WO1998057080A1 - Verfahren und einrichtung zum steuern eines elektromechanischen stellgeräts - Google Patents
Verfahren und einrichtung zum steuern eines elektromechanischen stellgeräts Download PDFInfo
- Publication number
- WO1998057080A1 WO1998057080A1 PCT/DE1998/001569 DE9801569W WO9857080A1 WO 1998057080 A1 WO1998057080 A1 WO 1998057080A1 DE 9801569 W DE9801569 W DE 9801569W WO 9857080 A1 WO9857080 A1 WO 9857080A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- current
- electromagnet
- predetermined
- actuator
- rest position
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
- F16K31/0679—Electromagnet aspects, e.g. electric supply therefor with more than one energising coil
-
- 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
Definitions
- the invention relates to a method and a device for controlling an electromechanical actuator. It relates in particular to an actuator for controlling an internal combustion engine.
- a known actuator (US 5 350 153) has an actuator, which is designed as a gas exchange valve of an internal combustion engine, and an actuator.
- the actuator comprises a first electromagnet with a first core and a first coil and a second electromagnet with a second
- the first and second electromagnet are arranged in a housing at a predetermined distance.
- An armature plate is movably arranged between the first and second electromagnets and is biased into a predetermined rest position by a first and a second spring.
- the anchor plate is rigidly connected to a shaft of the gas exchange valve. In order to bring the armature plate into contact with the first electromagnet from its rest position, the first coil is excited with a pull-in current. The pull-in current causes an electromagnetic force that the
- Anchor plate pulls against a force caused by the first or second spring on the first electromagnet.
- the second coil is excited with a predetermined catch current.
- the first coil is not energized.
- the armature plate swings in the direction of the second electromagnet, caused by the spring force of the first and second springs.
- the electromagnetic force caused by the excitation of the second electromagnet compensates only causes losses due to friction in the springs and between the armature plate and the housing. In the known actuator it can happen that the anchor plate undesirably drops into its rest position. This is due to manufacturing tolerances or aging of the components.
- the object of the invention is to provide a method and a device for controlling an actuating device which ensures reliable operation of the actuating device.
- the invention is solved by the features of the independent claims.
- the solution has the advantage that the catching current can be set low. This keeps the losses in the first and second electromagnets low and prevents excessive heating of the electromagnet, which can lead to thermal destruction of the electromagnet.
- Another advantage is that reliable control is also ensured if disturbing forces act on the actuator. Such disturbing forces can be caused, for example, by strong vibrations.
- a holding current is corrected when a drop into the rest position is detected.
- the holding current can then advantageously be set to be low. It is then ensured that on the one hand the electromagnetic force caused by the holding current is sufficient to hold the armature plate in contact with the first or second electromagnet, but on the other hand that a small amount of heat loss is also generated.
- the high magnetic resistance due to the small air gap between the armature plate and the electromagnet would result in a very high thermal load on the actuator if the holding current were high.
- a start-up process is triggered after a drop in the anchor plate into the rest position has been detected. For this purpose, a start-up current is first corrected by a predetermined value and then the first and the second electromagnet are alternately supplied with current, approximately at the resonance frequency of the spring-mass system. This has the advantage that the availability of the actuator is increased.
- FIG. 1 shows an arrangement of an actuator in an internal combustion engine
- FIG. 2 shows a flow chart for controlling the actuator
- FIG. 3 shows a further flow chart for correcting the currents through the first or the second coil
- Figure 4 waveforms of the signals plotted over time t.
- An actuator 1 ( Figure 1) comprises an actuator 11 and an actuator, which is designed for example as a gas exchange valve and has a shaft 121 and a plate 122.
- the actuator 11 has a housing 111 in which a first and a second electromagnet are arranged.
- the first electromagnet has a first core 112, in which a first coil 113 is embedded in an annular groove.
- the second electromagnet has a second core 114, in which a second coil 115 is embedded in a further annular groove.
- the first core 112 has a recess 116a, which forms a guide for the shaft 121.
- the second core 114 has a further recess 116b, which also serves as a guide for the shaft 121.
- An anchor plate 117 is movably arranged in the housing 111 between the first core 112 and the second core 114.
- a first spring 118a and a second spring 118b bias the anchor plate into a predetermined rest position R.
- Actuator 1 is rigidly connected to a cylinder head 21.
- An intake port 22 and a cylinder 23 with a piston 24 are assigned to the cylinder head 21.
- the piston 24 is coupled to a crankshaft 26 via a connecting rod 25.
- a control device 4 which detects signals from sensors and generates control signals for the control device.
- the sensors are as a position sensor 5, which detects a position X of the armature plate 117, a first ammeter 7a, which detects the actual value I_AV1 of the current through the first coil 113, and a second ammeter 7b, which detects an actual value
- I_AV2 detects the current through the second coil 115 as a speed sensor 27, which detects the speed N of the crankshaft 25, or as a load detection sensor 28, which is preferably an air mass meter or a pressure sensor. In addition to the sensors mentioned, other sensors can also be present.
- drivers 6a, 6b are provided which amplify the control signals of the control device 4.
- the method for controlling the actuator is described with reference to FIGS. 2 and 3. It is irrelevant to the invention whether the method is executed in the form of a program in a microprocessor or whether a corresponding circuit arrangement is provided for this.
- the procedure can also be carried out in the form of one computing process or in the form of several computing processes.
- the method is started in a step S1 (FIG. 2).
- a step S2 an oscillation of the anchor plate 117 from its rest position R is controlled.
- the coils 113 and 115 are alternately energized, namely at the resonance frequency of the free spring-mass oscillator, which is formed by the first armature plate 117 and the first and second springs 118a, 118b.
- the coils 113, 115 are energized with a starting current I_A, which is also referred to as the starting current.
- the first or the second coil 113, 115 is energized with a holding current I_H, which causes an electromagnetic force which is sufficient to make the armature plate abut with the first or second core 112, 114 to keep.
- the first or the second coil 113, 115 can also be supplied with a holding current I_H after the position sensor 5 has detected that the position X of the armature plate 117 is a closed position C or an open position 0.
- the armature plate 117 is in the closed position when it is in contact with the first electromagnet and in the open position 0 when it is in contact with the second electromagnet.
- the actuator 11 can assume several operating states, such as the swinging up, catching and holding the anchor plate 117.
- a target value I_SP1 of the current through the first coil 113 is determined.
- the catching current or the holding current or the starting current is determined from a respective map and assigned to the setpoint I_SP1 of the current through the first coil 113.
- the maps are preferably dependent on the Speed N and the air mass flow MAF or the pressure MAP in the intake duct 22.
- a step S4 the actual value I_AV1 of the current through the first coil 113 is detected by the ammeter 7a.
- the difference between the setpoint I_SP1 and the actual value I_AV1 of the current through the coil 113 is the control difference which is fed to a controller with hysteresis in a step S5.
- the controller is preferably designed as a two-point controller with hysteresis.
- the manipulated variable of the controller is a voltage signal U1 which is fed to the driver 6a, which amplifies it and feeds it to the coil.
- a setpoint I_SP2 of the current through the second coil 115 is determined. This will depend on the
- the operating state of the actuator 11 and / or the position X of the armature plate 117, the catching current I_F or the holding current I_H or the starting current I_A is determined from a respective map and assigned to the setpoint I_SP2 of the current through the first coil 113.
- the characteristic diagrams are preferably dependent on the rotational speed N and the air mass flow MAF or the pressure MAP in the intake duct 22.
- a step S7 an actual value I_AV2 of the current through the second coil 115 is detected by a current meter 7b.
- the difference between the setpoint I_SP2 and the actual value I_AV2 of the current through the second coil 115 is the control difference that is supplied to the controller in step S8.
- the controller Depending on the control difference, the controller generates a voltage signal U2 which is fed to the driver 6b.
- the driver 6b amplifies the voltage signal U2 and applies it to the second coil 115.
- a step S9 it is checked whether an abort condition is met.
- the termination condition is preferably whether the internal combustion engine is in an operating state of the engine stop. If this is the case, the method is ended in step S10. If this is not the case, however, the method is continued in step S3. As an alternative, the method can then only be continued after a predetermined delay time in step S3.
- FIG. 3 shows a flow chart for correcting the capture current I_F, the holding current I_H and the starting current I_A.
- the steps of the flow chart are preferably processed by an interruption process which is called periodically (for example every 5 ms) quasi in parallel to the program of FIG. 2.
- step S14 The start takes place in a step S14.
- step S15 the position X of the anchor plate is detected by the position transmitter 5 and read.
- step S16 it is checked whether the amount of the difference between the position X and the rest position R is greater than a predetermined tolerance value DR. If this is the case, the process branches to step S19, in which a time value T is assigned the value zero becomes. However, if the condition of step S16 is not met, the time value T is increased by one in step S18.
- a step S21 it is checked whether the time value T is greater than a predetermined time period T_DIAG. If this is not the case, the method is ended in step S22 and the time value T is stored. However, if this is the case, a drop in the anchor plate 117 into the rest position R is detected. In a step S24, the capture current I_F is increased by a first adaptation value I_AD1.
- a step S25 it is checked whether the capture current I_F is greater than a maximum capture current I_F_MAX. If this is the case, then in step 26 an error in the control device recognized and the actuator is no longer activated. However, if the condition of step S25 is not met, the holding current is increased by a second adaptation value I_AD2 in step S27. In a step S28, the starting current I_A is increased by a third adaptation value I_AD2. In a step S29, a new oscillation is then controlled as in step S2, but with the corrected starting current I_A.
- the catch current I_F, the holding current I_H and the starting current I_A can alternatively also be corrected multiplicatively.
- Correction of the capture current I_F, the holding current I_H or the starting current I_A in steps S24, S27, S28 is carried out in a simple embodiment of the control device 4 by correcting all assigned map values. In another embodiment of the control device 4, only the map values associated with the current load and speed and those adjacent to them are corrected.
- FIG. 4a shows the manipulated variable of the two-point controller with hysteresis, which is a first voltage signal U1 and with which the first coil 113 is excited.
- FIG. 4b shows the assigned time profile of the actual value I_AV1 of the current through the first coil 113.
- FIG. 4c shows the time profile of the
- Control variable of the two-point controller with hysteresis for the second coil 115 is the voltage signal U2 with which the second coil 115 is excited.
- FIG. 4c shows the time course of the assigned actual value I_AV2 of the current through the second coil 115.
- FIG. 4e shows the time course of the position X of the armature plate 117.
- the setpoint I_SP1 for the current through the first coil 113 is the capture current I F.
- the armature plate 117 arrives System with the first core 112.
- the setpoint I_SP1 of the current through the coil is the holding current I_H.
- the time t 3 is preferably chosen so that it is as close as possible to the time t 2 .
- the impact of the anchor plate 117 is preferably determined by evaluating the position X. In a simple embodiment, the time interval between the times ti and t 3 can, however, also be determined experimentally and be a fixed, predetermined value.
- the setpoint I_SP1 of the current through the first coil 113 is zero.
- the anchor plate 117 detaches from the first core 112 and swings from it due to the force caused by the first and second springs 118a, 118b
- the setpoint value of the current through the second coil 115 is the capture current I_F.
- the magnetic force caused by the current through the second coil 115 pulls the armature plate 117 in the direction of the second core 114.
- the position X of the armature plate 117 is the closed position 0.
- a time tg and a time tg is the target value of the current through the second coil 115 of the holding current I_H.
- the actuator can also be designed as an injection valve.
- the method can be executed as a program by a microprocessor. However, it can also be implemented by a logic circuit or an analog circuit arrangement.
- the controller can also be designed, for example, as a single-point controller with a timing element or as a pulse width modulation controller.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98936120A EP0988483A1 (de) | 1997-06-12 | 1998-06-09 | Verfahren und einrichtung zum steuern eines elektromechanischen stellgeräts |
JP50131899A JP2002506504A (ja) | 1997-06-12 | 1998-06-09 | 電気機械式調整機器の制御のための方法および装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19724900A DE19724900C2 (de) | 1997-06-12 | 1997-06-12 | Verfahren und Einrichtung zum Steuern eines elektromechanischen Stellgeräts |
DE19724900.0 | 1997-06-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998057080A1 true WO1998057080A1 (de) | 1998-12-17 |
Family
ID=7832300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/001569 WO1998057080A1 (de) | 1997-06-12 | 1998-06-09 | Verfahren und einrichtung zum steuern eines elektromechanischen stellgeräts |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0988483A1 (de) |
JP (1) | JP2002506504A (de) |
DE (1) | DE19724900C2 (de) |
WO (1) | WO1998057080A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19832198A1 (de) * | 1998-07-17 | 2000-01-20 | Bayerische Motoren Werke Ag | Regelungsverfahren für die Endphasen-Bewegung eines Ankers eines elektromagnetischen Aktuators |
DE19832196A1 (de) * | 1998-07-17 | 2000-01-20 | Bayerische Motoren Werke Ag | Verfahren zur Reduzierung der Auftreffgeschwindigkeit eines Ankers eines elektromagnetischen Aktuators |
US6476599B1 (en) * | 1999-03-25 | 2002-11-05 | Siemens Automotive Corporation | Sensorless method to determine the static armature position in an electronically controlled solenoid device |
JP3508636B2 (ja) * | 1999-08-19 | 2004-03-22 | 日産自動車株式会社 | 電磁駆動吸排気弁の制御装置 |
DE10012047A1 (de) * | 2000-03-14 | 2001-09-20 | Heinz Leiber | Verfahren zur Steuerung einer elektromagnetischen Stelleinrichtung |
DE10037399A1 (de) * | 2000-08-01 | 2002-02-14 | Daimler Chrysler Ag | Verfahren zur Herstellung eines elektromagnetischen Aktuators |
FR2899347B1 (fr) * | 2006-04-04 | 2013-03-29 | Airbus France | Dispositif de commande d'une electrovanne |
JP2008116003A (ja) * | 2006-11-07 | 2008-05-22 | Toyota Motor Corp | 電磁駆動弁の制御装置、制御方法、その方法を実現するプログラムおよびそのプログラムを記録した記録媒体 |
CN112555427B (zh) * | 2020-12-11 | 2022-07-22 | 上海交通大学 | 制冷系统用电子节流装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6049106A (ja) * | 1983-08-26 | 1985-03-18 | Kayaba Ind Co Ltd | 電磁比例弁の制御装置 |
US5350153A (en) * | 1992-10-05 | 1994-09-27 | Aura Systems, Inc. | Core design for electromagnetically actuated valve |
EP0663552A1 (de) * | 1993-12-22 | 1995-07-19 | Westinghouse Electric Corporation | Diagnose System für Ventile welche elektromagnetisch gesteuert werden |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19521078B4 (de) * | 1995-06-09 | 2005-02-10 | Fev Motorentechnik Gmbh | Energiesparende elektromagnetische Schaltanordnung |
DE19522582C2 (de) * | 1995-06-16 | 1997-07-17 | Siemens Ag | Schaltungsanordnung zum Betrieb eines Elektromagneten |
DE19531437A1 (de) * | 1995-08-26 | 1997-02-27 | Fev Motorentech Gmbh & Co Kg | Verfahren zur Erfassung des Ventilspiels an einem durch einen elektromagnetischen Aktuator betätigten Gaswechselventil |
-
1997
- 1997-06-12 DE DE19724900A patent/DE19724900C2/de not_active Expired - Fee Related
-
1998
- 1998-06-09 JP JP50131899A patent/JP2002506504A/ja active Pending
- 1998-06-09 WO PCT/DE1998/001569 patent/WO1998057080A1/de not_active Application Discontinuation
- 1998-06-09 EP EP98936120A patent/EP0988483A1/de not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6049106A (ja) * | 1983-08-26 | 1985-03-18 | Kayaba Ind Co Ltd | 電磁比例弁の制御装置 |
US5350153A (en) * | 1992-10-05 | 1994-09-27 | Aura Systems, Inc. | Core design for electromagnetically actuated valve |
EP0663552A1 (de) * | 1993-12-22 | 1995-07-19 | Westinghouse Electric Corporation | Diagnose System für Ventile welche elektromagnetisch gesteuert werden |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 009, no. 179 (M - 399) 24 July 1985 (1985-07-24) * |
Also Published As
Publication number | Publication date |
---|---|
JP2002506504A (ja) | 2002-02-26 |
EP0988483A1 (de) | 2000-03-29 |
DE19724900A1 (de) | 1998-12-17 |
DE19724900C2 (de) | 1999-11-04 |
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