EP1984701A2 - Montage et procede pour calibrer un dispositif de detection destine en particulier a des meubles a déplacement motorise, amplificateur de mesure et dispositif de detection - Google Patents

Montage et procede pour calibrer un dispositif de detection destine en particulier a des meubles a déplacement motorise, amplificateur de mesure et dispositif de detection

Info

Publication number
EP1984701A2
EP1984701A2 EP07711469A EP07711469A EP1984701A2 EP 1984701 A2 EP1984701 A2 EP 1984701A2 EP 07711469 A EP07711469 A EP 07711469A EP 07711469 A EP07711469 A EP 07711469A EP 1984701 A2 EP1984701 A2 EP 1984701A2
Authority
EP
European Patent Office
Prior art keywords
signal
sensor
calibration
circuit arrangement
arrangement according
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Withdrawn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
EP07711469A
Other languages
German (de)
English (en)
Inventor
Walter Koch
Mario Schenk
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.)
Logicdata Electronic and Software Entwicklungs GmbH
Original Assignee
Logicdata Electronic and Software Entwicklungs 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 Logicdata Electronic and Software Entwicklungs GmbH filed Critical Logicdata Electronic and Software Entwicklungs GmbH
Publication of EP1984701A2 publication Critical patent/EP1984701A2/fr
Withdrawn legal-status Critical Current

Links

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
    • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
    • G01D18/002—Automatic recalibration
    • G01D18/006—Intermittent recalibration

Definitions

  • the invention relates to a circuit arrangement and a method for calibrating a sensor arrangement, in particular for motor-adjustable furniture, as well as a measuring amplifier and a sensor arrangement.
  • Motor-adjustable furniture is increasingly being used, especially in the design of workplaces, to ensure a simple and ergonomic adaptation to different conditions.
  • working tables are adjustable in height or otherwise by means of a motor and a corresponding control device.
  • the control device of an electric motor must, on the one hand, operate precisely and, on the other hand, be designed to withstand the occurrence of a fault or obstacle, e.g. a person or an object, in the adjustment of the work table or one of its drive parts to shut down the engine or at least to protect against overloading. In no case may the obstacle be damaged or crushed, or even a person may be injured.
  • Automotive technology where crushing forces can occur in motorized side or roof windows.
  • the occurrence of a fault or an obstacle in the operation of a motor affects the operating parameters of the engine, which can be detected by means of one or more sensors.
  • the engine torque can be detected by means of a torsion sensor, for example via strain gauges, or by means of a pressure sensor coupled to the engine support.
  • the motor load can also be detected by measuring the motor current.
  • An approach to an obstacle can also be detected independently of the engine parameters, for example with the aid of ultrasonic sensors or optical sensors.
  • Sensor arrangements usually require a measuring amplifier with a processing device for the sensor signal generated by the sensor used.
  • the sensor signal is usually an analog electrical signal and corresponds to the physical quantity detected by the sensor, such as pressure, temperature, strain, etc.
  • Processing device prepares this sensor signal so that it can be used by the operating circuit analog or digital.
  • the operating circuit analog or digital In order to achieve a high sensitivity of the sensor arrangement, the
  • Processing device usually meet high demands on accuracy and gain.
  • the sensor arrangements are subject to special influences such as drift, offset, temperature, material aging or other influences.
  • the invention has for its object to provide a circuit arrangement and a method of the type mentioned, which are inexpensive to produce or operable and / or work reliably. Furthermore, a sensor arrangement should be easy to handle. In addition, a correspondingly inexpensive measuring amplifier and a sensor arrangement are to be specified.
  • Embodiments of the invention are characterized in dependent claims.
  • a circuit arrangement is provided with a signal processing device for processing a sensor signal and with a calibration device, which adjusts the signal processing device at a predetermined time by means of a control signal to a predetermined value.
  • the invention is based on the finding that in certain systems, for example in certain applications of motor drives, no absolute measurement accuracy of a sensor arrangement used therein is necessary. Rather, it is sufficient, starting from an initial state at a certain time, a relative change of the system or a relative change of a physical quantity with the To detect sensor arrangement. Above all, these systems or applications have the identical property that activation takes place only for a short time and is then no longer required. For example, the drive motor of an adjustable work table is activated only for a short time and must be monitored accordingly only in the period of its activation. The same applies to a window adjustment or seat adjustment, for example in an automobile.
  • a calibration of the signal processing device of the sensor arrangement is therefore carried out by means of a control signal.
  • Calibration means that the zero point and / or the gain of the sensor arrangement or the signal processing device are set to a predetermined value.
  • the reference signal for the calibration is preferably the measurement signal of the sensor arrangement itself. Each measurement after the calibration therefore takes place with optimized parameters. During the typical activation time of the system or the sensor in the range of several seconds to several minutes, the parameters thus determined are subject to little or no change.
  • the invention has the particular advantage that the calibration is not only related to the sensor signal but certain parasitic properties, e.g. the offset, the subsequent signal processing means comprises.
  • the calibration device contains a feedback device for the automatic adjustment of the circuit arrangement.
  • the automatically controlled calibration enables in a particularly advantageous manner a simple and error-free handling.
  • the adjustment can be carried out automatically when the control signal is applied, that is to say at an optimum operating time.
  • the calibration device provides a calibration signal as a control signal, which is compared in the signal processing device or the measuring amplifier branch with the sensor signal.
  • the sensor signal is used during calibration as a reference signal.
  • the calibration signal is adjusted by the calibration device to meet predetermined calibration values.
  • the calibration signal is an analog signal.
  • the calibration signal can be directly compared with the sensor signal without further measures.
  • the analog calibration signal and the analog sensor signal can be formed in a bridge circuit as measurement signals in each case of a half-bridge branch. The calibration of the sensor arrangement then corresponds to the adjustment of a bridge circuit and is therefore simple and at the same time precise.
  • the calibration signal may be pulse width modulated or pulse frequency modulated, so that the adjustment of the height of the effective value of the analog calibration signal value can be done with digital control means.
  • the signal processing device includes a filter device. This makes it possible with advantage to separate the useful signal from interference signals, whereby a high signal-to-noise ratio is possible even with low sensor signals.
  • Low pass filter arrangement contains. This makes it possible in a simple manner to convert the modulated calibration signal into a DC signal. As a low-pass filter filter first or higher orders can be provided.
  • the calibration device separate arrangements on the one hand for the zero point adjustment and on the other hand for the amplification of the measuring amplifier. In this way an iterationsbond calibration possible, which allows a particularly fast calibration.
  • the calibration device contains a microcomputer (microcontroller).
  • the microcomputer includes an analog or digital comparator which compares the signal to be adjusted with a predetermined value.
  • An analog-to-digital converter may also be provided which digitizes the analog output signal of the circuit arrangement so that it can be further processed.
  • the microcomputer sets the calibration signal so that the output signal of the circuit arrangement or the sensor arrangement is adjusted to the predetermined value.
  • the predetermined value may correspond to the sensor signal as a reference value or be programmable, so that the sensor arrangement can operate in an optimal operating state, depending on the intended use.
  • the feedback branch or the microcomputer keeps the calibrated operating point constant, e.g. with the help of a storage device.
  • Signal processing device of the sensor arrangement is then functionally operated as a measuring amplifier, so that even small changes in the sensor signal can be greatly amplified in the signal processing device thus operating as a measuring amplifier. For this reason, it is possible to obtain a large resolution of the sensor arrangement even with a small output signal range.
  • the amplified sensor signal with advantage in output digital form. Furthermore, it is possible to generate a status signal with the aid of the microcomputer, which indicates the correct functioning of the measuring amplifier or vice versa an error condition.
  • the measuring device may advantageously comprise an analog-to-digital converter.
  • control signal is not applied in the form of an external signal but is generated by switching on the supply voltage. In this way, a signal line can be saved.
  • the clock generator present in the measuring device or the microcomputer does not operate with sufficient accuracy or at a suboptimal clock frequency, it is particularly advantageous to connect an external clock generating device which takes over the clock control of the microcomputer.
  • a precise clock signal can be easily generated with a few low-cost elements.
  • the circuit arrangement can be used advantageously for many types of sensors, e.g. for a magnetic or an optical sensor.
  • a magnetic Hall sensor can be used as a distance sensor or rotation angle sensor or in another function.
  • the invention is suitable for pressure sensors, force sensors, ultrasonic sensors and other sensors.
  • Figure 2 is a schematic sensor and circuit arrangement as a development of the arrangement of Figure 1 and
  • FIG. 3 is a further schematically illustrated
  • Figure 4 is a detailed schematic representation of the sensor arrangement with circuit arrangement.
  • a sensor arrangement 1 generates a sensor signal 7, which corresponds to a first input of a sensor
  • Signal processing device 3 is supplied.
  • the signal processing device amplifies and filters the sensor signal and provides an output signal 9 at an output 5 for further use.
  • the output signal can be used, for example, for the control of an electric motor.
  • the output signal 9 on the other hand, a feedback device of a measuring and
  • the feedback device is designed to function as a Calibration signal can give an adjustable output signal.
  • a comparison device 41 which compares the output signal of the circuit arrangement with a predetermined value and with a control member 42 generates a control signal which controls the actuator 2.
  • a control member 42 generates a control signal which controls the actuator 2.
  • an analog comparator optionally with control element, which on the output side generates a comparison signal which controls a controlled voltage or current source in the actuator.
  • the actuator may also be integrated into the measuring and control device.
  • the output signal of the circuit arrangement or the input signals of the measuring and control device 4 can be converted into digital signals and further processed. This is done by an analog-to-digital converter 46 (FIG. 2).
  • the measuring and control device 4 and the signal processing device 3 and the actuator 2 are connected to a terminal 6, to which a control signal 10 can be applied.
  • the measuring device switches, for example by means of a sequence control 43, for example by means of a controlled switch in a calibration mode and generates with the actuator 2, a calibration signal 8, which is designed so that the output signal of the signal processing device 3 assumes the predetermined value.
  • a calibration signal 8 which is designed so that the output signal of the signal processing device 3 assumes the predetermined value.
  • the value of the calibration signal 8 is kept constant by the sequence control or the elements of the measuring and control device in order to amplify the sensor signal with the signal processing device 3 and filter it if necessary.
  • the circuit arrangement thus operates in the normal balanced operating state as a measuring amplifier for the sensor signal 7.
  • the signal processing device 3 includes amplifier elements which provide the sensor signal 7 as an amplified output signal at the output 5.
  • the calibration process can be repeated.
  • the predetermined value for the calibration of the signal processing device determines the operating point of the sensor arrangement. For this purpose, the adjustment of the output signal from the zero point and the gain of the
  • Signal processing device 3 set.
  • the adjusted operating state it is thus possible, for example, with a mass-dependent strain sensor and a
  • the circuit arrangement may be, for example, with the aid of a switch which is actuated when a calibration criterion is met, be switched to normal operation, ie balanced state with constant calibration signal.
  • the actuator includes a resistive voltage divider with the resistors 21 and 22 which is connected to the operating potentials VDD and VSS.
  • Resistor 22 is adjustable and receives the setting signal from a measuring and control device 4 with an external clock generation 44.
  • the measuring and control device includes an analog-to-digital converter 46, the first analog output signal 9 of the circuit or the signal processing device 3 in digital Converts signals. The latter can be further processed with a microcomputer, not shown, which can be simple and inexpensive.
  • the analog-to-digital converter 46 may provide a digital output signal or a status signal at the port 51. Precise external clock generation can improve the operating characteristics of the microcomputer over the internal clock generator.
  • the calibration signal 8 is supplied to an input of an amplifier 31 of the signal processing means 30 for comparison with the sensor signal 7 to set the zero point.
  • the sensor signal or the calibration signal are supplied to the inverting or non-inverting input of the amplifier 31, which amplifies the difference between the two signals.
  • the amplifier 31, which has a constant gain, an amplifier 33 is connected downstream, the gain of which can be adjusted by the measuring and control device. This allows an iteration-free adjustment because zero point and gain can be set separately.
  • a low pass 32 may be provided between the comparator 31 and the amplifier 33.
  • FIG. 3 shows another exemplary embodiment, which as output-side control element comprises a pulse width modulator 45 or a pulse frequency modulator.
  • the comparison device 41 the sensor signal 7 and the output signal 9 are compared.
  • Pulse Width Modulation is also referred to as Pulse Width Modulation (PWM) or Pulse Width Modulation (PDM).
  • PBM Pulse Width Modulation
  • PWM Pulse Width Modulation
  • PDM Pulse Width Modulation
  • the pulse width can be 12 bits, for example.
  • the pulse width frequency is filtered out again in the correspondingly designed signal processing device 300 with a low-pass device. For example, the pulse width frequency is about 5 kHz, while the upper limit frequency of the signal processing device is 80 Hz.
  • the gain factor can be 6000.
  • the pulse width frequency then has virtually no effect on the useful signal and can be further positively influenced by a filter with better slope and quality.
  • FIG. 4 shows a further exemplary embodiment.
  • the actuator 2 contains an ohmic voltage divider with the series-connected elements 23 and 24, which form a branch of a bridge circuit.
  • the actual sensor elements in the other branch of the bridge circuit form series-connected strain gauges or strain gauges 11 and 12 of a strain or torsion sensor.
  • One application of the strain gauges is z.
  • the tapped at the voltage divider with the resistors 23 and 24 voltage is pulse width modulated or pulse frequency modulated using the measuring and control device 4.
  • the value of the calibration signal 8 at the input of the amplifier 311 can be adjusted.
  • the pulse frequency which may be in the range of a few kHz or more, must be filtered out again during the processing of the useful signal, that is to say of the sensor signal 7. This is one of the tasks of the signal processing device 300 to which the bridge voltage formed from the signals 7 and 8 is supplied.
  • the amplifier 311 For filtering the modulation frequency is the amplifier 311, which is designed by means of the feedback elements 312 and 313 as an active low-pass filter.
  • the amplifier 331 with its feedback elements 332 and 333 forms with the resistors 321 and 323 and the capacitor 322 another active second-order low-pass filter.
  • the signal processing device 300 thus contains a third-order low-pass filter in the exemplary embodiment. It goes without saying that even low passes of other orders are possible.
  • the clock of the measuring and control device 4 is clocked by the clock generator 42 at a higher frequency CLK than the pulse frequency, for example at 20 MHz clock frequency.
  • the measuring and control device 4, the output signal 9 and the sensor signal 7 are supplied, which are processed as in the embodiment of Figure 3.
  • a digital output signal and / or, at a not shown further output 51 (see corresponding to Figure 3), a status signal are emitted, which shows the operating state of the circuit.
  • the control signal for the calibration mode is generated in the arrangement of Figure 4 when switching on the power supply.
  • the calibration signal 8 is kept constant, so that the signal processing device 3, 30 or 300 then serves as a calibrated measuring amplifier and occurring changes in the sensor signal 7 can be highly amplified by the operating point of the circuit arrangement and lead to a high sensitivity of the arrangement.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Control Of Electric Motors In General (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

La présente invention concerne un montage destiné en particulier à des meubles à déplacement motorisé, comprenant un dispositif de traitement de signal (3) qui sert à traiter un signal de détection (7), et un dispositif de calibrage (2, 3, 4) qui, à un instant prédéterminé, règle le dispositif de traitement de signal sur une valeur prédéterminée, au moyen d'un signal de commande (10). Dans le cadre du procédé pour calibrer un dispositif de détection, un signal de commande est produit qui active un dispositif de calibrage qui produit à son tour un signal de calibrage qui peut être réglé avec un signal de détection. L'invention a également pour objet un amplificateur de mesure correspondant et un dispositif de détection correspondant.
EP07711469A 2006-02-08 2007-02-08 Montage et procede pour calibrer un dispositif de detection destine en particulier a des meubles a déplacement motorise, amplificateur de mesure et dispositif de detection Withdrawn EP1984701A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610005835 DE102006005835A1 (de) 2006-02-08 2006-02-08 Schaltungsanordnung und Verfahren zur Kalibrierung einer Sensoranordnung, insbesondere für motorisch verstellbare Möbel, sowie Messverstärker und Sensoranordnung
PCT/EP2007/001076 WO2007090643A2 (fr) 2006-02-08 2007-02-08 Montage et procédé pour calibrer un dispositif de détection destiné en particulier à des meubles à déplacement motorisé, amplificateur de mesure et dispositif de détection

Publications (1)

Publication Number Publication Date
EP1984701A2 true EP1984701A2 (fr) 2008-10-29

Family

ID=38158106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07711469A Withdrawn EP1984701A2 (fr) 2006-02-08 2007-02-08 Montage et procede pour calibrer un dispositif de detection destine en particulier a des meubles a déplacement motorise, amplificateur de mesure et dispositif de detection

Country Status (3)

Country Link
EP (1) EP1984701A2 (fr)
DE (1) DE102006005835A1 (fr)
WO (1) WO2007090643A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013014876B3 (de) 2013-09-06 2014-12-11 Hottinger Baldwin Messtechnik Gmbh Messverstärker mit Hintergrundjustierung und Verfahren dafür
DE102022208219A1 (de) 2022-08-08 2024-02-08 Robert Bosch Gesellschaft mit beschränkter Haftung Sensorsystem und Verfahren zum Betrieb eines Sensorsystems, elektronisches Gerät

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097732A (en) * 1977-06-02 1978-06-27 Burroughs Corporation Automatic gain control for photosensing devices
JPH03134552A (ja) * 1989-10-20 1991-06-07 Hitachi Ltd 自己較正機能付検出装置
DE19707263B4 (de) * 1997-02-24 2006-03-16 Infineon Technologies Ag Verfahren zum Einstellen von Schaltpunkten bei einem Sensor-Ausgangssignal
US6249753B1 (en) * 1998-12-29 2001-06-19 Square D Company Sensor signal conditioner with calibration
DE10141331B4 (de) * 2001-08-28 2004-11-18 Zentrum Mikroelektronik Dresden Ag Verfahren zur Offsetkalibrierung eines Sensorsignals und Sensoranordnung zur Durchführung des Verfahrens
DE10207228A1 (de) * 2002-02-21 2003-09-04 Bosch Gmbh Robert Verfahren zur Kalibrierung eines Sensors und Schaltungsanordnung zum Betreiben eines Sensors
US6996488B2 (en) * 2002-10-15 2006-02-07 Advanced Custom Sensors, Inc. Sensor signal conditioner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007090643A3 *

Also Published As

Publication number Publication date
WO2007090643A2 (fr) 2007-08-16
WO2007090643A3 (fr) 2007-10-04
DE102006005835A1 (de) 2007-08-16

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