EP1165944A1 - Procede permettant de determiner la position d'un induit - Google Patents

Procede permettant de determiner la position d'un induit

Info

Publication number
EP1165944A1
EP1165944A1 EP00918683A EP00918683A EP1165944A1 EP 1165944 A1 EP1165944 A1 EP 1165944A1 EP 00918683 A EP00918683 A EP 00918683A EP 00918683 A EP00918683 A EP 00918683A EP 1165944 A1 EP1165944 A1 EP 1165944A1
Authority
EP
European Patent Office
Prior art keywords
coil
current
determined
armature
voltage drop
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.)
Granted
Application number
EP00918683A
Other languages
German (de)
English (en)
Other versions
EP1165944B1 (fr
Inventor
Joachim Melbert
Stefan Butzmann
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1165944A1 publication Critical patent/EP1165944A1/fr
Application granted granted Critical
Publication of EP1165944B1 publication Critical patent/EP1165944B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • F01L9/40—Methods of operation thereof; Control of valve actuation, e.g. duration or lift
    • F01L2009/409—Determination of valve speed
    • 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
    • F01L2201/00—Electronic control systems; Apparatus or methods therefor
    • 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
    • H01F7/123—Guiding or setting position of armatures, e.g. retaining armatures in their end position by ancillary coil

Definitions

  • the invention relates to a method for determining the position of an armature, which is assigned to an electromechanical actuator.
  • the actuator is assigned to an actuator which preferably has a gas exchange valve of an internal combustion engine as the actuator.
  • a known actuator (DE 195 26 683 AI) has a gas exchange valve and an actuator.
  • the actuator has two electromagnets, between which an armature plate can be moved against the force of a restoring means by switching off the coil current on the holding electromagnet and switching on the coil current on the capturing electromagnet.
  • the coil current of the respective capturing electromagnet is kept constant by a predefined catch value for a predefined period of time and then regulated to a stop value by a two-point regulator with hysteresis.
  • EP 0 493 634 AI To determine the position of the anchor plate, it is known from EP 0 493 634 AI to provide an optical sensor which is arranged in the electromagnet and which detects the position of the anchor plate.
  • EP 0 493 634 AI To determine the position of the anchor plate, it is known from EP 0 493 634 AI to provide an optical sensor which is arranged in the electromagnet and which detects the position of the anchor plate.
  • such a sensor requires space that is only available to a very limited extent and requires expensive cabling.
  • the object of the invention is to provide a method for determining the position of an anchor that is simple and reliable.
  • the magnetic flux depends on a negligible leakage flux and a non-saturated magnetic circuit only on the current through the coil, and from the position of the anchor plate.
  • U L is the inductive voltage drop across the coil, which is advantageously the difference between the measured voltage drop across the coil minus the voltage drop resulting from multiplying the ohmic resistance of the coil by the current through the coil.
  • A is the contact surface of the core of the electromagnet on which the armature plate comes to rest
  • ⁇ is the number of turns of the coil
  • I is the current through the coil
  • s is the position of the armature plate
  • ⁇ Q is the permeability of the air
  • K is a constant. The position s is equal to the sum of the constant K and the length of the air gap between the anchor plate and the core.
  • Equating equations (1) and (2) and solving for position s results in:
  • Equation (4) can be used to easily determine the position of the armature plate as a function of the magnetic flux and the current through the coil.
  • FIG. 2 shows a circuit arrangement in the control device
  • FIG. 3 shows a flow diagram of a program for determining the position s of the anchor plate
  • Figure 4 is a flowchart of a program for determining the ohmic resistance of the coil.
  • An actuator ( Figure 1) comprises an actuator 1 and an actuator, which is preferably designed as a gas exchange valve 2.
  • the gas exchange valve 2 has a shaft 21 and a plate 22.
  • the actuator 1 has a housing 11 in which a first and a second electromagnet are arranged.
  • the first electromagnet has a first core 12 which is provided with a first coil 13.
  • the second electromagnet has a second core 14 which is provided with a second coil 15.
  • An anchor is provided, the anchor plate in the housing 11 is movably arranged between a first contact surface 15a of the first electromagnet and a second contact surface 15b of the second electromagnet.
  • the anchor plate 16 is thus movable between a closed position s maxS and an open position s max0 .
  • the armature further comprises an armature shaft 17 which is guided through recesses in the first and second core 12, 14 and which can be mechanically coupled to the shaft 21 of the gas exchange valve 2.
  • the actuator 1 is rigidly connected to the cylinder head 31 and the internal combustion engine.
  • a control device 4 is provided which detects signals from sensors and preferably communicates with a higher-level control device for engine operating functions and receives control signals from the latter.
  • the control device 4 controls the first and second coils 13, 15 of the actuator 1 depending on the signals from the sensors and the control signal.
  • the control device 4 comprises a control unit 41, in which the control signals for the coils 13, 15 are determined, and a first power output stage 42 and a second power output stage 43. Furthermore, the control device 4 comprises an evaluation unit, in which the ohmic resistance of the coils 13, 15 and the position of the anchor plate 16 can be determined. The first power output stage 42 and the second power output stage 43 amplify the control signals.
  • the control unit 41 has a first regulator, the command variable of which is the current or a voltage corresponding to the current through the first coil 13.
  • a higher-level controller can also be provided, which depends on the position tion of the anchor plate generates the reference variable for the first controller.
  • the control unit 41 further comprises a second controller, the controlled variable of which is the current through the second coil 15 or a corresponding voltage and which generates corresponding control signals for controlling the power output stages.
  • the first electromagnet and the second electromagnet are arranged symmetrically with respect to the rest position of the armature plate in the actuator 1.
  • the first and second regulator differ only in that the first regulator regulates the current through the first coil 13 and the second regulator regulates the current through the second coil.
  • the first power output stage 42 and the second power output stage 43 have the same structure and the same circuit arrangement of their components. They differ only in that the first power output stage for driving the first coil 13 and the second power output stage 43 are provided for driving the second coil.
  • the elements arranged in the evaluation unit 44 are each provided once for the first electromagnet and once for the second electromagnet, but their function is identical.
  • a circuit arrangement (FIG. 2) in the control device 4 comprises a two-point regulator, which comprises a first resistor R1, a second resistor R2, a first comparator Ki and a second comparator K 2 and also an RS flip-flop 411.
  • the output Q of the RS flip-flop 411 is connected to the first power output stage 42, the output of which is led to the control input of a first power transistor Ti.
  • a half-bridge circuit arrangement is provided which comprises the first transistor Ti, a second transistor T 2 , a measuring resistor R s and diodes Di and D 2 and which is electrically conductively connected to the coil 13 which has the inductance L and the ohmic resistor R AK ⁇ includes.
  • the diode D 2 is a free-wheeling diode.
  • the current I s through the coil 13 is detected when the transistor T 2 is switched on and is proportional to an actual value U IST of the voltage potential at the tap of the current measuring resistor R s . Furthermore, a current measuring device 45 is provided which generates a signal which represents the current I s through the coil 13.
  • the switching threshold of the comparator Kl is the setpoint U ⁇ , So ⁇ of the voltage potential at the tap of the current measuring resistor R s .
  • the switching shaft of the comparator K2 is the nominal value U I / So ⁇ of the voltage potential at the tap of the current measuring resistor R ⁇ multiplied by the ratio of the resistor R 2 to the sum of the resistors Ri and R 2 . Accordingly, the Q output of the RS flip-flop 411 is set to a low potential as soon as the actual value is greater than or equal to the nominal value of the voltage potential at the tap of the current measuring resistor R s .
  • the Q output of the RS flip-flop 411 is set to a high potential as soon as the actual value is less than or equal to the ratio of the resistance R 2 to the sum of the resistance Ri and R 2 multiplied by the target value U I / So i ⁇ of the voltage potential at the tap of the current measuring resistor R s .
  • the output stage 42 amplifies the output signal Q of the RS flip-flop 411 and thus drives the transistor Ti. If both the transistors Ti and T 2 are controlled to be conductive, the entire supply voltage U B at the coil 13 drops. If the transistor Ti is subsequently blocked, the diode D2 becomes conductive in freewheeling and only the forward voltage of the diode D2 drops at the coil 13.
  • a differential amplifier XI is also provided, which taps the voltage drop U S p at the coil 13.
  • the output of the differential amplifier XI is routed via a switch Z to a low-pass filter, which comprises a resistor R 3 and a capacitor Ci and at whose output the average voltage drop U IiAKT is present across the coil 13.
  • a program for determining the position of the anchor plate 16 and the anchor is described below with reference to the flow chart of FIG. 3. The method is started in a step S1.
  • the magnetic flux ⁇ through the coil 13 is initialized with the value zero.
  • step S3 it is checked whether the current I s through the coil has changed from a zero value OFF to any current value ON since the program was last run through in step S3. If the condition of step S3 is fulfilled, the processing is continued in a step S4. However, if the condition of step S3 is not met, it is checked again after a predetermined waiting period.
  • step S4 the inductive voltage drop U L across the coil 13 is determined from the difference between the voltage drop U SP and the product of the ohmic resistance R AK ⁇ of the coil 13 and the current I s through the coil 13. The inductive voltage drop U L can thus be determined in a simple manner from the measured quantities of the current I s through the coil and the voltage drop U SP at the coil.
  • the resistance R AK ⁇ on the coil is either stored as a fixed, predetermined value in the evaluation device or is preferably determined by means of a program according to FIG. 4 with the advantage that the resistance can be determined with high accuracy regardless of the operating temperature and the operating time of the actuator .
  • the magnetic flux ⁇ is then determined in a step S5 in accordance with equation (1).
  • the current magnetic flux ⁇ is preferably calculated from the magnetic flux ⁇ during the last run of step S5, the current inductive voltage drop U L and the time period between the successive calculation runs of step S5 using a numerical integration method.
  • the position s of the anchor plate 16 is determined in accordance with equation (4).
  • step S3 ensures that the position S is always determined when the armature plate 16 moves towards the coil 13. This ensures that the position s can be determined particularly precisely in the vicinity before the anchor plate 16 strikes the first contact surface 15a.
  • a corresponding program for determining the position s is started, which measures the coil current through the second coil 15, the inductive voltage drop at the second coil 15 and the ohmic w evaluates the status of the second coil.
  • a program for determining the ohmic resistance R A ⁇ of the first coil 13 is started in a step S15.
  • a step ⁇ 16 it is checked whether the position s of the anchor plate is the same as the closed position S ⁇ XS or the open position S ⁇ XO or the distance of the armature from the coil to be evaluated (here first coil 13) is greater than or equal to half the distance between the closed position S M ⁇ XS and the open position S MAXO - If one of these conditions is met, it is ensured that the inductance L of the coil 13 changes only negligibly.
  • step S16 If one of the first two conditions is met, it is ensured that the armature plate is at rest and thus the inductance of the coil 13 remains unchanged during the further execution of the program for determining the ohmic resistance. If the third condition is met, it is ensured that the distance of the anchor plate 16 from the first contact surface 15a is so large that at When the armature plate 16 moves toward the second contact surface 15b, the inductance of the coil 13 remains almost unchanged. If none of the conditions of step S16 is met, step S16 is carried out again after a predetermined waiting period. However, if one of the conditions of step S16 is met, then a step S17 checks whether the current I s through the coil 13 is approximately constant.
  • step S19 there is a wait for a predetermined measuring time period ⁇ t. Then in a step S20
  • the program is stopped in a step S22.
  • the procedure according to the program according to FIG. 4 has the advantage that during the operation of the actuator, the currently valid ohmic resistance R AKT of the coil 13 can be determined with high accuracy.
  • the program according to FIG. 4 is preferably carried out again at fixed, predetermined time intervals during the operation of the actuator 1. If the
  • the current I s through the coil 13 has a known predetermined value when steps S15 to S22 are carried out, the current I s can be dispensed with and the resistance can be determined in step S21 with a stored value I s of the current.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

Mécanisme de commande électromécanique comportant au moins un électro-aimant doté d'une bobine et un induit possédant une plaque d'induit qui est mobile entre une première surface d'appui située sur l'électro-aimant et une seconde surface d'appui. La position (s) de l'induit est déterminée par la bobine en fonction du flux magnétique (Ζ) et du courant (Is).
EP00918683A 1999-03-30 2000-03-03 Procede permettant de determiner la position d'un induit Expired - Lifetime EP1165944B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19914467 1999-03-30
DE19914467 1999-03-30
PCT/DE2000/000676 WO2000060220A1 (fr) 1999-03-30 2000-03-03 Procede permettant de determiner la position d'un induit

Publications (2)

Publication Number Publication Date
EP1165944A1 true EP1165944A1 (fr) 2002-01-02
EP1165944B1 EP1165944B1 (fr) 2006-05-17

Family

ID=7902986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00918683A Expired - Lifetime EP1165944B1 (fr) 1999-03-30 2000-03-03 Procede permettant de determiner la position d'un induit

Country Status (5)

Country Link
US (1) US6518748B2 (fr)
EP (1) EP1165944B1 (fr)
JP (1) JP2002541656A (fr)
DE (1) DE50012773D1 (fr)
WO (1) WO2000060220A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019025038A1 (fr) * 2017-08-02 2019-02-07 Ilmenauer Mechatronik GmbH Procédé et dispositif pour la surveillance de la position finale de l'induit d'un actionneur électromagnétique
US10378475B2 (en) 2015-06-12 2019-08-13 Cpt Group Gmbh Method for determining a reference current value for actuating a fuel injector
US10563633B2 (en) 2015-04-15 2020-02-18 Vitesco Technologies GmbH Determining a lift of a solenoid valve

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DE10002322C1 (de) * 2000-01-20 2001-08-30 Siemens Ag Verfahren zum Steuern eines Stellgeräts
DE10150199A1 (de) * 2001-10-12 2003-04-24 Wolfgang E Schultz Verfahren und Schaltung zur Erkennung der Ankerlage eines Elektromagneten
ITBO20010760A1 (it) * 2001-12-14 2003-06-16 Magneti Marelli Powertrain Spa Metodo per la stima della posizione e della velocita' di un corpo attuatore in un azionatore elettromagnetico per il comando di una valvola
US7483253B2 (en) * 2006-05-30 2009-01-27 Caterpillar Inc. Systems and methods for detecting solenoid armature movement
US7405917B2 (en) * 2006-06-16 2008-07-29 Festo Ag & Co. Method and apparatus for monitoring and determining the functional status of an electromagnetic valve
US7837585B2 (en) * 2006-11-27 2010-11-23 American Axle & Manufacturing, Inc. Linear actuator with position sensing system
US7746620B2 (en) * 2008-02-22 2010-06-29 Baxter International Inc. Medical fluid machine having solenoid control system with temperature compensation
US9435459B2 (en) 2009-06-05 2016-09-06 Baxter International Inc. Solenoid pinch valve apparatus and method for medical fluid applications having reduced noise production
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DE102012218393A1 (de) * 2012-10-09 2014-04-10 E.G.O. Elektro-Gerätebau GmbH Verfahren zur Überwachung eines Gasventils, Steuerung für ein Gasventil und Gaskochgerät
DE102014222437A1 (de) 2014-11-04 2016-05-04 Robert Bosch Gmbh Verfahren zum Bestimmen und/oder Regeln eines Ventilschieberwegs eines hydraulischen Stetigventils
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FR3112650B1 (fr) * 2020-07-20 2023-05-12 Schneider Electric Ind Sas Procédé de diagnostic d’un état de fonctionnement d’un appareil de commutation électrique et appareil de commutation électrique pour la mise en œuvre d’un tel procédé

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10563633B2 (en) 2015-04-15 2020-02-18 Vitesco Technologies GmbH Determining a lift of a solenoid valve
US10378475B2 (en) 2015-06-12 2019-08-13 Cpt Group Gmbh Method for determining a reference current value for actuating a fuel injector
WO2019025038A1 (fr) * 2017-08-02 2019-02-07 Ilmenauer Mechatronik GmbH Procédé et dispositif pour la surveillance de la position finale de l'induit d'un actionneur électromagnétique
DE102017117487A1 (de) * 2017-08-02 2019-02-07 Kendrion (Villingen) Gmbh Verfahren und Vorrichtung zur Ankerendlagenüberwachung eines elektromagnetischen Aktors

Also Published As

Publication number Publication date
US20020097120A1 (en) 2002-07-25
WO2000060220A1 (fr) 2000-10-12
US6518748B2 (en) 2003-02-11
DE50012773D1 (de) 2006-06-22
JP2002541656A (ja) 2002-12-03
EP1165944B1 (fr) 2006-05-17

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