DE3813754A1 - Device for detecting the angular position of a rotatable body - Google Patents
Device for detecting the angular position of a rotatable bodyInfo
- Publication number
- DE3813754A1 DE3813754A1 DE19883813754 DE3813754A DE3813754A1 DE 3813754 A1 DE3813754 A1 DE 3813754A1 DE 19883813754 DE19883813754 DE 19883813754 DE 3813754 A DE3813754 A DE 3813754A DE 3813754 A1 DE3813754 A1 DE 3813754A1
- Authority
- DE
- Germany
- Prior art keywords
- triggering elements
- observation devices
- signal triggering
- rotation
- axis
- 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.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/24471—Error correction
- G01D5/24476—Signal processing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/486—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by photo-electric detectors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Vorrichtung der im Oberbegriff des Anspruchs 1 beschriebenen Gattung. Winkelpositionen von drehbaren Körpern werden z.B. mit Inkrementalgebern festgestellt, die optisch oder magnetisch erfaßbare Markierungen mit gleichmäßiger Teilung aufweisen.The invention relates to a device in the preamble of Claim 1 described genus. Angular positions of rotatable bodies e.g. with incremental encoders that optically or have magnetically detectable markings with uniform division.
Bei Bahnbetrachtungsgeräten (z.B. nach Spiegelstroboskop-Prinzip) benötigt man zur Erfassung der aktuellen Spiegelposition möglichst genaue Inkrementalgeber.Required for path viewing devices (e.g. mirror stroboscopic principle) one as accurate as possible to record the current mirror position Incremental encoder.
Diese Geber sollten keinerlei Zentrierfehler optischen, mechanischen oder elektrischen Ursprungs aufweisen, da hierdurch Meßfehler entstehen. Der artige Geber sind jedoch nur mit großem Aufwand bzw. praktisch nicht herstellbar.These encoders should not have any optical, mechanical or centering errors have electrical origin, since this leads to measurement errors. The like donors are, however, only with great effort or practically not producible.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vor richtung der im Oberbegriff des Anspruchs 1 angegebenen Gattung derart weiterzuentwickeln, daß die praktisch immer vorhandenen Zentrierfehler sich auf die Messung nicht auswirken können.The invention is based, a method and a task direction of the type specified in the preamble of claim 1 to further develop the practically always existing centering errors cannot affect the measurement.
Die Aufgabe für das Verfahren wird erfindungsgemäß durch die im Anspruch 1 beschriebenen Maßnahmen gelöst. Der Vorteil des Verfahrens gemäß Anspruch 1 besteht darin, die Winkelposition auch bei exzentrisch umlaufenden Gebern genau bestimmen zu können.According to the invention, the object for the method is achieved by the method described in claim 1 measures described solved. The advantage of the method according to claim 1 is the angular position even with eccentrically rotating To be able to precisely determine donors.
Für die Vorrichtung wird die Aufgabe erfindungsgemäß durch die im Kenn zeichen des Anspruchs 3 beschriebenen Maßnahmen gelöst.For the device, the task is inventively by the in the characteristic Sign of claim 3 measures described.
Ausgestaltungen der Erfindung sind in den Unteransprüchen beschrieben.Embodiments of the invention are described in the subclaims.
Die Erfindung wird im folgenden anhand eines in einer Zeichnung dar gestellten Ausführungsbeispiels näher beschrieben, aus dem sich weitere Einzelheiten, Merkmale und Vorteile ergeben.The invention is illustrated below with reference to a drawing described embodiment described in more detail, from which there are Details, features and advantages emerge.
Es zeigenShow it
Fig. 1 einen mit Signalauslösungselementen versehenen drehbaren Körper in Seitenansicht, Fig. 1 is provided with a signal triggering elements rotatable body in side view,
Fig. 2 ein Diagramm der Abweichungen vom Idealwert der Positionen, Fig. 2 is a diagram of the deviations from the ideal value of the positions,
Fig. 3 ein Blockschaltbild einer Anordnung zur Verarbeitung der Ausgangs signale der Beobachtungseinrichtungen. Fig. 3 is a block diagram of an arrangement for processing the output signals of the observation devices.
Ein Körper, insbesondere eine Scheibe 1, mit kreisförmigem Querschnitt enthält an der Oberfläche Markierungen, die aufgrund der Exzentrizität der Scheibe 1 um eine tatsächliche Achse 2 rotieren. Die Markierungen befinden sich auf der Oberfläche einer Stirnseite der Scheibe 1 in Form von Strich marken. Die tatsächlich erwünschte Drehachse ist in Fig. 1 mit 3 bezeichnet. Es handelt sich um die theoretische Drehachse 3. Bei der Drehung um die theoretische Drehachse überdecken die Markierungen den Meßbereich der verwendeten Beobachtungseinrichtungen.A body, in particular a disk 1 , with a circular cross section contains markings on the surface which rotate due to the eccentricity of the disk 1 about an actual axis 2 . The marks are on the surface of an end face of the disc 1 in the form of line marks. The actually desired axis of rotation is designated by 3 in FIG. 1. It is the theoretical axis of rotation 3 . When rotating around the theoretical axis of rotation, the markings cover the measuring range of the observation devices used.
Längs einer gemeinsamen Linie 5 sind zwei Beobachtungseinrichtungen 6, 7 angeordnet, mit denen die Markierungen erfaßt werden. Die Linie 5 verläuft durch die theoretische Drehachse 3. Bei der Drehung um die tatsächliche Drehachse 2 verändern sich die Stellungen der Markierungen in bezug auf die Beobachtungseinrichtungen 6, 7, die jeweils einen Meßbereich 9 haben, den die Ränder nicht überschreiten dürfen.Two observation devices 6 , 7 with which the markings are detected are arranged along a common line 5 . Line 5 runs through the theoretical axis of rotation 3 . When rotating about the actual axis of rotation 2 , the positions of the markings change with respect to the observation devices 6 , 7 , each of which has a measuring range 9 which the edges must not exceed.
Beim Vorbeilaufen der Markierungen 8 an den Beobachtungseinrichtungen 6, 7 ergeben sich die in Fig. 2 gezeigten Änderungen von den idealen Positionen. Infolge der Exzentrizität der Scheibe 1 weichen die Meßwerte 10, 11 von den jeweils für gleich ausgebildete Markierungen 8 zu erwartenden konstanten Wert ab. Die Ränder der Markierungen werden nämlich nicht gleichzeitig von den Beobachtungseinrichtungen erfaßt, so daß sich die Abweichungen vom Idealwert ergeben.When the markings 8 pass the observation devices 6 , 7 , the changes from the ideal positions shown in FIG. 2 result. As a result of the eccentricity of the disk 1 , the measured values 10 , 11 deviate from the constant value to be expected for markings 8 of the same design. The edges of the markings are not simultaneously detected by the observation devices, so that there are deviations from the ideal value.
Aufgrund der in Fig. 1 gezeigten Anordnung der Beobachtungseinrichtungen 6, 7 haben die Meßwerte 10, 11 jeweils einen gegenläufigen Verlauf. Die Summe der Meßwerte ist konstant und in Fig. 2 mit 12 bezeichnet.Due to the arrangement of the observation devices 6 , 7 shown in FIG. 1, the measured values 10 , 11 each have an opposing course. The sum of the measured values is constant and is designated by 12 in FIG. 2.
Die Abweichung der Kurven gegenüber dem idealen Markenverlauf ist bei beiden Beobachtungseinrichtungen in jeder Position gleich groß, jedoch entgegengesetzt gerichtet. Die Höhe der dort dargestellten Amplituden ist proportional zur Abweichung vom Idealwert.The deviation of the curves from the ideal brand course is at both observation devices in each position the same size, however oppositely directed. The level of the amplitudes shown there is proportional to the deviation from the ideal value.
Die Beobachtungseinrichtungen 6, 7, vorzugsweise photoelektrische Sensoren, sind ausgangsseitig mit Eingängen eines Summierers 13 verbunden, dem ein Schwellwertdiskriminator 14 nachgeschaltet ist. An den Schwell wertdiskriminator 14, der den unterschiedlichen binären Markierungen entsprechende Signale erzeugt, ist eine Auswerteschaltung 15 ange schlossen, die aus den vom Schwellwertdiskriminator erzeugten Impulsen die Winkelposition berechnet. Es kann sich bei der Auswerteschaltung 15 um einen Mikrorechner oder Mikroprozessor handeln. Es können auch z.B. vier Beobachtungseinrichtungen vorgesehen sein, wobei jeweils zwei die in Fig. 1 gezeigte Ausrichtung längs einer gemeinsamen Linie aufweisen.The observation devices 6 , 7 , preferably photoelectric sensors, are connected on the output side to inputs of a summer 13 which is followed by a threshold discriminator 14 . An evaluation circuit 15 is connected to the threshold discriminator 14 , which generates signals corresponding to the different binary markings, which calculates the angular position from the pulses generated by the threshold discriminator. The evaluation circuit 15 can be a microcomputer or microprocessor. For example, four observation devices can also be provided, two of which each have the orientation shown in FIG. 1 along a common line.
Der ideale Lauf der Markierungen ist in Fig. 1 mit 16 bezeichnet.The ideal course of the markings is denoted by 16 in FIG. 1.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883813754 DE3813754A1 (en) | 1988-04-23 | 1988-04-23 | Device for detecting the angular position of a rotatable body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883813754 DE3813754A1 (en) | 1988-04-23 | 1988-04-23 | Device for detecting the angular position of a rotatable body |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3813754A1 true DE3813754A1 (en) | 1989-11-02 |
Family
ID=6352732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19883813754 Ceased DE3813754A1 (en) | 1988-04-23 | 1988-04-23 | Device for detecting the angular position of a rotatable body |
Country Status (1)
Country | Link |
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DE (1) | DE3813754A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4018839A1 (en) * | 1990-06-13 | 1991-12-19 | Huebner Johannes | Rotation pulse generator - adaptively combines signals of three sensor offset by 120 deg. to correct eccentricity and elliptical deviations |
DE19745823A1 (en) * | 1997-10-16 | 1999-04-29 | Sensor Instr Gmbh | Torque and rotation angle measuring device e.g. for motor vehicle |
EP0915318A2 (en) * | 1997-11-05 | 1999-05-12 | Nissan Motor Co., Ltd. | Ball spine joint slackness measuring method and measuring apparatus |
DE10020165A1 (en) * | 2000-03-29 | 2001-10-18 | Bosch Gmbh Robert | Method for determination of the rotation speed of a combustion engine, allowing a noise signal from the ignition system to be suppressed thereby increasing accuracy of engine speed determination |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4580046A (en) * | 1981-04-13 | 1986-04-01 | Tokyo Kogaku Kikai Kabushiki Kaisha | Displacement measuring device utilizing an incremental code |
-
1988
- 1988-04-23 DE DE19883813754 patent/DE3813754A1/en not_active Ceased
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4580046A (en) * | 1981-04-13 | 1986-04-01 | Tokyo Kogaku Kikai Kabushiki Kaisha | Displacement measuring device utilizing an incremental code |
Non-Patent Citations (1)
Title |
---|
Ernst , Alfons "Drehgeber als hochgenaue Weg- und Winkelmeßgeräte" in: Feinwerk- technik & Messtechnik 95 (1987) 5, S. 304-310 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4018839A1 (en) * | 1990-06-13 | 1991-12-19 | Huebner Johannes | Rotation pulse generator - adaptively combines signals of three sensor offset by 120 deg. to correct eccentricity and elliptical deviations |
DE19745823A1 (en) * | 1997-10-16 | 1999-04-29 | Sensor Instr Gmbh | Torque and rotation angle measuring device e.g. for motor vehicle |
EP0915318A2 (en) * | 1997-11-05 | 1999-05-12 | Nissan Motor Co., Ltd. | Ball spine joint slackness measuring method and measuring apparatus |
EP0915318A3 (en) * | 1997-11-05 | 2000-12-06 | Nissan Motor Co., Ltd. | Ball spine joint slackness measuring method and measuring apparatus |
DE10020165A1 (en) * | 2000-03-29 | 2001-10-18 | Bosch Gmbh Robert | Method for determination of the rotation speed of a combustion engine, allowing a noise signal from the ignition system to be suppressed thereby increasing accuracy of engine speed determination |
DE10020165B4 (en) * | 2000-03-29 | 2006-03-02 | Robert Bosch Gmbh | Method for speed detection by superposition of encoder signals |
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Legal Events
Date | Code | Title | Description |
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8110 | Request for examination paragraph 44 | ||
8131 | Rejection |