US20130032214A1 - Purge phase control strategy for a selected catalytic reduction system - Google Patents
Purge phase control strategy for a selected catalytic reduction system Download PDFInfo
- Publication number
- US20130032214A1 US20130032214A1 US13/640,423 US201113640423A US2013032214A1 US 20130032214 A1 US20130032214 A1 US 20130032214A1 US 201113640423 A US201113640423 A US 201113640423A US 2013032214 A1 US2013032214 A1 US 2013032214A1
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- United States
- Prior art keywords
- purge
- pump
- reducing agent
- catalytic reduction
- reduction system
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Classifications
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0031—Degasification of liquids by filtration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
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- 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
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/0318—Processes
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/85978—With pump
Definitions
- the present invention relates to a purge control method for a selective catalytic reduction system for a vehicle.
- the selective catalytic reduction (or SCR) systems have the purpose of reducing the nitrogen oxides (NO x ) contained in the exhaust gases.
- the SCR system uses a chemical reaction between said NO and a reducing agent.
- the reducing agent is ammonia (NH 3 ).
- the ammonia is injected into the exhaust line for the gases.
- the injection of ammonia can be carried out through the intermediary of another chemical species such as urea.
- the currently available decontamination systems require an SCR system that can bring the reducing agent to the injector under adequate injection conditions.
- An example of an SCR system is presented in FIG. 1 .
- the SCR system 1 consists of one or more reservoirs 2 for storing the reducing agent 3 , a pump 4 , one or more lines 5 , and an injector 6 .
- the line 5 can be a heating line.
- the reservoirs 2 also have a level sensor 7 , a temperature sensor 8 , and at least one heating element 9 .
- the line 5 makes it possible to bring the reducing agent 3 into the exhaust line 10 of the vehicle before the catalyst 11 of the SCR system 1 .
- the lines 5 , the injector 6 and/or the pump 4 can be drained of their reducing agent 3 .
- the purging of the reducing agent 3 makes it possible avoid damage in the case of a freeze when the vehicle is not in use.
- the reducing agent 3 contained in these components is returned to the reservoir 2 and replaced with a purge fluid (air or exhaust gas).
- This purge method can be carried out, for example, by causing the pump 4 to rotate in the opposite direction, and by opening a suction device.
- the suction device can be the injector 6 in order to replace the reducing agent 3 with the exhaust gases.
- a phase of operation starts in which the computer of the engine and the actuators of the power train are kept supplied by the battery as long as needed to carry out the required recordings, updates and post-cooling phase.
- the purge phase is carried out during this phase of operation referred to as the power latch phase.
- This power latch phase can be as short as possible to avoid major short circuits.
- the document FR-A-2 921 105 describes a purge procedure that includes the sequential activation and/or deactivation of the operation of the pump and of the suction device. However, the document does not describe a method that makes it possible to minimize the power latch phase.
- a purge control method for a selective catalytic reduction system for a vehicle has a pump for a reducing agent, at least one line for supplying reducing agent to an exhaust line of the vehicle, and a device for suctioning purge fluid.
- the method includes determining a purge duration as a function of a filling state of the supply line before the activation of the purge, and in updating of the estimated purge duration during the purge.
- the filling state of the supply line is determined by the percentage or the volume of reducing agent contained in the reducing agent supply line.
- the updating of the purge duration is a function of the state of contact of the pump with the air and/or of the pressure at the outlet of the pump.
- the state of contact of the pump with the air is determined by a measurement of the current consumed by the pump.
- the method additionally includes:
- the data being the purge duration, the measurement of the current consumed by the pump, and the measurement of the pressure at the outlet of the pump, and
- the determination of the purge duration is also a function of the pressure at the device for suctioning purge fluid
- the purge of the selective catalytic reduction system is activated as a function of at least one of the parameters selected from the group consisting of the temperature in the exhaust line of the vehicle, the filling level of a reducing agent reservoir, and combinations thereof.
- the method additionally includes the calculation of the filling state of the supply line throughout the entire purge, and the recording of the filling state of the line when the purge is deactivated.
- an activation of the purge includes the sequential activation of the pump and of the suction device.
- a deactivation of the purge includes the sequential deactivation of the pump and of the suction device.
- the activation or deactivation sequence of the pump and of the suction device is predetermined.
- the suction device is a reducing agent injector or a valve.
- a selective catalytic reduction (SCR) system for a vehicle includes a reducing agent pump, at least one line for supplying reducing agent to an exhaust line of the vehicle, and a device for suctioning purge fluid, wherein the SCR system includes a controller which uses the above-described method.
- a vehicle that includes an exhaust line, wherein the vehicle includes the just-noted selective catalytic reduction system.
- FIG. 1 already described, shows an example of an SCR system
- FIG. 2 is an explanatory diagram of an example of a method according to the invention.
- a purge control method for a selective catalytic reduction system 1 for a vehicle is provided.
- the SCR system 1 has a pump 4 for a reducing agent 3 , at least one line 5 for supplying reducing agent to an exhaust line 10 of the vehicle, and a device for suctioning purge fluid.
- the method of the invention includes the determination of a purge duration as a function of a filling state of the supply line 5 before the activation of the purge.
- the method further includes the updating of the purge duration during the purge.
- the filling of the supply line 5 is the percentage or volume of reducing agent 3 contained inside the line 5 . This can be determined as a function of the number of rotations of the pump or of its duration of operation.
- the suction device can be an injector 6 for reducing agent 3 in the exhaust line 10 of the vehicle.
- the purge fluid is then comprised of the exhaust gases of the vehicle.
- the suction device can be a valve which sucks in air as the purge fluid. The valve is supported, for example, by the injector 6 .
- the purge control method makes it possible to control the purge of an SCR system with highly precise management of voltage application to the computers and actuators required for this purge to take place.
- the method makes it possible to obtain a power latch phase duration which is as short as possible in order to avoid major short circuits and minimize the power consumption of the vehicle.
- the method allows a generic control of the safety of the supply lines, while avoiding the risks caused by an excessively long power latch duration.
- the purge control method makes it possible to manage the purge of several types of SCR systems.
- the method can be used in the presence or absence of a pressure sensor at the outlet of the pump 4 , at the outlet of the supply line 5 , or at the injector 6 in the exhaust line 10 of the vehicle.
- the method is suitable for SCR systems 1 having different positions of the SCR catalyst 11 in the exhaust line 10 .
- the method is suitable for an SCR system 1 which uses air or the exhaust gas as the purge fluid.
- the method is advantageously used in an SCR system which has no pressure sensor.
- FIG. 2 The steps of the method according to the invention will be better understood in reference to FIG. 2 .
- the figure describes an example of the method which is used by a supervisor or controller of the SCR system 1 , and in which the suction device is the injector 6 .
- FIG. 2 has, on the three time axes, the respective states of the engine of the vehicle, of the controller of the SCR system 1 , and of the actuators used during the purge.
- the controller maintains the SCR system under pressure.
- the pump 4 and the injector 6 for the reducing agent 3 are activated.
- reference 14 indicates a stop in the application of a voltage to the engine, which implies a preactivated need for a purge.
- the stop of the engine indicates the need for a purge.
- the contact key does not indicate a stop in the power supply to the vehicle (the contact key can be in the “accessories” position in one vehicle example)
- the purge authorization process is triggered after a prolonged engine stop (possibly based on the temperature at the exhaust).
- the purge authorization process can be triggered by shut off by key, that is to say a position of the key indicating a stop in the power supply to the vehicle.
- the shut-off by key then confirms the need for a purge, which is preactivated by the stopping of the engine. If the need for a purge is confirmed, the control method proceeds to the next step. A lack of heating can also preactivate a need for a purge.
- step B the controller requests maintenance of the engine state in the power latch phase, and then switches to standby.
- the pump 4 and the injector 6 are on standby.
- step C the purge of the SCR system 1 is authorized at a time calculated according to reference no. 12 .
- Reference no. 12 corresponds to an examination of the temperature at the exhaust, of the filling of the reservoir 2 , or of the supply line 5 , in order to calculate the time of authorization of the purge.
- the purge is authorized as a function of parameters of the SCR system 1 acquired based on the stopping of the engine.
- the purge can be authorized as a function of the filling level of the reservoir 2 of reducing agent 3 , or of the filling of the supply line 5 upon stopping of the engine. If these components have no reducing agent 3 , the control method does not proceed to the purge.
- the purge can also be authorized as a function of the conditions in the exhaust line 10 of the vehicle, for example, the temperature of the exhaust gases. This is particularly the case when the suction device is the injector 6 of the SCR system.
- the purge can then be activated when the temperature of the exhaust gases is sufficiently low so that the components (line 5 , pump 4 , sensors 7 , 8 ) of the SCR system 1 are not damaged.
- step D the pump 4 and the injector 6 are activated sequentially.
- the order of activation can be predetermined or can be selected at the time of the implementation of the method.
- step E the pump 4 and the injector 6 have been activated, and the counting of the purge duration starts.
- the purge duration is estimated according to reference no. 13 .
- Reference no. 13 corresponds to an examination of the pressure at the exhaust, of the capacity of the pump 4 , or of the filling of the supply line 5 , in order to estimate the purge duration.
- the purge duration (or timing) is determined as a function of parameters of the SCR system 1 and/or of the vehicle acquired before the activation of the purge.
- the purge duration can be determined as a function of the length of the supply line 5 .
- the purge duration can be determined as a function of the filling state of the supply line 5 before the activation of the purge.
- the purge duration can also be a function of the pressure at the purge fluid suction device.
- the purge duration can be a function of the pressure at the exhaust, that is to say at the injector 6 in the exhaust line 10 .
- the pressure can be determined using a sensor in the vicinity of the injector 6 , using a model associated with the sensors positioned in the exhaust line 10 a distance from the injector 10 , or using a model of the engine of the vehicle.
- the purge duration can be a function of the atmospheric pressure.
- the purge duration can also be a function of the capacity of the pump 4 .
- Step F takes place during the purge of the SCR system 1 , and comprises performing the synthesis of the timing.
- This comprises updating the purge duration.
- the updating of the purge duration can be a function of the state of contact of the pump 4 with the air (or more generally the state of contact with the purge fluid) and potentially of pressure data at the output of the pump 4 .
- the state of contact of the pump 4 with the air can be determined using a measurement of the current consumed by the pump 4 . Indeed, the resistance to suction of the purge fluid is different from that of the reducing agent. As a result, there is a difference in the consumption of the pump 4 .
- These update data can be combined.
- the purge duration can be updated on the basis of other parameters of the SCR 1 system and/or of the vehicle, such as the pressure in the supply line 5 .
- the method additionally includes the determination of the consistency between two of the three pieces of data, which are the purge duration, the measurement of the current consumed by the pump 4 , and the measurement of the pressure at the outlet of the pump 4 .
- a diagnosis of the state of operation of the elements of the SCR system 1 can be carried out. For example, if, after the elapse of the maximum estimated purge duration, the pressure corresponds to that of the air, but the current of the pump 4 is high, one can deduce therefrom that the purge has failed (due to the pump 4 or due to a blocked suction device; other causes are possible; they depend on the choice of components of the SCR system).
- step G the pump 4 and the injector 6 are deactivated sequentially.
- the deactivation order can be predetermined, or selected at the time of the implementation of the method.
- step H the controller, the pump 4 , and the injector 6 are on standby.
- the method can include the calculation of the filling state of the supply line 5 throughout the entire purge, and the recording in step H of the filling state of the line 5 as soon as the purge is deactivated.
- a deactivation may be due to the fact that the purge duration has reached its end.
- the deactivation can be an abrupt interruption of the purge before the end of the purge duration.
- the abrupt interruption of the purge can occur following the introduction of the contact key by a user of the vehicle, a restart of the engine of the vehicle, a shortened duration of the power latch phase, or because of a dysfunction of one of the actuators performing the purge.
- the method proceeds directly to step H, regardless of what the ongoing step of the method is.
- the recorded filling state can be used for the implementation of a subsequent priming procedure allowing the filling of the SCR system 1 with the reducing agent 3 .
- step I once all the previous operations have been carried out, the controller deactivates the maintenance of the engine in the power latch phase.
- step C the purge of the SCR system 1 is authorized at a time which is calculated according to reference no. 12 .
- Reference no. 12 corresponds to an examination of the filling of the reservoir 2 , or of the supply line 5 , in order to calculate the time of authorization of the purge.
- the purge can be authorized as a function of the filling level of the reservoir 2 of reducing agent 3 , or of the filling of the supply line 5 , acquired on the basis of the stopping of the engine.
- the purge authorization is not obtained on the basis of the conditions in the exhaust line 10 of the vehicle.
- the purge duration is estimated according to reference no. 13 .
- Reference no. 13 corresponds to an examination of the atmospheric pressure, of the capacity of the pump 4 , or of the filling of the supply line 5 , in order to estimate the purge duration (or timing).
- the purge duration can be a function of the filling state of the supply line 5 , or of the atmospheric pressure acquired before the activation of the purge.
- the invention further relates to a selective catalytic reduction system 1 for a vehicle, that includes a controller that uses the method according to the invention.
- the SCR system according to the invention has the above-described characteristics.
- the invention further relates to a vehicle that includes a catalytic reduction system according to the invention.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The method according to the invention is a method for controlling the purging of a sélective catalytic réduction System (1) for a vehicle. The sélective catalytic réduction System (1) has a pump (4) for reducing agent (3), at least one supply line (5) supplying reducing agent (3) to an exhaust line (10) of the vehicle, and a purge fluid suction device. The method is characterized in that it involves determining a purge duration as a fonction of a state of fill of the supply line (5) prior to activation of the purge phase, and in that the method forther comprises the updating of the purge duration during purging.
Description
- The present application is the US National Stage under 35 U.S.C.§371 of International Application No. PCT/FR2011/050573, filed Mar. 21, 2011, and which claims priority to French Application No. 1052814 filed Apr. 13, 2010, the content (text, drawings and claims) of which is incorporated here by reference.
- The present invention relates to a purge control method for a selective catalytic reduction system for a vehicle.
- In the context of decontamination of the exhaust gases of a diesel engine, the selective catalytic reduction (or SCR) systems have the purpose of reducing the nitrogen oxides (NOx) contained in the exhaust gases. The SCR system uses a chemical reaction between said NO and a reducing agent. Conventionally, the reducing agent is ammonia (NH3). The ammonia is injected into the exhaust line for the gases. The injection of ammonia can be carried out through the intermediary of another chemical species such as urea.
- The currently available decontamination systems require an SCR system that can bring the reducing agent to the injector under adequate injection conditions. An example of an SCR system is presented in
FIG. 1 . TheSCR system 1 consists of one or more reservoirs 2 for storing the reducingagent 3, apump 4, one ormore lines 5, and aninjector 6. Theline 5 can be a heating line. The reservoirs 2 also have alevel sensor 7, a temperature sensor 8, and at least oneheating element 9. Theline 5 makes it possible to bring the reducingagent 3 into theexhaust line 10 of the vehicle before the catalyst 11 of theSCR system 1. At the end of each run (operation of the vehicle), thelines 5, theinjector 6 and/or the pump 4 (or a portion thereof) can be drained of their reducingagent 3. Thus, when these components are sensitive to cold, the purging of the reducingagent 3 makes it possible avoid damage in the case of a freeze when the vehicle is not in use. During the purge phase, the reducingagent 3 contained in these components is returned to the reservoir 2 and replaced with a purge fluid (air or exhaust gas). This purge method can be carried out, for example, by causing thepump 4 to rotate in the opposite direction, and by opening a suction device. The suction device can be theinjector 6 in order to replace the reducingagent 3 with the exhaust gases. - In a vehicle, after being shut off by key, a phase of operation starts in which the computer of the engine and the actuators of the power train are kept supplied by the battery as long as needed to carry out the required recordings, updates and post-cooling phase. The purge phase is carried out during this phase of operation referred to as the power latch phase. This power latch phase can be as short as possible to avoid major short circuits.
- The document FR-A-2 921 105 describes a purge procedure that includes the sequential activation and/or deactivation of the operation of the pump and of the suction device. However, the document does not describe a method that makes it possible to minimize the power latch phase.
- Thus, there is a need for a method for controlling the purge phase that makes it possible to minimize the power latch phase.
- For this purpose, a purge control method for a selective catalytic reduction system for a vehicle is disclosed. The selective catalytic reduction system has a pump for a reducing agent, at least one line for supplying reducing agent to an exhaust line of the vehicle, and a device for suctioning purge fluid. The method includes determining a purge duration as a function of a filling state of the supply line before the activation of the purge, and in updating of the estimated purge duration during the purge.
- According to a variant, the filling state of the supply line is determined by the percentage or the volume of reducing agent contained in the reducing agent supply line.
- According to a variant, the updating of the purge duration is a function of the state of contact of the pump with the air and/or of the pressure at the outlet of the pump.
- According to a variant, the state of contact of the pump with the air is determined by a measurement of the current consumed by the pump.
- According to a variant, the method additionally includes:
- determining the consistency between two of three pieces of data, the data being the purge duration, the measurement of the current consumed by the pump, and the measurement of the pressure at the outlet of the pump, and
- performing a diagnosis on the state of operation of the elements of the selective catalytic reduction system.
- According to a variant, the determination of the purge duration is also a function of the pressure at the device for suctioning purge fluid
- According to a variant, the purge of the selective catalytic reduction system is activated as a function of at least one of the parameters selected from the group consisting of the temperature in the exhaust line of the vehicle, the filling level of a reducing agent reservoir, and combinations thereof.
- According to a variant, the method additionally includes the calculation of the filling state of the supply line throughout the entire purge, and the recording of the filling state of the line when the purge is deactivated.
- According to a variant, an activation of the purge includes the sequential activation of the pump and of the suction device.
- According to a variant, a deactivation of the purge includes the sequential deactivation of the pump and of the suction device.
- According to a variant, the activation or deactivation sequence of the pump and of the suction device is predetermined.
- According to a variant, the suction device is a reducing agent injector or a valve.
- A selective catalytic reduction (SCR) system for a vehicle is also disclosed that includes a reducing agent pump, at least one line for supplying reducing agent to an exhaust line of the vehicle, and a device for suctioning purge fluid, wherein the SCR system includes a controller which uses the above-described method.
- In addition, a vehicle is disclosed that includes an exhaust line, wherein the vehicle includes the just-noted selective catalytic reduction system.
- Other characteristics and advantages of the method will become apparent when reading the following detailed description of the embodiments, which are given only as examples and in reference to the drawings which show:
-
FIG. 1 , already described, shows an example of an SCR system, and -
FIG. 2 is an explanatory diagram of an example of a method according to the invention. - A purge control method for a selective
catalytic reduction system 1 for a vehicle is provided. According toFIG. 1 , theSCR system 1 has apump 4 for a reducingagent 3, at least oneline 5 for supplying reducing agent to anexhaust line 10 of the vehicle, and a device for suctioning purge fluid. The method of the invention includes the determination of a purge duration as a function of a filling state of thesupply line 5 before the activation of the purge. The method further includes the updating of the purge duration during the purge. - As set forth below, the filling of the
supply line 5 is the percentage or volume of reducingagent 3 contained inside theline 5. This can be determined as a function of the number of rotations of the pump or of its duration of operation. The suction device can be aninjector 6 for reducingagent 3 in theexhaust line 10 of the vehicle. The purge fluid is then comprised of the exhaust gases of the vehicle. Alternatively, the suction device can be a valve which sucks in air as the purge fluid. The valve is supported, for example, by theinjector 6. - The purge control method makes it possible to control the purge of an SCR system with highly precise management of voltage application to the computers and actuators required for this purge to take place. Thus, the method makes it possible to obtain a power latch phase duration which is as short as possible in order to avoid major short circuits and minimize the power consumption of the vehicle. The method allows a generic control of the safety of the supply lines, while avoiding the risks caused by an excessively long power latch duration.
- The purge control method makes it possible to manage the purge of several types of SCR systems. The method can be used in the presence or absence of a pressure sensor at the outlet of the
pump 4, at the outlet of thesupply line 5, or at theinjector 6 in theexhaust line 10 of the vehicle. The method is suitable forSCR systems 1 having different positions of the SCR catalyst 11 in theexhaust line 10. The method is suitable for anSCR system 1 which uses air or the exhaust gas as the purge fluid. The method is advantageously used in an SCR system which has no pressure sensor. - The steps of the method according to the invention will be better understood in reference to
FIG. 2 . The figure describes an example of the method which is used by a supervisor or controller of theSCR system 1, and in which the suction device is theinjector 6.FIG. 2 has, on the three time axes, the respective states of the engine of the vehicle, of the controller of theSCR system 1, and of the actuators used during the purge. - During the operation of the vehicle, the engine turns, the controller maintains the SCR system under pressure. The
pump 4 and theinjector 6 for the reducingagent 3 are activated. - In step A,
reference 14 indicates a stop in the application of a voltage to the engine, which implies a preactivated need for a purge. In other words, the stop of the engine (stop in the application of a voltage to the engine) indicates the need for a purge. If the contact key does not indicate a stop in the power supply to the vehicle (the contact key can be in the “accessories” position in one vehicle example), the purge authorization process is triggered after a prolonged engine stop (possibly based on the temperature at the exhaust). Alternatively, the purge authorization process can be triggered by shut off by key, that is to say a position of the key indicating a stop in the power supply to the vehicle. The shut-off by key then confirms the need for a purge, which is preactivated by the stopping of the engine. If the need for a purge is confirmed, the control method proceeds to the next step. A lack of heating can also preactivate a need for a purge. - In step B, the controller requests maintenance of the engine state in the power latch phase, and then switches to standby. The
pump 4 and theinjector 6 are on standby. - In step C, the purge of the
SCR system 1 is authorized at a time calculated according to reference no. 12. Reference no. 12 corresponds to an examination of the temperature at the exhaust, of the filling of the reservoir 2, or of thesupply line 5, in order to calculate the time of authorization of the purge. In other words, the purge is authorized as a function of parameters of theSCR system 1 acquired based on the stopping of the engine. The purge can be authorized as a function of the filling level of the reservoir 2 of reducingagent 3, or of the filling of thesupply line 5 upon stopping of the engine. If these components have no reducingagent 3, the control method does not proceed to the purge. The purge can also be authorized as a function of the conditions in theexhaust line 10 of the vehicle, for example, the temperature of the exhaust gases. This is particularly the case when the suction device is theinjector 6 of the SCR system. The purge can then be activated when the temperature of the exhaust gases is sufficiently low so that the components (line 5, pump 4,sensors 7, 8) of theSCR system 1 are not damaged. - In step D, the
pump 4 and theinjector 6 are activated sequentially. The order of activation can be predetermined or can be selected at the time of the implementation of the method. - In step E, the
pump 4 and theinjector 6 have been activated, and the counting of the purge duration starts. The purge duration is estimated according to reference no. 13. Reference no. 13 corresponds to an examination of the pressure at the exhaust, of the capacity of thepump 4, or of the filling of thesupply line 5, in order to estimate the purge duration. In other words, the purge duration (or timing) is determined as a function of parameters of theSCR system 1 and/or of the vehicle acquired before the activation of the purge. The purge duration can be determined as a function of the length of thesupply line 5. In particular, the purge duration can be determined as a function of the filling state of thesupply line 5 before the activation of the purge. The purge duration can also be a function of the pressure at the purge fluid suction device. In the case where the suction device is theinjector 6, the purge duration can be a function of the pressure at the exhaust, that is to say at theinjector 6 in theexhaust line 10. The pressure can be determined using a sensor in the vicinity of theinjector 6, using a model associated with the sensors positioned in the exhaust line 10 a distance from theinjector 10, or using a model of the engine of the vehicle. In the case where the suction device is a valve, the purge duration can be a function of the atmospheric pressure. The purge duration can also be a function of the capacity of thepump 4. - Step F takes place during the purge of the
SCR system 1, and comprises performing the synthesis of the timing. This comprises updating the purge duration. The updating of the purge duration can be a function of the state of contact of thepump 4 with the air (or more generally the state of contact with the purge fluid) and potentially of pressure data at the output of thepump 4. In some pump technologies, the state of contact of thepump 4 with the air (or more generally with the purge fluid) can be determined using a measurement of the current consumed by thepump 4. Indeed, the resistance to suction of the purge fluid is different from that of the reducing agent. As a result, there is a difference in the consumption of thepump 4. These update data can be combined. The purge duration can be updated on the basis of other parameters of theSCR 1 system and/or of the vehicle, such as the pressure in thesupply line 5. - In one embodiment, the method additionally includes the determination of the consistency between two of the three pieces of data, which are the purge duration, the measurement of the current consumed by the
pump 4, and the measurement of the pressure at the outlet of thepump 4. On the basis of these parameters, a diagnosis of the state of operation of the elements of theSCR system 1 can be carried out. For example, if, after the elapse of the maximum estimated purge duration, the pressure corresponds to that of the air, but the current of thepump 4 is high, one can deduce therefrom that the purge has failed (due to thepump 4 or due to a blocked suction device; other causes are possible; they depend on the choice of components of the SCR system). - In step G, the
pump 4 and theinjector 6 are deactivated sequentially. The deactivation order can be predetermined, or selected at the time of the implementation of the method. - In step H, the controller, the
pump 4, and theinjector 6 are on standby. The method can include the calculation of the filling state of thesupply line 5 throughout the entire purge, and the recording in step H of the filling state of theline 5 as soon as the purge is deactivated. A deactivation may be due to the fact that the purge duration has reached its end. Alternatively, the deactivation can be an abrupt interruption of the purge before the end of the purge duration. The abrupt interruption of the purge can occur following the introduction of the contact key by a user of the vehicle, a restart of the engine of the vehicle, a shortened duration of the power latch phase, or because of a dysfunction of one of the actuators performing the purge. In the case of an abrupt interruption of the purge, the method proceeds directly to step H, regardless of what the ongoing step of the method is. - The recorded filling state can be used for the implementation of a subsequent priming procedure allowing the filling of the
SCR system 1 with the reducingagent 3. - In step I, once all the previous operations have been carried out, the controller deactivates the maintenance of the engine in the power latch phase.
- The method has been described for the example of a purge carried out by suctioning of the exhaust gases by the
injector 6. However, the method is also appropriate for a purge carried out by suctioning of air by means of a valve. When the suction device is a valve, steps A, B, D and F to I remain identical to those described above. In step C, the purge of theSCR system 1 is authorized at a time which is calculated according to reference no. 12. Reference no. 12 corresponds to an examination of the filling of the reservoir 2, or of thesupply line 5, in order to calculate the time of authorization of the purge. In other words, the purge can be authorized as a function of the filling level of the reservoir 2 of reducingagent 3, or of the filling of thesupply line 5, acquired on the basis of the stopping of the engine. The purge authorization is not obtained on the basis of the conditions in theexhaust line 10 of the vehicle. In step E, the purge duration is estimated according to reference no. 13. Reference no. 13 corresponds to an examination of the atmospheric pressure, of the capacity of thepump 4, or of the filling of thesupply line 5, in order to estimate the purge duration (or timing). In other words, the purge duration can be a function of the filling state of thesupply line 5, or of the atmospheric pressure acquired before the activation of the purge. - The invention further relates to a selective
catalytic reduction system 1 for a vehicle, that includes a controller that uses the method according to the invention. The SCR system according to the invention has the above-described characteristics. - The invention further relates to a vehicle that includes a catalytic reduction system according to the invention.
Claims (14)
1. A purge control method for a selective catalytic reduction system for a vehicle, the selective catalytic reduction system having a pump for a reducing agent, at least one line for supplying reducing agent to an exhaust line of the vehicle, and a device for suctioning purge fluid, the method comprising
determining a purge duration as a function of a filling state of the supply line before the activation of a purge of the selective catalytic reduction system, and updating of the purge duration during the purge.
2. The method according to claim 1 , wherein the filling state of the supply line is determined by the percentage or the volume of reducing agent contained in the supply line for the reducing agent.
3. The method according to claim 1 , wherein the updating of the purge duration is a function of the state of contact of the pump with the air and/or of the pressure at the outlet of the pump.
4. The method according to claim 3 , wherein the state of contact of the pump with the air is determined using a measurement of the current consumed by the pump.
5. The method according to claim 4 , wherein the method additionally includes:
determining the consistency between two of three pieces of data, the data comprising the purge duration, the measurement of the current consumed by the pump, and the measurement of the pressure at the outlet of the pump, and
performing a diagnosis on the state of operation of the elements of the selective catalytic reduction system.
6. The method according to claim 1 , wherein the step of determining the purge duration is also a function of the pressure at the device for suctioning purge fluid.
7. The method according to claim 1 , wherein the purge of the selective catalytic reduction system is activated as a function of at least one of the parameters selected from the temperature in the exhaust line of the vehicle or the filling level of a reservoir of reducing agent.
8. The method according to claim 1 , wherein the method additionally includes of calculating the filling state of the supply line throughout the entire purge, and recording of the filling state of the line when the purge is deactivated.
9. The method according to claim 1 , wherein an activation of the purge includes the sequential activation of the pump and of the suction device.
10. The method according to claim 1 , wherein a deactivation of the purge includes the sequential deactivation of the pump and of the suction device.
11. The method according to claim 9 , wherein the activation or deactivation sequence of the pump and of the suction device is predetermined.
12. The method according to claim 1 , wherein the suction device is an injector for the reducing agent or a valve.
13. A selective catalytic reduction system for a vehicle, the selective catalytic reduction system including a pump for a reducing agent, at least one line for supplying the reducing agent to an exhaust line of the vehicle, a device for suctioning purge fluid, and; the controller being adapted to determine a purge duration as a function of a filling state of the supply line before the activation of a purge of the selective catalytic reduction system, and to update the purge duration during the purge.
14. The selective catalytic reduction system according to claim 13 , wherein the selective catalytic reduction system is incorporated in a vehicle.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1052814A FR2958681B1 (en) | 2010-04-13 | 2010-04-13 | PURGE PHASE STEERING STRATEGY ON A SELECTIVE CATALYTIC REDUCTION SYSTEM |
FR1052814 | 2010-04-13 | ||
PCT/FR2011/050573 WO2011128542A1 (en) | 2010-04-13 | 2011-03-21 | Purge phase control strategy for a selected catalytic reduction system |
Publications (1)
Publication Number | Publication Date |
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US20130032214A1 true US20130032214A1 (en) | 2013-02-07 |
Family
ID=43383610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/640,423 Abandoned US20130032214A1 (en) | 2010-04-13 | 2011-03-21 | Purge phase control strategy for a selected catalytic reduction system |
Country Status (4)
Country | Link |
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US (1) | US20130032214A1 (en) |
EP (1) | EP2558693B1 (en) |
FR (1) | FR2958681B1 (en) |
WO (1) | WO2011128542A1 (en) |
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US20160348556A1 (en) * | 2015-05-29 | 2016-12-01 | Toyota Jidosha Kabushiki Kaisha | Reducing agent supply device |
US9670818B2 (en) | 2015-08-07 | 2017-06-06 | Caterpillar Inc. | Air-assist dosing system having priming detection |
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CN110295974A (en) * | 2018-03-21 | 2019-10-01 | 罗伯特·博世有限公司 | Vehicle SCR systems and its control unit and emptying control method |
US10570797B2 (en) | 2018-01-05 | 2020-02-25 | Cnh Industrial America Llc | Exhaust after-treatment system with improved DEF purge cycling in agricultural vehicles |
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FR2981689B1 (en) * | 2011-10-21 | 2014-12-26 | Peugeot Citroen Automobiles Sa | METHOD FOR PURGING A SYSTEM INJECTED BY A LIQUID AGENT INTO A SYSTEM AND INJECTION SYSTEM THAT CAN BE PURGED BY SUCH A METHOD |
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Also Published As
Publication number | Publication date |
---|---|
FR2958681B1 (en) | 2012-05-25 |
WO2011128542A1 (en) | 2011-10-20 |
FR2958681A1 (en) | 2011-10-14 |
EP2558693B1 (en) | 2016-12-28 |
EP2558693A1 (en) | 2013-02-20 |
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