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WO2004110835A1 - Frein de stationnement a actionnement electromecanique pour des vehicules automobiles - Google Patents

Frein de stationnement a actionnement electromecanique pour des vehicules automobiles Download PDF

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Publication number
WO2004110835A1
WO2004110835A1 PCT/EP2004/051060 EP2004051060W WO2004110835A1 WO 2004110835 A1 WO2004110835 A1 WO 2004110835A1 EP 2004051060 W EP2004051060 W EP 2004051060W WO 2004110835 A1 WO2004110835 A1 WO 2004110835A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
force
parking brake
encoder
brake cable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2004/051060
Other languages
German (de)
English (en)
Inventor
Andreas Emmerich
Thomas Ewert
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
Priority claimed from DE102004025361A external-priority patent/DE102004025361A1/de
Application filed by Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of WO2004110835A1 publication Critical patent/WO2004110835A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • 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
    • B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
    • B60T11/04—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting mechanically
    • B60T11/046—Using cables
    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/746—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive and mechanical transmission of the braking action
    • 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
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/08—Brake-action initiating means for personal initiation hand actuated
    • B60T7/10—Disposition of hand control
    • B60T7/107—Disposition of hand control with electrical power assistance

Definitions

  • the present invention relates to an electromechanically actuated parking brake for motor vehicles, which essentially consists of at least one device for generating an application force, an electronic control unit and mechanically lockable braking devices on at least one axis, the braking devices being able to be applied by the device by means of at least one brake cable and Clamping force is determined by means of a force measuring device.
  • a parking brake system for vehicles is known from international application WO 98/56633, which has an actuating unit for generating an application force.
  • the application force is transmitted to an actuating cable via an actuator.
  • a force measuring device is integrated into the actuator in such a way that relative movements between the actuating cable and the actuator are detected. It is considered less advantageous in this parking brake system that the structure is complicated and that the production is complex.
  • the present invention is therefore based on the object of an electromechanically actuated parking brake to improve the type mentioned at the outset in such a way that the application force can be determined reliably by a simply constructed and cost-effectively implemented force measuring device.
  • the force measuring device consists of an encoder and at least one magnetoresistive sensor element, the part of the force measuring device being formed by the encoder.
  • a spring element or a rubber-elastic element is arranged downstream of the part.
  • a further advantageous development provides that the brake cable is designed in such a way that it allows mechanical deformation and has a hard magnetic effect which is detected by means of a magnetoresistive sensor element.
  • FIG. 1 shows a schematically illustrated circuit diagram of a hydraulic brake system which has an electromechanical actuating unit for carrying out parking brake operations, _ O _
  • FIG. 2a, b, c each show a schematically illustrated, only partially illustrated embodiment of a force measuring device for detecting the clamping force from the electromechanical actuating unit shown in FIG. 1,
  • Fig. 3a, b the embodiment shown in Fig. 2c with an untensioned and tensioned brake cable.
  • a circuit diagram of a hydraulic brake system is shown schematically.
  • the hydraulic brake system has wheel brakes 2 on a first axle, the front axle, which can be pressurized during service braking via a hydraulic line 20.
  • the wheels of the front axle are assigned wheel speed sensors 12, the output signals of which are fed to an electronic control and regulating unit (ECU) 5.
  • ECU electronic control and regulating unit
  • This electronic control unit 5 is assigned to the service brake system.
  • Wheel brakes 3 are also provided on a second axle, the rear axle, which can be pressurized during service braking via a second hydraulic line 10.
  • the wheel speeds of the wheels of the rear axle are determined by wheel speed sensors 13 and supplied to the electronic control unit 5 just mentioned.
  • the wheels of the rear axle can be braked by the wheel brakes 3 just mentioned as well as by an electromechanically actuated parking brake.
  • the electromechanically actuated parking brake has two mechanically lockable braking devices 4 on the rear axle, which are designed as drum brakes 4, each with an expansion lock (not shown in more detail).
  • the expansion locks just mentioned are by means of two brake cables 11 of one Electromechanical actuator 1 can be actuated, after which the drum brakes 4 are applied.
  • a parking brake operation is carried out after the operator has actuated an operating element 7.
  • the output signals of the operating element 7 are fed to an electronic control unit (ECU) 6 assigned to the electromechanical parking brake, which controls the already mentioned electromechanical actuating unit 1 accordingly.
  • ECU electronice control unit
  • a force measuring device 9 is necessary to determine the application force of the electromechanically actuated parking brake.
  • the force measuring device 9 consists of an encoder 14 and a fixed magneto-resistive sensor element 15.
  • the encoder 14, which consists of individual hard magnets joined together, is integrated into the brake cable in such a way that a transmission of the application force from the electromechanical control unit 1 to the drum brakes 4 of the rear axle via the encoder 14.
  • the electrical resistance of the magnetoresistive sensor element 15 changes when a magnetic field acts vertically on a current applied to the magnetoresistive sensor element 15. This changed electrical resistance in the magnetoresistive sensor element 15, which depends on the acting magnetic field and thus on the position of the encoder 14 relative to the magnetoresistive sensor element 15, is measured.
  • the force measuring device 9 is used to count the number of hard magnetic elements of the encoder 14 which are pulled past the magneto-resistive sensor element 15 which is attached in a stationary manner.
  • intermediate positions of the hard magnetic elements of the encoder 14 can also be determined.
  • a brake cable 11 normally used is not sufficiently elastic
  • a spring element 16 as shown in FIG. 2a, is integrated in the brake cable 11. The application force is transmitted from the electromechanical actuating unit 1 to the drum brakes 4 via the spring element 16.
  • the electromechanical actuating unit 1 pulls the brake cable 11 to the left in FIG. 2a in order to apply the drum brakes 4 to the rear axle, the application force is transmitted via the encoder 14 and the spring element 16 just described, spring element 16 being stretched. As a result, the encoder 14 is pulled past the magnetoresistive sensor element 15 and the position of the encoder 14 is determined relative to the magnetoresistive sensor element 15 which is attached in a stationary manner. The application force applied by the electromechanical actuating unit 1 is calculated from the position of the encoder 15 and the previously determined spring constants of the spring element 16.
  • FIG. 2b The embodiment shown in FIG. 2b is very similar to the force measuring device 9 described with reference to FIG. 2a. The only difference is that instead of the spring element 16, a rubber-elastic element 17 is integrated in the brake cable 11. When a clamping force is transmitted from the electromechanical actuating unit 1 to the drum brakes 4, the rubber-elastic element 17 is stretched and the encoder 14 is pulled past the magneto-resistive element 15 as already described with reference to FIG. 2a. If the elasticity of the rubber-elastic element 17 is determined beforehand, then in connection with the position of the encoder 14 relative to the fixed magneto-resistive element 16, that of the electromechanical element Actuator 1 applied clamping force can be determined.
  • the encoder 14 is dispensed with, since the brake cable 11 is designed such that it itself has a hard magnetic effect 24, which is shown schematically in FIG. 2c by the individual magnets 24.
  • the brake cable 11 allows mechanical deformation in this embodiment, so that additional elastic elements such as the spring element in FIG. 2a or the rubber-elastic element in FIG. 2b can be dispensed with.
  • the electromechanical control unit 1 transmits an application force to the drum brakes 4 of the rear axle, the brake cable undergoes a mechanical deformation in the form of an elongation.
  • a section of the brake cable 11 is pulled past the magneto-resistive sensor element 150 and since the brake cable 11 has a hard magnetic effect 24, as already mentioned, the position of the brake cable 11 can be determined relative to the magnetoresistive sensor element 150 which is attached in a fixed position. Together with the previously determined degree of mechanical deformation of the brake cable 11, which is composed of an elastic component and a plastic component caused by aging, this results in the application force applied by the electromechanical actuating unit 1.
  • FIG. 3a shows the force measuring device described with reference to FIG. 2c in a state in which no application force is applied by the electromechanical actuating unit 1 to the drum brakes 4 via the brake cable 11.
  • the individual magnets which are intended to schematically represent the hard magnetic effect 24 of the brake cable 11, are in this untensioned state the distance ⁇ 0 separated from each other. If the electromechanical actuating unit 1 now applies an application force via the brake cable 11 to the drum brakes 4, this expands
  • Brake cable 11 by the amount .DELTA.L and the distance between the individual magnets of the hard magnetic effect 24 is greater, as shown in Fig. 3b.
  • the distance between the individual magnets is then ⁇ i. This increase in the distance between the individual magnets or the expansion of the hard magnetic effect 24 of the brake cable 11 must be taken into account when calculating the application force.
  • the plastic deformation (elongation) of the brake cable 11 caused by aging can be determined with the arrangement shown in FIGS. 3a, 3b. If the electromechanical actuating unit 1 applies a clamping force via the brake cable 11, the distance ⁇ between the individual magnets of the hard magnetic effect 24 will increase with increasing aging of the brake cable 11. This change in the distance ⁇ of the individual magnets of the hard magnetic effect 24 caused by the aging of the brake cable 11 can be determined with the aid of the magneto-resistive sensor element 15 not shown in FIG. 3b and from which the elastic deformation which transmits the application force can be subtracted.
  • the application force of an electromechanical actuating unit 1 on two drum brakes 4 of the rear axle can be reliably determined and the manufacturing costs of the force measuring device 9 and its production can be described as advantageous.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

L'invention concerne un frein de stationnement à actionnement électromécanique pour des véhicules automobiles. Le frein de stationnement selon l'invention comprend pratiquement au moins un dispositif (1) servant à générer une force d'application de freinage, une unité de commande électronique (6) et des dispositifs de freinage mécaniquement verrouillables (4) sur au moins un essieu, les dispositifs de freinage (4) pouvant être appliqués par le dispositif (1) au moyen d'au moins un câble de frein (11) et la force d'application de freinage étant déterminée au moyen d'un dynamomètre (9). L'invention vise à déterminer la force d'application de freinage de manière sûre par un dynamomètre de structure simple et de réalisation économique. A cet effet, on intègre dans le câble de frein (11) un encodeur (14) dont la position est déterminée par un élément capteur magnétorésistant (15) monté fixe.
PCT/EP2004/051060 2003-06-12 2004-06-08 Frein de stationnement a actionnement electromecanique pour des vehicules automobiles Ceased WO2004110835A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10326371 2003-06-12
DE10326371.3 2003-06-12
DE102004025361.7 2004-05-19
DE102004025361A DE102004025361A1 (de) 2003-06-12 2004-05-19 Elektromechanisch betätigbare Feststellbremse für Kraftfahrzeuge

Publications (1)

Publication Number Publication Date
WO2004110835A1 true WO2004110835A1 (fr) 2004-12-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/051060 Ceased WO2004110835A1 (fr) 2003-06-12 2004-06-08 Frein de stationnement a actionnement electromecanique pour des vehicules automobiles

Country Status (1)

Country Link
WO (1) WO2004110835A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593569A1 (fr) * 2004-05-06 2005-11-09 Sila Holding Industriale Spa dispositif de contrôle pour servofrein de véhicule
EP1655190A1 (fr) * 2004-11-08 2006-05-10 Peugeot Citroën Automobiles S.A. Commande à retour d'effort de frein secondaire électrique de véhicule automobile
WO2007088105A1 (fr) * 2006-02-01 2007-08-09 Siemens Aktiengesellschaft Dispositif pour faire fonctionner un frein
DE102006013216A1 (de) * 2006-03-22 2007-09-27 Siemens Ag Kraftmessvorrichtung für eine Feststellbremse eines Fahrzeugs, insbesondere eines Personenkraftwagens
WO2012068014A3 (fr) * 2010-11-19 2012-06-21 Thomas Patrick Fitzsimons Traitement d'une pathologie unguéale

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5195377A (en) * 1990-04-17 1993-03-23 Garshelis Ivan J Magnetoelastic force transducer for sensing force applied to a ferromagnetic member using leakage flux measurement
US6249737B1 (en) * 1997-03-12 2001-06-19 Kuster & Co. Gmbh Vehicle parking brake system
DE10043739A1 (de) * 2000-09-05 2002-03-21 Fico Cables Sa Handbremse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5195377A (en) * 1990-04-17 1993-03-23 Garshelis Ivan J Magnetoelastic force transducer for sensing force applied to a ferromagnetic member using leakage flux measurement
US6249737B1 (en) * 1997-03-12 2001-06-19 Kuster & Co. Gmbh Vehicle parking brake system
DE10043739A1 (de) * 2000-09-05 2002-03-21 Fico Cables Sa Handbremse

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593569A1 (fr) * 2004-05-06 2005-11-09 Sila Holding Industriale Spa dispositif de contrôle pour servofrein de véhicule
US7448475B2 (en) 2004-05-06 2008-11-11 Sila Holding Industriale S.P.A. Device for controlling a motor-vehicle servo-assisted brake
EP1655190A1 (fr) * 2004-11-08 2006-05-10 Peugeot Citroën Automobiles S.A. Commande à retour d'effort de frein secondaire électrique de véhicule automobile
FR2877628A1 (fr) * 2004-11-08 2006-05-12 Peugeot Citroen Automobiles Sa Commande a retour d'effort de frein secondaire electrique de vehicule automobile.
WO2007088105A1 (fr) * 2006-02-01 2007-08-09 Siemens Aktiengesellschaft Dispositif pour faire fonctionner un frein
DE102006013216A1 (de) * 2006-03-22 2007-09-27 Siemens Ag Kraftmessvorrichtung für eine Feststellbremse eines Fahrzeugs, insbesondere eines Personenkraftwagens
US7971488B2 (en) 2006-03-22 2011-07-05 Continental Automotive Gmbh Force measuring device for a parking brake of a vehicle, in particular of a passenger vehicle
WO2012068014A3 (fr) * 2010-11-19 2012-06-21 Thomas Patrick Fitzsimons Traitement d'une pathologie unguéale

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