Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
  • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
  • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
  • H01F7/122—Guiding or setting position of armatures, e.g. retaining armatures in their end position by permanent magnets
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/16—Rectilinearly-movable armatures
  • H01F7/1638—Armatures not entering the winding
  • H01F7/1646—Armatures or stationary parts of magnetic circuit having permanent magnet
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
  • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
  • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
  • F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
  • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
  • H01F7/1844—Monitoring or fail-safe circuits
  • H01F2007/185—Monitoring or fail-safe circuits with armature position measurement

Definitions

• the present invention relates to an electromagnetic camshaft adjusting device according to the preamble of the main claim.
• Such a device is well-known from the prior art and serves the so-called return actuator, wherein, for example, a detected in the de-energized state of the coil unit and evaluated induction signal is evaluated according to the camshaft position moving armature unit at the terminals of the coil unit.
• a device is shown for example in DE 10 2006 035 225 A1 of the Applicant.
• camshaft adjustment monitoring is combined with an already existing knock sensor electronics, combined with a lambda probe electronics, or a Crankshaft acceleration is detected and evaluated.
• the induction voltage measured in the generic manner depends on factors such as the speed of movement (this in turn depends on the engine speed), the current ambient temperature, soiling, etc., so that a desired reliable detection of faulty circuits is not possible guaranteed in every operating condition.
• Object of the present invention is therefore to provide a simple, reliable and with low manufacturing technology see and evaluation effort to realize camshaft adjusting device, in which a current camshaft adjustment state or a current position of the camshaft adjustment causing armature, including driven actuator reliably can be determined.
• the housing or carrier unit accommodating the camshaft adjustment device is associated with stationary magnetic field detection means which cooperate with permanent magnet means movable in accordance with the armature and / or actuator unit so that in all operating states, namely the energization state of the Coil unit and the non-Bestromungsschreib the coil unit, through this magnetic Field detection an axial position determination is possible.
• the magnetic field detection means are advantageously realized as separate sensor means separate from the coil unit, which sensor means are constructed in an otherwise known manner and advantageously in the context of preferred developments as sensor sensors realized as Hall sensors, GMR or AMR sensors.
• the armature unit itself has a permanent magnet unit in the context of the electromagnetic adjustment, which advantageously performs an advancing movement of the armature unit (and actuating unit) by energizing the coil unit.
• This movement of the permanent magnet unit in the armature unit can then be determined in a very simple manner by the magnetic field sensor, in particular if it is provided adjacent to the permanent magnet unit and a change of the permanent magnetic field can be detected thereby (variable in movement).
• the ram unit is wholly or partially permanent magnetically, wherein it is in this context, but also in the design of a permanent magnet on the armature unit, further advantageous, a connection between actuator ( designed as a ram unit) and anchor unit Permanent magnetic adhesion between these units releasably designed.
• the at least one magnetic field sensor for realizing the magnetic field detection means is provided at a stationary position in the housing or carrier unit, where - meaningful for manufacturing and trouble-free operation - it makes sense to this sensor (possibly together with other stationary aggregates of the device) in a otherwise known manner by means of a polymeric potting material or the like to shed moisture and dirt protected.
• a (relative) position of the magnetic field sensor unit in the housing can also be fixed in this way, for example by virtue of the fact that the potting compound completely or partially encloses the sensor.
• Figure 1 is a schematic view of the structure of the electromagnetic camshaft adjusting device according to a first embodiment with an anchor unit and a ram unit associated therewith;
• FIG. 2 shows a device analogous to FIG. 1 with a pair of armature units, which are provided side by side and can be moved separately from each other, each having a seated tappet unit and in each case one associated sensor unit;
• FIG. 3 shows a further embodiment analogous to FIG. 2, but with a sensor unit jointly provided for both armature units or tappet units;
• Figure 4 is a sectional view perpendicular to the longitudinal axis of movement of the arrangement of Figure 3 with the shown, with respect to both Ankerg. Plunger units symmetrically arranged sensor unit;
• FIG. 5 shows a variant of the representation according to FIG. 4 with asymmetrically arranged sensor unit, ie different radial distance of the sensor unit to an armature or ram unit relative to the other armature or ram unit;
• FIG. 6 shows a longitudinal section through a concrete realization form of the electromagnetic camshaft adjusting device for realizing the scheme of FIG. 1;
• Figure 7 shows a longitudinal section through the upper housing portion of the embodiment of Figure 6 and
• FIG. 8 shows a perspective view of a detail from FIG. 7 for clarifying the three-dimensionality.
• FIG. 1 illustrates the structure and operation principle of the electromagnetic camshaft adjusting device according to a first embodiment of the invention:
• a stationary coil unit 10 is provided, which is formed around a stationary core 12 around.
• an anchor unit 14 In this stationary units in the axial direction (ie longitudinal direction in Figure 1) movably mounted is an anchor unit 14 with anssitzender ram unit 16, which with its engagement-side end 18 in an otherwise known manner for cooperation with a groove or the like. a camshaft adjustment is formed.
• the armature unit 14 has a permanent magnet unit 20 which axially magnetises in the manner shown and faces the core unit such that in response to energizing the coil unit 10, the armature unit together anssitzender ram unit 16 (this is either fixed or by adhesive force of the permanent magnet unit 20 solvable the permanent magnet unit held) in the axial direction
• the permanent magnet unit 20 is associated with a stationary sensor unit 22 (suitable in the housing not shown in the figures), which detects the permanent magnetic field and, suitably realized as a Hall element, detect this magnetic field and its change by movement of the armature unit 14 and a subsequent electronic evaluation can perform.
• a stationary sensor unit 22 suitable in the housing not shown in the figures
• this basic realization form makes it possible to generate a correspondingly positionally variable signal along a suitable movement stroke of the armature unit 14, which is advantageous at approximately the known principle of detecting an induction voltage at the coil ends of the unit 10 in the de-energized state
• Coil unit 10 can perform a position detection and can detect the position, even if the anchor unit does not move, so stands still at a corresponding position.
• Figure 1 (as well as in Figures 2 to 5) show only the schematic interaction for realizing the basic principle of the invention; the concrete realization of an embodiment is related explained with reference to Figures 6 to 8, further with reference to a favorable realization of the actuator shown in Figures 1 to 5 reference is made to the disclosed patent application DE 20 2008 010 301 of the applicant, which in terms of the design of a surrounding housing, the core -, yoke and anchor unit and the coil unit as part of the invention should be included in the present application.
• FIG. 2 A particularly advantageous development shows the embodiment of Figure 2, in which (here in a common housing, not shown), a pair of actuators, each consisting of coil unit 10, core unit 12 and anchor units 14a and 14b is provided side by side; especially in the context of a camshaft adjustment devices are often used with two plungers, wherein a first plunger 16a is used to move the camshaft adjustment mechanism in a first position and an axially parallel driven second plunger 16b is used to return to the starting position to effect. Due to the often restrictive space requirements, the arrangement shown by way of example and schematically in FIG. 2 is accommodated in a common housing.
• FIG. 2 also shows two sensors 22a and 22b, which, analogous to the representation of Figure 1 (to that extent also corresponding reference numerals are used), a respective anchor unit or ram unit are assigned.
• FIG. 3 shows a variant of the realization form of FIG. 2 (and in turn, in the case of comparable assemblies, FIG. pen corresponding reference numerals used).
• the device of Figure 3 shows a common sensor unit 22c, which, compare the cut at the height of the sensor radial section of Figure 4, approximately symmetrical between two anchor units (respectively Permanent magnets 20) is arranged, such that a radial distance influencing the measured field strength is equal to both permanent magnet arrangements 20 in the sectional plane and at the same axial position of the armature units 14a, 14b a magnetic field which is the same in absolute value but divergent in the respective direction Magnetic field generated.
• FIG. 1 Surrounded by a cylindrical housing shell 30 and encapsulated by a plastic potting material 32 is a coil unit together with core unit (recognizable is only a planar end portion 34, which protrudes from the encapsulation) provided; in a manner not shown in more detail, the coil unit is electrically contacted and the connecting cable for external contacting to an integrally ansitzenden Steckerab ⁇ section 36 out.
• core unit recognizable is only a planar end portion 34, which protrudes from the encapsulation
• a cylindrical sensor unit 38 is mounted in the housing so that it is enclosed in about half of the potting material 32 and protrudes with its (in the figure 6 lower) half in a cavity 40 in the housing 30.
• axially relatively movable to the core 34 protrudes from the opposite side of an armature unit 42 which centrally carries a disc-shaped permanent magnets 44, which in the manner described above without contact with the sensor unit 38 cooperates so that in axial (ie Figure 6 vertical) movement of the armature unit, the stationary sensor unit 38 detects a changing permanent magnetic field and this (not shown in detail) feeds a subsequent electronic processing.
• the housing 30 is closed on the bottom side with an end piece 46, in which a ram unit 48 is guided; this contacts at one end (in the upper end) the armature unit 42 or is part of this, in the opposite end region of the camshaft adjusting engagement portion 18 is formed.
• Channels 50 in the bottom piece 46 serve for venting and a circumferential radial seal 52 of the seal against a receiving housing of the control partner, eg the camshaft housing.
• FIG. 8 once again illustrates in a favorable manner how the potting compound 32 is provided in the housing shell 30 and the sensor unit 38 holds reliably, dirt-protected and easily mountable at its relative position to the permanent magnet 44 or to the anchor unit 42.
• the present invention is not limited to the described embodiments. Although it is favorable to use a conventional permanent magnet detector principle (Hall, GMR or AMR) for the sensor unit, other magnetic detection options are also conceivable.
• a conventional permanent magnet detector principle Hall, GMR or AMR
• the present invention is also favorable as a camshaft adjustment device, but the principle of electromagnetic actuators, in particular in conjunction with a permanent magnet at the armature and a stationary magnetic field detection of this armature, is suitable for basically any control tasks which are advantageous in the manner described and need reliable detection of the armature or plunger position for any operating situations.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Valve Device For Special Equipments (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=42270276

Family Applications (1)

Country Status (6)

Families Citing this family (20)

Family Cites Families (8)

• 2009
  • 2009-04-16 DE DE202009006940U patent/DE202009006940U1/de not_active Expired - Lifetime
• 2010
  • 2010-03-31 US US13/264,359 patent/US8448615B2/en active Active
  • 2010-03-31 AT AT10719727T patent/ATE545771T1/de active
  • 2010-03-31 EP EP10719727A patent/EP2352910B1/fr active Active
  • 2010-03-31 CN CN201080016983.8A patent/CN102395762B/zh active Active
  • 2010-03-31 WO PCT/EP2010/002041 patent/WO2010118826A1/fr active Application Filing

Non-Patent Citations (1)

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