DE202006020897U1 - Position detector for the control of movable elements - Google Patents

Abstract

Position detector for the control of movable elements, in particular the drive shafts (2) of gate, roller shutter, awning and similar drives (1), as a rotary potentiometer (3) with closed ring potentiometer (4) formed when passing at predetermined angles of rotation arranged connections (6, 8) by the Potentiometerschleifkontakt (10) depending on the respective position of the drive shaft (2) and for switching off the drive (1) suitable signal generating and via an evaluation unit (11) of the electronic control (12) is designed zuleitend , characterized in that in addition to the terminals (6, 8) at 0 ° and 180 ° and terminals (15, 17) provided at 90 ° and at 270 ° and the terminals (6, 8 and 15, 17) switch (7 , 9 and 16, 18) are assigned, which are designed to enable alternately measuring the voltage across the respective opposite terminals (6, 8 and 15, 17).

Description

The The invention relates to a position indicator for the controller of movable elements, in particular the drive shafts of gate, Roller shutter, awning and similar drives, as Rotary potentiometer with closed ring-shaped potentiometer resistor formed when driving over at predetermined angles of rotation arranged connections through the Potentiometerschleifkontakt a dependent on the respective position of the drive shaft and for switching off the drive suitable signal generating and over an evaluation of the electronic control is designed zuleitend. Also disclosed is a method of controlling movable elements, in particular the drive shafts of gate and the like Drives, wherein the angle of rotation of a sliding contact of a rotary potentiometer with closed ring potentiometer resistor by applying and measuring a voltage at terminals determined on the potentiometer resistance and then in an evaluation unit and an electronic control is used.

A position indicator in the form of a rotary potentiometer with closed ring potentiometer is out of DE 195 22 622 A1 basically known. This position detector is a further development of one of the DE 38 01 245 A1 known door drive, in which the respective movement position of a door via a corresponding position-dispensing device, as a position detector during the movement between the two end positions, the actual position of the door is checked. The signal emitted by the position detector is fed to the electronic control and used for correction. As new measuring errors can occur again and again, it is necessary to keep track of the error DE 195 22 622 A1 a position indicating device has been proposed, wherein the position detector each outputs signal maxima and / or minima as virtual reference points, so that the position of the gate on the count of the maxima and minima can be determined and monitored relatively accurately. The problem is that with these potentiometric rotary encoders with a closed 360 ° potentiometer resistance and the two connections after a shutdown of the door drive and after switching the power supply back on, it is unclear whether the sliding contact is on the left or right side of the 0 ° connection , because on both sides, so for example at 45 ° and at 315 ° the same voltage value is determined. Another problem is that in the area of the voltage supply at 0 ° and at 180 °, the slope of the voltage to be measured is so flat that a reliable evaluation is not possible at all.

Of the The invention is therefore based on the object, a position detector for determining the angle of rotation of a Potentiometerschleifkontaktes to create about the exact location of the sliding contact determined and achieved always safe working position detector becomes.

The Problem is solved according to the invention characterized that in addition to the terminals at 0 ° and 180 ° also connections at 90 ° and at 270 ° provided and assigned to the terminals switch which are an alternate measurement of the voltage across the allowing each opposite ports are formed.

by virtue of the additional connections and switches can by closing and opening the corresponding one Switch a second measurement to be made with their help the angle of rotation of the axis of the absolute value encoder, d. H. the location of Potentiometerschleifkontaktes can be determined exactly. The so certain value can then be fed to the evaluation and to be exploited, the necessary correction in the processing electronic control so that a precise determination of the state or the location of the respective gate or door leaf is possible. Since the correction, if it is necessary, at the beginning of the movement of the door leaf is an exact determination of the position on the whole process between the two endpoints possible, as before, the signal peaks and signal minima are continuous determined and thereby held the respective position of the door leaf becomes.

To an expedient development of the invention is provided that the switches of the terminals at 0 ° and 180 ° and the other switches of the connections formed jointly switching at 90 ° and 270 ° are so that the recording of the measurement can be made at short notice and gives safe readings.

A Another appropriate training is the, in the in addition to the connections at 0 ° and 180, as well as 90 ° and 270 ° further connections with switches at 45 ° and 225 ° or at 135 ° and 315 ° are provided, so ultimately even intermediate values accurately determined and the fine adjustment of the electronic control to make it even better.

The evaluation unit should also be set to the improved measurement results, which takes place in accordance with the invention in that the evaluation unit uses the voltage values respectively measured when the switches are opened at the terminals to determine the rotation angle of the absolute value encoder separately and is correspondingly connected to the electronic control unit , The corresponding determined value serves first once to be further processed in the evaluation unit, so that the exact initial position of the door leaf is determined and then, if necessary and desired, the further processing electronic control is supplied. The forwarding will usually be necessary only for the initial position and not for intermediate positions, so that during the opening or closing of the gate, the corresponding measured values from the evaluation are not to be continued to the electronic control.

costly Conversions regarding the movement of the door leaf unnecessary itself if the signal is directly dependent on the respective one Position of the drive shaft of the movable element can be generated. This eliminates the need for translation between the movement of the door leaf, for example, or a drive shaft and the corresponding shaft of the position detector.

It is provided that in the measurement of the rotation angle, the voltage alternatively at the terminals at 0 ° and 180 ° and then measured at the other terminals at 90 ° and 270 ° becomes. Because of this measurement of the resulting voltage can be accurate be determined whether the Potentiometerschleifkontakt on the left or right side of the upper switch or wherever, so an exact starting position the door leaf can be set, for example, the initial position means then to further determination of the respective Revolutions also specify exactly when the door leaf reaches its end position, causing damage to the door leaf itself or other parts of the door drive safely avoided become. This prevents incorrect measurements that the slope of the voltage to be measured is always such that a reliable evaluation of the measured voltage values given is.

Further is provided that the connections at 0 ° and at 180 ° on the one hand and the other connections closed at 90 ° and 270 ° simultaneously or be opened so that each made accurate measurements can be and in very short time cycles.

After all is provided that by alternately measuring at the different terminals resulting value over the evaluation unit further processed and as an absolute angle of rotation is passed on to the processing electronics control, so as to always specify the exact starting point of the goal movement or each corrected when initiating the movement process available stands.

The Invention is characterized in particular by the fact that so far when using potentiometric rotary encoders with a closed 360 ° potentiometer resistance and opposite Connections resulting problems are effectively resolved. The four different places over the circumference of the Potentiometer resistor arranged connections allow the Applying a voltage at different points of the potentiometer resistance, so that the position of the Potentiometerschleifkontaktes determined accurately can be. This means that regardless of the particular Position of this Potentiometerschleifkontaktes now at the beginning of Lifting a door leaf or when lowering with the continuous Revolutions of the drive shaft can be kept exactly, in which position, for example, the lower edge of the door leaf located. Accordingly, it is also possible to set and specify precisely be warm, the end position is reached, so any damage can not occur, always being a reliable one Evaluation of the measured voltage is possible because of the Tension can not be measured only in the lower and upper points but also in between and thus at points of the curve, where a plus value can be tapped.

Further Details and advantages of the subject invention arise from the following description of the accompanying drawings, in which a preferred embodiment with the necessary details and items is shown.

It demonstrate:

1 a circuit diagram of the rotary potentiometer,

2 the course of the signal voltage between the individual terminals and

3 a schematic representation of a door drive.

1 shows this to a later explained drive 1 assigned rotary potentiometer 3 So a corresponding position detector. The rotary potentiometer 3 is with a closed potentiometer resistor 4 executed in ring form. At this potentiometer resistance 4 are at 0 ° and at 180 ° connections 6 and 8th provided, each with a switch 7 respectively. 9 exhibit. The Potentiometerschleifkontakt is denoted by the reference numeral 10 Mistake.

The axis 26 of the absolute value encoder 25 , ie the Potentiometerschleifkontaktes 10 is with the evaluation unit 11 and this with the electronics control 12 connected. Suggested is that by opening the switch 7 and 9 the voltage U1 ge measure and the corresponding signal of the evaluation unit 11 should be forwarded. Then the switches 7 . 9 closed and the switches 16 . 18 the additional connections 15 . 17 opened so that now the voltage U2 measured and a corresponding signal of the evaluation 11 can be forwarded. After performing this second measurement, the switches 16 . 18 closed again, with the exact rotational angle of the axis over the two measurements 26 of the absolute value encoder 25 can be determined. The value thus determined is determined by the evaluation unit 11 further processed or is as absolute rotation angle to the further processing electronic control 12 passed.

2 with the curves displayed there shows the voltage curve at the rotary potentiometer 3 when the switches 7 . 9 closed and the switches 16 . 18 are open. The graph below shows the voltage curve at the rotary potentiometer 3 when the switches 16 . 18 closed and the switches 7 . 9 are open. The course of the curves makes it clear that a suitable design of the position detector and a corresponding circuit makes it possible to always determine the required measured values in a region where the voltage is not 0 or of the order of magnitude of 0. Accurate readings can be determined in any position.

Back to 1 Going it can be stated that an even more accurate determination of measured values is possible, if in each case between the mentioned connections 6 and 8th such as 15 and 17 further connections 20 . 21 respectively. 23 . 24 arranged, which are equipped with comparable switches, so that intermediate readings are to be determined.

3 Finally, shows a simplified reproduced drive 1 with indicated drive shaft 2 for a gate closure. In the upper area is the position detector or the rotary potentiometer 3 with the ring-shaped potentiometer resistor 4 and connections 5 for the connection with the electronic control 12 arranged. The rotary potentiometer 3 is about a wave 29 with a transmission wheel 27 connected via a transmitter strap 28 to the drive shaft 2 connected. In this way is a direct transmission of the movement of the drive shaft 2 on the rotary potentiometer 3 possible.

All mentioned features, including the drawings to be taken alone, are considered alone and in combination as essential to the invention.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 19522622 A1 [0002, 0002]
• - DE 3801245 A1 [0002]

Claims (5)

Position detector for the control of movable elements, in particular the drive shafts ( 2 ) of door, roller shutter, awning and similar drives ( 1 ), as a rotary potentiometer ( 3 ) with closed ring-shaped potentiometer resistor ( 4 ) formed when passing over at predetermined rotational angle points arranged terminals ( 6 . 8th ) through the potentiometer contact ( 10 ) one of the respective position of the drive shaft ( 2 ) dependent and for switching off the drive ( 1 ) generating a suitable signal and via an evaluation unit ( 11 ) of the electronic control ( 12 ), characterized in that in addition to the terminals ( 6 . 8th ) at 0 ° and 180 ° also connections ( 15 . 17 ) at 90 ° and at 270 ° and the connections ( 6 . 8th and 15 . 17 ) Switch ( 7 . 9 and 16 . 18 ), which alternately measure the voltage across the respective opposite terminals ( 6 . 8th and 15 . 17 ) are designed to enable. Position detector according to claim 1, characterized in that the switches ( 7 . 9 ) of the connections ( 6 . 8th ) at 0 ° and 180 ° and the other switches ( 16 . 18 ) of the connections ( 15 . 17 ) are formed in common switching at 90 ° and 270 °. Position detector according to claim 1, characterized in that in addition to the terminals ( 6 . 8th ; 15 . 17 ) further connections ( 20 . 21 and 23 . 24 ) are provided with switches at 45 ° and 225 ° or at 135 ° and 315 °. Position detector according to one of the preceding claims, characterized in that the evaluation unit ( 11 ) when opening the switch ( 7 . 9 ; 16 . 18 ) at the connections ( 6 . 8th ; 15 . 17 ) each measured voltage values for determining the rotational angle of the axis ( 26 ) of the absolute encoder ( 25 ) exploited separated and according to the electronic control ( 12 ) connected is. Position detector according to one of the preceding claims, characterized in that the signal is directly dependent on the respective position of the drive shaft ( 2 ) of the movable element can be generated.