CN107237667B - Method for operating a dosing system for a reducing agent solution of an SCR catalyst device in an exhaust system of an internal combustion engine - Google Patents

Method for operating a dosing system for a reducing agent solution of an SCR catalyst device in an exhaust system of an internal combustion engine Download PDF

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Publication number
CN107237667B
CN107237667B CN201710192702.8A CN201710192702A CN107237667B CN 107237667 B CN107237667 B CN 107237667B CN 201710192702 A CN201710192702 A CN 201710192702A CN 107237667 B CN107237667 B CN 107237667B
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coolant
temperature
dosing module
dosing
information
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CN107237667A (en
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D.凯泽
R.海内克
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/005—Electrical control of exhaust gas treating apparatus using models instead of sensors to determine operating characteristics of exhaust systems, e.g. calculating catalyst temperature instead of measuring it directly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/024—Exhaust treating devices having provisions not otherwise provided for for cooling the device using a liquid
    • 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
    • F01N2610/1453—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
    • F01N2610/148—Arrangement of sensors
    • 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
    • F01N2900/1811—Temperature
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/16—Outlet manifold
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/12—Arrangements for cooling other engine or machine parts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • 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)
  • Analytical Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

In the case of a method for operating a dosing system for a reducing agent solution for an SCR catalyst device (11) in an exhaust system (10) of an internal combustion engine, the dosing system comprises at least one coolable dosing module (20) which is connected to a coolant circuit (30). The dosing module (20) is cooled by requiring a cooling power of the coolant circuit (30). According to the invention, the temperature of the coolant is taken into account when a cooling power is required, wherein the temperature of the coolant in the region of the inlet into the dosing module (20) is determined on the basis of a model. At least one piece of information about the temperature of the coolant remote from the dosing module (20) and at least one piece of information about the temperature in the region of the dosing module (20) flow into the model.

Description

Method for operating a dosing system for a reducing agent solution of an SCR catalyst device in an exhaust system of an internal combustion engine
Technical Field
The invention relates to a method for operating a dosing system for a reducing agent solution of an SCR catalyst device in an exhaust system (Abgasstrang) of an internal combustion engine, wherein the dosing system comprises at least one coolable dosing module which is connected to a coolant circuit (Kuhlmitreleislauf), in particular to a cooling water circuit.
Background
Methods and devices for operating an internal combustion engine, in particular in a motor vehicle, are known, in the exhaust gas area of which an SCR catalyst is arranged (SCR: selective catalytic reduction: (Selective Catalytic RIgnition)), which SCR-catalyst will contain Nitrogen Oxides (NO) in the exhaust gases of the internal combustion enginex) Reducing to nitrogen in the presence of a reducing agent.
The basic principle of an SCR catalyst is that: in the presence of NH as a reducing agent3The molecules of nitrogen oxides on the catalyst surface are reduced to elemental nitrogen. The required reducing agent is usually dosed into the exhaust system in the form of an aqueous urea solution. For this purpose, a dosing device or a dosing system is provided with a dosing module which doses the required reducing agent solution into the exhaust system upstream of the SCR catalytic converter.
The metering module can tolerate high temperatures, which can damage components or even lead to failure, depending on the installation location in the exhaust system. In order to reduce this thermal load, in principle, two different cooling solutions for the dosing module are known. In one aspect, a purely air-cooled dosing module is used. On the other hand, metering modules with water cooling are used, wherein these metering modules are connected to a cooling water circuit present in the motor vehicle. On the basis of a temperature model for the top of the metering valve, which is located in the metering module, the metering module can be additionally cooled under certain operating conditions by a requirement for a minimum metering of liquid reducing agent. In an operating motor, actively controlled cooling can only be achieved by this requirement for a minimum dosing quantity of reducing agent in the case of an air-cooled dosing module, whereas cooling can also be actively influenced by a requirement for a specific cooling capacity of the cooling circuit in the case of a water-cooled dosing module. However, the temperature of the coolant (cooling water) when it enters the metering module is generally not known exactly. For this purpose, the following temperature measurement quantities are used as substitute quantities: the temperature measurement is detected remotely from the dosing module.
German published patent application DE 102011088549 a1 discloses a dosing module for an SCR system having a cooling body in which a cooling water flow rate is regulated. The coolant flow is varied as a function of the temperature in the cooling body, wherein passive valves are used for this purpose on the basis of temperature-dependent bimetallic strips (bimetalstreifen).
A method for preventing thermal damage to a dosing module is known from german publication DE 102014103986 a 1. Here, the coolant-cooling amount required is calculated for preventing the heat damage. A motor coolant-cooling amount that changes according to the operation of a coupling-water pump (Kupplungs-Wasserpumpe) is calculated. The operating state of the coupling water pump is checked in the following manner: the required coolant-cooling amount is compared with the motor coolant-cooling amount. If the coupling water pump is operated such that the required coolant cooling capacity is greater than the motor coolant cooling capacity, the coupling water pump is stopped. The required coolant cooling quantity is determined here by the following temperatures of the metering module: at this temperature, the sum of the reducing agent-cooling amount and the motor coolant-cooling amount is balanced with respect to the total thermal energy of the exhaust gas (ausgegliche).
Disclosure of Invention
THE ADVANTAGES OF THE PRESENT INVENTION
The method according to the invention is based on a method for operating a dosing system for a reducing agent solution of an SCR catalytic converter device in an exhaust system of an internal combustion engine, wherein the dosing system comprises at least one coolable dosing module which is connected to a coolant circuit, in particular to a cooling water circuit. The main function of this cooling water circulation can be, for example, cooling the internal combustion engine. The cooling of the metering module, which is necessary to avoid thermal damage at the metering module, is carried out by requiring a cooling power of the coolant circuit. According to the invention, the temperature of the coolant is taken into account when the cooling power is required, wherein the temperature of the coolant in the region of the inlet (Eintritts) into the dosing module is determined on the basis of a model. The invention proceeds from this point: at this point, i.e. in the region of the dosing module, there is no temperature measuring point for the coolant. For a satisfactory requirement of the cooling power, the temperature of the coolant in the region of the inlet into the dosing module is determined on the basis of a model, wherein at least one piece of information about the temperature of the coolant remote from the dosing module and at least one piece of information about the temperature in the region of the dosing module flow (einflie beta/en) into the model. This modeling (modellerung) is based on: the temperature of the coolant on entry into the metering module lies between two limit values. One of the limit values is determined, for example, in the region of the coolant pump from a temperature value of the coolant, which can be measured further away or can be detected in addition. The other limit value is determined from the temperature value at the dosing module. By suitably calculating the temperature between the two limit values, according to the invention, the temperature of the coolant at the time of entry into the dosing module can be determined approximately and can be taken into account for the required requirements of the cooling capacity. In conventional methods, generally only temperature measurements for the coolant are taken into account, which are detected remote from the metering module, for example in the region of the coolant pump. The thermal influence of the coolant on the path from the temperature measurement point to the dosing module remains not taken into account here. Since the temperature of the coolant can vary significantly on this path, the cooling power requirement based on this coolant is only undesirable at values measured away from the dosing module. By modeling the temperature values for the coolant in the region of the metering module according to the invention, it is therefore possible to achieve specific cooling power requirements which are adapted exactly to the respective existing (herrschenden) conditions in a manner which is satisfactory.
In the method according to the invention, the information about the temperature of the coolant remote from the dosing module is preferably derived from a measured value of a coolant temperature sensor remote from the dosing module, or from a substitute value (Ersatzwert) for such a coolant temperature sensor remote from the dosing module. The temperature sensor can be located, for example, at the outlet of a cooler (e.g., a water cooler) of the internal combustion engine, in the cooling cycle of which the metering module is integrated. A cooling cycle without a temperature sensor is also possible. In this case, the value of the other sensor related to the temperature of the cooling cycle can be used instead as the temperature amount. For example, the metering module can be integrated into a cooling circuit of the intake air, wherein the measured ambient temperature can be used as a substitute quantity for the temperature in the cooling circuit. The substitute value for the coolant temperature sensor value can also be a modeled value, for example, which is calculated as a temperature value of the coolant in a manner known per se.
The information about the temperature in the region of the dosing module preferably refers to the temperature value at the dosing module itself. In general, the dosing module comprises an electrically actuable dosing valve, so that for this purpose, for example, the temperature value of the magnetic coil, i.e. the coil temperature value, can be used. The coil temperature value can be determined in a manner known per se from the resistance and the current during the active energization of the metering valve in the metering module.
In addition, at least one piece of information about the current delivery power of the coolant pump in the coolant circuit preferably flows into the model, which is used to calculate the coolant temperature in the region of the metering module.
In a particularly preferred manner, the model, which is used to model the cooling water temperature on entry into the dosing module, is based on a linear Interpolation between information about the temperature of the coolant remote from the dosing module and information about the temperature in the region of the dosing module. In particular, linear interpolation can be performed by means of interpolation coefficients. In a particularly preferred embodiment, information about the current delivery power of the coolant pump is also fed into the calculation of this interpolation factor. In addition, filtering (Filterung) and/or smoothing (Gl ä ttung) can be performed when determining the interpolation coefficients.
In addition, the invention comprises a computer program which is provided for carrying out the described steps of the method according to the invention. Finally, the invention comprises: a machine-readable storage medium on which such a computer program is stored; and an electronic control unit, which is provided to carry out the steps of the method according to the invention. The implementation of the method according to the invention as a computer program or as a machine-readable storage medium or as an electronic control unit has the following particular advantages: the method according to the invention can thus also be used in existing motor vehicles in order to optimize the cooling of the dosing module for the SCR system in this way.
Further features and advantages of the method according to the invention result from the following description of an embodiment with reference to the drawings. The individual features can be realized in each case by themselves or in combination with one another.
Drawings
Shown in the drawings are:
FIG. 1 is a schematic view of components of a dosing system with a coolable dosing module for a reductant solution for an SCR-catalyst according to the prior art; and
fig. 2 is a schematic configuration for modeling the temperature of the coolant at the inlet into the metering module according to a preferred embodiment of the method according to the invention.
Detailed Description
Fig. 1 shows a section through an exhaust system 10 of an internal combustion engine (not shown) of a motor vehicle (Ausschnitt). The exhaust system 10 comprises an SCR catalytic converter device 11 through which the exhaust gases of the internal combustion engine flow in a flow direction 12. Upstream of the SCR catalytic converter 11, a dosing module 20 is located, by means of which the reducing agent solution required for the SCR catalytic converter 11 is injected in a demand-dependent manner. The dosing module 20 is supplied with a reducing agent solution, which is stored in a Tank (Tank) 21. The reducing agent solution is removed from the tank 21 by means of a delivery pump 22 via a suction line 23 and delivered under pressure to the dosing module 20 via a supply line 24. In order to be able to cool the metering module 20, the metering module 20 is connected to a coolant circuit 30 having a coolant inlet 31 and a coolant outlet 32. The coolant circuit 30 is in particular a cooling water circuit, which is provided primarily for cooling the internal combustion engine of the motor vehicle. In the region of the coolant circuit, not shown in detail here, for the internal combustion engine, a temperature measurement of the cooling water or the coolant is provided. However, no direct temperature measurement of the coolant is possible in the region of the metering module 20. According to the invention, the temperature is modeled when the coolant enters the metering module 20. In this case, an interpolation is made between two critical temperatures for the coolant, which are formed on the one hand by measured or substitute values for the coolant remote from the dosing module and on the other hand by temperature values at the dosing module itself.
Fig. 2 shows a preferred modeling of the temperature of the coolant as it enters the metering module, which is based on the described interpolation, wherein the currently present delivery power of the coolant pump, which is not shown in any further detail here, is taken into account in the model. The temperature values 110 for the coolant remote from the dosing module flow first into the model. Furthermore, temperature values 120 detected in the region of the dosing module flow in. In this case, it can be in particular the coil temperature value of the magnetic coil of the electrically actuable metering valve of the metering module, which can be determined from the resistance and the current during the active energization of the metering valve. The temperature values 110 and 120 are linearly interpolated taking into account an interpolation factor 130 in order to model a temperature value 150 for the coolant in the region of the dosing module inlet. The currently present delivery power 140 of the coolant pump flows into the calculation of the interpolation factor 130. The interpolation factor 130 is determined here by a characteristic 141 relating to the delivery power of the coolant pump and taking into account a filtering or smoothing 142. The characteristic 143 flows into the filter or smoothing 142 as a time constant for smoothing. Taking these quantities into account, a temperature value 150 is determined for the coolant at the inlet into the metering module, which temperature value is based on the required requirements for a specific cooling capacity of the metering module.

Claims (12)

1. Method for operating a dosing system for a reducing agent solution of an SCR catalyst device (11) in an exhaust system (10) of an internal combustion engine, wherein the dosing system comprises at least one coolable dosing module (20) which is connected to a coolant circuit (30), and wherein the cooling of the dosing module (20) takes place by requiring a cooling power of the coolant circuit (30), characterized in that the temperature of the coolant is taken into account when a cooling power is required, wherein the temperature of the coolant in the region of the inlet into the dosing module (20) is determined on the basis of a model, wherein at least one piece of information (110) about the temperature of the coolant remote from the dosing module (20) and at least one piece of information (120) about the temperature in the region of the dosing module (20) flow into the model.
2. Method according to claim 1, characterized in that the information (110) about the temperature of the coolant remote from the dosing module (20) is derived from the measurement of a coolant temperature sensor remote from the dosing module (20) or a substitute value for a coolant temperature value remote from the dosing module (20).
3. The method according to claim 1 or claim 2, characterized in that the information (120) about the temperature in the region of the dosing module (20) is derived from a temperature value at the dosing module (20).
4. Method according to claim 3, characterized in that the temperature value at the dosing module (20) is the temperature value of a magnetic coil of an electrically operable dosing valve within the dosing module.
5. Method according to claim 1 or 2, characterized in that furthermore at least one information (140) about the current delivery power of a coolant pump of a coolant circuit flows into the model.
6. Method according to claim 1 or 2, characterized in that the model is based on a linear interpolation between the information (110) about the temperature of the coolant remote from the dosing module (20) and the information (120) about the temperature in the region of the dosing module (20).
7. The method according to claim 6, characterized in that the linear interpolation is performed by means of interpolation coefficients (130).
8. The method according to claim 7, characterized in that filtering and/or smoothing is performed when determining the interpolation coefficients (130).
9. The method according to claim 1, characterized in that the dosing module is connected to a cooling water circulation.
10. Method according to claim 7, characterized in that information (140) about the current delivery power of a coolant pump of a coolant circuit (30) flows into the interpolation factor.
11. A machine-readable storage medium, on which a computer program is stored, which computer program is provided for carrying out the steps of the method according to any one of claims 1 to 10.
12. An electronic controller arranged to implement the steps of the method according to any one of claims 1 to 10.
CN201710192702.8A 2016-03-29 2017-03-28 Method for operating a dosing system for a reducing agent solution of an SCR catalyst device in an exhaust system of an internal combustion engine Active CN107237667B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016205105.9A DE102016205105A1 (en) 2016-03-29 2016-03-29 A method for operating a metering system for the reducing agent solution of an SCR catalyst device in the exhaust line of an internal combustion engine
DE102016205105.9 2016-03-29

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CN107237667A CN107237667A (en) 2017-10-10
CN107237667B true CN107237667B (en) 2020-12-15

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