WO2024256052A1 - Lenkaktuator für ein steer-by-wire-lenksystem eines kraftfahrzeugs und verfahren zum betrieb eines lenkaktuators - Google Patents
Lenkaktuator für ein steer-by-wire-lenksystem eines kraftfahrzeugs und verfahren zum betrieb eines lenkaktuators Download PDFInfo
- Publication number
- WO2024256052A1 WO2024256052A1 PCT/EP2024/058935 EP2024058935W WO2024256052A1 WO 2024256052 A1 WO2024256052 A1 WO 2024256052A1 EP 2024058935 W EP2024058935 W EP 2024058935W WO 2024256052 A1 WO2024256052 A1 WO 2024256052A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- actuator
- sensor
- steering
- spindle nut
- steering actuator
- 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.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0442—Conversion of rotational into longitudinal movement
- B62D5/0445—Screw drives
- B62D5/0448—Ball nuts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D15/00—Steering not otherwise provided for
- B62D15/02—Steering position indicators ; Steering position determination; Steering aids
- B62D15/021—Determination of steering angle
- B62D15/0225—Determination of steering angle by measuring on a steering gear element, e.g. on a rack bar
Definitions
- the invention relates to a steering actuator for a steer-by-wire steering system of a motor vehicle, comprising an actuator housing in which an actuator rod is mounted so as to be axially translationally displaceable, said actuator rod having a coaxial spindle thread which engages in a spindle nut which is axially supported in the actuator housing and can be driven in rotation by a motor, wherein a sensor device is provided for detecting the position of the actuator rod in the actuator housing.
- a method for operating a steering actuator is also the subject of the invention.
- a steering actuator is used in a motor vehicle steering system to generate the mechanical steering angle of one or more steerable wheels.
- steering commands are entered manually into a steering handle, or in autonomous ferry operation they are generated automatically and converted into electrical control signals that control an electro-motor steering actuator to generate a steering angle of the wheels.
- a generic motorized steering actuator has an actuator rod that is adjustable in its longitudinal direction, usually transversely to the direction of travel relative to the vehicle body, in an actuator housing that is fixed relative to the vehicle body.
- the actuator rod is hinged to the steering knuckle of one or more steerable wheels of the vehicle.
- the axial translational displacement of the actuator rod in the actuator housing causes a mechanical steering angle of the steerable wheels.
- the linear displacement is achieved by an electric motor-driven spindle drive.
- This comprises an axially supported spindle nut that is rotatably mounted in the actuator housing and into which a spindle thread of the actuator rod engages.
- the spindle nut can be driven in rotation by an electric motor controlled by electrical control commands, whereby the actuator rod is linearly displaced in accordance with the rotation of the spindle nut and generates a mechanical steering angle via tie rods connected to the steering knuckles.
- the steering angle is correlated with the axial position of the actuator rod in the actuator housing. To ensure safe operation, this linear position is recorded using an electrical sensor device, with the electrical position measurements being fed into an electrical control circuit of the steering system as actual values.
- the actuator rod has a rack section to which a measuring wheel of a measuring sensor is coupled, which measures the axial position of the actuator rod.
- the sensor device can have axially successive markings introduced into the actuator rod, which are scanned by means of an electrical measuring sensor for position detection, as proposed, for example, in WO 2018/233849 A1.
- the known sensor devices enable reliable electrical measurement of the axial position of the actuator rod.
- the measuring section required in each case requires additional effort to machine the actuator rod, and the length of the measuring section, which corresponds at least to the maximum axial adjustment path, leads to a relatively large overall length.
- the measuring sensor attached to the actuator housing requires additional installation space, which is counteracting a compact design.
- a steering actuator for a steer-by-wire steering system of a motor vehicle comprising an actuator housing in which an actuator rod is mounted so as to be axially translationally displaceable, which has a coaxial spindle thread which engages in a spindle nut which is axially supported in the actuator housing and can be driven in rotation by a motor, wherein a sensor device is provided for detecting the position of the actuator rod in the actuator housing, it is provided according to the invention that the sensor device has a rotation sensor which interacts with the spindle nut.
- the angular position of the spindle nut is detected with respect to rotation around the axis of the actuator rod, which corresponds to the thread or spindle axis of the spindle thread, which is fixed with respect to rotation around the axis relative to the actuator housing. Because the angular position is clearly correlated with the axial position of the spindle thread via the pitch of the spindle thread, the axial position of the actuator rod relative to the actuator housing can be determined accordingly.
- the overall length can be shortened, which means that more compact dimensions of the steering actuator can be achieved.
- the measuring sensor can be integrated into the actuator housing in the area of the spindle nut bearing, which means that additional installation space can be saved compared to the prior art, in which a measuring sensor has to be arranged in the area of the markings at an axial distance from the spindle nut.
- a further advantage is that the linear feed of the actuator rod corresponding to the thread pitch is smaller than the correlated amount of circumferential movement in the circumferential direction when the spindle nut rotates, measured on the spindle nut in a radius outside the thread diameter.
- the manufacturing effort can be reduced by eliminating the processing required in the prior art to produce the markings.
- the rotary sensor is designed as an absolute angle sensor. This enables a measurement of the absolute rotary position of the spindle nut, i.e. the absolute angular position relative to the spindle thread. Accordingly, an absolute angle measurement value is clearly correlated with the absolute axial position of the actuator rod, or its position relative to the actuator housing. In this way, the effort required for position measurement can be kept low.
- it is possible to assign a clear, absolute measured value is assigned.
- an absolute measured value of the position of the actuator rod corresponding to the current adjustment state is stored electronically by the sensor device, and a subsequent rotation of the spindle nut is measured relatively and added to the stored measured value in order to keep the absolute position measured value up to date. This type of operation is also referred to as "sleep mode" capable. This allows an incremental encoder that can be implemented with little effort to be used, which converts the rotation of the spindle nut into an angle-resolved pulse sequence.
- the rotation sensor can be designed as a multi-turn sensor.
- a number of revolutions of the spindle nut are required, which corresponds to the number of threads of the spindle thread, or in other words, the number of revolutions corresponds to the ratio of the possible axial adjustment path relative to the pitch of the thread.
- a multi-turn sensor can also record the number of revolutions of the spindle nut, preferably as absolute measured values, so that the axial position of the actuator rod can be clearly measured in each adjustment state.
- the rotary sensor prefferably be magnetic and/or capacitive and/or optical.
- suitable, preferably contactless, measuring methods can be used for position detection.
- the spindle nut can have a magnetic, capacitive and/or optically detectable coding on its circumference, which can be measured in a circumferential direction by a measuring sensor of the sensor device.
- Such measuring methods can be integrated into the actuator housing with little space requirement.
- the rotary sensor has a sensor element attached to the spindle nut and a measuring sensor that interacts with it and is attached to the actuator housing.
- the sensor element can preferably be attached to the spindle nut over the entire circumference or can be integrated with it, for example in the form of a plurality of markings distributed over the circumference.
- the measuring sensor is thus designed to correspond to the measuring method used and is fixed axially or radially to the actuator housing relative to it. This means that rotation of the spindle nut with the required angular resolution can be achieved in a space-saving manner and with little effort.
- the sensor element it is possible for the sensor element to comprise a coaxial magnetic ring.
- the magnetic ring can, for example, be attached axially to the front of the spindle nut. It can preferably have an angle-dependent magnetic coding.
- the rotary sensor having an adjustment device.
- the adjustment device enables the measuring sensor to be adjusted relative to the sensor element.
- the optimal measuring distance can be easily set; in a non-contact measuring method, for example, an air gap as narrow as possible between the sensor element and the measuring sensor. This means that the sensor device can be easily calibrated during production after the sensor element and measuring sensor have been assembled.
- the adjustment device can preferably be designed to adjust the measuring sensor axially and/or radially relative to the sensor element.
- an axially and/or radially adjustable guide, an adjusting slide or the like can be provided in order to enable the positioning of a measuring sensor attached thereto at the optimal measuring distance.
- the adjustment device can preferably enable axial and/or radial adjustment between the sensor element and the measuring sensor in order to enable optimal spatial positioning.
- the adjusting device has at least one adjustment drive that can be adjusted relative to the actuator housing.
- Such an adjustment drive can be designed to be manually adjustable and can, for example, comprise an adjusting screw that is screwed into an adjusting thread supported on the actuator housing and is connected to the measuring sensor.
- the spindle nut is designed as a recirculating ball nut.
- the spindle thread is thus designed to form a ball screw drive (KGT).
- KGT ball screw drive
- the rotary sensor it is also conceivable and possible for the rotary sensor to interact with a pulley of the belt transmission.
- a KGT represents an efficient linear drive for converting the rotation of the spindle nut into an axial movement of the actuator rod. It is advantageous for the invention that the axial play to the spindle thread can be zero, so that an almost tolerance-free correlation between the rotational position of the spindle nut and the axial position of the actuator rod is possible.
- a rotational position (angular position) of the spindle nut relative to the actuator housing is measured by a rotation sensor of the sensor device, and an axial position of the actuator rod is determined from the detected rotational position.
- the axial position of the actuator rod in the actuator housing is determined from the measurement of the rotation of the spindle nut, taking the thread pitch into account.
- the direct correlation means that the necessary conversion can be carried out with little effort.
- Fig. 1 is a schematic representation of a steering system according to the invention
- Fig. 2 shows a steering actuator according to the invention in a perspective view
- Fig. 3 is a longitudinal section through the steering actuator according to Fig. 2,
- Fig. 4 is a schematic perspective sectional view of the steering actuator according to Figure 3. embodiments of the invention
- Fig. 1 shows a schematic representation of a steer-by-wire steering system 1, which comprises a steering column 2.
- This has a support unit 21 which can be mounted on a vehicle body (not shown), of which a steering spindle 22 is mounted so as to be rotatable about its longitudinal axis.
- a steering wheel 23 is mounted on the steering spindle 22 in a rotationally fixed manner for the input of manual steering commands.
- the steering column 2 accommodates a rotation angle and torque detection sensor system (not shown in detail), which converts a steering command introduced into the steering spindle 22 by rotation of the steering wheel 23 into an electrical control signal, namely a steering signal.
- the control signal is transmitted via an electrical control line 3 to an electrical steering actuator 4 according to the invention.
- the electrical control signal can also be provided automatically in autonomous ferry operation, without manual steering intervention.
- the steering actuator 4 - which is shown in detailed views in Figs. 2 to 4 - has an actuator housing 41, which has connecting elements (not shown here) for attachment to a vehicle body (not shown).
- an actuator rod 5 which extends along an axis A, which is also referred to as actuator axis A, transversely to the direction of travel of the vehicle, is mounted axially, i.e. displaceably in its longitudinal direction predetermined by this axis A, as indicated by the double arrow.
- the two outer ends of the actuator rod 5 protruding from the actuator housing 41 are each connected to a steerable wheel 61 via a tie rod 6, so that an axial displacement of the actuator rod 5 causes a steering angle of the wheel 61 relative to the roadway 62.
- the steering actuator 4 has an electric motor drive that can be electrically controlled via the control line 3 and has an electric motor 42 attached to the actuator housing 41.
- the motor 42 can drive a spindle nut 43 that is rotatably mounted in the actuator housing 41 and axially supported, which can be seen in Fig. 3.
- a spindle thread 51 formed on the actuator rod 5 engages in this.
- a linear spindle drive is formed, in which the actuator rod 5 can be moved axially, i.e. in its longitudinal direction, relative to the actuator housing 41 by the corresponding direction of rotation of the motor 42, as indicated by the double arrow in Fig. 3.
- the spindle nut 43 can preferably be designed as a recirculating ball nut, as in the example shown.
- Fig. 4 shows a partial longitudinal section in the area of the spindle nut 43 in a schematic perspective view.
- a sensor device has a rotary sensor 7 which has a magnetic ring 71 attached axially to the front side of the spindle nut 43, in the illustrations in Figs. 3 and 4 on the left front side of the spindle nut 43.
- the magnetic ring 71 is arranged coaxially to the axis A and has a magnetization encoded in the circumferential direction over its circumference, for example magnetic segments or the like.
- a measuring sensor 72 is attached to the actuator housing 41, which has an electronic magnetic sensor, for example a GMR sensor or the like.
- An adjusting device 8 is attached to the actuator housing 41, which comprises an axial adjustment drive 81, which has, for example, an adjusting screw that is screwed into a thread that is fixed relative to the actuator housing.
- the measuring sensor 72 is attached to a radially adjustable adjustment element 82, which can have an adjusting slide or an adjusting screw, and can thus be adjusted in the radial direction, as indicated by the double arrow.
- This adjusting element 82 can be axially displaced by adjusting the axial adjusting drive 81, as indicated by the double arrow.
- the measuring sensor 72 is connected to an electronic measuring and evaluation device (not shown), which evaluates the measured values recorded depending on the rotational position of the spindle nut 43 and can use this to determine an axial position of the actuator rod 5.
- a axis (actuator axis) A axis (actuator axis)
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24716760.4A EP4727823A1 (de) | 2023-06-13 | 2024-04-02 | Lenkaktuator für ein steer-by-wire-lenksystem eines kraftfahrzeugs und verfahren zum betrieb eines lenkaktuators |
| CN202480039610.4A CN121368550A (zh) | 2023-06-13 | 2024-04-02 | 用于机动车辆的线控转向系统的转向致动器、和用于运行转向致动器的方法 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BEBE2023/5486 | 2023-06-13 | ||
| BE20235486A BE1031698B1 (de) | 2023-06-13 | 2023-06-13 | Lenkaktuator für ein Steer-by-Wire-Lenksystem eines Kraftfahrzeugs und Verfahren zum Betrieb eines Lenkaktuators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024256052A1 true WO2024256052A1 (de) | 2024-12-19 |
Family
ID=86851687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2024/058935 Ceased WO2024256052A1 (de) | 2023-06-13 | 2024-04-02 | Lenkaktuator für ein steer-by-wire-lenksystem eines kraftfahrzeugs und verfahren zum betrieb eines lenkaktuators |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4727823A1 (de) |
| CN (1) | CN121368550A (de) |
| BE (1) | BE1031698B1 (de) |
| WO (1) | WO2024256052A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024206776A1 (de) * | 2024-07-18 | 2026-01-22 | Robert Bosch Gesellschaft mit beschränkter Haftung | Lenkgetriebe mit einem hochintegrierten Lenkwinkelsensor und Verfahren zum Betreiben desselben |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006122436A1 (de) * | 2005-05-19 | 2006-11-23 | Thyssenkrupp Presta Ag | Drehwinkelsensor |
| DE102013000898A1 (de) * | 2013-01-18 | 2014-07-24 | Volkswagen Aktiengesellschaft | Lenkhilfeeinrichtung mit Motor und Vorrichtung zur Lagesensierung |
| WO2018233849A1 (en) | 2017-06-23 | 2018-12-27 | Thyssenkrupp Presta Ag | Steer-by-wire steering system with absolute rack position sensor |
| US20220348250A1 (en) * | 2019-06-20 | 2022-11-03 | Mando Corporation | Steer-by-wire type steering apparatus |
| DE102021205316A1 (de) | 2021-05-26 | 2022-12-01 | Thyssenkrupp Ag | Lenkaktuator für ein Lenksystem und Lenksystem für ein Kraftfahrzeug |
-
2023
- 2023-06-13 BE BE20235486A patent/BE1031698B1/de active IP Right Grant
-
2024
- 2024-04-02 EP EP24716760.4A patent/EP4727823A1/de active Pending
- 2024-04-02 WO PCT/EP2024/058935 patent/WO2024256052A1/de not_active Ceased
- 2024-04-02 CN CN202480039610.4A patent/CN121368550A/zh active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006122436A1 (de) * | 2005-05-19 | 2006-11-23 | Thyssenkrupp Presta Ag | Drehwinkelsensor |
| DE102013000898A1 (de) * | 2013-01-18 | 2014-07-24 | Volkswagen Aktiengesellschaft | Lenkhilfeeinrichtung mit Motor und Vorrichtung zur Lagesensierung |
| WO2018233849A1 (en) | 2017-06-23 | 2018-12-27 | Thyssenkrupp Presta Ag | Steer-by-wire steering system with absolute rack position sensor |
| US20220348250A1 (en) * | 2019-06-20 | 2022-11-03 | Mando Corporation | Steer-by-wire type steering apparatus |
| DE102021205316A1 (de) | 2021-05-26 | 2022-12-01 | Thyssenkrupp Ag | Lenkaktuator für ein Lenksystem und Lenksystem für ein Kraftfahrzeug |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024206776A1 (de) * | 2024-07-18 | 2026-01-22 | Robert Bosch Gesellschaft mit beschränkter Haftung | Lenkgetriebe mit einem hochintegrierten Lenkwinkelsensor und Verfahren zum Betreiben desselben |
Also Published As
| Publication number | Publication date |
|---|---|
| CN121368550A (zh) | 2026-01-20 |
| BE1031698B1 (de) | 2025-01-23 |
| EP4727823A1 (de) | 2026-04-22 |
| BE1031698A1 (de) | 2025-01-15 |
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