EP1445494B1 - Stellelement mit Lageerkennung - Google Patents

Stellelement mit Lageerkennung Download PDF

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Publication number
EP1445494B1
EP1445494B1 EP20040100364 EP04100364A EP1445494B1 EP 1445494 B1 EP1445494 B1 EP 1445494B1 EP 20040100364 EP20040100364 EP 20040100364 EP 04100364 A EP04100364 A EP 04100364A EP 1445494 B1 EP1445494 B1 EP 1445494B1
Authority
EP
European Patent Office
Prior art keywords
hall sensor
actuating element
piston rod
magnet
housing
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.)
Expired - Lifetime
Application number
EP20040100364
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1445494A3 (de
EP1445494A2 (de
Inventor
Thomas Haubold
Dirk Traichel
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.)
Mann and Hummel GmbH
Original Assignee
Mann and Hummel GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mann and Hummel GmbH filed Critical Mann and Hummel GmbH
Publication of EP1445494A2 publication Critical patent/EP1445494A2/de
Publication of EP1445494A3 publication Critical patent/EP1445494A3/de
Application granted granted Critical
Publication of EP1445494B1 publication Critical patent/EP1445494B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/10—Characterised by the construction of the motor unit the motor being of diaphragm type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8158—With indicator, register, recorder, alarm or inspection means
    • Y10T137/8225—Position or extent of motion indicator
    • Y10T137/8242—Electrical

Definitions

  • the invention relates to an actuating element according to the preamble of patent claim 1.
  • Control elements for actuating actuators such as valves, rotary valves or valves are widely known in the art. For many applications, it is necessary to detect and monitor at least the end positions of a piston rod corresponding to the drive of the actuating element. It is known from EP 0 345 459 B1 to arrange an electrical switch within a pressure chamber of a pneumatic control element which can be actuated relative to the housing depending on the position of the piston rod. When the ore reaches a predetermined position through the piston rod, the switch is triggered and thus outputs an electrical signal. The switch is deliberately placed in the pressure chamber of the pneumatic actuator so as to be protected against contamination and corrosion by aggressive media. Likewise, those skilled in adjusting elements are known in which the position detection takes place on the decrease of a signal of a grinding potentiometer.
  • the object of the invention is to provide an actuator with an integrated position detection, which is simple, works with a wear-free position detection and fewer parts within a simple exchange large application spectrum is applicable.
  • Another object of the invention is to provide not only an end position detection of the actuator, but also the ability to detect the path between the end positions. This object is solved by the features of claims 1 and 10.
  • the adjusting element has a housing with a drive arranged therein and at least one means for detecting the position, wherein a piston rod movably mounted in the housing is correspondingly connected to the drive in order to exert a force effect.
  • the means for detecting the position consists of at least one stationary Hall sensor and at least one corresponding to the Hall sensor, movably arranged magnet.
  • the magnetic field emanating from the magnet generates a magnetic flux through the Hall sensor as a function of the position of the magnet relative to the Hall sensor.
  • the drive is preferably via a vacuum housing with membrane, so pneumatically realized, but can also be performed electrically, mechanically or hydraulically.
  • the design of the control element completely made of plastic, consist of a material mix between plastic and metal or purely metal.
  • the piston rod movably mounted in the housing in this case preferably has a quadrangular cross-section, but may also have a circular (oval) or polygonal cross-section without restriction. Likewise, it can be made straight or curved. It is correspondingly connected to the drive, wherein the connection can be detachable or insoluble nature and it is also possible to carry out this connection via an intermediate gearbox or gearbox or a different kind of deflection.
  • the position detection is realized in the control element according to the invention without contact via a stationary in or on the housing arranged Hall sensor with at least one corresponding thereto movable magnet.
  • Hall sensors are used to measure magnetic fields.
  • the known in the prior art Hall sensors have either an analog or a digital signal output, some are fully programmable, whereby any temperature drifts or other disturbances can be eliminated programmatically, and they can be seen in their function as contactless potentiometers.
  • Hall sensors can record translational motion sequences including their endpoints as well as rotational motion sequences including end points and angle detection; This is done by changing the magnetic field and flux when approaching or removing a magnet.
  • the piston rod is connected via at least one turntable corresponding to a shaft and thus converts a translational movement of the piston rod in a rotational movement of the shaft.
  • This is comparable z. B. with the crank mechanism of a bicycle in which an approximately translational movement of the leg with respect to the pedals in a rotational movement is converted to the chain drive.
  • the piston rod is movably connected in the housing and corresponding to the drive of the actuating element, it is possible for them to allow a certain angular offset so as to follow an approximate circular path of the connection point between the piston rod and turntable in the outer region of the turntable.
  • this implementation takes place via a kind of conversion gear and is converted by this the translational movement in a rotational movement.
  • the thus driven shaft can, for.
  • a switching flap a switching flap association or a rotary valve within a certain angular range twist.
  • other possibilities are conceivable in which a power transmission by a rotational movement is necessary.
  • the turntable may be in the form of a substantially circular voluminous disc, but here too the design possibilities are virtually unlimited.
  • the turntable can also be square or oval shape and in extreme cases even consist of only one deflection bar. The For this necessary kinematic implementations should be well known to those skilled and require no further examples.
  • the Hall sensor of the position detection is detachably arranged in the housing of the actuating element.
  • a detachable connection such as.
  • a screw, a clip connection or a pure connector and other known in the art connection types is detachably connected to the housing.
  • the Hall sensor is permanently arranged in the housing of the actuating element.
  • the Hall sensor is connected to the receiving point provided in the housing via an adhesive method or a welding method or other means known in the art for the permanent connection of two elements with the housing. Due to the permanent connection possible errors due to a change in position of the Hall sensor, z. B. be minimized by vibration and the associated distorted signal output.
  • a particular embodiment of the invention provides that at least one flux guide plate is arranged on the Hall sensor for amplifying the magnetic flux of the movably arranged magnet and this flux guide plate substantially covers the poles of the magnet in predetermined positions.
  • This flux baffle is connected to a corresponding to the Hall sensor and covers at least in a partial region, the path of the magnet movably guided in the housing in the change in position by the piston rod.
  • the shape of the flux baffle preferably resembles a U-shape, with the two legs of the U respectively covering the north and the south pole of the magnet at least one point of the magnet on its path of movement.
  • At least one magnet is arranged on the piston rod and the Hall sensor detects the translational change in position of the piston rod.
  • the at least one magnet is integrated into the piston rod, so that there is a magnetic flux that is as unhindered as possible.
  • the magnet can be integrated into recesses in the piston rod and connected to it via detachable or non-detachable connection types.
  • the magnet preferably has a cylinder or pin shape, but other shapes are conceivable and technically feasible.
  • At least one magnet is arranged on the turntable and the Hall sensor thus detects the rotational position change of the shaft.
  • the Hall sensor is arranged stationary in the housing so that it can record a change in position of the turntable and the corresponding shaft associated therewith corresponding to a change in position of the magnet by rotating the hub by the magnetic flux thereby changed.
  • the angle of rotation can be detected starting from a zero position of the driven shaft.
  • the preferred application here are rotary valves, which are connected to the shaft, or switching flaps or switching flap walls, but there are also other applications conceivable and possible, in which the position of the shaft and the rotation angle of the shaft for an evaluation of relevance.
  • the at least one magnet arranged on the turntable can be detachably or non-detachably connected to the turntable and changed by the rotary movement of the turntable Magnetic flux relative to the stationary Hall sensor.
  • the shape of the magnet has no influence on the function of the position detection.
  • the Hall sensor for detecting predetermined positions on an output for a digital signal. This makes it possible to simply z. B. to detect the end positions of the movement and spend.
  • the Hall sensor acts as a simple end position detection and replaces the known from the prior art closing contact. Depending on the signal strength and a possible programming of the Hall sensor, it is possible to realize an almost arbitrary exact end position and position detection.
  • the Hall sensor has an output for an analog signal for detecting a course of the position.
  • the output signal changes depending on the change in the magnetic flux. This change takes place as soon as the movable at least one magnet performs a relative movement to the stationary Hall sensor.
  • an evaluation logic implemented either in the Hall sensor or externally, each movement point of the piston rod or the rotary valve can be detected and output.
  • FIG. 1 shows a schematic view of an actuating element 10, designed here as a vacuum actuating element, with a vacuum port 11, which is connected to a vacuum chamber 12 with a spring 13 embedded therein.
  • the vacuum chamber is formed from a housing upper part 14, which is sealingly connected to a housing lower part 15.
  • the spring 13 is supported on the one hand in the upper housing part 14 and on the other hand on a spring support 16, which is connected to a piston rod 17 from.
  • the piston rod 17 is movably led out of this in the lower region of the housing lower part 15, and by a membrane 18, the vacuum chamber 12 is sealingly separated from the environment.
  • the diaphragm 18 and the spring support 16 are connected to each other, whereby the piston rod 17 is attracted against the spring force of the spring 13 in the direction of the upper housing part 14 upon application of a negative pressure.
  • the piston rod 17 has a through hole 19 through which a pin 20, which is rotatably mounted eccentrically in a hub 22, passes through.
  • a locking ring 21 is embedded at the end of the pin 20.
  • the hub 22 is concentrically fixedly connected to a shaft 23, wherein the shaft is mounted via a ball bearing 24. Due to the fixed connection between the hub 22 and shaft 23, a rotational force can be transmitted from the hub to the shaft, wherein in the further course of the shaft 23 z.
  • a Hall sensor 26 is fixedly arranged in the housing. This is connected via a closed cable guide 27 with a connector output 28.
  • the system of Hall sensor 26, closed cable guide 27 and plug outlet 28 is clipped in the upper region of the housing lower part 15 in a there arranged Einclipsö réelle 29 in the X direction.
  • the lower end position of the piston rod 17 is characterized in that here the magnet 25a is at the level of the stationary Hall sensor 26.
  • the upper end position of the piston rod 17 is then reached as soon as the magnet 25 b is at the level of the Hall sensor 26. Since the Hall sensor 26 reacts to a change in the magnetic field strength or the magnetic flux, it outputs a Endlagensignal when reaching the highest magnetic field strength. The highest magnetic field strength is then reached as soon as the magnet is exactly at the height of the Hall sensor.
  • the arrangement of the Hall sensor 26 and the magnets 25 a and 25 b outside the pressure chamber 12 can be a very low height of the pneumatic drive achieve, here the contactless sensing proves to be very beneficial, since this area is not necessarily completely free of contamination and is aggressive media. Should a Hall sensor with an analogue output be used in this constellation, the exact course of travel of the piston rod 17 could be output by removing the magnetic field strength between the two magnets 25a and 25b. These values can then z. B. are evaluated by an engine control unit and then in the calculation z. B. include a map with.
  • FIG. 2 shows the section A - A as a lateral plan view of the turntable 22. Components corresponding to FIG. 1 are provided with the same reference numerals.
  • the hub 22 is concentric with the shaft 23 and is rotatably connected thereto.
  • the connecting pin 20 between piston rod 17 and hub 22 is arranged eccentrically and thus causes in translational movement of the piston rod 17, a rotation of the hub 22 and thus also the associated shaft 23rd
  • FIG. 3 shows a schematic view of a variant of the adjusting element 10 according to the invention. Components corresponding to FIG. 1 are provided with the same reference numerals.
  • This pneumatic actuator 10 differs from the actuator 10 of Figure 1 in that here no conversion of the translational movement of the piston rod 17 in a rotational movement of a shaft 23 is completed. Another important difference is that here only one magnet 25 is arranged on the piston rod 17. In the case of a digital design of the Hall sensor, only the end position of the piston rod 17 can be detected by means of the Hall sensor when the actuating element 10 is subjected to negative pressure.
  • the adjusting element 10 shown in Figure 3 is located in the second end position of the piston rod 17, which is mechanically bounded by the walls of the housing lower part 15.
  • a Hall sensor 26 which has an analog output, the entire change in position of the piston rod 17 can also be detected in this arrangement. In this case, the strength of the magnetic field continuously increases until the end stop in the vacuum applied form.
  • a suitable programming and calibration of the Hall sensor 26 it is also possible to achieve a controlled travel recording in this simple form. If, due to the space available, a closed cable guide 27 attached to the housing is not possible, it is also possible in all variants to work with an open cable guide and to arrange the plug outlet 28 on another component in the vicinity of the actuating element.
  • FIG. 4 shows the schematic view of an enlargement of the Hall sensor with flux guide plates attached thereto.
  • the Figure 1 corresponding components are provided with the same reference numerals.
  • the piston rod 17 goes into the leaf level
  • the system for detecting the position is shown in section at the level of the Hall sensor 26.
  • a sensor housing 31 with plug outlet 28 is clipped into a corresponding receptacle of the housing lower part 15.
  • the Hall sensor 26 and two flux guide plates 30 are embedded. It can be seen that the flux guide plates 30 completely cover the magnets 25 embedded in the piston rod 17 in this position.
  • the magnetic flux emanating from the magnet 25 is amplified by the flux guide plates 30 up to a three-digit factor and thus increases to the same extent the sensitivity of the Hall sensor 26 to a change in the magnetic flux.
  • the resulting change in the magnetic field strength results in a different magnetic induction in the Hall sensor 26 and thus a changed output signal at the connector output 28.
  • the equipment with the Flussleitblechen 30 is optional and not mandatory for detection a changed magnetic field strength by a movement of the piston rod 17.
  • the flux guide plates 30 serve to amplify the magnetic field and thus include the possibility of using a less sensitive Hall sensor 26 with the associated cost advantages.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Actuator (AREA)
  • Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
  • Details Of Television Scanning (AREA)
  • Air Bags (AREA)
EP20040100364 2003-02-04 2004-02-02 Stellelement mit Lageerkennung Expired - Lifetime EP1445494B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10304551 2003-02-04
DE2003104551 DE10304551A1 (de) 2003-02-04 2003-02-04 Stellelement mit Lageerkennung

Publications (3)

Publication Number Publication Date
EP1445494A2 EP1445494A2 (de) 2004-08-11
EP1445494A3 EP1445494A3 (de) 2004-09-29
EP1445494B1 true EP1445494B1 (de) 2006-06-21

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Country Status (5)

Country Link
US (1) US7044444B2 (es)
EP (1) EP1445494B1 (es)
AT (1) ATE331144T1 (es)
DE (2) DE10304551A1 (es)
ES (1) ES2266985T3 (es)

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DE102020105488B4 (de) 2020-03-02 2022-11-03 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verstellvorrichtung für ein Kraftfahrzeug
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US12029177B2 (en) 2021-07-01 2024-07-09 Haier Us Appliance Solutions, Inc. System and method for detecting a tower positioning fault using a drive assembly in an indoor garden center

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US20040189284A1 (en) 2004-09-30
EP1445494A3 (de) 2004-09-29
ES2266985T3 (es) 2007-03-01
US7044444B2 (en) 2006-05-16
DE10304551A1 (de) 2004-08-12
DE502004000784D1 (de) 2006-08-03
EP1445494A2 (de) 2004-08-11

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