WO2014124799A1 - Vorrichtung zur bereitstellung eines flüssigen additivs - Google Patents
Vorrichtung zur bereitstellung eines flüssigen additivs Download PDFInfo
- Publication number
- WO2014124799A1 WO2014124799A1 PCT/EP2014/051508 EP2014051508W WO2014124799A1 WO 2014124799 A1 WO2014124799 A1 WO 2014124799A1 EP 2014051508 W EP2014051508 W EP 2014051508W WO 2014124799 A1 WO2014124799 A1 WO 2014124799A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pump
- positive displacement
- displacement pump
- liquid additive
- seal
- Prior art date
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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
-
- 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]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/123—Machines, pumps, or pumping installations having flexible working members having peristaltic action using an excenter as the squeezing element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C5/00—Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
-
- 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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/10—Fluid working
- F04C2210/1083—Urea
-
- 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 invention relates to a method for operating a device for providing a liquid additive.
- a liquid additive fuel, water, ammonia, etc.
- an exhaust gas treatment device for the purification of exhaust gases from diesel internal combustion engines exhaust treatment devices are used, in which the reaction of nitrogen oxide compounds in the exhaust gas to harmless substances (nitrogen, carbon dioxide and water) takes place with the aid of a reducing agent - the method known in the art of selective catalytic reaction (SCR ).
- SCR selective catalytic reaction
- This reducing agent can be supplied, for example, as a liquid additive to the exhaust gas treatment device.
- urea-water solution is often used in this context.
- AdBlue® A 32.5 percent urea-water solution is available under the trade name AdBlue® as an additive for exhaust gas treatment.
- Devices for providing a liquid additive for motor vehicles should be constructed as inexpensively as possible and with as few as possible different components.
- the invention relates to a method for operating a device for providing a liquid additive, which has at least the following components: a suction point for the removal of liquid additive from a tank, a valve-free delivery line extending from the suction point to a delivery unit, and
- a valveless positive displacement pump wherein the positive displacement pump is adapted to move the liquid additive from the tank via the suction point along the To promote delivery line to the delivery unit, and wherein the positive displacement pump has at least one seal of the delivery line, which can be moved to promote the liquid additive along the delivery line.
- the method now comprises at least the following steps:
- a suction point in particular an opening is meant, at which a feed line for conveying the liquid additive opens into the tank. Liquid additive is drawn through the suction point from the tank into the delivery line when the pump of the device delivers liquid additive.
- the suction point is preferably arranged in a lower region of a tank (in particular on the tank bottom), so that the tank can be emptied as completely as possible via the suction point.
- a valve-free delivery line also means that the liquid additive does not pass any valves on its way from the intake point through the delivery line to a delivery unit.
- the pump which is arranged in the conveyor unit.
- a valve may be provided, and yet a valve-free delivery line is realized in the sense explained here.
- the delivery line is preferably formed by a hose and / or a channel, which is arranged for example in a block or a base plate of the conveyor unit. Such a channel in a block can be designed, for example, as bores.
- the delivery unit is preferably an injector, via which the liquid additive (in particular urea-water solution) can be supplied to an exhaust gas treatment device.
- the providing unit may comprise a nozzle which ensures the fine atomization of the liquid additive in the exhaust gas treatment device.
- the delivery unit may alternatively or additionally also have a dosing agent (in particular a dosing valve) with which a portioning or demand-based dosing of the liquid additive can take place.
- the metering with a metering valve takes place regularly over the opening time of the metering valve. The duration to which the metering valve is opened is typically proportional to the amount of metered liquid additive. This relationship allows accurate dosing.
- a positive displacement pump used here is a pump in which the liquid additive is conveyed by means of at least one self-contained volume. A backflow of the liquid additive is prevented by this self-contained volume.
- Positive displacement pumps are to be distinguished from flow pumps in which a fluid is conveyed, for example, by means of propellers and / or agitators. With positive displacement pumps, no backflow of the liquid additive is regularly possible in the shutdown case (when the pump is deactivated), while in the case of flow pumps, backflow is possible if the propeller or stirrer stops moving.
- the delivery rate is regularly dependent on the pressure difference generated by the pump, because a return flow, which depends on the pressure difference generated by the pump, results parallel to the delivery flow. This return flow and the flow are superimposed and give the flow rate.
- This relationship is typically not available with positive displacement pumps. At least in the range provided for pressure differences, the flow rate is not affected by the pressure difference generated. Particularly at low conveyor speeds, positive displacement pumps ensure a constant pressure hung possible, while in flow pumps, the possibility of increasing the pressure in each case greatly depends on the delivered amount of liquid.
- Valve-free positive displacement pumps are positive displacement pumps in which the liquid additive does not flow through (separate) valves when it flows in and out into the pump volumes.
- the positive displacement pump is preferably a positive displacement pump with a reversible delivery direction.
- the conveying direction of the positive displacement pump is reversible, it is particularly meant that the positive displacement pump can be operated with two different / opposite directions of flow.
- a drive is provided, the drive direction can be switched.
- the conveying direction of the positive displacement pump then also reverses.
- Liquid additive which is located in the delivery line is conveyed through the intake from the delivery line back into the tank.
- Such a positive displacement pump in a device for providing a liquid additive makes it possible to provide for emptying the delivery line without the need for many different additional components.
- the conveying direction of the positive displacement pump can be reversed in order to empty the positive displacement pump from the spreading unit to the tank.
- the operation stop of the device in step a) takes place, for example, together with the deactivation of a motor vehicle in which the described device is integrated. After an operation stop, the device would be disabled with and there is a risk that they will be exposed to low outside temperatures and the contained liquid additive freezes and causes damage. In order to avoid this, the subsequent steps in the context of the deactivation procedure are (still) carried out.
- a position of the seal within the positive displacement pump is detected.
- the at least one seal is preferably moved by the positive displacement pump during delivery with the positive displacement pump.
- the position of the seal during operation stop can be determined by calculation and / or with a sensor that detects the position of the seal.
- a sensor can also be arranged on a drive of the positive displacement pump and monitor the position of the drive.
- the drive of a positive displacement pump is preferably connected (rigidly) to the seal in such a way that the position of the drive permits a statement about the position of the seal.
- the envisaged parking position of the seal is a position within the displacement pump to which the at least one seal is to be arranged during a standstill phase of the device.
- a (single) parking position is defined for the displacement pump, so that the seal is transferred independently of the current position during operation stop in this parking position.
- the parking position is stored and retrievable in particular in a control unit. If the at least one seal is in this parking position, the risk of damage to the device by freezing liquid additive is particularly low or least.
- the method is advantageous if the positive displacement pump has a rotary drive and a movable pump element, wherein the movable pump element is moved for delivery in accordance with a rotational movement.
- the position of the drive being monitored may be, for example, a contiguous angle of the rotary drive.
- a rotary drive can be designed particularly cost-effective, for example, with an electric motor whose direction of rotation can be reversed by the electrical polarity.
- the movable pump element selectively executes a rotation or an eccentric rotational vibration in which it retains its basic orientation but is displaced in accordance with a rotational movement. This so-called eccentric rotational vibration of a movable pump element can be generated via a rotating eccentric driven by a rotary drive.
- a rotary drive and a correspondingly moving pump element enables a particularly energy-efficient drive mode of the positive displacement pump.
- the method is also advantageous if barbs are provided on the movable pump element which can become entangled when the movable pump element is moved in a direction of rotation counter to the conveying direction and the barbs are locked in the parking position after step c).
- This concept is also applicable to other pumps for the devices described.
- components may be provided on the movable pump element which lead to a particularly good sealing of at least one pump volume when the movable pump element is moved to a slight extent (for example by a few angular degrees) counter to the conveying direction.
- These components may be, for example, in the manner of ken and in particular be designed in the manner of harpoon-shaped barbs.
- the barbs are fluid-tightly sealed to a surface of the pump volumes by being pressed against a surface of the pump volumes when the movable pump element is moved slightly counter to the direction of conveyance.
- the barbs are preferably configured to disengage from the surface of the pumping volumes as the movable pumping element is further moved counter to the conveying direction.
- the barbs for example, flip them or fold. Then, a free movement of the movable pump element against the conveying direction is possible with which the pump can be emptied.
- the movable pump element should first be moved back in the conveying direction, so that the barbs get back into the starting position. Subsequently, the pump volumes can be closed again by a (slight) movement counter to the conveying direction.
- the described sealing by the barbs is preferably increased in relation to the normal sealing of the pump volumes such that the sealing by the barbs, even at pressures above the operating pressure, does not allow any liquid additive to pass through.
- this increased seal may also be sufficient to prevent ice pressure from components of the liquid additive delivery device that occurs when liquid additive in the device freezes.
- a hook structure may be provided, which favors the hooking of the barbs.
- the method is also advantageous when the positive displacement pump has at least one flexible sealing element for forming the at least one seal, wherein the flexible sealing element is suitable for enlarging at least one pump volume of the positive displacement pump, if within the at least one pump volume, a pressure above an operating pressure of the device occurs.
- the flexible sealing element can be for example a membrane, a hose, an impeller and / or a crimping disc.
- the flexible sealing member is deformed during operation of the positive displacement pump to displace the at least one seal.
- the flexible sealing element preferably also forms at least a portion of a wall of a pump volume.
- various types of positive displacement pumps are presented, which have a flexible sealing element for forming at least one seal.
- a flexible sealing member may have a very large surface oriented toward the at least one pump volume and, in particular, forms large parts of the wall of the pump volume (eg more than 50% or even more than 70%).
- the sealing element is flexible to provide a sliding seal. Therefore, a pump with a flexible sealing element in the case of freezing offers the possibility of providing a very large compensating volume for compensating for a volumetric expansion of the liquid additive during freezing.
- the method is advantageous if, in the intended parking position, an inlet s of the positive displacement pump is closed by the at least one seal.
- the positive displacement pump preferably has an inlet through which liquid additive is drawn into the positive displacement pump and an outlet at which the positive displacement pump discharges liquid additive.
- the positive displacement pump preferably forms a section of a delivery line through the device. The portion of the delivery line between the inlet and the outlet (or a portion thereof) forms the at least one pump volume of the displacement pump off. If an inlet of the positive displacement pump is closed, it is ensured that no liquid additive can flow into the at least one pump volume of the positive displacement pump from a section of the delivery line in the conveying direction upstream of the inlet. Preferably then no seal at the outlet is arranged (at the same time) so that the outlet of the positive displacement pump is free. Then, in the case of a volume expansion of the liquid additive in Einfrierfall a volume balance between the at least one pump volume of the positive displacement pump and a portion of the delivery line in the flow direction behind the outlet take place.
- the method is advantageous if in the intended parking position, an outlet of the positive displacement pump is closed by the at least one seal. If an outlet of the positive displacement pump is closed, it is ensured that no liquid additive can flow into the at least one pump volume of the positive displacement pump from a section of the delivery line in the conveying direction behind the outlet. Preferably then no seal is (at the same time) arranged at the inlet, so that the inlet of the positive displacement pump is free. Then, in the case of a volumetric expansion of the liquid additive in the case of freezing, a volume compensation can take place between the at least one pump volume of the positive displacement pump and a section of the delivery line upstream of the inlet.
- the method is advantageous if an inlet and an outlet of the positive displacement pump are open in the intended parking position.
- a volume compensation between the at least one pump volume of the positive displacement pump and a section of the delivery line in the flow direction is then possible. tion before the inlet and with a section of the delivery line in the flow direction behind the outlet possible.
- positive displacement pumps having a fixed total volume are pumps which have an outer rigid housing in which the at least one pump volume is located.
- This rigid housing usually contains no components that can be significantly compressed in freezing and thus release additional volume.
- Such a displacement pump with a rigid total pump volume could be destroyed if, in the case of freezing, larger displacements of liquid additive and / or frozen additive into the positive displacement pump would take place. For this reason, it is advantageous in such pumps, if both the inlet and the outlet are closed during operation stop of the device. In this case, the displacement pump is protected against shifts into the at least one pump volume during freezing.
- a positive displacement pump which is particularly advantageous for the described method has an internal stator and a movable pump element which is arranged externally around the stator.
- the movable pump element is surrounded by a non-movable housing.
- the movable pump element moves in the non-movable housing.
- the movable pump element is arranged around an inner stator.
- the movable pump element moves around the stator.
- Pump volumes, in which the liquid additive is conveyed by the positive displacement pump are arranged between the housing and the movable pump element in the first concept and between the movable pump element and the stator in the second concept.
- the flexible sealing element may then be formed by the outer stator or by the inner movable pump element.
- the positive displacement pump is a peristaltic pump.
- constrictions or closures in the conveying direction are moved along a delivery line through the peristaltic pump. If necessary, the constrictions or closures generate a plurality of closed pump volumes along the delivery line.
- the liquid additive in particular urea-water solution
- the restrictions or closures are formed at the upstream end of the delivery path in the peristaltic pump and moved continuously toward the downstream end of the delivery line in the peristaltic pump. At the downstream end, the constrictions or closures are then dissolved again.
- a peristaltic pump enables a particularly gentle and precise delivery of the liquid additive, through which particularly low tensions and friction occur in the liquid additive. As a result, crystallization of constituents of the liquid additive in the feed pump can be avoided. Furthermore, a device is considered advantageous if the positive displacement pump is a kind of peristaltic pump.
- a peristaltic pump In a peristaltic pump, a hose is compressed at various locations, so that constrictions or closures are formed in a conveying path formed by the hose through the positive displacement pump. The compressed portions of the tube are displaced so that the liquid additive is conveyed along the conveying path through the tube.
- Such a hose pump is a special ders simple and therefore particularly cost variant of a peristaltic pump, which is particularly advantageous for a device for providing liquid additive for this reason.
- the flexible sealing element is usually formed by the hose in a peristaltic pump.
- the device is advantageous if the positive displacement pump is an impeller pump.
- the movable pump element is an imple- ment that can rotate in a housing.
- the housing has an inlet and an outlet through which liquid additive can flow into the housing (inlet) and out of the housing (outlet).
- the impeller has Impellerärmchen, which abut sealingly on an outer side of the housing with a seal and thus form separated pump volumes in the housing.
- the pump volumes formed by the impeller sleeves are displaced, so that the liquid additive can flow from the inlet to the outlet.
- the impeller sleeves of the impeller are compressed or pressed by a recess of the housing.
- the pump volumes between the Impellerärmchen be greatly reduced. Therefore, a significantly smaller amount of liquid additive is delivered from the outlet to the inlet than from the inlet to the outlet.
- the impeller is designed so that a reversal of the direction of rotation of the impeller is possible. As a result, the conveying direction of the pump is reversed. The inlet then acts as an outlet and vice versa. In order to reverse the direction of rotation, a special design of the impeller sleeves of the impeller is necessary. The impeller sleeves must not tilt when reversing the direction of rotation in the housing and do not block the rotation.
- the impeller may also be designed such that the impeller sleeves of the impeller jam against the housing or at least partially clamp in the housing when the impeller is only partially (eg, around) a small amount. niger angular degree) is moved against the previously used conveying direction. In this way, a particularly good sealing of the pump volumes can take place, so that no return flow of liquid additive through the positive displacement pump is possible. Such a seal may be advantageous, for example, in order to seal the displacement pump so tightly when deactivating the device that occurring ice pressure does not open the positive displacement pump.
- An impeller pump is typically a pump with a fixed total pump volume.
- An impeller pump typically has a housing in which the impeller is disposed and which could be optionally destroyed by a volume expansion of liquid additive within the impeller pump. Therefore, it is particularly advantageous in an impeller pump when both the inlet and the outlet are closed with a seal in Abstellfall.
- the positive displacement pump can be arranged in a housing on the tank for the liquid additive, and the delivery line between the positive displacement pump and the supply unit can have a length of at least 1 meter.
- the positive displacement pump is arranged in a housing, which can be placed on an underside of a tank in the tank bottom.
- the tank bottom can have a chamber separated from the interior of the tank, in which the displacement pump is arranged.
- This chamber can also be designed as a housing, which can be inserted into an opening in the bottom of the tank.
- the housing is preferably free of liquid additive when the tank interior is filled with liquid additive.
- the suction point for removing the liquid additive from the tank is preferably arranged directly on an outer side of this housing and thus opens into the interior of the tank.
- the invention finds particular application in a motor vehicle having an internal combustion engine, an exhaust gas treatment device for cleaning the exhaust gases of the internal combustion engine and a device the exhaust gas treatment device, a liquid additive can be supplied and which can be operated with the described method.
- this is a delivery system for urea-water solution towards an SCR catalyst, as explained above.
- FIGS. show particularly preferred embodiments, to which the invention is not limited.
- the figures and in particular the magnitudes shown are only schematically. Show it:
- FIG. 6 shows a second embodiment of a pump for the described
- Fig. 8 a motor vehicle, comprising a device for the described
- Method 9 shows a fourth embodiment variant of a pump for the method described
- FIG. 10 shows a fifth embodiment variant of a pump for the described method.
- FIGS. 1 to 3 which represent different embodiment variants of a device 1, will be explained together, insofar as these representations have similarities.
- These devices 1 are suitable / adapted for carrying out the described method and allow the metered addition of liquid additive to an exhaust gas treatment device.
- the device 1 according to FIGS. 1 to 3 in each case has a delivery line 6 which extends from a suction point 17 in a tank 2 to a delivery unit 3.
- the liquid additive (especially urea-water solution) can be stored in the tank 2.
- the suction point 17 is located at an inner space 36 of the tank 2 and at the suction point 17, liquid additive can enter the delivery line 6 from the tank 2.
- a positive displacement pump 4 is provided, with which the liquid additive can be conveyed along the conveying line 6 with the conveying direction 5.
- the displacement pump 4 has a rotary drive 8, which can be controlled by a control unit 7.
- a pressure sensor 10 is arranged in the conveying direction 5 on the delivery line 6 behind the positive displacement pump 4, with which a pressure can be monitored, which was constructed by the positive displacement pump 4 in the delivery line 6.
- a level and quality sensor 16 is provided in each case, with which a level and optionally also the quality of the liquid additive in the tank 2 can be monitored.
- the level and quality sensor 16 is designed, for example, as an ultrasonic sensor that waves ultrasound radiates, which are reflected by a liquid level in the tank 2 and meet back to the level and quality sensor 16 so that the level of the level in the tank 2 can be determined by a transit time measurement.
- a transit time measurement of the ultrasonic waves to a reference surface (not shown here) in the liquid additive can also be used for a quality measurement.
- the supply unit 3 is designed with the aid of a passive valve 28 which automatically opens and provides liquid additive as soon as the pressure in the delivery line 6 in the conveying direction 5 behind the positive displacement pump 4 exceeds a certain limit.
- a delivery unit is particularly simple.
- the delivery unit 3 may additionally include a filter 27 which protects the passive valve from contamination.
- a more complexly constructed supply unit 3 is provided, which can be actively controlled by the control unit 7 as a function of the pressure measured by the pressure sensor 10.
- the delivery unit 3 has an actively actuatable injector valve 29. With such a supply unit 3, it is possible to actively set the pressure at which the dosage takes place. This makes it possible to change the pressure in order to set a spraying effect and / or a spray profile of the delivery unit 3.
- FIG. 3 shows a variant with a supply unit 3, which corresponds to FIG. 2.
- the device 1 is arranged in a housing 11, which is located at the bottom of the tank 2.
- the level and quality sensor 16 is also provided in the housing 11, and the suction point 17 is also located on the housing 11.
- the conveying line 6 preferably a line length 30 which is greater than 1 m and preferably less than 5 m.
- Fig. 4 shows schematically the structure of a peristaltic pump, which is a typical positive displacement pump 4 for the described method.
- the conveying direction 5 which extends along the conveying line 6.
- the delivery line 6 is divided by seals 19 into different pump volumes 18.
- the seals 19 move along the conveying direction 5 through the conveying line 6. As a result, the liquid additive is pressed along the conveying direction 5.
- the seals 19 are formed by constrictions and / or closures of the delivery line 6 (itself), which form along the conveying direction 5 at an upstream end 37 of the delivery line 6 in the positive displacement pump 4 and at a downstream end 38 of the delivery line 6 in the positive displacement pump 4th dissolve again.
- FIG. 5 shows a variant embodiment of a displacement pump 4, in which a movable pump element 9 designed as an eccentric 21 is movable in accordance with a rotational movement.
- This movable pump element 9 has elevations 31.
- the delivery line 6 is formed within the positive displacement pump 4 with a hose 20.
- the tube 20 is deformed during a rotation of the movable pump element 9, so that form seals 19 and in the delivery line 6 separate pump volumes 18 arise.
- the seals 19 and the pump volumes 18 shift, so that the liquid additive is moved through the conveying line 6 along the conveying direction 5.
- the flexible sealing element 46 for forming the seals 19 is formed in the positive displacement pump 4 according to FIG. 5 of the hose 20.
- FIG. 6 shows a variant embodiment of a displacement pump 4, which has a movable pump element 9 embodied as an imple ment 22. This impeller 22 is movable in an impeller chamber 23 in accordance with a rotational movement 32.
- the impeller 22 has impeller sleeves 39 which abut against a wall of the impeller chamber 23 and form seals 19 with the wall of the impeller chamber 23. Thus 39 separate pump volumes 18 are formed between the Impellerärmchen. Liquid additive may flow through an inlet 25 into the impeller chamber 23 and out through an outlet 26 from the impeller chamber 23.
- the impeller chamber 23 is designed largely cylindrical, wherein the impeller 22 is arranged axially symmetrically in the impeller chamber 23.
- the impeller chamber 23 has an indentation 24, by which the pump volumes 18 are compressed between the impeller sleeves 39 of the impeller 22, so that given a given rotational movement 32 of the impeller, only a flow of the liquid additive from the inlet 25 to the outlet 26 and can not be made from the outlet 26 to the inlet 25.
- Such a pump has a rigid total pumping volume 47, which does not allow a change in volume in the case of freezing. Therefore, the parking positions 44 for the seals 19 are arranged here on the inlet 25 and the outlet 26 to close the inlet 25 and the outlet 26 during operation stop. For this purpose, the position 45 of the seals 19 is adapted to the parking position 44.
- Fig. 7 shows a further embodiment of a positive displacement pump 4 for the device described.
- the displacement pump 4 has a movable pump element 9, which is moved by an eccentric 21 in a movement region 33 in accordance with a rotational movement 32.
- the rotational movement 32 is shown in FIG. 7 lower left with a coordinate system.
- the movable pump element 9 performs an eccentric pendulum motion.
- the movable pump element 9 does not rotate itself.
- Each section 34 of the movable pump element 9 is, however, according to the Rota tion movement 32 moves.
- the movable pump element 9 forms in the housing 11 at least one seal 19, by which at least one pump volume 18 is limited.
- the seal 19 moves through the rotational movement 32 in the housing 11. By this movement takes place a promotion of liquid additive.
- the liquid additive is conveyed by the displacement pump 4 along the conveying direction 5 from an inlet 25 of the positive displacement pump 4 to an outlet 26 of the positive displacement pump 4.
- the above explanations on the position of the seals and the desired parking position are applicable accordingly, in each case depending on where in the Abstellfall a volume compensation should be possible, the seals 19 can be placed in the appropriate (predetermined) parking positions.
- FIG. 8 shows a motor vehicle 12 comprising an internal combustion engine 13 and an exhaust gas treatment device 14 for cleaning the exhaust gases of the combustion engine 13.
- an SCR catalytic converter 15 is arranged, with which a selective catalytic reduction for the purification of the exhaust gases of Internal combustion engine 13 can be performed.
- the exhaust gas treatment device 14 can be supplied with the aid of a supply unit 3, a liquid additive for the method of selective catalytic reduction.
- the supply unit 3 is supplied by a device 1 with liquid additive from the tank 2.
- the supply device 3 is connected to a conveyor line 6 to the device 1 and the tank 2.
- FIG. 9 shows a variant embodiment of a positive-displacement pump 4, in which the movable pump element 9 is arranged on the outside about a stationary stator 41.
- the pump volumes 18 with which the liquid additive with the conveying 5 is conveyed by the positive displacement pump 4 are arranged between the movable pump element 9 and the stationary stator 41.
- the movable pump element 9 forms a flexible sealing element 46.
- In the stator 41 there are an inlet 25 and an outlet 26, via which the liquid additive can flow or flow out into the pump volumes 18.
- the movable pump element 18 are sealed by seals 19 against each other.
- the movable pump element 18 is elliptical in shape and the stator 41 is round.
- the shorter axis of the elliptical shape of the movable pump element 18 corresponds to the diameter of the movable pump element 18.
- the stator 41 and the movable pump element 9 are in contact.
- the movable pump element 9 can be moved in accordance with a rotational movement 32.
- the rotational movement 32 is basically possible in two directions. One direction of the rotational movement 32 corresponds to a conveying direction 5 of the liquid additive by the displacement pump 4.
- the rotational movement 32 causes the seals 19 to move and the pump volumes 18 are displaced from the inlet 25 to the outlet 26.
- the stator has a lug 42 between the outlet 26 and the inlet 25. The function of this lug 42 corresponds to the function of the indentation 24 in the embodiment variant of a displacement pump shown in FIG. Through the nose 42, the outlet 26 is sealed fluid-tight with respect to the inlet 25.
- the movable pump element 9 is elastic for this purpose.
- the movable pump element 9 therefore deforms on the nose 42 so that it can rotate completely in spite of the nose 42 around the stator 41 in accordance with the rotational movement 32.
- shown here is a position 45 of the seal 19 in a parking position 44, which allows a volume balance with the pump volumes 18 through both the inlet 25 and the outlet 26.
- a movable pump element 9 can be moved in accordance with a rotational movement 32.
- the rotational movement 32 is in two possible.
- One direction of the rotational movement 32 corresponds to a conveying direction 5 of the liquid additive by the positive displacement pump 4.
- the movable pump element 9 is arranged in a housing 11 and forms a flexible sealing element 46.
- the housing 11 has an inlet 25 and an outlet 26.
- the movable pump element 9 has a plurality of elevations 31, which rest against the housing 11 and so form seals 19. Between the seals 19, the housing 11 and the movable pump element 9 are closed pump volumes 18, with which the liquid additive is conveyed in a rotational movement 32 of the movable pump element 9.
- the housing has an indentation 24, which prevents liquid additive from flowing from the outlet 26 back to the inlet 25 counter to the conveying direction 5. If a survey 31 of the movable pump element 9 during the rotational movement 32 passes the indentation 24, this elevation 31 is compressed. At the elevations 31 barbs 40 are provided which can hook on the housing 11 when the movable pump element 9 is moved counter to the conveying direction 5. By hooking these barbs 40, the tightness of the seals 19 can be increased. On the housing 11, a hook structure 43 may be provided, which favors the hooking of the barbs 40 at the elevations 31.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Exhaust Gas After Treatment (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14701535.8A EP2956640A1 (de) | 2013-02-13 | 2014-01-27 | Vorrichtung zur bereitstellung eines flüssigen additivs |
US14/767,513 US9909477B2 (en) | 2013-02-13 | 2014-01-27 | Method for providing a liquid additive |
KR1020157025096A KR20150119267A (ko) | 2013-02-13 | 2014-01-27 | 액체 첨가제를 제공하는 방법 |
JP2015557362A JP2016513207A (ja) | 2013-02-13 | 2014-01-27 | 液状添加剤の供給装置 |
RU2015138935A RU2608660C1 (ru) | 2013-02-13 | 2014-01-27 | Устройство для предоставления жидкой присадки |
CN201480008483.8A CN105121800A (zh) | 2013-02-13 | 2014-01-27 | 用于提供液态添加剂的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013101412.7 | 2013-02-13 | ||
DE102013101412.7A DE102013101412A1 (de) | 2013-02-13 | 2013-02-13 | Vorrichtung zur Bereitstellung eines flüssigen Additivs |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014124799A1 true WO2014124799A1 (de) | 2014-08-21 |
Family
ID=50023564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2014/051508 WO2014124799A1 (de) | 2013-02-13 | 2014-01-27 | Vorrichtung zur bereitstellung eines flüssigen additivs |
Country Status (8)
Country | Link |
---|---|
US (1) | US9909477B2 (de) |
EP (1) | EP2956640A1 (de) |
JP (1) | JP2016513207A (de) |
KR (1) | KR20150119267A (de) |
CN (1) | CN105121800A (de) |
DE (1) | DE102013101412A1 (de) |
RU (1) | RU2608660C1 (de) |
WO (1) | WO2014124799A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20170036083A (ko) * | 2014-08-28 | 2017-03-31 | 콘티넨탈 오토모티브 게엠베하 | 강화 링을 구비하는 궤도 펌프 |
Families Citing this family (11)
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DE102015203437B3 (de) * | 2015-02-26 | 2016-06-09 | Continental Automotive Gmbh | Verfahren zum Betrieb einer Vorrichtung zur dosierten Bereitstellung einer Flüssigkeit |
IT201700031729A1 (it) * | 2017-03-22 | 2018-09-22 | Ali Group Srl Carpigiani | Pompa per l'erogazione di prodotti alimentari liquidi o semiliquidi o semisolidi e macchina comprendente detta pompa. |
CN109386352B (zh) * | 2017-08-09 | 2024-05-03 | 博世动力总成有限公司 | 用于尾气后处理的供给模块和尾气后处理装置 |
DE102018118100A1 (de) * | 2018-07-26 | 2020-01-30 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Pumpe mit absoluter Drehwinkel-Erfassung |
DE102018212831A1 (de) | 2018-08-01 | 2020-02-06 | Bayerische Motoren Werke Aktiengesellschaft | Einlassstruktur eines Speichertopfes |
DE102018007094A1 (de) | 2018-09-07 | 2019-04-25 | Daimler Ag | Vorrichtung und Verfahren zum Auftauen eines Reduktionsmittels |
CN109210021B (zh) * | 2018-10-11 | 2024-04-02 | 中国水利水电科学研究院 | 一种无叶片式水底或其他液体中物料提取装置及使用方法 |
AT522644A1 (de) * | 2019-06-06 | 2020-12-15 | Rosenbauer Int Ag | Verfahren sowie Flüssigkeits-Mischsystem zum Bereitstellen eines Flüssigkeitsgemisches |
DE102021106585A1 (de) | 2021-03-18 | 2022-10-20 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zum Betreiben einer Peristaltikpumpe, Peristaltikpumpe, Kraftfahrzeug sowie Verwendung einer solchen Peristaltikpumpe |
CN113483844B (zh) * | 2021-06-16 | 2023-02-24 | 东风柳州汽车有限公司 | 一种尿素传感器容积测试装置及测试方法 |
CN113617404A (zh) * | 2021-10-09 | 2021-11-09 | 上海荧辉医疗器械有限公司 | 微流控芯片结构及蠕动泵装置 |
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EP1241355A2 (de) * | 2001-03-13 | 2002-09-18 | Japan Servo Co. Ltd. | Rollenpumpe |
US20090301064A1 (en) * | 2008-06-05 | 2009-12-10 | Eugen Maier | Urea pump assembly for an exhaust gas treatment system |
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MX9203047A (es) * | 1991-06-21 | 1993-08-01 | Orbital Eng Pty | Metodo para el control de suministro de aceite lubricante para un motor de combustion interna de dos tiempos |
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JP4677892B2 (ja) * | 2005-12-07 | 2011-04-27 | トヨタ自動車株式会社 | ルーツ型ポンプおよび燃料電池システム |
JP2007154831A (ja) * | 2005-12-07 | 2007-06-21 | Koito Ind Ltd | 間欠制御式チューブポンプ |
JP2008095573A (ja) | 2006-10-10 | 2008-04-24 | Toyota Motor Corp | 高圧ポンプ |
DE102006061731A1 (de) * | 2006-12-28 | 2008-07-03 | Robert Bosch Gmbh | Dosiervorrichtung für Flüssig-Reduktionsmittel |
CN201284738Y (zh) * | 2008-10-16 | 2009-08-05 | 苏州百胜动力机器有限公司 | 柔性叶轮叶片泵 |
RU90488U1 (ru) * | 2009-08-27 | 2010-01-10 | Общество с ограниченной ответственностью "СИНЕРГИЯ-ЛИДЕР" | Дозирующий блок |
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-
2013
- 2013-02-13 DE DE102013101412.7A patent/DE102013101412A1/de active Pending
-
2014
- 2014-01-27 KR KR1020157025096A patent/KR20150119267A/ko not_active Application Discontinuation
- 2014-01-27 CN CN201480008483.8A patent/CN105121800A/zh active Pending
- 2014-01-27 EP EP14701535.8A patent/EP2956640A1/de not_active Withdrawn
- 2014-01-27 US US14/767,513 patent/US9909477B2/en active Active
- 2014-01-27 RU RU2015138935A patent/RU2608660C1/ru active
- 2014-01-27 JP JP2015557362A patent/JP2016513207A/ja not_active Ceased
- 2014-01-27 WO PCT/EP2014/051508 patent/WO2014124799A1/de active Application Filing
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EP1241355A2 (de) * | 2001-03-13 | 2002-09-18 | Japan Servo Co. Ltd. | Rollenpumpe |
US20090301064A1 (en) * | 2008-06-05 | 2009-12-10 | Eugen Maier | Urea pump assembly for an exhaust gas treatment system |
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KR20170036083A (ko) * | 2014-08-28 | 2017-03-31 | 콘티넨탈 오토모티브 게엠베하 | 강화 링을 구비하는 궤도 펌프 |
Also Published As
Publication number | Publication date |
---|---|
RU2608660C1 (ru) | 2017-01-23 |
US9909477B2 (en) | 2018-03-06 |
EP2956640A1 (de) | 2015-12-23 |
CN105121800A (zh) | 2015-12-02 |
US20150377106A1 (en) | 2015-12-31 |
DE102013101412A1 (de) | 2014-08-14 |
KR20150119267A (ko) | 2015-10-23 |
JP2016513207A (ja) | 2016-05-12 |
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