EP0718556B1 - Verfahren zur Positionserfassung eines linear getriebenen Antriebssystems - Google Patents
Verfahren zur Positionserfassung eines linear getriebenen Antriebssystems Download PDFInfo
- Publication number
- EP0718556B1 EP0718556B1 EP95117559A EP95117559A EP0718556B1 EP 0718556 B1 EP0718556 B1 EP 0718556B1 EP 95117559 A EP95117559 A EP 95117559A EP 95117559 A EP95117559 A EP 95117559A EP 0718556 B1 EP0718556 B1 EP 0718556B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive system
- reference value
- running time
- value
- angular position
- 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
Links
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/08—Regulating air supply or draught by power-assisted systems
- F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/06—Air or combustion gas valves or dampers at the air intake
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/10—Air or combustion gas valves or dampers power assisted, e.g. using electric motors
Definitions
- the invention relates to a method for position detection of a linearly driven Drive system according to the preamble of claim 1.
- the method according to the invention is preferably used in burner flap drives Heating systems used. It can also be used advantageously in frequency converters.
- the invention has for its object to improve the known methods so that the Reliability of the drive systems is increased and the costs of the latter are reduced.
- a damper actuator and a frequency converter are used for safety reasons and / or several limit switches for calibration reasons in burner applications.
- the damper actuator in a burner application which is preferably an air damper actuator, at least four limit switches 1, 2, 3 and 4 functioning as mechanical limit switches (see Fig. 1) whose positions are adjustable.
- the frequency converter the are adjustable Limit switch z.
- a first limit switch 1 is, for. B. in one Angular position ⁇ 1, a second limit switch 2 in an angular position ⁇ 2, a third Limit switch 3 in an angular position ⁇ 3 and a fourth limit switch 4 in one Angular position ⁇ 4 arranged (see Fig. 1 and Fig. 2).
- the angular position ⁇ 1 is e.g. B. a closed position of the flap drive, ie the angular position in which the air flap is closed, which corresponds to an opening of the air flap of 0%.
- the angular position ⁇ 2 is z. B. a low-load position of the burner and corresponds to an opening of the air flap of x%.
- the angular position ⁇ 3 is z. B. an ignition load position of the burner and corresponds to an opening of the air flap of y%.
- the angular position ⁇ 4 is z. B. an open position of the flap drive, in which the air flap is fully open, which corresponds to an opening of the air flap of 100%.
- the limit switches 1 to 4 are in the inventive method, except from safety-related reasons, only for the purpose of verification and / or re-verification used. However, they are not used during normal operation of the drive system. There are also no other sensors and no additional limit switches, e.g. B. in Intermediate angular positions used. Since additional limit switches or sensors in the As a rule, they are expensive and prone to malfunctions, and costs are saved by not using them Operational reliability increased.
- the angular position change ⁇ that is to say the change in an angular path to be covered, is proportional to a respective travel time ⁇ t required for the angular position change ⁇ .
- the value of the angular velocity W of the drive system is determined with the aid of the two limit switches 1 and 4 and then stored for later use in each case when a setpoint value ⁇ t S belonging to a desired setpoint angle position ⁇ S is determined
- the time difference t 4 - t 1 is thus a measured transit time ⁇ t of the drive system in order to reach the angular position ⁇ 4 starting from the angular position ⁇ 1.
- FIG. 1 shows a possible course of the angular positions ⁇ of the drive system as a function of the time t.
- a possible time profile of the drive system during start-up is shown on the left by means of straight characteristic parts, while a possible time profile during normal operation of the drive system is shown on the right.
- the angular position ⁇ of the drive system fluctuates after commissioning z. B. between the angular positions ⁇ 4 and ⁇ 2. 1, the assumption applies that ⁇ 2 is smaller than ⁇ 3, but this is not always the case.
- the drive system has e.g. B.
- the angular position changes ⁇ of the drive system are, as already mentioned, proportional to its running time ⁇ t.
- a desired value ⁇ t S of the running time ⁇ t of the drive system associated with a desired setpoint angle position ⁇ S is determined and the drive system is then started and its running time ⁇ t is measured without sensors.
- the drive system is stopped, whose angular position ⁇ is then equal to the target value angular position ⁇ S , since the target value ⁇ t S is the running time ⁇ t of the drive system, which is the latter is required to reach the desired target angular position ⁇ S starting from an angular reference position.
- the angular reference position is e.g. B. the closed position ⁇ 1 of the flap actuator.
- it can also be any other arbitrary angular position ⁇ B of the flap drive in which it is currently located and from which it starts in order to achieve the desired setpoint angular position ⁇ S (see FIG. 3).
- the angular reference position ⁇ B is the position of the damper actuator before the last travel command.
- a microcomputer present in the drive system can be calculated using a table stored in it or using equation (2), whereupon the microcomputer after a subsequent start of movement of the drive system only has to measure the running time ⁇ t in order to achieve ⁇ t after reaching the running time setpoint S stop the drive system. The latter is then in the desired setpoint angle position ⁇ S without a sensor being required to detect that the position ⁇ S in question has been reached.
- the relevant values of ⁇ S and ⁇ t S are stored in the microcomputer and can be used as new start values for the sequence movement with the next sequence command.
- the drive system is cyclically started up at one of the four limit switches, e.g. B.
- a previously valid angular velocity W of the drive system is also multiplied by a correction factor k, which is a function f [D] of the setpoint / actual value difference D in order to obtain an angular velocity W E that is valid after the re-calibration, which is then subsequently used in the process, until the next re-calibration, in each case to determine the target value ⁇ t S of the running time ⁇ t.
- the microcomputer measures e.g. B. the actual value .DELTA.t E of the running time .DELTA.t, which the drive system needs to reach the angular position ⁇ 3 of the limit switch 3 from its current angular position ⁇ A.
- the difference D must be zero since both values should be the same. If not, not only the difference D is different from zero, but also the correction factor k is different from one.
- the selection of the limit switch to be cycled for re-calibration is preferably process-dependent.
- the cyclical limit switch that is selected is the one that can be approached the fastest by the drive system from the current position ⁇ A , ie that can be reached the fastest.
- the angular positions ⁇ of the drive system in the method according to the invention are preferably expressed in step numbers n.
- the angular positions ⁇ preferably correspond to speeds N.
- At is also proportional to AN.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Position Or Direction (AREA)
Description
Es zeigen
- Fig. 1
- ein Zeitdiagramm eines Messablaufs bei einem Klappen-Antrieb eines in einer Heizungsanlage vorhandenen Brenners,
- Fig. 2
- eine schematische Darstellung der Winkelpositionen von vier Grenzwertschaltern eines Antriebssystems,
- Fig. 3
- eine schematische Darstellung von Winkelpositionen beim erfindungsgemässen Verfahren und
- Fig. 4
- eine schematische Darstellung von Winkelpositionen bei einer Nachcichung.
Claims (7)
- Verfahren zur Positionserfassung eines linear getriebenen Antriebssystems, dessen Winkelpositions-Änderung (Δα) proportional seiner jeweiligen Laufzeit (Δt) ist, dadurch gekennzeichnet,dass ein zu einer gewünschten Sollwert-Winkelposition (αS) gehöriger Sollwert (ΔtS) der Laufzeit (Δt) des Antriebssystems ermittelt wird,dass das Antriebssystem anschliesend gestartet sowie seine Laufzeit (Δt) sensorlos gemessen wird unddass, wenn ein gemessener Wert der Laufzeit (Δt) gleich dem ermittelten Sollwert (ΔtS) der Laufzeit (Δt) ist, das Antriebssystem gestoppt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass vor einer ersten Inbetriebnahme des Antriebssystems ein Wert einer Winkelgeschwindigkeit (W) des Antriebssystems mit Hilfe zweier Grenzwertschalter (1, 4) ermittelt und gespeichert wird zwecks späterer Verwendung bei der jeweiligen Ermittlung des zur gewünschten Sollwert-Winkelposition (αS) gehörigen Sollwertes (ΔtS) der Laufzeit (Δt) des Antriebssystems.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass durch ein zyklisches Anfahren des Antriebssystems an einen von mehreren Grenzwertschaltern (3) eine Nacheichung erfolgt, indem jeweils einerseits eine Sollwert/Istwert-Differenz (D) eines ermittelten Sollwertes (ΔtS,E) und eines gemessenen Istwertes (ΔtE) einer Laufzeit (Δt) ermittelt wird, die erforderlich ist, um, ausgehend aus einer augenblicklichen Winkelposition (αA) des Antriebssystems, den Grenzwertschalter (3) zu erreichen, und anderseits eine bisher geltende Winkelgeschwindigkeit (W) des Antriebssystems mit einem Korrekturfaktor (k) multipliziert wird, der eine Funktion (f[D]) der Sollwert/Istwert-Differenz (D) ist, um eine nach der Nacheichung geltende Winkelgeschwindigkeit (WE) zu erhalten, die dann nachfolgend im Verfahren, bis zur nächsten Nacheichung, jeweils zur Ermittlung des Sollwertes (ΔtS) der Laufzeit (Δt) verwendet wird.
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Wahl des zyklisch anzufahrenden Grenzwertschalters prozessabhängig erfolgt.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass als zyklisch anzufahrender Grenzwertschalter derjenige ausgewählt wird, der vom Antriebssystem am schnellsten angefahren werden kann.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass ein Antrieb des Antriebssystems ein Schrittmotor ist und die Winkelpositionen (α) des Antriebssystems in Schrittanzahlen (n) ausgedrückt sind.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Antriebssystem ein Teil eines Frequenzumrichters ist und die Winkelpositionen (α) Drehzahlen (N) entsprechen.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH383094 | 1994-12-20 | ||
| CH3830/94 | 1994-12-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0718556A1 EP0718556A1 (de) | 1996-06-26 |
| EP0718556B1 true EP0718556B1 (de) | 1998-03-25 |
Family
ID=4264386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95117559A Expired - Lifetime EP0718556B1 (de) | 1994-12-20 | 1995-11-08 | Verfahren zur Positionserfassung eines linear getriebenen Antriebssystems |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5710725A (de) |
| EP (1) | EP0718556B1 (de) |
| DE (1) | DE59501700D1 (de) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2823140A1 (de) * | 1978-05-26 | 1979-11-29 | Kloeckner Humboldt Deutz Ag | Verfahren und vorrichtung zur einstellung einer definierten ruheposition eines drehrohres |
| DE2833463A1 (de) * | 1978-07-29 | 1980-02-07 | Servo Instr | Vorrichtung zur selbsttaetigen regelung des unterdrucks in dem verbrennungsraum einer feuerung |
| DE3018528C2 (de) * | 1980-05-14 | 1986-06-05 | MTC, Meßtechnik und Optoelektronik AG, Neuenburg/Neuchâtel | Verfahren und Vorrichtung zur Messung der Winkelgeschwindigkeit eines rotierenden Körpers |
| JPS5768697A (en) * | 1980-10-16 | 1982-04-27 | Janome Sewing Mach Co Ltd | Driving device for pulse motor |
| JPS59137680A (ja) * | 1983-01-25 | 1984-08-07 | Ube Ind Ltd | ステツピングモ−タ駆動形制御弁制御系統の自己診断方法 |
| CA1255186A (en) * | 1985-11-14 | 1989-06-06 | Patrick Tolley | Digital servo-valve |
| US4880376A (en) * | 1989-01-27 | 1989-11-14 | Honeywell Inc. | Method and apparatus for monitoring and calibrating damper position |
| JPH03204561A (ja) * | 1989-12-28 | 1991-09-06 | Matsushita Electric Ind Co Ltd | 温風暖房機 |
| JP2778207B2 (ja) * | 1990-05-16 | 1998-07-23 | 松下電器産業株式会社 | 温風暖房機 |
| JP2778206B2 (ja) * | 1990-05-16 | 1998-07-23 | 松下電器産業株式会社 | 燃焼空気調節装置 |
-
1995
- 1995-11-08 EP EP95117559A patent/EP0718556B1/de not_active Expired - Lifetime
- 1995-11-08 DE DE59501700T patent/DE59501700D1/de not_active Expired - Lifetime
- 1995-12-12 US US08/571,149 patent/US5710725A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0718556A1 (de) | 1996-06-26 |
| DE59501700D1 (de) | 1998-04-30 |
| US5710725A (en) | 1998-01-20 |
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