EP1583974A1 - Procede permettant de faire fonctionner un capteur et dispositif d'evaluation permettant la mise en oeuvre dudit procede - Google Patents

Procede permettant de faire fonctionner un capteur et dispositif d'evaluation permettant la mise en oeuvre dudit procede

Info

Publication number
EP1583974A1
EP1583974A1 EP03770937A EP03770937A EP1583974A1 EP 1583974 A1 EP1583974 A1 EP 1583974A1 EP 03770937 A EP03770937 A EP 03770937A EP 03770937 A EP03770937 A EP 03770937A EP 1583974 A1 EP1583974 A1 EP 1583974A1
Authority
EP
European Patent Office
Prior art keywords
sensor
signal
output signal
sensor output
signals
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.)
Ceased
Application number
EP03770937A
Other languages
German (de)
English (en)
Inventor
Mario Engelmann
Wolfgang Fey
Frank Kurz
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.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and Co OHG
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 Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP1583974A1 publication Critical patent/EP1583974A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
    • G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/489—Digital circuits therefor

Definitions

  • the invention relates to a method for operating a sensor, in particular a wheel speed sensor, which transmits sensor output signals to an electronic evaluation device. It also relates to an electronic evaluation device for an assigned sensor for performing the method.
  • a measurement value pickup is usually provided, which can be provided, for example, with a magnetostatically sensitive element with a permanent magnet.
  • the transducer interacts with a suitable encoder or transducer that executes the movement to be detected.
  • the sensor element responds, for example, to a change in the magnetic flux density or the field vector caused by the movement of the encoder to be detected, the output signal of the sensor element being fed to a modulator, which usually generates a periodic sensor voltage or a periodic sensor current, the frequency of which is determined by the speed of movement is determined.
  • Active sensors of this type are becoming increasingly widespread in motor vehicle technology, for example in driving stability or in motor vehicle brake regulation, in particular as wheel speed sensors. Particularly in connection with possible applications in safety-relevant areas, such as, for example, brake control in a motor vehicle, particularly high reliability of the output signals supplied by the sensors is of particular importance.
  • an input circuit of a brake control device for a wheel speed sensor is known, with which the signal of a 2-level or 3-level sensor is processed.
  • the known circuit prepares the current signal of a wheel speed sensor for the brake control unit, so that transmission interference is largely eliminated.
  • the signal is filtered to avoid misinterpretation of the signal due to short-term signal interference.
  • the pulse signal of the active sensor is checked with threshold values, as shown in FIG. 1. If the signal exceeds or falls below the predetermined thresholds, the sensor signal is rejected and an error signal is generated.
  • the invention has for its object to provide a method of the type mentioned above, with which a particularly high reliability in the evaluation of the sensor output signals and thus a particularly high level of operational safety can be achieved.
  • an evaluation device that is particularly suitable for carrying out the method is to be specified.
  • the evaluation device and the circuit arrangement provided for this purpose serve in particular to improve the circuit arrangement known from WO 00/22441, so that reference is made to the above-mentioned document with regard to the other components of the circuit which are not explicitly explained below.
  • the stated object is achieved according to the invention in that the temporal behavior of a characteristic sensor signal is monitored and compared with an expected temporal behavior, wherein if the determined temporal behavior deviates from more than a predefinable tolerance threshold, a malfunction of the sensor is concluded becomes.
  • the invention is based on the consideration that particularly high operational safety and particularly high reliability in evaluating the output signals provided by the sensor can be achieved in particular by consistently suppressing possible sources of error when evaluating the sensor signals.
  • sources of error should therefore be suppressed consistently, which could arise over a longer period of time if the sensor is used for a long time, for example in a motor vehicle .
  • Such sources of error include, in particular, electrical resistances which are added when the respective sensor is connected to the assigned evaluation unit, which could systematically falsify the sensor signal supplied to the evaluation unit over time.
  • Such electrical resistances that set in over time can result in additional serial resistances as a result of deteriorating contacting of the sensor, for example due to corrosion or resistances connected in parallel on the signal side, through parasitic current paths to other plug contacts or insulation problems that arise in the plug housing.
  • the sensor should be continuously monitored with regard to its connection to the evaluation unit and checked for proper functionality.
  • additional resistances which may distort the sensor signals, develop comparatively slowly in terms of time.
  • a particularly suitable criterion for the detection of such error sources is the time monitoring of characteristic sensor output signals. If a deviation of the characteristic sensor output signal from an expected signal value is determined, it can be concluded that the sensor has malfunctioned, so that consideration of the output signals supplied by the sensor for further evaluation can be suppressed in good time.
  • a longer-term signal deterioration is considered, which can occur e.g. B. results from series or parallel resistors.
  • a particularly simple and therefore cost-effective solution for this evaluation is to consider the time required to exceed or fall below two threshold values with a defined distance. 1, which is, for example, about 10 mA, is split into two thresholds 1 'and 3 (FIG. 2), the new thresholds in particular slightly above or slightly below the previously used threshold, e.g. B. at 9.3 mA and 10.7 A, are arranged.
  • the procedure can be expanded and refined by introducing additional thresholds. In this case, the system availability increases.
  • An output signal directly supplied by the sensor such as, for example, the amplitude of an output voltage or an output current, can be considered as a characteristic sensor output signal, the possible change over time of which is monitored.
  • the characteristic sensor output signal used for monitoring in particular in the event that a sensor output signal is present in the form of pulse signals, such as, for example, square-wave signals or sinusoidal signals, it is also advantageously possible to monitor the so-called edge steepness of the sensor output signal and with regard to a still tolerable deviation from an expected value be checked.
  • the slope of the rising and / or falling edge can be evaluated.
  • the rising edge can preferably be monitored by concluding that the sensor is malfunctioning if the sensor output signal does not exceed a predetermined threshold value for the duration of a normal pulse.
  • a malfunction of the sensor is preferably concluded if the sensor output signal does not fall below a predetermined threshold value for the duration of an ordinary pulse.
  • the characteristic sensor signal is therefore an edge time in these cases. This is based on the knowledge that a falsification of the sensor output signals due to the occurrence of the serial or parallel resistances mentioned can, in particular, be reflected in comparatively flat edge profiles, so that starting from the start of the Impulse the respective intended threshold value is reached later than intended.
  • the time is preferably determined using a signal filter.
  • a sensor output signal is only further processed in the electronic evaluation unit if it is considered to be permissible within a predetermined standard range or within an expected range Value range.
  • the sensor is advantageously a wheel speed sensor of a motor vehicle, the sensor preferably being designed as a 3-level sensor.
  • the above-mentioned object is achieved with a sensor signal input, which is followed by a number of comparators, which in turn are connected on the output side to an evaluation logic, with an error reporting module being connected to the evaluation logic.
  • the evaluation logic is preferably designed in such a way that if the temporal behavior of a characteristic sensor signal deviates from an expected temporal behavior of more than a predefinable tolerance threshold, a malfunction of the sensor is concluded.
  • the evaluation logic is preferably connected to a microprocessor system for controlling a motor vehicle brake controller.
  • the circuit arrangement consists of an n-bit A / D converter, in particular with subsequent digital filtering and evaluation. Digital filtering enables the suppression of interfering signal components that would otherwise trigger an error in an undesirable manner.
  • a first-order digital low-pass filter is particularly preferably used in the circuit arrangement according to the invention, which represents a particularly cost-effective solution.
  • the signal quality can preferably be further improved by an additional RS latch in the signal path which is fed to the brake control device.
  • a further possibility of achieving the goal according to the invention is, in principle, to implement signal tracking with an analog / digital converter with a corresponding circuit arrangement.
  • a circuit arrangement would be considerably more complex than the circuit arrangement with analog signal tracking preferred according to the invention.
  • the circuit arrangement according to the invention is particularly simple compared to other conceivable circuit arrangements for eliminating malfunctions in sensor transmission. For example, no flip-flops are required in the signal path.
  • a sensor input circuit such as, for. B. is described in the input WO 00/22441, expanded, an existing digital filter can be used particularly advantageously.
  • An embodiment of the invention is explained in more detail with reference to a drawing. In it show:
  • FIG. 1 shows a diagram with signal detection thresholds, as are present in a circuit arrangement known per se,
  • Fig. 3 shows an example of a circuit arrangement according to the invention.
  • the signal of a wheel speed sensor is evaluated by means of comparators, in which it is checked whether the signal is within a defined working range. If the sensor signal 2 is above threshold 1, an error signal is not yet generated; rather, this only happens when sensor signal 2 exceeds threshold 1 '. If the signal 2 'is below threshold 1 ", an error signal is also generated. As a result, it is recognized whether the input currents are too small or too large. In order not to arbitrarily report an error due to the given tolerances of the sensor and the processing electronics, the error detection thresholds are set at a sufficient distance from the typical output currents of the sensor.
  • the evaluation circuit is therefore insensitive to small disturbances at the input. However, there are also gray areas in which no error is displayed and a correct one Signal processing is no longer ensured. In an unfavorable case, it can happen that the system incorrectly detects a driving situation with wheel slip, and therefore ABS control is carried out. A corresponding situation arises, for example, when the sensor signal deteriorates to such an extent that the vehicle falls below threshold 1. In this case, no more impulse is transmitted, which corresponds to a stationary wheel (slip).
  • FIG. 3 an additional threshold 3 is provided in addition to the already existing threshold 1 ′ shown in FIG. 2.
  • Fig. 2 shows the corresponding circuit arrangement.
  • Signal 4 is the analog sensor signal that is present at the input of the brake control unit.
  • Current signal 4 is converted by current mirror 12 into a voltage signal which is fed to comparators 13 and 14 on the input side. The applied signal is then compared with two reference voltages. The outputs of the comparators are connected to two inputs of logic 7.
  • the circuit according to the invention is integrated in a chip of the brake control device.
  • Signal 5 is a digital signal which is present at output 6 of logic 7.
  • Signal 8 is present at output 10 of the logic and is supplied to digital filter 11.
  • Logic 7 is designed such that a signal pattern corresponding to signal 8 is generated as a function of the threshold crossing of signal 4 with respect to thresholds 1 'and 3.
  • Signal 9 is output at the output of the digital filter 11.
  • a high level of signal 9 corresponds to an error in the sensor signal.
  • the circuit uses the filter to determine the time it takes to pass the two thresholds. In the normal operating range, this time is determined by the slope of the sensor current edges. If this time is longer than a specified limit, an error in the sensor signal was detected. With the developed circuit - before the wheel signal is incorrectly evaluated - an error or the deterioration of the sensor signal is displayed.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Regulating Braking Force (AREA)

Abstract

Procédé permettant de faire fonctionner un capteur, en particulier un capteur de vitesse de rotation d'une roue, qui transmet des signaux de sortie de capteur à un dispositif d'évaluation électronique. L'objet de la présente invention est la production d'un capteur conçu pour posséder une fiabilité et une sécurité en matière d'erreurs particulièrement élevées lors de l'évaluation des signaux (2, 2') de capteur. A cet effet, le comportement temporel d'un signal (2, 2') de capteur caractéristique est surveillé et comparé à un comportement temporel attendu, un écart, dépassant un seuil de tolérance prédéterminé, entre le comportement temporel effectif et le comportement attendu permettant de conclure à une perturbation fonctionnelle du capteur.
EP03770937A 2002-09-11 2003-08-14 Procede permettant de faire fonctionner un capteur et dispositif d'evaluation permettant la mise en oeuvre dudit procede Ceased EP1583974A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10242466 2002-09-11
DE10242466 2002-09-11
PCT/EP2003/009048 WO2004034067A1 (fr) 2002-09-11 2003-08-14 Procede permettant de faire fonctionner un capteur et dispositif d'evaluation permettant la mise en oeuvre dudit procede

Publications (1)

Publication Number Publication Date
EP1583974A1 true EP1583974A1 (fr) 2005-10-12

Family

ID=32086829

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03770937A Ceased EP1583974A1 (fr) 2002-09-11 2003-08-14 Procede permettant de faire fonctionner un capteur et dispositif d'evaluation permettant la mise en oeuvre dudit procede

Country Status (3)

Country Link
EP (1) EP1583974A1 (fr)
DE (1) DE10393230D2 (fr)
WO (1) WO2004034067A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3855264A1 (fr) * 2020-01-21 2021-07-28 Sick Ag Procédé de vérification automatique du comportement d'une configuration d'un appareil

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000022441A1 (fr) * 1998-10-14 2000-04-20 Continental Teves Ag & Co. Ohg Procede et circuit de traitement de signaux pour un detecteur de mouvement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4337518C1 (de) * 1993-11-03 1995-04-27 Ifm Electronic Gmbh Verfahren zur Überwachung eines elektronischen Schaltgerätes
DE4444408A1 (de) * 1994-12-14 1996-06-20 Bosch Gmbh Robert Verfahren zur Fehlererkennung bei Drehzahlfühlern

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000022441A1 (fr) * 1998-10-14 2000-04-20 Continental Teves Ag & Co. Ohg Procede et circuit de traitement de signaux pour un detecteur de mouvement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2004034067A1 *

Also Published As

Publication number Publication date
WO2004034067A1 (fr) 2004-04-22
DE10393230D2 (de) 2005-09-29

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