EP3089177A1 - Systeme de couplage et procede de commande d'une electrovanne bistable pour un systeme fluidique - Google Patents

Systeme de couplage et procede de commande d'une electrovanne bistable pour un systeme fluidique Download PDF

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Publication number
EP3089177A1
EP3089177A1 EP16000656.5A EP16000656A EP3089177A1 EP 3089177 A1 EP3089177 A1 EP 3089177A1 EP 16000656 A EP16000656 A EP 16000656A EP 3089177 A1 EP3089177 A1 EP 3089177A1
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EP
European Patent Office
Prior art keywords
armature
switching
current
electromagnetic
compensating
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Granted
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EP16000656.5A
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German (de)
English (en)
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EP3089177B1 (fr
Inventor
Andreas Teichmann
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ZF CV Systems Hannover GmbH
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Wabco GmbH
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    • 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
    • H01F7/1607—Armatures entering the winding
    • H01F7/1615—Armatures or stationary parts of magnetic circuit having permanent magnet

Definitions

  • the invention relates to a circuit arrangement and a method for controlling a bistable solenoid valve for a fluid system, in particular a compressed air system in a vehicle. Furthermore, a solenoid valve device with the circuit arrangement and the bistable solenoid valve is provided.
  • a 3/2-way valve may be provided which applies a first pressure output in a first armature position to a second pressure output to vent a pressure outlet line or to connect with atmosphere; In this case, a pressure input is blocked. In a second armature position of the pressure input is connected to the first pressure output, z. B. for the pneumatic supply of a compressed air brake. The second pressure output is blocked here.
  • both positions can be formed by the solenoid valve.
  • a bistable solenoid valve both positions are kept safe in the de-energized state by a permanent magnet device, wherein a solenoid device is provided for the switching operations.
  • the DE 37 30 381 A1 shows such a bistable solenoid valve, which allows a permanent magnet holding force in both positions.
  • an armature with two axially towards its end formed sealing means axially displaceable and abuts in its two positions to a first end core or second end core, wherein it closes in each of the positions with its respective sealant at the respective end core a fluid passage.
  • a permanent magnet is provided to close a magnetic field via an outer magnetic yoke and the end cores toward the armature. ever after the formation of the air gap, a first permanent magnetic field is stronger or weaker than the respective other permanent magnetic field via the first core or a second permanent magnetic field via the second core.
  • either a first coil or a second coil is energized, which amplifies one of the two permanent magnetic fields to such an extent that, despite the formation of the air gap, it exceeds the magnetic holding force of the other permanent magnetic field and thus enables switching to the other stable end position.
  • the US Pat. No. 7,483,254 B1 shows a control circuit for a bistable permanent magnet device, in which a control via pulsed signals, in particular with RC elements takes place.
  • the EP 0 328 194 A1 describes a bistable valve mechanism with a spring preload, which can be overcome by energization.
  • the invention has for its object to provide a circuit arrangement and a method for switching or for driving a bistable solenoid valve, which allow safe and fast switching between the positions with little effort.
  • both electromagnetic devices are energized during the switching operations.
  • the electromagnetic device is thus energized on the switching side, at which the axial air gap between the core and the armature is provided, with a switching current in order to support the lower permanent magnetic field due to the air gap.
  • the other electromagnetic device is preferably used for at least partial compensation of the holding, stronger permanent magnetic field, which holds the armature without an air gap at the other core.
  • the currents are preferably reversed by the electromagnetic means in the switching operations;
  • Each solenoid device or coil can act in a switching operation switching and in the other switching operation compensating.
  • the compensating current through this coil is set opposite to the (in the other switching operation) switching current from the current direction.
  • the switching operation can be improved by the energization of both coils.
  • the second electromagnet device for amplifying the weaker second permanent magnetic field is energized for the second switching operation from the first position to the second position, but also the first electromagnet device for at least partial compensation of the first permanent magnetic field.
  • the magnetic holding force of the holding first permanent magnetic field is thus already reduced, and the switching second electromagnetic field can be made smaller in terms of its magnetic field strength or the formation of ampere-turns in order to enable the switching process by amplifying the second permanent magnetic field.
  • the supplementary energization of the compensating electromagnetic field basically does not require any additional expenditure on hardware, since a switching device, for example, is required anyway.
  • B. switching transistors, are provided for its wiring.
  • the first electromagnetic field and the first permanent magnetic field thus form a first overall magnetic field, correspondingly forming the second electromagnetic field and the second permanent magnetic field thus form a second total magnetic field.
  • the two electromagnetic devices i. in particular a first and second coil
  • the current directions for the respective switching operations are reversed accordingly, so that each one electromagnetic field as compensating, i. to compensate for the stronger permanent magnetic field and switching the other magnetic field, i. is used for the active circuit.
  • the complementary design of a compensating electromagnetic field can also be problematic, depending on the dynamics and position of the armature, since initially the switching total magnetic field due to the air gap is still small, whereas the "compensating" electromagnetic field used for compensation due to the missing air gap can grow up fast. So z. B. if too fast or too strong energizing the compensating first electromagnetic field may be so great that it not only compensates the first permanent magnetic field, but overcompensated so much that there is a first total magnetic field that is greater in magnitude than that provided for active switching second overall magnetic field, which is weakened by the air gap.
  • the currents are changed in magnitude: the compensating electromagnetic field is provided with a weaker compensating current and the switching electromagnetic field is formed with a larger switching current.
  • the different current intensities can be adjusted in particular by pulsed control, in particular by PWM.
  • the electromagnet devices can be connected via high-side driver circuits to an upper supply voltage and via a low-side driver circuit (Loside) to a lower supply voltage, e.g. B. mass, are switched. It can be created a circuit arrangement that requires little hardware, z. B. only with a few switches, z. B. six transistors, gets along, which serve to drive the solenoid devices or coils; a more complex timing is generally not required.
  • the Hiside driver can z. B. directly on and off, and the different currents for the switching and compensating magnetic field by PWM control done.
  • the electromagnetic devices can directly, z. B. parallel, between two serving as a driver driver transistors, in particular MOSFETs are connected, wherein at each terminal of each solenoid device (coil) then two transistors are connected as Loside driver, which are selectively controlled; It is thus possible in each case a "crosswise operation" via a Hiside driver for both coils and selective control of the "opposite" Loside driver.
  • the compensating electromagnetic field is weaker in that the compensating current is set to be weaker in magnitude than the sustaining current.
  • the compensating current is opposite in direction to the holding current and smaller in magnitude.
  • a temporally variable energization or control of the coils can take place, in which the current is not immediately moved to its maximum value, but is raised with a time delay, z. B. with a steady increase and / or with a sudden increase over at least one mean value. So z. B. a time switch-on ramp up and / or a discrete increase over one or more mean values carried out, which allow a mechanical adjustment of the anchor, d. H. z. B. in a period above 10 ms, z. In a period of 100 ms.
  • the complementary electromagnetic field in the turn-on ramp initially compensates for the air gap loose holding permanent magnetic field, while on the other hand, the switching electromagnetic field amplifies the permanent magnetic field, so that in the duty cycle an electromagnet training is achieved, the anchor in the desired manner in the other switching position pulls before the first permanent magnetic field is overcompensated.
  • both electromagnetic devices cooperates in particular synergistically with a radially arranged permanent magnet device, by which a radial permanent magnetic field is formed which extends between the electromagnet devices.
  • a radial first and radial second permanent magnetic field are formed, which can each have a holding effect and selectively amplified by the switching electromagnetic field or can be compensated in whole or in part by the holding electromagnetic field.
  • a permanent magnetic field extends in the radial direction from the inner armature via the permanent magnet and an outer magnetic yoke forming two permanent magnetic fields extending from the yoke either at one axial end over the first core to the armature or at the other end across the second core to the armature, in each of the two positions, respectively an axial air gap is provided from the armature to one of the two cores.
  • the permanent magnet device may be designed to be annular, d. H. as a ring or disc, which - unlike conventional magnets - is magnetized in the radial direction. Alternatively to a disc can also be several z.
  • rod-shaped permanent magnets are used, which are each magnetized radially outwardly and preferably avoid tilting moments of the armature perpendicular to the axial direction by their symmetrical design.
  • the permanent magnet means is located radially outside the armature, in particular in the axial direction between the two coils of the two solenoid devices, a larger space is available, so that here also materials can be used, which allow a greater axial extent and thus more cost-effective are as z.
  • the solenoid valve device has the circuit arrangement and further the bistable solenoid valve.
  • a bistable solenoid valve 1 is in particular for use in a compressed air system, in particular as a 3/2-way solenoid valve with three terminals, preferably a pressure input 2a, a first pressure outlet 2b and a second pressure outlet 2c, the z. B. can serve as a vent formed.
  • the bistable solenoid valve 1 in a pneumatic system or compressed air system, z. B. the compressed air system of a commercial vehicle serve, optionally according to the first anchor position I the Fig. 1 to connect to the first pressure outlet 2b the second pressure outlet 2c and thus the vent to vent the compressed air supply line, or to connect the connected to the pressure inlet 2a compressed air supply line, as further below with reference to FIGS. 9 and 10 is explained.
  • a first valve seal 8 is formed, which at a first valve seat 9, z. B. to the closure of the pressure input 2a, comes to rest, as well as continue a second valve seal 10, which abutment against a second valve seat 11, z. B. for closing the second pressure output 2c comes.
  • valve seals 8 and 10 are advantageously spring biased by an armature spring 13 for sealing engagement with their respective valve seat 9 and 11, respectively.
  • the armature 7 is magnetically conductive, d. H. made of ferromagnetic material; in the axial direction A closes to a first side of a first core 12, in which according to this embodiment, the pressure input 2a and the first pressure outlet 2b are formed, and to the other, second side of a second core 14, in which the second pressure outlet 2c for the vent is formed.
  • a magnetic device 15 Radially outside the armature guide tube 6, a magnetic device 15 is arranged, which has a permanent magnet means 16 and an electromagnet means 17, wherein the electromagnet means 17 in turn with a first coil 18 and a second coil 19 is formed.
  • the entire magnet device 15 in a magnetic yoke 20, 21 is received, which is formed by a Jochtopf 20 with pot bottom 20a and cylindrical pot wall 20b and the Jochtopf 20 to an axial side closing yoke disc 21.
  • the two cores 12 and 14 are advantageously in the radial direction R directly to the yoke disc 21 and the Jochtopf 20, ie without a radial air gap. Furthermore, the armature 7 lies in its two armature positions or positions directly in the axial direction A or -A on one of the two cores 12, 14 and has an air gap 22 to the respective other core 14, 12. Thus lies in the in Fig.
  • the armature 7 is in the second position II, not shown here directly to the second core 14, ie also without an air gap, in which case an air gap between the armature 7 and the first core 12 is formed.
  • the permanent magnet device 16 is advantageously arranged axially between the first coil 18 and the second coil 19 and radially magnetized, ie the magnetization and thus the magnetic flux lines of the permanent magnetic field PM extend in the radial direction R, z. B. radially outward, ie perpendicular to the axis A.
  • Fig. 4 5 different configurations of the permanent magnet device 16 possible.
  • Fig. 4 are z. B. four individual permanent magnets 16a, 16b, 16c and 16d provided, each of which is elongated and extending in each case in a radial direction, ie perpendicular to the axis A, each having the same polarity, for. B. one to the armature guide tube 6 facing north pole N and to the radially outer pot wall 20b of the yoke pot 20 facing south pole S, or vice versa.
  • a permanent magnet disc 16e is provided, which is designed as a ring or disc and in this case is magnetized in the radial direction.
  • the permanent magnet device 16 is formed outside the armature guide tube 6, it can also be formed with a wider axial extent, so that conventional materials for permanent magnets, for. As an iron alloy or a ceramic material used; the use z. B. rare earth is not required in principle.
  • the common permanent magnetic field PM thus extends in the radial direction R through the permanent magnet means 16 and subsequently through the yoke 20, 21, being axially in both directions, i. -A and A run, i. along the pot wall 20b as first permanent magnet field PM1 and second permanent magnet field PM2, the permanent magnet fields PM1, PM2 then extending radially downwards along the pot bottom 20b and the yoke disc 21 to the cores 210, 21 at the axial ends, and subsequently axially, i. in the direction of A or -A, to the armature 7 and back to the permanent magnet device 16th
  • the two permanent magnetic fields PM1, PM2 can thus each z. B. have approximately the shape of a torus; the entire permanent magnetic field PM is thus z. B. a double torus or dumbbell-shaped.
  • the magnetically conductive armature 7 is located on the first core 12, so that in this case the first permanent magnetic field PM1 extends directly from the first core 12 through the armature 7, and in the armature 7 in the axial direction to the permanent magnet device 16.
  • An air gap is formed at best as a radial air gap between the armature 7 and the permanent magnet means 16, but not as an axial gap, so that the first permanent magnetic field PM1 forms a strong magnetic holding force of the armature 7 on the first core 12.
  • the extending through the second core 14 second permanent magnetic field PM2 passes through the air gap 22 to the armature 7 and is significantly weakened by the air gap 22.
  • the magnetic holding force of the first permanent magnetic field PM1 is significantly larger than the attractive force of the second permanent magnetic field PM2; the armature 7 is in the right position, ie the anchor position I of Fig. 1 , kept safe.
  • bistable magnetic valve 1 Since the bistable magnetic valve 1 is basically symmetrical in the axial direction A with respect to the formation of the two cores 12 and 14 and the coils 18 and 19, the in Fig. 1 not shown second armature position II held securely, since here an air gap is formed correspondingly between the armature 7 and the first core 12, which weakens the first permanent magnetic field PM1, however, there is a strong second permanent magnetic field PM2.
  • the first coil 18 generates a first electromagnetic field EM1; Accordingly, the second coil 19 generates a second electromagnetic field EM2, which overlap with the permanent magnetic fields PM1, PM2 and each other.
  • the first electromagnetic field EM1 of the first coil 18 is also toroidal in shape and extends substantially corresponding to the first permanent magnetic field PM1, in particular in rotationally symmetrical design of the permanent magnetic field PM1 after Fig. 5 :
  • the first electromagnetic field EM1 initially runs within the first coil 18, ie in the axial direction A - depending on the current supply - from the first core 12 in the axial direction inwards or outwards, ie, for example from the outside (in FIG Fig. 1 right) inwardly to the armature 7, and from the armature 7 radially outwardly, ie along the permanent magnet means 16 outwardly, and from there along the pot wall 20b and the cup bottom 20a radially inwardly back to the first core 12.
  • the second electromagnetic field EM2 similar to the second permanent magnetic field PM2, ie - depending on the polarity - of the second core 14 in the axial direction A to the armature 7 back, or in the opposite direction from the armature 7 to the second core 14 out , and in each case in the radial direction radially outwards along the permanent magnet device 16, the pot wall 20b in the axial direction, and along the yoke plate 21 radially inwardly.
  • For the second switching operation SV2 of the first armature position I of Fig. 1 Based on a first electromagnetic field EM1 of the first coil 18 is constructed, which is the first permanent magnetic field PM1 opposite and this particular partially compensated, so that the magnetic holding force of the armature 6 on the first core 12 is already at least reduced.
  • the second coil 19 is energized such that the second permanent magnetic field PM2 is amplified by the second electromagnetic field EM2, ie both fields PM2 and EM2 point in the same direction, so that in spite of the air gap 22 acting on the armature 7, in Fig. 1 towards the left magnetic force increases and the armature 7 in Fig. 1 adjusted to the left, causing the air gap 22 is reduced and disappears completely, and an air gap between the armature 7 and the first core 12 is formed.
  • one of the electromagnetic fields EM1 and EM2 is compensating and the other switching.
  • a first current I1 guided by the first coil 18 acts compensatingly, ie as a compensating first current I1_k, and a second current I2 conducted through the second coil 19 switches, ie as a switching second current I2_s.
  • a compensating second current I2_k is passed through the second coil 19, and a first current I1_s is conducted through the first coil 18.
  • the two coils 18 and 19 are connected via coil terminals 61a, b and 62a, b to respective circuit arrangements 30, 35.
  • the two coils 18 and 19 can according to the in Fig. 6 a) and b) shown embodiments of a control device 40 controlled by a circuit arrangement 30, which in particular represents an output stage, are energized together, as a parallel connection or series connection.
  • a solenoid valve device 5 is formed, which has the bistable solenoid valve 1, the circuit arrangement 30 and the control device 40.
  • first current I1_k can cause the compensating, z. B.
  • first electromagnetic field EM1 is too strong and the difference EM1 - PM1 can be greater in magnitude than the positively overlapping, but weakened by the air gap 22, switching second overall field EM2 + PM2.
  • At least the compensating current I1_k or I2_k is variable in time, z. B. ramped up, advantageously via a ramp and / or with discrete increase.
  • both currents can thus be ramped up with a time delay. This can be over in Fig. 6 a) or b) shown circuitry 30 done.
  • Tr1 OFF
  • Tr4 OFF
  • Tr2 ON
  • Tr3 ON to the supply voltage Uv over Tr2 and the series connection of the coils 18 and 19 and Tr3 to ground GND to lead.
  • the Amperewindungen AW are drawn, resulting in the product of the current and the number of turns, the starting-shift duration .DELTA.t1 between t2 and t1 is z. B.
  • ⁇ t2 50 to 70 ms
  • the total switching time .DELTA.t2 between t3 and t1 is z.
  • B. ⁇ t2 100 ms.
  • Fig. 8b shows an alternative control in which at time t1, the current is driven immediately to a mean current value I_mid, and subsequently with a linear ramp up to the time t2 to the maximum value I_max until it is turned off again at time t3.
  • the switching periods ⁇ t1 and ⁇ t2 can have similar values as in Fig. 8a accept.
  • first in the first position I of Fig. 1 weak first electromagnetic field EM1 is formed, which fully or partially compensates the holding permanent magnetic field, here thus the first permanent magnetic field PM1, but only at time t1 reaches the maximum current value I_max.
  • the starting shift duration .DELTA.t1 is sufficient to achieve a mechanical adjustment of the armature 7 away from the first armature position I; as soon as an air gap forms between the armature 7 and the first core 12, the risk of unintentional holding in the first armature position I has already been significantly reduced.
  • Fig. 7 shows a circuit arrangement 35, which can be realized without a time ramp, with driving of the transistors, in particular MOSFETs T1, T2, T3, T4, T5, T6, which are provided as itside transistors T1 and T2 and Loside transistors T3 to T6, over Hiside control signals Si1 and Si 2 and Loside- control signals Si3, Si4, Si5, Si6.
  • MOSFETs T1, T2, T3, T4, T5, T6 which are provided as itside transistors T1 and T2 and Loside transistors T3 to T6, over Hiside control signals Si1 and Si 2 and Loside- control signals Si3, Si4, Si5, Si6.
  • SV1 For both switching operations SV1, SV2 is in each case the compensating, weaker electromagnetic field, ie in Fig. 1 respectively.
  • Fig. 3 the first electromagnetic field EM1, according to only partially controlled. This can advantageously take place via PWM, wherein the activation by switching states ON, OFF and to form a power current between the minimum and maximum value, the control via PWM, ie temporary control occurs.
  • Fig. 7a shows the circuit
  • Fig. 7b supplementary the following table of activation phases switching operation Si1 Si2 Si3 Si4 Si5 si6 SV1 (II ⁇ I) ON OFF OFF 100% OFF 25% SV2 (I ⁇ II) OFF ON 25% OFF 100% OFF
  • the percentages refer to the PWM drive, i. the proportion of "ON” or transistor modulation; the value 25% thus stands in particular for a PWM control in which 25% of the clock period "ON" is present.
  • SV1 is the first switching operation for setting the first armature position I, SV2 corresponding to the second switching operation for setting the second armature position II.
  • Fig. 7c) and Fig. 7d Graphically illustrates the current paths in the two switching operations SV1 and SV2, with the switching currents I1_s and I2_s and compensating currents I1_k and I2_k, in addition z.
  • the diodes D1, D2, D3, D4, D5, D6, D7, D8 are used in the circuit arrangement 35 of Fig. 7 the prevention of reverse currents and the possibility of freewheeling currents of the coils 18 and 19.
  • Fig. 2 shows an evolution of the Fig. 1 in which a pole tube 28 is additionally provided radially between the permanent magnet device 16 and the armature 7, or the armature guide tube 6, for a better transition allow the field lines and the permanent magnetic field in the armature 7.
  • FIGS. 9 and 10 show a detailed design of a solenoid valve 1 accordingly Fig. 1 or 2 ,
  • the permanent magnet device 16 is here opposite for illustrative purposes Fig. 1 and 2 reversed polarity used.
  • Compressed air 25a is from a compressed air supply 25, z. B. a compressed air reservoir, fed via a compressed air supply line 23 to the pressure input 2a, and passed over the first pressure output 2b and a pressure output line 26 to a consumer 24.
  • a pressure outlet 27 is attached directly or indirectly via a conduit.
  • the compressed air applied to the pressure inlet 2a and the inner bore 42 of the first core 12 is blocked at the closed first valve, ie between the first valve seat 9 and the first valve seal 8.
  • Compressed air 25a can from the consumer 24 via the pressure-output line 26, the first pressure outlet 2b, then via an outer axial bore 43 of the core 12, an interior 29 of the armature 7, in which preferably also z.
  • the inner armature spring 13 is provided, and are guided over the axial gap 22 of the open second valve 10,11 and the bore 14a of the second core 14 to the second pressure outlet 2c and thus to the pressure outlet 27 for venting.
  • the second valve 10, 11 is thus open, since the second valve seat 11 is separated from the second valve seal 10 by the axial gap 22.
  • the first valve 8, 9 is open, ie the axial gap 22 is formed between the first valve seat 9 and the first valve seal 8. Accordingly, that is second valve 10, 11 closed by the second valve seat 11 rests on the second valve seal 10. Compressed air 25a is thus from the compressed air supply 25 via the compressed air supply line 23, the pressure inlet 2a, the inner bore 42, the open first valve 8, 9, the axial gap 22, the radially outer bore 43 to the first pressure outlet 2b and thus to the Consumer 24 led.
  • the bores 42, 43 in the first core 12 are advantageously formed by the first core 12 is formed with an inner tube 12 a and an outer tube 12 b, between which at least in some areas of the circumference, the outer axial bore 43 is formed; the inner bore 42 is formed by the central bore of the inner tube 12a.
  • the armature 7 is formed according to the embodiment shown here by a first anchor part 7a and a second anchor part 7b, the z. B. be joined together by press fitting; the armature spring 13 presses the valve seals 8 and 10 apart axially.
  • the armature 7 can thus be joined with an armature interior 29 which, as described above, serves as an air duct for the ventilation.
EP16000656.5A 2015-04-25 2016-03-17 Systeme de couplage et procede de commande d'une electrovanne bistable pour un systeme fluidique Active EP3089177B1 (fr)

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DE102015005333.7A DE102015005333A1 (de) 2015-04-25 2015-04-25 Schaltungsanordnung und Verfahren zur Ansteuerung eines bistabilen Magnetventils für ein Fluidsystem

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EP3089177A1 true EP3089177A1 (fr) 2016-11-02
EP3089177B1 EP3089177B1 (fr) 2018-01-03

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Publication number Priority date Publication date Assignee Title
DE102021111032A1 (de) * 2021-04-29 2022-11-03 Samson Aktiengesellschaft Elektromagnetischer Antrieb für beispielsweise ein 3/2-Wegeventil und 3/2-Wegeventil

Citations (6)

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Publication number Priority date Publication date Assignee Title
DE3730381A1 (de) 1987-09-10 1989-03-30 Kuhnke Gmbh Kg H Bistabiles magnetventil mit dauermagnetischer haltekraft
EP0328194A1 (fr) 1988-02-08 1989-08-16 Magnavox Electronic Systems Company Mécanisme de soupape entraîné par énergie potentielle-magnétique
DE4415068A1 (de) * 1994-04-29 1995-11-02 Festo Kg Bistabiles Magnetventil
DE102007063479A1 (de) * 2007-12-20 2008-11-20 Siemens Ag Verfahren und Schaltungsanordnung zum Erzeugen eines eine Endlage eines Elektromagneten anzeigenden Signals
US7483254B1 (en) 2007-09-24 2009-01-27 Wang Guangshun Control circuit of a bistable permanent magnet operating mechanism
DE102008022953A1 (de) * 2008-05-09 2009-11-26 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Vorrichtung und Verfahren zum Betreiben und Überwachen eines Magnetventils einer elektrischen Feststellbremse

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4751487A (en) * 1987-03-16 1988-06-14 Deltrol Corp. Double acting permanent magnet latching solenoid
DE102010001914A1 (de) * 2010-02-15 2011-08-18 Robert Bosch GmbH, 70469 Lenkvorrichtung für ein Kraftfahrzeug

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3730381A1 (de) 1987-09-10 1989-03-30 Kuhnke Gmbh Kg H Bistabiles magnetventil mit dauermagnetischer haltekraft
EP0328194A1 (fr) 1988-02-08 1989-08-16 Magnavox Electronic Systems Company Mécanisme de soupape entraîné par énergie potentielle-magnétique
DE4415068A1 (de) * 1994-04-29 1995-11-02 Festo Kg Bistabiles Magnetventil
US7483254B1 (en) 2007-09-24 2009-01-27 Wang Guangshun Control circuit of a bistable permanent magnet operating mechanism
DE102007063479A1 (de) * 2007-12-20 2008-11-20 Siemens Ag Verfahren und Schaltungsanordnung zum Erzeugen eines eine Endlage eines Elektromagneten anzeigenden Signals
DE102008022953A1 (de) * 2008-05-09 2009-11-26 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Vorrichtung und Verfahren zum Betreiben und Überwachen eines Magnetventils einer elektrischen Feststellbremse

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