-09-02 2021-03-05 福爱电子(贵州)有限公司 Fuel injection unit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108798647A (en) * 2017-05-02 2018-11-13 中国石油化工股份有限公司 A kind of multi-function hole top of oil well gas-liquid metering device
US10634126B2 (en) * 2017-10-12 2020-04-28 Zhejiang Fai Electronics Co., Ltd. Constant-volume metering pump
CN113210146B (en) * 2021-05-31 2022-10-21 江西理工大学 Hydrocyclone with self-cleaning function

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4955347A (en) * 1988-04-12 1990-09-11 Honda Giken Kogyo Kabushiki Kaisha Fuel injector assembly for fuel-injected engine
DE10301653A1 (en) * 2002-01-18 2003-08-28 Denso Corp Fuel injection system for a multicylinder combustion engine monitors temperature of high pressure fuel injectors and corrects flow if threshold exceeded
CN101054930A (en) * 2006-04-11 2007-10-17 浙江飞亚电子有限公司 Electromagnetic fuel pump nozzle drive control method and its device
CN102953883A (en) * 2012-05-04 2013-03-06 浙江福爱电子有限公司 Energy-storage type high-pressure electronic fuel pump, fuel supply device and application method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4955347A (en) * 1988-04-12 1990-09-11 Honda Giken Kogyo Kabushiki Kaisha Fuel injector assembly for fuel-injected engine
DE10301653A1 (en) * 2002-01-18 2003-08-28 Denso Corp Fuel injection system for a multicylinder combustion engine monitors temperature of high pressure fuel injectors and corrects flow if threshold exceeded
CN101054930A (en) * 2006-04-11 2007-10-17 浙江飞亚电子有限公司 Electromagnetic fuel pump nozzle drive control method and its device
CN102953883A (en) * 2012-05-04 2013-03-06 浙江福爱电子有限公司 Energy-storage type high-pressure electronic fuel pump, fuel supply device and application method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112443440A (en) * 2019-09-02 2021-03-05 福爱电子(贵州)有限公司 Fuel injection unit

Also Published As

Publication number Publication date
WO2016041339A1 (en) 2016-03-24
DE112015004242T5 (en) 2017-06-29
CN105484833B (en) 2019-05-17

Similar Documents

Publication Publication Date Title
CN204344341U (en) A kind of Liquid inject batching unit
CN104675481B (en) Reducing agent spraying controlling system and method
CN101598057B (en) Reagent dosing system and method of dosing reagent
CN102918245B (en) Selective catalytic reduction system
CN105587379B (en) A kind of dpf regeneration device and method
CN102906404A (en) Scr system
CN102105662B (en) Dosing system for use in an exhaust system of a combustion engine
WO2015154640A1 (en) Scr injection metering module and control method
CN102588052A (en) SCR (selective catalyst reduction) jetting system
CN201902253U (en) Selective catalytic reduction (SCR) urea tank for diesel engine exhaust post-treatment
CN105484833A (en) Liquid jet measurement unit and control method
CN105986864B (en) SCR injection system
WO2012155291A1 (en) Integrated scr metering injection system
CN106285854B (en) A kind of SCR liquid injection apparatus
CN102162390B (en) Selective catalytic reduction system with multiple quantitative accurate injection function
CN102536397A (en) Urea supply device for vehicular SCR (selective catalytic reduction) system
CN105986866B (en) A kind of digital fluid metering device and control method
CN104564257A (en) Metered injection system of solid ammonium salt SCR
CN105822393B (en) A kind of gas assisted atomization liquid meter injection apparatus
CN202578857U (en) Selective catalyst reduction (SCR) injection system
CN202325772U (en) SCR (Selective Catalytic Reduction) reductant storage and injection system provided with built-in urea pump
CN202544973U (en) Urea supply device for vehicular SCR (Selective Catalytic Reduction) system
CN106762044B (en) A kind of gas auxiliary metering injection system and its control method
JP6379057B2 (en) Exhaust gas purification device for internal combustion engine
CN108699940A (en) The method for determining the operation of SCR reducing agent adding sets

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant