• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Summary A method in a processing unit (2) for a fuel system (4) for an internal combustion engine (6), wherein the fuel system (4) comprises a fuel tank system (8) with at least one main tank (9) intended for fuel, and a fuel filter (16 ) through which the pumped fuel is intended to pass, the fuel filter (16) comprises a water separating part intended to separate water Than fuel, and a food unit (18) arranged in connection with the fuel filter (16), and that the processing unit (2) comprises a memory unit (24) and an analysis unit (26). The method comprises the steps of: performing, with the feed unit, feedings of one or more parameters related to the separated water; determine the food value for said parameters; generating a food signal comprising said food host; - receiving said food signal in the processing unit; storing said food value in the memory unit; analyzing said stored values in the analysis unit using a set of predetermined rules related to the function of the industry filter and / or the water content of the industry; generating an indication signal in the dependent analysis, the indication signal comprising information related to the function of the industry filter and / or the water content of the industry. (Figure 1)
    公开号:SE1351002A1
    申请号:SE1351002
    申请日:2013-08-30
    公开日:2015-03-01
    发明作者:Dan Cedfors
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    Title A method for a processing unit in connection with water separation in an industry filter, and the said processing unit.
    FIELD OF THE INVENTION The present invention relates to a method in connection with a processing unit, and a processing unit, according to the preambles of the independent claims. The processing unit and the method according to the invention are in particular adapted to be applied in connection with vehicles, for example trucks and buses, but can also be used in other applications where internal combustion engines are used, for example on ships and in industry.
    Background of the Invention Internal combustion engines combust an air / fuel mixture in a plurality of cylinders to drive pistons which generate a driving torque. Air is sucked into an intake manifold through an inlet and fuel is then injected into the intake manifold or directly into the cylinders (direct injection) to create the air / fuel mixture. A fuel system is used to adapt the fuel flow to be injected to obtain a desired air / fuel mixture to the cylinders.
    The fuel system often contains one or more fuel tanks, fuel pumps, fuel filters and fuel injectors. For example, a low pressure fuel pump can pull the fuel Than a fuel tank, pressurize the fuel and feed fuel with added pressure to an injector or a high pressure fuel pump.
    A high pressure fuel pump further increases the pressure and feeds the fuel to one or more injectors.
    With today's high pressure and sensitive tolerance bands on injection systems, it is a requirement with water separation in the fuel system's low pressure circuit in connection with filtration.
    An example of an industry system with an industry filter is described in the following documents.
    WO-2012/023638 relates to a device for protecting an engine against the influence of fuel with too high a water content by lowering the speed of the engine if water content in the industry is detected. More specifically, the device comprises a sensor for detecting the water content in the industry. The sensor generates a detection signal depending on the feeds and a control signal is generated for decreasing the speed depending on the detection signal. Furthermore, the driver can get an indication if the water separation does not work as intended.
    As the requirements increase both for long service intervals on industry filters and high efficiency on water separation, it is not always possible that these two requirements can be met. It is common today to drive until the industry filter is clogged, and then the water separation is too long at an unacceptable level due to the degradation of the filter. This means that you have a kid on the aqueous fuel into the injection system with 15 incipient injuries as -160.
    The object of the present invention is to improve the current industry system by previously obtaining an indication of the function of the industry filter and also to obtain an indication of the water content of the industry.
    SUMMARY OF THE INVENTION The above objects are achieved by the invention defined by the independent claims.
    Preferred embodiments are defined by the dependent claims.
    The present invention is preferably applicable in a fuel system of a type which may be termed a controllable pressure system where the fuel pump is controlled independently of the notary.
    The present invention improves the ability to detect and diagnose a pre-collected water separation from the industry in the industry filter. Another advantage of the invention is that it makes it possible to detect early if the industry has an unacceptably high water content.
    According to one embodiment, the invention allows the system to optimize itself more adaptively with respect to the water separation by lowering the flow / pressure on the fuel pump so that the water separates better over time.
    Brief Description of the Drawings Figure 1 is a river diagram schematically showing the method of the present invention.
    Figure 2 is a block diagram schematically illustrating the present invention. Figure 3 is a block diagram schematically illustrating an embodiment of the present invention.
    Figure 4 is a schematic view of a vehicle in which the present invention has been implemented.
    Figure 5 is a graph illustrating aspects of the present invention.
    DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION In the figures, details with the same or similar function and design have consistently been given the same reference numerals.
    Initially, a general description of an industry system in which the invention is applicable will follow, followed by a detailed description of preferred embodiments of the invention with reference to the accompanying drawings.
    In many of today's vehicles, the fuel pump is arranged next to the engine and sucks up the fuel. Often the fuel pump is mechanically connected to the motor and is driven by the motor drive shaft. In another type of fuel system for internal combustion engines, the fuel pump is instead arranged in connection with the main tank and pressurizes the fuel via fuel lines to the engine. In this type of fuel system, the fuel punch is often electrically, pneumatically or hydraulically driven, and is driven independently of the drive shaft of the internal combustion engine.
    The present invention is particularly applicable to this second type of industry system, i.e. where the fuel pump is arranged adjacent to the main tank and pushes the fuel to the engine. The fuel pump is, for example, electrically, pneumatically or hydraulically driven independently of the drive shaft of the internal combustion engine.
    According to a variant, a smaller transfer pump is arranged to pump fuel Than one or more main tanks (large tanks) to a smaller tank, often called a transfer tank. In connection with the smaller tank, a main pump is arranged to then pump the fuel further from the smaller tank to the engine, via, for example, a high-pressure pump which is often arranged in connection with the engine.
    One reason for arranging a smaller tank, and to pump the industry via that tank, is that in large tanks, when grazing in hilly terrain, the industry can gather so that the industry luminaire (the rudder in the tank that sucks up the industry) can not suck up the industry onn there is relatively little fuel left in the tank.
    In connection with the fuel pump pairs, partly the main pump and partly the transfer pump, there are often fuel filters arranged downstream and the respective pump.
    By industry filter is meant a filter which comprises a water-separating layer or membrane with a water-repellent effect, ie. a membrane through which the smaller industry molecules can pass while the water molecules are stopped.
    The industry filter also has a particle collecting layer for the purpose of stopping particles in the industry.
    The water-separating layer, or nnennbranet, is gradually degraded, ie. the water-repellent effect accumulates, which results in more water molecules passing through the membrane.
    The filter separates water Iran industry. However, there may be some industry residues left in the water that are separated, which means that cla water is named in that context, some industry residues may remain.
    Water is present in the industry partly as "free water" which is easy to separate from the industry, and partly as an emulsion in the industry which is more likely to separate from the industry because the water is then more finely divided.
    In Europe and the USA, the industry contains very small amounts of water, in the order of 200 ppm, ie. 200 x -6 liters per liter of fuel. In countries with high humidity, the water content can be as high as 2-3%, ie. corresponding to 2000030000 ppm.
    The separated water is usually collected in a water tank adjacent to the filter, and holds in the order of 0.5 - 1.5 liters. Often the tank is placed under the filter and the separated water flows down into the tank due to gravity. The container is then emptied manually.
    The fuel is pumped with the fuel pump towards and through the fuel filter. The fuel pump has a controllable pump capacity, ie. the industry floclo may change depending on an electrical industry control signal. The fuel flow varies, of course, depending on how much fuel the engine requires and is normally in the range of 1 liter per minute.
    The invention relates partly to a method in a processing system and partly to the processing system itself. The method will first be described and then the processing system.
    With reference to the river diagram in Figure 1, the method can now be described. Reference is also made to the following description of the processing system and the industry system, and in particular to Figures 2 and 3.
    The invention relates to a method in a processing unit 2 for a fuel system 4 for an internal combustion engine 6. The fuel system 4 comprises a fuel tank system 8 with at least one main tank 9 intended for fuel, at least one fuel pump 10, 32 arranged in connection with the main tank 9, a control unit 12 adapted to control pumping of the fuel Iran fuel tank system 8 to the internal combustion engine 6 via a fuel line 13 by means of a control signal 14 to the fuel pump 10, 32.
    Furthermore, a fuel filter 16 is provided through which the pumped fuel is intended to pass, the fuel filter 16 comprises a water separating part intended to separate water from the fuel, and a feed unit 18 arranged in connection with the fuel filter 16, and that the processing unit 2 comprises a memory unit 24 and a analysis unit 26.
    The method comprises the steps of: passing through, with the wetland unit, wetlands of one or more parannets related to the separated water; - bestannnna nnatvarden for nannnda parannetrar; generating a food signal comprising said food host; receiving said food signal in the processing unit; storing said food value in the memory unit; analyzing said stored values in the analysis unit using a set of predetermined rules related to the function of the industry filter and / or the water content of the industry; generating an indication signal in dependent said analysis, the indication signal comprising information related to the function of the industry filter and / or the water content of the industry.
    The parameters may, for example, refer to a water level in a container intended for the separated water, or refer to a river for the separated water. The feeds can be fed continuously, or at a predetermined time interval between consecutive feeds. The time interval is in the order of a number of seconds up to a number of minutes.
    The food values are preferably stored together with times when the nights were spent. The analysis unit is adapted to determine, by applying the predetermined rules, how the food values change over time and to generate the said information for the indication signal in dependence on this change. The analysis unit 26 is thus adapted to analyze the stored food values using a set of predetermined rules related to the function of the industry filter and / or the water content of the industry and to generate an indication signal 28 depending on this analysis, where the indication signal 28 includes information related to the industry filter function and / or the water content of the industry. The information in the indication signal is the result of the analysis of the stored food values that the analysis unit 26 performs and thus contains information on the function of the industry filter and / or the water content of the industry. The information can consist of simple information which, for example, can refer to "change / do not change filter", or alternatively "good / bad industry"; or of more complex information showing changes in food values, for example together with true time information. The information in the indication signal thus makes it possible to interpret the stored food values with respect to the function of the industry filter and / or the water content of the industry.
    The indication signal 28 can, for example, be used in such a way that it means that information is presented to the driver which meant that appropriate measures must be taken, e.g. changing filters, emptying the water tank 30.
    The analysis unit 26 is preferably adapted to determine, using the predetermined rules, how said food value changes over time and to generate the information for the indication signal 28 in dependence on these changes. This can be determined partly by determining the speed at which the water level in the tank changes, or by a direct river supply. A measure of change can, for example, be determined by forming the derivative with respect to the time of a curve representing a number of consecutive food values. More specifically, this can be achieved by setting up the thresholds for the rate of change (the derivative) and if the rate of change exceeds these thresholds, an indication signal is generated with information representing this.
    According to one embodiment, the predetermined rules comprise comparing said food value with a first threshold value TR1, and if the food value is below said first threshold value, the analysis unit is adapted to generate the information for the indication signal indicating that the operation of the industry filter is not acceptable. In this case, it may be because the water separating function of the fuel filter has been collected and only a small part is separated by the filter.
    According to another embodiment, the analysis unit comprises a second threshold value TR2, exceeding said first threshold value TR1, and if said food value exceeds said second threshold value TR2, the analysis unit is adapted to generate information for the indication signal related to the industry water content, and especially indicating that the industry water content.
    Furthermore, the indication signal is preferably adapted to be supported by the control unit, the amount of pumped fuel by the fuel pump being adapted to be controlled by the control signal depending on the information related to the function of the fuel filter and / or the water content of the fuel.
    The processing unit will now be described with reference to the accompanying figures and with reference to the schematic block diagrams in Figures 2 and 3.
    The invention also relates to a processing unit 2 for a fuel system 4 for an internal combustion engine 6, wherein the fuel system 4 comprises a fuel tank system 8 with at least one main tank 9 (see figure 3) intended for fuel, at least one fuel pound 10 (see figure 3), 32 arranged in connection to the main tank 9. The fuel system 4 further comprises a control unit 12 adapted to control pumping of the fuel Than fuel tank system 8 to the internal combustion engine 6 via a fuel line 13 by means of a control signal 14 to the fuel pump 10, 32. At least one fuel filter 16 is provided through which the pumped fuel is intended To pass. The fuel filter 16 comprises a water separating part intended to separate water from the industry, and a feed unit 18 arranged in connection with the fuel filter 16 and intended to carry out feeds of one or more parameters related to the separated water 20. The feeds can be carried out continuously, or with a predetermined time interval. between consecutive feeds. The time interval is in the order of a number of seconds up to a number of minutes.
    The food unit 18 is further adapted to determine the food value in dependence on the feeds and to generate a food signal 22 comprising said food value. The fed parameter can for instance refer to a water level in a container 15 intended for the separated water 20 and the food unit can then consist of a simple float, or an inductive level net, which emits a food value depending on the water level in the container.
    According to another embodiment, the fed paranneter is the water flow and the feeding unit 18 is constituted by a river feeder which delivers a food value depending on the water flow for the separated water 20 to the container 30.
    The processing unit 2 comprises a memory unit 24 and an analysis unit 26, and the processing unit 2 is adapted to receive the food signal 22 and to store the food values in the memory unit 24.
    In the memory unit 24, the food values are preferably stored together at times when the feeds were carried out.
    In connection with the description of the method above, the calculations and analyzes that the analysis unit can carry out have been described in detail, and reference is made to that description. Figure 5 shows a graph schematically illustrating how the food values can be changed. The y-axis represents a measure of the flow of the separated water in water volume per unit time, and the X-axis represents the time. In the graph, two curves 40 and 42 (first and second curves, respectively) have been plotted, representing different cases. The curves have been drawn as solid lines but can also consist of feeding points where the feedings are carried out at separate times.
    The first curve 40 refers to a case where the flood gradually decreases, i.e. it can be suspected that the water-separating effect in the industry filter gradually evaporates and more and more water passes through the filter, which of course must be avoided. In that case, the analysis is performed by comparing the food values with a first threshold value TR1, and if the food value is below said first threshold value, the analysis unit 26 is adapted to generate information for the indication signal 28 indicating that the operation of the industry filter 16 is not acceptable. This takes place at time t1. Of course, there is also a possibility that the industry actually contains very little water, which further tests may show.
    The second curve 42 refers to a case where the flood increases. In that case, it may be suspected that the industry contains an excessively high water content, and the analysis unit 26 is then adapted to generate information for the indication signal 28 related to the water content of the industry. If the analysis unit 26 has a second threshold value TR2, exceeding said first threshold value TR1, and if the food value exceeds this second threshold value TR2, the analysis unit 26 is adapted to generate information for the indication signal 28 which indicates that the industry's water content may be unacceptably high. In the graph, this takes place at time t2. The second threshold value has been assigned a value corresponding to a level as the water content in the industry is higher than an acceptable level.
    Figure 3 shows a block diagram of a type of fuel system where the fuel tank system 8 comprises two main tanks 9. These are connected to each other so that fuel can flow from the main tank in the figure to the left of the left main tank. A transfer pump 32 is arranged to pump fuel from the main tank 9 to a transfer tank 31, which is considerably smaller than the main tanks. In the transfer tank 31, the fuel pump 10 is arranged. Both the transfer pump 32 and the fuel pump 10 are controlled by control signals 14 Than the control unit 12. It should be noted that the transfer pump 32 may alternatively be arranged in the main tank 9, and that the fuel pump 10 may alternatively be arranged outside the transfer tank 31. There is also a return line 34 between the transfer tank 31 and one of the main tanks 9. If the transfer tank 31 becomes full, fuel can be returned via the return line 34 to the main tank 9.
    The fuel filter 16 is arranged downstream of the transfer pump 32.
    If it turns out that the industry has a high water content, it may be advantageous to lower the pressure on the industry which is to pass through the industry filter, in order thereby increasing the filter's ability to separate the water from the industry. To achieve this, the indication signal 28 is adapted to be powered by the control unit 12, the amount of pumped fuel by the fuel pump 10, 32, and especially the transfer pump 32, being adapted to be controlled by said control signal 14 depending on the information related to the fuel filter 16 and / or industry water slippery. Preferably, the amount of pounded fuel is reduced if the water content increases.
    For example, one can deliberately fill up the transfer tank 31 to force the branch back to the main tank 9 via the return line 34 and thereby filter the branch once more.
    Figure 4 shows a schematic and simplified view of a vehicle 36 comprising an internal combustion engine 6, an internal combustion engine fuel system, the fuel system comprising a fuel tank system 8 with a main fuel tank, at least one fuel pump 10, 32 arranged adjacent to the main tank and a control unit 12 adapted to control the pumping of fuel 13 from the fuel tank system to the internal combustion engine. Furthermore, a processing unit 2 is provided, which operates as described above, and which is adapted, inter alia, to receive a food signal 22 Than the industry filter 16 which contains 12 nanvards related to the separated water 20 and to generate an indication signal 28.
    The invention further comprises a computer program in vehicles, wherein said computer program comprises program code for causing processing unit, or a computer connected to the processing unit, to perform the steps according to the method described above.
    The present invention is not limited to the above-described preferred embodiments. Different alternatives, modifications and equivalents can be used.
    The above embodiments are, therefore, not to be construed as limiting the scope of the invention as defined by the appended claims.
    权利要求:
    Claims (19)
    [1]
    Perform, with the feed unit, feedings of one or more parameters related to the separated water; 2. determine the food value for said parameters; 3. generating a food signal comprising said food host; 4. take another ninth food signal in the processing unit; 5. store said food value in the memory unit; - analyzing said stored values in the analysis unit using a set of predetermined rules related to the function of the industry filter and / or the water content of the industry; Generating an indication signal in dependent said analysis, wherein the indication signal comprises information related to the function of the industry filter and / or the water content of the industry.
    [2]
    The method of claim 1, wherein said food value is stored along with times when the feeds were passed.
    [3]
    The method of claim 1 or 2, wherein said predetermined rules comprise determining how said food value changes over time and generating said information for the indication signal in dependence on said change.
    [4]
    The method of any of claims 1-3, wherein said predetermined rules comprise comparing said food value with a first threshold value TR1, and if the food value is below said first threshold value generating the information for the indication signal indicating that the operation of the industry filter is not acceptable.
    [5]
    The method of any of claims 1-4, wherein the method comprises generating the information for the indication signal related to the water content of the industry.
    [6]
    The method according to any one of claims 1-5, wherein the method comprises generating the information for the indication signal related to the water content of the industry if said food value exceeds a second threshold value TR2, exceeding a first threshold value TR1.
    [7]
    The method according to any one of claims 1-6, wherein the amount of pumped fuel by the fuel pump is adapted to be controlled below said control signal in dependence on the information related to the function of the fuel filter and / or the water content of the fuel.
    [8]
    The method according to any one of claims 1-7, wherein said parameter refers to at least one water level in a container intended for the separated water.
    [9]
    The method according to any one of claims 1-8, wherein said parameter refers to a flood for the separated water.
    [10]
    A processing unit (2) for a fuel system (4) for an internal combustion engine (6), wherein the fuel system (4) comprises a fuel tank system (8) with at least one main tank (9) intended for fuel, at least one fuel pump (10, 32) arranged in connection with the main tank (9), a control unit (12) adapted to control pumping of the fuel from the fuel tank system (8) to the internal combustion engine (6) via a fuel line (13) by means of a control signal (14) to said fuel pound (10, 32) , and a fuel filter (16) through which the pumped fuel is intended to pass, the fuel filter (16) comprises a water separating part intended to separate water from the fuel, and a feed unit (18) arranged in connection with the fuel filter (16) and intended to carry out feeding of one or more parameters related to the separated water (20), determining the food value for said one or more parameters and generating a food signal (22) comprising said food value, may be a sign of processing the processing unit (2) comprises a memory unit (24) and an analysis unit (26), and that the processing unit (2) is adapted to receive said input signal (22) and to store said food value in the memory unit (24), the analysis unit (26) being adapted to analyze said stored food value using a set of predetermined rules related to the function of the industry filter and / or the water content of the industry and to generate an indication signal (28) in dependent analysis, where the indication signal (28) includes information related to the industry filter function and / or industry water content.
    [11]
    The processing unit (2) according to claim 10, wherein said data is stored together with times when the feeds were passed through.
    [12]
    The processing unit (2) according to claim 11 or 12, wherein said predetermined rules comprise determining how said food value changes over time and that the analysis unit (26) is adapted to generate said information in the indication signal (28) depending on said change.
    [13]
    The processing unit (2) according to any one of claims 10-12, wherein said predetermined rules comprise comparing said food value with a first threshold value TR1, and if the food value is below said first threshold value, the analysis unit (26) is adapted to generate the information for the indication signal ( 28) indicating that the function of the industry filter (16) is not acceptable. 16
    [14]
    The processing unit (2) according to any one of claims 10-13, wherein said analysis unit (26) is adapted to generate information for the indication signal (28) related to the water content of the industry.
    [15]
    The processing unit (2) according to any one of claims 10-14, wherein the analysis unit (26) has a second threshold value TR2, exceeding said first threshold value TR1, and if said food value exceeds said second threshold value TR2, the analysis unit (26) is adapted to generate information for the indication signal (28) related to the water content of the industry.
    [16]
    The processing unit (2) according to any one of claims 10-15, wherein said indicating signal (28) is adapted to be applied to said control unit (12), the amount of pumped fuel by the fuel pump (10) being adapted to be controlled by said control signal (14) in dependent of the information related to the function of the industry filter (16) and / or the water content of the industry.
    [17]
    The processing unit according to any one of claims 10-16, wherein said parameter relates to at least one water level in a container (30) intended for the separated water (20).
    [18]
    The processing unit according to any one of claims 10-17, wherein said parameter relates to a -Nide for the separated water (20).
    [19]
    A computer program comprising program code for causing a processing unit, or a computer connected to the processing unit, to perform the steps of the method according to any one of claims 1-9.
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    同族专利:
    公开号 | 公开日
    WO2015030662A1|2015-03-05|
    BR112016002249A2|2017-08-01|
    SE538892C2|2017-01-31|
    DE112014003464T5|2016-04-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE19847999A1|1998-10-17|2000-04-20|Mann & Hummel Filter|Diesel fuel filter with automatic water disposal is used to pump under pressure dewater fuel to main filter|
    IT1311043B1|1999-11-03|2002-02-28|Ufi Universal Filter Int Spa|GROUP FOR THE AUTOMATIC PURIFICATION OF SEPARATE WATER IN A VEHICLE FUEL FILTER, IN PARTICULAR FOR DIESEL ENGINES.|
    US6676841B2|2001-11-06|2004-01-13|Cummins Inc.|Water-in-fuel abuse detection|
    DE202006001950U1|2006-02-06|2007-06-06|Hengst Gmbh & Co.Kg|Fluid filter, with protected liquid sensor|
    US7453271B2|2006-12-21|2008-11-18|Gm Global Technology Operations, Inc.|Apparatus and method for sensing water within a fuel-water separator assembly|
    DE102007059051A1|2007-12-06|2009-06-10|Mann + Hummel Gmbh|Device and method for operating a fuel filter|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1351002A|SE538892C2|2013-08-30|2013-08-30|A method of a processing unit in connection with water separation in a fuel filter, and said processing unit|SE1351002A| SE538892C2|2013-08-30|2013-08-30|A method of a processing unit in connection with water separation in a fuel filter, and said processing unit|
    BR112016002249A| BR112016002249A2|2013-08-30|2014-08-27|method for a processing device in association with water separation in a fuel filter, and said processing device|
    DE112014003464.9T| DE112014003464T5|2013-08-30|2014-08-27|Process for a processing device in connection with water separation in a fuel filter, and processing device|
    PCT/SE2014/050984| WO2015030662A1|2013-08-30|2014-08-27|A method for a processing device in connection with water separation in a fuel filter, and said processing device|
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