WO1997027488A1 - Procede et circuit pour la detection d'erreurs dans un tachymetre - Google Patents

Procede et circuit pour la detection d'erreurs dans un tachymetre Download PDF

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Publication number
WO1997027488A1
WO1997027488A1 PCT/EP1997/000038 EP9700038W WO9727488A1 WO 1997027488 A1 WO1997027488 A1 WO 1997027488A1 EP 9700038 W EP9700038 W EP 9700038W WO 9727488 A1 WO9727488 A1 WO 9727488A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
signal
wheel
detection
error
Prior art date
Application number
PCT/EP1997/000038
Other languages
German (de)
English (en)
Inventor
Stefan Sommer
Norbert Ehmer
Original Assignee
Itt Automotive Europe 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 Itt Automotive Europe Gmbh filed Critical Itt Automotive Europe Gmbh
Publication of WO1997027488A1 publication Critical patent/WO1997027488A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
    • 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 monitoring a speed sensor or rotary motion sensor, which consists of a transducer rotating with the wheel that performs the rotary motion to be measured and a stationary transducer that delivers an output signal representing the rotary motion.
  • a circuit arrangement for carrying out the method is also part of the invention.
  • Such a monitoring method is required, for example, for motor vehicle control systems in which the signal measured with wheel speed sensors is the most important or even the sole input variable of the control system.
  • This includes Systems for anti-lock control (ABS) or traction control (ASR), systems for electronic control of the brake force distribution (EBV), for driving stability control (FSR, ASMS) and the like.
  • each vehicle wheel is usually equipped with a speed sensor.
  • a faulty sensor signal would at least result in a worsening of the control or could even lead to safety-critical situations.
  • Monitoring the sensor signal is therefore absolutely necessary in practice.
  • Methods and circuit arrangements are already known with which a sensor failure, a line interruption, sensor short circuit or the like can be ascertained. In principle, however, it is difficult to detect defects which are not due to the complete failure of the signal, but only to lead to a signal falsification.
  • Errors that result in a significant change in speed or a sudden change in the rotational speed calculated from the sensor signal can be recognized by plausibility criteria and can be distinguished from control-related signal changes because such sudden changes are not physically possible.
  • the invention is based on the object of developing a method for monitoring a speed sensor, with which mechanical defects, in particular bent or missing teeth or the signal changes caused by such errors, are also recognized and distinguished from control-related changes in the speed of rotation of the wheel can.
  • the presence of an error is only signaled when the brief signal changes or signal dips in a predetermined number of revolutions, e.g. B. occur in 10 consecutive wheel revolutions
  • the invention is therefore based on the knowledge that defects in the measured value acquisition or mechanical defects, such as bent or missing teeth of the transmitter, and the signal changes caused by such defects can be recognized and distinguished from speed changes if the signal changes typical of such defects and the repetition these signal changes are used for error detection after each full wheel revolution.
  • the detection is additionally secured by the fact that the presence of a defect is only signaled when the characteristic signal change occurs in a certain number of successive wheel revolutions. Erroneous error messages are avoided with high reliability.
  • the sensor monitoring according to the invention does not require any additional manufacturing outlay because it is based solely on the analysis of the sensor output signal or the speed signal. Defects not yet detectable are recognized. In addition, error detection works at relatively low speeds; it is independent of whether the speed calculation is based on the evaluation of the whole or half the number of teeth.
  • Show it 1 shows the typical behavior of the sensor output signal and the calculated wheel speed as a result of a tooth defect in the diagram
  • Circuit arrangement for error signaling after a predetermined number of characteristic signal changes occurring in succession is provided.
  • FIG. 1 schematically shows the output signal u (t) of a wheel sensor and the calculated speed v R (t) of this wheel.
  • the vehicle travels at a constant speed of 45 km / h; this is a speed calculation with the aid of a microcomputer or microcontroller system, which is operated at the work cycle of 7 ms.
  • the output signal u (t) of the sensor is approximately sinusoidal in the example shown, is a few volts and has an amplitude of + u 0 .
  • the trigger pulses namely those triggered by the teeth of the sensor, are shown by the sinusoidal output signal u (t) of the wheel sensor or the sensor of this sensor.
  • a sensor defect is noticeable in the time periods T lf T 2 or T, ', T /.
  • one or more bent or broken teeth are involved.
  • the sinusoidal output signal u (t) of the wheel sensor or sensor of this sensor is "deformed" due to the tooth defect.
  • these brief signal dips triggered by the tooth defect are repeated in the same form after a complete wheel revolution, for which approximately 140 ms are required according to the illustration (FIG. 1). From the characteristic signal drop and the return after each full wheel rotation, according to the invention, the presence of a sensor defect, in particular a bent or broken tooth, or several adjacent teeth, is inferred.
  • FIG. 2 shows qusi as a detail from FIG. 1 on an enlarged scale the course of the output voltage u (t) of the wheel sensor at a constant rotational speed of the wheel.
  • the response thresholds (trigger level) of the associated trigger circuit are entered in FIG. 2. Due to the tooth defect, four trigger pulses fail in the exemplary embodiment according to FIG. 2 because the amplitudes of the approximately sinusoidal output signal u (t) do not briefly reach the trigger thresholds due to the defect due to the defect. chen. Again, as shown in FIG. 1 and explained with reference to this FIG., This results in the brief drop in the calculated wheel speed signal v R (t).
  • the short-term drops in the sensor output signal and the wheel speed signal calculated therefrom only lead to error detection or signaling of a sensor defect if these drops are repeated several times in direct succession after each wheel revolution.
  • FIG. 3 illustrates the circuit arrangement according to FIG. 3, which can of course also be implemented by a corresponding computer program.
  • control systems of the type described here are preferably implemented on the basis of program-controlled circuits, such as microcomputers or microcontrollers, in which the speed calculation in the specified work cycle of e.g. 7 ms and repeated.
  • the wheel speed v " is calculated from the output signal u (t) of a wheel sensor or from its frequency in a circuit part or program part 1.
  • a sensor G in the form of a toothed disk and a sensor A are shown symbolically.
  • the analysis and checking is then carried out after periodic signal changes or signal dips that occur again after each wheel revolution.
  • a counter 3 which determines the number of full wheel revolutions, is started and, in addition, a monitoring window 4 is opened, which records the duration of the signal dips and thereby determines whether it is actually a short time , signal changes characteristic of tooth defects.
  • the monitoring window 4 is "opened” by the output signal of the circuit block 2 after each complete wheel revolution.
  • the output signal of the monitoring window 4 thus contains the information that the signal drop or signal change involved is a periodic, short-term fault characteristic of tooth defects. These periodically occurring errors, which are characteristic of tooth defects, are now counted in a second counter 5. In a subsequent subtractor 6, the number of directly consecutive periodic, characteristic error signals is compared with a number specified by a circuit 7; this number represents the required number of directly successive periodic fault signals which must be achieved in order for error detection to occur.
  • the suppression of disturbances that only occur a few times is solved by the subtractor 6, which gradually reduces the number K specified by the circuit 7 when the periodic errors occur after each rotation of the wheel until finally, symbolized by a branch 8, the reaching of the predetermined number K of successive errors is determined and "error detection" is signaled. With each no "N" at the output of branch 8, counter 3 is reset.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

Des variations momentanées ou des interruptions du signal de sortie du détecteur (u(t)) sont détectées et évaluées en vue de déterminer une erreur, afin de contrôler un capteur de régime (G, A) comportant un capteur de mesure (G) en forme de disque denté ou équivalent, tournant avec la roue, ainsi qu'un transducteur fixe (A). Si cette erreur apparaît sur un nombre prédéterminé (K) de tours de roue successifs, cela donne lieu à une 'détection d'erreur'.
PCT/EP1997/000038 1996-01-24 1997-01-08 Procede et circuit pour la detection d'erreurs dans un tachymetre WO1997027488A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996102359 DE19602359A1 (de) 1996-01-24 1996-01-24 Verfahren und Schaltungsanordnung zur Überwachung eines Drehzahlsensors
DE19602359.9 1996-01-24

Publications (1)

Publication Number Publication Date
WO1997027488A1 true WO1997027488A1 (fr) 1997-07-31

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/000038 WO1997027488A1 (fr) 1996-01-24 1997-01-08 Procede et circuit pour la detection d'erreurs dans un tachymetre

Country Status (2)

Country Link
DE (1) DE19602359A1 (fr)
WO (1) WO1997027488A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220402507A1 (en) * 2021-06-16 2022-12-22 Bendix Commercial Vehicle Systems Llc Direction detection using a wheel speed sensor and exciter ring

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DE19749791A1 (de) * 1997-11-11 1999-05-12 Wabco Gmbh Auswerteverfahren für ein Ausgangssignal einer eine zyklische Bewegung abtastenden Sensoreinrichtung
DE19820817C2 (de) * 1998-05-09 2001-09-13 Bosch Gmbh Robert Einrichtung zur Regelung einer mehrzylindrigen Brennkraftmaschine
DE10162599B4 (de) * 2001-12-20 2020-02-20 Robert Bosch Gmbh Verfahren und Vorrichtung zur Überwachung von Drehzahlfühlern auf fehlende Zähne
DE102004021928A1 (de) * 2004-05-04 2005-12-01 Krones Ag Prüfvorrichtung und Verfahren zur Prüfung der Funktionstüchtigkeit eines Drehimpulsgebers
DE102004043461B4 (de) * 2004-09-08 2008-04-10 Infineon Technologies Ag Signalaufbereitungsanordnung und Verfahren zum Aufbereiten eines Signals
DE102006021693B4 (de) * 2006-05-10 2010-11-04 Audi Ag Verfahren zur Plausibilisierung von Drehzahlinformationen
US8886471B2 (en) 2008-06-26 2014-11-11 Infineon Technologies Ag Rotation sensing method and system

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EP0584566A2 (fr) * 1992-08-17 1994-03-02 Robert Bosch Gmbh Procédé de détection du défaut dans l'analyse pour les signaux de sortie d'un détecteur de vitesse de rotation
US5476311A (en) * 1991-07-06 1995-12-19 Itt Automotive Europe Gmbh Circuit configuration for detecting wheel sensor malfunctions

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US3712130A (en) * 1970-10-30 1973-01-23 Gen Electric Detection of distributed defects in gear assemblies
DE3201811A1 (de) * 1982-01-21 1983-09-08 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur erfassung von drehzahl, winkel, lage
DE3743958A1 (de) * 1987-12-23 1989-07-13 Siemens Ag Messeinrichtung zur messung des drehverhaltens eines objekts in einem fahrzeug
US4972145A (en) * 1989-12-14 1990-11-20 American Standard Inc. Speed sensor gap fault-detection arrangement for multiple-axle rail vehicles
US5095269A (en) * 1990-05-25 1992-03-10 Eaton Corporation Speed sensor fault detection system and method

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US5476311A (en) * 1991-07-06 1995-12-19 Itt Automotive Europe Gmbh Circuit configuration for detecting wheel sensor malfunctions
EP0584566A2 (fr) * 1992-08-17 1994-03-02 Robert Bosch Gmbh Procédé de détection du défaut dans l'analyse pour les signaux de sortie d'un détecteur de vitesse de rotation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220402507A1 (en) * 2021-06-16 2022-12-22 Bendix Commercial Vehicle Systems Llc Direction detection using a wheel speed sensor and exciter ring
US11814055B2 (en) * 2021-06-16 2023-11-14 Bendix Commercial Vehicle Systems Llc Direction detection using a wheel speed sensor and exciter ring

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Publication number Publication date
DE19602359A1 (de) 1997-07-31

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