WO2014042583A1 - Système scr et procédé pour déterminer de manière fiable si une pompe à circulation pour agent réducteur peut être mise en route en toute sécurité - Google Patents

Système scr et procédé pour déterminer de manière fiable si une pompe à circulation pour agent réducteur peut être mise en route en toute sécurité Download PDF

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Publication number
WO2014042583A1
WO2014042583A1 PCT/SE2013/051064 SE2013051064W WO2014042583A1 WO 2014042583 A1 WO2014042583 A1 WO 2014042583A1 SE 2013051064 W SE2013051064 W SE 2013051064W WO 2014042583 A1 WO2014042583 A1 WO 2014042583A1
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WO
WIPO (PCT)
Prior art keywords
reducing agent
container
temperature
scr system
accumulated amount
Prior art date
Application number
PCT/SE2013/051064
Other languages
English (en)
Inventor
Kurre KÄLLKVIST
Johan WÄNGDAHL
Per Bremberg
Ola Hall
Pär Karlsson
Original Assignee
Scania Cv Ab
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 Scania Cv Ab filed Critical Scania Cv Ab
Priority to DE112013004168.5T priority Critical patent/DE112013004168B4/de
Publication of WO2014042583A1 publication Critical patent/WO2014042583A1/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
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/105—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
    • F01N2610/1433—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
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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
    • 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

Definitions

  • the present invention relates to a method pertaining to an SCR system.
  • the invention delates also to a computer programme product comprising programme code for a computer for implementing a method according to the invention.
  • the invention relates also to an SCR system and a motor vehicle equipped with the SCR system.
  • SCR systems which comprise an SCR catalyst in which said reductant and NO x gas can react with one another and be converted to nitrogen gas and water.
  • reductants may be used in SCR systems. These reductants have different freezing points.
  • AdBlue is an example of a commonly used reductant.
  • One type of SCR system comprises a container which holds a reductant. The system has also a pump arranged to draw said reductant from the container via a suction hose and supply it via a pressurised hose to a dosing unit situated adjacent to an exhaust system of the vehicle. The dosing unit is arranged to inject a necessary amount of reductant into the exhaust system upstream of the SCR catalyst according to operating routines which are stored in a control unit of the vehicle.
  • Said reductant may have a freezing point within a range of -10 to -15 degrees Celsius. Different reductants have unique freezing points depending inter alia on their material composition. AdBlue has for example a freezing point at approximately -12 degrees Celsius. This means that said reductant in the
  • Prevailing regulations concerning emissions require that certain vehicles equipped with an SCR system must run normally by a certain predetermined time after the vehicle starts up.
  • Said predetermined time may in one example be 70 minutes. This means that frozen reducing agent has to be at least partly melted to being able to circulate in the SCR system before dosing commences within said period of time.
  • a known way of assessing whether it is appropriate to start up a circulation pump and the dosing of reducing agent is to use a temperature sensor situated in the container to measure a prevailing temperature of said reducing agent. This makes it possible to determine with a certain degree of probability whether said reducing agent in the container has thawed or not.
  • a disadvantage of said method is that temperature measurements do not always provide a basis for correct assessment, depending for example on where the sensor is fitted, the configuration of, for example, a suction hose and the configuration and size of the container. This means that quite large safety margins are necessary to avoid starting a circulation pump of the SCR system too soon.
  • US 20100095653 describes a method for thawing frozen urea whereby the dosing system is activated when said urea has reached a certain temperature.
  • One object of the present invention is to propose a novel and advantageous method pertaining to an SCR system.
  • Another object of the invention is to propose a novel and advantageous SCR system and a novel and advantageous computer programme pertaining to an SCR system.
  • a further object of the invention is to propose a method pertaining to an SCR system, an SCR system and a computer programme for achieving quicker start-up of an SCR system of a motor vehicle in cases where a reducing agent for exhaust cleaning is at least partly frozen.
  • a further object of the invention is propose a method pertaining to an SCR system, an SCR system and a computer programme for achieving reliable actuation of an SCR system of a motor vehicle.
  • a further object of the invention is to propose a method pertaining to an SCR system, an SCR system and a computer programme for improving the performance of a motor vehicle.
  • One object of the invention is to propose an SCR system whereby dosing of a reductant, e.g. urea in the form of AdBlue, can be commenced more quickly in a situation where said reductant is initially at least partly in a frozen state.
  • a reductant e.g. urea in the form of AdBlue
  • One object of the invention is to propose an SCR system whereby circulation of a reductant, e.g. urea in the form of AdBlue, can be commenced more quickly in a situation where said reductant is initially at least partly in a frozen state.
  • a reductant e.g. urea in the form of AdBlue
  • One aspect of the invention proposes a method pertaining to an SCR system provided with a circulation pump and a dosing unit, for not only assessing the need to warm reducing agent for exhaust cleaning which is in a container by means of a warming medium which circulates through said container, but for determining also whether starting up of circulation of said reducing agent in said SCR system is appropriate in response to said warming.
  • the method comprises the steps of: - determining whether reducing agent present in the container is at least partly frozen and, if such is the case,
  • One version continuously integrates an estimated heat transfer from said circulating warming medium to said reducing agent over time in order to determine an amount of melted reducing agent in the container. It is thus possible for the circulation pump to be started when a sufficient first amount of reducing agent has thawed instead of having to wait until a temperature of said reducing agent in the tank has risen above a certain limit value. It is thus possible for dosing of reducing agent to be started when a sufficient second amount of reducing agent has thawed instead of having to wait until a temperature of said reducing agent in the tank has risen above a certain limit value.
  • the method may further comprise the step of
  • the result is an improved method pertaining to an SCR system whereby an adequate estimate of the amount of energy transferred serves as a basis for determining as quickly as possible whether the SCR system can be started up safely and with minimum damage to components.
  • the method may further comprise the step of
  • the present invention proposes a method whereby circulation of reducing agent and its subsequent dosing may take place even when not all of the reducing agent in the container has thawed. According to the invention it is only necessary to thaw predetermined respective first and second amounts of reducing agent in order in an operationally safe way to activate said pump and dosing of reducing agent by the dosing unit.
  • Starting up said circulation pump may be deemed appropriate when a certain accumulated amount of reducing agent is determined.
  • Said accumulated amount may be a suitable amount which may be example be determined on the basis of the size of the container, the amount of reducing agent remaining and the configuration of the SCR system. It may for example be 5 litres.
  • the method may further comprise the step of
  • Said accumulated amount may be a suitable amount which may be example be determined on the basis of the size of the container, the amount of reducing agent remaining and the configuration of the SCR system. It may for example be 15 litres.
  • An advantage of the innovative method is that a quicker process for thawing of at least partly frozen reductant which is present in the container is achieved by the possibility of the circulation pump being started at a relatively early stage.
  • Using heating elements during circulation of said reducing agent in the SCR system makes it possible to achieve a quicker thawing process.
  • a circulating warming medium may be used to warm the reductant in various parts of the SCR system outside the container.
  • An advantageous synergy effect from using heating elements external to the container in conjunction with a said warming medium in the container is the achievement of quicker thawing of the reductant in the container as a result of increased stirring in the container due to a flow of the reductant during a phase when it is circulated within the SCR system, and particular in the container, without being dosed into the exhaust flow.
  • One version uses a plurality of heating elements external to the container in the process of thawing the reductant which is present in the container.
  • One aspect of the invention proposes to provide the vehicle's SCR system with a number of different heating elements so situated as to warm the reductant present in various lines and components of the SCR system.
  • the method is easy to implement in existing motor vehicles.
  • Software pertaining to an SCR system according to the invention may be installed in a control unit of the vehicle during the manufacture of the vehicle.
  • a purchaser of the vehicle may alternatively have the possibility of selecting the function of the method as an option.
  • software comprising programme code for applying the innovative method to an SCR system may be installed in a control unit of the vehicle on the occasion of upgrading at a service station, in which case the software may be loaded into a memory in the control unit.
  • One aspect of the invention proposes a system according to claim 6.
  • One aspect of the invention proposes an SCR system comprising:
  • the SCR system may further comprise
  • the SCR system may further comprise
  • the SCR system may further comprise
  • the SCR system may further comprise
  • the above objects are also achieved with a motor vehicle provided with the aforesaid SCR system.
  • the vehicle may be a truck, bus or car.
  • One aspect of the invention proposes an SCR system provided with a container for said reductant and a dosing unit for an exhaust system of a marine engine.
  • One aspect of the invention proposes an SCR system provided with a container for said reductant and a dosing unit for an exhaust system of a industrial engine.
  • One aspect of the present invention proposes a computer programme pertaining to an SCR system and comprising programme code stored on a computer-readable medium for causing an electronic control unit or another computer connected to the electronic control unit to perform steps according to any one of claims 1-5.
  • One aspect of the present invention proposes a computer programme pertaining to an SCR system and comprising programme code for causing an electronic control unit or another computer connected to the electronic control unit to perform steps according to any one of claims 1-5.
  • One aspect of the present invention proposes a computer programme product comprising a programme code stored on a computer-readable medium for performing method steps according to any one of claims 1-5 when said computer programme is run on an electronic control unit or another computer connected to the electronic control unit.
  • Figure 1 schematically illustrates a vehicle according to an embodiment of the invention
  • Figure 2 schematically illustrates a subsystem of the vehicle depicted in Figure 1 , according to an embodiment of the invention
  • Figure 3 schematically illustrates a subsystem of the vehicle depicted in Figure 1 , according to an embodiment of the invention
  • Figure 4a is a schematic flowchart of a method according to an embodiment of the invention.
  • Figure 4b is a more detailed schematic flowchart of a method according to an embodiment of the invention.
  • Figure 5 schematically illustrates a computer according to an embodiment of the invention.
  • Figure 1 depicts a side view of a vehicle 100.
  • the exemplified vehicle comprises a tractor unit 110 and a trailer 112.
  • the vehicle may be a heavy vehicle, e.g. a truck or a bus. It may alternatively be a car.
  • link refers herein to a communication link which may be a physical connection such as an opto-electronic communication line, or a non-physical connection such as a wireless connection, e.g. a radio link or microwave link.
  • reductant refers herein to an agent used for reacting with certain emissions in an SCR system. These emissions may for example be NO x gas. In one version said reductant is so-called AdBlue. Other kinds of reductant may of course be used. AdBlue is herein cited as an example of a reductant, but one skilled in the art will appreciate that the innovative method and the innovative device are feasible with other types of reductants, subject to necessary adaptations, e.g. adaptations to appropriate freezing points for chosen reductants, in control algorithms for executing software code in accordance with the innovative method.
  • heating element refers herein to a device provided to warm an adjoining component, e.g. a line, pump or dosing unit, which contains said reductant.
  • the heating elements herein indicated are thus provided to warm the reductant at various locations in the vehicle 100.
  • a heating element may be an electrical heating element powered by, for example, one or more batteries (not depicted).
  • a heating element may be a coolant-based heating element which uses radiator liquid from an engine of the vehicle to warm said reductant in a container for reducing agent of the SCR system.
  • the invention is suitable for application in any SCR system and is therefore not confined to SCR systems of motor vehicles.
  • the innovative method and the innovative fluid supply system according to an aspect of the invention are well suited to other platforms which comprise an SCR system than motor vehicles, e.g. watercraft.
  • the watercraft may be of any kind, e.g. motor boats, steamers, ferries or ships.
  • the innovative method and the innovative SCR system according to one aspect of the invention are also well suited to, for example, systems which comprise tractors, dumpers, power tools, industrial engines and/or engine-
  • the innovative method and the innovative SCR system according to one aspect of the invention are also well suited to various kinds of power plants, e.g. an electric power plant provided with a diesel generator.
  • the innovative method and the innovative SCR system are also well suited to any engine system which comprises an engine and an SCR system, e.g. of a locomotive or some other platform.
  • the innovative method and the innovative SCR system are well suited to a system which comprises an NO x generator, e.g. a diesel engine, with exhaust gases which need cleaning.
  • the term "line” refers herein to a passage for holding and conveying a fluid, e.g. a reductant in liquid form.
  • the line may be a pipe of any size and be made of any suitable material, e.g. plastic, rubber or metal.
  • Figure 2 depicts a subsystem 299 of the vehicle 100.
  • the subsystem may be situated in the tractor unit 110.
  • the subsystem may be part of an SCR system.
  • the subsystem comprises in this example a container 205 arranged to hold a reductant.
  • the container is arranged to contain a suitable amount of reductant and to be replenishable as necessary.
  • a first line 271 is provided to lead the reductant to a pump 230 from the container 205.
  • Said pump is arranged to draw the reductant from the container via the first line 271 and supply it via a second line 272 to a dosing unit 250.
  • the pump is arranged to pressurise the reductant in the second line 272.
  • the dosing unit 250 is adapted to supplying said reductant to an exhaust system of the vehicle 100. More specifically, it is adapted to supplying a vehicle.
  • an SCR catalyst (not depicted) is situated downstream of a location where the reductant supply is effected.
  • the amount of reductant supplied in the exhaust system is intended to be used in a conventional way in the SCR catalyst in order to reduce the amount of undesirable emissions.
  • a third line 273 runs between the dosing device 250 and the container 205 and is adapted to leading back to the container a certain amount of the reductant which is fed to the dosing unit 250.
  • a first fluid line 281 is provided to hold and convey a fluid.
  • Said fluid is a warming medium. It may be radiator liquid for an engine (not depicted) of the vehicle 100.
  • the first fluid line is partly situated in the container 205 to warm the reductant present therein.
  • the first fluid line is partly situated in the container in order, where appropriate, to melt the reductant therein by energy transfer.
  • the first fluid line in this example is arranged to lead radiator liquid which has been warmed by the vehicle's engine in a closed loop through the container, via the pump 230 and a second fluid line 282 back to the vehicle's engine.
  • a separate pump is provided, e.g. a pump for the engine's radiator liquid.
  • the fluid need not be circulated by the pump 230, which may also be called feed means or circulation pump.
  • Said pump may be of any suitable kind. It may be a diaphragm pump. It may in one version be warmed by a circulating warming medium.
  • the first line 271 may for example be arranged to warm the pump 230 downstream of said container 205.
  • the pump may be warmed by a circulating medium supplied by equipment intended for the purpose.
  • the first fluid line 281 is partly configured as a coil running round said first line 271 and said third line 273 in the container 205, as warming or melting of the reductant in the container.
  • the first fluid line may alternatively be of some other suitable shape, e.g. a U shape.
  • a first heating element 261 is provided adjacent to the second line 272 to warm as necessary the reductant present therein.
  • a second heating element is provided adjacent to the second line 272 to warm as necessary the reductant present therein.
  • a third heating element is provided adjacent to the dosing valve 250 to warm as necessary both the dosing valve and the reductant present therein.
  • a third heating element is provided adjacent to the dosing valve 250 to warm as necessary both the dosing valve and the reductant present therein.
  • a heating element is provided at any suitable point in the subsystem 299.
  • a first control unit 200 is provided to control appropriately the operation of said first heating element 261 , said second heating element 262 and said third heating element 263.
  • Said first control unit may be arranged to control the operation of said first heating element, said second heating element and said third heating element independently of one another.
  • the first control unit is arranged to activate and operate said heating elements when circulation of said reducing agent of the SCR system is deemed appropriate.
  • Said first control unit 200 is arranged for communication with a first temperature sensor 221 via a link L221.
  • Said first temperature sensor is adapted to detecting a prevailing temperature of the reductant where the sensor is fitted.
  • this first temperature sensor is situated in the immediate vicinity of the first and/or third lines in the container 205. In one version it is in the immediate vicinity of the first and/or third lines at the bottom of the container. In one version it is in a lower portion of the container.
  • the sensor is adapted to continuously sending signals which contain information about a prevailing temperature of the reductant to the first control unit via the link L221.
  • the first control unit 200 is arranged for communication with the pump 230 via a link L230.
  • the first control unit is adapted to controlling the operation of the pump in order for example to regulate the flows of reductant within the subsystem 299.
  • the first control unit is adapted to activating circulation of said reducing agent when this is deemed appropriate, according to one embodiment of the present invention.
  • the first control unit 200 is arranged for communication with the dosing unit 250 via a link L250.
  • the first control unit is adapted to controlling the operation of the dosing unit in order for example to regulate the supply of reductant to the exhaust system of the vehicle 100.
  • the first control unit is adapted to activating dosing of said reducing agent when this is deemed appropriate, according to one embodiment of the present invention.
  • a second control unit 2 0 is arranged for communication with the first control unit 200 via a link L210.
  • the second control unit may be detachably connected to the first control unit.
  • the second control unit may be a control unit external to the vehicle 100.
  • the second control unit may be adapted to performing the innovative method steps according to the invention. It may be used to cross-load software to the first control unit, particularly software for conducting the innovative method. It may alternatively be arranged for communication with the first control unit via an internal network on board the vehicle. It may be adapted to performing substantially similar functions to those of the first control unit.
  • the first control unit 200 is arranged to control the pump 230 in such a way that, where appropriate, at least part of said melted reductant is extracted from the elements 261 , 262 and 263 outside the container.
  • the first control unit is further adapted to controlling the pump in such a way that the melted portion of said reductant is led back to the container before its dosing by the dosing unit 250 commences in the SCR system.
  • FIG. 3 illustrates schematically part of the subsystem 299 described with reference to Figure 2. It omits some of the components described with reference to Figure 2.
  • Said first control unit 200 is arranged for communication with a second temperature sensor 222 via a link L222.
  • Said second sensor is adapted to continuously measuring a prevailing temperature T2 of said fluid upstream of said container 205.
  • Said second sensor is adapted to continuously sending signals containing information about the fluid's prevailing temperature to the first control unit via said link L222.
  • Said second sensor may be situated in the immediate upstream vicinity of the container or adjacent to the vehicle's engine or at a suitable location between said engine and said container.
  • Said first control unit 200 is arranged for communication with a third temperature sensor 223 via a link L223.
  • Said third sensor is adapted to continuously measuring a prevailing temperature T3 of said fluid downstream of said container 205.
  • Said third sensor is adapted to continuously sending signals containing information about the fluid's prevailing temperature to the first control unit via said link L223.
  • Said third sensor may be situated in the downstream immediate vicinity of the container or adjacent to the vehicle's engine or at a suitable location between said engine and said container. In one example said third temperature sensor may be adjacent to the pump 230.
  • said first control unit 200 is arranged to communicate with said temperature sensors via said second control unit 210, which may be signal- Said first line 281 is arranged to lead a warming fluid for melting of frozen reducing agent in the container 205.
  • said first line is connected to a system which is adapted to cooling an engine of the vehicle. During said cooling of the engine, thermal energy is transferred from said engine to said fluid.
  • said fluid is a radiator liquid of an engine cooling system.
  • said pump 230 is arranged to circulate said fluid from the engine to the container and back to the engine via the line 282 in a closed loop. It should be noted that said reducing agent and said warming fluid never mix but are physically separated by said lines.
  • a warming medium external to the vehicle may be used, in which case a separate container with a warming medium may be used and be connected to a circulation line present in the vehicle. This makes it possible to use for circulation of said warming fluid either a feed device external to the vehicle or a feed device intended for the purpose on board the vehicle.
  • the first control unit 200 is arranged in one version to use the signals received which represent a prevailing temperature T1 of the reductant in the region of the temperature sensor 221 and a prevailing temperature T2 of the fluid upstream of said container 205 as a basis for controlling the operation of the pump 230 and the dosing unit 250 in accordance with the innovative method.
  • the first control unit is arranged in one version to use the signals received which represent a prevailing temperature T1 of the reductant in the region of the temperature sensor 221 and a prevailing temperature T2 of the fluid upstream of said container 205 as a basis for determining a temperature difference between them in accordance with one aspect of the innovative method.
  • the first control unit is arranged in one version to use the signals received which represent a prevailing temperature T3 of the fluid downstream of said container 205 and a prevailing temperature T2 of the fluid upstream of said container as a basis for determining a temperature difference between them in accordance with one aspect of the innovative method.
  • Figure 4a is a schematic flowchart of a method, pertaining to an SCR system provided with a circulation pump 230 and a dosing unit 250, for not only assessing the need to warm reducing agent for exhaust cleaning which is present in a container 205 by means of a warming medium which circulates through said container, but for assessing also whether starting up of circulation of said reducing agent in said SCR system is appropriate in response to such warming, according to one embodiment of the invention.
  • the method comprises a first step s401 comprising the steps of:
  • FIG. 4b is a schematic flowchart of a method pertaining to an SCR system provided with a circulation pump 230 and a dosing unit 250, for not only present in a container 205 by means of a warming medium which circulates through said container, but for assessing also whether starting up of circulation of said reducing agent in said SCR system is appropriate in response to such warming, according to an embodiment of the invention.
  • the method comprises a first step s410 comprising the step of determining whether reducing agent present in the container 205 is at least partly frozen. This may be achieved by measuring the temperature of the reducing agent by means of the first temperature sensor 221. It may alternatively be achieved by taking account of an ambient temperature determined at the time of switching the vehicle off and/or an ambient temperature at the time of starting the vehicle up. Step s410 comprises the step, if reducing agent present in the container is at least partly frozen, of continuously determining a temperature T1 of said reducing agent in said container. Step s410 is followed by a step s420.
  • Method step s420 comprises the step of continuously determining a difference between a temperature T2 of said warming medium and the temperature T1 of said reducing agent in said container 205, or
  • Step s420 is followed by a step s430.
  • Method step s430 comprises the step of continuously determining an accumulated amount of energy transferred to said reducing agent based on either of said temperature differences during said warming. This may be effected by continuous integration of estimated amounts of energy transferred from said warming medium to said reducing agent in the container. Said estimated amounts of energy transferred may be based on said temperature differences determined (T1-T2, T3-T2) multiplied by a constant may be a suitable value and be based on the characteristics of said reducing agent.
  • Step s430 is followed by a step s440.
  • Method step s440 comprises the step of continuously determining a accumulated amount of melted reducing agent based on said temperature difference, as a basis for determining the appropriateness of said starting up. It may comprise the step of determining said accumulated amount of melted reducing agent based on said accumulated amount of energy transferred and the reducing agent's melting enphalpy. Steps s420, s430 and s440 are conducted until it is deemed appropriate to start up the pump 230. Step s440 is followed by a step s450.
  • Method step s450 may comprise the step, when starting the pump 230 for circulation of said reducing agent is deemed appropriate, of starting the pump to do so. In one embodiment example it is deemed appropriate to start the pump when a predetermined first amount of reducing agent has thawed. Said first amount of reducing agent may be any suitable amount, e.g. 2, 5 or 10 litres. Step s450 may comprise the step of reducing agent being warmed by the heating elements 261 , 262 and/or 263. Step s450 is followed by a step s460.
  • Method step s460 may comprise the step, after it has been deemed to be appropriate, of starting dosing of reducing agent by means of said dosing unit 250 according to operating routines stored in the first control unit. In one embodiment example it is deemed appropriate to start the dosing unit when a predetermined second amount of reducing agent has thawed. Said second amount of reducing agent may be any suitable amount, e.g. 12, 15 or 20 litres.
  • the method ends after step s460.
  • Figure 5 is a diagram of one version of a device 500.
  • the control units 200 and 210 described with reference to Figure 2 may in one version comprise the device 500.
  • the device 500 comprises a non-volatile memory 520, a data processing unit 510 and a read/write memory 550.
  • the non-volatile memory 520 has a first memory element 530 in which a computer programme, e.g. an operating system, is stored for controlling the function of the device 500.
  • the device 500 further comprises a bus controller, a serial communication port, I/O means, an A/D converter, a time and date input and transfer unit, an event counter and an interruption controller (not depicted).
  • the non-volatile memory 520 has also a second memory element 540.
  • a proposed computer programme P comprises routines for not only assessing the need to warm reducing agent for exhaust cleaning which is present in a container by means of a warming medium which circulates through said container, but also for assessing whether starting up of circulation of said reducing agent in said SCR system is appropriate in response to such warming.
  • the computer programme P comprises routines for continuously determining a temperature of said reducing agent in said container. It comprises routines for determining whether reducing agent present in the container is at least partly frozen. It comprises routines for continuously determining a difference between a temperature of said warming medium and the temperature of said reducing agent in said container. Alternatively, it comprises routines for continuously determining a difference between the temperature of said warming medium upstream of said container and a temperature of said warming medium downstream of said container. It comprises routines for continuously determining an accumulated amount of melted reducing agent based on said temperature difference, as a basis for determining the appropriateness of said starting up.
  • It comprises routines for continuously determining an accumulated amount of energy transferred to said reducing comprises routines for determining said accumulated amount of melted reducing agent based on said accumulated amount of energy transferred and the reducing agent's melted enthalpy. It comprises routines for assessing that it is appropriate to start up said circulation pump when a certain accumulated amount of melted reducing agent is determined. It comprises routines for starting dosing of said reducing agent at a certain accumulated amount of melted reducing agent.
  • the programme P may be stored in an executable form or in compressed form in a memory 560 and/or in a read/write memory 550.
  • the data processing unit 510 is described as performing a certain function, it means that it conducts a certain part of the programme stored in the memory 560 or a certain part of the programme stored in the read/write memory 550.
  • the data processing device 510 can communicate with a data port 599 via a data bus 515.
  • the non-volatile memory 520 is intended for communication with the data processing unit 510 via a data bus 512.
  • the separate memory 560 is intended to communicate with the data processing unit 510 via a data bus 511.
  • the read/write memory 550 is adapted to communicating with the data processing unit 510 via a data bus 514.
  • the data port 599 may for example have the links L210, L221 , L222 and L223 connected to it (see Figure 2 and Figure 3).
  • signals received on the data port 599 contain information about a prevailing temperature T1 of the reducing agent in the container 205.
  • signals received on the warming medium upstream of the container In one version signals received on the data port contain information about a prevailing temperature T2 of said warming medium downstream of the container.
  • Parts of the methods herein described may be conducted by the device 500 by means of the data processing unit 510 which runs the programme stored in the memory 560 or the read/write memory 550. When the device 500 runs the programme, methods herein described are executed.

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)

Abstract

L'invention concerne un procédé s'appliquant à un système permettant d'évaluer s'il y a besoin de chauffer un agent réducteur pour épurer les gaz d'échappement présents dans un contenant (205) au moyen d'un milieu chauffant qui est mis en circulation dans ledit contenant (205), et pour évaluer si la mise en circulation dudit agent réducteur du système SCR est appropriée en réaction à ce chauffage. Le procédé peut déterminer en continu la température (T1) de l'agent réducteur dans le contenant (s401), la différence entre cette température et soit la température (T2) du milieu chauffant, soit la température (T3) du milieu chauffant en aval du contenant (205) (s420). Ce procédé peut également déterminer en continu (s440) une quantité accumulée d'agent réducteur fondu en fonction de la différence de température, telle qu'une base pour déterminer le caractère approprié de la mise en route. L'invention concerne également un produit programme d'ordinateur comprenant un code de programme (P) d'un ordinateur (200 ; 210) permettant de mettre en œuvre un procédé conformément à l'invention. L'invention concerne aussi un système SCR et un véhicule à moteur équipé de ce système.
PCT/SE2013/051064 2012-09-17 2013-09-12 Système scr et procédé pour déterminer de manière fiable si une pompe à circulation pour agent réducteur peut être mise en route en toute sécurité WO2014042583A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112013004168.5T DE112013004168B4 (de) 2012-09-17 2013-09-12 SCR-System und Verfahren zur zuverlässigen Bestimmung, ob eine Umlaufpumpe für ein Reduktionsmittel sicher gestartet werden kann

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SE1251035-0 2012-09-17
SE1251035A SE538382C2 (sv) 2012-09-17 2012-09-17 Förfarande för värmning av ett reduktionsmedel i ett SCR-system och bestämning av lämplighet avseende cirkulation av nämnda reduktionsmedel i nämnda SCR-system

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WO2015088428A1 (fr) * 2013-12-09 2015-06-18 Scania Cv Ab Procédé et dispositif de décongélation d'un agent réducteur congelé dans un système scr
WO2016200307A1 (fr) * 2015-06-09 2016-12-15 Scania Cv Ab Procédé et système permettant de déterminer un volume d'un liquide dans un récipient sur la base d'une vitesse de changement de température moyenne
FR3059417A1 (fr) * 2016-11-30 2018-06-01 Plastic Omnium Advanced Innovation And Research Methode d'estimation d'un volume decongele present sous forme liquide dans un reservoir.
CN109268113A (zh) * 2018-09-29 2019-01-25 潍柴动力股份有限公司 一种校准方法、装置及尿素供给喷射系统
WO2019059831A1 (fr) * 2017-09-22 2019-03-28 Scania Cv Ab Système et procédé pour déterminer un démarrage sûr d'une configuration de fourniture d'agent réducteur
CN114072571A (zh) * 2019-07-18 2022-02-18 株式会社小松制作所 预测装置、预测方法以及工作车辆

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WO2015088428A1 (fr) * 2013-12-09 2015-06-18 Scania Cv Ab Procédé et dispositif de décongélation d'un agent réducteur congelé dans un système scr
WO2016200307A1 (fr) * 2015-06-09 2016-12-15 Scania Cv Ab Procédé et système permettant de déterminer un volume d'un liquide dans un récipient sur la base d'une vitesse de changement de température moyenne
FR3059417A1 (fr) * 2016-11-30 2018-06-01 Plastic Omnium Advanced Innovation And Research Methode d'estimation d'un volume decongele present sous forme liquide dans un reservoir.
WO2018100087A1 (fr) * 2016-11-30 2018-06-07 Plastic Omnium Advanced Innovation And Research Methode d'estimation d'un volume decongele present sous forme liquide dans un reservoir
CN109964103A (zh) * 2016-11-30 2019-07-02 全耐塑料高级创新研究公司 用于估计以液态存在于储箱中的解冻体积的方法
US10975751B2 (en) 2016-11-30 2021-04-13 Plastic Omnium Advanced Innovation And Research Method for estimating a thawed volume present in liquid form in a tank
WO2019059831A1 (fr) * 2017-09-22 2019-03-28 Scania Cv Ab Système et procédé pour déterminer un démarrage sûr d'une configuration de fourniture d'agent réducteur
CN109268113A (zh) * 2018-09-29 2019-01-25 潍柴动力股份有限公司 一种校准方法、装置及尿素供给喷射系统
CN114072571A (zh) * 2019-07-18 2022-02-18 株式会社小松制作所 预测装置、预测方法以及工作车辆

Also Published As

Publication number Publication date
SE1251035A1 (sv) 2014-03-18
DE112013004168B4 (de) 2023-03-30
SE538382C2 (sv) 2016-06-07
DE112013004168T5 (de) 2015-05-13

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