DE10301734A1 - Circuit arrangement for the galvanic separation of two sensors in a motor vehicle brake system separates brake lining wear and wheel rotation sensors - Google Patents

Circuit arrangement for the galvanic separation of two sensors in a motor vehicle brake system separates brake lining wear and wheel rotation sensors

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Publication number
DE10301734A1
DE10301734A1 DE10301734A DE10301734A DE10301734A1 DE 10301734 A1 DE10301734 A1 DE 10301734A1 DE 10301734 A DE10301734 A DE 10301734A DE 10301734 A DE10301734 A DE 10301734A DE 10301734 A1 DE10301734 A1 DE 10301734A1
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Germany
Prior art keywords
sensor
wheel speed
circuit arrangement
sensors
wear
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Withdrawn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
DE10301734A
Other languages
German (de)
Inventor
Claudiu Kuehnreich
Patrick Schaefer
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
Priority to DE10301734A priority Critical patent/DE10301734A1/en
Publication of DE10301734A1 publication Critical patent/DE10301734A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • 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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • 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
    • 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
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/321—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration deceleration
    • B60T8/329—Systems characterised by their speed sensor arrangements
    • 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
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/88—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
    • B60T8/885—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means using electrical circuitry
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D66/02—Apparatus for indicating wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D66/02—Apparatus for indicating wear
    • F16D66/021—Apparatus for indicating wear using electrical detection or indication means
    • F16D66/026—Apparatus for indicating wear using electrical detection or indication means indicating different degrees of lining wear
    • F16D66/027—Sensors therefor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Braking Arrangements (AREA)

Abstract

A circuit for the galvanic separation of two sensors in a motor vehicle braking system comprises an electronic control, especially brake control, unit (5) connected to a wheel rotation sensor (2) via a digital intersection (13). The wheel sensor is electrically connected to, but galvanically separated from, a brake pad wear sensor (1).

Description

Die Erfindung betrifft eine Schaltungsanordnung zur galvanischen Trennung zweier Sensoren, insbesondere zur galvanischen Trennung zwischen einem Bremsbelagverschleißsensor und einem Raddrehzahlsensor in einem Kraftfahrzeug. The invention relates to a circuit arrangement for galvanic isolation of two sensors, especially for galvanic isolation between a brake pad wear sensor and a wheel speed sensor in a motor vehicle.

Aus der DE 100 62 839 A1 sind aktive ABS-Raddrehzahlsensorelemente bekannt, welche einen Zusatzeingang zur Übertragung von zusätzlichen Signalen neben dem primär zu übertragenden Raddrehzahlsignal aufweisen. Die Raddrehzahlsensorelemente weisen hierzu einen zusätzlichen Eingangspin zur Erfassung von Digitalsignalen auf, der zum Anschluss von Bremsbelagverschleißsensoren verwendet werden kann. DE 100 62 839 A1 are active ABS wheel speed sensor elements are known which have an additional input for Transmission of additional signals in addition to the primary have transmitted wheel speed signal. The For this purpose, wheel speed sensor elements have an additional input pin Acquisition of digital signals on which to connect Brake pad wear sensors can be used.

Es hat sich gezeigt, dass es bei der Übertragung des Signals über den Bremsbelagverschleiß zur Bildung von Masseschleifen über die Karosserie kommen kann, welche die Funktion des ABS-Systems beeinträchtigen können. Die erfindungsgemäße Lösung soll Störungen, die von Masseschleifen hervorgerufen werden, vermeiden. It has been shown that it is in the transmission of the signal via the brake pad wear to form ground loops can come over the body, which the function of the ABS system can affect. The invention The solution is to malfunctions caused by ground loops will avoid.

Nach der Erfindung wird der Bremsbelagverschleiß unter Nutzung eines Zusatzkanals eines an sich bekannten Raddrehzahlsensors detektiert, wobei eine Einrichtung zur galvanischen Trennung des Raddrehzahlsensors und des Stromkreises des Bremsbelagverschleißsensors vorgesehen ist. According to the invention, the brake pad wear is reduced Use of an additional channel of a known one Wheel speed sensor detected, with a device for galvanic Separation of the wheel speed sensor and the circuit of the Brake pad wear sensor is provided.

Die Einrichtung zur galvanischen Trennung umfasst vorzugsweise mindestens einen Kondensator und/oder mindestens einen Transformator. Bei einer galvanischen Trennung mittels Kondensatoren erfolgt die Trennung zweckmäßigerweise durch Einsatz von genau zwei Kondensatoren. Diese Lösung erfordert eine gepulste Spannung. The device for electrical isolation includes preferably at least one capacitor and / or at least one Transformer. With a galvanic isolation by means of Capacitors are expediently separated by Use of exactly two capacitors. This solution requires a pulsed tension.

Die Einrichtung umfasst eine mit einem Verschleißsensor verbundene elektrische Leitung, die zu einer ersten Wicklung eines Transformators führt. Eine zweite Wicklung des Transformators führt unmittelbar oder mittelbar zu einem zusätzlichen Eingang eines Raddrehzahlsensors. Diese Lösung setzt einen gepulsten Strom voraus. Als Transformator bzw. Impulsübertrager lassen sich insbesondere handelsübliche stromkompensierte Drosseln einsetzen, welche besonders kostengünstig sind. The device includes one with a wear sensor connected electrical line leading to a first winding of a transformer. A second winding of the Transformer leads directly or indirectly to one additional input of a wheel speed sensor. This solution sets a pulsed current ahead. As a transformer or Pulse transformers can be commercially available in particular use current-compensated chokes, which are special are inexpensive.

Ein weiteres wesentliches Element der Erfindung ist, dass bevorzugt ein durch den Raddrehzahlsensor bereitgestelltes Wechselsignal zur Ansteuerung des Transformators bzw. der Kondensatoren genutzt wird. Dies bietet den Vorteil, dass keine zusätzlichen Schaltungsmittel zur Erzeugung eines Wechselsignals benötigt werden. Another essential element of the invention is that preferably one provided by the wheel speed sensor Alternating signal to control the transformer or Capacitors is used. This has the advantage that no additional circuit means for generating a Alternating signal are required.

Weitere bevorzugte Ausführungsformen ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung eines Ausführungsbeispiels an Hand von Figuren. Further preferred embodiments result from the Subclaims and the following description of a Embodiment based on figures.

Es zeigen Show it

Fig. 1 Bremsbelagverschleißsensor, Fig. 1 brake pad wear sensor,

Fig. 2 Bremsbelag mit eingebautem Bremsbelagverschleißsensor, Fig. 2 brake pad incorporating a brake lining wear sensor,

Fig. 3 eine an sich bekannte Anordnung zur Bremsbelagverschleißerkennung, Fig. 3 a known arrangement for brake lining wear detection,

Fig. 4 eine vereinfachte Darstellung der Schaltung eines beispielhaften aktiven Sensors, Fig. 4 is a simplified illustration of the circuit of an exemplary active sensor,

Fig. 5 ein Beispiel zur Erläuterung von Masseschleifen und Fig. 5 shows an example for explaining ground loops and

Fig. 6 eine Schaltungsanordnung mit galvanischer Trennung durch einen Impulsübertrager. Fig. 6 shows a circuit arrangement with electrical isolation by a pulse transformer.

Ein bevorzugter Bremsbelagverschleißsensor ist in den Fig. 1 und 2 dargestellt. Dieser besteht aus einem verdrillten Anschlusskabel 7, welches mittels einer sogenannten Pille 1 in einen Bremsbelag 6 eingebettet werden kann (Fig. 2) und mit einem Verschleißelement 9 verbunden ist. Dieses Verschleißelement 9 ist vorzugsweise als ein verdrillter Draht ausgeführt. Das andere Ende des Anschlusskabels 7 ist mit Verbindungsstecker 12 verbunden. Mit zunehmendem Belagverschleiß wird das elektrisch leitfähige Verschleißelement 9 von der Bremsscheibe abgeschmirgelt, so dass sich dessen Widerstand von nahezu 0 Ohm auf 300 Ohm bis idealerweise ∞ erhöht. A preferred brake pad wear sensor is shown in FIGS. 1 and 2. This consists of a twisted connecting cable 7 , which can be embedded in a brake pad 6 by means of a pill 1 ( FIG. 2) and is connected to a wear element 9 . This wear element 9 is preferably designed as a twisted wire. The other end of the connecting cable 7 is connected to the connector 12 . With increasing lining wear, the electrically conductive wear element 9 is sanded off the brake disc, so that its resistance increases from almost 0 ohms to 300 ohms to ideally ∞.

In den Fig. 3 und 4 ist dargestellt, wie ein Bremsbelagverschleißsensor üblicherweise an einen Raddrehzahlsensor 2 mit Zusatzeingang 10 (z. B. Philips, OH221/223, KMI 22) angeschlossen wird. Die Raddrehzahl wird mittels der Stromimpulse 20 an ein elektronisches Bremsensteuergerät 5 über die Sensorleitungen 11 übertragen. Diagramm 13 zeigt das Datenprotokoll von Sensor 2. Der Abstand der Stromimpulse 20 ist ein Maß für die Geschwindigkeit des Rades. Zwischen den Raddrehzahlimpulsen werden einzelne Zusatzdaten 4 in Form von Stromimpulsen mit geringerer Amplitude übertragen. Eine erste Leitung des Bremsbelagverschleißsensors (Pille) ist mit dem digitalen Eingang des Raddrehzahlsensors verbunden. Ein zweiter Anschluss ist an den Anschluss des Raddrehzahlsensors geführt, welcher das Bezugspotential (Vminus) der Datenschnittstelle führt. Gemeinsam mit den Raddrehzahlimpulsen wird der Status des Zusatzeingangs an der zweiten Bitposition (3) im Zwischenraum der Raddrehzahlimpulse übertragen. In FIGS. 3 and 4 is shown how a brake lining wear sensor is connected commonly to a wheel speed sensor 2 with auxiliary input 10 (for. Example, Philips, OH221 / 223, KMI 22). The wheel speed is transmitted by means of the current pulses 20 to an electronic brake control device 5 via the sensor lines 11 . Diagram 13 shows the data log of sensor 2 . The distance between the current pulses 20 is a measure of the speed of the wheel. Individual additional data 4 in the form of current pulses with a lower amplitude are transmitted between the wheel speed pulses. A first line of the brake pad wear sensor (pill) is connected to the digital input of the wheel speed sensor. A second connection is made to the connection of the wheel speed sensor, which carries the reference potential (Vminus) of the data interface. The status of the additional input at the second bit position ( 3 ) in the space between the wheel speed pulses is transmitted together with the wheel speed pulses.

An Hand von Fig. 5 werden nun Nachteile der Schaltungsanordnung in den Fig. 3 und 4 aufgeführt, die überwiegend auf die besonders schwierigen Umgebungsbedingungen im Betrieb eines Kraftfahrzeuges zurückzuführen sind. Der obige Bremsbelagverschleißsensor besteht im wesentlichen aus einem schlaufenförmigen Draht, welcher in einer sogenannten Pille verläuft. Kommt ein Teil des Drahtes in der Pille mit dem elektrischen Potential der Bremsscheibe (Fahrzeugmasse) in Berührung, so kann sich bei vielen Fahrzeugtypen eine Erdschleife ausbilden, welche zu einer Störung der Signalübertragung führen kann. Dieses Problem wird dadurch verursacht, dass bei vielen Fahrzeugen die Bremsscheibe leitend mit der Karosserie bzw. Fahrzeugmasse verbunden ist, so dass sich zwischen Sensor und ECU, welche ebenfalls mit der Karosserie verbunden ist, eine Masseschleife ausbildet. Dies führt zu:

  • - Einer erhöhten Empfindlichkeit gegen elektromagnetische Störfelder. Dadurch können ggf. kundenspezifische EMV- Anforderungen nicht erfüllt werden.
  • - Potentialunterschiede in der Karosserie können zu einem Stromfluss in der Masseleitung führen, wodurch das Sensorsignal die Funktion der ECU bzw. daran angeschlossene ESP- Sensoren gestört oder gar zerstört werden können.
With reference to FIG. 5 drawbacks are now the circuit arrangement shown in Figs. 3 and 4 shown, which are mainly due to the particularly severe environment conditions in the operation of a motor vehicle. The above brake pad wear sensor essentially consists of a loop-shaped wire which runs in a so-called pill. If part of the wire in the pill comes into contact with the electrical potential of the brake disc (vehicle earth), an earth loop can form in many vehicle types, which can lead to a fault in the signal transmission. This problem is caused by the fact that in many vehicles the brake disc is conductively connected to the body or vehicle mass, so that a ground loop is formed between the sensor and the ECU, which is also connected to the body. This leads to:
  • - An increased sensitivity to electromagnetic interference fields. This means that customer-specific EMC requirements may not be met.
  • - Potential differences in the body can lead to a current flow in the ground line, as a result of which the sensor signal can disrupt or even destroy the function of the ECU or the ESP sensors connected to it.

Prinzipiell kann die am Ausgang des Raddrehzahlsensors anliegende Spannung zur Ansteuerung des kapazitiven Mittels zur galvanischen Trennung dienen. Da allerdings die zur Verfügung stehende Spannung meist für eine zuverlässige kapazitive Ankoppelung des Belagverschleißsensors zu gering ist, wird nach der Erfindung eine transformatorische Trennung unter Nutzung des gepulsten Stromsignals am Sensorausgang, wie in Fig. 6 dargestellt, besonders bevorzugt. In principle, the voltage applied to the output of the wheel speed sensor can serve to control the capacitive means for electrical isolation. However, since the available voltage is usually too low for a reliable capacitive coupling of the lining wear sensor, a transformer separation using the pulsed current signal at the sensor output, as shown in FIG. 6, is particularly preferred according to the invention.

Es ist besonders zweckmäßig, wenn zur Verschleißerkennung der Strom eines Impulses 20 (Diagramm in Fig. 3) für die Radgeschwindigkeitsübertragung, wie in Patentanmeldung DE 100 62 839 A1 beschrieben, genutzt wird. Daher fließt durch den Bremsbelagverschleißsensor kein kontinuierlicher Strom, sondern lediglich Impulse, mit einer Länge von ca. 50 µs bei einer Stromstärke von etwa 28 mA. Da in der bereits bekannten Anordnung ein gepulster Strom vorliegt, kann bei einer entsprechenden Schaltungsanordnung eine galvanische Trennung besonders einfach dadurch erfolgen, dass in die Leitungen zwischen Raddrehzahlsensor 2 und Bremsbelagverschleißsensor 1 ein Transformator 21 geschaltet wird. Zur Optimierung des EMV-Verhaltens der Schaltung können weitere passive Bauelemente vorgesehen sein. It is particularly expedient if the current of a pulse 20 (diagram in FIG. 3) is used for wheel speed transmission, as described in patent application DE 100 62 839 A1, for wear detection. Therefore, no continuous current flows through the brake pad wear sensor, but only pulses with a length of approx. 50 µs at a current of approx. 28 mA. Since a pulsed current is present in the already known arrangement, galvanic isolation can be carried out particularly simply in a corresponding circuit arrangement in that a transformer 21 is connected in the lines between the wheel speed sensor 2 and the brake pad wear sensor 1 . Additional passive components can be provided to optimize the EMC behavior of the circuit.

Ein weiterer Vorteil des Impulsübertragers besteht darin, dass durch die Wahl des Übertragungsverhältnisses die Impedanz der Pille genau an den Schaltpunkt des Sensors angepasst werden kann. Dies ermöglicht den Einsatz von Verschleißsensoren mit unterschiedlichen Widerstandswerten ohne Modifikation des Sensor-ICs. Another advantage of the pulse transmitter is that that by choosing the transfer ratio Impedance of the pill exactly at the switching point of the sensor can be customized. This enables the use of Wear sensors with different resistance values without Modification of the sensor IC.

Claims (6)

1. Schaltungsanordnung zur galvanischen Trennung zweier Sensoren umfassend ein elektronisches Steuergerät (5), insbesondere ein elektronisches Bremsensteuergerät, welches mit mindestens einem aktiven Raddrehzahlsensor (2) über eine digitale Stromschnittstelle (13) verbunden ist, wobei der Raddrehzahlsensor über elektrische Leitungen mit einem diesem zugeordneten Bremsbelagver"- schleißsensor (1) verbunden ist, dadurch gekennzeichnet, dass zwischen dem Raddrehzahlsensor (2) und dem Bremsbelagverschleißsensor (1) eine Einrichtung zur galvanischen Trennung (21) geschaltet ist. 1. Circuit arrangement for the electrical isolation of two sensors, comprising an electronic control unit ( 5 ), in particular an electronic brake control unit, which is connected to at least one active wheel speed sensor ( 2 ) via a digital current interface ( 13 ), the wheel speed sensor being connected via electrical lines to one associated with the latter Bremsbelagver "- is connected schleißsensor (1) characterized in that between the wheel speed sensor (2) and the brake lining wear sensor (1) means is connected for galvanic separation (21). 2. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Einrichtung zur galvanischen Trennung (21) mindestens einen Transformator und/oder mindestens einen Kondensator umfasst. 2. Circuit arrangement according to claim 1, characterized in that the device for electrical isolation ( 21 ) comprises at least one transformer and / or at least one capacitor. 3. Schaltungsanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Strom, mit dem der Bremsbelagverschleißsensor (1) gespeist wird, dem Raddrehzahlsensor (2) und/oder dessen Zuleitung entnommen wird. 3. Circuit arrangement according to claim 1 or 2, characterized in that the current with which the brake pad wear sensor ( 1 ) is fed is taken from the wheel speed sensor ( 2 ) and / or its feed line. 4. Schaltungsanordnung nach mindestens einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Strom, mit dem der Bremsbelagverschleißsensor (1) gespeist wird, durch den Raddrehzahlsensor (2) periodisch verändert wird. 4. Circuit arrangement according to at least one of the preceding claims, characterized in that the current with which the brake pad wear sensor ( 1 ) is fed is changed periodically by the wheel speed sensor ( 2 ). 5. Schaltungsanordnung nach mindestens einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Bremsbelagverschleißsensor (1) den Grad des Verschleißes des Bremsbelags (6) erkennt. 5. A circuit arrangement according to at least one of the preceding claims, characterized in that the brake lining wear sensor (1) detects the degree of wear of the brake lining (6). 6. Schaltungsanordnung nach Anspruch 5, dadurch gekennzeichnet, dass der aktive Raddrehzahlsensor (2) eine Einrichtung umfasst, welche das verschleißabhängige Widerstandssignal des Bremsbelagverschleißsensors (1) digital codiert und in Form von Zusatzdaten zwischen Raddrehzahlimpulsen an das Steuergerät (5) überträgt. 6. Circuit arrangement according to claim 5, characterized in that the active wheel speed sensor ( 2 ) comprises a device which digitally encodes the wear-dependent resistance signal of the brake pad wear sensor ( 1 ) and transmits it to the control unit ( 5 ) in the form of additional data between wheel speed pulses.
DE10301734A 2002-02-20 2003-01-18 Circuit arrangement for the galvanic separation of two sensors in a motor vehicle brake system separates brake lining wear and wheel rotation sensors Withdrawn DE10301734A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE10301734A DE10301734A1 (en) 2002-02-20 2003-01-18 Circuit arrangement for the galvanic separation of two sensors in a motor vehicle brake system separates brake lining wear and wheel rotation sensors

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10207150 2002-02-20
DE10301734A DE10301734A1 (en) 2002-02-20 2003-01-18 Circuit arrangement for the galvanic separation of two sensors in a motor vehicle brake system separates brake lining wear and wheel rotation sensors

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004028509A1 (en) * 2003-12-04 2005-07-07 Continental Teves Ag & Co. Ohg Transmitting measured signals of braking pressure to measurement unit with controller in vehicle, employs current interface in connection between them
DE102006050216A1 (en) * 2005-11-17 2007-05-24 Continental Teves Ag & Co. Ohg Arrangement for displaying brake lining wear in motor vehicle, comprises two brake lining wear sensors such that two brake lining wear sensors are attached in different depth within brake linings
DE102007052285A1 (en) * 2007-11-02 2009-05-14 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Device for detecting a maximum permissible state of wear of brake linings in friction brakes of a rail vehicle
EP2630386B1 (en) 2010-10-20 2016-07-27 Wabco Radbremsen GmbH Brake lining wear indicator, disc brake having such an indicator and brake shoes for such a disc brake
DE102009013290B4 (en) * 2009-03-14 2017-03-16 Audi Ag Brake device with a worn brake pad

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004028509A1 (en) * 2003-12-04 2005-07-07 Continental Teves Ag & Co. Ohg Transmitting measured signals of braking pressure to measurement unit with controller in vehicle, employs current interface in connection between them
DE102006050216A1 (en) * 2005-11-17 2007-05-24 Continental Teves Ag & Co. Ohg Arrangement for displaying brake lining wear in motor vehicle, comprises two brake lining wear sensors such that two brake lining wear sensors are attached in different depth within brake linings
DE102007052285A1 (en) * 2007-11-02 2009-05-14 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Device for detecting a maximum permissible state of wear of brake linings in friction brakes of a rail vehicle
EP2055982A3 (en) * 2007-11-02 2011-01-05 KNORR-BREMSE Systeme für Schienenfahrzeuge GmbH Device to detect the maximum permitted wear status of brake covers in friction brakes on a railway vehicle
DE102007052285B4 (en) * 2007-11-02 2012-04-12 Knorr-Bremse Systeme für Schienenfahrzeuge GmbH Device for detecting a maximum permissible state of wear of brake linings
DE102009013290B4 (en) * 2009-03-14 2017-03-16 Audi Ag Brake device with a worn brake pad
EP2630386B1 (en) 2010-10-20 2016-07-27 Wabco Radbremsen GmbH Brake lining wear indicator, disc brake having such an indicator and brake shoes for such a disc brake
EP2630386B2 (en) † 2010-10-20 2019-12-04 Wabco Radbremsen GmbH Brake lining wear indicator, disc brake having such an indicator and brake shoes for such a disc brake

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