WO2018147778A1 - Liquid filter device, reducing agent dosing unit, reducing agent dosing system and a vehicle comprising the liquid filter device - Google Patents

Liquid filter device, reducing agent dosing unit, reducing agent dosing system and a vehicle comprising the liquid filter device Download PDF

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Publication number
WO2018147778A1
WO2018147778A1 PCT/SE2018/050050 SE2018050050W WO2018147778A1 WO 2018147778 A1 WO2018147778 A1 WO 2018147778A1 SE 2018050050 W SE2018050050 W SE 2018050050W WO 2018147778 A1 WO2018147778 A1 WO 2018147778A1
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WO
WIPO (PCT)
Prior art keywords
reducing agent
filter
filter device
liquid
filter element
Prior art date
Application number
PCT/SE2018/050050
Other languages
French (fr)
Inventor
Peter Engelke
Per Bremberg
Max Lindfors
Original Assignee
Scania Cv Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scania Cv Ab filed Critical Scania Cv Ab
Publication of WO2018147778A1 publication Critical patent/WO2018147778A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
    • 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]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D27/00—Cartridge filters of the throw-away type
    • B01D27/14—Cartridge filters of the throw-away type having more than one filtering element
    • B01D27/146—Cartridge filters of the throw-away type having more than one filtering element connected in series
    • B01D27/148—Cartridge filters of the throw-away type having more than one filtering element connected in series arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1426—Filtration means
    • 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

  • Liquid filter device Liquid filter device, reducing agent dosing unit, reducing agent dosing system and a vehicle comprising the liquid filter device
  • the present invention relates to a liquid filter device, reducing agent dosing unit, reducing agent dosing system and a vehicle comprising the liquid filter device.
  • Vehicles comprising an internal combustion engine and especially a diesel engine comprise several liquid feeding systems.
  • urea-containing solutions such as commercially available Adblue ®
  • Adblue ® needs to be transported from a urea solution tank to the selective catalytic reduction (SCR)-system in the exhaust gas system of the vehicle.
  • the liquid systems usually comprise at least one filter device for filtration of the liquid before it reaches the component where the liquid is used, e.g. the injection system for a reducing agent, such as urea solution, in the SCR system of the vehicle.
  • the injection systems and other components, such as pumps in the liquid system are sensitive to impurities. Even though filter devices are often effective, there may be a small amount, e.g.
  • a compact fine mesh filter device is often provided in connection with a component to which the liquid is fed.
  • these filter devices are small and the size of them is limited by the size of the component and therefore have a limited surface area. Further, they are often complicated to change and clean while they are essential to increase the lifetime of the component, such as an injection device. Therefore, there is a need to improve the filtering efficiency of the filtering device and facilitate the service of the filtering devices in the liquid systems of a vehicle.
  • the objective of the present invention is to provide a liquid filter device, which has an improved filtering capacity. It is also an objective to provide a liquid filter device which is compact and space saving and has a simple and light construction. Further, it is an objective of the present invention to minimize the problems with operational disturbances in liquid systems of a vehicle.
  • urea dosing unit which is space-saving and which comprises a filter device which can be easily changed and serviced.
  • the present invention thus relates to a liquid filter device comprising a support body carrying a first filter element comprising a first filter material, which first filter element radially surrounds a hollow central tube of the support body.
  • the hollow central tube extends between a first end portion and a second end portion of the support body.
  • the filter device further comprises a second filter element comprising a second filter material.
  • a simplified service of the filter device can be obtained since both the first and the second filter elements can be changed during one service occasion.
  • the filter device of the present disclosure maximizes the filtering efficiency, since the second filter element can capture particulate material that passes the first filter element. Further, in this way particulate material that passes the first filter element will be captured already in the filter device, and the amount of particulate material entering additional components downstream of the filter device in a liquid feeding system is minimized.
  • the first filter material may have a mesh size of less than or equal to 25 ⁇ and/or the second filter material may have a mesh size of less than or equal to 30 ⁇ . In this way the filtering efficiency may be further improved.
  • the second filter element is arranged such that the first filter element surrounds the second filter element.
  • the liquid to be filtered can be fed to the second filter element via the first filter element whereby efficient filtering can be obtained.
  • the second filter element is preferably arranged coaxially with the first filter element. By coaxial structure, the filter device will be compact and light-weight.
  • the filter device may have a substantially circular cylindrical shape.
  • the first filter element therefore radially surrounds the second filter element.
  • a symmetrical shape for the filter device is obtained, whereby the filter materials in both the first and second filter elements can be equally loaded over the surface of the filter elements.
  • the operational lifetime of the filter elements can be prolonged.
  • the second filter element may constitute the hollow central tube.
  • the first filter material suitably comprises or consists of nylon fibres, or comprises or consists or cellulosic fibres and is thus paper-based. These materials are commonly used in filtering devices and it is possible to obtain high filtering efficiency.
  • the second filter material may be of the same type as the first filter material. However, it may also be of another type than the first filter material.
  • the second comprises a plastic net or metallic net. These materials have a high stability and they do not loose stiffness in liquid feeding systems, which is especially advantageous if the second filter element constitutes the hollow central tube.
  • the filter device may further comprise a housing, which surrounds the support body carrying the first filter element and the second filter element.
  • the housing protects the filter device and enables easy mounting of the filter device to a liquid feeding system.
  • the first and second end portions of the support body are suitably arranged in liquid tight contact with the first filter element so that the liquid to be filtered is forced to pass through the first filter element. In this way, there are no gaps in the filter device through which the liquid could pass without filtering and thus, the filtering efficiency is further improved.
  • the liquid filter device is arranged to filter a reducing agent. Reducing agent is used in the selective catalytic reduction (SCR) system of the exhaust gas system and is usually an aqueous solution containing urea.
  • the present filter device is especially adapted for the filtration of reducing agent.
  • the present invention further relates to a reducing agent dosing unit comprising a pump device and the liquid filter device according to the present invention and as described above.
  • the reducing agent dosing unit may be an independently attachable or detachable unit. This means that the unit is arranged as a module in a reducing agent dosing system and can be provided as a separate component. This is a huge advantage enabling an easy maintenance and service of the pump and/or the filter device.
  • the present invention also relates to a reducing agent dosing system for an exhaust gas system of an internal combustion engine.
  • the reducing agent dosing system comprises a tank for the reducing agent, the reducing agent dosing unit as described above and at least one component downstream of the reducing agent dosing unit comprising an injection device arranged to inject the reducing agent into the exhaust gas system.
  • the system is modular and each of the components can be independently attached to or detached from the system.
  • the at least one component downstream of the reducing agent dosing unit preferably comprises an additional filter device comprising a screen.
  • the mesh size of the second filter material is preferably smaller than the mesh size of the screen. In this way, the amount of particulate material captured by the screen can be minimized.
  • the present invention also relates to a vehicle comprising the liquid filter device, reducing agent dosing unit and/or reducing agent dosing system as described above.
  • Fig. 1 shows a schematic side view of a vehicle, which comprises a liquid filter device, reducing agent dosing unit and reducing agent dosing system for an internal combustion engine according to the present invention
  • Fig. 2 shows schematically a filter device according to one aspect of the invention an a perspective view
  • Fig. 3 shows the filter device of Fig. 2 from above with arrows showing schematically the flow of fluid from the surroundings towards the filter element
  • Fig. 4 shows a schematic and longitudinal cut view of a filter device according to the present invention, wherein arrows showing schematically the flow of fluid inside the filter device are provided,
  • Fig. 5 shows in a coupling scheme for a urea dosing system comprising a urea dosing unit according to one aspect of the invention.
  • Internal combustion engines are used in various types of applications and vehicles today, e.g. in heavy vehicles such as trucks or buses, in cars, motorboats, steamers, ferries or ships. They may also be used in industrial engines and/or engine-powered industrial robots, power plants, e.g. electric power plants provided with a diesel generator, and in locomotives. Due to stricter regulations in respect of emissions, exhaust gases from the internal combustion engines need to be purified. Therefore, vehicles are provided with an exhaust gas purification system, which may comprise several components. For example, an exhaust system may be partly or completely comprised in a silencer, which is intended for an internal combustion engine and may be employed preferably in a vehicle, e.g. in a truck or bus.
  • a silencer which is intended for an internal combustion engine and may be employed preferably in a vehicle, e.g. in a truck or bus.
  • a vehicle is provided with an internal combustion engine and Fig. 1 depicts a vehicle 1 in a schematic side view, which is provided with an internal combustion engine 2, which powers the vehicle's tractive wheels 4 via a gearbox 6 and a propeller shaft 8.
  • the engine 2 is provided with an exhaust gas system 10 in which a silencer 12 is fitted.
  • the exhaust gas system 10 includes a SCR purification system (not shown) and is fluidly connected to a liquid tank 20 for a reducing agent, from which the reducing agent is supplied to the SCR purification system via a dosing system 24 comprising a dosing unit 22, which comprises a liquid filter device 23 (see Fig. 5) of the present invention and a pump 21 (see Fig.
  • the liquid filter device 23 of the present invention is suitably arranged to filter the reducing agent.
  • the engine 2 is powered by fuel 14 supplied to it via a fuel system 16 which comprises a fuel tank 18.
  • the exhaust gas system may comprise one or more of the following components, which are suitably placed in the silencer of a vehicle.
  • the silencer comprises an inlet for leading an exhaust gas flow into the silencer.
  • the silencer may comprise a diesel oxidation catalyst (DOC) which may be arranged downstream of the inlet.
  • a DOC is a unit designed to oxidize carbon monoxide, gas phase hydrocarbons and soluble organic fraction (SOF) of diesel particulate matter to C0 2 and H 2 0.
  • a diesel particulate filter may be arranged downstream of the DOC.
  • a DPF is a unit designed to remove diesel particulate matter or soot from the exhaust gas flow.
  • the DPF can for example be a catalysed soot filter (CSF).
  • CSF catalysed soot filter
  • SCR selective catalytic reduction
  • the reducing agent may be for example a urea-containing solution, such as a mixture containing water and urea, e.g. a product with the trade name AdBlue ® .
  • a mixing and vaporisation arrangement which comprises a vaporisation chamber for mixing of the exhaust gas flow and reducing agent and for vaporization of the reducing agent is arranged downstream of the dosing system for the reducing agent.
  • the SCR purification system comprises a SCR-substrate, which may comprise vanadium, iron, or copper catalyst, which breaks NO x down to water vapour and nitrogen.
  • An ammonia slip catalyst (ASC) which is designed to convert the NH 3 slip to N 2 and H 2 0, may be arranged downstream of the SCR purification system.
  • An outlet for leading the exhaust gas flow out from the silencer is arranged downstream of the ASC.
  • the silencer may comprise several outlets.
  • reducing agent dosing systems include at least one filter and pump to supply reducing agent to the vaporization chamber in the exhaust gas system of a vehicle.
  • the reducing agent may be for example injected to the vaporization chamber by means of a spraying device.
  • the components downstream of the filter device are usually sensitive for impurities and therefore, a fine mesh filter can be provided in connection with the component, e.g. a pump or a spraying device. Due to the required compact construction of the exhaust gas system in the vehicle, the fine mesh filters are often difficult to reach and therefore serve. Therefore, there is a risk for clogging of the fine mesh filter, which leads to operational disturbances. Thus, there is a need for a reliable, easy to maintain and perform service filter device.
  • the present filter device solves these problems.
  • the liquid filter device of the present invention is especially adapted for filtering a reducing agent, such as a urea-containing agent, in an exhaust gas system of a vehicle.
  • Fig. 2 shows in a perspective view an example of a liquid filter device 23 according to the present invention.
  • Fig. 3 shows a filter device of the present invention from above, and reference herein below is made equally to Fig. 2 and 3.
  • the filter device 23 is arranged in fluid connection with a tank 20 comprising the reducing agent, e.g. AdBlue ® , by means of a supply pump 21 (as shown in Fig. 1 and 5).
  • the liquid filter device 23 comprises a support body 25 carrying a first filter element 26 comprising a first filter material.
  • the support body 25 comprises a hollow central tube, which is shown in Fig. 3 from above.
  • the first filter element 26 radially surrounds the hollow central tube 27 of the support body 25.
  • the filter device may have a substantially circular cylindrical shape, i.e. the cross section of the filter device is circular.
  • shape of the first filter element and the second filter element adapt to the shape of the filter device.
  • the cross section of the respective first and second filter device is spherical.
  • the cross-section of the filter device may have another shape such as oval or rectangular.
  • the hollow central tube 27 is arranged to extend between a first end portion 31 and a second end portion 32 of the support body 26.
  • the first end portion 31 may be provided with a collar portion 42 to enable easy mounting of the filter device for example in a filter housing 40 (shown in Fig. 4).
  • the end portions have a shape in a plane, which is perpendicular to a plane extending in a longitudinal extension L (see Fig. 4) of the filter device, corresponding to the outer periphery of the first filter element.
  • the filter device 23 further comprises a second filter element 28 comprising a second filter material. In this way, further filtration of the reducing agent can be provided in a compact manner.
  • the second filter element 28 is arranged such that the first filter element 26 surrounds the second filter element 28.
  • the second filter element 28 is arranged coaxially with the first filter element 26, and this can be seen best in Fig. 4 in which a longitudinal axis L, which corresponds to a common central axis for the first and second filter elements 26, 28, is shown.
  • the second filter element 28 constitutes the hollow central tube 27.
  • the first filter material may have a finer mesh size than the second filter material and can be for example a mesh size of less than or equal to 25 ⁇ . In this way, most of the impurities in form of particles can be captured by the first filter element.
  • a second filter element is suitably arranged downstream of the first filter element in the filter device of the present invention.
  • the second filter material may have a mesh size which is slightly coarser than the mesh size of the first filter element and ca be for example a mesh size of less than or equal to 30 ⁇ . In this way, the risk for particulate impurities clogging small filter devices in connection with components downstream of the filter device is minimized.
  • the mesh size of the filter elements could be the same or the mesh size of the first filter element could be coarser than the mesh size of the second filter element.
  • the first filter material may be of any suitable kind and may for example comprise nylon fibres and/or it may be paper-based or comprise cellulosic fibres.
  • the second filter material may be of the same kind as the first filter material or it may be different and may comprise for example plastic and/or metallic net.
  • the liquid to be filtered is arranged to enter the first filter element through the peripheral surface of the first filter element 26.
  • the entrance of the liquid to the filter device 23 is illustrated in Fig. 3 from above by means of arrows.
  • the liquid is arranged to enter the filter device 23 substantially symmetrically along the periphery of the first filter element 26 so that the filter element 26 is loaded evenly.
  • Fig. 4 illustrates how the liquid travels inside the filter device.
  • the filter device 23 further comprises a housing 40, which surrounds the support body 25 carrying the first filter element 26 and the second filter element 28.
  • the filter device is arranged in fluid connection with the liquid tank 20 and the housing 40 comprises an opening 43 through which the liquid is supplied to the first and second filter elements 26, 28.
  • the liquid passes the first filter element 26 and subsequently the second filter element 28 and the purified liquid is supplied through an outlet 41 in the collar portion 42 further to at least one additional component, such as an injection device, arranged to inject the reducing agent into the exhaust gas system.
  • the liquid may be fed in a direction perpendicular to the longitudinal axis L of the filter device, or it can be fed tangentially at an angle in respect of the longitudinal axis L of the filter device such that the liquid flow is directed towards the outlet 41 of the filter device 23.
  • the first and second end portions 31, 32 of the support body 25 are preferably arranged in liquid tight contact with the first filter element 26 so that the liquid to be filtered is forced to pass through the first filter element 26. This means that there is no gap between the respective end portion 31 and/or 32 and the first filter element 26 and the liquid must pass through the first filter element. In this way all liquid is filtered at least by the first filter element.
  • the second filter element 28 can be arranged in liquid tight contact with the respective first and/or second end portion 31, 32 of the support body 25.
  • the present invention further relates to a reducing agent dosing unit shown schematically in Fig. 5.
  • the reducing agent dosing unit 22 comprises a pump device 21 arranged to pump the reducing agent from the tank 20 for the reducing agent and the liquid filter device 23 as described above.
  • the dosing unit 22 is preferably contained in a unit housing 51, which surrounds the pump and the filter device 23.
  • the first filter element 26 and the second filter element 28 of the filter device 23 are arranged in the housing 40.
  • the reducing agent dosing unit is an independently attachable or detachable unit.
  • the dosing unit 22 may comprise detachable attachment means (not shown) that enable attachment and detachment of the unit to pipelines in the exhaust system in an easy way.
  • the filter device 23 and the pump device 21 may be detachably arranged in the dosing unit 22, whereby easy maintenance and service can be performed.
  • a modular dosing unit with exchangeable filter device and pump device is provided.
  • the housing 40 and the unit housing 51 are manufactured of any suitable material that tolerates the environment in an exhaust gas system of a vehicle and may comprise plastic material and/or metal.
  • the present invention further relates to a reducing agent dosing system 24 for an exhaust gas system of an internal combustion engine, which comprises a tank 20 for the reducing agent, the reducing agent dosing unit 22 and at least one additional component downstream of the reducing agent dosing unit 22. It the additional components an injection device 60 arranged to inject the reducing agent into the exhaust gas system is included.
  • the injection device provides the reducing agent into the exhaust gas flow in a vaporization chamber of a SCR system, whereby the NOx-content of the exhaust gas flow can be reduced.
  • the at least one component downstream of the reducing agent dosing unit 22 comprises a filter device 62 comprising a screen.
  • the component can be further protected from particulate impurities.
  • the mesh size of the second filter material in the second filter element 28 is smaller than the mesh size of the screen. In this way, most of the particulate material can be captured by the filter device 23, but the particulate matter present in the system 24 will be captured by the filter device 62, and thus the additional component 60 will be protected.

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

Abstract

The present invention relates to a liquid filter device (23) comprising a support body (25) carrying a first filter element (26) comprising a first filter material. The first filter element radially surrounds a hollow central tube (27) of the support body (25) and the hollow central tube (27) extends between a first end portion (31) and a second end portion (32) of the support body (25). The filter device (23) comprises a second filter element (28) comprising a second filter material. The present invention also relates to a reducing agent dosing unit comprising a pump device and the liquid filter device, to a reducing agent dosing system comprising a tank for the reducing agent (20), the reducing agent dosing unit and an injection device (60) arranged to inject the reducing agent into the exhaust gas system, and to a vehicle (1) comprising the liquid filter device and/or the reducing agent dosing system.

Description

Liquid filter device, reducing agent dosing unit, reducing agent dosing system and a vehicle comprising the liquid filter device
TECHNICAL FIELD
The present invention relates to a liquid filter device, reducing agent dosing unit, reducing agent dosing system and a vehicle comprising the liquid filter device.
BACKGROUND ART
Vehicles comprising an internal combustion engine and especially a diesel engine comprise several liquid feeding systems. For example, urea-containing solutions, such as commercially available Adblue®, needs to be transported from a urea solution tank to the selective catalytic reduction (SCR)-system in the exhaust gas system of the vehicle. The liquid systems usually comprise at least one filter device for filtration of the liquid before it reaches the component where the liquid is used, e.g. the injection system for a reducing agent, such as urea solution, in the SCR system of the vehicle. The injection systems and other components, such as pumps in the liquid system are sensitive to impurities. Even though filter devices are often effective, there may be a small amount, e.g. less than 1% of the total amount of particles in the liquid to be filtered, passing through the filter device thereby causing disturbances in the liquid systems downstream of the filter device. Therefore, a compact fine mesh filter device is often provided in connection with a component to which the liquid is fed. However, these filter devices are small and the size of them is limited by the size of the component and therefore have a limited surface area. Further, they are often complicated to change and clean while they are essential to increase the lifetime of the component, such as an injection device. Therefore, there is a need to improve the filtering efficiency of the filtering device and facilitate the service of the filtering devices in the liquid systems of a vehicle.
There have been attempts in the prior art to improve liquid receptacles in liquid systems of a vehicle. For example, US20090127265 Al discloses a liquid receptacle for urea solution, which is connected to a filter device. The document deals with problems relating to freezing and packaging the equipment to reduce the required space but is silent about how to improve filtration grade and how to design such filter device. Therefore, there is still a need to improve the liquid filtering devices in the field. SUMMARY OF THE INVENTION
The objective of the present invention is to provide a liquid filter device, which has an improved filtering capacity. It is also an objective to provide a liquid filter device which is compact and space saving and has a simple and light construction. Further, it is an objective of the present invention to minimize the problems with operational disturbances in liquid systems of a vehicle.
It is also an objective of the present invention to provide a liquid filter device, which can be placed in connection with a liquid tank in a space saving way.
Further, it is an objective to provide a urea dosing unit which is space-saving and which comprises a filter device which can be easily changed and serviced.
Also, it is an objective with the present invention to provide a urea dosing system and/or an exhaust gas system with a space saving, robust and light construction with a decreased number of components.
Further, it is an objective to provide a vehicle having the advantages above. These objectives are achieved with a liquid filter device, reducing agent dosing unit, reducing agent dosing system and vehicle of the type specified by the features of the appended claims.
The present invention thus relates to a liquid filter device comprising a support body carrying a first filter element comprising a first filter material, which first filter element radially surrounds a hollow central tube of the support body. The hollow central tube extends between a first end portion and a second end portion of the support body. The filter device further comprises a second filter element comprising a second filter material. By arranging the filter elements to be supported by a common support body, a compact and effective filtering device for the liquid is achieved. Since the filtering efficiency is improved, it is possible to minimize the problems with operational disturbances in liquid systems of a vehicle. Further, the first and the second filter elements are integrated in the filter device, whereby a space saving filtering device is obtained. Further, a simplified service of the filter device can be obtained since both the first and the second filter elements can be changed during one service occasion. Also, the filter device of the present disclosure maximizes the filtering efficiency, since the second filter element can capture particulate material that passes the first filter element. Further, in this way particulate material that passes the first filter element will be captured already in the filter device, and the amount of particulate material entering additional components downstream of the filter device in a liquid feeding system is minimized.
According to one variant, the first filter material may have a mesh size of less than or equal to 25 μιη and/or the second filter material may have a mesh size of less than or equal to 30 μιη. In this way the filtering efficiency may be further improved.
Suitably, the second filter element is arranged such that the first filter element surrounds the second filter element. In this way, the liquid to be filtered can be fed to the second filter element via the first filter element whereby efficient filtering can be obtained. The second filter element is preferably arranged coaxially with the first filter element. By coaxial structure, the filter device will be compact and light-weight.
The filter device may have a substantially circular cylindrical shape. The first filter element therefore radially surrounds the second filter element. In this way, a symmetrical shape for the filter device is obtained, whereby the filter materials in both the first and second filter elements can be equally loaded over the surface of the filter elements. Thus, the operational lifetime of the filter elements can be prolonged.
According to one variant, the second filter element may constitute the hollow central tube. By arranging the second filter element to constitute the hollow central tube of the support body, a light, compact and simple construction for the liquid filter device is achieved. The first filter material suitably comprises or consists of nylon fibres, or comprises or consists or cellulosic fibres and is thus paper-based. These materials are commonly used in filtering devices and it is possible to obtain high filtering efficiency. The second filter material may be of the same type as the first filter material. However, it may also be of another type than the first filter material. According to one variant, the second comprises a plastic net or metallic net. These materials have a high stability and they do not loose stiffness in liquid feeding systems, which is especially advantageous if the second filter element constitutes the hollow central tube.
The filter device may further comprise a housing, which surrounds the support body carrying the first filter element and the second filter element. The housing protects the filter device and enables easy mounting of the filter device to a liquid feeding system. The first and second end portions of the support body are suitably arranged in liquid tight contact with the first filter element so that the liquid to be filtered is forced to pass through the first filter element. In this way, there are no gaps in the filter device through which the liquid could pass without filtering and thus, the filtering efficiency is further improved. Preferably, the liquid filter device is arranged to filter a reducing agent. Reducing agent is used in the selective catalytic reduction (SCR) system of the exhaust gas system and is usually an aqueous solution containing urea. The present filter device is especially adapted for the filtration of reducing agent.
The present invention further relates to a reducing agent dosing unit comprising a pump device and the liquid filter device according to the present invention and as described above. The reducing agent dosing unit may be an independently attachable or detachable unit. This means that the unit is arranged as a module in a reducing agent dosing system and can be provided as a separate component. This is a huge advantage enabling an easy maintenance and service of the pump and/or the filter device. The present invention also relates to a reducing agent dosing system for an exhaust gas system of an internal combustion engine. The reducing agent dosing system comprises a tank for the reducing agent, the reducing agent dosing unit as described above and at least one component downstream of the reducing agent dosing unit comprising an injection device arranged to inject the reducing agent into the exhaust gas system. The system is modular and each of the components can be independently attached to or detached from the system.
To further improve the filtration efficiency, the at least one component downstream of the reducing agent dosing unit preferably comprises an additional filter device comprising a screen. The mesh size of the second filter material is preferably smaller than the mesh size of the screen. In this way, the amount of particulate material captured by the screen can be minimized. The present invention also relates to a vehicle comprising the liquid filter device, reducing agent dosing unit and/or reducing agent dosing system as described above.
Further features and advantages of the present invention will be described in more detail in the detailed description below with reference to the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a schematic side view of a vehicle, which comprises a liquid filter device, reducing agent dosing unit and reducing agent dosing system for an internal combustion engine according to the present invention,
Fig. 2 shows schematically a filter device according to one aspect of the invention an a perspective view,
Fig. 3 shows the filter device of Fig. 2 from above with arrows showing schematically the flow of fluid from the surroundings towards the filter element,
Fig. 4 shows a schematic and longitudinal cut view of a filter device according to the present invention, wherein arrows showing schematically the flow of fluid inside the filter device are provided,
Fig. 5 shows in a coupling scheme for a urea dosing system comprising a urea dosing unit according to one aspect of the invention.
DETAILED DESCRIPTION
Internal combustion engines are used in various types of applications and vehicles today, e.g. in heavy vehicles such as trucks or buses, in cars, motorboats, steamers, ferries or ships. They may also be used in industrial engines and/or engine-powered industrial robots, power plants, e.g. electric power plants provided with a diesel generator, and in locomotives. Due to stricter regulations in respect of emissions, exhaust gases from the internal combustion engines need to be purified. Therefore, vehicles are provided with an exhaust gas purification system, which may comprise several components. For example, an exhaust system may be partly or completely comprised in a silencer, which is intended for an internal combustion engine and may be employed preferably in a vehicle, e.g. in a truck or bus.
According to the present invention, a vehicle is provided with an internal combustion engine and Fig. 1 depicts a vehicle 1 in a schematic side view, which is provided with an internal combustion engine 2, which powers the vehicle's tractive wheels 4 via a gearbox 6 and a propeller shaft 8. The engine 2 is provided with an exhaust gas system 10 in which a silencer 12 is fitted. The exhaust gas system 10 includes a SCR purification system (not shown) and is fluidly connected to a liquid tank 20 for a reducing agent, from which the reducing agent is supplied to the SCR purification system via a dosing system 24 comprising a dosing unit 22, which comprises a liquid filter device 23 (see Fig. 5) of the present invention and a pump 21 (see Fig. 5) arranged to feed the liquid further in the exhaust system. The liquid filter device 23 of the present invention is suitably arranged to filter the reducing agent. The engine 2 is powered by fuel 14 supplied to it via a fuel system 16 which comprises a fuel tank 18. Generally, the exhaust gas system may comprise one or more of the following components, which are suitably placed in the silencer of a vehicle. The silencer comprises an inlet for leading an exhaust gas flow into the silencer. The silencer may comprise a diesel oxidation catalyst (DOC) which may be arranged downstream of the inlet. A DOC is a unit designed to oxidize carbon monoxide, gas phase hydrocarbons and soluble organic fraction (SOF) of diesel particulate matter to C02 and H20. A diesel particulate filter (DPF) may be arranged downstream of the DOC. A DPF is a unit designed to remove diesel particulate matter or soot from the exhaust gas flow. The DPF can for example be a catalysed soot filter (CSF). Further, a selective catalytic reduction (SCR) purification system comprising a dosing system for a reducing agent of the present invention for adding a reducing agent to the exhaust gas flow in order to reduce NOx contents of the exhaust gas flow is arranged in the exhaust system. The reducing agent may be for example a urea-containing solution, such as a mixture containing water and urea, e.g. a product with the trade name AdBlue®. A mixing and vaporisation arrangement, which comprises a vaporisation chamber for mixing of the exhaust gas flow and reducing agent and for vaporization of the reducing agent is arranged downstream of the dosing system for the reducing agent. The SCR purification system comprises a SCR-substrate, which may comprise vanadium, iron, or copper catalyst, which breaks NOx down to water vapour and nitrogen. An ammonia slip catalyst (ASC), which is designed to convert the NH3 slip to N 2 and H20, may be arranged downstream of the SCR purification system. An outlet for leading the exhaust gas flow out from the silencer is arranged downstream of the ASC. The silencer may comprise several outlets. Generally, reducing agent dosing systems include at least one filter and pump to supply reducing agent to the vaporization chamber in the exhaust gas system of a vehicle. The reducing agent may be for example injected to the vaporization chamber by means of a spraying device.
The components downstream of the filter device are usually sensitive for impurities and therefore, a fine mesh filter can be provided in connection with the component, e.g. a pump or a spraying device. Due to the required compact construction of the exhaust gas system in the vehicle, the fine mesh filters are often difficult to reach and therefore serve. Therefore, there is a risk for clogging of the fine mesh filter, which leads to operational disturbances. Thus, there is a need for a reliable, easy to maintain and perform service filter device. The present filter device solves these problems. The liquid filter device of the present invention is especially adapted for filtering a reducing agent, such as a urea-containing agent, in an exhaust gas system of a vehicle.
Fig. 2 shows in a perspective view an example of a liquid filter device 23 according to the present invention. Fig. 3 shows a filter device of the present invention from above, and reference herein below is made equally to Fig. 2 and 3. The filter device 23 is arranged in fluid connection with a tank 20 comprising the reducing agent, e.g. AdBlue®, by means of a supply pump 21 (as shown in Fig. 1 and 5). The liquid filter device 23 comprises a support body 25 carrying a first filter element 26 comprising a first filter material. The support body 25 comprises a hollow central tube, which is shown in Fig. 3 from above. The first filter element 26 radially surrounds the hollow central tube 27 of the support body 25. By radially is meant that both the hollow central tube and the first filter element 26 are essentially concentric and thus have a common central point. According to one variant, the filter device may have a substantially circular cylindrical shape, i.e. the cross section of the filter device is circular. Thereby, shape of the first filter element and the second filter element adapt to the shape of the filter device. For example, when the shape is circular cylindrical, the cross section of the respective first and second filter device is spherical. However, the cross-section of the filter device may have another shape such as oval or rectangular. Suitably, the hollow central tube 27 is arranged to extend between a first end portion 31 and a second end portion 32 of the support body 26. The first end portion 31 may be provided with a collar portion 42 to enable easy mounting of the filter device for example in a filter housing 40 (shown in Fig. 4). The end portions have a shape in a plane, which is perpendicular to a plane extending in a longitudinal extension L (see Fig. 4) of the filter device, corresponding to the outer periphery of the first filter element. According to the present invention, the filter device 23 further comprises a second filter element 28 comprising a second filter material. In this way, further filtration of the reducing agent can be provided in a compact manner. The second filter element 28 is arranged such that the first filter element 26 surrounds the second filter element 28. Also, the second filter element 28 is arranged coaxially with the first filter element 26, and this can be seen best in Fig. 4 in which a longitudinal axis L, which corresponds to a common central axis for the first and second filter elements 26, 28, is shown. In an embodiment, the second filter element 28 constitutes the hollow central tube 27. Thus, the first and second end portions 31, 32 are connected and attached to the second filter element 28. The first filter material may have a finer mesh size than the second filter material and can be for example a mesh size of less than or equal to 25 μιη. In this way, most of the impurities in form of particles can be captured by the first filter element. However, there is always a risk that a small amount, such as about 1% of the total amount of the particles, will pass the first filter element. When these particles accumulate later on in small filter devices or screens arranged in connection with components downstream of the filter device, there is a risk for clogging of the small filter devices or screens. Therefore, a second filter element is suitably arranged downstream of the first filter element in the filter device of the present invention. The second filter material may have a mesh size which is slightly coarser than the mesh size of the first filter element and ca be for example a mesh size of less than or equal to 30 μιη. In this way, the risk for particulate impurities clogging small filter devices in connection with components downstream of the filter device is minimized. However, the mesh size of the filter elements could be the same or the mesh size of the first filter element could be coarser than the mesh size of the second filter element.
The first filter material may be of any suitable kind and may for example comprise nylon fibres and/or it may be paper-based or comprise cellulosic fibres. The second filter material may be of the same kind as the first filter material or it may be different and may comprise for example plastic and/or metallic net.
When the filter device is in use, the liquid to be filtered is arranged to enter the first filter element through the peripheral surface of the first filter element 26. The entrance of the liquid to the filter device 23 is illustrated in Fig. 3 from above by means of arrows. Suitably, the liquid is arranged to enter the filter device 23 substantially symmetrically along the periphery of the first filter element 26 so that the filter element 26 is loaded evenly.
Fig. 4 illustrates how the liquid travels inside the filter device. According to the variant shown in Fig. 4, the filter device 23 further comprises a housing 40, which surrounds the support body 25 carrying the first filter element 26 and the second filter element 28. The filter device is arranged in fluid connection with the liquid tank 20 and the housing 40 comprises an opening 43 through which the liquid is supplied to the first and second filter elements 26, 28. The liquid passes the first filter element 26 and subsequently the second filter element 28 and the purified liquid is supplied through an outlet 41 in the collar portion 42 further to at least one additional component, such as an injection device, arranged to inject the reducing agent into the exhaust gas system. There are optionally further components arranged downstream of the liquid filter device. The liquid may be fed in a direction perpendicular to the longitudinal axis L of the filter device, or it can be fed tangentially at an angle in respect of the longitudinal axis L of the filter device such that the liquid flow is directed towards the outlet 41 of the filter device 23. The first and second end portions 31, 32 of the support body 25 are preferably arranged in liquid tight contact with the first filter element 26 so that the liquid to be filtered is forced to pass through the first filter element 26. This means that there is no gap between the respective end portion 31 and/or 32 and the first filter element 26 and the liquid must pass through the first filter element. In this way all liquid is filtered at least by the first filter element. In a similar way however, the second filter element 28 can be arranged in liquid tight contact with the respective first and/or second end portion 31, 32 of the support body 25.
The present invention further relates to a reducing agent dosing unit shown schematically in Fig. 5. The reducing agent dosing unit 22 comprises a pump device 21 arranged to pump the reducing agent from the tank 20 for the reducing agent and the liquid filter device 23 as described above. The dosing unit 22 is preferably contained in a unit housing 51, which surrounds the pump and the filter device 23. The first filter element 26 and the second filter element 28 of the filter device 23 are arranged in the housing 40. Preferably, the reducing agent dosing unit is an independently attachable or detachable unit. Thus, the dosing unit 22 may comprise detachable attachment means (not shown) that enable attachment and detachment of the unit to pipelines in the exhaust system in an easy way. Also, the filter device 23 and the pump device 21 may be detachably arranged in the dosing unit 22, whereby easy maintenance and service can be performed. In this way, a modular dosing unit with exchangeable filter device and pump device is provided. The housing 40 and the unit housing 51 are manufactured of any suitable material that tolerates the environment in an exhaust gas system of a vehicle and may comprise plastic material and/or metal. The present invention further relates to a reducing agent dosing system 24 for an exhaust gas system of an internal combustion engine, which comprises a tank 20 for the reducing agent, the reducing agent dosing unit 22 and at least one additional component downstream of the reducing agent dosing unit 22. It the additional components an injection device 60 arranged to inject the reducing agent into the exhaust gas system is included. Suitably, the injection device provides the reducing agent into the exhaust gas flow in a vaporization chamber of a SCR system, whereby the NOx-content of the exhaust gas flow can be reduced. Suitably, the at least one component downstream of the reducing agent dosing unit 22 comprises a filter device 62 comprising a screen. In this way, the component can be further protected from particulate impurities. Preferably, the mesh size of the second filter material in the second filter element 28 is smaller than the mesh size of the screen. In this way, most of the particulate material can be captured by the filter device 23, but the particulate matter present in the system 24 will be captured by the filter device 62, and thus the additional component 60 will be protected.
The foregoing description of the present invention is provided for illustrative and descriptive purposes. It is not intended to be exhaustive or to restrict the invention to the variants described. Many modifications and variations will obviously be apparent to one skilled in the art. The embodiments have been chosen and described in order best to explain the principles of the invention and its practical applications and hence make it possible for a skilled person to understand the invention for various embodiments and with the various modifications appropriate to the intended use.

Claims

1. A liquid filter device (23) comprising a support body (25) carrying a first filter element (26) comprising a first filter material, which first filter element (26) surrounds a hollow central tube (27) of the support body (25), which hollow central tube (27) extends between a first end portion (31) and a second end portion (32) of the support body (25), wherein the filter device (23) comprises a second filter element (28) comprising a second filter material, characterized in that the second filter element (28) is arranged such that the first filter element (26) surrounds the second filter element (28) and the first filter material have a finer mesh size than the second filter material.
2. Liquid filter device according to claim 1, characterized in that the second filter element (28) is arranged coaxially with the first filter element (26).
3. Liquid filter device according to any of the preceding claims, characterized in that the filter device (23) has a substantially circular cylindrical shape, and wherein the first filter element (26) radially surrounds the second filter element (28).
4. Liquid filter device according to any of the preceding claims, characterized in that the second filter element (28) constitutes the hollow central tube (27).
5. Liquid filter device according to any of the preceding claims, characterized in that the first filter material comprises nylon fibres or is paper-based and/or the second filter material comprises a plastic or metallic net.
6. Liquid filter device according to any of the preceding claims, characterized in that the filter device (23) further comprises a housing (40) which surrounds the support body (25) carrying the first filter element (26) and the second filter element (28).
7. Liquid filter device according to claim 6, characterized in that the first and second end portions (31; 32) of the support body (25) are arranged in liquid tight contact with the first filter element (26) so that the liquid to be filtered is forced to pass through the first filter element (26).
8. Liquid filter device according to any of the preceding claims, characterized in that the liquid filter device (23) is arranged to filter a reducing agent.
9. A reducing agent dosing unit (22) comprising a pump device (21) and the liquid filter device (23) according to any one of claims 1-8.
10. The reducing agent dosing (22) unit of claim 9, wherein the reducing agent dosing unit (22) is independently attachable or detachable unit.
11. A reducing agent dosing system (24) for an exhaust gas system (10) of an internal combustion engine (2), the reducing agent dosing system (24) comprising a tank (20) for the reducing agent, the reducing agent dosing unit (22) of claim 9 or 10 and at least one additional component downstream of the reducing agent dosing unit (22), the additional component being an injection device (60) arranged to inject the reducing agent into the exhaust gas system and optionally a further component.
12. The reducing agent dosing system (24) according to 11, characterized in that the at least one additional component downstream of the reducing agent dosing unit (22) comprises a filter device (62) comprising a screen.
13. The reducing agent dosing system (24) according to 12, characterized in that the mesh size of the second filter material is smaller than the mesh size of the screen.
14. Vehicle (1), characterized in that it comprises the liquid filter device (23) of any one of claims 1-8, the reducing agent dosing (22) unit of any of claims 9 to 10, and/or the reducing agent dosing system (24) of any one of claims 11-13.
PCT/SE2018/050050 2017-02-07 2018-01-23 Liquid filter device, reducing agent dosing unit, reducing agent dosing system and a vehicle comprising the liquid filter device WO2018147778A1 (en)

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SE1750102A SE542419C2 (en) 2017-02-07 2017-02-07 Reducing agent dosing unit comprising a pump device and a liquid filter device
SE1750102-4 2017-02-07

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Citations (6)

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WO2007126366A1 (en) * 2006-04-27 2007-11-08 Volvo Lastvagnar Ab A liquid receptacle for a vehicle
WO2012153202A1 (en) * 2011-05-10 2012-11-15 Filtertek Fluid filtration unit
US8875502B2 (en) * 2010-12-14 2014-11-04 Cummins Ltd. SCR exhaust gas aftertreatment device
DE102013214634A1 (en) * 2013-07-26 2015-01-29 Robert Bosch Gmbh Filter device with a signal device with a signal transition

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2015890A (en) * 1978-03-08 1979-09-19 Ecodyne Corp Filter Element and Liquid Purification Method
DE102005036187A1 (en) * 2005-08-02 2007-02-08 Robert Bosch Gmbh Diesel fuel filter cartridge for e.g. passenger car, has coarse filter unit with large filter pores arranged upstream of fine mesh filter unit, where water contained in fuel flows via pores and coarse dust particles are retained in pores
WO2007126366A1 (en) * 2006-04-27 2007-11-08 Volvo Lastvagnar Ab A liquid receptacle for a vehicle
US8875502B2 (en) * 2010-12-14 2014-11-04 Cummins Ltd. SCR exhaust gas aftertreatment device
WO2012153202A1 (en) * 2011-05-10 2012-11-15 Filtertek Fluid filtration unit
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