EP3746746A1 - Induktiver winkelsensor für eine kraftfahrzeuglenkung - Google Patents
Induktiver winkelsensor für eine kraftfahrzeuglenkungInfo
- Publication number
- EP3746746A1 EP3746746A1 EP19702397.1A EP19702397A EP3746746A1 EP 3746746 A1 EP3746746 A1 EP 3746746A1 EP 19702397 A EP19702397 A EP 19702397A EP 3746746 A1 EP3746746 A1 EP 3746746A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- angle sensor
- steering shaft
- coils
- angle
- electrically conductive
- 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.)
- Withdrawn
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
- G01D5/14—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 the magnitude of a current or voltage
- G01D5/20—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 the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/204—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 the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
- G01D5/2053—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 the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by a movable non-ferromagnetic conductive element
- G01D5/206—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 the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by a movable non-ferromagnetic conductive element constituting a short-circuiting element
-
- 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
- G01D5/14—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 the magnitude of a current or voltage
- G01D5/20—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 the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/2006—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 the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/202—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 the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by movable a non-ferromagnetic conductive element
-
- 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
- G01D5/14—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 the magnitude of a current or voltage
- G01D5/20—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 the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/204—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 the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
- G01D5/2053—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 the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by a movable non-ferromagnetic conductive element
-
- 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
- G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
- G01D2205/70—Position sensors comprising a moving target with particular shapes, e.g. of soft magnetic targets
- G01D2205/77—Specific profiles
-
- 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
- G01D5/243—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 the phase or frequency of AC
Definitions
- the present invention relates to an angle sensor having the features of the preamble of claim 1, an electromechanical power steering system and a steer-by-wire steering system for a motor vehicle having the angle sensor and a method for determining a rotational angle of the rotational position of a rotatably mounted steering shaft of a motor vehicle the features of the preamble of claim 15.
- Angle sensors are used in a motor vehicle, among other things, to measure the steering angle of the steering wheel.
- angle sensors are magnetic sensors whose measurement can easily be disturbed by external magnetic fields. Motor vehicles will be operated in the future, and in part already, fully or partially electrically, which can lead to high external field influence measurements by high-current cables, which are often in the vicinity of the steering system. Furthermore, currently used magnetic sensors have a low accuracy.
- steer-by-wire steering systems require higher resolution angle sensors than conventional electromechanical steering systems to replace torque-based steering control.
- Claim 1 and a method for determining a rotational angle of the rotational position of a rotatably mounted steering shaft of a motor vehicle with the features of claim 15.
- an angle sensor for measuring a rotational angle of the rotational position of a steering shaft of a motor vehicle in comparison to a predefined Starting rotational position provided.
- the angle sensor is an inductive sensor having a rotatably connected to the steering shaft carrier plate and a relation to the support plate fixed circuit board, wherein on the support plate at least one electrically conductive track and on the circuit board a scanning device with two coils that are part of a resonant circuit are arranged, and wherein the scanning device for scanning the at least one electrically conductive track for generating an angle-dependent sensor signal is formed during rotational movement of the steering shaft.
- the inductive sensor system on which the angle sensor is based is one
- Non-contact, short-range sensor technology that allows low-cost, high-resolution detection of conductive objects in the presence of dust, dirt, oil and moisture, making them highly reliable.
- the at least one electrically conductive track is self-contained and extends around the center of the carrier plate.
- the at least one electrically conductive track has a wave pattern that allows an absolute angle determination via a steering shaft rotation.
- a single electrically conductive trace is provided, which is scanned by the two coils, the two coils being arranged at an angle of 90 degrees to each other.
- the scanning device preferably has an electronic control unit, which is set up by means of a Cordic algorithm, the rotation angle of
- circuit board is arranged asymmetrically to the center of the steering shaft, since this configuration allows a particularly compact design.
- two electrically conductive tracks are preferably provided, each of which is scanned by one of the two coils.
- the two electrically conductive tracks do not overlap.
- the two coils are stretched coils with an inhomogeneous magnetic field.
- the stretched coils along the radius are arranged one behind the other on the circuit board and formed stretched in the direction of the radius. A displacement of the part of the electrically conductive track located above the track along the radius thus leads to a change in the resonant frequency of the resonant circuit, which can be detected.
- the two electrically conductive tracks in their wave pattern on an equal number of wave crests and wave troughs, which are arranged circumferentially offset from each other on the support plate.
- the measured signal can be clearly assigned to a rotation angle within a revolution of the steering shaft.
- the above-described electrically conductive traces are formed of copper.
- the two coils are arranged to be used independently of each other. This allows, for example, the counting of the revolutions of the steering shaft or the detection of a sector.
- an electromechanical power steering system for a motor vehicle, comprising a steering shaft which is rotatably mounted about a steering shaft axis and can assume different rotational positions, a
- Electric motor to assist a steering movement and a previously described inductive angle sensor.
- the inductive angle sensor may also be part of a steer-by-Wi steering system for motor vehicles, comprising a steering actuator acting on the steered wheels, electronically controlled as a function of a driver's steering request, a reaction of the road to a control-transmitting feedback actuator, and a control unit that the feedback actuator and the
- a method for determining a rotational angle of the rotational position of a rotatably mounted steering shaft of a motor vehicle is provided, wherein in the method, the rotational position of the rotation of the steering shaft is measured with an inductive angle sensor having two spatially fixed coils which are part of a resonant circuit, wherein the coils at least one rotating with the steering shaft, electrically conductive, extending around the steering shaft and in to scan closed track, in which a change of a resonant frequency of the resonant circuit is detected.
- Fig. 1 a schematic representation of a steering system of a
- FIG. 2 shows a schematic representation of a steering system of a
- Fig. 3 is a simplified representation of an inductive sensor with
- Fig. 4 is a plan view of two electrically conductive tracks, which are each scanned by a stretched coil, as well as
- Fig. 5 a schematic representation of an electromechanical
- FIG. 1 shows a rotating steering shaft 1 of a steer-by-wire motor vehicle steering system with an angle sensor 2 and an associated electronic control unit (ECU) 3.
- the angle sensor 2 has a carrier plate 4 connected to the rotating shaft 1 and a stationary scanning device 5 which is arranged on a printed circuit board 6 connected to the electronic control unit 3.
- the carrier plate 4 has a track 7 made of an electrically conductive material, preferably copper.
- the track 7 is self-contained and has no beginning and no end.
- the pattern of the track 7 is preferably a wave pattern that is curved
- the wave pattern has peaks and troughs and repeats periodically.
- the pattern of the track 7 is not formed concentrically with the steering shaft. It is designed in such a way that an absolute angle determination is possible via a shaft rotation.
- the printed circuit board 6 is preferably formed as a PCB (printed circuit board) and carries all electronic components of the sensor 2, in particular an evaluation circuit and the coils 80,81.
- the circuit board 6 with the coils 80,81 is located immediately below the copper track 7.
- the circuit board is not arranged concentrically to the central axis of the steering shaft 1.
- the angle of rotation is estimated by the inductive sensor 1, in which the copper track 7 is queried on the support plate 4.
- the coils 80,81 are parts of a resonant circuit. They 80,81 produce a high-frequency magnetic field. As the track 7 moves in the magnetic field, an induction current begins to flow due to the electromagnetic induction. Based on the mutual inductance coupling, the resonant frequency of the resonant circuit changes. When a non-ferrous metal object such as the copper trace approaches, the resonant frequency of the electrical resonant circuit increases. The mutual inductance coupling thus changes as the copper trace rotates across the coils 80,81.
- the sensor monitors the
- Two coils 80, 81 are sufficient to calculate the angle when placed at 90 degrees to each other.
- the output of the two coils 80, 81 is a sine signal and a cosine signal in the case of the previously described triangular pattern.
- the angle calculation is based on the industry standard Coordinate Rotation Digital Computer (Cordic) algorithm. This algorithm makes it possible to efficiently compute elementary trigonometric and hyperbolic functions using almost exclusive use of fast operations such as additions and multiplications with powers of two.
- Multiple printed circuit boards with two coils each can be used to provide high redundancy and electronic error compensation capability (misalignment, mechanical errors).
- the coil pairs may be arranged in pairs on separate PCBs or on a common PCB.
- Figure 2 shows an embodiment in which two coils 82,83 along the radius of the circuit board 60 are aligned one behind the other.
- Support plate 4 has two tracks 70,71 of an electrically conductive
- the tracks 70, 71 are self-contained, without beginning and end, and extend around the steering shaft 1.
- a track 70, 71 is in each case interrogated by one of the two coils 82, 83 by measuring mutual induction.
- the circuit board 60 is fixed in space and the support plate 4 with the two tracks rotates with the steering shaft 1.
- the steering shaft 1 is in the example shown part of a steer-by-wire steering, which has no mechanical connection to the steering gear.
- the coils 82, 83 are elongated coils.
- the operation of the stretched coils 82, 83 is shown in FIG.
- the stretched coils 82,83 have a non-homogeneous magnetic field, i. H. on one side of the coil, the magnetic field is stronger than on the other side. This is achieved in the case shown by the rectangular
- Windings 800 of the coil 82, 83 lie inside one another and become longer as viewed from the inside to the outside. On the one short side of the coil 82,83, therefore, the turns are very close to each other, while on the other short side of the coil 82,83 the turns have a wide, uniform distance from each other. The magnetic field is therefore to the right of the
- FIG. 4 shows an example of an arrangement of two tracks 70, 71 and two elongate coils 82, 83.
- the coils 82,83 extend in the radial direction and are placed one behind the other in the radial direction. They are each arranged directly below the corresponding track 70,71.
- the patterns of the tracks are preferably wave patterns that have curved, rounded triangular shapes that extend around the center 40 of the carrier plate 4.
- Both tracks 70, 71 preferably have the same number of wave crests 90 and wave troughs 91, which are distributed uniformly over the circumference.
- the wave crests 90 and wave troughs 91 of the two tracks 70, 71 are arranged with an angular offset in the circumferential direction relative to one another.
- the tracks 70,71 are thus designed so that an absolute angle determination is possible over a shaft rotation.
- the two tracks and the respective readout of a stretched coil allow a determination of the absolute position also immediately after a wake-up of the sensor. A renewed calibration can thus be dispensed with.
- the illustrated arrangement of the elongated coils 82,83 is only exemplary. It may also be provided to place the coils on opposite sides of the carrier plate center 40.
- FIG. 5 shows a steering shaft 11 of an electromechanical steering system.
- the angle sensor 2 corresponds to the sensor of Figure 1. Die
- Support plate 4 of the sensor with the track 7 rotates with the steering shaft 11 and the circuit board 6 with the coils 80,81 is disposed adjacent to the steering shaft 11 below the track 7.
- steer-by-wire steering systems is in electromechanical steering systems significantly less space for the circuit board 6 and the electronic control unit 3 available because the steering shaft 11 via mechanical components with the steering gear
- the two coils 80,81 can be used independently of each other, for example, to count the revolutions of the steering shaft or to detect a sector. But they can also be used together, for example in a steering angle sensor with a reduction gear that works on the vernier scale. It may also be provided to use the angle sensor of Figures 2 to 4 for measuring the steering angle of an electromechanical steering system.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018102094.5A DE102018102094A1 (de) | 2018-01-31 | 2018-01-31 | Induktiver Winkelsensor für eine Kraftfahrzeuglenkung |
| PCT/EP2019/052045 WO2019149669A1 (de) | 2018-01-31 | 2019-01-29 | Induktiver winkelsensor für eine kraftfahrzeuglenkung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3746746A1 true EP3746746A1 (de) | 2020-12-09 |
Family
ID=65243552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19702397.1A Withdrawn EP3746746A1 (de) | 2018-01-31 | 2019-01-29 | Induktiver winkelsensor für eine kraftfahrzeuglenkung |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3746746A1 (de) |
| DE (1) | DE102018102094A1 (de) |
| WO (1) | WO2019149669A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865435A (zh) * | 2019-11-12 | 2021-05-28 | 舍弗勒技术股份两合公司 | 机动车辆及其传感器 |
| US11305368B2 (en) | 2020-01-30 | 2022-04-19 | Illinois Tool Works Inc. | Inductive position sensor with switch function |
| CN111623809B (zh) * | 2020-06-05 | 2022-03-18 | 鹤岗市振金石墨烯新材料研究院 | 基于石墨烯镀层的电动机轴传感器 |
| CN115236640A (zh) * | 2021-04-23 | 2022-10-25 | 上海禾赛科技有限公司 | 激光雷达的扫描装置的角度测量装置、角度测量方法 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9613673D0 (en) * | 1996-06-28 | 1996-08-28 | Scient Generics Ltd | Rotary spiral improvements |
| DE19738836A1 (de) * | 1997-09-05 | 1999-03-11 | Hella Kg Hueck & Co | Induktiver Winkelsensor |
| DE19941464A1 (de) * | 1999-09-01 | 2001-03-15 | Hella Kg Hueck & Co | Induktiver Positionssensor |
| DE102004027954B4 (de) * | 2004-06-08 | 2018-06-14 | HELLA GmbH & Co. KGaA | Induktiver Winkelmesser, insbesondere für die Messung von Torsionswinkeln |
| DE102004033083A1 (de) * | 2004-07-08 | 2006-01-26 | Robert Bosch Gmbh | Wirbelstromsensor zur kontinuierlichen Weg- oder Winkelmessung |
| EP1715298B1 (de) * | 2005-04-19 | 2017-07-19 | Mitutoyo Corporation | Absoluter Drehgeber und Mikrometer |
| DE102007053601A1 (de) * | 2007-11-09 | 2009-05-20 | Vogt Electronic Components Gmbh | Lagegeber mit Kunststoffkörper |
| DE102008012923A1 (de) * | 2008-03-06 | 2009-09-10 | Hella Kgaa Hueck & Co. | Induktiver Winkelsensor |
| DE102013213462A1 (de) * | 2013-07-09 | 2015-01-15 | Robert Bosch Gmbh | Verfahren zum Ermitteln einer aktuellen Temperatur eines mit mindestens einer Spule versehenen Sensors sowie entsprechender Sensor |
| DE102014218982A1 (de) * | 2014-09-22 | 2016-03-24 | Robert Bosch Gmbh | Sensoranordnung zur Weg- und/oder Winkelmessung |
| DE102015226743A1 (de) * | 2015-12-28 | 2017-06-29 | Robert Bosch Gmbh | Mechanisches Bauteil und entsprechende Betriebs- und Herstellungsverfahren |
| DE102016015720A1 (de) * | 2016-02-24 | 2017-08-24 | Robert Bosch Gmbh | Drehwinkelsensor |
| DE102016005013A1 (de) * | 2016-04-26 | 2017-10-26 | Thyssenkrupp Ag | Hands-On/-Off-Erkennung in einem Steer-by-Wire-System |
| DE102016217255A1 (de) * | 2016-09-09 | 2018-03-15 | Robert Bosch Gmbh | Drehwinkelsensor und Statorelement für diesen |
-
2018
- 2018-01-31 DE DE102018102094.5A patent/DE102018102094A1/de not_active Withdrawn
-
2019
- 2019-01-29 EP EP19702397.1A patent/EP3746746A1/de not_active Withdrawn
- 2019-01-29 WO PCT/EP2019/052045 patent/WO2019149669A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019149669A1 (de) | 2019-08-08 |
| DE102018102094A1 (de) | 2019-08-01 |
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