WO1993003937A1 - Procede et dispositif pour la surveillance d'un entrainement - Google Patents

Procede et dispositif pour la surveillance d'un entrainement Download PDF

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Publication number
WO1993003937A1
WO1993003937A1 PCT/DE1992/000646 DE9200646W WO9303937A1 WO 1993003937 A1 WO1993003937 A1 WO 1993003937A1 DE 9200646 W DE9200646 W DE 9200646W WO 9303937 A1 WO9303937 A1 WO 9303937A1
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WO
WIPO (PCT)
Prior art keywords
signal
threshold
speed
speed signal
driven
Prior art date
Application number
PCT/DE1992/000646
Other languages
German (de)
English (en)
Inventor
Rudolf Heinz
Heins-Erdam Bollhagen
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO1993003937A1 publication Critical patent/WO1993003937A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3225—Cooling devices using compression characterised by safety arrangements, e.g. compressor anti-seizure means or by signalling devices

Definitions

  • the invention is based on a method and a device for monitoring a drive, which contains at least one part that can be driven via at least one drive belt, according to the type of claims 1 and 6.
  • Such monitoring of an air conditioning compressor is known from EP-A 0 045 933, which is driven by an internal combustion engine via a belt.
  • the compressor speed detected by a speed sensor is converted into an electrical voltage, which is compared with a predetermined threshold.
  • the predetermined threshold is set to a value which is below the idling speed of the internal combustion engine. A drop in the speed of the compressor during operation below this threshold is recognized as an error state. If an error occurs, the compressor can be disconnected from the belt drive by opening an electromagnetic clutch. A slip occurring between the internal combustion engine and the compressor, which lies within the normal speed range of the internal combustion engine, is not recognized as an error state.
  • the invention is based on the object of specifying a method and a device for monitoring a drive which contains at least one part which can be driven via at least one drive belt and in which slip can be detected with simple means.
  • the method according to the invention has the advantage that the evaluation of a change in speed with respect to a threshold, which is tracked as a function of the speed signal, already makes it possible to recognize a beginning or an irregular slip between the driving and the driven part.
  • the method according to the invention therefore also makes it possible to recognize the beginning destruction of a drive belt.
  • the method is suitable for recognizing the beginning destruction of a toothed belt, in which individual rib breaks lead to brief slippage.
  • Threshold tracking ensures that the monitoring is carried out regardless of the current speed.
  • the method according to the invention is particularly suitable for monitoring parts which are driven by an internal combustion engine which is arranged, for example, in a motor vehicle.
  • Compressors for an air conditioning system or for a compressed air system, water pumps or generators, for example, are provided as driven parts.
  • the method according to the invention is particularly simple to apply to parts which emit a signal from which their speed can be determined. Such parts are, for example, generators which offer different possibilities of signal derivation for determining the speed.
  • the threshold with which the instantaneous speed is compared can be tracked by a moving averaging of the speed signal.
  • a more precise tracking is possible by time-limiting the averaging to speed values that have occurred in the past. This time provided for averaging is advantageously determined as a function of the current speed.
  • An advantageous development provides that an error signal is only triggered after the threshold has been exceeded a number of times within a predetermined time. With this measure, unnecessary error messages are avoided, which could occur, for example, due to unavoidable changes in the speed of the drive. It is also advantageous here to specify the time as a function of the current speed. _ ⁇ .
  • the device according to the invention for carrying out the method preferably contains a frequency demodulator for converting the speed signal into an analog voltage.
  • Means for tracking the threshold and for comparing can then be implemented using simple analog technology.
  • a low-pass filter circuit is suitable, for example, for threshold tracking.
  • the frequency demodulator can be omitted.
  • the evaluation is then preferably contained in a computer circuit, which may be preceded by a circuit for processing the speed signal emitted by the driven part.
  • An advantageous further development provides for the use of a charge control display in the dashboard of a motor vehicle to output the error signal.
  • the figure shows a block diagram of a device which is based on a method according to the invention for monitoring a drive.
  • a drive belt 10 is shown, via which a part 11 is driven by a driving part, not shown.
  • Belt 10 interacts with a disk 12 which is firmly connected to an electromagnetic clutch.
  • the clutch 13 can
  • the part 11 contains a speed sensor 14, which outputs a signal 15 to a signal conditioning circuit 16.
  • the circuit 16 outputs a processed speed signal 17 to means 18 for comparing the processed speed signal 17 with a threshold 19, to means 20 for tracking the threshold and to a first and second timer 21, 22.
  • a signal 23 emitted by the first timer 21. is fed to the means 20 for tracking the threshold 19.
  • a signal 24 emitted by the second timer 22 is fed to means 25 for counting the signals 26 emitted by the means 18.
  • the counting means 25 emit an error signal 27, which is fed to a warning device 28 and the electromagnetic clutch 13.
  • the drive belt 10 transmits the drive power applied by the driving part, not shown, via the disk 12 and the electromagnetic clutch to the part 11 to be driven.
  • the part 11 emits the signal 15, which must be provided by the speed sensor 14 if necessary.
  • the speed signal 15 reaches the signal processing circuit 16, which outputs the processed speed signal 17 to the further arrangement 18, 20, 21, 22.
  • the circuit 16 is implemented, for example, as a frequency demodulator, which preferably contains a phase locked loop.
  • This configuration of the circuit 16 converts the speed signal 15 into the processed speed signal 17 as an analog voltage.
  • This voltage is compared in the comparison means 18 with the threshold 19, which the tracking means 20 provides.
  • a simple implementation of the means 20 is provided with a low-pass filter circuit, the limit frequency of which is adapted to the desired tracking speed.
  • the averaging can also be done in a known manner by integrating the processed speed signal 17. It is particularly advantageous if the integration time is predetermined to a value by the signal 23 of the first timer 21. It is also advantageous here if this predetermined time depends on the current speed.
  • the comparison means 18 compare the processed speed signal 17 with the threshold 19 and emit a signal 26 to the counter 25 after each exceeding, each counting signal advancing the counter 25.
  • the comparison means 18 are preferably provided with a switching hysteresis in order to increase the security against interference signals.
  • the counter 25 sums the individual threshold violations within a predetermined time, which is determined by the signal 24 of the second timer 22. This time is preferably dependent on the current speed signal.
  • the particular advantage of this measure lies in the fact that speed changes which lead to a threshold being exceeded do not always trigger an error signal 27.
  • Such threshold violations can occur, for example, in the case of desired changes in the number of revolutions of the driving part (not shown in the figure) or, for example, by intended load changes in the driven part 11 or other driven parts. Load changes occur, for example, to an increased extent in the case of energy requirements for generators or in the case of energy requirements for compressors.
  • the timer 22 is preferably implemented as a frequency divider, which divides the signal frequency of the speed signal 15 emitted directly by the part 11 down to a predeterminable value and, with the divided signal 24, resets the counter 25 to an initial position each time.
  • the error signal 27 actuates, for example, the warning device 28, which can contain an acoustic and / or optical signal device. Furthermore, the error signal 27 releases the rigid connection between the pulley 12 and the driven part by releasing the electromagnetic clutch 13. With this measure, for example, a damaged part 11, which represents a load that is above the nominal value, can be separated from the drive belt 10. Such damage is the seizure of compressor shafts, for example.
  • the electromagnetic clutch 13 is not required for generators. In the event of reported speed fluctuations, a defective belt 10 is assumed which has greater slip in the area of damage.
  • the signal conditioning circuit 16 forms clean square-wave pulses from the speed signal 15 as a processed speed signal 17.
  • the means 18 for comparing and the means 20 for tracking the threshold 19 as well as the timers 21, 22 and the counter 25 are particularly simple as software in a computer circuit can be implemented. In a program sequence, the moving averaging taking place in the means 20 is particularly simple as a function of the signal 23.
  • the speed sensor 14 shown in the figure is only required for parts 11 which do not emit a signal from which a signal proportional to the speed can be derived.
  • the sensor 14 is not necessary because there are usually several taps for a signal from which the speed can be derived.
  • alternating voltage generators which emit electrical energy contain on the one hand in its output signal and, on the other hand, signals from which the speed can be derived within a possibly existing controller.
  • the charge indicator of the electrical vehicle electrical system present there can be used as a warning device 28.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

Il est proposé un procédé et un dispositif pour sa réalisation en vue de la surveillance d'un entraînement contenant un élément (11) entraîné par une courroie d'entraînement (10). La vitesse de rotation de cet élément (11) est mesurée, comparée avec un seuil (19) déterminé en fonction du signal de vitesse (15, 17), et lors du dépassement du seuil (19), un signal d'erreur (27) est émis. Le procédé selon l'invention et le dispositif pour sa réalisation permettent la détection d'un glissement naissant ou irrégulier entre un élément entraînant et l'élément entraîné (11), lequel peut être causé par exemple par le début de la détérioration de la courroie d'entraînement (10).
PCT/DE1992/000646 1991-08-21 1992-08-04 Procede et dispositif pour la surveillance d'un entrainement WO1993003937A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4127635A DE4127635A1 (de) 1991-08-21 1991-08-21 Verfahren und vorrichtung zum ueberwachen eines antriebes
DEP4127635.3 1991-08-21

Publications (1)

Publication Number Publication Date
WO1993003937A1 true WO1993003937A1 (fr) 1993-03-04

Family

ID=6438742

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1992/000646 WO1993003937A1 (fr) 1991-08-21 1992-08-04 Procede et dispositif pour la surveillance d'un entrainement

Country Status (2)

Country Link
DE (1) DE4127635A1 (fr)
WO (1) WO1993003937A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010025798B4 (de) * 2009-07-06 2014-05-08 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verfahren und Vorrichtung zum Schätzen eines Schlupfs eines Kraftfahrzeuglichtmaschinenriemens

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4318707A1 (de) * 1993-06-04 1994-12-08 Sihi Gmbh & Co Kg Verdrängermaschine mit elektronischer Motorsynchronisation
DE9401758U1 (de) * 1994-02-03 1994-03-17 Sigma Laborzentrifugen Gmbh Zentrifuge
DE10220616A1 (de) * 2002-05-08 2003-11-27 Webasto Thermosysteme Gmbh Verfahren und System zum Überwachen einer Klimaanlage für ein Kraftfahrzeug
FR2848631B1 (fr) * 2002-12-17 2005-12-16 Peugeot Citroen Automobiles Sa Systeme de diagnostic de l'etat d'un mecanisme de raccordement
US8903598B2 (en) * 2013-04-18 2014-12-02 Chrysler Group Llc Techniques for detecting supercharger belt slip
DE102020200118A1 (de) 2020-01-08 2021-07-08 Volkswagen Aktiengesellschaft Verfahren zur Detektion eines kritischen Zustands bei einem Kältemittelkreislauf eines Fahrzeuges

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045933A1 (fr) * 1980-08-09 1982-02-17 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Dispositif de contrôle de la force d'entraînement appliquée à un compresseur
US4510899A (en) * 1979-09-17 1985-04-16 Muncie Power Product Inc. Electronic overspeed switch
JPS60215419A (ja) * 1985-03-06 1985-10-28 Hitachi Ltd 自動車の空気調和装置用圧縮機駆動部の保護装置
US4697091A (en) * 1984-07-05 1987-09-29 Sanden Corporation Slip detecting device for a prime mover
JPS6317111A (ja) * 1986-07-10 1988-01-25 Matsushita Electric Ind Co Ltd 車両用空気調和機のベルト保護装置

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DD136192A1 (de) * 1978-05-24 1979-06-20 Heinz Grosch Nachlaufeinrichtung fuer eine automatische fernbedienung,insbesondere von schiffsdieselmotoren
DE3203820A1 (de) * 1982-02-04 1983-08-18 Ruhrkohle Ag, 4300 Essen Verfahren und anordnung zur ueberlastsicherung von maschinen, insbesondere von gewinnungs- und foerderanlagen des bergbaus
DE3513937A1 (de) * 1985-04-18 1986-10-23 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur ueberwachung eines drehzahlgeber-signals
FR2605110B1 (fr) * 1986-10-14 1989-04-28 Equip Electr Moteurs Dispositif de detection du glissement de la courroie d'entrainement d'une machine generatrice electrique entrainee par un moteur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510899A (en) * 1979-09-17 1985-04-16 Muncie Power Product Inc. Electronic overspeed switch
EP0045933A1 (fr) * 1980-08-09 1982-02-17 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Dispositif de contrôle de la force d'entraînement appliquée à un compresseur
US4697091A (en) * 1984-07-05 1987-09-29 Sanden Corporation Slip detecting device for a prime mover
JPS60215419A (ja) * 1985-03-06 1985-10-28 Hitachi Ltd 自動車の空気調和装置用圧縮機駆動部の保護装置
JPS6317111A (ja) * 1986-07-10 1988-01-25 Matsushita Electric Ind Co Ltd 車両用空気調和機のベルト保護装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 73 (M-463)(2130) 22. März 1986 & JP,A,60 215 419 ( HITACHI ) 28. Oktober 1985 *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 218 (M-711)(3065) 22. Juni 1988 & JP,A,63 017 111 ( MATSUSHITA ) 25. Januar 1988 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010025798B4 (de) * 2009-07-06 2014-05-08 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Verfahren und Vorrichtung zum Schätzen eines Schlupfs eines Kraftfahrzeuglichtmaschinenriemens

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