• 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:
    In a method and a device for determining the sequence of objects by means of a transponder system which has at least one RFID transponder (100) with a transmitting unit and with a receiving unit as well as with RFID objects (130, 135 ), wherein the transceiver unit has a detection area (105) for detecting the RFID tags, it is provided that at least two RFID detections are performed in the detection area of the at least one transponder and based on the at least two RFID detections resulting detection data by means of temporal weighting on the spatial and / or temporal order of the at least two objects (110, 115) is closed. The inventive method and the device can be used in the field of warehousing and logistics.
    公开号:CH713043A1
    申请号:CH01243/17
    申请日:2017-10-12
    公开日:2018-05-31
    发明作者:Brändli Willi；Dousse Marcel
    申请人:Balluff Gmbh；
    IPC主号:
    专利说明:

    Description [0001] The invention is based on a method and a device for determining the order of objects by means of transponder technology in accordance with the generic terms of the respective independent claims.
    Background Art In the field of warehousing, radio-based transponders are known to be used to control the movement of goods, e.g. for logistical purposes. In this case, passive transponders in the form of so-called RFID tags are usually used on the respective goods or storage units, which obtain the energy required for communication and for processing internal processes exclusively from the electromagnetic field of the read / write unit. Passive transponders therefore do not require their own power supply. Partly but also actively powered transponders, so-called active transponder used.
    From a published on 22.10.2014 in Blog posts, Vilant News report "RFID equipped handling units with 100% direction detection" Migros, Switzerland, a storage with an automatic loading control has become known, in which the loading goods or the goods to be loaded by per se known RFID UHF trans pond technology, in which the goods a named RFID tag is attached, is detectable and wherein by means of this technology, a direction detection of the movement of the respective good transporting forklifts he follows. By means of this directional recognition, it is possible to detect whether a forklift, for example, is entering or leaving a gate.
    Furthermore, WO 2008/092803 A1 discloses a device, namely a so-called "RFID tunnel", for the automatic detection of objects, in which only in the near field of an antenna of an RFID reader the signals of an RFID Transponders are read. Possible reflections of the RFID signal in the metallic RFI D tunnel are thereby reduced by means of a special absorber material, which has an absorbing effect in the RFI D frequency range used outside of a spatial reading range.
    DISCLOSURE OF THE INVENTION The invention is based on the finding that the sensitivity in the detection of e.g. on or in a so-called "container" arranged RFID transponders (so-called. "RFID tag") is significantly affected by environmental conditions. Such a container is known to be a loading unit, e.g. a pallet with goods fixed by packaging film goods for the distribution of goods. A transponder usually consists of a transmitting and receiving part that communicates with said RFID tags.
    Such a transponder has a range of about 3-4 times higher Reichwei-te than a transponder in a completely filled with goods container especially in an empty container. The reason for this is a frequency detuning caused by the capacitive change of the signal transmission space between the transponder and an RFID tag, whereby the largest range of the transponder without such material influence, e.g. at a transmission frequency of 880 MHz and this frequency is shifted by the influence of material downwards in the direction of about 865 MHz.
    In addition, the minimum detection field strength of a named transponder is within a relatively large range of motion of a stacker or a relatively large conveyor belt area for substantially li-nienförmigen transport of objects, so that there is a relatively large area to be monitored a single transponder. In addition, a single transponder can not differentiate between objects that are removed differently or objects that are moved or arranged peripherally to the transponder in the direction of the conveyor belt.
    Due to the mentioned, object-dependent or dependent on the environmental conditions range of detection corresponds to the sequence of objects in a first RFID data acquisition often not the actual spatial or temporal order. Therefore, a manual post-control must be performed to determine the order.
    [0009] In the method according to the invention, it is now proposed for objects passing through or passing by in the respective sensitivity or detection range of at least one transponder and / or moving past each having a trans-ponderable RFID tag in addition to a first ( and usually only single RFID detection) make as many more RFID acquisitions. Assuming that at least two objects detectable by means of the transponder technology concerned here are arranged in the detection area, a large number of RFID detection data are thus obtained which, taking into account the time axis, e.g. can be summed up or integrated into a single, meaningful RFID detection value by means of a per se known time-weight method.
    In the mentioned summation or integration of the RFID acquisition data, the detection data can each be provided with temporal weighting factors to determine in the case of multiple transponders for each transponder based on this time information a transit time of a respective object. A value for the transit time can be calculated by dividing or dividing by the number n of the total time values determined for the transit time.
    In the method according to the invention, it can be further provided that, on the basis of the travel times of at least two objects determined in this way, these at least two objects are sorted in time and, as a result, closed to the spatial or chronological order of the objects.
    The acquired and thus time-weighted data can additionally be filtered on the basis of a plausibility check, whereby the quality of recognition with respect to the order of the objects to be detected can be further improved.
    By the above procedure one obtains relatively accurate values for the mean transit time of a respective object through the detection range of the respective transponder, these values in particular from the mentioned, ambient or object-dependent different sensitivities or ranges of the respective Transpon-ders are not affected or independent of it. On the basis of the thus determined values of the mean transit time of each object, the objects thus acquired are sorted by time, in order to obtain the actual spatial or temporal sequence of the objects as a result. The resulting order is then provided to a loading control system for further processing.
    In the method according to the invention, provision can be made for the RFID detections to be carried out until no changes in the mobile objects are detected during RFID detection. Because in this case there are no more time-dependent acquisition data, which are useful for the time-weighted evaluation. Thereby, a meaningful and robust termination condition for the recognition process is defined or provided, whereby it can also be provided that a change is only accepted when an already detected object has already left the detection area again and / or another object has entered the detection area is. In addition, this abort criterion allows a reliable aborting of a program loop for the repeated execution of RFID acquisitions. It can also be provided that a change is assumed when an already detected object has already left the detection range of the transponder again and / or another object has entered or entered the detection range of the transponder.
    In the presence of at least two transponders, the inventive method for detecting objects by each of these transponders can be applied. By time-weighted evaluation of the resulting detection data according to the invention, the quality of the sequence recognition can be considerably improved since, on the one hand, the number of measured data is increased and thus the statistical error is reduced and, on the other hand, possible differences in the sensitivity between the individual transponders are advantageously averaged out ,
    The method makes it possible, in accordance with the known "conveyor problem", to reliably recognize the correct sequence of said objects (for example fork-lift trucks, containers).
    The invention further relates to a device for determining the order of at least two moving objects by means of a transponder system comprising at least one RFID transponder with a transmitting unit and with a receiving unit and with the movable objects respectively arranged RFID tags, wherein the Transmitting / receiving unit has a detection range for detecting the RFID tags, wherein the device in particular a readout module for reading transponder data detected by the at least one RFID transponder and for conversion to corresponding Fliesskomma time data, at least a first processing module for creating wenigs-tens a list of the time data detected RFID tags, at least a second processing module for accumulating or integrating the time data of the detected RFID tags and for dividing the resulting sum or integral value by the number of detected RFID tags to form a middle ren run time of the at least two movable objects, and at least a third processing module for sorting the at least two average cycle times and for determining the order of the at least two movable objects. Such a device can be implemented or implemented with relatively little technical effort and thus relatively low costs.
    In the device, a shift register may further be provided in which the acquired transponder data newly RFID tags are stored and stored there, together with an internationally valid product labeling, and with the cycle times formed. This enables a particularly efficient and thus fast data processing of the captured RFID data, so that the results of the determination of the actual order of the objects can be present in almost real time.
    The proposed method and the corresponding device for detecting the actual sequence of objects affected here are advantageously possible with conventional equipment or without additional and expensive hardware and can therefore be implemented very inexpensively. The quality and reliability in the recognition of the sequence are significantly improved over the prior art.
    Brief Description of the Figures [0020]
    Fig. 1 shows schematically a typical signal detection of two objects by means of transponder technology, wherein there is an error detection of the order of the two objects.
    Fig. 2 shows an embodiment of the inventive method.
    3a, 3b show transponder data ("tags") which are typically recorded on two objects, with an order of the two objects which is initially incorrectly determined after the data acquisition (FIG. 3a) and correctly determined with a time sorting according to the invention. actual order of the two objects (FIG. 3b).
    4a, 4b show transponder data (FIG. 4a) detected on a multiplicity of objects moving past a conveyor belt and data resulting therefrom by time sorting according to the invention and usable for determining the correct sequence of these objects (FIG. 4b).
    5 shows an embodiment of the device according to the invention.
    DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS In FIG. 1, a transponder 100 having a conventional (not shown here) transmitting / receiving antenna is arranged, which has a detection range 105. In the detection area 105, two loading objects 110, 115 are arranged in the example, which move in the direction indicated by the two arrows 120, 125. An RFID tag 130, 135 is arranged in each case schematically at the two loading objects, which in the present exemplary embodiment are passive transponders which do not require their own power supply. It should be noted, however, that the two RFID tags 130, 135 can also be realized by active transponders, as it does not depend on the particular transponder technology used in the present case.
    The corresponding transponder signal 102 is substantially isotropic, i.e., not shown, by the transmit antenna, not shown, in accordance with the waveform shown. evenly in the half-space shown above, radiated. The two RFID tags then send, in a manner known per se, in each case a response signal 140, 145 back to the transponder 100.
    It should be noted that the detection area 105 of the transponder 100, e.g. Depending on the loading status of the respective loading object 110, 115, it can vary considerably. Thus, while the first object 110 is located relatively close to the transponder 100 in the present example, it is assumed herein that the first object 110 has a relatively small object-related range of the detection area 105 of the transponder signal 102 due to its relatively heavy loading of goods causes. On the other hand, while the second object 115 is arranged relatively far away from the transponder 100, it is assumed in the present case that the second object 115 causes a relatively large object-related range of the detection range 105 of the transponder signal 102 due to the relatively low loading of goods.
    Due to the object-dependent range of the transponder signal 102 occurs in the present detection situation that the second object 115 is detected earlier than the first object 110, which in turn means that the order of the two objects, the actually incorrect or .verted order object 2 (115) object 1 (110) is detected.
    With reference to FIG. 2, an embodiment of the method according to the invention will now be described. 2, an RFID detection 205 is performed by the transponder 100 shown in FIG. 1. In the scenario shown in FIG. 1, this means that first the RFID tag returned by the RFID tag 135 Signal 145 of the second object 115 is detected. In step 210, at least the identification or ID data of the second object 115 obtained during the RFID detection 205 and the time t1 of this detection are buffered.
    In the following test step 215 it is now checked whether a change with respect to said objects has occurred in the last RFID acquisition 205, i. E. whether an already detected object has already left the detection range 105 shown in FIG. 1 and / or whether another object, e.g. In the scenario shown in FIG. 1, the first object 110 has entered the detection area 105. In the event of a change detected in this case, the program returns to the beginning of the routine and steps 205 -215 are executed again. In the case of an unrecognized change, the next steps in the routine continue. However, if test 215 indicates that only a single object has been detected in the present acquisition cycle, the routine will be completely terminated, since in this case an order determination is not required or not possible.
    In step 220, the cached 210, in a capture cycle, first for one of the at least two objects acquired data by means of time-weighted accumulation further processed (for example by means of a subsequently described in greater detail in detail "time-weight method). From the data resulting at step 220, at step 225, an average transit time of the currently viewed object is calculated through the entire detection range 105 shown in FIG. Thereafter, it is checked 230 whether the data of all the objects detected in the detection cycle have been further processed 220, 225 in the aforementioned manner. If this is not the case, the system returns to step 220 in order to carry out the described further processing 220, 225 on data acquired by another object.
    If all the objects detected in the detection cycle have been processed in this way, a temporal sorting of the detected objects is carried out in the following step 235 on the basis of the calculated transit times and on the basis of this time data in step 240 a calculation of the chronological order of the objects carried out. In step 245, the order data thus calculated is finally sent e.g. forwarded to a (not shown) loading control system.
    Fig. 3a shows for simplicity at only two objects in a conventional manner detected or measured transponder data ("tags"), with a data acquisition after the first incorrectly determined order of the two objects. Here, the ordinate-applied lower tag index "0" (reference numeral 300) represents the transponder data acquired for the first object, whereas the tag index "1" (reference numeral 305) corresponds to the second object. The abscissa values correspond to the respective acquisition times of the transponder data in the unit ([h: m: s]) (hour: minute: second).
    The measurement points 310, 310 ', 310' 'correspond to the transponder data acquired for the first object and the measurement points 313 to the data acquired for the second object. It is assumed that the transponder signals of the first object are indeed detected for the reasons mentioned with a relatively high transmission power, but with a relatively low attenuation. In contrast, the transponder signals of the second object are detected with a relatively low transmission power and relatively large attenuation. From the data points 310, 313 acquired first in time, the result is the following sequence: first object and second object thereafter.
    In Fig. 3b is now shown how the correct or actual order of the two objects can be determined with the transponder data shown in Fig. 3a, after a described below time sorting. Again, the first object corresponds to the lower transponder data 300 'and the second object corresponds to the upper transponder data 305'. By the evaluation method described below by means of time weighting ("time-weight" method), the two points 315 and 320 result, by means of which an opposite to the evaluation according to Fig. 3a deviating order is concluded, namely the order: second Object and only then first object.
    In the mentioned evaluation method, the initially detected transponder signals of individual tags are converted into a time format suitable for the evaluation. Thus, from the date 01.01.1904.01.00, e.g. for the time stamp 13: 45: 48.502 converted to the following double-precision floating-point number: "3531127549.502". Correspondingly, for a subsequent time stamp 13: 45: 49.993, the floating point number "3531127550.993" results.
    The resulting in the said signal conversion time data in the floating-point format are added or integrated and divided thereby resulting total time value by the number of detected transponder signals. This results in a single, time weighted average for each day or the corresponding object. In this averaging is now significant that in the presence of different time values, in which the majority of the time values are relatively close in time and only relatively few time values in relatively greater time interval to these values, by the averaging automatically sets a weight, through the the impact on the resulting average is also relatively low and therefore not considered due to the few "outliers" mentioned. By a simple comparison of the resulting averages, the order of the objects is now determined.
    In the evaluation of the acquired measured values, a filter can additionally be used. Thus, those not belonging to the observed objects, e.g. stationary tags or non-moving objects. Such stationary tags may e.g. be detected on the basis of unchanging transponder data or described time data. In addition, such objects also appear outside the respective time window to be recorded. Correspondingly recognized objects can either be completely filtered out of the acquired data or a filter can be used for a minimum number of acquisitions, in which only individual detections, which are e.g. be caused by overreach, reflections, or the like, are filtered out and thus not taken into account in the evaluation.
    FIGS. 4 a and 4 b show transponder data 400 (FIG. 4 a) detected on a plurality of objects moved on an RFID transponder 100 on a conveyor belt, as well as resulting from time weighting according to the invention for determining the correct order of these objects individually usable time data or time points 405, 410, 415, 420, etc. (Figure 4b). The sequence (in the representation from bottom to top) of the recorded tag index values (ordinate) of the transponder data shown corresponds in this illustration to the chronological order of the transponder signals first detected for the respective object. Thus, the temporal (and thus also spatial) would result from this initial data as the order of the day indexes: day index 3, day index 4, day index 5, day index 6, etc. From the time-weighted evaluation However, time data 405, 410, 415, 420 result in a different time sequence, namely: tag index 3, tag index 5, tag index 4, tag index 6, ie an interchange of the order of the two objects with the tag indexes 4 and 5.
    FIG. 5 shows an exemplary embodiment of a device according to the invention for determining the spatial or temporal sequence of objects by means of transponder technology on the basis of a combined block / flow diagram. By means of a read-out module 510, a readout of acquired transponder data and a described conversion into corresponding floating point time data takes place. The reading takes place between a lower and upper time limit shown in FIG. 3a. From the resulting time data, a tag list of this time data is created by means of a first tag processing module 515, resulting in a data record shown in FIG. 3a.
    权利要求:
    Claims (10)
    [1]
    The tags are read out by means of a per se conventional shift register technology sequentially from a jewei-time (not shown here) shift register. Originally acquired transponder data from newly read tags are stored in the shift register and there, together with an EPC no. (EPC = "Electronic Product Code" or internationally valid product labeling) listed and summarized with the corresponding time values. In block / step 520, Ml N / MAX values are formed and all tags detected so far are checked with their respective timestamps to see if they are within the set time limits. For within-range tags, similar to block / step 515, a corresponding tag list is created by a second processing module 525. In block / step 535, for each EPC no. the time values buffered in a memory module 530 are totaled and divided by the number n time values. As a result, a single value of a mean transit time of the respective object, i. E. a timewise weighted baseline, in the form of a 1D array for all tags. Thereafter, on the basis of the mentioned average cycle times, a sorting takes place by means of a corresponding submodule ("Sort 1 D array") 536. In block / step 545, the average cycle time determined in the manner described and the EPC index are separated from one another , Thereafter, the representation 540 of a list of the real resulting order of the objects takes place. In block / step 550, each object is again assigned a named EPC code on the basis of the tag index, which is stored in the respective RFID tag of the object. The result is a list 555 of the first readout of the transponder data. claims
    A method for determining the order of at least two mobile objects (110, 115) by means of a transponder system comprising at least one RFID transponder (100) with a transmitting unit and with a receiving unit and with RFIDs respectively arranged on the moving objects (110, 115) Tags (130, 135), the transmitting receiving unit having a detection area (105) for detecting the RFID tags, characterized in that in the detection area of the at least one transponder at least two RFID detections are performed (205) and based on the the at least two RFID acquisitions (205) resulting detection data on the spatial and / or temporal order of the at least two objects (110,115) is closed (220, 225, 235, 240).
    [2]
    2. The method according to claim 1, characterized in that from the resulting acquisition data for each of the at least two objects (110, 115) by temporal weighting on the spatial and / or temporal order of the at least two objects (110, 115) is closed ( 220, 225, 235, 240).
    [3]
    3. The method according to claim 2, characterized in that the time weighting by totaling or by integrating the detection data for each of the at least two objects (110,115) and then dividing the accumulated or integrated detection data by the respective number of detection data for the respective object ( 110, 115) takes place (220).
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that by evaluating temporal detection data of the at least two RFID detections (205) of an object (110, 115) a value of an averaged or weighted transit time of the respective object ( 110, 115) is determined (225).
    [5]
    5. The method according to claim 4, characterized in that on the basis of the determined (225) transit time of the at least two objects, the at least two objects are time-sorted and thereby closed to the spatial and / or temporal order of the objects (235, 240).
    [6]
    6. The method according to any one of the preceding claims, characterized in that the RFID detections (205) are performed (215) until an RFID detection (205) no changes in the moving objects are detected more.
    [7]
    7. The method according to claim 6, characterized in that a change is assumed when an already detected object (110) has already left the detection area (105) again and / or another object (115) has entered the detection area (105) is.
    [8]
    8. The method according to any one of the preceding claims, characterized in that the detected and time-weighted data are filtered based on a plausibility check.
    [9]
    9. Device for determining the order of at least two movable objects (110, 115) by means of a transponder system which has at least one RFID transponder (100) with a transmitting unit and with a receiving unit and with movable objects (110, 115) each arranged RFID tags (130, 135), wherein the transmitting / receiving unit has a detection area (105) for detecting the RFID tags, marked by a read-out module (510) for reading by means of the at least one RFID transponder (100) detected transponder data and for conversion into corresponding floating point time data, at least one first processing module (515, 525) for generating at least one list of time data detected RFID tags, at least one second processing module (535) for accumulating or integrating the time data of captured RFID tags and for dividing the resulting sum or integral value by the number of detected RFID tags r forming a mean transit time of the at least two movable objects (110, 115), and an at least third processing module (536) for sorting the at least two average cycle times and for determining the order of the at least two moving objects (110, 115).
    [10]
    10. Device according to claim 9, characterized by a shift register, in which the detected transponder data newly read RFID tags are stored and there, together with an internationally valid. Product identification, and be cached with the flow times formed.
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    WO2010015266A1|2008-08-06|2010-02-11|Siemens Aktiengesellschaft|Sequence recognition of rfid transponders|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102016122682.3A|DE102016122682A1|2016-11-24|2016-11-24|Method and device for determining the order of objects by means of transponder technology|
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