• 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 for detecting a river block (205) in a fluid system (201), which river block is arranged between a first fluid line (203) and a second fluid line connected to the first fluid line via the river block (205). The method comprises controlling a river head (202) connected to the first fluid line (203) so that at least one inflow (208) is created into the first fluid line (203) and controlling a dosing unit (206) connected to the second fluid line (204). so that at least one effluent (209, 219) out of the second fluid line is created. The method comprises creating one of the said rivers (209) as a time-dependent flood of known size and with a time constant T and the remaining said at least one river (208, 219) as a substantially constant flow over the time constant T so that pressure fluctuations occur in at least one of said fluid lines (203, 204), to supply the amplitude of the pressure fluctuations and on the basis of the measured amplitude detect the river blockage (205).
    公开号:SE1350705A1
    申请号:SE1350705
    申请日:2013-06-10
    公开日:2014-12-11
    发明作者:Johan Wängdahl；Kurt Källkvist
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION The present invention relates to a method for detecting a blocked flood. The invention is particularly, but not exclusively, directed to the performance of such a method for detecting the degree of clogging of a filter in an SCR exhaust purification system. The invention also relates to a computer program product comprising computer program code for implementing a method according to the invention, as well as an electronic control unit.
    BACKGROUND ART In order to meet stringent requirements for exhaust gas purification, today's motor vehicles are usually equipped with a catalyst in the exhaust line to achieve catalytic conversion of environmentally hazardous constituents in the exhaust gases into less environmentally hazardous substances. A method used to achieve efficient catalytic conversion is based on injecting a reducing agent into the exhaust gases upstream of the catalyst. An reducing agent present in the reducing agent or formed by the reducing agent is fed by the exhaust gases into the catalyst where it is adsorbed on the active compounds in the catalyst, which gives rise to accumulation of the reducing agent in the catalyst. The accumulated reducing agent can either desorb, i.e. detach from the active compounds, or react with an exhaust gas to convert this exhaust gas to a harmless hearth. Such a reduction catalyst can, for example, be of the SCR type (SCR = Selective Catalytic Reduction). This type of catalyst is still referred to as the SCR catalyst. An SCR-2 catalyst selectively reduces NO in the exhaust gases but not the oxygen in the exhaust gases. If an SCR catalyst is usually injected, a ureal or ammonia-based reducing agent, e.g. AdBlue, in the exhaust gases upstream of the catalyst. During the injection of urea into the exhaust gases, ammonia is formed and it is this ammonia that constitutes the reducing substance that contributes to the catalytic conversion in the SCR catalyst.
    SE1150862 and WO2011142708 describe SCR systems for injecting reducing agent into an exhaust system upstream of an SCR catalyst. This type of SCR system includes a tank that hails the reducing agent. The SCR system also has a pump which is arranged to pump up the reducing agent from the tank via a suction hose and supply it via a pressurized hose to a dosing unit which is arranged at an exhaust system of the vehicle, such as e.g. in the case of an exhaust pipe, the exhaust system has. The dosing unit is arranged to inject a required amount of reducing agent into the exhaust pipe upstream of the SCR catalyst according to drivers stored in a control unit of the vehicle. In order to more easily regulate the pressure at small or no dosage amounts, the system can also have a return hose which is arranged from a pressure side and has the system returned to the tank. According to this configuration, it is possible to cool the dosing unit by means of the reducing agent which, when cooled, flows from the tank via the pump and the dosing unit back to the tank. In this way an active cooling of the dosing unit is provided. The return flow from the dosing unit to the container is essentially constant. The SCR system also includes a filter for filtering the reducing agent before dosing by the dosing unit. This filter is arranged to protect the dosing unit from being clogged by particles, such as e.g. soil particles, dirt, etc. The filter can be a paper filter, but other types of filters are of course common.
    A problem with such filters is that they can be easily clogged, which leads to a river blockage so that the reducing agent cannot be dosed as intended. Such a flow blockage must be detected and guarded, otherwise the emissions of NOx gases increase. In WO2011142708 this problem is solved by continuously feeding accumulated amount of liquid which is dosed via a dosing unit and based on these feeds dispensing if the filter needs to be replaced. This procedure is based on the assumption that a certain amount of dosing reducing agent leads to a certain degree of clogging of the filter. To avoid filter changes in inconvenient and condensed exhaust gas purification, it is advisable to provide a method to detect if the filter is clogged.
    One way to detect a river blockage, for example in the form of a clogged filter, is to feed the pressure drop across the clogged or partially clogged filter. Knowing the flow through the filter can determine the size of the blockage. However, it is required that the pressures in the fluid lines adjacent to the filter on some sides of the filter are known, as well as the flow through the blockage. This requires hardware in the form of pressure sensors in connection with the fluid lines. Alternatively, it is required that at least the fluid line on one side consists of a closed volume with known elasticity. An example of the latter is a pressurized container of known size containing a pressurized medium, which container is emptied through a block, for example in the form of a choke. With knowledge of the medium, the size of the blockage can then be estimated. Unfortunately, this technique cannot be used in a fluid system where there are simultaneous unknown inflows and outflows, since the net flow into or out of the container determines the pressure drop.
    SUMMARY OF THE INVENTION An object of the present invention is to provide a method for detecting a river block in a fluid system at an early stage by simple means without affecting the normal function of the fluid system.
    According to a first aspect of the invention, this object is achieved by a method for detecting a river block in a fluid system, which river block is arranged between a first fluid line and one to the first fluid line via the river block connected to another fluid line, the method comprising controlling one connected to the first fluid line flow head said that at least one inflow into the first fluid line is created and controlling a dosing unit connected to the second fluid line said that at least one outflow out of the second fluid line is created. The method further comprises creating one of said rivers as a time-dependent flood of known size and having a time constant T and remaining said at least one river as an Over time constant T constant or substantially constant flow so that pressure fluctuations occur in at least one of said fluid lines, that feed the amplitude of the pressure fluctuations in one of said fluid lines where pressure fluctuations occur and on the basis of the measured amplitude detect the river blockage.
    Since the amplitude of the pressure fluctuations depends on the size of the river block, it is possible to detect whether a river block exists by feeding it. The absence of a river blockage means a smaller amplitude of the pressure fluctuations. The amplitude of the pressure fluctuations increases as the river block becomes larger, as the fluid conduits through the block are increasingly delimited from each other. With the method according to the invention, a river blockage can be detected at an early stage before it becomes critical and risks giving serious consequences. This is also done by only supplying the pressure in one of the fluid lines connected to the blockage. That is, with a pressure sensor, which reduces the need for hardware compared to the initially described kanda technology where a pressure drop is fed over the blockage. When the procedure is performed in e.g. in addition, an SCR system as initially described does not affect the normal operation of the system, since the process can be performed independently of the constant or substantially constant flow to the respective fluid conduits and since a time-dependent flow head is already in place.
    The river blockage can thus be detected at the same time as fluid flows through the system as usual.
    According to one embodiment, the river block is detected on the basis of the measured amplitude, the size of the time-dependent river and the volume V and elasticity of the fluid system E. By karma to these quantities, a more accurate detection of the river block is obtained.
    According to one embodiment, the measured amplitude is used as a test variable ti which is tested against an alarm criterion, and, given that the alarm criterion is met, an error code is generated. In this way, a control unit which is arranged to implement the method can automatically alarm when the river blockage needs to be actuated. By directly using the measured amplitude, no calculations of the actual size of the river blockage need be performed by the control unit.
    According to a further embodiment, the size of the river block is calculated on the basis of the measured amplitude, the size of the time-dependent flow, the volume V1 and elasticity of the first fluid line and the volume V2 and elasticity of the second fluid line. With knowledge of the mentioned quantities, the size of a block can be calculated , which is useful if the blockage only becomes critical as it exceeds a certain size.
    You can then take action at the right time and avoid, for example, changing filters as the filter is only slightly clogged and the fluid system still works satisfactorily.
    According to one embodiment, the calculated size is used as a test variable t1 which is tested against an alarm criterion, and, given that the alarm criterion is met, an error code is generated. In this way, a control unit which is arranged to implement the method can automatically sound an alarm when the river blockage needs to be actuated.
    According to one embodiment, the alarm criterion is met if the test variable ti exceeds a predetermined threshold value. This is an easy way to determine if the river blockage needs to be remedied. Regardless of whether the calculated magnitude of the river block or the measured amplitude of the pressure fluctuations is used as a test variable t1, the threshold value can advantageously be set so that it is optimized for the current fluid system, i.e. with respect to e.g. fluid input systems, elasticity, fluid properties, environmental parameters such as pressure and temperature, time-dependent flow size, etc.
    According to a further embodiment, the method is carried out for a system in which the said fluid lines differ in volume. Preferably, the volume of one of said fluid conduits is at least ten times greater than the volume of another of said fluid conduits. In such a system, the pressure fluctuations can become more marked in the smaller of the fluid conduits, which facilitates the detection of the river blockage.
    According to another embodiment, the time-dependent flow is created in the one of the said fluid lines which has the least volume. This usually gives the most marked pressure fluctuations.
    According to a further embodiment, the amplitude of the pressure fluctuations in the one of the said fluid lines which has the least volume is fed. According to another embodiment, the amplitude of the pressure fluctuations in the one of the named fluid lines where the time-dependent flow is created is fed. In these ways, it is easiest to detect the pressure fluctuations because they usually become clearest in these cases. Of course, the one of the said fluid lines which has the least volume can coincide with that of the said fluid lines where the time-dependent flow is created.
    According to another embodiment, at least one named inflow is created into the first fluid line by controlling a river head in the form of a pump so that fluid is pumped from a tank into the said first 8 fluid line. By using a pump, the said inflow can be created either as a time-dependent or as a constant or substantially constant flocle.
    According to a variant of this embodiment, the second fluid line fluid is returned to said tank in a named outflow in the form of a return flow, and fluid is led out of the fluid system in a new outflow in the form of a consumption flow. In this way a flow of fluid is created in the system, which is advantageous if some part of the fluid system is dependent on flow through to be cooled. For example, in a system for injecting reducing agent upstream of an SCR catalyst, a portion of the reducing agent is often used for dosing to the exhaust system via the effluent of the dosing unit and the portion of the reducing agent that is not dosed is returned in a return flow to the tank. This part of the reducing agent is advantageously used as a coolant to avoid overheating of the dosing unit. The reducing agent in the return flow is filtered and the SCR system therefore becomes to some extent self-cleaning. The required filtered reducing agent thus does not contribute to further clogging the filter.
    According to one embodiment, the dosing unit is controlled to create the said time-dependent flow. This is advantageous in applications where it is desired that the fluid instead of through a continuous outflow should leave the fluid system in the form of discrete doses, as is often the case in a system for injecting reducing agents upstream of an SCR catalyst.
    According to a further embodiment, the time-dependent flood 30 is created in the form of a time-periodic floc. Preferably, the 9 time periodic flood is created in the form of a square wave-like flood. Such a flood is easily achieved by, for example, opening and closing a valve, whereby a square wave-like flood with a certain time constant is created. Preferably the time periodic flow is created with a period time of 0.1-10 s, more preferably 0.2-5 s, even more preferably 0.25-1 s.
    According to one embodiment, the method is carried out in a fluid system comprising a river blockage in the form of a filter which is somewhat clogged, the degree of clogging of the filter being detected.
    According to another embodiment, the process for performing a reducing agent injection system, such as a urea or ammonia-based reducing agent, is performed upstream of an SCR catalyst in an exhaust line from an internal combustion engine. The process is well suited for such a system because the system usually comprises a time-dependent river head, such as a dosing unit which dispenses reducing agents in discrete doses to the exhaust line, and the clogging of a filter in such a system may need to be fed independently of the substantially constant rivers. is in the system. The method is further advantageous because no additional pressure sensor is needed but the river blockage can be detected with hardware existing in the system.
    According to a further aspect of the invention, the object is achieved by a computer program downloadable to the internal memory of a computer, comprising software for controlling the steps according to the method proposed above when said program [Kars on a computer.
    According to another aspect of the invention, the object is achieved by a computer program product comprising a data storage medium which is readable by a computer, the computer program code of a computer program as above being stored on the data storage medium.
    According to a further aspect of the invention, the object is achieved by an electronic control unit comprising an execution means, an execution means connected memory and one to the execution means connected data storage medium, the computer program code of a computer program as above being stored on said data storage medium.
    According to another aspect of the invention, the object is achieved by a motor vehicle comprising an electronic control unit as above.
    Other advantageous features and advantages of the invention will become apparent from the following description.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail below with the aid of exemplary embodiments with reference to the accompanying drawings, in which Fig. 1 shows a schematic sketch of a system in which the inventive method can be carried out, Fig. 2 shows a schematic sketch of a system for injection of reducing agent upstream of an SCR catalyst, and Fig. 3 shows a schematic sketch of a control unit for implementing a process according to the invention. DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION By river block is meant a river block of some degree, i.e. also a partial block of a river. The partial block may be in a filter or located elsewhere in the fluid system, e.g. at a strangulation or the like.
    Fluid system refers to a liquid or gas system. Preferably, but not necessarily, it is intended to have a system for flowing through a liquid. Preferably, but not necessarily, it refers to a fluid system in a vehicle. The fluid system can be, for example, a system for injecting reducing agent upstream of an SCR catalyst in an exhaust line from an internal combustion engine, a fuel system intended to supply an internal combustion engine with fuel, a hydraulic brake system in a vehicle, a hydraulic system, a pneumatic system, etc.
    By fluid conduit is meant a passage for holding and transporting a fluid, such as e.g. a reductant in liquid form. The pipe can be a rudder of any dimension. The cable can consist of an arbitrary, suitable material, such as e.g. plastic, rubber or metal !.
    By dosing unit is meant a unit comprising a valve device of some kind, which can be controlled to create a constant or time-dependent flow of [(and size. 12 By a constant or substantially constant flow is meant a flow which has a time constant which is considerably larger than the time constant of the time-dependent river, so that the variations of the constant or substantially constant river over time take place much more slowly than the variations of the time-dependent river over time.
    A first fluid system 101 in which the method according to the invention can be carried out is shown schematically in Fig. 1. The fluid system comprises a river shell in the form of a pressurized fluid container 102 with a volume VB, a first fluid line 103 with a first volume Vi, a second fluid line 104 with a second volume V2 and a river block 105 disposed between the first and second fluid conduits. A dosing unit 106 is arranged in connection with the second fluid line, as well as a pressure sensor 107.
    To calculate the magnitude of the river block 105, an inflow 108 is created into the first fluid line 103 from the pressurized container 102. Using the metering unit 106, a time-dependent effluent 109 of magnitude is created and with a time constant T (i.e. the time it takes for the flood). to increase / decrease to about 63% of its maximum level) from the second fluid line 104. Pressure fluctuations then occur in the fluid system 101. By means of the pressure sensor 107 the pressure in the second fluid line 104 is measured and the amplitude of the pressure fluctuations is determined. Since the amplitude of the pressure fluctuations is a function of the magnitude of the river block, a block can be detected, for example, by observing how the amplitude changes over time. The larger the river blockage, the greater the amplitude of the pressure fluctuations. With knowledge of the inlet volumes VB, V1 and V2 of the fluid system and the elasticity Eg of the container 102 and the elasticity E1 and E2 of the fluid lines 13 as well as the size of the outflow, the size of the river block can be estimated. In the event that throttles of the same magnitude as or greater than the river blockage 105 occur in the fluid system 101 between the pressurized container 102 and the first fluid conduit 103, the volume and elasticity of the container 102 may be disregarded.
    In a fluid system similar to the system described above, instead of a pressurized container, a pump connected to a fluid tank can be used as a river head. The pump can be controlled to create a time-dependent inflow and the dosing unit can then be arranged to create a constant outflow, or an outflow which is substantially constant Over the time constant of the inflow T. The pressure sensor can be connected to either of the fluid lines, but suitably the fluid system is arranged so that the pressure feeder is connected to the one of the flat fluid lines which has the least volume, since the pressure fluctuations become most marked in this fluid line. Preferably, but not necessarily, this fluid line coincides with the fluid line where the time-dependent flow is created, which can lead to more marked pressure fluctuations.
    A fluid system 201 for injecting reducing agent upstream of an SCR catalyst (not shown) in an exhaust line from an internal combustion engine is schematically illustrated in Fig. 2. The system comprises a flow head in the form of a pump 202 arranged to pump in reducing agent from a fluid line 211. a tank 212 and into a fluid line 203. In direct connection to the fluid line 203 there is a main filter 205 arranged and downstream there is a fluid line 204. Adjacent to this there is a 14 control unit (not shown) electrically controllable dosing unit 206, which arranged to inject via a metering valve 210 into reducing agent in said exhaust line (not shown). The dosing unit 206 comprises an electronic control card (not shown), which is arranged to handle communication with the control unit. The dosing unit 206 may also comprise plastic and / or rubber components, which may melt or otherwise be adversely affected at excessive temperatures. A pressure sensor 207 is arranged to supply the pressure in the second fluid line 204.
    From the dosing unit 206 a return line 213 is arranged, which via a choke 214 leads back to the tank 212. In addition to the main filter 205, a number of filters 215, 216, 217 are arranged in the fluid system. The filter 217 in this case is considerably larger than the main filter 205.
    In use, the pump 202 creates a substantially constant inflow 208 of reducing agent in the fluid line 203. The reducing agent is filtered at the main filter 205 and passes into the fluid line 204. Downstream of the fluid line 204, the reducing agent is metered out to the exhaust line by the metering unit 206, which is controlled to create a discharge 209 of known size from the second fluid line 204 in the form of a square wave-like flow by opening and closing the metering valve 210. Via the metering unit 206, non-metered reducing agent is also led back to the tank 212 in a substantially constant return flow 219 via the restrictor 214. the dosing unit 206 can be continuously cooled with the aid of reducing agent. When the metering valve 210 is closed, a pressure is built up in the fluid line 204 against the throttle 214 by means of the pump 202 and when the metering valve 210 is open, the pressure is released because reducing agents then flow out through both the metering valve and through the throttle 214. the control unit calculates the amplitude of the pressure fluctuations and from this the degree of clogging of the main filter 205 can be determined. On the basis of the measured amplitude, the magnitude of the time-dependent flow, the volume Vi and elasticity E1 of the fluid line 203 and the volume V2 and elasticity E2 of the fluid line 204, the degree of clogging of the main filter 205 is calculated.
    In this embodiment of the method according to the invention, the fluid system 201 is arranged with a first fluid line 203 whose volume V1 is about ten times the volume V2 of the second fluid line 204. The time-dependent flow 209 is created in the form of a square wave in the second fluid line 204, at which also the pressure is fed. The pressure fluctuations are therefore easily detected with the aid of the pressure sensor 207. The degree of clogging of the main filter 205 can be determined independently of the substantially constant inflows and outflows 208, 219 of reducing agents in the fluid lines 203, 204. In this case, the substantially constant rivers meant that the time constant of the time-dependent, in this case square weakly shaped, river 209 is considerably smaller than any time constants of the other rivers 208, 219. This may mean, for example, that the time constant T of the time-dependent river is in the order of tenths of a second, while the other rivers vary considerably longer time, as with a time constant in the interval 5-30 s.
    The calculated size of the river block can suitably be used as a test variable in which, with the aid of the control unit 16, it is tested against an alarm criterion. Given that the alarm criterion is met, an error code is generated. The alarm criterion can, for example, be set so that it is met if the test variable ti exceeds a predetermined threshold value.
    Instead of calculating the magnitude of the surface blockage, it may be appropriate to use the measured amplitude of the pressure fluctuations as a test variable ti. In this case, the threshold value can be set so that the magnitude of the fluid system is taken into account, as well as the volumes and elasticity of the fluid lines so that an actual value of the size of the surface blockage does not need to be calculated. Lampy thresholds can e.g. determined empirically or by means of simulation. For some applications, however, the quantities of the fluid system may vary with, for example, temperature and pressure. In, for example, industrial systems, the pressure can vary between about 500-2000 bar and the elasticity of the system depends to a large extent on the pressure. In these cases it may be advantageous to either calculate the size of the surface block and use this as a test variable ti or to use a threshold value which is e.g. pressure dependent.
    Computer program code for implementing a method according to the invention is suitably included in a computer program which can be loaded into the internal memory of a computer, such as the internal memory of an electronic control unit of a motor vehicle. Such a computer program is suitably provided via a computer program product comprising a data storage medium which can be read by an electronic control unit, which data storage medium has the computer program stored there. Said data storage medium is, for example, an optical data storage medium in the form of a CD-ROM, a DVD-17 disc, etc., a magnetic data storage medium in the form of a hard disk, a floppy disk, a cassette tape, etc., or a flash memory or a memory of the type ROM, PROM, EPROM or EEPROM.
    Fig. 3 schematically illustrates an electronic control unit 40 comprising an execution means 41, such as a central processor unit (CPU), for executing computer software. The execution means 41 communicates with a memory 42, for example of the RAM type, via a data bus 43. The control unit 40 also comprises data storage medium 44, for example in the form of a Flash memory or a memory of the type ROM, PROM, EPROM or EEPROM. The execution means 41 communicates with the data storage medium 44 via the data bus 43. A computer program comprising computer program code for implementing a method according to the invention is stored on the data storage medium 44.
    The invention is of course not limited in any way to the embodiments described above, but a number of possibilities for modifications thereof should be obvious to a person skilled in the art, without this deviating from the basic idea of the invention as defined in the appended claims. 18
    权利要求:
    Claims (21)
    [1]
    A method for detecting a river block (105, 205) in a fluid system (101, 201), the river block being arranged between a first fluid line (103, 203) and a second connected to the first fluid line via the river block (105, 205). fluid conduit (104, 204), the method comprising controlling a river skull (102, 203) connected to the first fluid conduit (102, 202) so that at least one inflow (108, 208) into the first fluid conduit (103, 203) is created. and controlling a dosing unit (106, 206) connected to the second fluid line (204, 204) so that at least one outflow (109, 209, 219) out of the second fluid line is created, characterized in that the method comprises creating one of the said the rivers (109, 209) as a time-dependent flood of kand size and with a time constant T and the remaining said at least one river (108, 208, 219) as an Over time constant T constant or substantially constant flow so that pressure fluctuations occur in at least one of said f sound lines (103, 104, 203, 204), to supply the amplitude of the pressure fluctuations in one of said fluid lines (104, 204) where pressure fluctuations occur and on the basis of the measured amplitude detect the river blockage (105, 205).
    [2]
    Method according to claim 1, characterized in that the river block (105, 205) is detected on the basis of the measured amplitude, the magnitude of the time-dependent flow (109, 209) and the volume V and elasticity E of the fluid system.
    [3]
    Method according to claim 1 or 2, characterized in that the measured amplitude is used as a test variable ti which is tested against an alarm criterion, and that, given that the alarm criterion is met, an error code is generated.
    [4]
    Method according to claim 1, characterized in that the size of the river block (105, 205) is calculated on the basis of the amplitude measured, the size of the time-dependent flow (109, 209), the volume V1 of the first fluid line and elasticity E1 and the volume V2 of the second fluid line. and elasticity E2.
    [5]
    Method according to claim 4, characterized in that the calculated size is used as a test variable ti which is tested against an alarm criterion, and that, given that the alarm criterion is met, an error code is generated.
    [6]
    Method according to claim 3 or 5, characterized in that the alarm criterion is met if the test variable ti exceeds a predetermined threshold value.
    [7]
    A method according to any one of the preceding claims, characterized in that it is carried out for a system in which the said fluid lines (103, 104, 203, 204) differ in volume.
    [8]
    A method according to claim 7, characterized in that it is performed for a system where the volume of one of said fluid conduits (203) is at least ten times larger than the volume of another of said fluid conduits (204).
    [9]
    Method according to claim 7 or 8, characterized in that the time-dependent flow is created in that of the said fluid lines (104, 204) which has the least volume.
    [10]
    A method according to any one of claims 7 to 9, characterized in that the amplitude has the pressure fluctuations fed into that of the said fluid lines (104, 204) having the least volume.
    [11]
    A method according to any one of the preceding claims, characterized in that the amplitude has the pressure fluctuations fed into the one of the said fluid lines (104, 204) where the time-dependent flow (109, 209) is created.
    [12]
    A method according to any one of the preceding claims, characterized in that at least one named inflow (208) into the first fluid line (203) is created by controlling a river head in the form of a pump (202) so that fluid is pumped from a tank (212 ) into the said first fluid line (203).
    [13]
    A method according to claim 12, characterized in that from the second fluid line (204) fluid is returned to said tank (212) in a named outflow in the form of a return flow (219), and fluid is led out of the fluid system (201) in a named outflow in the form of one consumption flood (209).
    [14]
    A method according to any one of the preceding claims, characterized in that the dosing unit (106, 206) is controlled to create the said time-dependent flow (109, 209). 21
    [15]
    A method according to any one of the preceding claims, characterized in that the time-dependent flood (109, 209) is created in the form of a time-periodic flock.
    [16]
    A method according to any one of the preceding claims, characterized in that it is performed for a fluid system comprising a river block (105, 205) in the form of a flake-clogged filter, the degree of clogging of the filter (105, 205) being detected.
    [17]
    Process according to any one of the preceding claims, characterized in that the process is carried out for a system (201) for injecting reducing agent upstream of an SCR catalyst in an exhaust line from an internal combustion engine.
    [18]
    A computer program comprising computer program code for causing a computer to implement a method according to any of claims 1-17 when the computer program code is executed in the computer.
    [19]
    A computer program product comprising a data storage medium 20 readable by a computer, wherein the computer program code of a computer program according to claim 18 is stored on the data storage medium.
    [20]
    An electronic control unit (40) comprising an execution means (41), a memory (42) connected to the execution means and a data storage medium (44) connected to the execution means, the computer program code of a computer program according to claim 18 being stored on said data storage medium (44).
    [21]
    A motor vehicle comprising an electronic control unit (40) according to claim 20. 43 211 e /. 208 2 207 210/209
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    同族专利:
    公开号 | 公开日
    SE537396C2|2015-04-21|
    DE112014002374T5|2016-01-28|
    DE112014002374B4|2019-09-19|
    WO2014200413A1|2014-12-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP4373684B2|2003-02-19|2009-11-25|株式会社フィリップスエレクトロニクスジャパン|Filter clogging monitoring device and bedside system|
    AT500849B8|2004-11-15|2007-02-15|Pankl Emission Control Systems|urea dosing|
    JP4165896B2|2007-02-19|2008-10-15|ボッシュ株式会社|Reducing agent path clogging determination device and reducing agent path clogging determination method|
    US8161808B2|2009-02-24|2012-04-24|GM Global Technology Operations LLC|Exhaust treatment diagnostic system and method|
    JP5534602B2|2009-11-06|2014-07-02|ボッシュ株式会社|Abnormality detection device and abnormality detection method for reducing agent injection valve|
    SE535326C2|2010-04-23|2012-06-26|Scania Cv Ab|Method and system for determining the need for replacement or cleaning of a filter unit in a liquid dosing system of an SCR system|
    SE537849C2|2011-09-22|2015-11-03|Scania Cv Ab|Method and system for determining need for review of a dosage unit in an SCR system|
    US20130079667A1|2011-09-28|2013-03-28|General Electric Company|Flow sensor with mems sensing device and method for using same|
    DE102012201595A1|2012-02-03|2013-08-08|Robert Bosch Gmbh|Method for loading diagnosis of filter of internal combustion engine, involves performing diagnosis of load state of filter by measurement of pump current of feed pump on decrease of pressure over filter based on differential pressure|SE541215C2|2017-09-22|2019-05-07|Scania Cv Ab|A system and a method for diagnosing functionality of dosing units of a fluid dosing system|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1350705A|SE537396C2|2013-06-10|2013-06-10|Procedure for detecting a blocked flow|SE1350705A| SE537396C2|2013-06-10|2013-06-10|Procedure for detecting a blocked flow|
    PCT/SE2014/050663| WO2014200413A1|2013-06-10|2014-06-02|Method for detection of a blocked flow|
    DE112014002374.4T| DE112014002374B4|2013-06-10|2014-06-02|Method for detecting a blockage|
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