WO2011057904A1 - Système de détection, appareil de détection et appareil de diagnostic - Google Patents

Système de détection, appareil de détection et appareil de diagnostic Download PDF

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Publication number
WO2011057904A1
WO2011057904A1 PCT/EP2010/066482 EP2010066482W WO2011057904A1 WO 2011057904 A1 WO2011057904 A1 WO 2011057904A1 EP 2010066482 W EP2010066482 W EP 2010066482W WO 2011057904 A1 WO2011057904 A1 WO 2011057904A1
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WO
WIPO (PCT)
Prior art keywords
sensor
diagnostic
sensor system
pulses
pulse
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Application number
PCT/EP2010/066482
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German (de)
English (en)
Inventor
Peter Dolderer
Sorin Fericean
Stefan Hornung
Martin Osterfeld
Jürgen Gutekunst
Peter Thomas
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.)
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Publication date
Application filed by Balluff Gmbh filed Critical Balluff Gmbh
Publication of WO2011057904A1 publication Critical patent/WO2011057904A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
    • G01R31/2829—Testing of circuits in sensor or actuator systems
    • 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
    • G01D3/08—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown

Definitions

  • the invention relates to a sensor system comprising at least one sensor device, which comprises at least one sensor connection and power supply connections, and at least one diagnostic device to which one or more sensor devices can be connected, whereby diagnostic signals of the connected sensor device (s) can be provided by the at least one diagnostic device and / or or are evaluable.
  • the invention further relates to a sensor device. Furthermore, the invention relates to a diagnostic device. Sensor devices such as inductive, optical, magnetic field-sensitive, capacitive, magnetostrictive, microwave, ultrasonic sensor devices, etc. are subject to internal and external influences that may influence the measurement result. It is desirable to perform diagnostic operations on a sensor device in order to be able to detect malfunctions or to be able to detect potential malfunctions in good time.
  • Sensor devices such as inductive, optical, magnetic field-sensitive, capacitive, magnetostrictive, microwave, ultrasonic sensor devices, etc. are subject to internal and external influences that may influence the measurement result. It is desirable to perform diagnostic operations on a sensor device in order to be able to detect malfunctions or to be able to detect potential malfunctions in good time.
  • a sensor device has to provide a corresponding diagnostic signal, which is evaluated or provided by a diagnostic device so that it can be processed by a higher-level evaluation unit.
  • a diagnostic information may be the display of a fault or diagnostic information may also contain details, for example, in terms of the nature and / or extent of the disorder.
  • DE 196 13 884 A1 discloses a method for transmitting information between the measuring system of a position-measuring device and an evaluation and supply unit connected thereto via at least one supply line, wherein the measuring system comprises a scanning unit, via which position-dependent, analog scanning signals are generated and a Transmission of measuring system-related information via a supply line and this information is generated by a diagnostic unit.
  • the measuring system comprises a scanning unit, via which position-dependent, analog scanning signals are generated and a Transmission of measuring system-related information via a supply line and this information is generated by a diagnostic unit.
  • a method for monitoring the function of a sensor module is known, which is designed as a monolithic integrated circuit and having a sensor and at least one measuring amplifier, wherein the sensor module has external connections at least to the power supply and an output measurement signal.
  • an active magnetic sensor comprising a magnetoelectric converter which is electrically connected to a modulator, a current source group comprising one or more current sources, which control signal output to the sensor output, wherein an undervoltage monitoring circuit ver with sensor output ver - Is bound, which monitors the voltage applied to the sensor output to the falling below a first predetermined threshold voltage and which controls depending on the result of this monitoring the signal output to the sensor output signal by influencing the current source group is provided.
  • a field device with a device for performing user-defined diagnostic methods is known.
  • An input circuit is provided, via which the device is supplied with at least one input variable.
  • an evaluation unit is provided, which serves to derive at least one parameter from at least one input variable selected by the user and at least one evaluation method selected by the user.
  • a monitoring unit is provided which uses the derived parameters monitors user-selected monitoring criteria and has an output unit that outputs a diagnosis associated with this monitoring criterion upon the occurrence of a monitoring criterion.
  • An interface is also provided, via which a user selects the input variables for each user-defined diagnostic method, selects the evaluation methods to be used for the input variables, selects the monitoring criteria, and specifies the diagnosis.
  • the invention has for its object to provide a sensor system of the type mentioned, in which can be provided diagnostic information in a simple manner.
  • the at least one sensor device has a current imprinting device, by which one or more diagnostic signals can be impressed on a supply current at the power supply terminals, and in that the at least one sensor device has a drive device for the current injection device, which controls them accordingly from diagnostic results.
  • the diagnostic signals are transmitted to the diagnostic device via power supply lines.
  • the supply current which is present anyway is impressed with an "additional current" which contains diagnostic information.
  • Such a current injection which results in a modulation of the supply current by diagnostic signals, can be easily implemented. There is no influence on a load. This gives a high interference immunity. Furthermore, there are no restrictions on cables and the like.
  • control device is integrated in an evaluation device of the at least one sensor device.
  • the evaluation device ensures the signal evaluation of one or more sensitive elements of the sensor system.
  • the evaluation device is implemented, for example, in a microprocessor. This microprocessor can then also be used to control the Stromauflessnessgungs- device.
  • the at least one sensor device has an internal monitoring device.
  • the internal monitoring device performs diagnostic checks. This can be done in an active and / or passive manner.
  • the internal monitoring device comprises one or more sensors which check sensor states.
  • the internal monitoring device can have one or more temperature sensors which measure the temperature prevailing, for example, at a sensitive element.
  • the internal monitoring device may also include one or more moisture sensors that measure the humidity on a coil of an inductive sensor device. The monitoring device can be realized at least partially in the evaluation device.
  • At least one of the following diagnostic operations can be carried out: Diagnosis of one or more sensitive elements of the at least one sensor device (such as coil wire break, core breakage, coil short circuit in inductive elements), diagnosis of signal conditioning, diagnosis of an output stage, diagnosis with respect Short circuits, power supply diagnosis, connector diagnostics, number of actuations diagnostics, external disturbance diagnostics, temperature diagnostics, range of view diagnostics, shift range diagnostics, frequency and / or amplitude diagnostics of an oscillator, etc.
  • the current injection device generates in particular current pulses which are superimposed on the prevailing supply current. These current pulses contain the diagnostic information. It is possible that current pulse sequences are generated. As a result, for example, a coded bit pattern can be generated.
  • the at least one diagnostic device evaluates a current impression on the supply current applied to the at least one sensor device.
  • the diagnostic device can "read" the diagnostic information provided by the at least one sensor device and, if necessary, further process it.
  • the power supply of the at least one sensor device takes place via the at least one diagnostic device.
  • the diagnostic device is then switched, for example, between a power supply and the at least one sensor device.
  • diagnostics information transmitted via current impressions can be read out in a simple manner.
  • the at least one diagnostic device has a Stromauflessnessgungs Surprise, by which the supply current for the at least one sensor device, a current can be impressed, and that the at least one sensor device comprises an evaluation device for an impressed on the supply current.
  • the sensor device can then communicate with the diagnostic device via currents impressed on the supply current by the diagnostic device and, in particular, current pulses.
  • the diagnostic device can transmit an acknowledgment signal to a sensor device and / or a bidirectional communication between the sensor device and the diagnostic device is possible.
  • diagnostic currents are impressed on the supply current by the current impressing device of the at least one sensor device. These are read out by the at least one diagnostic device.
  • the diagnostic device can also be the supply current Imprint modulation currents, which can then be read by the sensor device.
  • the at least one sensor device has a pulse generating device which superimposes a periodic pulse sequence on a sensor signal which can be tapped off at a sensor connection, and in that the at least one diagnostic device has a checking device for the evaluation of pulses in the sensor signal.
  • diagnosis information can be obtained by evaluating these pulses. If, for example, pulses are missing in a periodic pulse sequence, this can be used as diagnostic information.
  • any deviation from a given pulse sequence can be used as diagnostic information.
  • the pulse generating device generates pulses of the "high” type on a sensor signal (in particular a switching signal) of the "low” type and on a sensor signal of the "high” type on “low” pulses.
  • a diagnosis can be carried out both in the switching state "low” and in the switching state "high".
  • the checking device checks the presence of pulses and / or checks whether the pulse sequences are periodic and / or checks the duration and / or the distance and / or the amplitude of pulses. If, for example, there is a deviation from a specification, diagnostic information can thereby be obtained.
  • the diagnostic information can in principle be transmitted explicitly via the pulse sequence and / or a deviation in the check can be interpreted as a fault. It is particularly advantageous if pulse trains of at least one first frequency and one second frequency can be generated by the pulse generating device. This results in extended diagnostic options. For example, it is thereby possible to detect a pre-diagnosis before an actual failure of a sensor device or before operation outside of an operating range. As a result, for example, a failure can be avoided. An operator can, for example, replace the sensor device in good time, with the replacement being able to take place, for example, at a suitable time, for example on a weekend.
  • the pulse generating device is controlled in dependence on one or more trigger events in such a way that pulse sequences of a specific frequency are generated.
  • a pulse repetition frequency can be changed automatically. For example, in certain areas this allows a more accurate diagnosis and / or the change of a pulse repetition frequency is itself a diagnostic result.
  • the trigger event or events are provided by an internal monitoring device of the at least one sensor device.
  • the internal monitoring device checks, for example, certain parameters and / or states of the sensor and causes, if necessary, a change of frequency. This can then be detected in turn easily on the diagnostic device.
  • a trigger event is an exceeding or undershooting of a threshold such as a temperature threshold or humidity threshold at an inductor, etc.
  • a trigger event which is detected by an internal monitoring device, is not a state or parameter of a sensor device, but is an operating condition of the sensor device.
  • a trigger event is a reaching of a certain operating distance range or an extension of a certain operating distance. Area.
  • the at least one sensor device has a pulse generating device, which provides diagnostic pulses at a diagnostic output, pulse trains of at least a first frequency and a second frequency can be generated by the pulse generating device and the pulse repetition frequencies are dependent on one or more triggering events.
  • the sensor device has a diagnostic output at which diagnostic signals are provided directly. By changing the pulse repetition frequency can provide a diagnostic result.
  • a sensor device is provided. Furthermore, according to the invention a diagnostic device is provided.
  • Figure 1 is a schematic representation of a first embodiment of a sensor system according to the invention
  • Figure 2 is a schematic representation of a second Ausry
  • FIG. 3 shows an exemplary representation of a modulated supply current
  • Figure 4 is another exemplary representation of a modulated supply current
  • Figure 5 is a schematic representation of an embodiment of a sensor device of a third embodiment of a sensor system according to the invention
  • Figure 6 is a schematic representation of a switching signal
  • FIG. 7 is a view similar to Figure 6 with a disturbance in a modulated pulse train;
  • FIG. 8 shows pulse sequences of different frequencies;
  • Figure 9 is a schematic representation of a diagnostic device for a
  • FIG. 10 shows an exemplary representation of a pulse sequence variation in FIG
  • a first exemplary embodiment of a sensor system according to the invention which is shown in FIG. 1 and denoted there by 10, comprises a diagnostic device 12 and at least one sensor device 14.
  • the sensor device 14 is connected to the diagnostic device 12.
  • the sensor device 14 has a sensor signal connection 16 and power supply connections 18, 20.
  • the diagnostic device 12 accordingly has a connection 22 for sensor signals and connections 24, 26 for the power supply of the sensor device 14. It is possible that a plurality of sensor devices corresponding to the sensor device 14 can be connected to the diagnostic device 12. Accordingly, a plurality of terminals are provided to the diagnostic apparatus 12.
  • the sensor device 14 comprises one or more sensitive elements 28. These can interact with one or more measurement objects.
  • the sensor device 14 can be designed in many different ways. It may, for example, be an inductive sensor device. A corresponding sensitive element 28 is then a coil. It may, for example, be an optical sensor device. A sensitive element 28 is then a light receiver. It may be a magnetic field sensitive sensor device. The corresponding sensitive element then reacts to magnetic fields. It can be a capacitive sensor device. The sensitive element is then a capacity.
  • the sensor device may, for example, also be an ultrasound sensor device or magnetostrictive sensor device or a microwave sensor device.
  • the sensor device 14 is a distance sensor device or distance measuring sensor device, by means of which distances or paths can be determined. It is possible in principle that such distances can be determined analogously or as switching distances.
  • the sensor device 14 has a housing 30.
  • an evaluation device 32 is positioned in the housing 30, which is realized, for example, at least partially by a microprocessor.
  • a Stromauflessnessgungs listening 34 is further arranged.
  • This Stromauflessnessgungs listening 34 is associated with a drive means 36 which controls the Stromauflessnessgungs issued 34.
  • the control device 36 is integrated in particular in the evaluation device 32.
  • Stromauflessnessgungs Rhein 34 can be a power current I cc of the sensor device 14 impress a current.
  • pulses 38 or pulse trains 40 (FIGS. 3 and 4) can be impressed.
  • a supply current I cc for the sensor device 14 can be modulated. This current injection takes place in such a way that the power supply of the sensor device 14 is not disturbed.
  • the impressed pulses 38 in the supply current I cc are diagnostic signals detectable from outside the sensor device 14, which are diagnostic of the
  • a monitoring device 42 is arranged in the housing 30 of the sensor device 14. This monitoring device 42 performs diagnostic operations on the sensor device 14.
  • the monitoring device 42 can passively or actively perform diagnostic operations.
  • the monitoring device 42 comprises one or more sensors which check states of the sensor device 14 or parameters of the sensor device 14.
  • the monitoring device 42 comprises one or more temperature sensors, which perform a temperature monitoring within the sensor device 14.
  • the monitoring device 42 can also be partially or completely integrated into the evaluation device 32.
  • the monitoring device 42 can check certain parameters that are measured or, for example, also provided via the at least one sensitive element 28 of the evaluation device 32.
  • the monitoring device 42 carries out diagnostic operations such as diagnosis of the at least one sensitive element 28, diagnosis of signal conditioning, diagnosis of an output stage, diagnostics. with regard to short circuits, diagnosis of power supply, diagnosis of connectors (such as plugs, etc.), diagnosis of number of operations, diagnosis of external disturbances (such as contamination of an optical sensor), temperature diagnosis, measurement range diagnosis, shift range diagnosis, Diagnosis of frequency and / or amplitude of an oscillator, etc.
  • diagnostic operations such as diagnosis of the at least one sensitive element 28, diagnosis of signal conditioning, diagnosis of an output stage, diagnostics. with regard to short circuits, diagnosis of power supply, diagnosis of connectors (such as plugs, etc.), diagnosis of number of operations, diagnosis of external disturbances (such as contamination of an optical sensor), temperature diagnosis, measurement range diagnosis, shift range diagnosis, Diagnosis of frequency and / or amplitude of an oscillator, etc.
  • a diagnosis can, for example, also comprise a plausibility check of signals which the at least one sensitive element 28 provides.
  • the diagnosis of the at least one sensitive element 28 may be, for example, if the sensitive element is an inductive element, a check on coil wire break, coil short circuit and / or core breakage.
  • the corresponding diagnostic signals are then impressed as pulses 38 or as pulse sequence 40 to the supply current. At the power supply terminals 18 then these diagnostic signals can be tapped.
  • a pulse 38 which is impressed on the power supply terminal 18, indicates a fault.
  • a pulse 38 or a pulse train 40 indicates the absence of a fault.
  • the diagnostic device 12 has a monitoring device 44, by which the current impressed on the current I cc can be evaluated.
  • the monitoring device 44 is connected between the power supply terminals 24 and 26 in order to detect the current modulation can. It is basically possible that the power supply of the sensor device 14 via the diagnostic device 12 takes place.
  • the diagnostic device 12 can be configured directly, for example, as a power supply unit or can be connected to a network device.
  • the diagnostic device 12 then provides further processed diagnostic signals by a higher-level evaluation. It is also possible to carry out an evaluation and in particular pre-evaluation on the diagnostic device 12.
  • the diagnostic device 12 may include a monitoring device 46, by means of which impressed pulses can be detected by a sensor signal which can be tapped off at the sensor signal connection 16.
  • the diagnostic device 12 is, for example, a field device which can be connected to a bus system 48. On the bus system 48 then sensor signals and diagnostic signals can be transmitted, for example, to a higher-level evaluation.
  • the diagnostic device 12 has a Stromauflessnessgungs driven 170. By this Stromillerlessnessgungs- device 170, the diagnostic device 12 can impose a modulation current to a supply current for the sensor device 14.
  • the sensor device 14 accordingly has an evaluation device 172 for a current injection in the supply current.
  • the evaluation device evaluates the current impression which does not originate from the current impressing device 34 of the sensor device 14, but which originates from the current impressing device 170 of the diagnostic device 12.
  • the current impressing device 170 of the diagnostic device 12 and the evaluation device 172 for current impressing the sensor device 14 possible sending of acknowledgment signals by the diagnostic device 12 and the receipt of acknowledgment signals by the sensor device 14.
  • a bidirectional communication between the sensor device 14 and the diagnostic device 12 is possible.
  • the sensor device is fundamentally the same as described above, and therefore the same reference numerals are used.
  • a diagnostic device 52 is provided which has a diagnostic output 54 and a sensor signal output 56. At the diagnostic output 54 diagnostic signals can be tapped. These are generated by a monitoring device according to the monitoring device 44 from the supply current impressed current signals.
  • a monitoring device 46 is also provided for sensor signals, this can also provide its corresponding diagnostic signals to the diagnostic output 54.
  • the diagnostic device 52 works like the diagnostic device 12 described above.
  • diagnostic signals are transmitted from the sensor device 14 to the diagnostic device 12 and 52 via the power supply, respectively; There is a current impression on a supply current and thus a modulation via the power supply.
  • current pulses of a magnitude less than or equal to 20 mA (such as 10 mA, for example) are impressed.
  • Such a diagnostic signal transmission from a sensor device 14 to a diagnostic device 12 or 52 has a high interference immunity. It exists no restrictions on cables or the like. This also has no effect on the load.
  • the corresponding diagnostic signals can be easily evaluated or provided on the diagnostic device 12 or 52.
  • the transmission of diagnostic signals can be done as a pure fault indication. However, it is also possible to transmit coded information in order to transmit more detailed diagnostic information to the diagnostic device 12 or 52.
  • the modulation of the supply current for the transmission of diagnostic signals may be the only transmission path for diagnostic signals. It is also possible that additional diagnostic signals are transmitted via a sensor signal connection.
  • a third exemplary embodiment of a sensor system according to the invention comprises a sensor device 58 (FIG. 5).
  • this sensor device is an optical light barrier.
  • This comprises a housing 60 with a first arm 62 and a second arm 64.
  • a light transmitter 66 which emits transmitted light via a corresponding optical imaging device 68.
  • the light receiver 70 is associated with an optical imaging device 72.
  • the light emitter 66 and the light receiver 70 are aligned with each other. This makes it possible to detect whether a measuring object is immersed in the beam path 74 between the first arm 62 and the second arm 64.
  • the sensor device 58 is designed as a fork light barrier device.
  • the light transmitter 66 which in particular comprises a transmitting diode, is driven via a driver stage 76. This is driven pulsed via a drive means 78.
  • the light receiver 70 is followed by an amplifier 80.
  • a device 82 for determining the intensity can be provided.
  • An evaluation unit 84 receives the corresponding amplified and preprocessed signals. This is also coupled to the driver 78 to perform a "pulse synchronization" can.
  • the evaluation unit 84 can be assigned an adjusting device 86 for setting a switching point or the sensitivity.
  • the evaluation unit 84 is associated with a device 88 for switching signal generation.
  • the control device 78, the evaluation unit 84 and the device 88 are realized in particular in a microprocessor 90.
  • the sensor device 58 further comprises a pulse generating device 92 which generates diagnostic pulses 94 and superimposes them via a summer 96 to a sensor signal. This sensor signal can be picked up with an intermediate output stage 98 at a sensor signal terminal 100.
  • the pulse generator 92 and the summer 96 are implemented in particular in the microprocessor 90.
  • the pulse generating device 92 is coupled to the drive device 78 and / or evaluation unit 84.
  • a pulse sequence can be generated when a there is a certain deviation between transmission pulse generation and received light pulses.
  • contamination of one of the optical imaging devices 78, 72 may cause the light receiver 70 to stop receiving light.
  • no pulses are registered at the evaluation unit 84, but at most a background. This can then, as explained in more detail below, influence the pulse generation by the pulse generation device 92.
  • a drive device 102 for the pulse generating device which is coupled to an internal monitoring device of the sensor device 58.
  • the internal monitoring device 104 basically functions in the same way as the internal monitoring device 42 described above in the sensor device 14. If, for example, a fault is detected, then the pulse generating device 92 can be controlled accordingly to generate a specific pulse or a specific pulse train.
  • a signal 106 is provided by the microprocessor 90 which is set to "low” (reference number 108 in FIG. 6) if an object is not present , and set to "high” (reference numeral 110) when an object exists.
  • the corresponding sensor device 58 has a switching threshold 112 for this purpose.
  • the pulse generator 92 superimposes a periodic pulse train 114 on the corresponding sensor signal. For example, individual pulses 116 have a typical duration in the range between 100 and 300. A distance between adjacent pulses 116 is large with respect to this pulse duration. For example, this distance is in the range between 5 ms and 7 ms.
  • the pulses are superimposed on the sensor signal 106 so that "high" pulses are impressed in the "low” region of the sensor signal (pulses 116 in FIG. 6). In the "high” region of the sensor signal "low” pulses 118 are impressed.
  • a resulting signal 120 which can be tapped off at the sensor signal terminal 100 then contains the switching information and the information contained in the pulses. The imprinting of the pulses, in turn, can be effected as a function of diagnostic results.
  • pulses can be omitted in a pulse sequence (pulses 122, 124 in FIG. 7). Such missed pulses indicate, for example, a fault. It is possible in principle that such a change in the periodic pulse train is actively controlled or generated directly by a fault.
  • a diagnostic signal can be superimposed on the sensor signal, which can be evaluated in a simple manner (see below).
  • the pulse generating device 92 is designed so that the sensor signal pulse sequences of different frequencies can be impressed.
  • a pulse sequence 126 of a first frequency can be impressed on the sensor signal, or a pulse sequence 128 of a second frequency can be impressed. (Basically, it is possible that pulse sequences of other frequencies are aufoniagbar.)
  • the first frequency and the second frequency are different. For example, the second frequency is twice as high as the first frequency.
  • Whether the pulse train 126 or the pulse train 128 is impressed on the sensor signal depends in particular on one or more trigger events. In particular, this activation takes place in turn by the activation device 102 and / or via the activation unit 84. This makes it possible, for example, to provide a higher-frequency pulse sequence if greater diagnostic reliability is required.
  • this also makes it possible, for example, to obtain a prediagnosis, for example, before a sensor failure or a sensor failure.
  • a trigger event which causes the change in the frequency with respect to the pulse train, is in particular falling below or exceeding a threshold value.
  • the exceeding or falling below can in turn be determined by the monitoring device 104.
  • An example is, for example, the exceeding of a predetermined temperature value.
  • the corresponding temperature sensor of the monitoring device 104 outputs its temperature value to the drive device 102. If the drive device 102 detects that a temperature threshold is exceeded, then the pulse generating device 92 is correspondingly driven to effect, for example, a pulse train of the higher second frequency. This in turn allows an operator to receive an alert.
  • a trigger event which causes a change in the frequency of the pulse sequence can, for example, also be the undershooting or exceeding of a distance range or a switching range. This is shown by way of example in FIG. There, a distance-sensitive sensor device is moved toward a measurement object at a distance d from infinity to zero. The switching distance Sn is the one in which a switchover takes place.
  • the sensor device is then designed so that at high distances, when the switching signal is "low", there is the pulse train 128 of high frequency.
  • a switch can be made to the pulse train 126 low frequency. If, for example, a switching distance of the order of magnitude of 90% Sn is detected, switching back to the higher frequency pulse sequence can take place again. If a switching distance of, for example, 15% Sn is detected, in turn, switching to the pulse sequence 126 of smaller frequency can take place.
  • an operator at a corresponding diagnostic device can be directly displayed as to whether the sensor device 58 is in an operating point range or not.
  • a sensor system is formed with one or more sensor devices 58 and a diagnostic device 130 (FIG. 9).
  • the diagnostic device 130 comprises a plurality of connection devices 132 for sensor devices 58 for this purpose.
  • the connection device 132 in turn comprises a connection 134 for sensor signals.
  • Subordinate to such a connection 134 is a device 136 for signal separation.
  • This device 136 separates the actual sensor signal from the impressed pulses.
  • a corresponding generated sensor signal without pulses is forwarded to an evaluation device 138. This performs an evaluation or preliminary evaluation or conditioning of sensor signals. Via a corresponding interface 140, these can then be given to a bus, for example, or read out directly.
  • a checking device 142 of the evaluation device 138 checks the pulses which were previously separated.
  • Pulses are detected, for example, via monoflops or interrupts. This will provide diagnostic information.
  • the checking device 142 checks, for example, the presence of pulses and / or the periodicity of pulse sequences and / or the duration and / or the distance and / or the amplitude of pulses. From this information is then obtained. These can then also be transmitted via the interface 140 to the bus. It is also possible for a sensor device to have a diagnostic output in addition to a signal connection and supply current connections. A pulse generating device can provide pulses to a diagnostic output which contain diagnostic information. It is also possible that pulse sequences of different frequencies are provided at the diagnostic output, wherein the selection of the frequency is controlled by one or more trigger events.

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  • General Physics & Mathematics (AREA)
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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L'invention vise à mettre au point un système de détection (10) comprenant au moins un appareil de détection (14), qui présente au moins une connexion de signal de de détection (16) et des bornes d'alimentation en courant (18, 20), ainsi qu'au moins un appareil de diagnostic (12), auquel un ou plusieurs appareils de détections peuvent être raccordés, des signaux de diagnostic provenant du ou des appareils de de détection raccordés pouvant être fournis et/ou analysés par le au moins un appareil de diagnostic, système sur lequel des informations de diagnostic peuvent être mises à disposition de façon simple.A cet effet, le au moins un appareil de détection présente un dispositif d'application de courant (34) par le biais duquel un ou plusieurs signaux de diagnostic peuvent être appliqués à un courant d'alimentation aux bornes d'alimentation en courant, et le au moins un appareil de détection présente un dispositif d'activation (36) pour le dispositif d'application de courant qui actionne ce dispositif en fonction des résultats de diagnostic. En variante,l'appareil de détection (58) superpose au signal de détection une séquence périodique d'impulsions qui peut être analysée par l'appareil de diagnostic ou l'appareil de détection fournit des impulsions de diagnostic dont la fréquence de séquence d'impulsions dépend d'un ou de plusieurs événements déclencheurs, à une sortie de diagnostic
PCT/EP2010/066482 2009-11-13 2010-10-29 Système de détection, appareil de détection et appareil de diagnostic WO2011057904A1 (fr)

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DE102009046691.6 2009-11-13
DE200910046691 DE102009046691B4 (de) 2009-11-13 2009-11-13 Sensorvorrichtung

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DE102012008999B3 (de) * 2012-05-04 2013-10-10 HKR Seuffer Automotive GmbH & Co. KG Verfahren zur Steuerung einer Leistungszufuhr und Vorrichtung
US9096087B2 (en) 2012-09-26 2015-08-04 Hewlett-Packard Development Company, L.P. Detection of an event signal and a heartbeat signal provided along a signal path
EP3056866A1 (fr) * 2015-02-11 2016-08-17 Melexis Technologies NV Rapport de diagnostic des circuits intégrés dans un capteur

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DE102021000158A1 (de) 2021-01-15 2022-07-21 Pepperl+Fuchs Se Induktive Sensoreinheit
DE102021000155A1 (de) 2021-01-15 2022-07-21 Pepperl+Fuchs Se Induktive Sensoreinheit und Überwachungsverfahren

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EP0803632A1 (fr) * 1996-04-26 1997-10-29 Nabco Limited Capteur de porte avec fonction d'autodiagnostique
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DE10146949A1 (de) 2000-11-22 2002-06-06 Continental Teves Ag & Co Ohg Aktiver Magnetsensor für elektronische Bremssysteme
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EP1501167A2 (fr) * 2003-07-19 2005-01-26 Airbus Deutschland GmbH Système et procédé pour détecter des défauts dans un réseau électrique d'un avion
EP1521086A1 (fr) * 2003-10-03 2005-04-06 Matsushita Electric Industrial Co., Ltd. Capteur inertiel et capteur combiné le comprenant
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CN103383586B (zh) * 2012-05-04 2017-12-01 Hkr苏弗汽车两合公司 控制功率馈送的方法及装置
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