WO2015030662A1 - A method for a processing device in connection with water separation in a fuel filter, and said processing device - Google Patents

A method for a processing device in connection with water separation in a fuel filter, and said processing device Download PDF

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Publication number
WO2015030662A1
WO2015030662A1 PCT/SE2014/050984 SE2014050984W WO2015030662A1 WO 2015030662 A1 WO2015030662 A1 WO 2015030662A1 SE 2014050984 W SE2014050984 W SE 2014050984W WO 2015030662 A1 WO2015030662 A1 WO 2015030662A1
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WO
WIPO (PCT)
Prior art keywords
fuel
measuring
processing device
water
indication signal
Prior art date
Application number
PCT/SE2014/050984
Other languages
French (fr)
Inventor
Dan CEDFORS
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
Priority to DE112014003464.9T priority Critical patent/DE112014003464T5/en
Priority to BR112016002249A priority patent/BR112016002249A2/en
Publication of WO2015030662A1 publication Critical patent/WO2015030662A1/en

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Classifications

    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/24—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/143—Filter condition indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/143—Filter condition indicators
    • B01D35/1435—Filter condition indicators with alarm means
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/24—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means
    • F02M37/26—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means with water detection means
    • F02M37/28—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by water separating means with water detection means with means activated by the presence of water, e.g. alarms or means for automatic drainage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/003—Filters in combination with devices for the removal of liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/003—Filters in combination with devices for the removal of liquids
    • B01D36/005—Liquid level sensing means, e.g. for water in gasoil-filters
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements

Definitions

  • a method for a processing device in connection with water separation in a fuel filter, and said processing device is provided.
  • the present invention pertains to a method in connection with a processing device, and the processing device, according to the preambles of the independent patent claims.
  • the processing device and the method according to the invention are specifically adapted to be applied in connection with vehicles, e.g. trucks and buses, but may also be used in other applications where combustion engines are used, e.g. on board ships and in industry. Background of the invention
  • Combustion engines burn an air/fuel mixture in several cylinders, in order to operate pistons that generate a driving torque. Air is sucked into a suction pipe through an inlet and fuel is then injected into the suction pipe or directly into the cylinders (direct injection) in order to create the air/fuei mixture.
  • a fuei system is used to adapt the fuel flow which is injected in order to obtain a desired air/fuel mixture for the cylinders.
  • the fuel system often contains one or several fuel tanks, fuel pumps, fuel filters and fuel injection devices.
  • a low pressure fuei pump may extract the fuel from a fuel tank, pressurise the fuel and supply fuel with low pressure to an injection device or a high pressure fuel pump.
  • a high pressure fuel pump increases the pressure further and forwards the fuel to one or several injection devices.
  • WO-201 2/023638 pertains to a device to protect an engine against inflow of fuel with too high a water content, by reducing the engine speed for the engine if water content in the fuel is detected. More specifically, the device comprises a sensor to detect the water content in the fuel. The sensor generates a detection signal depending on the measurements and a control signal is generated to reduce the engine speed, depending on the detection signal. Further, the driver may get an indication if the water separation does not function as intended. Since the requirements are increasing both in relation to long service intervals of fuel filters and high efficiency of water separation, both these requirements may not always be fulfilled, it is common today to drive until the fuel filter is clogged, at which point the wafer separation has long been at an unacceptable level due to the degradation of the filter. This entails driving with aqueous fuel in the injection system, with incipient damage as a consequence.
  • the objective of the present invention is to improve the current fuel system by obtaining an earlier indication of the fuel filter's function, and also obtaining an indication of the fuel's water content.
  • the present invention is preferably applicable in a fuel system of a type that may be titled a controllable low pressure system, wherein the pumping of fuel is controlled independently of the engine.
  • the present invention improves the possibility of detecting and diagnosing an impaired water separation from the fuel in the fuel filter.
  • Another advantage of the invention is that it provides a possibility of early discovery if the fuel has an unacceptably high water content.
  • the invention allows the system to optimise itself more adaptiveiy with respect to the water separation, by reducing the
  • Figure 1 is a flow chart which schematically shows the method according to the present invention.
  • Figure 2 is a block diagram which schematically illustrates the present invention.
  • Figure 3 is a block diagram which schematically illustrates one embodiment of the present invention.
  • Figure 4 is a schematic image of a vehicle, where the present invention has been implemented.
  • FIG. 5 is a graph which illustrates aspects of the present invention. Detailed description of preferred embodiments of the invention.
  • the fuel pump is arranged in connection with the engine and sucks up the fuel.
  • the fuel pump is mechanically connected to the engine and operated by the engine's driving shaft, in another type of fuel system for combustion engines, the fuel pump instead is arranged in connection with the main tank and pressurises the fuel via fuel pipes to the engine, in this type of fuel system, the fuel pump is often electrically, pneumatically or hydraulica!!y driven, and is operated independently of the combustion engine's driving shaft.
  • the present invention is particularly applicable to this second type of fuel system, i.e. where the fuel pump is arranged in connection with the main tank and pushes the fuel to the engine.
  • the fuel pump is e.g. electrically, pneumatically or hydrauiicaily operated, independently of the combustion engine's driving shaft.
  • a smaller transfer pump arranged to pump fuel from one or several 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 subsequently pump along the fuel from the smaller tank to the engine, via e.g. a high pressure pump which is often arranged in connection with the engine.
  • a main pump is arranged to subsequently pump along the fuel from the smaller tank to the engine, via e.g. a high pressure pump which is often arranged in connection with the engine.
  • a fuel filter is often arranged downstream of each pump.
  • a fuel filter means a filter which comprises a water-separating layer or a membrane with a water-repeiling effect, i.e. a membrane through which the smaller fuel molecules may pass, while the water molecules are stopped.
  • the fuel filter also has a particle-collecting layer, with the objective of stopping particles in the fuel.
  • the water-separating layer or membrane gradually degrades, i.e. the water- repelling effect is impaired, with the consequence that more and more water molecules pass through the membrane.
  • water is separated from the fuel.
  • there may be certain fuel residues remaining in the water that is separated meaning that where water is mentioned in this context, some fuel residues may remain.
  • fuel contains very small amounts of water, in the range of 200 ppm, i.e. 200 x 1 Q -D litres per litre of fuel, in countries with high air humidity, the water content may be as high as 2-3%, i.e. representing 20,000-30,000 ppm.
  • the separated water is usually collected in a water container in connection with the filter, and contains in the range of 0.5-1 .5 litres. Often the container is placed below the filter and the separated water trickles down into the container thanks to gravitation. 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, i.e. the fuel flow may be altered
  • the invention pertains partly to a method in a processing system, and partly to the processing system itself.
  • the invention pertains to a method in a processing device 2 for a fuel system 4 for a combustion engine 6.
  • the fuel system 4 comprises a fuel tank system 8 with at least one main pump 9 intended for fuel, at least one fuel pump 10, 32 arranged in connection with the main tank 9, a control device 1 2 adapted to control pumping of the fuei from the fuei tank system 8 to the combustion engine 6, via a fuei pipe 1 3, by the means of a control signal 14 to the fuei pump 1 0, 32.
  • a fuei filter 1 6 is arranged, through which the pumped fuei is intended to pass, the fuei filter 1 6 comprising a water-separating part designed to separate water from the fuei, and a measuring device 1 8 arranged in connection with the fuei filter 1 6, and the processing device 2 further comprises a memory device 24 and an analysis device 26.
  • the method comprises the following steps:
  • the indication signal comprises information related to the fuei filter's function and/or the fuel's water content.
  • the parameters may e.g. relate to a water level in a container intended for the separated water, or to a flow for the separated water. Measurements may be carried out continuously, or with a predetermined time interval between
  • the time interval is in the range of a number of seconds up to a number of minutes.
  • the measuring values are preferably stored jointly with the points in time when the measurements were carried out.
  • the analysis device is adapted to determine, by applying the predetermined rules, how the measuring values change over time and to generate said information for the indication signal, depending on such change.
  • the analysis device 26 is thus adapted to analyse the stored measuring values, using a set of predetermined rules related to the fuel filter's water-separating function and/or the fuel's water content, and to generate an indication signal 28 depending on such analysis, wherein the indication signal 28 comprises information related to the fuel filter's function and/or the fuel's water content.
  • the information in the indication signal is the result of the analysis of the stored measuring values, carried out by the analysis device 26, and thus containing information about the fuel filter's function and/or the fuel's water content.
  • the information may consist of simple information regarding for instance "change/do not change filter", or "good/poor fuel”; or more complex information, which shows changes in the measuring values, e.g. jointly with associated time information.
  • the information in the indication signal thus makes it possible to interpret the stored measuring values relating to the fuel filter's function and/or the fuel's water content.
  • the indication signal 28 may e.g. be used in such a way that information is presented to the driver, entailing that suitable measures must be taken, e.g.
  • the analysis device 28 is preferably adapted to determine, using the
  • predetermined rules how said measuring values change over time and to generate information for the indication signal 28, depending on such changes. This may be determined either by determining the speed at which the liquid level in the container is changing, or by a direct flow measurement.
  • One measure of the change may e.g. be determined by creating the time derivative for a curve representing a number of consecutive measuring values. More specifically, this may be achieved by setting up threshold values for the rate of change (the derivative), and if the rate of change exceeds these threshold values, an indication signal with information representing this is generated.
  • the predetermined rules comprise comparing said measuring value with a first threshold value TR1 , and if the measuring value is below said first threshold value, the analysis device is adapted to generate information for the indication signal, indicating that the fuel filter's function is not acceptable, in this case, this may be due to the fact that the fuel filter's water- separating function has deteriorated and only a small fraction is separated by the filter.
  • the analysis device comprises a second threshold value TR2, exceeding said first threshold value TR1 , and if said measuring values exceed said second threshold value TR2, the analysis device is adapted to generate information for the indication signal related to the fuel's water content, and especially indicating that the fuel's water content is too high.
  • the indication signal is preferably adapted to be applied to the control device, so that the amount of fuel pumped by the fuel pump is adapted to be controlled with the control signal, depending on information related to the fuel filter's function and/or the fuel's water content.
  • the invention also pertains to a processing device 2 for a fuel system 4 for a combustion engine 8, 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 pump 1 0 (see Figure 3), 32 being arranged in connection with the main tank 9.
  • the fuel system 4 also comprises a control device 1 2 adapted to control the pumping of fuel from the fuel tank system 8 to the combustion engine 6 via a fuel pipe 1 3, by the means of a control signal 14 to the fuel pump 1 0, 32, At least one fuel filter 1 8 is arranged, through which the pumped fuel is intended to pass.
  • the fuel filter 1 6 comprises a water-separating part, intended to separate water from the fuel, and a measuring device 1 8 arranged in connection with the fuel filter 16 and intended to carry out measurements of one or several parameters related to the separated water 20. Measurements may be carried out continuously, or with a predetermined time interval between consecutive measurements. The time interval is in the range of a number of seconds up to a number of minutes.
  • the measuring device 1 8 is also adapted to determine measuring values depending on the measurements, and to generate a measuring signal 22 comprising said measuring value.
  • the measured parameter may e.g. relate to a water level in a container 30 intended for the separated water 20, and the measuring device may in this case consist of a simple floater, or an inductive level sensor, emitting a measuring value depending on the water level in the container.
  • the measured parameter is the water flow
  • the measuring device 1 8 consists of a flow sensor, emitting a measuring value depending on the wafer flow for the separated water 20 to the container 30.
  • the processing device 2 comprises a memory device 24 and an analysis device 26, and the processing device 2 is adapted to receive the measuring signal 22, and to store the measuring values in the memory device 24.
  • the measuring values are preferably stored jointly with the points in time when the measurements were carried out.
  • Figure 5 shows a graph which schematically illustrates how the measuring values may change.
  • the Y-axis represents a measure of the separated water's flow in water volume per time unit
  • the X-axis represents the time, in the graph
  • two curves 40 and 42 (the first and second curve, respectively) have been drawn representing different cases.
  • the curves have been drawn here as solid lines, but may also consist of measuring points where the measurements are carried out at separate points in time.
  • the first curve 40 pertains to a case where the flow gradually decreases, i.e. there is reason to suspect that the water-separating effect in the fuel filter is gradually impaired and that more and more water passes through the filter, which must obviously be avoided, in this case, the analysis is carried out by comparing the measuring values with a first threshold value TR1 , and if the measuring value is below said first threshold value, the analysis device 26 is adapted to generate information for the indication signal 28, indicating that the fuel filter's 18 function is not acceptable. This occurs at the point in time t1 . There is of course also a possibility that the fuel actually contains very little water, as may be determined by further tests.
  • the second curve 42 pertains to a case where the flow increases.
  • the analysis device 26 is adapted to generate information for the indication signal 28, related to the fuel's water content.
  • the analysis device 26 has a second threshold value TR2, exceeding said first threshold value TR1 , and if the measuring value exceeds this second threshold value TR2, the analysis device 28 is adapted to generate information for the indication signal 28, indicating that the water content in the fuel may be unacceptably high. In the graph, this occurs at the point in time t2.
  • the second threshold value has been allocated a value representing a level, where the water content in the fuel is higher than an acceptable level.
  • FIG. 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 with each other, that fuel may flow from the right main tank to the left main tank in the figure.
  • a transfer pump 32 is arranged to pump fuel from the main tank 9 to a transfer tank 31 , which is significantly smaller than the main tanks.
  • the fuel pump 1 0 is arranged in the transfer tank 31 .
  • Both the transfer pump 32 and the fuel pump 10 are controlled by control signals 14 from the control device 1 2.
  • the transfer pump 32 may also be arranged in the main tank 9, and that the fuel pump 1 0 may be arranged outside the transfer tank 31 .
  • the fuel filter 18 is here arranged downstream of the transfer pump 32.
  • the indication signal 28 is adapted to be applied to the control device 1 2, so that the amount of fuel pumped by the fuel pump 1 0, 32, and especially the transfer pump 32, is adapted to be controlled with said control signal 14, depending on the information related to the fuel filter's 16 function and/or the fuel's water content, the information of which is applied to the control device 1 2 by means of the indication signal 28.
  • the amount of fuel pumped is reduced if the water content increases.
  • the transfer tank 31 may intentionally be filled up in order to force the fuel back to the main tank 9 via the return pipe 34, and thus to filter the fuel one more time.
  • Figure 4 shows a schematic and simplified image of a vehicle 36 comprising a combustion engine 8, a fuel system for the combustion engine, where the fuel system comprises a fuel tank system 8 with a main tank intended for fuel, at least one fuel pump 1 0, 32 arranged in connection with the main tank and a control device 1 2 adapted to control the pumping of fuel 1 3 from the fuel tank system to the combustion engine.
  • a processing device 2 is arranged, functioning according to the above description, and which e.g. is adapted to receive a measuring signal 22 from the fuel filter 1 8, containing measuring values related to the separated water 20, and to generate an indication signal 28.
  • the invention also comprises a computer program in vehicles, wherein said computer program comprises program code to cause a processing unit, or a computer connected to a processing unit, to carry out the steps according to the method described above.
  • the invention also comprises a combustion engine and a vehicle, which comprise the processing device as described above.

Abstract

A method in a processing device (2) for a fuel system (4) for a 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) comprising a water-separating part designed to separate water from the fuel, and a measuring device (18) arranged in connection with the fuel filter (16); and wherein the processing device (2) comprises a memory device (24) and an analysis device (26). The method comprises the following steps: - to carry out, with the measuring device, measurements of one or several parameters related to the separated water; - to determine measuring values for said parameters; - to generate a measuring signal comprising said measuring values; - to receive said measuring signal in the processing device; - to store said measuring values in the memory device; - to analyse said stored measuring values in the analysis device, using a set of predetermined rules related to the fuel filter's function and/or the fuel's water content; - to generate an indication signal depending on said analysis, wherein the indication signal comprises information related to the fuel filter's function and/or the fuel's water content,

Description

Title
A method for a processing device in connection with water separation in a fuel filter, and said processing device.
Field of the invention
The present invention pertains to a method in connection with a processing device, and the processing device, according to the preambles of the independent patent claims.
The processing device and the method according to the invention are specifically adapted to be applied in connection with vehicles, e.g. trucks and buses, but may also be used in other applications where combustion engines are used, e.g. on board ships and in industry. Background of the invention
Combustion engines burn an air/fuel mixture in several cylinders, in order to operate pistons that generate a driving torque. Air is sucked into a suction pipe through an inlet and fuel is then injected into the suction pipe or directly into the cylinders (direct injection) in order to create the air/fuei mixture. A fuei system is used to adapt the fuel flow which is injected in order to obtain a desired air/fuel mixture for the cylinders.
The fuel system often contains one or several fuel tanks, fuel pumps, fuel filters and fuel injection devices. For example, a low pressure fuei pump may extract the fuel from a fuel tank, pressurise the fuel and supply fuel with low pressure to an injection device or a high pressure fuel pump.
A high pressure fuel pump increases the pressure further and forwards the fuel to one or several injection devices.
With today's high pressures and sensitive tolerance bands in injection systems, water separation is a requirement in the fuel system's iow pressure circuit in connection with filtration. One example of a fuel system with a fuel filter is described in the following document.
WO-201 2/023638 pertains to a device to protect an engine against inflow of fuel with too high a water content, by reducing the engine speed for the engine if water content in the fuel is detected. More specifically, the device comprises a sensor to detect the water content in the fuel. The sensor generates a detection signal depending on the measurements and a control signal is generated to reduce the engine speed, depending on the detection signal. Further, the driver may get an indication if the water separation does not function as intended. Since the requirements are increasing both in relation to long service intervals of fuel filters and high efficiency of water separation, both these requirements may not always be fulfilled, it is common today to drive until the fuel filter is clogged, at which point the wafer separation has long been at an unacceptable level due to the degradation of the filter. This entails driving with aqueous fuel in the injection system, with incipient damage as a consequence.
The objective of the present invention is to improve the current fuel system by obtaining an earlier indication of the fuel filter's function, and also obtaining an indication of the fuel's water content.
Summary of the invention
The objectives mentioned above are achieved with the invention as defined by the independent claims. The preferred embodiments are defined by the dependent claims.
The present invention is preferably applicable in a fuel system of a type that may be titled a controllable low pressure system, wherein the pumping of fuel is controlled independently of the engine. The present invention improves the possibility of detecting and diagnosing an impaired water separation from the fuel in the fuel filter. Another advantage of the invention is that it provides a possibility of early discovery if the fuel has an unacceptably high water content.
According to one embodiment, the invention allows the system to optimise itself more adaptiveiy with respect to the water separation, by reducing the
flow/pressure of the fuel pump, so that the water is separated over time. Brief description of drawings
Figure 1 is a flow chart which schematically shows the method according to the present invention.
Figure 2 is a block diagram which schematically illustrates the present invention. Figure 3 is a block diagram which schematically illustrates one embodiment of the present invention.
Figure 4 is a schematic image of a vehicle, where the present invention has been implemented.
Figure 5 is a graph which illustrates aspects of the present invention. Detailed description of preferred embodiments of the invention
In the figures, details with the same or similar functions and design have consistently received the same reference numerals.
Herein, initially a general description of a fuel system wherein the invention is applicable is given, followed by a more detailed description of the preferred embodiments of the invention with reference to the enclosed drawings.
In many vehicles today, the fuel pump is arranged in connection with the engine and sucks up the fuel. Often, the fuel pump is mechanically connected to the engine and operated by the engine's driving shaft, in another type of fuel system for combustion engines, the fuel pump instead is arranged in connection with the main tank and pressurises the fuel via fuel pipes to the engine, in this type of fuel system, the fuel pump is often electrically, pneumatically or hydraulica!!y driven, and is operated independently of the combustion engine's driving shaft.
The present invention is particularly applicable to this second type of fuel system, i.e. where the fuel pump is arranged in connection with the main tank and pushes the fuel to the engine. The fuel pump is e.g. electrically, pneumatically or hydrauiicaily operated, independently of the combustion engine's driving shaft.
According to one variant, there is a smaller transfer pump arranged to pump fuel from one or several 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 subsequently pump along the fuel from the smaller tank to the engine, via e.g. a high pressure pump which is often arranged in connection with the engine. One reason for arranging a smaller tank, and for pumping the fuel via this tank, is that the fuel may gather in large tanks when driving in hilly terrain,, so that the fue armature (the pipe that sucks up the fuel in the tank) may not be able to suck up the fuel if there is relatively little fuel left in the tank. In connection with the fuel pumps, both the main pump and partly the transfer pump, a fuel filter is often arranged downstream of each pump.
A fuel filter means a filter which comprises a water-separating layer or a membrane with a water-repeiling effect, i.e. a membrane through which the smaller fuel molecules may pass, while the water molecules are stopped.
The fuel filter also has a particle-collecting layer, with the objective of stopping particles in the fuel. The water-separating layer or membrane gradually degrades, i.e. the water- repelling effect is impaired, with the consequence that more and more water molecules pass through the membrane. In the filter, water is separated from the fuel. However, there may be certain fuel residues remaining in the water that is separated, meaning that where water is mentioned in this context, some fuel residues may remain.
Water exists in the fuel partly as "free water", which is easily separated from the fuel, and partly as an emulsion in the fuel, which is harder to separate from the fuel, since the water is then more comminuted.
In Europe and the USA, fuel contains very small amounts of water, in the range of 200 ppm, i.e. 200 x 1 Q-D litres per litre of fuel, in countries with high air humidity, the water content may be as high as 2-3%, i.e. representing 20,000-30,000 ppm.
The separated water is usually collected in a water container in connection with the filter, and contains in the range of 0.5-1 .5 litres. Often the container is placed below the filter and the separated water trickles down into the container thanks to gravitation. 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, i.e. the fuel flow may be altered
depending on an electrical fuel control signal. The fuel flow naturally varies depending on how much fuel the engine requires, and is normally within the range 1 -5 litres per minute.
The invention pertains partly to a method in a processing system, and partly to the processing system itself.
The method will be described first, and subsequently the processing system will be described.
With reference to the flow chart in Fig. 1 , the method will now be described.
Reference is also made to the subsequent description of the processing system and the fuel system, and in particular to Figures 2 and 3. The invention pertains to a method in a processing device 2 for a fuel system 4 for a combustion engine 6. The fuel system 4 comprises a fuel tank system 8 with at least one main pump 9 intended for fuel, at least one fuel pump 10, 32 arranged in connection with the main tank 9, a control device 1 2 adapted to control pumping of the fuei from the fuei tank system 8 to the combustion engine 6, via a fuei pipe 1 3, by the means of a control signal 14 to the fuei pump 1 0, 32. Further, a fuei filter 1 6 is arranged, through which the pumped fuei is intended to pass, the fuei filter 1 6 comprising a water-separating part designed to separate water from the fuei, and a measuring device 1 8 arranged in connection with the fuei filter 1 6, and the processing device 2 further comprises a memory device 24 and an analysis device 26.
The method comprises the following steps:
- to carry out, with the measuring device, measurements of one or several parameters related to the separated water;
- to determine measuring values for said parameters;
- to generate a measuring signal comprising said measuring values;
- to receive said measuring signal in the processing device;
- to store said measuring values in the memory device;
- to analyse said stored measuring values in the analysis device, using a set of predetermined rules related to the fuel filter's function and/or the fuel's water content;
- to generate an indication signal depending on said analysis, wherein the indication signal comprises information related to the fuei filter's function and/or the fuel's water content.
The parameters may e.g. relate to a water level in a container intended for the separated water, or to a flow for the separated water. Measurements may be carried out continuously, or with a predetermined time interval between
consecutive measurements. The time interval is in the range of a number of seconds up to a number of minutes. The measuring values are preferably stored jointly with the points in time when the measurements were carried out. The analysis device is adapted to determine, by applying the predetermined rules, how the measuring values change over time and to generate said information for the indication signal, depending on such change.
The analysis device 26 is thus adapted to analyse the stored measuring values, using a set of predetermined rules related to the fuel filter's water-separating function and/or the fuel's water content, and to generate an indication signal 28 depending on such analysis, wherein the indication signal 28 comprises information related to the fuel filter's function and/or the fuel's water content. The information in the indication signal is the result of the analysis of the stored measuring values, carried out by the analysis device 26, and thus containing information about the fuel filter's function and/or the fuel's water content. The information may consist of simple information regarding for instance "change/do not change filter", or "good/poor fuel"; or more complex information, which shows changes in the measuring values, e.g. jointly with associated time information. The information in the indication signal thus makes it possible to interpret the stored measuring values relating to the fuel filter's function and/or the fuel's water content.
The indication signal 28 may e.g. be used in such a way that information is presented to the driver, entailing that suitable measures must be taken, e.g.
replacement of filter, emptylng of the water container 30.
The analysis device 28 is preferably adapted to determine, using the
predetermined rules, how said measuring values change over time and to generate information for the indication signal 28, depending on such changes. This may be determined either by determining the speed at which the liquid level in the container is changing, or by a direct flow measurement. One measure of the change may e.g. be determined by creating the time derivative for a curve representing a number of consecutive measuring values. More specifically, this may be achieved by setting up threshold values for the rate of change (the derivative), and if the rate of change exceeds these threshold values, an indication signal with information representing this is generated. According to one embodiment, the predetermined rules comprise comparing said measuring value with a first threshold value TR1 , and if the measuring value is below said first threshold value, the analysis device is adapted to generate information for the indication signal, indicating that the fuel filter's function is not acceptable, in this case, this may be due to the fact that the fuel filter's water- separating function has deteriorated and only a small fraction is separated by the filter.
According to another embodiment, the analysis device comprises a second threshold value TR2, exceeding said first threshold value TR1 , and if said measuring values exceed said second threshold value TR2, the analysis device is adapted to generate information for the indication signal related to the fuel's water content, and especially indicating that the fuel's water content is too high.
Further, the indication signal is preferably adapted to be applied to the control device, so that the amount of fuel pumped by the fuel pump is adapted to be controlled with the control signal, depending on information related to the fuel filter's function and/or the fuel's water content.
The processing device will now be described with reference to the enclosed figures and with reference to the schematic block diagrams in Figures 2 and 3.
The invention also pertains to a processing device 2 for a fuel system 4 for a combustion engine 8, 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 pump 1 0 (see Figure 3), 32 being arranged in connection with the main tank 9. The fuel system 4 also comprises a control device 1 2 adapted to control the pumping of fuel from the fuel tank system 8 to the combustion engine 6 via a fuel pipe 1 3, by the means of a control signal 14 to the fuel pump 1 0, 32, At least one fuel filter 1 8 is arranged, through which the pumped fuel is intended to pass. The fuel filter 1 6 comprises a water-separating part, intended to separate water from the fuel, and a measuring device 1 8 arranged in connection with the fuel filter 16 and intended to carry out measurements of one or several parameters related to the separated water 20. Measurements may be carried out continuously, or with a predetermined time interval between consecutive measurements. The time interval is in the range of a number of seconds up to a number of minutes.
The measuring device 1 8 is also adapted to determine measuring values depending on the measurements, and to generate a measuring signal 22 comprising said measuring value.
The measured parameter may e.g. relate to a water level in a container 30 intended for the separated water 20, and the measuring device may in this case consist of a simple floater, or an inductive level sensor, emitting a measuring value depending on the water level in the container.
According to another embodiment, the measured parameter is the water flow, and the measuring device 1 8 consists of a flow sensor, emitting a measuring value depending on the wafer flow for the separated water 20 to the container 30. The processing device 2 comprises a memory device 24 and an analysis device 26, and the processing device 2 is adapted to receive the measuring signal 22, and to store the measuring values in the memory device 24.
In the memory device 24, the measuring values are preferably stored jointly with the points in time when the measurements were carried out.
In connection with the description of the above method, the calculations and analyses that the analysis device may carry out have been described in detail, and herein reference is made to this description.
Figure 5 shows a graph which schematically illustrates how the measuring values may change. The Y-axis represents a measure of the separated water's flow in water volume per time unit, and the X-axis represents the time, in the graph, two curves 40 and 42 (the first and second curve, respectively) have been drawn representing different cases. The curves have been drawn here as solid lines, but may also consist of measuring points where the measurements are carried out at separate points in time.
The first curve 40 pertains to a case where the flow gradually decreases, i.e. there is reason to suspect that the water-separating effect in the fuel filter is gradually impaired and that more and more water passes through the filter, which must obviously be avoided, in this case, the analysis is carried out by comparing the measuring values with a first threshold value TR1 , and if the measuring value is below said first threshold value, the analysis device 26 is adapted to generate information for the indication signal 28, indicating that the fuel filter's 18 function is not acceptable. This occurs at the point in time t1 . There is of course also a possibility that the fuel actually contains very little water, as may be determined by further tests.
The second curve 42 pertains to a case where the flow increases. In this case, there is reason to suspect that the fuel has too high a water content, and the analysis device 26 is adapted to generate information for the indication signal 28, related to the fuel's water content. Here, the analysis device 26 has a second threshold value TR2, exceeding said first threshold value TR1 , and if the measuring value exceeds this second threshold value TR2, the analysis device 28 is adapted to generate information for the indication signal 28, indicating that the water content in the fuel may be unacceptably high. In the graph, this occurs at the point in time t2. The second threshold value has been allocated a value representing a level, where the water content in the fuel 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 with each other, that fuel may flow from the right main tank to the left main tank in the figure. A transfer pump 32 is arranged to pump fuel from the main tank 9 to a transfer tank 31 , which is significantly smaller than the main tanks. The fuel pump 1 0 is arranged in the transfer tank 31 . Both the transfer pump 32 and the fuel pump 10 are controlled by control signals 14 from the control device 1 2. It should be noted that the transfer pump 32 may also be arranged in the main tank 9, and that the fuel pump 1 0 may be arranged outside the transfer tank 31 . There is also a return pipe 34 between the transfer tank 31 and one of the main tanks 9. if the transfer tank 31 becomes full, fuel may be brought back to the main tank 9 via the return pipe 34,
The fuel filter 18 is here arranged downstream of the transfer pump 32.
If it turns out that the fuel has a high water content, if may be advantageous to reduce the pressure of the fuel that is to pass through the fuel filter, in order thus to increase the filter's ability to separate water from the fuel. In order to achieve this, the indication signal 28 is adapted to be applied to the control device 1 2, so that the amount of fuel pumped by the fuel pump 1 0, 32, and especially the transfer pump 32, is adapted to be controlled with said control signal 14, depending on the information related to the fuel filter's 16 function and/or the fuel's water content, the information of which is applied to the control device 1 2 by means of the indication signal 28. Preferably, the amount of fuel pumped is reduced if the water content increases.
For example, the transfer tank 31 may intentionally be filled up in order to force the fuel back to the main tank 9 via the return pipe 34, and thus to filter the fuel one more time.
Figure 4 shows a schematic and simplified image of a vehicle 36 comprising a combustion engine 8, a fuel system for the combustion engine, where the fuel system comprises a fuel tank system 8 with a main tank intended for fuel, at least one fuel pump 1 0, 32 arranged in connection with the main tank and a control device 1 2 adapted to control the pumping of fuel 1 3 from the fuel tank system to the combustion engine. Further, a processing device 2 is arranged, functioning according to the above description, and which e.g. is adapted to receive a measuring signal 22 from the fuel filter 1 8, containing measuring values related to the separated water 20, and to generate an indication signal 28.
The invention also comprises a computer program in vehicles, wherein said computer program comprises program code to cause a processing unit, or a computer connected to a processing unit, to carry out the steps according to the method described above.
The invention also comprises a combustion engine and a vehicle, which comprise the processing device as described above.
The present invention is not limited to the preferred embodiments described above. Various alternatives, modifications and equivalents may be used. The embodiments above shall therefore not be deemed to limit the scope of the invention, which is defined by the enclosed patent claims.

Claims

Claims
1 . A method in a processing device (2) for a fuel system (4) for a combustion engine (8), 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 (1 0, 32) arranged in connection with the main tank (9), a control device (1 2) adapted to control the pumping of fuel from the fuel tank system (8) to the combustion engine (6) via a fuel pipe (1 3) by the means of a control signal (14) to said fuel pump (1 0, 32), and a fuel filter (18) through which the pumped fuel is intended to pass, the fuel filter (16) comprising a water-separating part intended to separate water from the fuel, a measuring device (1 8) arranged in connection with the fuel filter (1 8); and wherein the processing device (2) comprises a memory device (24) and an analysis device (28),
characterised In that the method comprises the steps:
- to carry out, with the measuring device, measurements of one or several parameters related to the separated water;
- to determine measuring values for said parameters;
- to generate a measuring signal comprising said measuring values;
- to receive said measuring values in the processing device;
- to store said measuring values in the memory device;
- to analyse said stored measuring values in the analysis device, using a set of predetermined rules related to the function of the fuel filter;
- to generate an indication signal depending on said analysis, wherein the indication signal comprises information related to the fuel filter's function.
2. The method according to claim 1 , wherein said measuring values are stored together with the points in time when the measurements were carried out.
3. The method according to claim 1 or 2, wherein said predetermined rules comprise determining how said measuring values change over time and generating said information for the indication signal, depending on said change.
4. The method according to any of claims 1 -3, wherein said
predetermined rules comprise comparing said measuring value with a first threshold value TR1 , and if the measuring value is below said first threshold value, generating information for the indication signal, indicating that the fuel filter's function is not acceptable.
5. The method according to any of claims 1 -4, wherein the method comprises analysing said stored measuring values in the analysis device, using a set of predetermined rules related to the fuel's water content.
6. The method according to claim 5, wherein the method comprises generating information for the indication signal, related to the fuel's water content.
7. The method according to any of claims 5-6, wherein the method comprises generating information for the indication signal, related to the fuel's water content, if said measuring values exceed a second threshold value TR2, exceeding a first threshold value TR1 .
8. The method according to any of claims 1 -7, wherein the amount of fuel pumped by the fuel pump is adapted to be controlled with said control signal, depending on the generated indication signal.
9. The method according to any of claims 1 -8, wherein said parameter pertains to at least a water level in a container intended for the separated water.
1 0. The method according to any of claims 1 -9, wherein said parameter pertains to a flow for the separated wafer.
1 1 . A processing device (2) for a fuel system (4) for a 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 (1 0, 32) arranged in connection with the main tank (9), a control device (1 2) adapted to control the pumping of fuel from the fuel tank system (8) to the combustion engine (6) via a fuel pipe (13) by the means of a control signal (14) to said fuel pump (1 0, 32) and a fuel filter (1 6) through which the pumped fuel is intended to pass, the fuel filter (16) comprising a water-separating part intended to separate the water from the fuel, and a measuring device (1 8) arranged in connection with the fuel filter (16), and intended to carry out measurements of one or several parameters related to the separated water (20), to determine measuring values for said one or several parameters and to generate a measuring signal (22) comprising said measuring values,
characterised in that the processing device (2) comprises a memory device (24) and an analysis device (26), and that the processing device (2) is adapted to receive said measuring signal (22) and to store said measuring values in the memory device (24), wherein the analysis device (26) is adapted to analyse said stored measuring values, using a set of predetermined rules related to the function of the fuel filter and to generate an indication signal (28) depending on said analysis, wherein the indication signal (28) comprises information related to the fuel filter's function.
1 2. The processing device (2) according to claim 10, wherein said measuring values are stored together with the points in time when the
measurements were carried out.
1 3. The processing device (2) according to claim 1 1 or 12, wherein said predetermined rules comprise determining how said measuring values change over time and wherein the analysis device (26) is adapted to generate said information in the indication signal (28), depending on said change.
14. The processing device (2) according to any of claims 1 0-1 2, wherein said predetermined rules comprise comparing said measuring value with a first threshold value TR1 , and if the measuring value is below said first threshold value, the analysis device (26) is adapted to generate information for the indication signal (28), indicating that the fuel filter's (1 6) function is not acceptable.
1 5. The processing device according to any of ciaims 1 1 -14, wherein the analysis device (26) is adapted to analyse said stored measuring vaiues, with the use of a set of predetermined rules related to the fuel's water content.
1 6. Processing device (2) according to claim 1 5, wherein said analysis device (26) is adapted to generate information for the indication signal (28), related to the fuel's water content.
1 7. Processing device (2) according to any of ciaims 1 5-1 6, wherein the analysis device (26) has a second threshold value TR2 exceeding said first threshold value TR1 , and if said measuring vaiues exceed said second threshold value TR2, the analysis device (26) is adapted to generate information for the indication signal (28), related to the fuel's water content.
1 8. The processing device (2) according to any of claims 1 1 -1 7, wherein said indication signal (28) is adapted to be applied to said control device (1 2), wherein the amount of fuel pumped by the fuel pump (1 0) is adapted to be controlled by the means of said control signal (14), depending on the indication signal (28).
1 9. The processing device according to any of claims 1 1 -1 8, wherein said parameter pertains to at least one water level in a container (30) intended for the separated water (20).
20. The processing device according to any of claims 1 1 -1 9, wherein said parameter pertains to a flow for the separated water (20).
21 . A computer program comprising program code to cause a processing device, or a computer connected to a processing device, to carry out the steps in the method according to any of claims 1 -10.
22. Combustion engine characterised in that it comprises a processing device according to any of the claims 1 1 -20.
23. Vehicle characterised in that it comprises a processing device according to any of the claims 1 1 -20.
PCT/SE2014/050984 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 WO2015030662A1 (en)

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DE112014003464.9T DE112014003464T5 (en) 2013-08-30 2014-08-27 Process for a processing device in connection with water separation in a fuel filter, and processing device
BR112016002249A BR112016002249A2 (en) 2013-08-30 2014-08-27 method for a processing device in association with water separation in a fuel filter, and said processing device

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Citations (6)

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WO2001033069A1 (en) * 1999-11-03 2001-05-10 Ufi Universal Filter International S.P.A. Unit for automatically bleeding off the water which separates in a vehicle fuel filter, in particular for diesel engines
US6514404B1 (en) * 1998-10-17 2003-02-04 Filterwerk Mann & Hummel Gmbh Filter device
US20030085180A1 (en) * 2001-11-06 2003-05-08 Mark Akins Water-in-fuel abuse detection
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US20100000916A1 (en) * 2006-02-06 2010-01-07 Hengst Gmbh & Co. Kg Fluid Filter Comprising a Protected Liquid Sensor
US20110011807A1 (en) * 2007-12-06 2011-01-20 Mann+Hummel Gmbh Device and method for operating a fuel filter

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US6514404B1 (en) * 1998-10-17 2003-02-04 Filterwerk Mann & Hummel Gmbh Filter device
WO2001033069A1 (en) * 1999-11-03 2001-05-10 Ufi Universal Filter International S.P.A. Unit for automatically bleeding off the water which separates in a vehicle fuel filter, in particular for diesel engines
US20030085180A1 (en) * 2001-11-06 2003-05-08 Mark Akins Water-in-fuel abuse detection
US20100000916A1 (en) * 2006-02-06 2010-01-07 Hengst Gmbh & Co. Kg Fluid Filter Comprising a Protected Liquid Sensor
US20080150552A1 (en) * 2006-12-21 2008-06-26 Straub Robert D Apparatus and method for sensing water within a fuel-water separator assembly
US20110011807A1 (en) * 2007-12-06 2011-01-20 Mann+Hummel Gmbh Device and method for operating a fuel filter

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SE1351002A1 (en) 2015-03-01
DE112014003464T5 (en) 2016-04-07
BR112016002249A2 (en) 2017-08-01

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