EP2965042A1 - Procédé permettant de faire fonctionner un système de détection, système de détection et signal de mesure - Google Patents

Procédé permettant de faire fonctionner un système de détection, système de détection et signal de mesure

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Publication number
EP2965042A1
EP2965042A1 EP14708258.0A EP14708258A EP2965042A1 EP 2965042 A1 EP2965042 A1 EP 2965042A1 EP 14708258 A EP14708258 A EP 14708258A EP 2965042 A1 EP2965042 A1 EP 2965042A1
Authority
EP
European Patent Office
Prior art keywords
signals
signal
coefficient
measured value
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14708258.0A
Other languages
German (de)
English (en)
Inventor
Thomas Burkhardt
Ralph Bauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Balluff GmbH
Original Assignee
Balluff GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Balluff GmbH filed Critical Balluff GmbH
Publication of EP2965042A1 publication Critical patent/EP2965042A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L13/00—Electric propulsion for monorail vehicles, suspension vehicles or rack railways; Magnetic suspension or levitation for vehicles
    • B60L13/04—Magnetic suspension or levitation for vehicles
    • B60L13/06—Means to sense or control vehicle position or attitude with respect to railway
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/26—Rail vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields

Definitions

  • the invention relates to a method for operating a sensor system having at least one sensor unit.
  • the invention further relates to a sensor system. Furthermore, the invention relates to a measurement signal of a sensor system.
  • a magnetostrictive displacement measuring method for determining a position of a magnet in which the magnet along a waveguide is movable, in which an excitation pulse is generated and passed through the waveguide to the magnet, in which a torsion wave in the waveguide arises when the excitation pulse reaches the magnet, in which a response pulse is generated in response to the torsion wave, and in which the position of the magnet in response to the excitation pulse and the response pulse is determined.
  • a plurality of positions and excitation pulse correction values are associated with each other, and depending on the detected position of the magnet and the excitation pulse correction value associated with the table, the duration of the next excitation pulse is changed.
  • a magnetostrictive displacement meter with a pulse generator for generating electrical pulses is known.
  • a source fixed with respect to a transducer and cooperating with a magnetostrictive element is provided for generating sound pulses serving as reference pulses.
  • a system for determining the anchoring state of implanted endoprostheses is known from DE 10 2006 051 032 A1, in which a sensor suitable for measuring vibrations and a transponder unit for the wireless transmission of vibration measurement signals and for inductive electrical energy transmission are present on the endoprosthesis.
  • a communication interface for a path measuring device is known, which can be coupled between the path measuring device and a control device.
  • a sensor device which has a sensor element for generating an output signal in response to the measurement of a physical quantity.
  • a Wegmessvorraum comprising a sensor, a housing, a first board, a second board and a third board, which are arranged in the housing and circuit carrier, wherein the second board and the third Board each across the first board are oriented, the second board and the third board are connected via a first connector means and the combination of the second board and the third board is connected to the first board via a second connector means.
  • a distance sensor device in which a distance determination based on a transit time measurement of signals, comprising a transmitting device, a receiving device which provides received signals, an amplifier device for receiving signals, a control device which is signal-effectively connected to the amplifier device and this drives by means of actuating signals to the
  • Amplitude of amplified received signals to regulate An actuating signal evaluation device is provided which is signal-effectively coupled to the control device and which control signals are provided for evaluation.
  • the control loop has a connection via which control signals can be coupled out and the control signal evaluation device can be provided.
  • a magnetostrictive Wegaufêt- device for detecting the path of a position sensor comprising a sensor device with a extending in a longitudinal direction sensor to which the position sensor couples without contact.
  • An integrated acceleration sensor is provided for determining the acceleration of the position sensor.
  • a Wegmessvorraum comprising at least a first measuring section and a second measuring section, each having an extension of a longitudinal direction and are aligned parallel to each other at least in a measuring range. Furthermore, at least one position transmitter is provided, which couples to the measuring sections without contact, and a measuring section holder is provided which extends in the measuring area and has recesses in each of which a measuring section is arranged.
  • an inductive measuring device for position detection consisting of a coil structure and a material measure with at least one division of variable reluctance or conductivity. The coil structure is manufactured in multilayer design as a combination of coils with contours in the form of quasi-closed turns.
  • EBU Time-And-Control Code FOR TELEVISION TAPE RECORDINGS Tech 3097-E, 3rd Edition, April 1982 describes a format and a modulation method for a digital code recorded on a longitudinal track, which is used for Timing purposes and control purposes on televisions and associated audio tape machines.
  • the invention has for its object to provide a method for operating a sensor system with at least one sensor unit, which provides signals that has a high user factor for an operator.
  • the signals comprise primary measured value signals, which measured values are the sensor unit and are generated from measured values of the sensor unit, and that the signals comprise coefficients that characterize the acquisition of the measured value.
  • the primary measurement signals characterize the physical quantities measured via the at least one sensor unit.
  • the coefficients characterize how "critical” the determination of these measures was, for example, how much "reserve” or "safety” was present in the measurement.
  • the coefficient design provides qualitative and quantitative information about the reliability of the measured values. If appropriate, the sensor system can also be adapted via a feedback loop, for example, in order to obtain a higher quality.
  • the primary measured value signals are electrical signals which are measured values of one or more physical quantities or are generated from these.
  • the coefficients which are contained in the coefficient signals characterize, in particular, what reserve and / or safety and / or quality is present during the acquisition of the measured value or how critical the determination is. For example, measured values can be obtained at different signal-to-noise ratios. The coefficients can be used to characterize the signal-to-noise ratio. If, for example, this ratio is very small, then the measured values obtained are correspondingly more "critical".
  • the measured value signals and the reference value signals may be transmitted connected to one another and, in particular, to be transmitted on one channel.
  • the reference signals may be modulated onto the primary measurement signals or they may be attached serially.
  • the combination of primary measured value signals and incremental signals in the emitted signals is carried out in such a way that a backward compatibility for the method of "pure" (without coefficients) measured value transmission is present, so that, for example, in a higher-order
  • Control is adjustable, whether the feedback signals are used or not.
  • the feedback signals are transmitted continuously and, in particular, transmitted at the same data rates as the primary measured value signals. This makes it possible, for example, to realize regular monitoring.
  • the incremental signals can be transmitted at a lower data rate than the measured value signals, and in particular for certain events such as commissioning, decommissioning or service calls of the sensor system. This allows a corresponding check to be realized.
  • the coefficient signals and the primary measured value signals are transmitted in an analog manner and, in particular, the value signals are modulated onto the primary measured value signals. It is also possible that the primary measurement signals and the feedback signals are transmitted serially digitally. As a result, for example, a backward compatibility can be achieved in a simple manner. In particular, the coefficient signals are added in chronological order to the primary measured value signals.
  • a primary measured value signal is transmitted as a digital datum with a plurality of data bits, wherein in particular the individual databits are requested and output with respective clock pulses. This makes it easy to attach a coefficient signal as a digital datum.
  • a number of the requested and output data bits is defined by clock pulses of a controller.
  • a controller can decide, for example, by the number of clock pulses, whether it wishes to receive or evaluate the additional information contained in the coefficient signals. It is then possible to generate signal chains with feedback signals and to select whether the feedback signals are to be evaluated or not via the controller.
  • a coefficient signal is then appended as a digital datum with data bits to the date of the associated primary measured value signal, in particular in terms of time. This results in a total signal which includes as components the date of the primary measured value signal and the date of the reference signal. For example, via a corresponding timing, a higher-level control can then decide whether the feedback signals are to be evaluated or ignored.
  • a number of associated clock periods of the primary measured value signal with n data bits with appended coefficient signal with m data bits is included n + m.
  • a higher-level control can then decide by appropriate clocking with n clock periods whether only the primary measured value signal is used or with n + m periods select whether the coefficient is also used. Furthermore, it is easily possible via appropriate timing in a higher-level control to separate the primary measured value signal from the coefficient signal.
  • the datum of the measured value signal and / or the datum of the reference signal contains one or more additional bits in addition to the actual measured value information and component information and in particular comprises one or more error bits and / or warning bits and / or check bits or also start bits.
  • CRC bits may be provided on a measurement signal datum and CRC bits are then also appended to the score signal datum.
  • CRC bits form a check value to detect errors in transmission or storage.
  • Backward compatibility results if appropriate CRC bits are appended to a date consisting of the original date, the CRC for this, and the score signal date. As a result, the overall signal ends with CRC bits. This "end" CRC is determined according to the same algorithm as the CRC for the original date.
  • the primary measured value signals and the reference signals are in accordance with an SSI interface (SSI protocol) or BiSS-C interface
  • primary measurement signals are transmitted as analog or digital increments.
  • such an incremental transmission is provided in the case of displacement measuring systems with a magnetically coded measuring body.
  • Corresponding (additional) increments can be used to transmit reference signals.
  • coefficient signals are transmitted as increments with a time interval which is smaller than the time interval between increments of the primary measurement signal.
  • the corresponding reference signal can be transmitted.
  • a superordinate (evaluating) control if a coefficient signal is not evaluated specifically, it means at most an increased noise.
  • a transmission of the coefficient signals is such that a higher-level control can decide whether it evaluates the coefficients signals or not. This results in a backward compatibility. For example, it can be decided over a number of clock periods whether or not to evaluate the reference signals.
  • a signal chain with primary measured value signals and coefficient signals is formed in such a way that it is possible to select whether coefficients are read out or not. This results in a downward compatibility. For example, in a serial digital transmission, whether to read out coefficients by sending more clock pulses.
  • BiSS-C transmission does not send any more clock pulses after a first CRC
  • the system behaves like a standard BiSS-C interface. It can thus be realized in a simple way downward compatibility; if further clock pulses are sent, one obtains the coefficient and the CRC over the entire data set. For example, in incremental interfaces additional pulses are inserted, which are interpreted by a standard controller only as noise. These additional pulses can be evaluated and interpreted and from these coefficients can be obtained. For example, in an analog data transmission, the coefficient is superimposed on the useful signal. The coefficients can be ignored by a standard controller. An adapted controller can pay attention to the superimposed factor signal and evaluate and interpret it accordingly.
  • coefficient signals on the sensor system are determined without additional monitoring sensors and, in particular, one or more sensors of the at least one sensor unit are used for the determination of coefficients. As a result, the determination of the coefficient can be realized in a simple manner.
  • the time duration between two specific zero crossings of an analog signal is measured as the primary measured value signal.
  • a maximum signal height between the zero crossings then results in an advantageous manner directly or indirectly the coefficient.
  • Such a determination is provided, for example, in magnetostrictive displacement measuring systems. For example, if the maximum signal level is very low, then a poor signal-to-noise ratio is present and the determination of the time duration is "critical", that is, in particular, there is no high measurement inaccuracy.
  • a measured value detection takes place from a plurality of signals of the at least one sensor unit. For example, by linking corresponding signals and coefficients can then be determined.
  • a digital second sensor signal is high and in this case, a measurement signal is generated in particular as the falling edge of a digital signal.
  • a measurement signal is generated in particular as the falling edge of a digital signal.
  • a coefficient is generated from the length of the second sensor signal to high and its position to the zero crossing. To some extent, the phase relationship between the digital second sensor signal and the analog first sensor signal is checked.
  • a position value is derived from a voltage signal, and an amplitude of the voltage signal forms a coefficient signal, wherein in particular the amplitude is determined by setting an automatic gain control circuit. From this setting, for example, a coefficient signal can then be generated directly.
  • a coefficient value signal is determined from an amplitude or an amplitude ratio and / or a phase or phase ratio of magnetic sensor signals.
  • a sensor system which comprises at least one sensor unit which provides measured values for primary measurement value signals, and a coefficient determination unit which generates reference value signals which characterize the measurement value acquisition.
  • the sensor system according to the invention has the advantages already explained in connection with the method according to the invention.
  • the method according to the invention can be carried out on the sensor system according to the invention.
  • a signal generating unit which connects reference signals with primary measured value signals.
  • feedback signals can be transmitted assigned to the primary measurement signals.
  • the coefficient determination unit generates the feedback signals without additional monitoring sensors.
  • a measurement signal which comprises a primary measured value signal and a coefficient signal which characterizes the acquisition of the measured value.
  • the coefficient signal is added in time to the primary measured value signal, the primary measured value signal in particular being transmitted serially, and a total serial signal is formed.
  • a modulation of analog signals is possible.
  • the measurement signal according to the invention has advantages already explained in connection with the method according to the invention and the sensor system according to the invention.
  • the primary measurement signal is a digital serial signal and the feedback signal is attached as a digital datum to the primary measurement signal as a digital datum (serial).
  • FIG. 1 shows a schematic representation of a sensor system, which provides coefficient signals, with a control unit of a higher-level control;
  • FIG. an embodiment of a serial signal with measured value signal and appended coefficient signal; an embodiment of a CRC-secured signal with appended coefficient signal;
  • FIG. 4 shows an example of an incremental measured value signal (FIGS
  • FIG. 5 (a), (b) shows an example of a measured variable under different conditions Umax (FIGS. 5 (a) and (b));
  • An exemplary embodiment of a sensor system which is shown schematically in FIG. 1 and denoted there by 10, comprises a sensor device 12.
  • This sensor device 12 provides sensor signals at an output 14.
  • the sensor device 12 has a sensor unit 16.
  • This sensor unit 16 is arranged in particular in a housing 18.
  • the housing 18 is preferably closed.
  • the sensor unit 16 which comprises one or more sensitive elements, measures physical quantities. These represent the actual measured values. The measured values, if they are not already electrical quantities, are converted into electrical quantities in a converter unit 20.
  • the sensor device 12 further comprises a coefficient determination unit 22.
  • the coefficient value determination unit 22 determines a coefficient associated with one or more measured values, which characterizes the safety and / or quality of measured value acquisition itself. In particular, a coefficient characterizes a reserve or safety in the acquisition of the measured value.
  • the coefficient determination unit 22 is designed such that no additional monitoring sensor is necessary for determining the coefficient.
  • the coefficient determination unit 22 itself acquires measurement signals of the sensor unit 16 and / or detects data which is provided by the converter unit 20.
  • the sensor device 12 comprises, for example, an amplifier 24 which amplifies the measured value signals and thereby provides primary measured value signals which are usable signals.
  • an amplifier 24 which amplifies the measured value signals and thereby provides primary measured value signals which are usable signals.
  • the combination of primary measurement signals and slope signals is amplified.
  • gain signals and primary measured value signals it is also possible for gain signals and primary measured value signals to be amplified separately.
  • the sensor device 12 has an interface 26. This interface 26 is connected to the output 14. At the output 14, single-channel or multi-channel primary measured value signals and associated reference signals are provided.
  • the sensor system 10 comprises a higher-level control unit 28.
  • the control unit records the signals of the sensor unit 12, which are composed of the primary measured value signals and the coefficient signals and are provided at the output 14.
  • the control unit 28 has an adapted interface 30 for this purpose.
  • Subordinate to this interface 30 is an evaluation unit 32.
  • the evaluation unit 32 separates in particular the primary measured value signals from the coefficient signals.
  • a first connection 34 and a second connection 36 are provided.
  • Primary measured value signals are provided or used at the first terminal 34 via a corresponding interface, and at the second terminal 36, coefficient signals are provided via a corresponding interface.
  • the separation between the measured value and the coefficient does not take place in a separate control unit but within the control.
  • coefficient signals in the sensor device 12 are used directly (without external coupling-out) for adaptation.
  • the sensor device 12 provides a signal in which a coefficient signal 40 is appended to a primary measured value signal.
  • a digital serial transmission which is single-channel.
  • the primary measurement signal 42 is a digital datum which is composed of a plurality of data bits.
  • the data bits include measured value data bits 44 MSB (Most Significant Bit) to LSB (Least Significant Bit).
  • overhead bits such as one or more errorbits 46 and one or more warning bits 48 are provided.
  • the date of the primary measurement signal 42 is transmitted between a time tl and t2 and has n bits of data including any overhead such as errorbits 46 and warning bits 48.
  • Each individual data bit is output with a respective clock pulse 50 and, for example, a rising edge of such a clock pulse.
  • n data bits of the date of the primary measured value signal 42 n clock periods are therefore provided.
  • the coefficient signal 40 is a data with m data bits 52 between the data bit MSB (Most Significant Bit) and LSB (Least Significant Bit). These data bits 52 of the coefficient signal 40 are transmitted between the time t2 to t3. The date of the coefficient signal 40 immediately follows the date of the primary measurement signal 42.
  • the data bits 52 of the coefficient signal 40 are output at corresponding clock pulses 50.
  • the total signal which is composed of the primary measured value signal 42 and the attached coefficient signal 40, comprises n + m data bits.
  • n + m clock periods 50 are necessary.
  • the total signal is transmitted between time t1 and t3.
  • the time t3 is followed by a pause of the time tm.
  • the data transmission of the signal with the primary measured value signal 42 and attached coefficient signal 40 is "downward compatible".
  • Controller 28 may decide whether or not to evaluate the coefficient signals 40; if only n clock pulses 50 are evaluated following the start upon reception, then only the primary measured value signal 42 without added coefficient signal 40 is evaluated. If n + m clock pulses are used in the reception, then the coefficient signal 40 can also be evaluated.
  • the signals are also transmitted serially digitally, the signal transmission according to the
  • BiSS-C protocol takes place.
  • the primary measured value is transmitted as a digital datum 54 as of time t2.
  • this digital datum 54 finally includes an errorbit 56 and a warning bit 58.
  • This digital datum 54 comprises n data bits.
  • the transmission at the time t2 takes place after a start bit 60 and a CDS 62 (Control Data Slave).
  • the date 54 which is or contains the primary measured value signal, is followed by a CRC datum 64 with q bits.
  • the CRC Cyclic
  • Redundancy Check contains a check value for the data; these are the data of the primary measured value signal.
  • the CRC 64 is transmitted between times t3 and t4. At time t4, the transmission could be terminated; it is then a "normal" BISS-C transmission. From time t4, if further clock pulses are transmitted, a date 66 for the coefficient signal is appended to the data 54 with the CRC 64. This comprises m bits and is transmitted between t4 and t5. In turn, directly attached to the datum 66 is a CRC 68, which is transmitted between the times t5 and t6.
  • the CRC 68 corresponds to the CRC 64, but now over all bits between the times t2 and t5. It contains data, error, warning bits, the original CRC (over t2 to t3), and coefficient bits over this period. This completes the overall signal with the CRC 68.
  • a higher-level control for example with a control unit 28, can then read out the CRC of the total signal at the end of the overall signal, as in the case where no feedback signals are appended. This results in a backward compatibility.
  • the total signal is transmitted with n + m + 2q clock periods.
  • signals are transmitted digitally incrementally. This is explained using an example in which a signal generator moves in the positive direction at a constant speed.
  • the sensor unit provides signals A ( Figure 4 (a)) and B ( Figure 4 (b)).
  • the "main signals" are pulses 70 and 72, respectively.
  • Position signals of a position transmitter are transmitted as positive or negative increments. For example, if edges of a signal 70 are in front of edges of a signal 72, then this is counted as a positive increment. In the opposite case, it is counted as a negative increment.
  • the result is a basic stepping (when moving in a positive direction at a constant speed), as shown in Figure 4 (c).
  • the signal 70 is between the instant t1 and t3
  • a signal and 72 (B signal) superimposed on a corresponding short increment The evaluation of the A signals and the B signals means a short negative and then a positive increment.
  • the superposition of the main signals 70, 72 is effected by a negative increment. Between times t3 and t4, when the signal 70 is low, negative and positive increments are superimposed twice. Due to the frequency and / or the sequence of positive and negative "short" edges 74, which are evaluated as increments, the coefficient can be coded, that is, a coefficient signal can be generated.
  • Short increments are inserted as short position changes in the main signals.
  • the coefficient can be coded.
  • these short position changes are like position noise.
  • the primary measured value signal and its associated coefficient signal can also be transmitted analogously via (at least) two channels, for example.
  • the primary measured value signal and the associated coefficient signal are transmitted analogously on a channel.
  • the coefficient signal is modulated onto the primary measured value signal, for example via amplitude modulation.
  • position signals are transmitted as four sinusoidal and cosine voltages as differential signals.
  • L is a pole length or pole pair length.
  • Usimax and U COmax are voltage amplitudes. It is advantageous if they are as large as possible. Furthermore, the signals contain DC components U S io
  • Ucoo (x) Uco . ioo - (1-x) * hub (7) stroke is a half maximum offset difference, which is still tolerated by a higher-level controller such as the control unit 28.
  • the higher the difference of the DC components, the more critical the signal acquisition. If, in this example, the coefficient is maximally x 1, then the DC component is the same for both signal pairs.
  • the difference of the DC components U S io and U co o is modulated with a specific frequency which is proportional to the coefficient.
  • the two DC components can also be changed with the same frequency, but different phase position. If, for example, the DC components then change in phase, the primary measured value signal with maximum coefficient was determined. A minimum coefficient results, for example, for a 180 ° phase difference.
  • This method is also backwards compatible with a standard sine cosine interface.
  • the primary measured value signals are transmitted at a higher data rate than the reference value signals.
  • coefficient signals are only transmitted on certain occasions such as commissioning of the sensor system, decommissioning of the sensor system, service calls the sensor system, etc.
  • the coefficients which are contained in the coefficient signals characterize a safety or reserve and thus also a quality of a measured value which is contained in the measured value signal. They characterize how "critical" the determination of the measured value was.
  • Such information can be used, for example, if a plurality of sensor units 16 are present in order to use only the primary measured value signals of the sensor unit which has the highest coefficient for the evaluation or use.
  • the "best" measurement can be used.
  • the coefficient assigned to the primary measured value signal is a measure of the "quality" of the measurement. In principle, it can be monitored via the coefficient that the primary measured value signals are "usable” with respect to the measured values. If, for example, the coefficient falls below a threshold, then a warning signal can be output, which indicates that a reliability limit of the measured values has been undershot.
  • the coefficient signals can be obtained in different ways with different sensor systems.
  • the method of extraction depends on the acquisition of the measured value.
  • a measurement signal is obtained from an analog signal 76 having zero crossings by determining a distance T (such as a time interval) between two particular zero crossings 78a and 78b.
  • the useful signal (the analog signal 76) has a certain maximum signal height Umax between the two zero crossings 78a, 78b. This maximum is a measure of the "Safety" of the measurement and can be used as a factor. For example, the smaller Umax, the worse the signal-to-noise ratio is, and the more critical is the measurement of T (such as a time measurement). The larger Umax, the safer the time measurement T. If, for example Umax is smaller and disappears in the noise, no time measurement is possible.
  • Umax can therefore be used directly as a coefficient, and the corresponding coefficient signal can be generated by the coefficient determination unit 22 from this.
  • the measured value recognition comprises a plurality of sensor signals U 1 (s) and U 2 (s) (FIGS. 6 (a) and (b)).
  • the useful signal U l (s) is an analog signal and the useful signal U2 (s) is a digital signal.
  • a measured value recognition or extraction takes place, for example, when the useful signal Ul (s) has a rising zero crossing 80 and at the same time the useful signal U2 (s) is at high 82.
  • a resulting primary measured value signal is then generated by (s) (FIG. 6 (c)), which has a falling edge 84.
  • the quality of the primary measured value signal by (s) is defined by the locations sl and s2 of the signal 86, which stands at high 82. It is desirable that sl and s2 are as large as possible and have as similar a value as possible. However, they must not be so large that they coincide with further rising flanks of U l (s).
  • FIGS. 6 (d), (e) and (f) show different case designs for U2 (s). These signals do not correspond to the situation shown in FIGS. 6 (a) and (b).
  • the signal U2a (s) according to FIG. 6 (d) and the signal U2b (s) according to FIG. 6 (e) show cases in which one is just still valid signal Um (s) results. In the case of the signal U2c (s) according to FIG. 6 (f), this comes "too late” and Um (s) is no longer output correctly.
  • a concrete embodiment of a sensor system is a magnetostrictive displacement measuring system. See, for example, T. Burkhardt, A. Feinäugle, S. Fericean, A. Forkl, "Linear displacement and distance sensors", Verlag Moderne Industrie, Kunststoff, 2004.
  • the magnetostrictive Wegmesssystem is the term of a torsion wave, which due to a reversed magnetostrictive effect was generated, measured.
  • the position sensor is a magnet.
  • a position value for the position of the magnet is derived from a voltage signal. The amplitude of the voltage signal changes by various factors such as temperature, the distance of the position sensor to a waveguide, a lateral displacement of the position sensor to the waveguide, the position, etc. A correction of these factors is for example by an automatic gain control
  • AGC adaptive control circuit realized;
  • the coefficient can be formed, for example, from the amplitude of the voltage signal.
  • a significant value can be determined by a gain setting of the automatic gain control circuit.
  • the primary measurement value is obtained from the voltage signals as described above with reference to FIG 5 and Umax is just determined by the setting of the automatic gain control circuit.
  • a sensor head with magnetic field sensors is guided without contact at a distance over a magnetically coded scale body.
  • the sensor head contains (at least) two magnetic field sensors, which are either the components of the Measure magnetic field vector in the direction of their sensitivity or the angle of the magnetic vector field to the direction of movement.
  • the counting of magnetic periods allows a statement about the distance traveled.
  • the magnetic field sensors are arranged at intervals of a quarter or three-quarter magnetic field period relative to one another in the sensor head. This results in a phase difference of 90 ° (or 270 °).
  • the corresponding magnetic field sensors are referred to as sinusoidal sensor and cosine sensor. See also the book quoted above.
  • an incremental displacement measuring system with magnetically coded scale body is obtained according to up to two output signals, which are a position (Weginkremente) and a reference signal.
  • a coefficient can be determined and from this a combination of the two values can be transmitted.
  • a position signal is derived, for example, by interpolation of the sensor signals of the sine sensor and the cosine sensor.
  • the amplitude is reduced by various factors such as the distance to the magnetically coded scale, a lateral offset, the temperature, etc. From the amplitude or the phase, the coefficient can be determined.
  • reference pulse this is determined from two magnetic sensors. These magnetic sensors have a defined distance. By changing the angle, the phase between the magnetic sensors changes. The evaluation becomes more critical. The reference signal is also dependent on angle.
  • the corresponding reference signal according to FIG. 6 (c) can be obtained with the abovementioned possibility for obtaining the coefficients.
  • a magnetically encoded displacement measuring system can also determine an absolute position if it is designed accordingly.
  • par- There are several magnetic sensors available. For example, by rotating a sensor head relative to the scale body, the mechanical conditions change and the absolute position determination becomes more critical. Also temperature, distance, lateral offset etc. have an influence.
  • the coefficient can also be derived from the corresponding signals of the magnetic field sensors, again referring to the statements relating to FIG. 6.
  • magnetic fields of a measuring body are measured by means of several sensors (for example 2 * 15).
  • sensors for example 2 * 15.
  • the magnetic fields visible to the sensors change.
  • the corresponding sensor which sees this magnetic field change, must switch.
  • the switching of the sensors should take place as simultaneously as possible and should also be in the middle of a region in which the switching of a
  • the simultaneity and the mean for the switching of the sensors in a corresponding sensor unit is a measure of the quality of the (primary) measuring signal. If the distance or incorrect positioning or orientation of a sensor head with such a sensor unit is too high relative to the measuring body, the center or simultaneity decreases and the signal generation becomes more critical. By the method described above, the coefficient of mean and simultaneity can be determined.
  • a measurement signal which contains a primary measured value signal which contains the measured values.
  • the measurement signal further comprises a coefficient signal which characterizes the acquisition of the measured values and in particular characterizes their safety or reserve.
  • coefficient signals are added to or superimposed on the primary measurement signals. This results in a corresponding signal train. With appropriate training of this signal can be decided by a higher-level control, whether the coefficient is used or not.
  • the coefficient value can be evaluated by a corresponding diagnostic tool in the control unit 28. If necessary, an adjustment of the sensor device 12 is possible if, for example, the coefficient is or becomes too low.
  • coefficients can be advantageously obtained and transmitted in sensor systems for the distance and distance measurement. Basically, however, it is possible to obtain and extract the coefficients in each sensor system.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L'invention concerne un procédé permettant de faire fonctionner un système de détection pourvu d'au moins une unité de détection, ce système fournissant des signaux. Selon ce procédé, les signaux comprennent des signaux de valeur de mesure primaires, lesquels sont des valeurs de mesure de l'unité de détection ou sont produits à partir de valeurs de mesure de l'unité de détection, et selon ce procédé, les signaux comprennent des signaux de coefficient, lesquels caractérisent l'obtention de la valeur de mesure.
EP14708258.0A 2013-03-08 2014-03-06 Procédé permettant de faire fonctionner un système de détection, système de détection et signal de mesure Withdrawn EP2965042A1 (fr)

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DE102013102323.1A DE102013102323A1 (de) 2013-03-08 2013-03-08 Verfahren zum Betreiben eines Sensorsystems, Sensorsystem und Messsignal
PCT/EP2014/054333 WO2014135632A1 (fr) 2013-03-08 2014-03-06 Procédé permettant de faire fonctionner un système de détection, système de détection et signal de mesure

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CN105122007B (zh) 2018-08-31
CN105122007A (zh) 2015-12-02
US20170003143A9 (en) 2017-01-05
WO2014135632A1 (fr) 2014-09-12
DE102013102323A1 (de) 2014-09-11
US9897463B2 (en) 2018-02-20

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