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WO2004005857A1 - Dispositif de mesure de la course de la tige de direction d'une direction de vehicule - Google Patents

Dispositif de mesure de la course de la tige de direction d'une direction de vehicule Download PDF

Info

Publication number
WO2004005857A1
WO2004005857A1 PCT/EP2003/007172 EP0307172W WO2004005857A1 WO 2004005857 A1 WO2004005857 A1 WO 2004005857A1 EP 0307172 W EP0307172 W EP 0307172W WO 2004005857 A1 WO2004005857 A1 WO 2004005857A1
Authority
WO
WIPO (PCT)
Prior art keywords
handlebar
magnetic field
steering
sensor
generating means
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/EP2003/007172
Other languages
German (de)
English (en)
Inventor
Andreas Schirling
Achim Netz
Sighard SCHRÄBLER
Norman Muth
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 DE10328753A external-priority patent/DE10328753A1/de
Application filed by Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Priority to EP03762620A priority Critical patent/EP1521945A1/fr
Publication of WO2004005857A1 publication Critical patent/WO2004005857A1/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
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D15/00—Steering not otherwise provided for
    • B62D15/02—Steering position indicators ; Steering position determination; Steering aids
    • B62D15/021—Determination of steering angle
    • B62D15/0225—Determination of steering angle by measuring on a steering gear element, e.g. on a rack bar
    • 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
    • G01D5/244—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 characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—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 characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • G01D5/2451—Incremental encoders
    • G01D5/2452—Incremental encoders incorporating two or more tracks having an (n, n+1, ...) relationship
    • 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
    • G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
    • G01D2205/80—Manufacturing details of magnetic targets for magnetic encoders

Definitions

  • the invention relates to a device for measuring the handlebar travel of a motor vehicle steering system, which has a steering actuation device and a handlebar operatively connected to it, which is essentially linearly movable and pivots the wheels into a desired position via further elements, such as tie rod and tie rod lever.
  • the handlebar is usually designed as a rack (rack and pinion power steering).
  • vehicle steering systems are known in which the steering actuation device and the steered vehicle wheels are only coupled via a controlled system and wherein there is no longer a mechanical connection between the steering handwheel and the vehicle wheels.
  • the steerable vehicle wheels are then adjusted by an electromechanical actuator that moves the handlebar linearly and swivels the wheels into the desired position via additional elements such as tie rod and tie rod lever (electro-mechanical steering).
  • the object of the invention is to provide a device for measuring the handlebar travel of a motor vehicle steering system that works safely and reliably.
  • handlebar is to be interpreted very broadly and includes, for example, one-piece handlebars and the parts of multi-part, in particular two-part, handlebars.
  • one or more field generating means are provided in the area of the handlebar, which have a plastic-bound permanent magnetic material as material and a magnetic field line course and / or magnetic field strength course according to the vernier principle.
  • At least one sensor module which has at least one magnetic field sensor and at least one sensor circuit, and which converts the magnetic field line course or magnetic field strength course into further processable output signals, which indicate a linear path change or the position of the handlebar in the direction of its longitudinal axis, is arranged in a stationary manner adjacent to the handlebar.
  • the sensor module is preferably arranged in a stationary manner at a distance of 0 to approximately 2 mm. This ensures a safe but non-contact sensing.
  • the term "stationary" here means that the sensor module always remains in the same place - even during a steering movement - while the handlebar performs a linear movement when the steering is operated.
  • the vernier is applied to the absolute measurement of the path on the plastic-bonded permanent magnetic material, i.e. magnetized.
  • the field generation means extend along the longitudinal axis of the handlebar and are positively connected to the handlebar.
  • the positive connection is established by adapting an elongated field generating means to an at least approximately circular cross section of the handlebar.
  • the field generating means preferably with an at least approximately hollow cylindrical cross section, is fitted into an axial recess in the handlebar.
  • the handlebar is a substantially cylindrical rod and the field generating means is a substantially hollow cylindrical tube, which is arranged outside the handlebar and which preferably overlaps at least the length that the handlebar is moved in both directions at full deflection.
  • the positive connection with the field generating means is then preferably produced by surrounding, in particular overmolding or spraying on a layer or wrapping, the handlebar with the field generating means in the form of a powdery, plastic-bonded permanent magnetic material.
  • the “overmolding” or “spraying” here means a process in which the powdery, plastic-bonded permanent magnetic material is applied to the surface of the handlebar by means of an anisotropic spraying process and either simultaneous or subsequent magnetization. This measure allows the permanent magnetic material to be applied and magnetized onto the handlebar in a relatively simple technical manner, a secure connection between the material and handlebar being possible.
  • At least one magnetoresistive magnetic field sensor is used. Accordingly, sensors are used that work according to the AMR principle and use the anisotropic magnetoresistive effect.
  • the sensor module is arranged in a stationary manner on an axle steering module or on a carrier arranged on an axle steering module, the sensor module preferably being mechanically detachably connected to the axle steering module or the carrier.
  • At least two magnetic field sensors are provided, whereby a redundant function is ensured and the at least two Magnetic field sensors either tap the magnetic field of a common field generating means or some or all sensors tap the magnetic field of a field generating means specifically assigned to a magnetic field sensor.
  • the redundant function can either be fully redundant, partially redundant or also two or more redundant, so that in the event of a failure or a malfunction of a sensor or a sensor circuit, a duplicate element takes over the function of the failed or faulty element or detects its malfunction and possibly detects it. reports to a monitoring device.
  • the sensor module is arranged in a ring around the handlebar.
  • an independent device according to the invention is provided for each steerable wheel, which is preferably itself redundant.
  • the invention is preferably used for electromechanical steering.
  • the device according to the invention for measuring the handlebar travel is shown in more detail by way of example with reference to FIGS. 1 to 4.
  • Show it: 1 shows the device according to the invention for measuring the handlebar travel of an electromechanical vehicle steering in a schematic illustration
  • FIG. 2 shows a schematic, perspective illustration of a longitudinal section through the handlebar in the region of the sensor module
  • FIG. 3 shows the sensor module shown in FIG. 2 in an enlarged view
  • FIG. 4 shows a schematic representation of a longitudinal section through the handlebar in the area of the sensor module in an enlarged view.
  • Fig. 1 shows an electromechanical vehicle steering with the inventive device for measuring the handlebar travel in a schematic representation.
  • the driver operates the steering handwheel 23 or a similar control, e.g. a sidestick with which he can specify his direction of travel.
  • the steering handwheel 23 or a similar control, e.g. a sidestick with which he can specify his direction of travel.
  • Desired direction of travel is recorded redundantly by sensors and communicated to a central control unit 14.
  • actuation force simulator 18 the driver receives haptic feedback when the steering is actuated.
  • This preferably electromechanical actuation force simulator 18 is controlled by the central control unit 14.
  • the driver's request is evaluated in the central control unit 14, converted into a steering angle (setpoint) for an actuating unit 13 and supplied to the actuating unit via data transmission lines 16, 17.
  • the actuator 13 then pivots by moving the Handlebar 15, the wheels 19a, 19b in accordance with the driver's request.
  • the current actual value of the wheel position of the steerable wheels is determined by a device according to the invention for measuring the handlebar travel with a sensor module 22, which scans magnetically active areas in a plastic-bonded magnetic powder assigned to the device according to the invention, arranged on or in the handlebar 15, and converted into further processable output signals ,
  • the output signals which indicate a linear path change dx 20 or the position of the steering rod 15 within the electromechanical axle steering module 13 in the direction of its longitudinal axis, are via the
  • axle steering module 13 also has two independent motor modules for longitudinal adjustment of the handlebar 15.
  • the electronic units of the motor modules are also redundant. If an actuator and / or electronics unit fails, the motor module / electronics unit, which is still intact, takes over the steering function.
  • the handlebar travel is recorded redundantly by the sensor module • 22.
  • FIGS. 2 shows the handlebar in the area of the sensor module in a perspective view
  • FIG. 3 shows the sensor module
  • FIG. 4 shows the handlebar in the area of the sensor module in a longitudinal section.
  • the device for measuring the handlebar travel has a sensor module 2, an electronics unit 6, and a plastic-bonded magnetic powder 4 surrounding the handlebar 3, which is arranged within a protective tube 5.
  • the electronics unit 6 is directly integrated in the sensor module 2.
  • the plastic-bonded magnetic powder 4 is advantageously incorporated into the handlebar 3.
  • the path measurement takes place via a relative movement between sensors, preferably MR sensors 7, and magnetic strips 8, which are applied to the plastic-bonded magnetic powder 4.
  • the handlebar 3 is designed so that the plastic-bonded magnetic powder 4 can be integrated into it.
  • the plastic-bonded magnetic powder 4 is preferably placed in the form of a mat around the handlebar 3 and glued to it.
  • the handlebar is surrounded by a cage, which is sprayed with the plastic-bonded magnetic powder 4.
  • the cross section of the handlebar 3 is changed only slightly. As a result, the handlebar 3 can be made smaller or it offers more security.
  • the sensor module 2 consists of an annular plate 9, which is positioned radially to the handlebar 3.
  • the MR sensors 7 are preferably applied directly (vertically) to the circuit board 9. To clearly identify an error that occurs detect and keep the measuring system functional, two MR sensors are required for each magnetic strip vernier 10. The two sensors are preferably combined into one. This results in advantages in terms of installation space.
  • the electronics 6 required for the MR sensors 7 are preferably applied to the same circuit board 9. This can be done between the sensors 7 and / or on the back of the board 9.
  • the circuit board 9 with the MR sensors 7 and the electronics 6 mounted thereon is preferably surrounded by a plastic housing 11.
  • Two interfaces are to be provided in the plastic housing 11 in order to enable redundant contacting of the MR sensors 7 or their electronics 6. This is preferably done via two connector strips 12, which are arranged radially offset by 180 °.
  • the sensor module is preferably provided with a clamping mechanism. This enables the sensor module 2 to be axially locked in the EML.
  • Magnetic strips 8 in the form of nonies with different magnetic polarization distances are applied to the plastic-bonded magnetic powder 4. This is preferably achieved with a magnetizing head that moves once over the complete handlebar 3.
  • 3 nonies are advantageously applied. This enables the position to be clearly determined at every point.
  • the measuring system is designed redundantly. That means that at in the event of a malfunction, the position measuring system remains operational.
  • the handlebar is preferably after the magnetization
  • the invention advantageously allows a higher level of safety to be achieved with a comparatively low weight of the device.
  • the system can also be manufactured with relatively large manufacturing tolerances and without setting options.
  • the electromechanical steering can be assembled and installed first. Because the zero position can be calibrated at any time without great effort.
  • Use steering actuation device in particular the steering wheel, input signal for a vehicle control system, in particular a vehicle dynamics control ESP.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un dispositif de mesure de la course de la tige de direction d'une direction de véhicule, comportant un élément d'actionnement de direction et une tige de direction reliée activement à ce dernier, ladite tige de direction pouvant être déplacée linéairement et faisant pivoter les roues dans une position souhaitée à l'aide d'autres éléments tels que barre d'accouplement et levier de barre d'accouplement. Le dispositif de mesure selon l'invention comporte un ou plusieurs éléments de production de champ au niveau de la tige de direction, présentant un matériau magnétique permanent à liaison plastique, et un profil de lignes de champ magnétique et/ou un profil d'intensité magnétique obéissant au principe de Nonius. Par ailleurs, au moins un module de capteurs est fixé à proximité de la tige de direction. Ledit module comporte au moins un capteur de champ magnétique et au moins un circuit de capteurs, et transforme le profil de lignes de champ magnétique ou le profil d'intensité magnétique en signaux de sortie pouvant être traités ultérieurement, indiquant une variation linéaire de la course ou la position de la tige de direction sur l'axe longitudinal.
PCT/EP2003/007172 2002-07-05 2003-07-04 Dispositif de mesure de la course de la tige de direction d'une direction de vehicule Ceased WO2004005857A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03762620A EP1521945A1 (fr) 2002-07-05 2003-07-04 Dispositif de mesure de la course de la tige de direction d'une direction de vehicule

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10230262.6 2002-07-05
DE10230262 2002-07-05
DE10328753A DE10328753A1 (de) 2002-07-05 2003-06-25 Vorrichtung zum Messen des Lenkstangenweges einer Kraftfahrzeuglenkung
DE10328753.1 2003-06-25

Publications (1)

Publication Number Publication Date
WO2004005857A1 true WO2004005857A1 (fr) 2004-01-15

Family

ID=30116607

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2003/007172 Ceased WO2004005857A1 (fr) 2002-07-05 2003-07-04 Dispositif de mesure de la course de la tige de direction d'une direction de vehicule

Country Status (2)

Country Link
EP (1) EP1521945A1 (fr)
WO (1) WO2004005857A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5314036A (en) * 1991-01-21 1994-05-24 Toyota Jidosha Kabushiki Kaisha Steering angle sensor
DE19915105A1 (de) * 1999-04-01 2000-10-12 Fraunhofer Ges Forschung Lenkvorrichtung für Fahrzeuge
DE10041089A1 (de) * 2000-08-22 2002-03-07 Bosch Gmbh Robert Verfahren zur Korrektur einer Winkelmessung
DE10150305A1 (de) * 2001-04-05 2002-10-31 Continental Teves Ag & Co Ohg Vorrichtung zum Messen des Lenkstangenweges einer Kraftfahrzeuglenkung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5314036A (en) * 1991-01-21 1994-05-24 Toyota Jidosha Kabushiki Kaisha Steering angle sensor
DE19915105A1 (de) * 1999-04-01 2000-10-12 Fraunhofer Ges Forschung Lenkvorrichtung für Fahrzeuge
DE10041089A1 (de) * 2000-08-22 2002-03-07 Bosch Gmbh Robert Verfahren zur Korrektur einer Winkelmessung
DE10150305A1 (de) * 2001-04-05 2002-10-31 Continental Teves Ag & Co Ohg Vorrichtung zum Messen des Lenkstangenweges einer Kraftfahrzeuglenkung

Also Published As

Publication number Publication date
EP1521945A1 (fr) 2005-04-13

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