JP6828148B2 - How to determine the absolute position, electric motors, and operating devices for friction clutches - Google Patents

Description

The present invention relates to a method of identifying an absolute position by a magnetic sensor device having a GMR sensor and a magnetic field generating magnet (Gebermagnet) that can move relative to each other. Further, the present invention is an electric motor, which includes a stator, a rotor, a magnetic sensor device having a GMR sensor and a magnetic field generating magnet, and the GMR sensor is coupled to the stator. Regarding electric motors that are coupled to rotors. Furthermore, the present invention relates to an operating device for a friction clutch.

From German Patent Application No. 102016211802.1, it comprises a magnetic element and is spirally arranged along or around the axis of rotation to provide four signal states for one rotation of the magnetic element. A method of determining the number of rotations of a component that rotates about a rotation axis by at least one multi-turn sensor that has an electrical conductor and operates according to the GMR principle is known. In order to detect the rotation speed, the resistance of the conductor is detected through the rotation angle, and the rotation speed is obtained based on the signal state. The two signal states are indistinguishable via the rotation angle, and one distinguishable switching state is detected between the two indistinguishable states. Based on two multi-turn sensors that rotate around the axis of rotation by a rotation angle that is not equal to zero, the assignment of the angular positions of the rotating components of one multi-turn sensor in an indistinguishable signal state is the other. Identified by the detection of distinguishable signal states on the multi-turn sensor.

From German Patent Application No. 102016212173.1, the magnetic element is provided and is arranged in a spiral along or around the axis of rotation so that two distinctions can be made with respect to one rotation of the magnetic element. There is known a method of determining the number of rotations and the angular position of a component that rotates about a rotation axis by at least one multi-turn sensor that operates according to the GMR principle and has an electrical conductor with a half-bridge signal. In order to detect the rotation speed, the resistance of the conductor is detected via the rotation angle, and the rotation speed is obtained based on the half-bridge signal. The magnetic sensor working according to the AMR principle determines the angular position of each component within the two semicircles, and the multi-turn sensor determines where in the semicircle the angular position is determined.

An object of the present invention is to improve the method described at the beginning. Further, an object of the present invention is to improve the electric motor described at the beginning. Furthermore, an object of the present invention is to improve the operating device described at the beginning.

This problem is solved by a method having the characteristics of claim 1.

The method according to the invention can be used to identify an absolute angle. The GMR sensor and the magnetic field generating magnet may be rotatable relative to each other. The GMR sensor and the magnetic field generating magnet can first rotate relative to each other in the first rotation direction, and then relative to each other in the second rotation direction opposite to the first rotation direction. Can be rotated. The GMR sensor can be used to count the number of revolutions. The GMR sensor is sometimes called a multi-turn sensor.

The method according to the present invention can be used to specify the absolute stroke amount. The GMR sensor and the magnetic field generating magnet may be movable relative to each other along the stroke axis. The GMR sensor and the magnetic field generating magnet can first rotate relative to each other along the stroke axis in the first direction of motion, and then along the stroke axis in the direction opposite to the first direction of motion. It can be rotated relative to each other in two directions of motion. The stroke axis may be linear.

The GMR sensor is a sensor based on the giant magnetoresistive effect. The GMR sensor can have a spiral. This helix can have multiple helice arms. The spirals can be arranged in a diamond shape. The GMR sensor can have a GMR laminate. The GMR sensor can have a reference layer and a sensor layer. The magnetization state of this sensor layer may be variable. The GMR sensor can have a domain wall generator. This domain wall generator can be placed at the end of the helix. The domain wall generator may be capable of generating a 180 ° region. This region may be injectable into the helix and / or disappear again. The magnetization state of the spiral arm may be variable under the influence of the motion of the magnetic field. The magnetized state of the spiral arm may be variable by moving the magnetic field and the spiral relative to each other. The number of revolutions may be magnetically memorable. Motion may be detectable without voltage supply. The motion may be memorable without voltage supply. The electrical resistance of the helix can be related to the state of magnetization.

When the magnetic field generating magnet and the GMR sensor rotate relative to each other, a rotating magnetic field can be applied to the GMR sensor. The GMR sensor can have four signal states per revolution. GMR sensors may have hysteresis. Due to this hysteresis, the signal state of the GMR sensor becomes partially indistinguishable.

The GMR sensor and the magnetic field generating magnet can be moved relative to each other by a predetermined stroke amount / angle in consideration of the motion resolution of the GMR sensor, particularly the angular resolution. The GMR sensor can have an angular resolution of 90 °. The GMR sensor and the magnetic field generating magnet can be rotated relative to each other by ± about 45 ° starting from a rotation position that cannot be initially assigned.

The GMR sensor can be connected to a half-bridge circuit. Each of the three distinguishable signal levels may be output. High level, Middle level and Low level may be output respectively. The signal states of the GMR sensor may be distinguishable by a combination of different half-bridge signal states.

Further, the problem of the present invention is solved by an electric motor having the feature of claim 5.

The electric motor may be controllable by an electrical control device. This electrical control device may be a control device. The electrical control device may be a local control device. The electrical control device can have an arithmetic unit. The electrical control device can have a storage device. The electrical control device can have at least one electrical signal input. The electrical control device can have at least one electrical signal output section. The electrical control device can be structurally and / or functionally signal guided to at least one other electrical control device. A bus system, such as a CAN bus, can be used for this signal guidance connection.

The electric motor can have a housing. The stator can be fixedly placed in the housing. The rotor can be rotatably supported in the housing. The magnetic field generating magnet can be attached to the rotor side. The GMR sensor can be mounted on the stator side. The magnetic field generating magnet and the GMR sensor can define a measurement gap in order to count the number of rotations in a non-contact manner and specify the absolute angle.

The electric motor can be used as an operation drive device. The electric motor can be used for use in automobiles. Electric motors should be used to operate automated transmissions, electronic accelerator pedals, valve regulators, window regulators, seat regulators, sliding roof regulators, mirror regulators and / or air flap regulators. Can be done.

Further, the problem of the present invention is solved by an operating device having the feature of claim 6.

The operating device may be a hydrostatic operating device. The operating device can have at least one master cylinder, at least one slave cylinder, and at least one hydraulic section formed between at least one master cylinder and at least one slave cylinder. .. At least one electric motor can be used to power at least one master cylinder. At least one slave cylinder can be assigned to the friction clutch.

The friction clutch may be a single clutch or a dual clutch. The friction clutch can be used for placement in the power train of an automobile. This power train can have a prime mover. This prime mover may be an internal combustion engine. The power train can have a friction clutch. The power train can have a transmission. This transmission may be a manual transmission. The power train can have at least one driveable vehicle wheel. The friction clutch can be used to be placed between the prime mover and the transmission.

In summary, or in other words, in the end, it becomes clear that the present invention, in particular, the number of revolutions is determined by GMR multi-turn without angle information. The output (half-bridge signal) of the magnetoresistive multi-turn sensor has three statuses (High, Middle, Low). Depending on the position of the magnet, four possible "combinations" during one revolution can be identified, but the unique hysteresis of the sensor makes the status non-unique. If the system allows this, it deviates from the hysteresis region, which causes the magnet to rotate slightly, eg ± 45 °, or be equipped with a magnet to determine the exact number of revolutions (eg 1/4 revolution). Move the piston somewhat.

INDUSTRIAL APPLICABILITY According to the present invention, the absolute angle can be specified in addition to the count of the number of rotations. The additional angle sensor can be omitted. Assembling time is reduced. Measurement accuracy is improved.

Hereinafter, a plurality of embodiments of the present invention will be described in detail with reference to the drawings. From this description, further features and advantages become apparent. The specific features of these examples can form the general features of the present invention. The features associated with other features of these examples can also form the individual features of the present invention.

It is a diagram which has the signal course of the GMR sensor in the half bridge while the magnetic field is rotating. It is an excerpt enlarged view of the signal passage of the GMR sensor in the half bridge while the magnetic field is rotating. FIG. 5 is a diagram having a signal course of a GMR sensor in a half bridge when the magnetic field rotates clockwise and counterclockwise, and a corresponding signal pattern with hysteresis.

FIG. 1 shows a diagram 100 having signal passages 102, 104 of the GMR sensor in the half bridge while the magnetic field is rotating. In this diagram, x ₁ axis, Yes and rotation angle plotted on x ₂ axis and x ₃ axes, voltage on the y-axis are plotted. The signals 102 and 104 can have three different signal levels, High, Middle, and Low, respectively. During one revolution corresponding to 360 °, four basically distinguishable signal level combinations 106, 108, 110, 112 of the signals 102, 104 occur. The signal level combination 106 is signal 102 High / signal 104 High. The signal level combination 108 is signal 102 Middle / signal 104 High. The signal level combination 110 is signal 102Low / signal 104High. The signal level combination 112 is signal 102Middle / signal 104Middle.

FIG. 2 shows an enlarged enlarged view 200 of an excerpt of the signal passages 202 and 204 such as the signal passages 102 and 104 shown in FIG. 1 of the GMR sensor in the half bridge while the magnetic field is rotating. It can be seen in detail that the signal level combination 208 of signal 202Middle / signal 204High also exists for a short time at the start of signal level combination 212 of signal 202Middle / signal 204Middle due to hysteresis. As a result, the rotation position cannot be assigned first. Nevertheless, in order to assign a rotation position, the magnetic field is rotated in the opposite direction by about 45 ° until it deviates from the hysteresis region 214 and the rotation position can be assigned.

FIG. 3 shows a diagram 300 having a signal course 302 of the GMR sensor in the half bridge when the magnetic field rotates clockwise and counterclockwise, and a corresponding signal pattern with hysteresis. It is shown.

In this diagram, the angles of rotation over 1.5 rotations corresponding to 540 ° are plotted on the x-axis x ₁ , x ₂ , and x ₃ , and the voltage is plotted on the y-axis. The x ₁ axis, sinusoidal signal curve 302 resulting from the signal pattern of the GMR sensor is shown. The x ₂ axis, the signal pattern of the first half-bridge are plotted. The signal level of the first half bridge can have a low level 304, a middle level 306, and a high level 308. The x ₃ axis, the signal pattern of the second half bridge are plotted. The signal level of the second half bridge can have a low level 310, a middle level 312, and a high level 314.

When the magnetic field rotates clockwise, the signal pattern of the GMR sensor with the first signal level 316 occurs. When the magnetic field rotates counterclockwise, a signal pattern of a GMR sensor with a second signal level 318 occurs. When the direction of rotation changes, a hysteresis region 320 is generated.

100 diagram 102 signal, signal progress 104 signal, signal progress 106 signal level combination 108 signal level combination 110 signal level combination 112 signal level combination 200 excerpt enlarged view 202 signal, signal progress 204 signal, signal progress 208 signal level combination 212 signal level Combination 214 Hysteresis region 300 Diagram 302 Signal progress 304 Low level 306 Middle level 308 High level 310 Low level 312 Middle level 314 High level 316 First signal level 318 Second signal level 320 Hysteresis region

Claims (5)

In a method of identifying an absolute position by a magnetic sensor device having a GMR sensor and a magnetic field generating magnet that can move relative to each other.
The GMR sensor and the magnetic field generating magnet are first moved relative to each other in the first moving direction, and then relatively moved relative to each other in a second moving direction opposite to the first moving direction. This is a method of assigning a position that cannot be assigned first due to hysteresis .
A method, wherein the GMR sensor is connected to a half-bridge circuit and is capable of outputting three distinct signal levels (304, 306, 308, 310, 312, 314), respectively . The method according to claim 1, wherein the GMR sensor and the magnetic field generating magnet are moved relative to each other by a predetermined stroke amount / angle in consideration of the motion resolution of the GMR sensor. The GMR sensor has an angular resolution of 90 °, and the GMR sensor and the magnetic field generating magnet are rotated relative to each other by ± about 45 ° starting from an angular position that cannot be initially assigned. The method according to claim 1 or 2 , wherein the method is characterized. It is an electric motor and includes a stator, a rotor, and a magnetic sensor device having a GMR sensor and a magnetic field generating magnet. The GMR sensor is coupled to the stator, and the magnetic field generating magnet is attached to the rotor. In the combined electric motor
An electric motor, characterized in that the absolute angular position of the rotor can be specified by the method according to at least one of claims 1 to 3 . An operating device for a friction clutch, which comprises at least one electric motor according to claim 4 .

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