CN103573345B - Method for running conveying and dosing system - Google Patents
Method for running conveying and dosing system Download PDFInfo
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- CN103573345B CN103573345B CN201310301176.6A CN201310301176A CN103573345B CN 103573345 B CN103573345 B CN 103573345B CN 201310301176 A CN201310301176 A CN 201310301176A CN 103573345 B CN103573345 B CN 103573345B
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- Prior art keywords
- pump
- pressure
- loopback
- medium
- conveying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- 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
- F01N2610/02—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
-
- 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
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
-
- 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
- F01N2610/148—Arrangement of sensors
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- 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)
- Reciprocating Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
In a kind of method for running conveying and dosing system, the conveying is set and dosing system is used for from storage tank（3）Trandfer fluid medium and by least one metering unit（7）Via pressure piping（4）Medium described in dosage.The system comprises at least one delivery pumps（10）It is pumped for the device of medium described in loopback, especially loopback at least one（20）And/or the distributing valve for reflux line（200）.In order to monitor and/or calibrate and/or reset actuator and/or sensor and/or in order to harmonize the model in the system, it is rinsed in the following manner in advance or along with inside the conveying and dosing system, i.e., in the metering unit（7）By activating the delivery pump when closing（10）From the storage tank（3）Pumped (conveying) medium and the activation device for medium described in loopback（20）.
Description
Technical field
The present invention relates to a kind of method for running conveying and dosing system, the conveying is set and dosing system is used for
From storage tank trandfer fluid medium and by least one metering unit via medium described in pressure piping dosage.The system packet
Include the transport path at least one delivery pump and the loop-back path at least one device for medium described in loopback.
Moreover, it relates to which a kind of computer program and the computer program product with program code, are adapted for carrying out
The method.
Background technology
The method and apparatus for especially being used to run internal combustion engine in a motor vehicle are disclosed, are disposed in its exhaust gas region
SCR（Selective catalytic reduction）Catalyst converter, the SCR catalyst make the nitrogen oxides being included in I. C. engine exhaust（NOX）
It interacts with reducing agent and is reduced into nitrogen.Thus, it is possible to significantly reduce the content of nox in exhaust.For reacting
Cheng Eryan needs the ammonia being blended in exhaust（NH3）.In order to provide ammonia usually using aqueous urea liquid, the urea liquid
It is injected in exhaust system by dosing mechanism in SCR catalyst upstream.
Urea liquid is usually previously placed in the urea liquid storage tank of motor vehicle.In order to transport urea solution be usually arranged it is defeated
It send and dosing system, the system further includes supply unit, pressure piping, metering unit, need other than urea liquid storage tank
The sensing mechanism and electronic control unit wanted.In addition, at least one heating device is arranged, the heating device can be in environment
The conveying and dosing system are heated when temperature is low and is thawed when necessary to medium, system can be placed in dosage standard
Among standby.Such as three heating circuits can be set, especially the heating of storage tank, the heating of pressure piping and pumping system plus
Heat.The heating of the pumping system can for example be realized by the existing coil of used pump.To especially include below storage tank,
Pump, valve, pipeline, dosing mechanism, the entire conveying of sensing mechanism and control device and dosing system are referred to as system.The pump of narrow sense
System includes first pump, further includes pulse buffer and pipeline and valve when necessary.
Significant components as conveying and dosing system are typically provided with delivery pump, desired by the delivery pump is conveyed from storage tank
And required amount of urea liquid and be input in pressure piping in system pressure-area.By that can include one
Urea liquid is injected in exhaust system by the metering unit of a or multiple metering valves with being suitble to demand.
In order to avoid causing the damage of the sensitive components to the system due to ice pressure when the temperature is low, usually provide,
Urea liquid is drawn back into from metering unit in storage tank by internal combustion engine or motor vehicle after stopping.For this purpose, can for example give conveying
Pump equipment converting unit, such as 4/2 reversal valve（Four two way selected valves）.It is arranged in other systems and individually carries distributing valve
Return flow line.New system can have a return flow line individually with loopback pump, loopback pump allow by medium from
Measure unit and when necessary from pressure piping resorption.
SCR catalyst system is and discharges relevant system, which must strictly monitor.Therefore, in order to accurate
It ground dosage reducing agent and therefore ensures that best exhaust aftertreatment, needs to monitor, calibrate and reset important to the system
Actuator and sensor.It is often not directed through sensor but is determined indirectly by model calculating different in system
Important Parameters, such as pressure value or temperature value.It needs reliably to input parameter for the calculating of this model.Therefore, in order to
Reliable model value can be generated, model is needed to harmonize.The different required monitoring measure and harmonize measure for
The conveying of SCR catalyst with can be problematic in dosing system and in a similar way in similar system because conveying
With in dosing system in some cases be not present foreseeable system mode.This can for example be caused by following situations, that is, be existed
Environment temperature first must thaw to the medium being present in system before it can form dosage and prepare when low.In addition,
Unpredictalbe system mode can also be caused by following situations, i.e., the rigidity of system is different in different driving patterns
's.In addition, the air content in system also can be different.Since the pressure vibration in pressure pipeline system is likely to occur resonance effect
It answers, the pressure vibration for example causes by the excitation of delivery pump and/or via the dosage of metering valve.Aloft travel（Highly
Traveling）When, it will appear gas evolution in medium.In addition, can go out after resorption medium and after being unloaded to system
Existing non-defined state.
Invention content
In contrast, the task of the present invention is improve the method for running conveying and dosing system and especially realize
To the reliable monitoring of actuator in system and/or sensor, calibration and/or reset and/or realize reliable model tune
It is accurate.
The task is resolved by the method for running conveying and dosing system provided by claim 1.The party
The preferred design scheme and corresponding computer program of method and corresponding computer program product are given by other claims
Go out.
It is based on conveying and dosing system according to the method for the present invention, the system is set and is used for from storage tank trandfer fluid medium
And it is used for by least one metering unit via medium described in pressure piping dosage.Here, being for example related to for fluid
The urea liquid is injected in SCR catalyst upstream in exhaust system by the conveying of urea liquid and dosing system.It is described defeated
Send with dosing system include at least one delivery pump and individual reflux line include it is at least one be used for loopback medium
Device, especially loopback pump and/or reflux line in distributing valve.Thereby, it is possible to the pressure by the medium from transport system
The region of side is drawn back into storage tank, with for example after the motor vehicle accordingly equipped stops can from the pressure side region and dosage
Fluid media (medium) is removed in unit.Thus, it is possible to avoid the ice pressure generated by the medium freezed to make the damage of gemel when the temperature is low
It is bad.In order to in system actuator and/or sensor be monitored and/or calibrate and/or reset and/or be
Model adjustment is carried out in system, according to of the invention in advance or along with being rinsed.Thus by delivery pump from storage tank transport Stream
Body medium, while metering unit or metering valve are to close.Here, by activating the device for sending medium back to open loopback
Path.Equipped with distributing valve for reflux line, the distributing valve is to open.There is loopback pump in systems
In the case of, loopback can be pumped to the valve operation for being placed in unlatching above or on pump operation.Via defeated in the cycle formed in this way
Pump is sent from storage tank trandfer fluid medium and is directly directed back in storage tank via reflux line.In the process of the purging method
Make the dielectric distribution in storage tank by uniform temperature adjustment processing in pumping system.Existing sky can be removed from pumping system when necessary
The inclusion of air space or gas volume.If heated in advance to conveying and dosing system, with when necessary to ice in system
The medium of jelly thaws, then the defined state of medium can be guided by flushing.It is conveying and is being reached in dosing system as a result,
To defined system mode, the system mode be actuator and/or sensor reliably monitor and/or calibrate and/
Or resetting precondition and be reliable model adjustment in system precondition.
Flushing according to the present invention particularly for system mode as defined in formation can be implemented at different times.Especially
The method according to the present invention for system optimization can be used.In addition, also can be used in eliminating system according to the method for the present invention
System error.
It for example can be by the applicable volume of delivery pump conveying and in dosage in order to implement purging method according to the present invention
Valve is imported into storage tank when closing via the distributing valve in loopback pump or reflux line again.Such as it also can be with the suitable of delivery pump
Implement the purging method with the pump lift of quantity.When described there are that when distributing valve, can respectively turn in reflux line
Distributing valve is for rinsing reflux line.When there are loopback pump, it can for example be run in the valve of unlatching in the purging method
In, namely 100% and non-clock pulses in the valve operation opened, trigger loopback pump.In addition, the loopback pump
Can be effectively positioned on pump operation, mode be clock pulses trigger loopback pump.Thus, it is possible to effectively support back
It is sent in storage tank or flushing process according to the present invention.
It is proposed that regulation is equipped in order to which medium to be transmitted back in storage tank relative to defeated for a kind of according to the method for the present invention
The system for sending the individual reflux line in path.The individual loop-back path is not preferably passed into storage tank filter, but
It is passed directly into storage tank outside storage tank filter.Thus, it is possible to avoid importeding into the process of purging method according to the present invention
Vapor volume in storage tank, that may be present or gas volume can stay in storage tank filter and be drawn into transport system again
In.
Advantageously, under environmental pressure or pressure close to environmental pressure, namely almost implementing root to no pressure
According to the purging method of the present invention.Therefore, it can specify that before implementing purging method and discharge degree carried out to system when necessary.For
This can for example close metering valve and open loop-back path.Implement flushing process according to the present invention under about environmental pressure
Has the following advantages, i.e., under ambient pressure either under small negative pressure or superpressure the compression ratio of the delivery pump at each
In the case of it is all good enough, can be conveyed from the component space of pump and eliminate possible gas volume.
Can advantageously, so triggering pumping system in actuator, i.e. especially delivery pump and/or loopback pump, thus
Delivery pump on the pressure side on form small negative pressure or small superpressure.This can carry out flushing process according to applicable cases
Accelerate and optimizes.It is furthermore possible to advantageously, activate or open delivery pump with being staggered in time and for loopback medium
Device, the distributing valve i.e. especially in loopback pump or reflux line.Such as delivery pump can be lingeringly activated in time.Thus
Also pressure ratio can be adjusted, the pressure ratio optimizes the conveying from storage tank to medium and thus optimizes flushing.Upper
Hereinafter it can also activate multistagely and/or briefly deactivate delivery pump and/or the device for loopback medium.By
This, purging method according to the present invention can match different specified criterias and be adjusted in different pressure ratio.Such as it can
Enough variant schemes implemented according to the service condition detected and/or the method is specifically applied according to purposes.
It can implement purging method according to the present invention in monitoring, calibration, resetting or the preparation of model alignment procedure.Institute
Stating process also can carry out during implementing purging method according to the present invention.
It should be used to especially harmonize in monitoring, calibration, resetting or model according to purging method according to the present invention is implemented
System optimization in the preparation of process and/or concurrently is carried out, still should for example eliminate systematic error, it can be according to purposes
Operating parameter and/or release conditions and/or interrupt condition of the specifically application for flushing.
In another design scheme according to the method for the present invention, the success of system mode as defined in foring can be detected
And end flushing, mode is to close loop-back path and according in the pump operation of delivery pump, namely conveying
Pressure initiation when pumped living sees whether to produce the pressure initiation of expectation.As long as such as Jie by uniform temperature adjustment processing
Distribution of the matter in pumping system is unsuccessful such as also gas volume is present in significant amount in system, would not occur
Desirable pressure initiation.It can continue to flushing process or when necessary step-up error in this case.
Applicable cases for purging method according to the present invention include for actuator or sensor different monitorings,
Calibration and reset process and different model alignment procedures.More particularly to be used to implement using purging method according to the present invention
One or more of following procedure process or for optimizing its implementation：
Pressure detector is aligned in known pressure, especially carries out zero point correction and/or deviation elimination；
Pressure sensor is aligned in known pressure, especially carries out zero point correction and/or deviation elimination；
Confidence level test is carried out to pump and/or finds the armature shock moment of pump, especially with the electric current letter by pumping
In the system of number obtained pressure interpretation, wherein error can be for example eliminated, to can no longer detect the rank from software
Iron shock moment；
It is armature shock moment of monitoring pump in the state of regulation, old during service life particularly for monitoring pump
Change；
Harmonize temperature model, particular by the film that can harmonize the delivery pump by the tank temperature of sensor measurement
Piece temperature.
In addition, the invention also includes computer program, when running the computer journey on arithmetic facility or control device
The computer program implements all steps of the method when sequence.In addition, the invention also includes the calculating with program code
Machine program product, the computer code, which is stored on machine readable carrier, to be transported for working as on arithmetic facility or control device
Implement according to the method for the present invention when row described program.It is executed according to the method for the present invention with following excellent as computer program
Point, the i.e. program are also without being difficulty used in existing motor vehicle, with can be by purging method according to the present invention
Advantage is for preparing monitoring, calibration, resetting or model alignment procedure.
Description of the drawings
Other features and advantages of the present invention are provided by the following description combination attached drawing to embodiment.Here, described each
Feature can be realized separately or be realized in combination with one another.In the accompanying drawings：
Fig. 1 shows the schematic diagram for being currently used in conveying and the component of the system of dosage fluid media (medium)；
Fig. 2 shows the hydraulic circuit diagrams of the system pumped with loopback in the prior art；And
Fig. 3 shows the hydraulic circuit diagram with the system of the distributing valve in the prior art for return flow line.
Specific implementation mode
The conveying of reducing agent shown in FIG. 1, for SCR catalyst system and dosing system are used as being adapted for carrying out
Illustrative system according to the method for the present invention.The invention is not limited in this systems.More precisely, according to the present invention
Purging method also can be used in other conveyings and dosing system with individual loop-back path.Such as it also is adapted for having and carry
The pumping system of the reflux line of distributing valve rather than loopback pump.The pumping system of conveying and dosing system in Fig. 1 includes conveying mould
Block 1 and loopback module 2.Here, the conveyor module 1 includes basic delivery pump 10, the delivery pump is designed to have reciprocal
The reciprocating piston pump 10 of magnet 11, spring 12, diaphragm 13 and reciprocating-piston 14.In addition, there is inlet valve 15 in conveyor module 1
With dump valve 16.Loopback pump 20 in loopback module 2 is designed in the corresponding way in principle.It is equally deposited in the module
Entering valve 21 and dump valve 22.
In conventional dosage operation, fluid media (medium) is transported to from storage tank 3 in pressure piping 4 by conveyor module 1, with
It can be metered into exhaust system via dosage module 7（It is not shown）In, before the dosage module includes metering valve 71 and is connected to
The strainer 72 in face.After system stopping, in fact by activation resorption module 2, namely particularly by activation loopback pump 20
The now routinely resorption medium from the region on the pressure side of pumping system.The loopback can be by the feelings that in clock pulses trigger
Loopback pumps the pump operation of 20 activation to carry out under condition.On the other hand loopback can also be pumped to 20 be placed in the valve operation of unlatching.
It is not limited to the pump with reciprocating magnet driving device shown in Fig. 1 according to the method for the present invention.According to this hair
Bright method can be also used in in other pump drives, such as pumping system of rotation motor, stepper motor.
Fig. 2 shows the conventional hydraulic circuit diagrams for conveying in the prior art and dosing system, according to the present invention
Purging method can be used in the system.The hydraulic circuit diagram substantially corresponds to system shown in Fig. 1, wherein instead of
Reciprocating magnet driving device can also use other pump drives.The corresponding element of the system is equipped with identical with Fig. 1
Reference numeral.It can be especially after system stopping from metering valve 71 and/or pressure by the pump operation of loopback pump 20
Pipeline 4 removes medium.The ice pressure caused by the reducing agent that freezes can be so avoided passing through when the temperature is low to quick in system
Sense component damages.
Fig. 3 shows the hydraulic circuit diagram for another conveying and dosing system, can use in the system same
The purging method according to the present invention having the advantage that.Unlike system shown in Fig. 2, which has in return flow line
Distributing valve 200 rather than loopback pump.That is return flow line or loop-back path can be opened within the system, thus, it is possible to
Medium is pushed back in storage tank 3.However cannot in loop-back path effectively pumping medium.
Implement purging method according to the present invention for prepare in advance or along with monitoring, calibration, reset process and/or
Model is harmonized, and mode is especially to convey and system mode as defined in formation in dosing system.System mode as defined in described
On the one hand it is the unified temperature adjustment processing and distribution of medium in system.On the other hand system mode as defined in described is for example to consider
To pump diaphragm equably temperature adjustment processing in the case of the system component and component.
In order to implement purging method according to the present invention, closing the metering valve 71 or be closed when flushing process starts
Metering valve 71.Therefore, boundary condition of the flushing process independently of the physics of exhaust side.However the condition of exhaust side is when necessary
Release for the process（Freigabe）For can be significant.For described process itself, namely flushing side
For method, the boundary condition of the physics of exhaust side will not have an impact.Closing metering valve 71（Dosage module 7）Later or
Metering valve 71（Dosage module 7）When closing, delivery pump 10 is activated in order to implement flushing process according to the present invention.Here, described
Delivery pump is triggered especially with applicable frequency.Opening loop-back path means to activate the device for sending medium back to.
In loop-back path there are distributing valve 200 in the case of open distributing valve 200.Simply by the presence of loopback pump 20, it will be able to utilize and be applicable in
Frequency triggering loopback pump 20 so that its pumping function activate.On the other hand loopback pump can also be triggered to non-clock pulses
20, so that its valve function activation, that is to say, that fully open loop-back path.The unlatching of the loop-back path and delivery pump
Triggering can be carried out at the same time or carry out with being staggered in time.By the pump operation of delivery pump from 3 trandfer fluid medium of storage tank.
Because metering unit 7 is to close, the medium guides via transport path from storage tank 3 and draws again via loop-back path
It leads back in storage tank 3.In this way so that the dielectric distribution in storage tank by uniform temperature adjustment processing is in pumping system, to
In the case where the uniform temperature adjustment processing of medium in view of system is with distribution and in view of the various components and structure of system
System mode as defined in being formed in the case of the uniform temperature adjustment processing of part.Purging method according to the present invention can be real without pressure
It is existing, wherein carrying out discharge degree to system before starting purging method when necessary.It can be by correspondingly according to applicable cases
Actuator in triggering system delivery pump 10 on the pressure side on form small negative pressure or small superpressure, with when necessary most
Optimize and/or accelerate flushing process according to the present invention.
Actuator, namely corresponding distributing valve 200 swashs especially in delivery pump 10 and loopback pump 20 or reflux line
Work carries out in which can be staggered in time, and mode is the distributing valve for example triggered first in loopback pump 20 or reflux line
200 and after a delay time connect delivery pump 10.The triggering of actuator also can multistagely change in purging method,
Such as changed according to the service condition detected.Such as loopback pump 20 can be triggered completely first, to operate loopback pump 20
Valve function.Loopback pump 20 can pulsedly be run with applicable frequency clock after the applicable time, to which medium to have
It is attracted deposit by loop-back path blowback in tank 3 on effect ground.
Purging method according to the present invention can be used in for example with the pressure interpretation obtained by the current signal pumped
In system under defined pressure state realize system reset and/or then during flushing process particularly by via
Software, which changes triggering, to carry out defined confidence level test or finds armature shock moment
（Ankeranschlagszeitpunkt）.In addition, purging method according to the present invention allows under defined system mode to being
The sensor of system carries out calibrating and for example carrying out zero point correction or deviation elimination.Purging method according to the present invention provides
The scheme of the actuator of assessment system under defined system mode, such as the aging of pump can be assessed.In addition, according to the present invention
Method allow under defined system mode harmonize software in model, such as temperature model or pressure model.Such as it can
The diaphragm temperature of the modelling of delivery pump is harmonized using the tank temperature by sensor measurement.
For different optimization process（Monitoring, calibration, resetting, model are harmonized）Or for eliminate error according to this hair
A kind of applicable cases of bright purging method are in the system for not pressure sensor, in the system for example by conveying
The current signal of pump derives pressure interpretation（Druckinterpretation）.This for example can be by armature shock moment
Analysis realize.In conventional operation, the pressure interpretation can for example due in current signal measurement error or due to it
He influences and fails.It is no longer able to acquire pressure information in this case.It can be incited somebody to action by purging method according to the present invention
System is placed in especially in the state of known in terms of system pressure.Delivery pump can be examined in flushing process according to the present invention
Survey confidence level.If subsequent current signal or pressure interpretation restore that normally, the mistake of dosage emerged in operation can be eliminated again
Difference.
Such as in these cases by the current signal of delivery pump derive pressure interpretation, pressure sensor is not
In system, the calibration to the pressure interpretation can be carried out in purging method or after implementing purging method when necessary（Example
As zero point correction or deviation are eliminated）.
The another application scheme of purging method according to the present invention is to pass through the function of delivery pump in defined operating point
The aging of the delivery pump is assessed, the operating point can be by purging method according to the present invention（Spülverfahren）
It is adjusted（Such as drift identification when pressure detection）.
Furthermore it is possible to correct or harmonize when necessary the temperature for conveying device by purging method according to the present invention
Model.Medium is conveyed from storage tank using purging method according to the present invention or is recycled in conveying device.Usually pass through phase
The sensing mechanism answered knows tank temperature, so that this can be used in calibrating the thermal module of conveying device.
When reaching desirable flush volume or perform the pump lift of determining applicable quantity（Pumpenhub）
When, it can regularly terminate purging method according to the present invention according to applicable cases.Additionally it is possible to provide purging method in advance
Terminate the applicable time that must be over before.In the system of not pressure sensor and in the pressure obtained by delivery pump stream
Other interrupt conditions can be used as to propose in power interpretation, pressure detector is made correctly to work again.Other possible interruptions
Condition be terminate calibration to sensing mechanism, terminate model harmonize or to the actuator of system, such as delivery pump detection is credible
Degree carries out aging detection.Other conditions specifically can in advance be provided according to purposes.
According to applicable cases, it can also terminate purging method according to the present invention in error conditions.Such as it can hold
Row device monitoring device terminates when detecting the current signal of wrong, for example excessive electric current, short circuit or universal irregular operating
The purging method.When detecting mistake in Sensor monitoring device or in insecure pressure initiation, especially more than
When applicable pressure threshold, or under the conditions of other are specific according to purposes, purging method according to the present invention can be terminated.
Purging method according to the present invention can be used in different places in principle, particularly for system optimization and/or use
In elimination systematic error, for example pressure interpretation is lost in the system of no pressure sensor and required error concealment device
When losing.Here, compared to will be used to monitor according to the method for the present invention, calibrate, resetting and/or model harmonize, eliminate systematic error
It is preferred that with higher priority together with time upper higher requirement.
Standard commonly used in discharging or initializing can be that there is no the executing agency/sensing mechanisms for hindering supervisor
Error.Other conditions specifically can in advance be provided according to purposes.For that can be disappeared by purging method according to the present invention
For the error removed, quick system response is usually required that（" hard release（harte Freigabe）”）.In this case, real
Existing purging method according to the present invention with high priority.When requiring purging method according to the present invention for preparing in advance or
Person can search out along with calibrating or similar action such as when being harmonized for model and suitable implement the moment
（" soft release（weiche Freigabe）”）.
Claims (16)
1. the method for running conveying and dosing system, is arranged the conveying and dosing system is used for from storage tank（3）Transport Stream
Body medium and by least one metering unit（7）Via pressure piping（4）Medium described in dosage, wherein the system comprises
With at least one delivery pump（10）Transport path and loopback road at least one device for medium described in loopback
Diameter, which is characterized in that in order to monitor and/or calibrate and/or reset actuator and/or sensor and/or in order to harmonize
The model in system is stated, is rinsed in the following manner in advance or along with inside the conveying and dosing system, i.e.,
In the metering unit（7）By activating the delivery pump when closing（10）From the storage tank（3）Pumped (conveying) medium and activate institute
State the device for medium described in loopback（20；200）, wherein activate the delivery pump with being staggered in time（10）With it is described
Device for medium described in loopback（20；200）, wherein the delivery pump is lingeringly activated in time（10）.
2. method as described in claim 1, which is characterized in that carry out the flushing in the conveying and dosing system and be used for
System mode as defined in being formed.
3. method as described in claim 1 or 2, which is characterized in that implement the method and be used for system optimization.
4. method as described in claim 1, which is characterized in that implement the method for eliminating systematic error.
5. method as described in claim 1, which is characterized in that under environmental pressure or pressure close to the environmental pressure
Carry out the flushing.
6. method as described in claim 1, which is characterized in that the device for medium described in loopback is loopback pump（20）
And so trigger the loopback pump（20）, in the delivery pump（10）On the pressure side upper generate small negative pressure or small
Superpressure.
7. method as described in claim 1 multistagely, which is characterized in that activate and/or briefly deactivate described defeated
Send pump（10）And/or the device for medium described in loopback（20；200）.
8. method as described in claim 1, which is characterized in that the operation according to purposes specifically application for the flushing is joined
Number and/or release conditions and/or interrupt condition.
9. method as described in claim 1, which is characterized in that detection is successfully rinsed in the following manner, i.e., described in closing
Device for medium described in loopback（20；200）And it monitors and is activating the delivery pump（10）When pressure initiation.
10. method as described in claim 1, which is characterized in that the monitoring and/or school to actuator and/or sensor
Accurate and/or resetting and/or the adjustment to the model in the system include at least one of following procedure process：
Pressure detector is aligned in known pressure；
Pressure sensor is aligned in known pressure；
Confidence level test is carried out to pump and/or finds the armature shock moment of pump；
Monitor the armature shock moment of pump；
Harmonize temperature model.
11. method as described in claim 1, which is characterized in that the device for medium described in loopback is loopback pump
（20）And/or the distributing valve for reflux line（200）.
12. method as described in claim 10, which is characterized in that it includes zero that pressure detector, which is aligned in known pressure,
Point calibration and/or deviation are eliminated.
13. method as described in claim 10, which is characterized in that it includes zero that pressure sensor, which is aligned in known pressure,
Point calibration and/or deviation are eliminated.
14. method as described in claim 10, which is characterized in that carry out confidence level test to pump and/or find the armature of pump
Shock moment carries out in the system with the pressure interpretation obtained by the current signal pumped.
15. method as described in claim 10, which is characterized in that the monitoring of the armature shock moment pumped is for supervising
Survey aging of the pump during service life.
16. method as described in claim 10, which is characterized in that it includes by can be surveyed by sensor to harmonize temperature model
The tank temperature of amount harmonizes the diaphragm temperature of the delivery pump.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012212565.5 | 2012-07-18 | ||
| DE201210212565 DE102012212565A1 (en) | 2012-07-18 | 2012-07-18 | Method for operating conveying- and dosing system for e.g. dosing e.g. urea solution over pressure line in motor car, involves conveying fluid medium from tank by activation of feed pump, and activating pump for reverse conveying of medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103573345A CN103573345A (en) | 2014-02-12 |
| CN103573345B true CN103573345B (en) | 2018-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310301176.6A Active CN103573345B (en) | 2012-07-18 | 2013-07-17 | Method for running conveying and dosing system |
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| Country | Link |
|---|---|
| CN (1) | CN103573345B (en) |
| DE (1) | DE102012212565A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3069574B1 (en) | 2017-07-25 | 2019-08-02 | Continental Automotive France | METHOD FOR ADAPTING A QUANTITY OF REDUCING AGENT FOR GAS NITROGEN OXIDE DEPOLLUTION IN AN ENGINE EXHAUST LINE |
| CN107246302A (en) * | 2017-08-09 | 2017-10-13 | 华中科技大学无锡研究院 | A kind of urea pumping system |
| DE102017223365A1 (en) * | 2017-12-20 | 2019-06-27 | Robert Bosch Gmbh | Method for operating a hydraulic system |
| DE102020215263B4 (en) | 2020-12-03 | 2023-10-19 | Vitesco Technologies GmbH | Method for dosing an aqueous urea solution |
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| EP1656986A1 (en) * | 2004-11-15 | 2006-05-17 | Pankl Emission Control Systems GmbH | Urea dosing device |
| CN201258777Y (en) * | 2008-05-28 | 2009-06-17 | 张家口百通环保科技有限公司 | End gas purification system for internal combustion engine |
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| DE102010004614A1 (en) * | 2010-01-13 | 2011-07-14 | Emitec Gesellschaft für Emissionstechnologie mbH, 53797 | Tank arrangement and metering system for a reducing agent |
| CN202081942U (en) * | 2011-06-10 | 2011-12-21 | 苏州派格力减排系统有限公司 | Liquid heating type metering injection pump for SCR system |
| CN102312706A (en) * | 2010-07-02 | 2012-01-11 | 罗伯特·博世有限公司 | Operation is used for the method for the reductant metering system of SCR catalyst |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE535338C2 (en) * | 2010-01-14 | 2012-07-03 | Scania Cv Ab | Apparatus and method for heating a reductant in a SCR system of a motor vehicle |
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2012
- 2012-07-18 DE DE201210212565 patent/DE102012212565A1/en not_active Withdrawn
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- 2013-07-17 CN CN201310301176.6A patent/CN103573345B/en active Active
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|---|---|---|---|---|
| EP1656986A1 (en) * | 2004-11-15 | 2006-05-17 | Pankl Emission Control Systems GmbH | Urea dosing device |
| CN201258777Y (en) * | 2008-05-28 | 2009-06-17 | 张家口百通环保科技有限公司 | End gas purification system for internal combustion engine |
| CN101845982A (en) * | 2009-03-02 | 2010-09-29 | 通用汽车环球科技运作公司 | Select the NO of catalyst reduction system XThe diagnosis based on model of sensor fault |
| DE102010004614A1 (en) * | 2010-01-13 | 2011-07-14 | Emitec Gesellschaft für Emissionstechnologie mbH, 53797 | Tank arrangement and metering system for a reducing agent |
| CN102312706A (en) * | 2010-07-02 | 2012-01-11 | 罗伯特·博世有限公司 | Operation is used for the method for the reductant metering system of SCR catalyst |
| CN202081942U (en) * | 2011-06-10 | 2011-12-21 | 苏州派格力减排系统有限公司 | Liquid heating type metering injection pump for SCR system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103573345A (en) | 2014-02-12 |
| DE102012212565A1 (en) | 2014-01-23 |
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