WO2015012756A1 - Arrangement for use with an air filter - Google Patents

Arrangement for use with an air filter Download PDF

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Publication number
WO2015012756A1
WO2015012756A1 PCT/SE2014/050751 SE2014050751W WO2015012756A1 WO 2015012756 A1 WO2015012756 A1 WO 2015012756A1 SE 2014050751 W SE2014050751 W SE 2014050751W WO 2015012756 A1 WO2015012756 A1 WO 2015012756A1
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WO
WIPO (PCT)
Prior art keywords
air
flow
arrangement
precleaner
control
Prior art date
Application number
PCT/SE2014/050751
Other languages
French (fr)
Inventor
Jim NORDENVALL
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 WO2015012756A1 publication Critical patent/WO2015012756A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/08—Air cleaners with means for removing dust, particles or liquids from cleaners; with means for indicating clogging; with by-pass means; Regeneration of cleaners
    • F02M35/086—Dust removal by flushing, blasting, pulsating or aspirating flow, washing or the like; Mechanical dust removal, e.g. by using scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/022—Air cleaners acting by gravity, by centrifugal, or by other inertial forces, e.g. with moistened walls
    • F02M35/0223—Air cleaners acting by gravity, by centrifugal, or by other inertial forces, e.g. with moistened walls by centrifugal forces, e.g. cyclones
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/16—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines characterised by use in vehicles
    • F02M35/164—Heavy duty vehicles, e.g. trucks, trains, agricultural or construction machines

Definitions

  • the present invention concerns an arrangement according to the introduction of the independent claim, and to be more specific an arrangement to be used with a precleaner in an air filter in order to separate particles from a requested flow of air to a combustion engine.
  • a precleaner constitutes a part of the air cleaner and is located upstream of a main filter (sometimes known as a “filter cartridge”) in the air cleaner and that separates by centrifugal force larger particles from the air before it is filtered in the filter cartridge.
  • a main filter sometimes known as a “filter cartridge”
  • An ejector increases the mass flow of air through the precleaner, and this increases the efficiency.
  • the flow of air through the ejector is currently achieved by, for example, connecting the ejector in the precleaner to the final pipe of the exhaust gas system, which leads to contaminated air being withdrawn by suction from the ejector and subsequently passed out through the exhaust gases and in this way increasing the mass flow through the precleaner.
  • a second disadvantage of such a solution (to connect the ejector to the exhaust gas system) is that also engines with a low mass flow of air will have a lower efficiency of the ejector, since the venturi effect in the exhaust gas pipe will be small when the mass flow is small.
  • the following patent documents reveal examples of the use of precleaners in air- purification arrangements.
  • GB1491 157 shows a precleaner that separates by centrifugal force and that is emptied of the dust that has been separated out with the aid of a suction fan.
  • EP2136066 shows a precleaner that separates by centrifugal force and that is cleaned by an arrangement.
  • the arrangement comprises a fan and is used together with a venturi device in order to withdraw the contaminants from the precleaner by suction.
  • US1530645 shows that as an alternative to a venturi pipe in the exhaust gas system to withdraw particles by suction from an air cleaner that separates by centrifugal force, a fan in combination with venturi pipes can be used, or a fan alone.
  • EP1918009 shows a precleaner that separates particles from the air by centrifugal force. Large particles in the vicinity of the outer wall of the precleaner are withdrawn by suction with the aid of the cooling fan.
  • US5472463 shows a precleaner that is cleaned through an electrically powered fan withdrawing the particles by suction.
  • the purpose of the present invention is to achieve an improved arrangement to be used with air cleaners that demonstrates advantages with respect to energy and design when compared with currently used systems.
  • the invention concerns an electrically powered fan to eject particles from precleaners.
  • the ejecting fan increases the efficiency of the precleaner by increasing the flow of air through the precleaner and in this way increasing the centrifugal force that contributes to an increasing degree of cleaning for the precleaner, at the same time as it withdraws contaminated air by suction.
  • the electrical ejector according to the invention demonstrates control that is controlled by the demand, i.e. it is activated at a specified mass flow of air and it then supplies a capacity of a predetermined fraction, such as 10%, of the mass flow of air that has been requested by the turbo.
  • the arrangement according to the invention is fully independent of the design of the exhaust gas system and it works with all installations.
  • the performance of the precleaner is improved, which means that the interval at which the air filter of the vehicle must be changed is extended.
  • Vehicles that currently cannot be fitted with a precleaner with an ejector due to difficulties in installing connections to the exhaust gas system can install such a precleaner with the arrangement according to the invention and in this way significantly improve the performance of the air filter.
  • the ejector effect is controlled by demand, which ensures that an ejector effect is obtained when it is needed and when it has the greatest effect.
  • Figure 1 shows a schematic block diagram that illustrates the present invention.
  • Figure 2 shows a schematic cross-section that illustrates an embodiment of the present invention.
  • Figure 3 shows a schematic cross-section of a precleaner in an air filter that illustrates a second embodiment of the invention.
  • the invention concerns an arrangement 2 that is shown schematically in Figure 1 .
  • the arrangement is intended to be used during precleaning in an air filter 4 for an air intake of a requested flow of air 6 to a combustion engine, through a carburettor arrangement or through a fuel injection system.
  • the combustion engine is not shown in the drawings since it is in itself a known arrangement with known function, and thus does not need to be described in detail here.
  • the arrangement 2 comprises an ejector 8 adapted to withdraw by suction a second flow of air 10 with air and particles from a precleaner 12 in the said air filter 4 and a suction withdrawal unit 14 arranged in connection with the ejector 8 and adapted to generate the second flow of air 10 from the precleaner 12.
  • the arrangement 2 further comprises a control unit 16 adapted to control the second flow of air 10 for the suction withdrawal unit 14 by means of a control signal 18.
  • the control of the second flow of air 10 takes place according to predetermined control rules, depending on one or several parameters 20 related to the operation of the combustion engine.
  • the air filter 4 is an air filter of a commonly used type that comprises a main filter 22 in connection with the precleaner and that the precleaner 12 is adapted to clean the air before it arrives at the main filter 22.
  • the precleaner 12 is adapted to separate particles from the air by centrifugal force to a radially located external part of the precleaner 12 and that the said ejector 8 is arranged in the said external part in order to withdraw the second flow of air 10 by suction.
  • the main filter 22 has further an opening for the input by suction of a flow of air 23 that constitutes the sum of the requested flow of air 6 and the second flow of air 10.
  • the said parameters 20 comprise the requested flow of air 6 for the carburettor arrangement.
  • the magnitude of the requested flow of air 6 depends, of course, on, among other things, the engine power, the requested rate of revolution of the engine, the load on the engine, etc.
  • a normal flow of air for lorries lies in the interval 15-35 m 3 /minute, depending on the engine power, and for buses it lies in the interval 15-28 m 3 /minute.
  • a flow of air of 10 m 3 /minute is regarded as a low flow of air.
  • the said parameters 20 comprise a requested rate of revolution of the combustion engine.
  • the said parameters 20 comprise the load placed on the combustion engine.
  • the requested rate of revolution of the engine and the engine load may, for example, be used in combination with engine size and a requested flow of air.
  • the parameters are preferably available for the control unit from the CAN bus of the vehicle (not shown in the drawings).
  • the control rules preferably comprise a rule that involves comparing the said requested flow of air 6 to the carburettor arrangement with a threshold value for the requested flow of air 6, and if the requested flow of air 6 lies below the threshold value the said second flow of air 10 is controlled such that it becomes zero.
  • the threshold value may be, for example, a requested flow of air that is at a low level, as has been shown by example above.
  • the control of the second flow of air according to demand is achieved. To be more specific, this takes place through the control rules being adapted to control the second flow of air 10 such that it constitutes a predetermined part of the requested flow of air 6.
  • the predetermined part lies in the interval 5-15%, preferably in the interval 8-12%, for example, approximately 10%.
  • the second flow of air can be achieved by the suction withdrawal unit 14 in several different ways.
  • the suction withdrawal unit 14 is constituted by a fan that can generate the second flow of air either directly or indirectly. It is preferable that the fan be electrically powered. Of course, also pneumatic and hydraulically driven fans may be used.
  • the schematic block diagram in Figure 2 shows an embodiment in which the suction withdrawal unit 14 is constituted by a fan that has been mounted in a pipe connection that is connected to the ejector 8, i.e. the fan generates a direct flow of air that withdraws air from the precleaner by suction.
  • the fan is controlled by the control signal 18 such that the desired second flow of air 10 is achieved.
  • the second flow of air 10 is instead achieved indirectly.
  • the fan 14 is located in this case such that it inhales by suction air from the surroundings and the flow (illustrated by arrows) that is then generated in an outer pipe 24 gives rise to negative pressure in the opening of an inner pipe 26 that opens out into the outer pipe. The negative pressure generates a flow, the second flow 10, in the inner pipe 26.
  • the inlet opening 28 of the outer pipe may be, for example mounted in the engine compartment of the combustion engine. Such a mounting contributes to reducing the temperature in the engine compartment, which has positive effects for the lifetime of the engine components.
  • a net 28 is preferably arranged at the inlet opening in order to prevent particles being drawn by suction into the outer pipe.
  • a fan is required that manages to cope with only 10% of the mass flow of air requested by the carburettor.
  • the fan is not located in the second flow of air. This leads to it being necessary to have a higher mass flow than is the case for the fan shown in Figure 2. According to one example, the efficiency of the installation according to Figure 3 would be approximately 10% and this would mean that the capacity of the fan would need to be of the same magnitude as that needed in order to achieve the requested flow of air.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

An arrangement (2) for precleaning in an air filter (4) for the air intake of a requested flow of air (6) to a combustion engine. The arrangement (2) comprises an ejector (8) adapted to withdraw by suction a second flow of air (10) with air and particles from a precleaner (12) in the said air filter (4), and a suction withdrawal unit (14) arranged in connection with the said ejector (8) and adapted to generate the said second flow of air (10) from the said precleaner (12). The arrangement (2) further comprises a control unit (16) adapted to control the said second flow of air (10) for the said suction withdrawal unit (14) by means of a control signal (18), whereby the control unit (16) is adapted to control the said second flow of air (10) according to predetermined control rules, depending on one or several parameters (20) related to the operation of the combustion engine.

Description

Title
Arrangement for use with an air filter Technical area
The present invention concerns an arrangement according to the introduction of the independent claim, and to be more specific an arrangement to be used with a precleaner in an air filter in order to separate particles from a requested flow of air to a combustion engine. Background to the invention
What is known as an "ejector" improves the efficiency of an air cleaner with a precleaner. A precleaner constitutes a part of the air cleaner and is located upstream of a main filter (sometimes known as a "filter cartridge") in the air cleaner and that separates by centrifugal force larger particles from the air before it is filtered in the filter cartridge.
An ejector increases the mass flow of air through the precleaner, and this increases the efficiency. The flow of air through the ejector is currently achieved by, for example, connecting the ejector in the precleaner to the final pipe of the exhaust gas system, which leads to contaminated air being withdrawn by suction from the ejector and subsequently passed out through the exhaust gases and in this way increasing the mass flow through the precleaner.
In installations in which the air inlet and the exhaust gas system are widely separated from each other it is sometimes difficult to achieve a high efficiency of the ejector since a long and complicated pipeline can lead to the ejector having no effect.
A second disadvantage of such a solution (to connect the ejector to the exhaust gas system) is that also engines with a low mass flow of air will have a lower efficiency of the ejector, since the venturi effect in the exhaust gas pipe will be small when the mass flow is small. The following patent documents reveal examples of the use of precleaners in air- purification arrangements.
GB1491 157 shows a precleaner that separates by centrifugal force and that is emptied of the dust that has been separated out with the aid of a suction fan.
EP2136066 shows a precleaner that separates by centrifugal force and that is cleaned by an arrangement. The arrangement comprises a fan and is used together with a venturi device in order to withdraw the contaminants from the precleaner by suction.
US1530645 shows that as an alternative to a venturi pipe in the exhaust gas system to withdraw particles by suction from an air cleaner that separates by centrifugal force, a fan in combination with venturi pipes can be used, or a fan alone.
EP1918009 shows a precleaner that separates particles from the air by centrifugal force. Large particles in the vicinity of the outer wall of the precleaner are withdrawn by suction with the aid of the cooling fan.
US5472463 shows a precleaner that is cleaned through an electrically powered fan withdrawing the particles by suction.
The purpose of the present invention is to achieve an improved arrangement to be used with air cleaners that demonstrates advantages with respect to energy and design when compared with currently used systems.
Summary of the invention
The purposes stated above are achieved with the invention defined by the independent patent claim.
Preferred embodiments are defined by the non-independent claims. The invention concerns an electrically powered fan to eject particles from precleaners. The ejecting fan increases the efficiency of the precleaner by increasing the flow of air through the precleaner and in this way increasing the centrifugal force that contributes to an increasing degree of cleaning for the precleaner, at the same time as it withdraws contaminated air by suction.
The electrical ejector according to the invention demonstrates control that is controlled by the demand, i.e. it is activated at a specified mass flow of air and it then supplies a capacity of a predetermined fraction, such as 10%, of the mass flow of air that has been requested by the turbo.
At a low mass flow of air, a smaller amount of dust is drawn by suction into the inlet system, and if the ejector were to be activated in this case it would be solely an unnecessary consumption of energy.
The arrangement according to the invention is fully independent of the design of the exhaust gas system and it works with all installations.
The performance of the precleaner is improved, which means that the interval at which the air filter of the vehicle must be changed is extended.
Vehicles that currently cannot be fitted with a precleaner with an ejector due to difficulties in installing connections to the exhaust gas system (including buses and other vehicles) can install such a precleaner with the arrangement according to the invention and in this way significantly improve the performance of the air filter.
The ejector effect is controlled by demand, which ensures that an ejector effect is obtained when it is needed and when it has the greatest effect.
Brief description of drawings
Figure 1 shows a schematic block diagram that illustrates the present invention. Figure 2 shows a schematic cross-section that illustrates an embodiment of the present invention. Figure 3 shows a schematic cross-section of a precleaner in an air filter that illustrates a second embodiment of the invention.
Detailed description of preferred embodiments of the invention
The invention will be described in detail below with reference to the attached drawings.
The same or similar features have systematically been given the same reference numbers in the drawings. The invention concerns an arrangement 2 that is shown schematically in Figure 1 . The arrangement is intended to be used during precleaning in an air filter 4 for an air intake of a requested flow of air 6 to a combustion engine, through a carburettor arrangement or through a fuel injection system. The combustion engine is not shown in the drawings since it is in itself a known arrangement with known function, and thus does not need to be described in detail here.
The arrangement 2 comprises an ejector 8 adapted to withdraw by suction a second flow of air 10 with air and particles from a precleaner 12 in the said air filter 4 and a suction withdrawal unit 14 arranged in connection with the ejector 8 and adapted to generate the second flow of air 10 from the precleaner 12.
The arrangement 2 further comprises a control unit 16 adapted to control the second flow of air 10 for the suction withdrawal unit 14 by means of a control signal 18. The control of the second flow of air 10 takes place according to predetermined control rules, depending on one or several parameters 20 related to the operation of the combustion engine.
The air filter 4 is an air filter of a commonly used type that comprises a main filter 22 in connection with the precleaner and that the precleaner 12 is adapted to clean the air before it arrives at the main filter 22. The precleaner 12 is adapted to separate particles from the air by centrifugal force to a radially located external part of the precleaner 12 and that the said ejector 8 is arranged in the said external part in order to withdraw the second flow of air 10 by suction. The main filter 22 has further an opening for the input by suction of a flow of air 23 that constitutes the sum of the requested flow of air 6 and the second flow of air 10. According to one embodiment the said parameters 20 comprise the requested flow of air 6 for the carburettor arrangement. The magnitude of the requested flow of air 6 depends, of course, on, among other things, the engine power, the requested rate of revolution of the engine, the load on the engine, etc. A normal flow of air for lorries lies in the interval 15-35 m3/minute, depending on the engine power, and for buses it lies in the interval 15-28 m3/minute. A flow of air of 10 m3/minute is regarded as a low flow of air.
According to another embodiment, the said parameters 20 comprise a requested rate of revolution of the combustion engine.
According to yet another embodiment, the said parameters 20 comprise the load placed on the combustion engine.
It is often a combination of several parameters that is used. The requested rate of revolution of the engine and the engine load may, for example, be used in combination with engine size and a requested flow of air.
Several parameters of the said parameters may, of course, be used at the same time in order to achieve activation of the suction withdrawal unit 14 that is controlled by demand.
The parameters are preferably available for the control unit from the CAN bus of the vehicle (not shown in the drawings). The control rules preferably comprise a rule that involves comparing the said requested flow of air 6 to the carburettor arrangement with a threshold value for the requested flow of air 6, and if the requested flow of air 6 lies below the threshold value the said second flow of air 10 is controlled such that it becomes zero. The threshold value may be, for example, a requested flow of air that is at a low level, as has been shown by example above. According to another control rule, the control of the second flow of air according to demand is achieved. To be more specific, this takes place through the control rules being adapted to control the second flow of air 10 such that it constitutes a predetermined part of the requested flow of air 6. The predetermined part lies in the interval 5-15%, preferably in the interval 8-12%, for example, approximately 10%.
The second flow of air can be achieved by the suction withdrawal unit 14 in several different ways. According to one variant, the suction withdrawal unit 14 is constituted by a fan that can generate the second flow of air either directly or indirectly. It is preferable that the fan be electrically powered. Of course, also pneumatic and hydraulically driven fans may be used.
The schematic block diagram in Figure 2 shows an embodiment in which the suction withdrawal unit 14 is constituted by a fan that has been mounted in a pipe connection that is connected to the ejector 8, i.e. the fan generates a direct flow of air that withdraws air from the precleaner by suction. The fan is controlled by the control signal 18 such that the desired second flow of air 10 is achieved. In the schematic block diagram shown in Figure 3, the second flow of air 10 is instead achieved indirectly. The fan 14 is located in this case such that it inhales by suction air from the surroundings and the flow (illustrated by arrows) that is then generated in an outer pipe 24 gives rise to negative pressure in the opening of an inner pipe 26 that opens out into the outer pipe. The negative pressure generates a flow, the second flow 10, in the inner pipe 26.
The inlet opening 28 of the outer pipe may be, for example mounted in the engine compartment of the combustion engine. Such a mounting contributes to reducing the temperature in the engine compartment, which has positive effects for the lifetime of the engine components. A net 28 is preferably arranged at the inlet opening in order to prevent particles being drawn by suction into the outer pipe. A comparison between the two embodiments that are illustrated in Figures 2 and 3 with respect to the power that it must be possible for the fan to generate reveals the following differences.
In the embodiment shown in Figure 2, a fan is required that manages to cope with only 10% of the mass flow of air requested by the carburettor.
In the embodiment shown in Figure 3, the fan is not located in the second flow of air. This leads to it being necessary to have a higher mass flow than is the case for the fan shown in Figure 2. According to one example, the efficiency of the installation according to Figure 3 would be approximately 10% and this would mean that the capacity of the fan would need to be of the same magnitude as that needed in order to achieve the requested flow of air.
The present invention is not limited to the preferred embodiments described above. Various alternatives, modifications and equivalents can be used. The embodiments above are, therefore, not to be considered as limiting the protective scope of the invention, which is defined by the attached patent claims.

Claims

Claims
1 . An arrangement (2) for precleaning in an air filter (4) for the air intake of a requested flow of air (6) to a combustion engine, where the arrangement (2) comprises:
- an ejector (8) adapted to withdraw by suction a second flow of air (10) with air and particles from a precleaner (12) in the said air filter (4),
- a suction withdrawal unit (14) arranged in connection with the said ejector (8) and adapted to generate the said second flow of air (10) from the said precleaner (12),
characterised in that the arrangement (2) comprises
- a control unit (16) adapted to control the said second flow of air (10) for the said suction withdrawal unit (14) by means of a control signal (18), whereby the control unit (16) is adapted to control the said second flow of air (10) according to predetermined control rules, depending on one or several parameters (20) related to the operation of the combustion engine.
2 The arrangement (2) according to claim 1 , whereby the said parameters (20) comprise the said requested flow of air (6) to the combustion engine.
3 The arrangement (2) according to claim 1 or 2, whereby the said parameters (20) comprise the requested rate of revolution of the combustion engine. 4 The arrangement (2) according to any one of claims 1 -3, whereby the said parameters (20) comprise the load placed on the combustion engine.
5 The arrangement (2) according to any one of claims 1 -4, whereby the control rules comprise comparing the said requested flow of air (6) to the carburettor arrangement with a threshold value for the requested flow of air (6), and if the requested flow of air (6) lies below the said threshold value, the said second flow of air (10) is controlled such that it becomes zero. 6 The arrangement (2) according to any one of claims 1 -5, whereby the said control rules are adapted to control the said second flow of air (10) such that it constitutes a predetermined part of the requested flow of air (6).
7 The arrangement (2) according to claim 6, whereby the said predetermined part lies in the interval 5-15%, preferably in the interval 8-12%.
8 The arrangement (2) according to any one of claims 1 -7, whereby the said suction withdrawal unit (14) is a fan.
9 The arrangement (2) according to any one of claims 1 -8, whereby the said air filter (4) comprises a main filter (22) and that the said precleaner (12) is adapted to clean the air before it arrives at the main filter (22).
10 The arrangement (2) according to any one of claims 1 -9, whereby the precleaner (12) is adapted to separate particles from the air by centrifugal force to a radially located external part of the precleaner (12) and that the said ejector (8) is arranged in the said external part.
PCT/SE2014/050751 2013-07-23 2014-06-18 Arrangement for use with an air filter WO2015012756A1 (en)

Applications Claiming Priority (2)

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SE1350910A SE538986C2 (en) 2013-07-23 2013-07-23 Arrangements in connection with air filters
SE1350910-4 2013-07-23

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Cited By (1)

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US10227958B2 (en) 2016-01-15 2019-03-12 Agco International Gmbh Pre-filter system for a vehicle

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SE541332C2 (en) * 2017-11-15 2019-07-09 Scania Cv Ab Cyclone separator and Related Devices

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US3469566A (en) * 1967-01-19 1969-09-30 Hastings Mfg Co Centrifugal air precleaner with blower
JP2005163597A (en) * 2003-12-02 2005-06-23 Komatsu Ltd Centrifugal dust separation device
EP1978222A2 (en) * 2007-03-28 2008-10-08 United Technologies Corporation Particle separator and debris control system
US20090101013A1 (en) * 2007-10-23 2009-04-23 Moredock James G Powered air cleaning system and air cleaning method
WO2009141247A1 (en) * 2008-05-20 2009-11-26 Agco Sa Air intake system
WO2013102169A2 (en) * 2011-12-30 2013-07-04 Rolls-Royce North American Technologies Inc. Blower for use with air particle separator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3469566A (en) * 1967-01-19 1969-09-30 Hastings Mfg Co Centrifugal air precleaner with blower
JP2005163597A (en) * 2003-12-02 2005-06-23 Komatsu Ltd Centrifugal dust separation device
EP1978222A2 (en) * 2007-03-28 2008-10-08 United Technologies Corporation Particle separator and debris control system
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SE1350910A1 (en) 2015-01-24

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