阅读说明：本技术 用于确定致动器、尤其离合器致动器的围绕旋转轴线旋转的构件的绝对位置的方法和装置 (Method and device for determining the absolute position of a component of an actuator, in particular a clutch actuator, which rotates about an axis of rotation ) 是由 马库斯·迪特里希 于 2018-05-15 设计创作，主要内容包括：本发明涉及一种用于确定致动器、尤其离合器致动器的围绕旋转轴线旋转的构件的绝对位置的方法,其中,在构件(14)上布置随同旋转的磁性元件(18),并且磁性元件(18)的绝对位置借助与磁性元件(18)相对的多圈传感器(16)确定,多圈传感器被供给电压。在可使用特别稳固且简单的多圈传感器的方法中,韦根线单元(19)监控旋转构件(14)的磁组件(18、22)的运动、并且在探测到运动时因旋转构件(14)的磁组件(18、22)的磁场而产生能量且将该能量转变为电压,电压被提供用于多圈传感器(16)的电压供给。(The invention relates to a method for determining the absolute position of a component of an actuator, in particular a clutch actuator, which rotates about an axis of rotation, wherein a magnetic element (18) which rotates along with the component (14) is arranged, and the absolute position of the magnetic element (18) is determined by means of a multiturn sensor (16) which is opposite the magnetic element (18) and is supplied with a voltage. In a method in which a particularly robust and simple multi-turn sensor can be used, a wiegand wire unit (19) monitors the movement of the magnetic assembly (18, 22) of the rotary component (14) and, upon detection of the movement, generates energy as a result of the magnetic field of the magnetic assembly (18, 22) of the rotary component (14) and converts this energy into a voltage, which is provided for the voltage supply of the multi-turn sensor (16).)

1. Method for determining the absolute position of a component of an actuator, in particular a clutch actuator, which rotates about a rotational axis, wherein a magnetic element (18) which rotates along with it is arranged on the component (14) and the absolute position of the magnetic element (18) is determined by means of a multi-turn sensor (16) which is opposite the magnetic element (18) and is supplied with a voltage, characterized in that a wiegand wire unit (19) monitors the movement of a magnet assembly (18, 22) of the rotating component (14) and, when a movement is detected, generates energy as a result of the magnetic field of the magnet assembly (18, 22) of the rotating component (14) and converts the energy into a voltage which is provided for the voltage supply of the multi-turn sensor (16).

2. Method according to claim 1, characterized in that an electric motor (14) which can drive the actuator is used as the rotating member, the wiegand wire unit (19) being powered from a main magnet (22) of the electric motor which constitutes the magnetic assembly.

3. Method according to claim 1 or 2, characterized in that in the case of de-energizing of the actuator, the multi-turn sensor (16) transitions to an operating state after receiving the voltage delivered by the wiegand wire unit (19), in which it measures and stores the current position of the member (14).

4. The method of claim 1, 2 or 3Characterized in that, in the event of the actuator being switched on, the multi-turn sensor (16) is controlled by the supply voltage of the controller (15) or the battery voltage (U)_Batt) A supply voltage or a voltage supplied by the energy of the wiegand wire unit (19), wherein the angle of the component (14) and/or the number of revolutions of the component (14) is determined by the multi-turn sensor (16).

5. Method according to claim 4, characterized in that the energy accumulator (21) of the multi-turn sensor (16) is charged by means of energy supplied by the main magnet (22) of the electric motor (14) through the Wiegand wire unit (19) to operate the multi-turn sensor (16) autonomously.

6. Method according to claim 5, characterized in that the electric motor (14) is rotated through a predefined angular range before the measuring process in order to charge the energy accumulator (21).

7. Device for determining the absolute position of a component of an actuator, in particular a clutch actuator, which rotates about an axis of rotation, having a multi-turn sensor (16) for determining the absolute position of the component (14) carrying a magnetic element (18) which performs a rotary motion with the component (14), characterized in that the rotating component (14) has a magnet assembly (18, 22) which is arranged opposite at least one wiegand wire unit (19) which is connected to the multi-turn sensor (16) for supplying energy to the multi-turn sensor.

8. The device according to claim 7, characterized in that the magnetic assembly is constituted by a magnetic element (18) arranged on an end side of the rotating member (14), wherein the magnetic element (18) is an integral part of a sensor.

9. The device of claim 7, wherein the magnet assembly (22) is an integral part of the rotating member (14).

10. The device according to claim 9, characterized in that said rotating member is configured as an electric motor (14) and in that said magnetic assembly is constituted by a main magnet (22) of said electric motor (14).

Technical Field

The invention relates to a method for determining the absolute position of a component of an actuator, in particular a clutch actuator, which rotates about an axis of rotation, wherein a magnetic element which rotates along with the component is arranged on the component, and the absolute position of the magnetic element is determined by means of a multiturn sensor which is opposite the magnetic element and is supplied with a voltage.

Background

In clutch actuation systems of motor vehicles, in particular electrohydraulic clutch actuation systems, the piston of the master cylinder is driven by a reversing electric motor, which is controlled by a control unit. The piston of the master cylinder, which, depending on its position, delivers hydraulic fluid via a hydraulic line to the slave cylinder, which also has a piston, is displaced by the hydraulic fluid, whereby a force is exerted on the clutch, thus causing the clutch to change its position.

In order to accurately operate the electric motor and thus adjust the precise clutch position, the angular position of the rotor of the commutated electric motor must be accurately detected. As is known from the unpublished patent application of the applicant, document No. DE 102016212173.1, the angular position or the number of revolutions of the rotor is monitored by means of a multiturn sensor. In this case, such a multi-turn sensor is connected directly to the power supply of the controller, so that the rotation of the magnet can be detected continuously. A continuous current is required for continuous monitoring of the magnet rotation. If the sampling rate of the multi-turn sensor is too high, very high current consumption is required. If the sampling rate is too low, the rotation of the rotor may be missed.

Disclosure of Invention

The object of the invention is therefore to provide a method and a device for determining the absolute position of a rotary member of an actuator, wherein a simple, robust and cost-effective multi-turn sensor can be used, which self-learns to retain its absolute position at the belt end (Bandende).

According to the invention, this technical problem is solved by: the wiegand wire unit monitors the movement of the magnetic assembly of the rotating member and, upon detection of the movement, generates energy from the magnetic field of the magnetic assembly of the rotating member and converts this energy into a voltage which is provided for the voltage supply of the multi-turn sensor. A magnetic field is built up by the magnetic assembly of the rotating member as the member rotates, which is detected by the wiegand wire unit. The energy of the magnetic field is converted by the wiegand wire unit into a voltage, which is supplied to the multi-coil sensor. Thus, the multi-turn sensor is always energized when the member rotates. The voltage supply is effected even if the actuator is de-energized and the member performs an unforeseen movement. By means of the method, the absolute position of the electric motor can be determined continuously outside the measuring process for angle or revolution measurement.

Advantageously, an electric motor, which can drive the actuator, is used as the rotating member, the wiegand wire unit deriving energy from the main magnet of the electric motor, which constitutes the magnetic assembly. In this method, the magnet already present in the motor is used to obtain energy for the multi-turn sensor. In this case, a separate magnet for forming a magnetic field may be eliminated.

In one embodiment, in the event of a power failure of the actuator, the multi-turn sensor, after receiving the voltage transmitted by the wiegand wire unit, changes to an operating state in which it measures and stores the current position of the component. In this case, the multi-turn sensor is only energized for as long as a temporary measurement and storage procedure is required when the actuator is de-energized.

In one variant, the multi-turn sensor is supplied with the supply voltage of the controller or with the battery voltage or with the energy of the wiegand wire unit when the actuator is switched on, wherein the angle of the component and/or the number of revolutions of the component is determined by the multi-turn sensor. The multi-turn sensor is thus able to reliably measure the position of the rotary member in any state of the actuator, so that the controller is always provided with the current position of the rotary member when the measurement process is started with the normal operating state switched on.

In one embodiment, the energy accumulator of the multi-turn sensor is charged by means of energy supplied by the main magnet of the electric motor via the wiegand wire unit in order to operate the multi-turn sensor autonomously. Based on the energy stored in the energy store, the multi-turn sensor can also be supplied with energy during normal operating conditions simply and independently of the battery voltage and the supply voltage of the control unit.

Advantageously, the electric motor is rotated through a predetermined angular range before the measuring process in order to charge the energy accumulator. Thereby ensuring that there is sufficient energy to operate the multi-turn sensor.

A further development of the invention relates to a device for determining the absolute position of a component of an actuator, in particular a clutch actuator, which rotates about an axis of rotation, having a multiturn sensor for determining the absolute position of the component carrying a magnetic element, which moves rotationally with the component. In a device in which a cost-effective and robust multi-turn sensor can be used, the rotary member has a magnetic assembly which is arranged opposite at least one wiegand wire unit which is connected to the multi-turn sensor for supplying energy to the multi-turn sensor. Since the magnetic assembly provides a changing magnetic field when the component rotates, the magnetic energy is converted by the wiegand wire unit into electrical energy, by means of which the multi-turn sensor is supplied.

Advantageously, the magnetic assembly is formed by a magnetic element of the sensor, which is arranged on the end side of the rotary component. Thereby, the multi-turn sensor is energized with a magnetic assembly that is present in the actuator itself, which reduces the cost of the method.

In one alternative, the magnetic assembly is an integral part of the rotating member.

In one embodiment, the rotary component is designed as an electric motor, and the magnet assembly is formed by the main magnet of the electric motor. Since the rotor of the electric motor has a plurality of main magnets, strong magnetic field variations are caused by the multiple pole transitions of the rotating electric motor, which lead to a higher energy supply.

Advantageously, at least one wiegand wire unit is configured inside the electric motor realized as a rotating member and opposite to the main magnet of the electric motor constituting the magnetic assembly. Since upon rotation over 360 ° multiple pole transitions occur between the respective main magnets of the motor, more energy is provided by the rotation.

In one embodiment, at least one wiegand wire unit is connected to the energy accumulator to provide energy to the multi-turn sensor. The accumulator is charged when the multi-turn sensor is inactive. The energy stored in the accumulator is consumed by the multi-turn sensor while the multi-turn sensor is active.

In one variant, the multi-turn sensor in the ready state and/or the operating state is connected to the battery voltage or to the supply voltage of the controller. Since the absolute position of the multi-turn sensor in any state of the multi-turn sensor is known, a corresponding commutation of the motor can be carried out when the control is restarted by means of the current position of these known actuators.

Drawings

There are various embodiments of the present invention. One of which is explained in detail in accordance with the illustration shown in the drawing.

Wherein:

figure 1 shows a schematic diagram of a clutch operating system for operating an automatic clutch,

figure 2 shows a first embodiment of the device according to the invention with one wiegand wire unit,

figure 3 shows an embodiment of the device according to the invention with one wiegand wire unit,

fig. 4 shows a second embodiment of the method according to the invention with two wiegand wire units.

Detailed Description

Fig. 1 shows a simplified clutch actuation system 1 for an automatic clutch. The clutch actuation system 1 is provided in the drive train of a motor vehicle for a friction clutch 2 and comprises a master cylinder 3 which is connected to a slave cylinder 5 via a hydraulic line 4, referred to as a pressure line. In the slave cylinder 5, a slave piston 6 is movable back and forth, which via an actuating element 7 actuates the friction clutch 2 with an interposed bearing 8.

The actuator cylinder 3 can be connected to the compensation tank 9 via a connection port. The drive piston 10 is mounted in the drive cylinder 3 so as to be axially movable. The piston rod 11 of the master cylinder 3 is coupled to a motor-type servo drive 13 via a screw 12. The motor-type servo drive 13 includes a motor 14 configured as a commutation motor and a controller 15. The screw 12 converts the rotational movement of the electric motor 14 into a longitudinal movement of the master piston 10 of the master cylinder 3. The friction clutch 2 is thus automatically operated by the electric motor 14, the spindle 12, the master cylinder 3 and the slave cylinder 5.

Because the motor 14 is a commutated dc motor, its absolute position needs to be known to adjust the orientation of the motor 14. The absolute position is detected by means of the multi-turn sensor 16. The multi-turn sensor 16 is connected to the controller 15 in its normal operating state and is supplied with its supply voltage. The multiturn sensor 16 is an integral part of the chip 7, as shown in fig. 2. The chip 17 is arranged such that the multi-turn sensor 16 is opposed to the rotor of the motor 14. Fig. 2 shows only one magnetic element 18 for the sake of clarity, which is firmly fixed to the end face of the rotor of the electric motor 14 and follows it in a rotary motion. The magnetic element 18 interacts with the multi-turn sensor 16 when determining the absolute position of the motor 14.

The magnetic element 18 is monitored by an opposing wiegand wire unit 19, which is connected via a line 20 to a buffer capacitor 21 of the multiturn sensor 16. In addition, the multi-turn sensor 16 is coupled to the battery voltage U_BattAnd (4) coupling.

In normal operation of the actuator 3, 12, 13, the chip 17 is located at the supply voltage of the controller 15 and provides the angle of the magnetic element 18 and at the same time counts the number of revolutions of the motor 14. The number of revolutions is necessary to properly regulate the commutation of the motor 14.

Alternatively to the multi-turn sensor 16 being supplied with energy by the supply voltage of the controller 15, the required energy can also be obtained from the magnetic field of the rotating magnetic element 18. This is achieved by means of a wiegand wire unit 19. The wiegand wire unit 19 is a sensor having a wiegand wire as a main structural element, the wiegand wire having a hysteresis curve including a significant transition point by parallel soft magnetic regions and hard magnetic regions, the transition point being known as the wiegand effect. The sudden change in magnetization caused by the change in position of the magnetic element 18 of the rotor of the motor 14 induces a voltage in the coil near the wiegand wire. The voltage is transmitted to the chip 17 via line 20, thereby energizing the multi-turn sensor 16. But may also be charged based on the voltage of the buffer capacitor 21 that powers the multi-turn sensor 16.

Because the magnetic element 18 comprises a two-pole magnet, the magnetic change measured by the wiegand wire unit 19 is very small, which does not always suffice for the operation of the multi-turn sensor 16. The wiegand wire unit 19 is therefore arranged such that it is opposite the main magnet 22 of the motor 14 (fig. 3). A stronger magnetic field is induced by the pole transition of the main magnet 22, thereby providing more energy via a 360 ° rotation that can be used to autonomically supply the multi-turn sensor 16 to measure the angle of the motor 14. This energy provided by the wiegand wire unit 19 can be used to charge the buffer capacitor 21 when the actuators 2, 12, 13 are switched off. In this case, the rotor of the electric motor 14 is rotated over a defined angular range before the measuring process in order to store sufficient energy in the buffer capacitor 21.

As can be seen from fig. 4, a plurality of wiegand wire units 19.1, 19.2 can also be arranged opposite the main magnet 22 of the motor 14 to charge the buffer capacitor 21, thereby obtaining more energy from the magnetic field of the rotating rotor of the motor 14. In a particularly simple embodiment, the at least one wiegand wire unit 19 is an integral part of the electric motor 14 and does not need to be adjusted separately relative to the rotor of the electric motor 14.

List of reference numerals

1 Clutch actuation System

2 Friction clutch

3 driving cylinder

4 hydraulic pipeline

5 slave cylinder

6 driven piston

7 operating element

8 bearing

9 compensating container

10 active piston

11 piston rod

12 screw

13 Servo driving device

14 motor

15 controller

16 multi-turn sensor

17 chip

18 magnetic element

19 Wiegand wire unit

20 lines

21 buffer capacitor

22 main magnet

23 diode