US20080073161A1 - Sensor System - Google Patents
Sensor System Download PDFInfo
- Publication number
- US20080073161A1 US20080073161A1 US11/952,725 US95272507A US2008073161A1 US 20080073161 A1 US20080073161 A1 US 20080073161A1 US 95272507 A US95272507 A US 95272507A US 2008073161 A1 US2008073161 A1 US 2008073161A1
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- United States
- Prior art keywords
- sensor
- brake
- sensor system
- wear
- lining material
- 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.)
- Abandoned
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Classifications
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- 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
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
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- 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
- F16D65/00—Parts or details
- F16D65/38—Slack adjusters
- F16D65/40—Slack adjusters mechanical
- F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
- F16D65/56—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut
- F16D65/567—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut for mounting on a disc brake
- F16D65/568—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut for mounting on a disc brake for synchronous adjustment of actuators arranged in parallel
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- 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
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- 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
- F16D2066/005—Force, torque, stress or strain
Definitions
- the present invention concerns a sensor system for monitoring the wear of lining material of a disc brake and possibly further conditions of the disc brake.
- the invention is primarily developed for disc brakes for heavy-duty road vehicles, but a person skilled in the art realises that it may be used for any kind of vehicle.
- the sensor system is intended for use at both pneumatically, hydraulically and electromechanically actuated brakes. Sensors monitoring the wear of the brake lining material are often referred to as pad wear sensors (PWS).
- PWS pad wear sensors
- the known sensors operate in two different ways for monitoring wear of brake linings.
- the first way is to use a sensor that measures directly on the brake lining.
- the second way is to use a sensor that monitors the position or movement of a part indicative of the wear of the brake linings.
- the present invention concerns a sensor element monitoring the position of a part, indicative of the wear of the brake linings.
- the wear of the brake disc(s) and possible lining material of the brake disc(s) are included in the sensed wear.
- the wear of the brake disc(s) as such is normally negligible compared to the wear of the lining material.
- the wear is normally stated in reference to the brake lining material, which is the normal usage in the art.
- the wear of the disc(s) is included in general expressions regarding wear in this description.
- Disc brakes are generally of two different types, which are referred to as disc brakes having a fixed caliper or a floating caliper.
- the present invention is applicable for both the above types of disc brakes.
- the sensor system according to the present invention is normally to be applied in connection with an adjustment shaft.
- the adjustment shaft is a part of an adjustment mechanism, used to control the position of the brake pads in relation to the brake disc(s), as is well known in the art.
- the position of the brake pads in relation to the brake disc(s) is automatically adjusted, by means of the adjustment mechanism.
- the amount of rotation of the adjustment shaft or adjusting spindle is correlated to the distance the adjuster mechanism advances the brake pads towards the brake disc(s).
- the rotation of the adjustment shaft is an indicator of the wear of the brake pads of the disc brake.
- the adjustment mechanism When worn brake pads are to be replaced by new brake pads, the adjustment mechanism, and thus, the adjustment shaft, is brought back to a starting position. This is done to give room for the new thicker brake pads.
- the starting position is dependent on the thickness of the brake disc(s) and is due to the wear of the disc(s). Thus, the starting point could be used to monitor the wear of the brake disc(s).
- a sensor system for monitoring at least the wear of lining material of disc brakes is provided.
- the position of an adjusting mechanism, a thrust plate or the like is used as an indication of the wear of lining material.
- the sensor system is mainly mounted in a way to use a caliper of the disc brake as a measuring reference and internal and/or external means are arranged indicating at least two different conditions of the brake.
- a method for monitoring disc brakes is provided, sensing the position of an adjusting mechanism, a thrust plate or the like.
- the sensed position is used optionally and alternately to measure either the wear of the brake lining material or the stroke of the brake actuation.
- the expression “stroke” is used in a broad sense, the measurements received are normally a combination of the actual stroke, elasticity and running clearance. It is possible to calculate the contribution of the different parts of the received signal, but it takes some computing capacity. Often it is enough to get an estimation of the stroke as such without an analysis of the different parts of the received signal.
- “stroke” normally also includes elasticity, running clearance and possible other contributions.
- One principle of the present invention is that the sensor system is designed to monitor two different conditions of the brake. One of said conditions is whether a braking is occurring. The other of said conditions is the actual position of the adjusting spindle or the like of the brake. In one example of an embodiment according to the invention a first and a second signal are given to the sensor system.
- the means controlling if braking is occurring may more or less have the function of an on-off switch or the like, it may also be a logic circuit using any suitable algorithm to establish the possible occurrence of a brake movement.
- the means monitoring the actual position of the adjusting spindle may have many different forms, but is some kind of sensor means. Throughout this description the means controlling if braking is occurring is normally called the first means and the sensor monitoring the position of the adjusting spindle or the like is normally called the second sensor means.
- the first means may be part of the sensor system as such or may be an external means.
- the first means of the sensor system is internal and/or external.
- the first means is normally connected directly or indirectly to the lever arm. During braking the lever arm is moved and the position of the lever arm is an indication of whether the brake is actuated or not.
- the first means may be replaced by an existing means of the vehicle indicative of the occurrence of braking.
- the first means is the control and monitoring system of the vehicle.
- the sensor system as such includes no first means.
- the first means may also be an algorithm in a logic circuit.
- the logic circuit may use any information available to establish if a brake movement is occurring or not.
- the information used by the logic circuit is for example given by the second sensor means, by existing signals in the control and monitoring system of the vehicle etc.
- the logic circuit may also use the latest available information.
- the second sensor means is normally functioning in a linear fashion, i.e. it detects a linear movement.
- a predetermined position or point for a part of the adjuster mechanism or the like in relation to another part of the brake is established.
- Said predetermined or predefined position is used as a fixed point or reference for measurement and is usually related to the caliper.
- the fixed point is normally the position when the brake is in the released condition but the fixed point could be any point during a brake movement.
- the first means could be used to establish the fixed point. If the fixed position is not confirmed it is taken as an indication that a braking is occurring.
- the measurement of the position of the adjusting spindle and thus the wear of the brake pad is taken at the fixed position all the time. Thus, measurements are only accepted when and if the two moving parts are at the predetermined fixed positions relative each other.
- the value of the detected wear is stored in a memory.
- the memory is updated with every new measuring cycle.
- the value stored in the memory is always accessible for the control and monitoring system of the vehicle and, thus, for the driver.
- the movement of the adjusting mechanism gives an indication of how well the brake is functioning.
- By using the signals from the second sensor means during an actual braking it is possible to analyse the function of the brake or if any part of the brake is broken. It is also possible to check that the brake is actually moving when braking is requested. E.g. it is possible to check the stroke, including running clearance and elasticity, of the brake actuation as indicated above.
- the term “adjusting spindle” is normally used.
- the sensor system may be used on any part of the adjusting mechanism, the thrust plate etc. or any other part, the position of which is an indication of the wear of the brake lining.
- the position of the sensor system is taken in relation to the caliper.
- the caliper is used as a measuring reference.
- the second sensor means may have many different forms, as long as it monitors the position of the adjusting spindle or the like. Many different types of sensors are previously known.
- FIG. 1 is a perspective view, partly cut-away of a brake mechanism enclosing a first embodiment of the sensor system according to the present invention
- FIG. 2 is a view corresponding to FIG. 1 of a second embodiment of the present invention.
- FIG. 3 is one example of a flow chart for a sensor system according to the present invention.
- FIG. 4 is a flow chart of one possible measuring cycle using the present invention.
- the sensor system of the present invention is arranged in connection with a brake mechanism of a disc brake.
- the brake mechanism comprises a lever arm 1 , which is manipulated by a brake cylinder or other actuator to actuate a braking.
- a holder 2 is fixed to the lever arm 1 .
- the holder 2 holds a magnet 3 .
- the holder 2 has a curvature form.
- the lever arm 1 is in its rest position, i.e. no braking is occurring, the magnet 3 of the holder 2 is placed adjacent and opposite a first means 4 , being a sensor.
- the first means 4 is a Hall effect sensor.
- the Hall effect sensor is received on a printed circuit board (electronic card) 5 .
- the printed circuit board 5 holds the logic for the Hall effect sensor.
- the sensor system of FIG. 1 further comprises a second sensor means, which in this case is a force sensor 6 , monitoring the position of the adjusting mechanism.
- the position of the adjusting mechanism is an indication of the wear of the brake lining material of the brake pads.
- the first sensor means 4 is used to validate or invalidate the signal of the second sensor means 6 for monitoring the wear.
- Said fixed position is the position of the lever arm 1 , when the magnet 3 is in position adjacent and opposite the first sensor 4 .
- the first sensor means 4 indicates that the lever arm 1 is in the correct position for measurements the signals of the second sensor means 6 is validated and may be displayed and stored.
- the fixed position is normally taken as the position when the brake is released.
- the sensor system is mainly mounted in the caliper of the disc brake.
- the magnet 3 and holder 2 is mounted together with the brake mechanism.
- the rest of the sensor system is received on a cap 11 to be fixed to the caliper, normally by means of just one screw received in a threaded opening of the caliper.
- the cap 11 is fixed to the caliper the values of the second sensor means 6 are in relation to the cap 11 and, thus, to the caliper.
- the caliper gives a fixed point to which the signals of the second sensor means 6 are related.
- the caliper is a measuring reference.
- the magnet has the form of a magnetic washer 10 and is mounted on a part of the adjusting means, which rotates when the lever arm 1 moves.
- the magnetic washer 10 is moved axially when the lever arm 1 moves.
- the magnet washer 10 is positioned adjacent and opposite a first means 4 , being a sensor.
- the first means 4 is a Hall effect sensor, received on a printed circuit board (electronic card) 5 .
- the second sensor means is a Hall effect sensor 7 , received inside a magnetic tube 9 .
- the magnetic tube 9 is placed inside the adjusting mechanism.
- the Hall effect sensor 7 is received inside the magnetic tube 9 without any physical contact with the magnetic tube 9 .
- the exact position of the second sensor means 7 inside the tube 9 is used to monitor the wear of the lining material of the brake pads. It may also be used to monitor other conditions of the brake.
- the first sensor means 4 is used to validate or invalidate the measurements of the second sensor means regarding wear of the brake lining material.
- the sensor system is mainly received on a cap 11 to be fixed to the caliper.
- the value of the second sensor means 7 is in relation to the cap 11 and, thus, the caliper.
- first means and the second sensor means of the sensor system may vary.
- the main conditions are that the first means should be able to function more or less as an on-off switch, while the second sensor means should be able to establish the exact position for a key part.
- sensors based on light, sound etc. or mechanical sensors, electrical transducers or GMR sensors etc. may be used.
- the second sensor means is shown as a device moving inside a tube or the like, a person skilled in the art realises that the second sensor means may have many different forms. For example it is possible to have a fixed part in the middle surrounded by a moveable part.
- the signals of the second sensor means may be used to monitor a braking stroke of the brake mechanism, if a first signal is received indicating that braking is occurring.
- the sensor system is normally software controlled.
- a person skilled in the art realises that the sensor system of the present invention may be used with any type of communication between the different parts and with any suitable type of signals.
- the normally used lines communication by means of radio, light etc. may be used. It is also possible to use both digital and analogous signals.
- the sensor system may have its own power supply.
- the first means is used to establish a fixed point for measurements.
- Said fixed point is normally at the rest position of the lever arm 1 , but it may be positioned anywhere along the way of movement of the lever arm 1 .
- the wear of the lining material may be calculated based on the movements sensed by the second sensor.
- a logic circuit or already available signals from an existing control and monitoring system of the vehicle to indicate if the brake is in a released position or not. If a logic circuit is used or existing signals are available no first means is needed in the sensor system as such.
- One example of the function of the sensor system according to the present invention is as follows and as indicated in FIG. 3 .
- a first signal is received either from the first means of the sensor system or from an external means indicative of the occurrence or braking. If the first signal confirms that the brake is in the predefined fixed position, the stored value is compared with the new value from the second sensor means. The memory is updated with the new value if there is a difference to the previously stored value.
- a power backup may be used in order to get a new value from the second sensor means.
- the power backup is optional and is normally only used for systems that are powering up the sensors during the brake application.
- the value of the second sensor means is compared with the stored value. If there is a difference the memory is updated with the new value.
- the stored value of the memory is always accessible for the control and monitoring system of the vehicle and, thus, for the driver.
- FIG. 4 an example of a measuring cycle is shown measuring the stroke of the brake actuation as well as the wear of the brake lining material.
- the sensors are powered up.
- the values of the second sensor means are read as the stroke of the brake actuation.
- the values of the second sensor are read as the wear of the lining material.
- the memory is updated with the latest read value of wear if there is a difference to the stored value.
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- General Engineering & Computer Science (AREA)
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Abstract
The present invention concerns a sensor system for monitoring at least the wear of lining material of a disc brake. It may also be used to monitor the stroke of the brake actuator. The sensor system uses the position of an adjusting mechanism or a thrust plate as an indication of the wear of the lining material. The sensor system is mounted in a way to use a caliper of the disc brake as a measuring reference. The sensor system comprises a memory arranged to receive a value of the detected wear and comprises a logic circuit arranged to indicate if the brake is in a released position or not.
Description
- This application is a divisional of U.S. patent application Ser. No. 11/301,683 filed Dec. 13, 2005, which in turn is a is a continuation of International Patent Application No. PCT/SE2004/000939 filed on Jun. 14, 2004, which designates the United States and claims priority of Swedish Patent Application No. 0301727-4 filed on Jun. 13, 2003. All prior applications are herein incorporated by reference.
- The present invention concerns a sensor system for monitoring the wear of lining material of a disc brake and possibly further conditions of the disc brake. The invention is primarily developed for disc brakes for heavy-duty road vehicles, but a person skilled in the art realises that it may be used for any kind of vehicle. The sensor system is intended for use at both pneumatically, hydraulically and electromechanically actuated brakes. Sensors monitoring the wear of the brake lining material are often referred to as pad wear sensors (PWS).
- Several different types of indicators or sensors for monitoring the wear of the brake lining of a brake pad or the like are known. In principle the known sensors operate in two different ways for monitoring wear of brake linings. The first way is to use a sensor that measures directly on the brake lining. The second way is to use a sensor that monitors the position or movement of a part indicative of the wear of the brake linings. The present invention concerns a sensor element monitoring the position of a part, indicative of the wear of the brake linings. It should be noted that in the latter case also the wear of the brake disc(s) and possible lining material of the brake disc(s) are included in the sensed wear. However, the wear of the brake disc(s) as such is normally negligible compared to the wear of the lining material. For simplicity of this description the wear is normally stated in reference to the brake lining material, which is the normal usage in the art. Thus, it is to be understood that also the wear of the disc(s) is included in general expressions regarding wear in this description.
- Disc brakes are generally of two different types, which are referred to as disc brakes having a fixed caliper or a floating caliper. The present invention is applicable for both the above types of disc brakes.
- The sensor system according to the present invention is normally to be applied in connection with an adjustment shaft. The adjustment shaft is a part of an adjustment mechanism, used to control the position of the brake pads in relation to the brake disc(s), as is well known in the art. As the lining of the brake pads wear off, the position of the brake pads in relation to the brake disc(s) is automatically adjusted, by means of the adjustment mechanism. Hereby the distance between the lining material and the brake disc(s) is kept more or less constant. The amount of rotation of the adjustment shaft or adjusting spindle is correlated to the distance the adjuster mechanism advances the brake pads towards the brake disc(s). Thus, the rotation of the adjustment shaft is an indicator of the wear of the brake pads of the disc brake.
- When worn brake pads are to be replaced by new brake pads, the adjustment mechanism, and thus, the adjustment shaft, is brought back to a starting position. This is done to give room for the new thicker brake pads. The starting position is dependent on the thickness of the brake disc(s) and is due to the wear of the disc(s). Thus, the starting point could be used to monitor the wear of the brake disc(s).
- According to the present invention a sensor system for monitoring at least the wear of lining material of disc brakes is provided. In the sensor system the position of an adjusting mechanism, a thrust plate or the like is used as an indication of the wear of lining material. The sensor system is mainly mounted in a way to use a caliper of the disc brake as a measuring reference and internal and/or external means are arranged indicating at least two different conditions of the brake.
- According to a second aspect of the present invention a method for monitoring disc brakes is provided, sensing the position of an adjusting mechanism, a thrust plate or the like. The sensed position is used optionally and alternately to measure either the wear of the brake lining material or the stroke of the brake actuation. In this description the expression “stroke” is used in a broad sense, the measurements received are normally a combination of the actual stroke, elasticity and running clearance. It is possible to calculate the contribution of the different parts of the received signal, but it takes some computing capacity. Often it is enough to get an estimation of the stroke as such without an analysis of the different parts of the received signal. As used here “stroke” normally also includes elasticity, running clearance and possible other contributions.
- One principle of the present invention is that the sensor system is designed to monitor two different conditions of the brake. One of said conditions is whether a braking is occurring. The other of said conditions is the actual position of the adjusting spindle or the like of the brake. In one example of an embodiment according to the invention a first and a second signal are given to the sensor system.
- The means controlling if braking is occurring may more or less have the function of an on-off switch or the like, it may also be a logic circuit using any suitable algorithm to establish the possible occurrence of a brake movement. The means monitoring the actual position of the adjusting spindle may have many different forms, but is some kind of sensor means. Throughout this description the means controlling if braking is occurring is normally called the first means and the sensor monitoring the position of the adjusting spindle or the like is normally called the second sensor means.
- The first means may be part of the sensor system as such or may be an external means. Thus, the first means of the sensor system is internal and/or external.
- The first means is normally connected directly or indirectly to the lever arm. During braking the lever arm is moved and the position of the lever arm is an indication of whether the brake is actuated or not. Depending on the control and monitoring system of the vehicle, the first means may be replaced by an existing means of the vehicle indicative of the occurrence of braking. Thus, in such a case the first means is the control and monitoring system of the vehicle. In this latter case the sensor system as such includes no first means. As indicated above the first means may also be an algorithm in a logic circuit. The logic circuit may use any information available to establish if a brake movement is occurring or not. The information used by the logic circuit is for example given by the second sensor means, by existing signals in the control and monitoring system of the vehicle etc. The logic circuit may also use the latest available information.
- The second sensor means is normally functioning in a linear fashion, i.e. it detects a linear movement.
- A predetermined position or point for a part of the adjuster mechanism or the like in relation to another part of the brake is established. Said predetermined or predefined position is used as a fixed point or reference for measurement and is usually related to the caliper. Furthermore, the fixed point is normally the position when the brake is in the released condition but the fixed point could be any point during a brake movement. The first means could be used to establish the fixed point. If the fixed position is not confirmed it is taken as an indication that a braking is occurring. The measurement of the position of the adjusting spindle and thus the wear of the brake pad is taken at the fixed position all the time. Thus, measurements are only accepted when and if the two moving parts are at the predetermined fixed positions relative each other.
- The value of the detected wear is stored in a memory. The memory is updated with every new measuring cycle. The value stored in the memory is always accessible for the control and monitoring system of the vehicle and, thus, for the driver.
- The movement of the adjusting mechanism gives an indication of how well the brake is functioning. By using the signals from the second sensor means during an actual braking it is possible to analyse the function of the brake or if any part of the brake is broken. It is also possible to check that the brake is actually moving when braking is requested. E.g. it is possible to check the stroke, including running clearance and elasticity, of the brake actuation as indicated above.
- To simplify the description the term “adjusting spindle” is normally used. However, the sensor system may be used on any part of the adjusting mechanism, the thrust plate etc. or any other part, the position of which is an indication of the wear of the brake lining. According to the present invention the position of the sensor system is taken in relation to the caliper. Thus, the caliper is used as a measuring reference.
- A person skilled in the art realises that the second sensor means may have many different forms, as long as it monitors the position of the adjusting spindle or the like. Many different types of sensors are previously known.
- Further objects and advantages of the present invention will be obvious for a person skilled in the art when reading the detailed description below of at present preferred embodiments.
- The invention will be described further below by way of examples and with reference to the enclosed drawings. In the drawings:
-
FIG. 1 is a perspective view, partly cut-away of a brake mechanism enclosing a first embodiment of the sensor system according to the present invention; -
FIG. 2 is a view corresponding toFIG. 1 of a second embodiment of the present invention; -
FIG. 3 is one example of a flow chart for a sensor system according to the present invention; and -
FIG. 4 is a flow chart of one possible measuring cycle using the present invention. - The sensor system of the present invention is arranged in connection with a brake mechanism of a disc brake. The brake mechanism comprises a lever arm 1, which is manipulated by a brake cylinder or other actuator to actuate a braking. In the embodiment of
FIG. 1 a holder 2 is fixed to the lever arm 1. Theholder 2 holds a magnet 3. In the shown embodiment theholder 2 has a curvature form. When the lever arm 1 is in its rest position, i.e. no braking is occurring, the magnet 3 of theholder 2 is placed adjacent and opposite a first means 4, being a sensor. In the embodiment ofFIG. 1 the first means 4 is a Hall effect sensor. The Hall effect sensor is received on a printed circuit board (electronic card) 5. The printed circuit board 5 holds the logic for the Hall effect sensor. - The sensor system of
FIG. 1 further comprises a second sensor means, which in this case is a force sensor 6, monitoring the position of the adjusting mechanism. The position of the adjusting mechanism is an indication of the wear of the brake lining material of the brake pads. The first sensor means 4 is used to validate or invalidate the signal of the second sensor means 6 for monitoring the wear. Furthermore, to have accurate and comparable measurements of the wear the measurements should be performed in one and the same fixed position for the adjusting mechanism. Said fixed position is the position of the lever arm 1, when the magnet 3 is in position adjacent and opposite the first sensor 4. Thus, when the first sensor means 4 indicates that the lever arm 1 is in the correct position for measurements the signals of the second sensor means 6 is validated and may be displayed and stored. The fixed position is normally taken as the position when the brake is released. - If and when the lever arm 1 moves the
holder 2 will move with it moving the magnet 3 out of the position opposite the first sensor means 4. Thereby the signals from the second sensor means 6 are invalidated considering wear until a confirmation is received that the brake is in the fixed position for measurement. - The sensor system is mainly mounted in the caliper of the disc brake. The magnet 3 and
holder 2 is mounted together with the brake mechanism. The rest of the sensor system is received on a cap 11 to be fixed to the caliper, normally by means of just one screw received in a threaded opening of the caliper. As the cap 11 is fixed to the caliper the values of the second sensor means 6 are in relation to the cap 11 and, thus, to the caliper. Expressed differently the caliper gives a fixed point to which the signals of the second sensor means 6 are related. Thus, the caliper is a measuring reference. - In the embodiment of
FIG. 2 parts corresponding to parts ofFIG. 1 are given the same reference signs. Here, the magnet has the form of amagnetic washer 10 and is mounted on a part of the adjusting means, which rotates when the lever arm 1 moves. Themagnetic washer 10 is moved axially when the lever arm 1 moves. In a predetermined position for the lever arm 1 themagnet washer 10 is positioned adjacent and opposite a first means 4, being a sensor. Also in this case the first means 4 is a Hall effect sensor, received on a printed circuit board (electronic card) 5. - In the embodiment of
FIG. 2 the second sensor means is aHall effect sensor 7, received inside a magnetic tube 9. The magnetic tube 9 is placed inside the adjusting mechanism. TheHall effect sensor 7 is received inside the magnetic tube 9 without any physical contact with the magnetic tube 9. The exact position of the second sensor means 7 inside the tube 9 is used to monitor the wear of the lining material of the brake pads. It may also be used to monitor other conditions of the brake. - The principles for the embodiment of
FIG. 2 correspond with the principles of the previous embodiment. Thus, the first sensor means 4 is used to validate or invalidate the measurements of the second sensor means regarding wear of the brake lining material. - The sensor system is mainly received on a cap 11 to be fixed to the caliper. As stated in relation to the embodiment of
FIG. 1 the value of the second sensor means 7 is in relation to the cap 11 and, thus, the caliper. - A person skilled in the art realises that the exact form of the first means and the second sensor means of the sensor system may vary. The main conditions are that the first means should be able to function more or less as an on-off switch, while the second sensor means should be able to establish the exact position for a key part. Instead of using magnets and Hall effect sensors, sensors based on light, sound etc. or mechanical sensors, electrical transducers or GMR sensors etc. may be used. Even though the second sensor means is shown as a device moving inside a tube or the like, a person skilled in the art realises that the second sensor means may have many different forms. For example it is possible to have a fixed part in the middle surrounded by a moveable part.
- Furthermore, the signals of the second sensor means may be used to monitor a braking stroke of the brake mechanism, if a first signal is received indicating that braking is occurring.
- The sensor system is normally software controlled. A person skilled in the art realises that the sensor system of the present invention may be used with any type of communication between the different parts and with any suitable type of signals. Thus, in addition to the normally used lines communication by means of radio, light etc. may be used. It is also possible to use both digital and analogous signals. Furthermore, the sensor system may have its own power supply.
- The first means is used to establish a fixed point for measurements. Said fixed point is normally at the rest position of the lever arm 1, but it may be positioned anywhere along the way of movement of the lever arm 1. As long as the measurements of the second sensor means is taken in the same position for the lever arm 1, the wear of the lining material may be calculated based on the movements sensed by the second sensor. As indicated above it is also possible to use a logic circuit or already available signals from an existing control and monitoring system of the vehicle to indicate if the brake is in a released position or not. If a logic circuit is used or existing signals are available no first means is needed in the sensor system as such.
- One example of the function of the sensor system according to the present invention is as follows and as indicated in
FIG. 3 . - When a brake lining wear indication is demanded a first signal is received either from the first means of the sensor system or from an external means indicative of the occurrence or braking. If the first signal confirms that the brake is in the predefined fixed position, the stored value is compared with the new value from the second sensor means. The memory is updated with the new value if there is a difference to the previously stored value.
- If the first signal indicates that the brake is not in the predefined fixed position, a power backup may be used in order to get a new value from the second sensor means. The power backup is optional and is normally only used for systems that are powering up the sensors during the brake application. When the first means or any other means indicates that the brake is in the predefined position, the value of the second sensor means is compared with the stored value. If there is a difference the memory is updated with the new value. The stored value of the memory is always accessible for the control and monitoring system of the vehicle and, thus, for the driver.
- In
FIG. 4 an example of a measuring cycle is shown measuring the stroke of the brake actuation as well as the wear of the brake lining material. When the start of a brake cycle is detected the sensors are powered up. During the brake cycle the values of the second sensor means are read as the stroke of the brake actuation. When the brake cycle is completed and the predefined fixed position is sensed, the values of the second sensor are read as the wear of the lining material. In correspondence with the flow chart ofFIG. 3 the memory is updated with the latest read value of wear if there is a difference to the stored value. - A person skilled in the art realises that the flow charts of the sensor system according to the present invention may be varied depending on the actual sensor means used and the information wanted.
Claims (16)
1. A sensor system for monitoring at least the wear of lining material of disc brakes, using the position of an adjusting mechanism or a thrust plate as an indication of the wear of the lining material, characterized in that the sensor system is mounted in a way to use a caliper of the disc brake as a measuring reference, that the sensor system comprises a memory arranged to receive a value of the detected wear, and that the sensor system comprises a logic circuit arranged to indicate if the brake is in a released position or not.
2. The sensor system of claim 1 , characterized in that it comprises a first sensor monitoring and giving a signal indicative of the occurrence of a brake movement.
3. The sensor system of claim 2 , characterized in that the first sensor is a part of the control and monitoring system of the vehicle.
4. The sensor system of claim 2 , characterized in that a fixed point for measurements is defined by the first sensor and/or that the first sensor comprises a sensing element using Hall effect for co-operation with a magnet.
5. The sensor system of claim 4 , characterized in that the magnet is received on a holder fixed to a lever arm of the brake mechanism and that the first sensor is received on a printed circuit board.
6. The sensor system of claim 4 , characterized in that the magnet is received on a rotating part of the adjusting mechanism and/or that the magnet has the form a magnetic washer moving axially in the adjusting mechanism.
7. The sensor system of claim 1 , characterized in that it comprises a second sensor monitoring and giving a signal indicative of the actual position of the part indicating the wear of the brake lining material.
8. The sensor system of claim 7 , characterized in that the logic circuit is using the second sensor.
9. The sensor system of claim 7 , characterized in that the second sensor is linear.
10. The sensor system of claim 9 , characterized in that the second sensor is a force sensor, a Hall effect sensor received on a printed circuit board a light sensor, a sound sensor, a mechanical sensor, an electrical transducer or a GMR sensor and/or that the second sensor co-operates with a magnetic tube placed inside the adjusting mechanism.
11. The sensor system of claim 7 , characterized in that the major part of the sensor system is received on a cap fixed to the caliper.
12. The sensor system of claim 1 , characterized in that the logic circuit uses an algorithm to establish the occurrence of a brake movement.
13. A method for monitoring at least the wear of lining material of disc brakes, comprising the steps of:
sensing the position of an adjustment mechanism or a thrust plate with a caliper as a measuring reference;
storing the value of detected wear in a memory;
indicating whether or not a brake is in a released condition with a logic circuit; and
determining if the brake is in a correct predetermined position for measuring wear based on the indication.
14. The method of claim 13 , further comprising the step of measuring either the wear of the brake lining material or the stroke of the brake actuation utilizing the step of sensing the position of the adjustment mechanism or the thrust plate.
15. The method of claim 14 , further comprising the steps of establishing whether a brake cycle has started or not and determining which type of measurement is possible at that moment.
16. The method of claim 14 , characterized in that a signal indicating the wear of the brake lining material is used to update the memory.
Priority Applications (1)
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PCT/SE2004/000939 WO2004111484A1 (en) | 2003-06-13 | 2004-06-14 | A sensor system for monitoring at least the wear of lining material of disc brakes |
US11/301,683 US7555375B2 (en) | 2003-06-13 | 2005-12-13 | Sensor system |
US11/952,725 US20080073161A1 (en) | 2003-06-13 | 2007-12-07 | Sensor System |
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EP (2) | EP1892435B8 (en) |
AT (2) | ATE428069T1 (en) |
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US20060149440A1 (en) * | 2003-06-13 | 2006-07-06 | Matti Pettersson | Sensor system |
US20090229926A1 (en) * | 2008-03-11 | 2009-09-17 | Craig Schaefer | Proximity sensor for brake wear detection |
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---|---|---|---|---|
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Citations (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3776329A (en) * | 1971-03-19 | 1973-12-04 | Self Energizing Disc Brakes Lt | Brake wear and adjustment device |
US4205603A (en) * | 1979-03-27 | 1980-06-03 | Aetna Industries, Inc. | Brake monitor for part-revolution mechanical power press |
US4280594A (en) * | 1979-07-17 | 1981-07-28 | Lucas Industries Limited | Brake wear indicator |
US4570736A (en) * | 1985-01-07 | 1986-02-18 | Ford Motor Company | Dual flow variable assist power steering gear mechanism |
US4606435A (en) * | 1984-09-10 | 1986-08-19 | General Motors Corporation | Brake lining wear sensor and indicator circuit |
US4677420A (en) * | 1985-02-04 | 1987-06-30 | Lucas Industries Public Limited Company | Wear indicator for friction linings |
US4681194A (en) * | 1985-03-28 | 1987-07-21 | Aisin Seiki Kabushiki Kaisha | Disc brake assembly with parking brake mechanism |
US4809824A (en) * | 1987-01-22 | 1989-03-07 | Bendix France | Method and device for actuating a braking mechanism by a rotating electric motor |
US4850454A (en) * | 1988-07-29 | 1989-07-25 | Allied-Signal Inc. | Disc brake lining wear sensor |
US4921076A (en) * | 1986-06-23 | 1990-05-01 | Wabco Westinghouse Equipements Ferroviaries | Vehicle park braking system |
US4992944A (en) * | 1986-01-30 | 1991-02-12 | Hitachi, Ltd. | Power steering control system |
US5009292A (en) * | 1989-05-19 | 1991-04-23 | General Motors Corporation | Mechanism and method of positive arcuate orientation of a first member and a second member, particularly for brake adjusted orientation of a drive member and a driven member in a disc brake assembly having parking brake mechanism |
US5161650A (en) * | 1991-05-22 | 1992-11-10 | Allied-Signal Inc. | Disc brake with powered integral parking mechanism |
US5207299A (en) * | 1990-06-05 | 1993-05-04 | Wabco Westinghouse Fahrzeugbremsen Gmbh | Brake slack adjuster with electronic control and distance sensors |
US5233528A (en) * | 1991-04-26 | 1993-08-03 | Allied-Signal Inc. | Braking by deceleration control |
US5848673A (en) * | 1996-01-11 | 1998-12-15 | Perrot Bremsen Gmbh | Wear monitoring apparatus for a disc brake |
US5848672A (en) * | 1994-06-08 | 1998-12-15 | Lucas Industries Public Limited Company | Brake lining wear sensing system |
US5934395A (en) * | 1995-10-18 | 1999-08-10 | Toyota Jidosha Kabushiki Kaisha | Hybrid vehicle drive system having two motor/generator units and engine starting means |
US6047793A (en) * | 1996-03-19 | 2000-04-11 | Komatsu Ltd. | Device for detecting abrasion of brake for vehicle |
US6105730A (en) * | 1995-06-08 | 2000-08-22 | Haldex Brake Products Ab | Brake lining wear indicating device |
US6255941B1 (en) * | 2000-02-24 | 2001-07-03 | Indian Head Industries, Inc. | Brake monitoring system |
US6257374B1 (en) * | 2000-08-18 | 2001-07-10 | Trw Inc. | Brake pad wear sensing system and method |
US6276494B1 (en) * | 1996-02-07 | 2001-08-21 | Arvinmeritor, Inc. | Brake wear sensor |
US6279690B1 (en) * | 1997-11-13 | 2001-08-28 | Robert Bosch Gmbh | Electro-mechanical brake system for a vehicle |
US6341670B1 (en) * | 1999-02-19 | 2002-01-29 | Rideau Bulk Ltd. | Brake wear managing system |
US6352137B1 (en) * | 2000-03-22 | 2002-03-05 | Indian Head Industries, Inc. | Brake monitoring system |
US6397977B1 (en) * | 1998-10-24 | 2002-06-04 | Meritor Heavy Vehicle Systems, Llc | Vehicle brake having brake de-adjust |
US20020075147A1 (en) * | 2000-02-24 | 2002-06-20 | Stonehocker Terry L. | Apparatus for assembly of brake monitor |
US20020104717A1 (en) * | 2001-02-08 | 2002-08-08 | Volvo Trucks North America, Inc. | Vehicle diagnostic system |
US20020104720A1 (en) * | 2001-02-08 | 2002-08-08 | Volvo Trucks North America, Inc. | Brake shoe proximity sensor |
US6497035B1 (en) * | 1999-12-06 | 2002-12-24 | Hr Textron, Inc. | Hall position sensor |
US20030084714A1 (en) * | 2001-11-02 | 2003-05-08 | Delphi Technologies Inc. | Electrical wear sensor for disc brake |
US6634465B1 (en) * | 1998-08-18 | 2003-10-21 | Tüschen & Zimmermann | Spring-loaded brake with wear indication |
US6722477B1 (en) * | 1999-09-23 | 2004-04-20 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Brake actuator |
US7032721B2 (en) * | 2001-11-16 | 2006-04-25 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Control method for controlling a resetting system of a disc brake and brake disc assembly |
US7182184B2 (en) * | 2001-04-26 | 2007-02-27 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Disk brake comprising an electric motor-driven wear adjusting system |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3010335C2 (en) * | 1980-03-18 | 1982-12-09 | Helmut 5600 Wuppertal Korthaus | Working method for an electromotive brake actuation device, in particular in rail vehicles, and device for carrying out the method |
DE3341182A1 (en) * | 1983-11-14 | 1985-05-30 | Siegerland-Bremsen Emde GmbH + Co, 6342 Haiger | Brake unit for spot-type disc brakes |
JPS6045539A (en) * | 1984-05-23 | 1985-03-12 | バスフ アクチェン ゲゼルシャフト | Manufacture of methanol |
FR2615259B1 (en) * | 1987-05-13 | 1989-12-08 | Carbone Ind | IMPROVED DISC FOR DISC BRAKE |
JPH0289826A (en) * | 1988-09-24 | 1990-03-29 | Mitsubishi Motors Corp | Disc brake device |
JPH07268922A (en) * | 1994-03-31 | 1995-10-17 | Sekisui House Ltd | Ventilation pipe unit incorporable into wall body |
JP2680293B2 (en) * | 1996-02-23 | 1997-11-19 | 株式会社日立製作所 | Data processing device and cache memory control method |
DE19637394C2 (en) * | 1996-09-13 | 1999-07-22 | Siemens Ag | Device for monitoring the brake pad thickness of a vehicle brake |
US5992579A (en) * | 1997-08-07 | 1999-11-30 | Meritor Heavy Vehicle Systems, Llc | Method and apparatus for detecting an improperly adjusted slack adjuster |
JPH11198795A (en) * | 1998-01-14 | 1999-07-27 | Nissin Kogyo Kk | Disk brake device for hydraulic vehicle |
EP0978665B1 (en) * | 1998-08-05 | 2004-06-09 | Freni Brembo S.p.A. | Device for indicating lining wear in floating caliper disc brakes |
US6273218B1 (en) * | 1998-11-03 | 2001-08-14 | Meritor Heavy Vehicle Systems, Llc | Vehicle brake system having a sensor to measure movement |
DE10062839A1 (en) * | 2000-07-06 | 2002-01-17 | Continental Teves Ag & Co Ohg | Arrangements and methods for the detection and transmission of sensor signals in motor vehicles, and sensor |
DE10036109C2 (en) * | 2000-07-25 | 2003-05-08 | Wabco Perrot Bremsen Gmbh | Monitoring device for a caliper disc brake |
EP1311773B1 (en) * | 2000-08-17 | 2006-11-22 | KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH | Disc brake comprising an adjusting system |
DE10214671B4 (en) * | 2002-04-03 | 2006-08-24 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Brake tensioning device with electrically operated Verschleißnachstell- and emergency and auxiliary release device |
DE10214669B4 (en) * | 2002-04-03 | 2014-01-23 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Method and device for controlling an electrically operated wear adjustment device |
SE526946C2 (en) * | 2003-06-13 | 2005-11-22 | Haldex Brake Prod Ab | Sensor system |
GB0324243D0 (en) * | 2003-10-16 | 2003-11-19 | Meritor Heavy Vehicle Braking | A control system and method for a disc brake |
GB0410659D0 (en) * | 2004-05-13 | 2004-06-16 | Meritor Heavy Vehicle Braking | Brake pad wear indicator |
-
2003
- 2003-06-13 SE SE0301727A patent/SE526946C2/en not_active IP Right Cessation
-
2004
- 2004-06-14 EP EP07120793A patent/EP1892435B8/en not_active Expired - Lifetime
- 2004-06-14 DE DE602004020468T patent/DE602004020468D1/en not_active Expired - Lifetime
- 2004-06-14 DE DE602004024142T patent/DE602004024142D1/en not_active Expired - Lifetime
- 2004-06-14 AT AT04748995T patent/ATE428069T1/en not_active IP Right Cessation
- 2004-06-14 AT AT07120793T patent/ATE448424T1/en not_active IP Right Cessation
- 2004-06-14 EP EP04748995A patent/EP1633992B1/en not_active Expired - Lifetime
- 2004-06-14 WO PCT/SE2004/000939 patent/WO2004111484A1/en active Search and Examination
-
2005
- 2005-12-13 US US11/301,683 patent/US7555375B2/en not_active Expired - Fee Related
-
2007
- 2007-12-07 US US11/952,725 patent/US20080073161A1/en not_active Abandoned
Patent Citations (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3776329A (en) * | 1971-03-19 | 1973-12-04 | Self Energizing Disc Brakes Lt | Brake wear and adjustment device |
US4205603A (en) * | 1979-03-27 | 1980-06-03 | Aetna Industries, Inc. | Brake monitor for part-revolution mechanical power press |
US4280594A (en) * | 1979-07-17 | 1981-07-28 | Lucas Industries Limited | Brake wear indicator |
US4606435A (en) * | 1984-09-10 | 1986-08-19 | General Motors Corporation | Brake lining wear sensor and indicator circuit |
US4570736A (en) * | 1985-01-07 | 1986-02-18 | Ford Motor Company | Dual flow variable assist power steering gear mechanism |
US4677420A (en) * | 1985-02-04 | 1987-06-30 | Lucas Industries Public Limited Company | Wear indicator for friction linings |
US4681194A (en) * | 1985-03-28 | 1987-07-21 | Aisin Seiki Kabushiki Kaisha | Disc brake assembly with parking brake mechanism |
US4992944A (en) * | 1986-01-30 | 1991-02-12 | Hitachi, Ltd. | Power steering control system |
US4921076A (en) * | 1986-06-23 | 1990-05-01 | Wabco Westinghouse Equipements Ferroviaries | Vehicle park braking system |
US4809824A (en) * | 1987-01-22 | 1989-03-07 | Bendix France | Method and device for actuating a braking mechanism by a rotating electric motor |
US4850454A (en) * | 1988-07-29 | 1989-07-25 | Allied-Signal Inc. | Disc brake lining wear sensor |
US5009292A (en) * | 1989-05-19 | 1991-04-23 | General Motors Corporation | Mechanism and method of positive arcuate orientation of a first member and a second member, particularly for brake adjusted orientation of a drive member and a driven member in a disc brake assembly having parking brake mechanism |
US5207299A (en) * | 1990-06-05 | 1993-05-04 | Wabco Westinghouse Fahrzeugbremsen Gmbh | Brake slack adjuster with electronic control and distance sensors |
US5233528A (en) * | 1991-04-26 | 1993-08-03 | Allied-Signal Inc. | Braking by deceleration control |
US5161650A (en) * | 1991-05-22 | 1992-11-10 | Allied-Signal Inc. | Disc brake with powered integral parking mechanism |
US5848672A (en) * | 1994-06-08 | 1998-12-15 | Lucas Industries Public Limited Company | Brake lining wear sensing system |
US6105730A (en) * | 1995-06-08 | 2000-08-22 | Haldex Brake Products Ab | Brake lining wear indicating device |
US5934395A (en) * | 1995-10-18 | 1999-08-10 | Toyota Jidosha Kabushiki Kaisha | Hybrid vehicle drive system having two motor/generator units and engine starting means |
US5848673A (en) * | 1996-01-11 | 1998-12-15 | Perrot Bremsen Gmbh | Wear monitoring apparatus for a disc brake |
US6276494B1 (en) * | 1996-02-07 | 2001-08-21 | Arvinmeritor, Inc. | Brake wear sensor |
US6047793A (en) * | 1996-03-19 | 2000-04-11 | Komatsu Ltd. | Device for detecting abrasion of brake for vehicle |
US6279690B1 (en) * | 1997-11-13 | 2001-08-28 | Robert Bosch Gmbh | Electro-mechanical brake system for a vehicle |
US6634465B1 (en) * | 1998-08-18 | 2003-10-21 | Tüschen & Zimmermann | Spring-loaded brake with wear indication |
US6397977B1 (en) * | 1998-10-24 | 2002-06-04 | Meritor Heavy Vehicle Systems, Llc | Vehicle brake having brake de-adjust |
US6341670B1 (en) * | 1999-02-19 | 2002-01-29 | Rideau Bulk Ltd. | Brake wear managing system |
US6722477B1 (en) * | 1999-09-23 | 2004-04-20 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Brake actuator |
US6497035B1 (en) * | 1999-12-06 | 2002-12-24 | Hr Textron, Inc. | Hall position sensor |
US6255941B1 (en) * | 2000-02-24 | 2001-07-03 | Indian Head Industries, Inc. | Brake monitoring system |
US20010030602A1 (en) * | 2000-02-24 | 2001-10-18 | Osterman Paul S. | Brake monitoring system |
US20020075147A1 (en) * | 2000-02-24 | 2002-06-20 | Stonehocker Terry L. | Apparatus for assembly of brake monitor |
US6417768B2 (en) * | 2000-02-24 | 2002-07-09 | Indian Head Industries, Inc. | Method of assembling a monitor on a brake actuator |
US20010035820A1 (en) * | 2000-02-24 | 2001-11-01 | Osterman Paul S. | Brake monitoring system |
US6480107B2 (en) * | 2000-02-24 | 2002-11-12 | Indian Head Industries, Inc. | Apparatus for assembly of brake monitor |
US6352137B1 (en) * | 2000-03-22 | 2002-03-05 | Indian Head Industries, Inc. | Brake monitoring system |
US6257374B1 (en) * | 2000-08-18 | 2001-07-10 | Trw Inc. | Brake pad wear sensing system and method |
US20020104720A1 (en) * | 2001-02-08 | 2002-08-08 | Volvo Trucks North America, Inc. | Brake shoe proximity sensor |
US20020104717A1 (en) * | 2001-02-08 | 2002-08-08 | Volvo Trucks North America, Inc. | Vehicle diagnostic system |
US20020195298A1 (en) * | 2001-02-08 | 2002-12-26 | Volvo Trucks North America, Inc. | Vehicle diagnostic system |
US7182184B2 (en) * | 2001-04-26 | 2007-02-27 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Disk brake comprising an electric motor-driven wear adjusting system |
US20030084714A1 (en) * | 2001-11-02 | 2003-05-08 | Delphi Technologies Inc. | Electrical wear sensor for disc brake |
US7032721B2 (en) * | 2001-11-16 | 2006-04-25 | Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh | Control method for controlling a resetting system of a disc brake and brake disc assembly |
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Also Published As
Publication number | Publication date |
---|---|
WO2004111484A1 (en) | 2004-12-23 |
EP1633992A1 (en) | 2006-03-15 |
DE602004024142D1 (en) | 2009-12-24 |
SE526946C2 (en) | 2005-11-22 |
ATE448424T1 (en) | 2009-11-15 |
EP1892435B8 (en) | 2010-05-26 |
ATE428069T1 (en) | 2009-04-15 |
SE0301727D0 (en) | 2003-06-13 |
EP1892435A1 (en) | 2008-02-27 |
US20060149440A1 (en) | 2006-07-06 |
EP1892435B1 (en) | 2009-11-11 |
US7555375B2 (en) | 2009-06-30 |
DE602004020468D1 (en) | 2009-05-20 |
SE0301727L (en) | 2004-12-14 |
EP1633992B1 (en) | 2009-04-08 |
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