KR19980087163A - Method for operating absolute position detector - Google Patents

Abstract

The present invention relates to a method for operating an absolute position detector consisting of two or more components 28, 30 which are movable towards each other. The first component 28 of the absolute position detector 26 has two or more segments 28a, 28b magnetized in different directions, and the second component 30, 11 has one or more magnetic field sensors 32, 34. In this case, the magnetic field sensors 32 and 34 grasp the magnetic field of the first component 28 and convert it into a signal having two levels in the designated direction according to the sign of the components of the magnetic field. The level is transmitted to the signal processing apparatus 20 and evaluated by the signal processing apparatus 20 to detect the relative position of the first component 28 with respect to the second components 30, 11. According to the method according to the invention, the magnetic field sensors 32, 34 are stopped before the operation of the one or more magnetic field sensors 32, 34 stops while the first component 28 stops relative to the second component 30, 11. The level generated from is stored and when the operation of the magnetic field sensors 32 and 34 is resumed, the level is newly identified and compared with the stored level. In this case, if the measured level does not match the stored level, it is evaluated as a valid level change.

Description

Method for operating absolute position detector

From DE-OS 42 32 950 a device for the positioning of moving parts is provided which is equipped with an electromotive driving device controlled by a signal processing device. The drive is arranged with an incremental position detector to detect the actual position of the moving part. The incremental position detector consists of a magnet wheel placed on the rotor shaft of the motor, which has magnetic sensors arranged to hold several segments and frames magnetized in different directions. . Magnetic field sensors, which act as signal detectors, convert the magnetization in the south or north direction prevailing at each position of the magnetic field sensor into a signal with two different levels. The magnet wheel moves relative to the magnetic field sensor by the size of the segment between two level variations that occur in one of the magnetic field sensors. By counting different successive levels and increasing or decreasing the counter according to the direction of rotation of the rotor shaft of the motor, the relative actual position of the movable part relative to the calibration position is determined.

When the rotor shaft of the motor is stopped, for example, energy saving, etc., the power supply of the magnetic field sensor is cut off, a counting error may occur. As a result, an error occurs in the process of incremental detection of the actual position of the movable part, which necessitates the need to recalibrate the position detection.

On the other hand, the method according to claim 1 has an advantage that the change of the level can be accurately detected even when the operation of the magnetic field sensor is stopped due to the power supply of the magnetic field sensor being cut off. Due to switching hysteresis, which occurs when there are many magnetic sensors, if the component of the magnetomotive force is very small in the direction detected by the magnetic field sensor after the sign is reversed, the generated level does not coincide with the actual sign of the component. The inverted sign, i.e., the sign that had the component weight before the sign inversion, until the threshold is exceeded.

This sign inversion occurs when the transition region (which defines the hysteresis region) of the segments of the first part magnetized in different directions passes through the side of the magnetic field sensor. If the relative movement of the first part relative to the second part stops in the hysteresis region, and the magnetic field sensor stops operating, in some cases an incorrect level may be generated before stopping the operation. When the magnetic field sensor is activated again, the hysteresis effect disappears and the level is generated correctly according to the actual sign of the magnetic field component. Due to this effect, the magnetized segment of the first component is not considered in the detection process by the magnetic field sensor, and an error occurs in the values derived as a result of the detection. Such a switching hysteresis can be detected when the magnetic field sensor is deactivated by the method according to the invention. It is also possible to determine whether the level variation is valid, that is, whether the level variation is caused by a change in the magnetic field as the first component moves relative to the second component, so that an appropriate response is made when evaluating the level. Can be lost.

The claims dependent on claim 1 are advantageously developed forms of the invention.

If a valid level change is identified when one or more magnetic field sensors have stopped operating, it is advantageous because the relative position of the first part, designated by the signal processing device, relative to the second part is corrected according to the level change. In particular, in the case of incremental detection of segments, that is, incremental detection relative to the previous detection, if the power supply of the magnetic field sensor is frequently cut off, the detection errors caused by the magnetic field sensor stopping operation are one of the By adding up in the hysteresis region, a huge error may occur so that it is not allowed to detect the position. Here, the proposed calibration reduces the additional cost of fixed installation of the absolute position detector.

By identifying the level change, if the counter is increased or decreased depending on the relative movement direction of the first part with respect to the second part, that is, by increasing or decreasing by 1, the level of the magnetic field sensor for position detection is very high. It can be evaluated simply. In this case, the counter shows the relative position with respect to the starting position of the moved part, and the counter can be evaluated for the incremental position detection. The level variation may be counted by one or several simple digital counters installed in the signal processing device or by program control.

The use of two magnetic field sensors for detecting the magnetic field of the first component has the advantage that position detection has redundancy. In addition, in the case of the specific geometrical configuration of the segment and the magnetic field sensors, the direction of movement of the two components toward each other can be designated by evaluating the phase shift of the levels of the two magnetic field sensors.

The use of two magnetic sensors also makes it easier to detect errors, depending on the situation, when detecting the relative positions of two components. If the spacing between the boundaries of the magnetized segments does not coincide with the spacing between the two magnetic sensors, and if level fluctuations occur in the two magnetic sensors while the operation is stopped, the constant position of the two parts with respect to each other is considered invalid. That is, under the above prerequisites, such a situation may occur only when the movable part is adjusted through an external operation or an error occurs in the evaluation logic. Since the magnetic field sensors are inactive, it is no longer certain whether the incremental detected position represents the actual position of the two moving parts relative to each other. In such cases, incremental position detection can be recalibrated. Conversely, if the level fluctuates in exactly one of the two magnetic field sensors, it is advantageous because the position calibration is made according to the assumed effective level fluctuations. In this case, it is likely to start with the switching hysteresis of the magnetic field sensor whose level has changed.

This method is mainly used when the absolute position detector is arranged in a drive by an electric motor, especially when it is arranged to adjust moving parts of a vehicle such as a window, a sliding sunroof, a tilting sunroof. The first part of the absolute position detector is a magnet wheel, which is fixed not to twist on the rotor shaft of the motor, and the second part is fixed to the case of the electric drive in the form of an electronic board having a magnetic field sensor. The absolute position detector detects a rotation relative to the motor stator of the magnet wheel and the motor rotor shaft. A method of arranging the first part as a magnet wheel so as not to move in the case of the driving device and allowing the magnetic field sensor to rotate together with the rotor shaft of the electric motor can also be considered. In particular, when the power supply to the generator is cut off, it is necessary to stop the operation of the magnetic field sensors having a large power consumption to protect the battery of the vehicle. In this case the method according to the invention makes it possible for the absolute position detector to work correctly.

It is very advantageous to operate the absolute position detector according to the method according to the invention when detecting the position of the movable part moved by the drive from the rotation of the motor rotor shaft relative to the motor stator. Whereas conventional microswitches have been installed in the limit stop of moving parts to recalibrate the position, or other means have been used to detect the absolute position, operating the absolute position detector in accordance with the present invention can lead to errors. The number of coefficients generated can be greatly reduced. The result is fewer procedural steps for recalibration, and can be recalibrated in a simpler way that can be implemented at lower cost instead of recalibration with a microswitch. For example, a method of recalibration may be considered by moving and grasping the motor current toward the limit stop. In some situations, the recalibration itself may be omitted entirely. However, even if the microswitch must continue to be used, its life is extended by reducing the wear of the microswitch. In addition, the time required for recalibration is greatly reduced, which simplifies operation.

The method according to the invention even if the level is evaluated to determine the speed and / or acceleration of the first part and the second part and / or the direction of movement of relative movement with respect to each other and / or the force transmitted by the moved part. It is advantageous to use. Accurately grasp the position change of the absolute position detector, and since these values depend on the position change of the parts relative to each other, the error is reduced when detecting the position change.

Advancing the method according to the invention makes it possible to position the parts very precisely in a position designated by the hysteresis region between the magnetized segments of the first part. This accurate positioning allows the components to be repeatedly moved toward each other by less than the size of the hysteresis region, the operation of one or more magnetic sensors is stopped, and after a specified time the level of the stored magnetic sensors is Operation is resumed after operation resumes until it no longer matches the generated level. In this case, the magnetic field sensor detects one hysteresis region of the first component. If there are n segments magnetized in different directions on a rotating magnet wheel, there will be n hysteresis regions, resulting in high values far exceeding the absolute resolution of absolute position detectors up to n * m positions when m magnetic field sensors are used. Can be adjusted with accuracy While the resolution is generally not higher than the size of the magnetized segment, it is generally equal to the size of a much smaller hysteresis region.

The parts can be moved towards each other by an interval less than the size of the magnetized segments, for example by using a very short operating pulse of the device driving the parts.

Another development of the present invention is that, when interrupting the operation of the magnetic field sensor by shutting off the power supply of one or more magnetic field sensors, a level variation may occur due to the sign inversion actually occurring at the position of the sensor depending on the state of the sensor output. It is based on the recognition by the present invention. This level fluctuation is rather due to power interruptions and to vibrations generated by the capacitive and inductive resistors of the electronic drive or absolute position detector itself. This effect appears especially when a magnetic field sensor such as a Hall sensor has a so-called open collector output. Therefore, according to the present invention, when the first part stops with respect to the second part, the levels transmitted from the magnetic field sensor to the signal processing device while the operation of the magnetic field sensor is stopped are invalidated, and are not considered in incremental position detection or the like. do. As a result, only the level variation due to the movement of the magnet wheel is counted.

In an advantageous form of the method according to the invention, the signal processing device is operated in a program controlled manner. When the level fluctuates, it is usually executed by the microcontroller of the signal processing device, the normal operating mode which may include various functions in addition to the position detection is interrupted, and the interrupt subprogram is executed (interrupted), where the level is The variation is evaluated. After the level change is evaluated, the normal operating mode resumes. Effective level variations can be evaluated by separating the level variation from the normal operating mode and evaluating it in the interrupt subprogram. And valid level variations are not lost while processing complex program parts. Moreover, the method according to the invention is easily implemented in an interrupt subprogram.

In the other very simple form of this method, the identification character is set before the magnetic field sensor stops operating, so that after the operation is resumed, the identification character is reset, and if the identification character is set, the level variation is not evaluated. can do. In this case, the interrupt subprogram monitors whether an identifier is set and evaluates the level change as valid or invalid depending on whether it is set. If the level variation is evaluated as invalid, the level variation is not taken into account in incremental position detection.

Other advantageous forms of the method according to the invention refer to the subclaims and the following examples.

1 is a block diagram of an apparatus operating according to the method according to the invention.

2a is a flow chart of a method according to the invention.

2b is a flow chart of a method according to the invention.

3 is a flow chart in the form of an evolution of the method according to the invention according to FIGS. 2A and 2B;

4a is a flow diagram of a second form of development of the method according to the invention;

4b is a flow diagram of a second form of development of the method according to the invention;

4c is a flow diagram of a second form of development of the method according to the invention;

The method according to the invention is implemented in the apparatus shown in FIG. 1. The electric drive apparatus 10 equipped with the electric motor 12 drives the movable component 16 via the gear 14. Here, the movable part refers to, for example, a sliding sunroof of a vehicle, a tilting sunroof or a window, a seat adjuster, a mirror adjuster, a ventilation valve such as an air conditioner, and the like. The electric motor 12 has a rotor shaft 13 that rotates relative to the stator 11 of the electric motor 12. The signal processing apparatus 20 controls and / or adjusts the electric motor 12 via the drive circuit 18 according to the adjustment instruction specified by the operation indictment 22. The drive circuit 18 affects the speed of the electric motor 12 by supplying energy to the electric motor 12, changing the clock pulse, or the like, and transmitted from the signal processing device 20. The direction of rotation is influenced by the control signal 24.

The electric motor 12 has an absolute position detector 26, which is drawn in detail in the drawings and the first part 28 arranged to be non-twistable on the rotor shaft 13 of the electric motor 12. It consists of the 2nd component 30 of an electronic board form similarly to the stator 11 in the unsupported motor frame.

The first component 28 is made in the form of a magnet wheel having two segments 28a and 28b magnetized in different directions. The hysteresis region 29 is located in the transition region between the magnetized segments 28a and 28b. On the electronic board 30 serving as the second component, two Hall sensors 32 and 34 serving as magnetic field sensors are disposed at an angle of 90 ° in the circumferential direction of the magnet wheel 28. Hall sensors 32 and 34 generate sensor signals 36 and 38 having a level in the direction specified by the normal of the sensor surface of Hall sensors 32 and 34 in accordance with the sign of the component of the magnetic field. When one of the two hysteresis regions 29 passes by the side of the hall sensors 32, 34, the sign of the component of the magnetic field in the normal direction of the surface is reversed. Sensor signals 36 and 38 are transmitted via an input interface 39 of the signal processing device 20. Energy is supplied from the sensor drive circuit 42 to the two Hall sensors 32 and 34 via the conductive wires 44 and 46. The signal processing apparatus 20 can stop or resume the operation of the hall sensors 32 and 34 by adjusting the sensor drive circuit 42 by the operation signal 48 and cutting off the energy supply.

The apparatus seen in FIG. 1 operates according to the method for operating the absolute position detector 26, which is drawn in flow charts in FIGS. 2A and 2B. FIG. 2A illustrates a process in which the absolute position detector 26 is operated to detect a position relative to the stator 11 of the magnet wheel 28 by detecting the position relative to the electronic board 30 of the magnet wheel 28. Shows. The levels of the sensor signals 36, 38 are read out from the signal processing device via the input interface 39 in step 51 of this process. In step 53 it is monitored by input interface 39 whether one of the two levels has changed. When the magnet wheel 28 moves relative to the hall sensors 32 and 34, and the signs of the components of the magnetic field grasped by the hall sensor are reversed, one of the levels changes. The input interface 39 then places the H level at the interrupt request (IRQ) input of the microcontroller 21, thereby stopping the normal operating mode of the microcontroller 21 of the signal processing apparatus 20 in step 55. (Interrupt). The microcontroller 21 executes an interrupt subprogram in step 56 where the counter assigned to the hall sensor 32 or 34 is increased by the signal processing device 20 in accordance with the rotation direction of the electric motor 12. Or reduced. After the evaluation routine is completed, the microcontroller 21 of the signal processing device 20 resumes the normal operation mode at the position where it was previously interrupted by the interrupt request signal. The process jumps back to step 51.

Counters assigned to the hall sensors 32 and 34 are implemented in the form of variables in the storage device 47 of the signal processing device 20. The count of the counter is normalized to the calibration position of the magnet wheel 28 that coincides with the limit stop of the movable part 16. As a result, the coefficients of the counter are located in the position of the magnet wheel 28 with respect to the hall sensors 32, 34 with the frame fixed to the electric drive and the rotor shaft 13 with respect to the stator 11 of the electric motor 12. Will indicate the position of. The rotation of the motor rotor shaft 13 is thus detected by the absolute position detector 26. In addition, the position of the movable component 16 is detected by evaluating the counter.

In some cases, when the motor rotor shaft 13 is stopped according to the method illustrated in FIG. 2B in order to minimize the power consumption of the driving device 10, the operation of the hall sensor is stopped after the waiting time has elapsed. In step 57, the levels generated from the two Hall sensors 32, 34 are read-in via the input interface 39 and stored in the storage 47 of the signal processing apparatus 20. In step 59, the sensor drive circuit 42 is guided from the signal processing device 20 via the operation signal 48 to shut off the power supply of the hall sensors 32, 34.

For example, if a wake up condition is met, such as when the electric motor has to be turned on again, at step 60 the power supply of the Hall sensors 32, 34 is reconnected. In step 61, the levels generated from the hall sensors 32 and 34 after the operation resumes are again grasped by the signal processing apparatus 20 and read in. In step 62 the then stored levels and the newly identified levels of the two Hall sensors 32, 34 are compared with each other. If the level identified by the hall sensor 32 and the hall sensor 34 and the stored level do not match, the process jumps to step 67. Since the segments 28a and 28b are each 180 degrees in size, the Hall sensors 32 and 34 are arranged at an angle of 90 degrees in the circumferential direction, such a case appears only when a failure occurs. This is because two Hall sensors 32 and 34 may not be located in one hysteresis region 29 of the magnet wheel 28 at the same time. For example, a failure may occur if mechanical adjustment is made while the hall sensors 32 and 34 are stopped. However, it is also possible to think about the effect of failure in level evaluation. If a fault occurs during level evaluation, the position detection should be denormalized, regardless of the cause. Thus, in step 67 the position detection of the movable component 16 is corrected by moving the movable component 16 to a micro switch not drawn in detail in the drawing. The microswitch is activated when the moving part is in the calibration position, and when the microswitch is activated, the coefficients of the two counters are set to the specified calibration values. When the calibration is complete, the signal processing device starts to operate normally in step 68.

If it is found in the inquiry 62 that the level variation has not occurred in the two Hall sensors 32 and 34, then in step 63 it is queried whether the level generated from the Hall sensor 32 has changed. If the level has changed, this level change is evaluated as a valid level change in step 66, and the counter assigned to the hall sensors 32, 34 increases or decreases before the hall sensor stops operating, depending on the direction of rotation of the motor, The constant relative position of the magnet wheel 28 relative to the hall sensors 32, 34 is corrected. In this case, the level variation is most likely caused by the Hall sensor 32 facing the hysteresis region 29 between the two magnetized segments 28a, 28b of the magnet wheel 28. Even in this case, if the position calibration is completed in step 66, the process jumps to step 68.

If the levels of the hall sensor 32 coincide in step 63, the levels of the hall sensor 34 are compared with each other in step 64. If they do not match, in step 65 the coefficients of the counter assigned to the hall sensor 34 are calibrated. Then jump to step 68. After the operation is resumed, if the stored level of the hall sensor 34 and the identified level coincide, the inquiry query 64 also jumps to step 68.

As described above, the counter of the absolute position detector 26 is evaluated by the signal processing device 20 to detect the position of the movable component 16. In order to detect the speed and acceleration of the rotating part, the direction of rotation, and the torque transmitted by the rotating part, the level of the Hall sensors 32 and 34 and / or the coefficient of the counter assigned to the Hall sensors 32 and 34 are also evaluated. For example, certain values of these factors may be used to implement the process of detecting engagement of an object or part by the movable part 16.

In addition to using in the normal operating mode, the method according to the invention can also be used to move moving parts to a precisely defined position. At this time, the target positions which can be driven by installing the hall sensors 32 and 34 and through the hysteresis region 29 of the magnet wheel 28 are designated. The geometry in which the hysteresis region 29 is located near one of the Hall sensors 32, 34 can be selected as the target position. Thus, one of these target positions, hereinafter referred to as the hysteresis target positions, specifies the hysteresis region 29 of the magnet wheel 28, one of the two Hall sensors 32 or 34, and roughly near the hysteresis target position. It is defined by specifying a target coefficient for the selected Hall sensor 32 or 34 for coarse positioning.

The method depicted in FIG. 3 is executed to move to the hysteresis target position when designating one of these hysteresis target positions via the operation prosecuting 22 of the signal processing apparatus 20. When the process starts in step 70, in step 71 the signal processing apparatus grasps the target coefficient of the counter for the specified hysteresis target position assigned to the hall sensors 32, 34, and the coefficient does not match the actual coefficient. Otherwise, the motor 12 is moved in step 72.

While the motor is moving, the signal processing device 20 evaluates the levels of the hall sensors 32 and 34 to detect the position of the movable component 16 and the position of the magnet wheel 28 as mentioned above. In the next step 74, the signal processing apparatus monitors whether the actual coefficient matches the target coefficient. The target coefficient is selected such that the hysteresis region 29 to be driven does not fall within the detection range of the selected hall sensor 32 or 34. If the target coefficient and the actual coefficient do not match, the motor 12 continues to move in step 72, and if there is a match, the levels of the two Hall sensors 32, 34 are stored in step 76, then step 78 ), The operation of the hall sensors 32, 34 is stopped. The operation of the hall sensors 32, 34 is resumed at step 80 when a predefinable delay time has elapsed. The delay time is selected to have a high probability that the hysteresis effect of the hall sensors 32 and 34 is canceled. In some cases, the magnetism of the hall sensors 32 and 34 may be specified to be erased. In step 82 the levels of the Hall sensors 32, 34 are newly identified and compared with the stored levels. If the level variation occurs in the Hall sensor 32 or 34 selected for the hysteresis target position during the rest phase and the level variation does not occur in the remaining Hall sensor 34 or 32, the two magnetized segments 28a, The rotor shaft 13 of the electric motor 12 is positioned so that the boundary area between 28b) lies exactly under this hall sensor 32 or 34. If no level variation occurs, then at step 84 the signal processing device 20 drives the electric motor 12 for a very short time. This time is selected such that the motor rotor shaft 13 moves by a small distance relative to the hysteresis region 29. The process then jumps back to step 76. Thus, this process makes it possible to position the rotor shaft 13 and the movable part 16 of the electric motor 12 to a hysteresis target position whose resolution is specified by the size of the hysteresis region 29.

As can be seen in FIGS. 4A-4C, another form of development of the method according to the invention has been implemented in the device shown in FIG. 1. As described above, the level variation of the hall sensors 32 and 34 through the signal processing device 20 is evaluated by the interrupt control program mode. The level fluctuation that is effective by mistake of any missing pulses while the motor rotor shaft 13 and the magnet wheel 28 are stopped and the Hall sensors 32 and 34 stop operation by the process shown in FIG. 4A. Will not be counted. Therefore, before stopping the operation, the procedure step 100 shown in Fig. 4 is executed, and the identification character 101 is stored in the storage device 47 of the signal processing apparatus 20 by this procedure step. In step 102, the hall sensors 32, 34 are stopped by blocking the power supply of the hall sensors 32, 34 by the sensor drive circuit 42.

4B shows a cross section of an interrupt subprogram, which is executed by the microcontroller 21 when an interrupt is performed through the input interface 39 when a level change occurs. In the first step 104, after the interrupt program is started, it is queried whether the identification character 101 is set. The whole process is executed only if the identification character is not set, and if it is set, it jumps to the end 106 of the interrupt subprogram immediately. As a result, a failure occurring in the conducting wire connected to the signal processing device 20 or the vibration generated while the operation of the hall sensors 32 and 34 is stopped is not counted as a valid level change, and the wrong position of the movable part 16 is caused by the signal processing device. It is not detected through 20.

In order for the Hall sensors 32 and 34 to resume operation, the process shown in FIG. 4C is executed. In step 108 voltage is again supplied to the Hall sensors 32, 34. The identification character 101 is reset at step 110 only after a selected time has elapsed from the time of connecting the power supply so that the hall sensor is ready for operation again. Only then will the motor 12 be operated again. The next time the interrupt of the microcontroller 21 is executed, the level variation is considered to be valid again.

Claims (17)

Consisting of two or more components 28, 30 moving towards each other, the first component 28 comprising two or more segments 28a, 28b magnetized in different directions, and the second component 30 being made of The magnetic field of the first component 28 is detected, converted into a signal having two levels in a predetermined direction according to the sign of the component of the magnetic field, and then transmitted to the signal processing device 20, and the second component of the first component 28 A method for operating an absolute position detector (26) comprising one or more magnetic field sensors (32, 34) whose levels are evaluated by the signal processing device (20) to detect a relative position with respect to (30). When the first component 28 stops relative to the second component 30, 11, the level generated from the magnetic field sensors 32, 34 is stored before the one or more magnetic sensors 32, 34 stop working. When the magnetic field sensors 32 and 34 resume operation, the level is newly identified and stored. And comparison and, if it does not match the measured levels stored in the level the absolute position detector OPERATING characterized in that the level change is evaluated as a valid level change. Method according to claim 1, characterized in that a constant relative position of the first component (28) relative to the second component (30, 11) is corrected according to the assumed effective level variation. 3. The method according to claim 1 or 2, wherein a change in level is grasped and the counter is increased or decreased depending on the direction of relative movement of the first part (28) with respect to the second part (30, 11). Characterized by a method of operating an absolute position detector. 2. The magnetic field sensor according to claim 1, wherein two magnetic field sensors (32, 34) grasp the magnetic field of the first component (28), The method of operating an absolute position detector, wherein the levels of the two magnetic sensors (32, 34) are stored before the operation is stopped. 5. Method according to claim 4, characterized in that position calibration is carried out if a level change occurs in exactly one of the two magnetic field sensors (32, 34). 6. The two magnetic fields according to claim 4 or 5, wherein the spacing between the boundaries of the segments 28a, 28b underlying the two magnetic sensors 32, 34 is not equal to the spacing between the two magnetic sensors 32, 34. A method of operating an absolute position detector, characterized in that when a level change occurs in the sensor (32, 34), a constant relative position is evaluated as invalid. An absolute position according to claim 1, characterized in that the magnetic field is grasped by the Hall sensors 32, 34 as the magnetic field sensors 32, 34, and the direction is the magnetic field direction sensed by the Hall sensors 32, 34. How the detector works. 2. Method according to claim 1, characterized in that one of the two parts (28) rotates relative to the other part (30, 11). An absolute position detector (26) of claim 1, wherein an absolute position detector (26) of the electric drive device (10) is arranged for adjusting the movable parts (16) of the vehicle, in particular windows, sliding sunroofs, tilting sunroofs, and the like. The first part 28 of the motor is arranged so as not to twist on the motor rotor shaft 13 as the magnet wheel 26, and the frames of the second parts 30 and 11 of the absolute position detector 26 are driven. An absolute position detector operation, which is arranged to be fixed to the case of (10), characterized in that a relative rotation of the motor rotor shaft 13 with respect to the motor 12 stator 11 is detected by the absolute position detector 26. Way. 10. A method according to claim 9, characterized in that the position of the movable component (16) is detected from relative rotation of the motor rotor shaft (13) with respect to the motor (12) stator (11). 2. The method according to claim 1, for detecting the speed, acceleration, the direction of movement of relative movement with respect to each other or the force transmitted by the moved component (28) of the first component (28) and the second component (30, 11). A method of operating an absolute position detector, wherein the level is evaluated. The components according to claim 1, wherein the components are repeatedly moved towards each other by an interval smaller than the size of the transition region 29 in the transition region 29 of the magnetized segments 28a and 28b in different directions. The level of one or more magnetic field sensors 32, 34 generated before the operation is stopped, the level of one or more magnetic field sensors 32, 34 generated before the operation is stopped, and the level generated after the operation is resumed The method of operating an absolute position detector, wherein operation is resumed until it no longer coincides. The method of claim 1, wherein the first component 28 stops relative to the second component 30, 11 while the magnetic field sensors 32, 34 stop working. A method of operating an absolute position detector, characterized in that the level delivered to the signal processing device (20) is evaluated as invalid. 14. The signal processing apparatus 20 according to claim 13, wherein the signal processing apparatus 20 is program controlled, when the level changes, the normal operation mode of the signal processing apparatus is interrupted (interrupted), and the level change is evaluated in the interrupt subprogram through the signal processing apparatus, A method of operating an absolute position detector, wherein the normal mode of operation is resumed after the level variation is evaluated. 15. The absolute position detector operation according to claim 14, wherein the identification character is set before the operation is stopped, the identification character is reset after the operation is resumed, and the level variation is not evaluated when the identification character is set. Way. The method of claim 13, wherein the one or more magnetic field sensors 32, 34 are stopped by shutting off the power supplies 44, 46 of the magnetic field sensors 32, 34, and again by connecting the power supplies 44, 46. The operation is resumed, and the absolute position detector operating method is characterized in that the identified level variation is evaluated to be valid when a specified time has elapsed from the time when the power supply is connected. 17. The method of claim 16, wherein a time is selected and the magnetic field sensor is again ready for operation when this time elapses.