DE3111807C2 - Point-like effective information transmission device with at least one response device and an interrogation device that is track-bound relative to this - Google Patents

Description

The invention relates to a punctiform < >> effective, radiation-bound information transmission device with at least one stationary Responding device and a mobile interrogation device that is track-bound relative to this, wherebyi a specific Information of a respective transponder encrypting transponder signal when moving past the Interrogation device causes a signal with an approximately bell-shaped profile in this, the maximum of which is achieved by halving the distance between the same threshold values of the rising or falling edge of the signal, which can be determined with a distance measuring device is localizable.

A device of this type is known from DE-OS 29 10 709. In addition to the actual transfer of information, the use of two receiving organs for an interrogator, which are influenced one after the other by a responder a measurement of the relative speed between the interrogator and the respective responder possible.

It is the object of the invention, with a device of the type mentioned at the outset, to quickly position an interrogation device with a receiving element to allow any one of several answering devices, in which both devices should face each other as closely as possible. This is, for example, when positioning units in Coking plants extremely advantageous (»SICARID identification system for process automation« Siemens-Zeitschrift 52 (1978), issue 4, pages 265 to 268).

This object is achieved according to the invention in that the distance for each of the transponders can be registered between the associated two threshold values in a memory and that the interrogation device upon reaching a predetermined direction of movement the threshold value with an ascending tendril of a response device to be controlled by half the associated stored distance in the specified Direction of movement can be moved further

A first advantageous embodiment of the invention is characterized in that in the passage each Responder the position measuring device with the reaching of the Schwellwertei with ascending tendril can be incremented from a basic position depending on the path and when the threshold value is reached at descending tendril can be reset to the basic position, for each transponder passed the determined path measurement result can be fed to the memory The distances are continuously updated so that possible long-term fluctuations caused by the operation, e.g. B. by Temperature influences, can be eliminated.

If when the threshold value of the rising edge is reached for an identified one to be controlled Responder whose specific distance between the threshold values is not registered in the memory it proves to be advantageous according to a further advantageous embodiment of the invention that switching means to recognize this state and to reverse the specified direction of movement after reaching the Threshold value of the descending tendril and for moving further in the opposite direction of movement by half the now registered specific Distance be provided. Rapid positioning is thus also made possible in this case.

In the event that the identification, an examination for Subject to delivery of a quality assessment, it proves to be advantageous that as a signal with approximately Bell-shaped course of the course of the quality assessment is provided. This eliminates the need for additional, facilities assessing the level.

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Ir ₁ this case he ^ in a particularly simple circuit arrangement in that the threshold values with a determined from the quality evaluation value for coinciding a sufficiently accurate identification of a response unit.

An embodiment of the invention is shown in the drawing and will be described in more detail below explained doing shows

F i g. I a schematic diagram and

F i g. 2 is a block diagram. ι ο

In the illustration according to FIG. 1 shows three stationary response devices AN 1 to AN3, which reflect a swept microwave signal of a track-guided mobile interrogation device AB in a frequency-selective manner according to information assigned to them in each case. The direction of movement of the interrogation device Aß is indicated in the illustration by a double arrow

In the form of a diagram, the quality of the readings, which follow one another at relatively short time intervals, is shown, ie the number η of the positions recognized as correct in an m-digit alphanumeric identifier Di, indicating the respective information of a response device AIV1, AN2 or AN3; Quality is determined by a code and identity check as well as by evaluating a control digit. It shows that via a path s that the quality of the readings is approximately bell-shaped to the center of the passage when a transponder ANi, AN2 or AN3 passes is indicated in each case by a dash-dotted line, runs

It is also possible to carry out quality assessment so that on reaching a number χ consecutive entirely correct readings the passage beginning criterion is triggered and after reaching a number y consecutive error-κ incorrect readings, the passage end criterion is given.

The block diagram according to FIG. 2 shows the interrogation device AB, which is connected to an evaluation circuit A These routes each detected by Abfragerät AB * o characteristic Zeicher to a memory S, provided that m of π sites (Fig. 1) right - optionally several times in succession - are present, and determines a passage Initially - and a passage end criterion. The passage start criterion is output when m of η positions have been clearly recognized. The passage end criterion is then given if fewer than m of the η digits are recognized. The output of the recognized identifiers to the memory 5 thus takes place only between a passage start and a passage end criterion. The further use of these criteria will be discussed in more detail below.

Via an input circuit E that of responder ANX, AN2 and AN3 is selected, with respect to the interrogator / 4 S to be positioned centrally.

With the aid of a comparison device Vi , the content of the memory Smi »is compared to the predetermined value of the input circuit E. Depending on the difference Δ of the comparison, which can provide information about the distance between the interrogator AB and the responders ANi, AN2 or AN3 , the speed of a motor M is controlled via a converter LJ Direction of rotation of this motor M can be set.

With the movement of the motor M , displacement pulses are generated which are sent to a counter Z. The path pulse can also be generated via a measuring wheel that is connected to a unit driven by the motor M

It is assumed that the counter Zsich is initially located in a basic position from this out it is with each passage initial criterion that is supplied thereto via a line Li, started and the distance pulses incremented until a passage end criterion on a line L 2 is present, this also causes a Resetting the Zin counter to its basic position.

Unless tin passage initial criterion occurs, and the comparison means Vl a ^ ientität (=) the memory content of the memory is 5 determines and the preset from the input circuit E value across an AND gate Ui the SPgespeicherte for this response unit in a memory number of distance pulses zwlichen Passageanfangskrilerium and passage end criterion forwarded to a comparator V2 This is connected to the counter Z and sends an output signal to an OR gate O until the number of distance pulses counted by the counter Z corresponds to half the number of distance pulses specified by the memory SP A signal logical "1" of the OR gate O causes the motor M to continue running slowly via the converter U

When an end-of-passage criterion appears, a signal triggered by this on a line L 3 updates the count of counter U for each most recently recognized response device in the memory SP , provided that the response device was a non-controllable response device. An AND element is required to implement this condition U3 provided.

If, when the memory SP is read out via the AND element Ui with the aid of a detector device D, it is determined that the number of path pulses between the passage start criterion and passage end criterion in the memory SP is unknown, the motor continues to run slowly via the OR element O on the one hand M and, on the other hand, a first input of an AND element i / 2 is prepared, as a result of which the motor M is reversed via the AND element U2 and the converter U with the following passage end criterion. However, since the initially unknown distance pulse number of the zi:! Eti.i recognized response device has now been detected, exact positioning can now take place with the aid of the comparison device V2 when driving back.

It is also possible to use the device according to FIG. 2 to be replaced by a process computer.

1 sheet of drawings

Claims (5)

Patent claims: 1. Point-like effective, radiated information transmission device with at least one stationary response device and a mobile interrogation device that is track-bound relative to this, with a response device signal encrypting the specific information of a respective response device when the interrogation device moves past it causes a signal with an approximately bell-shaped course, the maximum of which is caused by Halving the distance between the same threshold values of the ascending or descending edge of the signal, which can be determined with a displacement measuring device, is characterized in that the distance between the two associated threshold values is stored in a memory for the response devices (ANX, AN2, AN3) (SP) can be registered, and that with a given direction of movement the interrogation device (AB) from reaching the threshold value with an ascending tendril of a response device (ANi, AN2, AN 3) to be controlled by half the associated stored distance i n can be moved further in the specified direction of movement 2. Device according to claim 1, characterized in that during the passage of each response device (AN 1, ANZ AN3) the path measuring device (counter Z) can be advanced depending on the path from a basic position when the threshold value is reached in ascending tendrils and when the threshold value is reached can be set back to the basic position when the tendril is descending, whereby the determined path measurement result can be fed to the memory (SP) for each transponder (AN 1, AN 2, AN3) passed. 3. Device according to claim 1 or 2, wherein when the threshold value is reached, the rising In the case of an identified transponder to be controlled, tendril its specific distance between the threshold values is not registered in the memory, characterized in that switching means (detector D, OR element O, AND element i / 2, converter U) are provided for recognizing this state and for reversing the specified direction of movement after reaching the threshold value of the falling edge and for moving further in the opposite direction of movement by half the now registered specific distance . 4. Device according to one of the preceding so Claims, whereby the identification is subject to a test for the delivery of a quality assessment, characterized in that the course is used as a signal with an approximately bell-shaped course the quality assessment is provided. 5. Device according to claim 4, characterized in that the threshold values coincide with a value determined from the quality assessment for a sufficiently precise identification of a response device (AN 1, AN 2, AN 3) . «>