WO2018077526A1 - Procédé d'augmentation de la précision quantitative dans des systèmes de dosage à pression régulée - Google Patents

Procédé d'augmentation de la précision quantitative dans des systèmes de dosage à pression régulée Download PDF

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Publication number
WO2018077526A1
WO2018077526A1 PCT/EP2017/072835 EP2017072835W WO2018077526A1 WO 2018077526 A1 WO2018077526 A1 WO 2018077526A1 EP 2017072835 W EP2017072835 W EP 2017072835W WO 2018077526 A1 WO2018077526 A1 WO 2018077526A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
metering valve
metering
control
reducing agent
Prior art date
Application number
PCT/EP2017/072835
Other languages
German (de)
English (en)
Inventor
Edna Boos
Matthias Burger
Marc Chaineux
Roland Waschler
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN201780065616.9A priority Critical patent/CN109844276A/zh
Priority to EP17767806.7A priority patent/EP3529469A1/fr
Priority to KR1020197014408A priority patent/KR20190068608A/ko
Publication of WO2018077526A1 publication Critical patent/WO2018077526A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/05—Systems for adding substances into exhaust
    • 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
    • F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
    • 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
    • F01N2610/1433—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
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0402—Methods of control or diagnosing using adaptive learning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0408—Methods of control or diagnosing using a feed-back loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0418—Methods of control or diagnosing using integration or an accumulated value within an elapsed period
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1808—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1812—Flow rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1821—Injector parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1822—Pump parameters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention is based on a method for operating a metering system, in which a pressure control is combined with an adaptation of the control of a metering valve with the aim of an improved
  • the present invention relates to a computer program that performs each step of the method when running on a computing device, as well as a machine-readable one
  • Storage medium storing the computer program.
  • the invention relates to an electronic control device which is set up to carry out the method.
  • Pressure-controlled metering systems are generally based on the principle that a pump provides a desired system pressure and regulates to the narrowest possible range around a defined setpoint, and a
  • Dosing typically a metering valve based on this pressure by setting a matching valve opening time the desired amount.
  • the metered quantity accuracy depends essentially on the tolerance of the metering valve.
  • volumetry in so-called “volumetric systems” without return the ia high accuracy of the (reciprocating) pump and the property that in the stationary state, the very well-known, funded by the pump quantity also leaves the system as dosed amount again, This is thanks to the principle of volumetry in combination with the
  • N H3-releasing reagents are used, which are added to the exhaust gas.
  • an aqueous urea solution is used for this, which is injected into the exhaust gas line upstream of the S CR catalyst.
  • Reducing agent tank is generally provided a hydraulic metering system comprising a feed pump, a pressure line, a metering module, with at least one metering valve, and the required sensors and an electronic control device.
  • the feed pump promotes the feed pump
  • Reducing agent solution from the reducing agent tank via the pressure line in the dosing.
  • the metering valve is opened when it is activated, ie when an electric current is applied for control. It is kept open for a fixed drive time, so that reducing agent is injected into the exhaust system. If the metering valve is no longer activated, ie no current is applied, the metering valve closes again.
  • a pressure regulator regulates the pressure in the SCR system by adjusting the control of the feed pump according to the current requirements for the opening time of the metering valve.
  • the aim of this regulation is to adapt the prevailing, actual pressure to a desired pressure.
  • the method described herein is characterized in that an adaptive
  • Feedforward control is used for the control.
  • the control signal of the feed pump motor is at different
  • the adaptive feedforward controller As soon as the adaptive feedforward controller has learned two or more points, it is used to determine the necessary next actuating signal of the feed pump motor. Next to the
  • Feed pump motor other actuators of the metering system can be used as a control signal, but the feed pump motor provides a very accurate signal. As a result, high pressure overshoots and undershoots associated with large dosing quantity changes as well as associated long control times are avoided, thus optimizing the control quality.
  • Dosing systems which comprise a delivery module, with a generally low tolerance, a typically more tolerant thereetets metering valve, a pressure module connecting the delivery module and the metering valve and arranged between the delivery module and the metering pressure sensor. It should be noted that in this SCR system no return is provided and therefore the metering system, if not injected, represents a closed system- and no reducing agent solution can escape. While a pressure control is performed in the metering system, an adaptation of the control of the tolerance-loaded metering valve takes place.
  • the adaptation of the control of the metering valve can be carried out by means of an adaptation factor.
  • the adaptation factor depends on an integral quantity conveyed by the delivery module and on a nominal amount metered in by the metering valve, and can in particular be calculated as a quotient of the delivered quantity and the nominal metered quantity for a specific period of time.
  • Adaptation factor can be quantized a deviation of the actually metered by the metering amount of a nominal amount and this deviation can be corrected by adapting the control of the metering valve by means of the adaptation factor.
  • a high accuracy of the metered amount can be achieved in an integral manner, since the complete pumped and generally low tolerance amount is completely metered in because of the absence of return.
  • the high accuracy of the conveyor module is used in order to obtain a high accuracy - and thus a low tolerance - of the conveyed quantity.
  • a reciprocating pump to serve in the delivery module the one at each stroke by the volume of the reciprocating piston
  • the metering valve By adapting the metering valve, its activation duration can preferably be adapted.
  • the valve flow characteristic can be corrected by means of the adaptation factor. This offers a possibility, on the basis of the deviations, to carry out a quantized adaptation of the control of the metering valve.
  • the delivery module with pressure sensor and the pressure line as a controlled system with the prevailing system pressure as a control variable form a closed loop, via which the pressure control can be made.
  • a desired pressure to be established by the delivery module is compared with an actual pressure prevailing in the delivery conduit.
  • Conveyor module e.g. via a two-position controller, so controlled that the actual pressure adapts to the desired pressure.
  • a pressure-controlled system is obtained.
  • pressure-controlled systems a high accuracy of the pressure prevailing in the dosing system is achieved.
  • the pressure built up by the delivery module can not be reduced due to the absence of return and remains constant until dosing.
  • the computer program is set up to perform each step of the method, in particular when it is performed on a computing device or controller. It allows the implementation of the method in a conventional electronic control unit without having to make any structural changes. For this it is on the machine-readable
  • Control unit which is adapted to adapt the opening duration.
  • FIG. 1 shows an SCR system that can be operated by means of an embodiment of the method according to the invention.
  • FIG. 2 shows a flow diagram of an embodiment of the invention
  • FIG. 3 shows a diagram of a standardized reducing agent flow rate over a system pressure, which tolerances are governed purely volumetrically
  • Dosing system for a purely pressure-controlled dosing system and for a regulated according to an embodiment of the method according to the invention shows system.
  • FIG. 1 shows an SCR system 10 for delivering reducing agent through a
  • Pressure line 11 in a SCR catalyst not shown. It comprises a delivery module 12, which comprises a delivery pump 13, which is set up to deliver reduction agent from a reduction agent tank 14.
  • the feed pump 13 is designed as a reciprocating pump.
  • the delivery module 12 is connected via the pressure line 11 with a metering module 15, wherein reducing agent is conveyed by the delivery module 12 through the pressure line 11 to the metering module 15, where it then by a
  • Metering valve 16 is metered into an exhaust line, not shown. Furthermore, the pressure line 11 has a pressure sensor 17 which measures an actual pressure p ta t in the pressure line 11.
  • the pressure sensor 17 and the delivery module 12 are connected to an electronic control unit 18 and form a common control loop. Based on a from the
  • Pressure sensor 17 measured actual pressure p ta t and a desired pressure Pgew controls the electronic control unit 18 by means of a pressure control, the feed pump 13.
  • the electronic control unit 18 is also with the
  • Dosing module 15 and connected to the metering valve 16 and can control this.
  • the adaptation of the control of the metering valve 16 takes place within the electronic control unit 18. It should be noted here that no return into the reducing agent tank 14 is provided in this metering system, so that the delivery module 12, the pressure line 11 and the metering module 15 a form a closed system. A built-up by the delivery module 13 pressure p remains constant until dosing. Likewise, the sponsored
  • FIG. 2 shows a flow diagram of an embodiment of the invention
  • a pressure control 30 follows, at which first a pressure difference ⁇ is calculated 31 from the actual pressure ptat and the desired pressure p gew .
  • Pressure difference ⁇ then passes through a filter 32, in which undesirable
  • Interference signals are removed.
  • filter 32 a low-pass filter will be used which suppresses high-frequency signal components resulting from measurement noise or high-frequency pressure oscillations.
  • ⁇ a two-point controller 33. If the filtered pressure difference ⁇ below a threshold p s, in other words, the feed pump 13 are the actual pressure p ta t and the desired pressure p gew, is close to each other is not actuated 34 and there is no hub.
  • the feed pump in accordance with a pump frequency f p is adjusted 35 so that In this case, the actual pressure p ta t adapts to the desired pressure Pgew
  • Reducing agent mass m p easily determined 36.
  • the reductant mass delivered per stroke is determined by the volume of the piston.
  • the reducing agent mass delivered per stroke is combined with one via a
  • Measurement period executed number of strokes multiplied.
  • an adaptation 40 of the control metering valve 16 takes place, which is based on the volumetric principle of the underlying metering system. It is exploited that the integrally promoted reducing agent mass m p is completely metered through the metering valve 16. From a desired reducing agent mass m ge w is by means of
  • the electronic control unit 18 determines a nominally metered mass m n 41.
  • the nominal metered reducing agent mass m n is a supposedly integrally metered reducing agent mass of a nominal metering valve.
  • the nominal metering valve is tolerance-free with respect to the reducing agent mass metered in by it. Consequently, the nominally metered reducing agent mass m n is only dependent on the actual pressure p ta t and thus has a very low tolerance after the pressure control 30. From the nominally metered reducing agent mass m n and the integrally conveyed reducing agent mass m p , a quotient is calculated according to formula 1 over the measuring period 42: dov- m (formula 1)
  • Deviation between the actually metered reducing agent mass and the nominal metered reducing agent mass m n is an ideal
  • the adaptation factor aov is used in the following for an
  • the method is illustrated by the following example.
  • the metering valve 16 should, for example due to manufacturing tolerances and / or aging effects, Add 10% excess reducing agent. As a result, the
  • the nominally metered reducing agent mass m n is determined by the electronic control unit 18 41 so that it corresponds to the desired reducing agent mass m ge w at prevailing, actual pressure p ta t.
  • the calculation 42 of the adaptation factor aov according to formula 1 results as follows:
  • the activation period t a must then compared to a nominal
  • Control duration shortened by the reciprocal of the adaptation factor aov to compensate for the positive mass tolerance of the metering valve 16.
  • Driving time is therefore shortened by 1 «9%.
  • FIG. 3 shows a diagram of a standardized reducing agent mass flow rate R, above the system pressure p. There are shown a nominal 50, a maximum 51 and a minimum 52 course for the feed pump. The mass tolerance of
  • Feed pump 13 can be read as the difference between the maximum curve 51 and the minimum curve 52. Similarly, a nominal 60, a maximum 61 and a minimum 62 course for the metering valve 16 are shown. Similarly, the pressure tolerance and the mass tolerance of the metering valve 16 can be read out as the difference between the maximum course 61 and the minimum course 62. From the nominal curve 60, the nominal metered
  • Reducing agent mass m n are determined for the respective actual pressure p ta t.
  • the diagram from FIG. 3 shows a total tolerance 70 of a volumetric metering system operated purely pilot-operated, a total tolerance 80 of a purely pressure-controlled metering system and a total tolerance 90 of a metering system regulated according to an exemplary embodiment of the method according to the invention.
  • the total tolerance 70 of the purely pilot-operated, volumetric metering system results from the tolerance of Feed pump 13 and the tolerance of the metering valve 16.
  • the total tolerance 80 of the purely pressure-controlled metering system is essentially only dependent on the quantity tolerance of the metering valve 16.
  • the low pressure tolerance of the pressure-controlled is essentially only dependent on the quantity tolerance of the metering valve 16.
  • Dosing system combined with the reduced mass tolerance of the volumetrically controlled dosing system. Therefore, it is relatively small compared to the other two total tolerances 70 and 80. Above all, the mass tolerance is reduced by the method according to the invention, which is represented in the diagram by the symbolized as arrows projection of the total tolerances 70, 80 and 90 to the normalized reducing agent mass flow rate R m .

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

Abstract

L'invention concerne un procédé permettant de faire fonctionner un système de dosage soumis à une pression, lequel comporte un module de refoulement, une soupape de dosage et un capteur de pression. Pendant la réalisation d'une régulation de pression, la commande de la soupape de dosage grevée de tolérances est adaptée, dans le but d'améliorer la précision de la quantité de dosage intégrale.
PCT/EP2017/072835 2016-10-24 2017-09-12 Procédé d'augmentation de la précision quantitative dans des systèmes de dosage à pression régulée WO2018077526A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201780065616.9A CN109844276A (zh) 2016-10-24 2017-09-12 用于在受压力调节的配量系统中实现得到提高的量精度的方法
EP17767806.7A EP3529469A1 (fr) 2016-10-24 2017-09-12 Procédé d'augmentation de la précision quantitative dans des systèmes de dosage à pression régulée
KR1020197014408A KR20190068608A (ko) 2016-10-24 2017-09-12 압력 제어형 계량 시스템에서 양 정확도의 증가를 실현하기 위한 방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016220795.4 2016-10-24
DE102016220795.4A DE102016220795A1 (de) 2016-10-24 2016-10-24 Verfahren zur Realisierung erhöhter Mengengenauigkeit in druckgeregelten Dosiersystemen

Publications (1)

Publication Number Publication Date
WO2018077526A1 true WO2018077526A1 (fr) 2018-05-03

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PCT/EP2017/072835 WO2018077526A1 (fr) 2016-10-24 2017-09-12 Procédé d'augmentation de la précision quantitative dans des systèmes de dosage à pression régulée

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Country Link
EP (1) EP3529469A1 (fr)
KR (1) KR20190068608A (fr)
CN (1) CN109844276A (fr)
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DE102020202134A1 (de) 2020-02-19 2021-08-19 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zum Betreiben eines Dosiermittelsystems
DE102020202511A1 (de) 2020-02-27 2021-09-02 Robert Bosch Gesellschaft mit beschränkter Haftung Verfahren zur Realisierung erhöhter Dosiermassengenauigkeit in druckgeregelten Dosiersystemen mit zumindest zwei Drosselventilen
DE102020107451A1 (de) 2020-03-18 2021-09-23 Volkswagen Aktiengesellschaft Verfahren zur Steuerung und Korrektur der Einspritzmenge eines druckgeregelten Dosiersystems zur Abgasnachbehandlung eines Verbrennungsmotors

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US20130263581A1 (en) * 2010-12-16 2013-10-10 Daiji Nagaoka Exhaust-pipe injection system
EP2873820A1 (fr) * 2013-11-14 2015-05-20 Toyota Jidosha Kabushiki Kaisha Système de purification de gaz d'échappement d'un moteur à combustion interne
EP2898197A1 (fr) * 2012-08-14 2015-07-29 Emitec Gesellschaft für Emissionstechnologie mbH Procédé de fonctionnement d'un dispositif de dosage

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DE102010049071A1 (de) * 2010-10-20 2012-04-26 Emitec Gesellschaft Für Emissionstechnologie Mbh Verfahren zum Betrieb einer Dosiervorrichtung
US20130263581A1 (en) * 2010-12-16 2013-10-10 Daiji Nagaoka Exhaust-pipe injection system
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EP2898197A1 (fr) * 2012-08-14 2015-07-29 Emitec Gesellschaft für Emissionstechnologie mbH Procédé de fonctionnement d'un dispositif de dosage
EP2873820A1 (fr) * 2013-11-14 2015-05-20 Toyota Jidosha Kabushiki Kaisha Système de purification de gaz d'échappement d'un moteur à combustion interne

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EP3529469A1 (fr) 2019-08-28

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