MEASURING DEVICE FOR PROCESS AUTOMATION IN THE INDUSTRIAL ENVIRONMENT

Abstract

A measuring device for process automation in an industrial environment is provided, the measuring device including: a first sensor device configured to detect a process variable; a position detection device configured to detect a position of the measuring device; a second sensor device configured to acquire environmental data; and a controller configured to analyze the acquired environmental data, determine, based on the analysis, whether or not a current position of the measuring device should be detected, and instruct the position detection device to detect the current position of the measuring device when the analysis of the environmental data has determined that the current position should be detected. A method for determining a position of a measuring device is also provided.

Claims

1.-15. (canceled)

16. A measuring device for process automation in an industrial environment, the measuring device comprising: a first sensor device configured to detect a process variable; a position detection device configured to detect a position of the measuring device; a second sensor device configured to acquire environmental data; and a controller configured to analyze the acquired environmental data, determine, based on the analysis, whether or not a current position of the measuring device should be detected, and instruct the position detection device to detect the current position of the measuring device when the analysis of the environmental data has determined that the current position should be detected.

17. The measuring device according to claim 16, wherein the position detection device is further configured to sense the current position of the measuring device only when analysis of the environmental data has indicated that the current position should be sensed.

18. The measuring device according to claim 16, further comprising a data memory configured to store the current position of the measuring device.

19. The measuring device according to claim 16, wherein the controller is further configured to instruct the position detection device to detect the current position of the measuring device only when analysis of the environmental data has indicated that the measuring device has been moved.

20. The measuring device according to claim 16, wherein the controller is further configured to instruct the position detection device to detect the current position of the measuring device only when analysis of the environmental data has indicated that the measuring device has been moved and is now stationary.

21. The measuring device according to claim 16, wherein the controller is further configured to detect a pattern of movement of the measuring device from the analysis of the environmental data.

22. The measuring device according to claim 16, further comprising: an energy storage device; and a switch configured to close a connection between the energy storage device and the position detection device.

23. The measuring device according to claim 16, wherein the second sensor device comprises an acceleration sensor, a position determination device by means of mobile radio signals, a compass, and/or a current meter.

24. The measuring device according to claim 16, wherein the measuring device is configured for level measurement.

25. The measuring device according to claim 16, wherein the measuring device is configured for pressure measurement.

26. The measuring device according to claim 16, wherein the measuring device is configured for flow measurement.

27. The measuring device according to claim 16, wherein the measuring device is configured to measure a process variable in a mobile container.

28. A method for determining a position of a measuring device, comprising steps of: capturing a process variable; acquiring environmental data from the measuring device; analyzing the acquired environmental data; determining, based on the analysis, whether or not a current position of the measuring device should be measured; and measuring the current position of the measuring device if the analysis of the environmental data has shown that the current position should be measured.

29. A nontransitory computer-readable storage medium comprising computer program instructions stored therein, which, when executed on a controller of a measuring device, instructs the measuring device to perform the steps of the method according to claim 28.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0035] FIG. 1 shows a container with a measuring device arranged therein.

[0036] FIG. 2 shows the structure of a measuring device according to an embodiment.

[0037] FIG. 3 shows a flow diagram of a process according to one embodiment.

[0038] FIG. 4 shows a flow diagram of a process according to a further embodiment.

[0039] FIG. 5 shows the structure of a measuring device according to a further embodiment.

DETAILED DESCRIPTION OF EMBODIMENTS

[0040] FIG. 1 shows an example of a so-called IBC 101, which is used to transport media. This weight-, volume- and cost-optimized design is particularly popular in the distribution and logistics industry, and makes it easy to supply customers with a wide variety of media. The IBC 101 usually consists of a pallet 102, a metal frame 103 and a container bladder 104, typically made of plastic, which contains the filling medium 105. The medium 105 can be introduced into the container 101 or into the container bladder 104 via a lid 106.

[0041] The measuring device 107 may be, for example, a level measuring device typically attached to an upper surface of the container bladder 104 and having a first sensor means that measures the distance to the product surface 105 using, for example, electromagnetic waves. The measuring device 107 may then provide the measurement result to the outside.

[0042] Furthermore, the measuring device 107 comprises a communication module for wireless communication (e.g. Narrowband IoT, LPWA (Low Power Wide Area) communication, Lora, Sigfox, MIOTY, LoRaWAN, Bluetooth). Further, the measurement device 107 comprises a position determination module (position acquisition device) and another sensor (second sensor device) whose data is used to decide whether to perform a position determination. Only if an evaluation logic (control device) detects that a position update is necessary, the position determination module is supplied with sufficient energy. The aim is to reduce the energy consumption of the position determination.

[0043] One aspect is the interaction between the control device, the position determination module and the second sensor device for detecting whether a position update is necessary. The position determination module (GP S/Galileo/Glonass/Beidou/Mobile phone network/Bluetooth/Indoor position determination) requires a lot of energy during operation and should therefore only be activated for a very short time. The sensor to detect if a position update is necessary or useful can be e.g. an acceleration sensor or a simple push button. The energy consumption of this sensor is significantly lower than the energy consumption of the module for position determination. Consequently, the invention reduces the overall energy consumption of the measuring device.

[0044] The energy supply of such measuring devices is usually not wired, as otherwise the flexibility would be severely impaired. Therefore, self-sufficient solutions by means of energy storage units are necessary to ensure the energy supply of the measuring device. This means that all components of the measuring device are supplied by at least one energy storage device. A form of energy harvesting, in which the energy storage is replenished by means of photovoltaics, for example, is also possible. Nevertheless, the requirement that each individual component of the measuring device consumes as little unnecessary energy as possible is of utmost relevance. Energy-intensive processes in particular, such as position determination, must therefore be reduced to a minimum.

[0045] From the above use case, which describes that a tank first remains in a storage location and after a certain time is transported to an extraction point, it quickly becomes apparent that the position determination of the measuring device is only required at exactly two locations. The first time a position update of the position data persistently stored in the gauge is necessary is when the tank with the gauge has reached its fixed storage location in the warehouse. After that, the position does not change for a longer period of time and the position determination can be deactivated to save energy.

[0046] A complete disconnection of the energy supply by means of a circuit, switch or transistor is possible, or also a solution in which the position determination module is set to an energy-saving state. The measuring device is set up in such a way that after a certain period of time it initiates a measured value acquisition, for example a level measurement, and makes the measured value (level) with the last stored position data known to a user via a radio module. This process can be repeated sequentially. The level measuring device continues to supply correct position data until the tank is moved again. In the meantime, the position determination module can remain deactivated. An update of the position is not necessary, since both the tank and the level measurement system remain stationary. Only when the tank has reached the tapping point in the example shown does a position update make sense. The control unit uses the sensor data (environmental data) from the second sensor device to detect whether a position update is necessary, ensures the power supply to the position determination module and updates the existing position data. A new measurement can then be initiated and the updated position data can be sent with the fill level of the tank via a radio module.

[0047] Whether a position determination is required during the transport of the tank and whether the measuring device then continuously updates its position data when transmitting via a radio module can, if necessary, be determined by the user himself and communicated to the measuring device via a parameterization interface or parameter interface.

[0048] According to a further embodiment, the transmission of the position data is also stopped during a movement of the tank. Alternatively, it can be provided that instead of the position data, a status signaling that the measuring device and the tank are being moved is transmitted via the radio module.

[0049] For the second sensor device, which collects environmental data that is then evaluated to decide whether a position update needs to be performed, various embodiments are possible that find their practical application individually or as a combination:

[0050] Pushbutton/Switch:

[0051] In the simplest case, the second sensor device is represented by a pushbutton or switch. The environmental data is then the pressure on the pushbutton, the closing of a contact by a finger or a tool, or a capacitance change in the case of a capacitive pushbutton. The pushbutton/switch must be operated manually as soon as the tank with the measuring device has reached its destination.

[0052] Accelerometer:

[0053] An acceleration sensor detects that the tank is moved with the meter. The acceleration sensor has a very low energy consumption. In addition, it is possible to provide the acceleration sensor with a neural network or other artificial intelligence in order to react only to certain movement patterns. A uniform movement that results in a change in position can thus be distinguished from a vibration that is not relevant. Also possible are simple forms of sensors that detect motion by, for example, a fine metal plate closing a contact.

[0054] It may be advantageous to perform the position update only when it has been detected that the tank has reached its destination. For example, after an acceleration during a waiting time, it can be observed whether a further acceleration does not follow. Only when it is ensured that the tank has reached a fixed location can the position update then be performed. The detection of movement patterns is also helpful here. In this way, it can be detected whether the tank is first moved and then set down.

[0055] Radio Cell Detection:

[0056] A sensor or communication module that detects the current radio cell of a mobile radio network or the reception strengths of various masts and concludes a change in position when the reception characteristics change, which is then verified via the position determination module.

[0057] Timer:

[0058] A timer that cyclically initiates a position update.

[0059] Compass:

[0060] A compass whose orientation is continuously detected and performs a position update when there is a change.

[0061] Current Meter at Energy Harvesting:

[0062] If the measuring device has devices for energy harvesting, a sensor can be used to evaluate whether there is currently surplus or at least sufficient energy available to perform a position update.

[0063] FIG. 2 shows the function of a measuring device according to one embodiment. A position module (position detection device) 201 for receiving position data 210 is supplied with energy from an energy storage device 204 (battery, capacitor) via a line 202. The line 202 includes a switching device 203 (mechanical switch, transistor, circuit) that can be used to disconnect the position module 201 from the energy supply or to supply it with energy. The switching device 203 can be influenced by a control line 205 with a control direction 206 (microcontroller, logic circuit). The control direction 206 or the microcontroller 206 can perform other functions. Links to the position module 201, to a radio module 207 and to a sensor for detecting filling levels 209 are shown in the figure. Analog or digital signals/data can be exchanged via the links. A further sensor 208 is connected to the control unit 206 itself, the data from which can be used to decide whether a position update is required, and a data storage device 210 for storing the position data and the measurement data.

[0064] For example, the control device 206 may first detect a fill level via the fill level sensor 209, then decide whether to power the position module 201 to request a position update from the position module 201 by evaluating the data from the sensor 208. Subsequently, all the gathered information is published via a radio module 207. The data broadcast 211 can then be received and analyzed by a user.

[0065] FIG. 3 shows the individual steps of a position update. In step 301, the position determination module is supplied with power. In step 302, the system waits until the position determination is complete. In step 303, the position data is transferred from the position determination module to the control device. In step 304, the control device persistently stores the position data. In step 305, the power supply to the position determination module is disconnected or the module itself is set to an idle state.

[0066] FIG. 4 shows the main program sequence of a level measuring system. In step 401, a level measurement is carried out. In step 402, the measured value of the level is transmitted via the radio module. In step 403, the stored position data of the last position update is transmitted via the radio module. In step 404, sensor data are acquired and evaluated (environmental data). In step 405, a check is made to determine whether a position update (FIG. 3) is necessary. The position update is then carried out in step 406.

[0067] It should be noted that a sequential program flow as in FIG. 4 is only one example. It is also possible that the sensor 208 triggers an interrupt, which then leads to the execution of the position update in parallel. It is also possible that the sensor, which may be located externally, has its own evaluation logic (e.g. an artificial neural network) for obtaining environmental data, which then informs the main evaluation logic via a single control line that a position update is required.

[0068] FIG. 5 shows a variation of FIG. 2, but the switching device 203 and the control line 205 are missing. The figure shows that there are also modules for position determination that can be set to an energy-saving state or even internally de-energized.

[0069] Supplementally, it should be noted that “comprising” and “having” do not exclude other elements or steps, and the indefinite articles “an” or “a” do not exclude a plurality. It should further be noted that features or steps that have been described with reference to any of the above embodiments may also be used in combination with other features or steps of other embodiments described above. Reference signs in the claims are not to be regarded as limitations.