EP3880538A1 - Steering column for a steering system of a motor vehicle comprising a control unit for two adjustment drives - Google Patents
Steering column for a steering system of a motor vehicle comprising a control unit for two adjustment drivesInfo
- Publication number
- EP3880538A1 EP3880538A1 EP19806120.2A EP19806120A EP3880538A1 EP 3880538 A1 EP3880538 A1 EP 3880538A1 EP 19806120 A EP19806120 A EP 19806120A EP 3880538 A1 EP3880538 A1 EP 3880538A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steering column
- connection
- drive
- drive motor
- drive motors
- 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- Withdrawn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
- 238000000034 method Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006386 memory function Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/16—Steering columns
- B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
- B62D1/181—Steering columns yieldable or adjustable, e.g. tiltable with power actuated adjustment, e.g. with position memory
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/16—Steering columns
- B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
- B62D1/185—Steering columns yieldable or adjustable, e.g. tiltable adjustable by axial displacement, e.g. telescopically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/16—Steering columns
- B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
- B62D1/187—Steering columns yieldable or adjustable, e.g. tiltable with tilt adjustment; with tilt and axial adjustment
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/68—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more dc dynamo-electric motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/03—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
- H02P7/04—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors by means of a H-bridge circuit
Definitions
- the present invention relates to a steering column for a steering system of a motor vehicle with the features of the preamble of claim 1 and a method for controlling two drive motors of a steering column adjustable in the longitudinal adjustment direction and height adjustment direction with the features of the preamble of claim 9.
- Adjustable steering columns are used to adapt the position of the steering wheel to the driver's sitting position and are known in different embodiments.
- the vertical inclination of the steering column (height adjustment) and the distance between the steering wheel and the driver (longitudinal adjustment) can be adjusted.
- Each of the adjustment motors is controlled by a separate control unit with control electronics.
- Each control electronics usually comprises an H-bridge with switch elements of the power electronics, in particular power MOSFETs.
- Each of the H-bridges includes one
- a steering column for a steering system of a motor vehicle has a first adjustment drive for adjusting the steering column in a longitudinal adjustment direction and a second adjustment drive for adjusting the steering column in a height adjustment direction, the first and second
- Adjustment drive each have a drive motor for adjusting the steering column, provided, the two drive motors having a common control unit which comprises three half-bridges arranged in parallel and connected between two voltage potentials, the
- Half bridges each have two switching elements connected in series, one of the switching elements being a high-side switch and the other switching element being a low-side switch, and each having a connection point between a high-side switch and a low-side switch. Switch of a half-bridge is formed, the connection point of a first
- Half bridge with a first connection of a first drive motor of the two drive motors, the connection point of a second half bridge with a second connection of the first drive motor, the connection point of a third half bridge with a second connection of a second Drive motor of the two drive motors and the connection point of the second half bridge is electrically conductively connected to a first connection of the second drive motor.
- the number of switching elements can thus be reduced to six compared to conventional control electronics from the prior art, which saves costs and reduces complexity.
- the second connection is the first
- Drive motor and the first connection of the second drive motor can be controlled simultaneously by the second half bridge.
- simultaneous adjustment in both directions can be achieved.
- the second connection of the first drive motor and the first connection of the second drive motor can be controlled alternately by the second half bridge. Then the adjustment drives are controlled separately from each other.
- Direction of rotation of the two drive motors preferably in opposite directions, so that preferably the steering column is retracted and retracted or extended and retracted simultaneously.
- the switching elements are preferably n-channel MOSFETs which are normally blocking.
- Switching elements of the first and third half-bridge can preferably be controlled with a PWM signal.
- the steering column comprises a support tube in which a casing tube is held so as to be displaceable in the longitudinal adjustment direction by means of the first adjustment drive, a steering spindle being rotatably mounted in the casing tube, and the support tube being pivotable on a body of the motor vehicle directly or indirectly connectable console is attached, the pivoting causing an adjustment of the casing tube and the steering spindle relative to the support unit in the height adjustment direction.
- the two drive motors are advantageously brushed DC motors. Alternatively, however, brushless, preferably synchronously controlled DC motors can be used.
- a method for controlling two drive motors of a steering column adjustable in the longitudinal adjustment direction and height adjustment direction is provided for a steering system of a motor vehicle, wherein a control unit for controlling the two drive motors comprises three half bridges arranged in parallel and connected between two voltage potentials, the half bridges each having two series connected Have switching elements, wherein one of the switching elements is a high-side switch and the other
- Switching element is a low-side switch, and wherein a connection point is formed between a high-side switch and a low-side switch of a half bridge, the connection point of a first half bridge with a first connection of a first drive motor of the two Drive motors, the connection point of a second half bridge with a second connection of the first drive motor, the connection point of a third half bridge with a second connection of a second drive motor of the two drive motors and the connection point of the second half bridge with a first connection of the second drive motor is electrically connected, wherein the first and the second drive motor can be controlled by means of the three half bridges.
- the reduced number of switching elements results in a cost advantage.
- the two drive motors In a first embodiment, the two drive motors
- Supply line (low or high side) can be assigned. It is advantageous if the two drive motors are driven in opposite directions and the drive in and out or in and out
- the two drive motors are activated alternately.
- the switching elements are preferably n-channel MOSFETs, which are normally blocking. Preferred embodiments of the invention are explained below with reference to the drawings. Components of the same type or having the same function are designated with the same reference symbols in the figures. It
- FIG. 1 a schematic perspective illustration of a steering column with an electrical adjustment
- FIG. 2 the steering column from FIG. 1 in a schematic side view
- Figure 3 the steering column of Figure 1 in a further schematic
- Figure 4 is a schematic sectional view through the steering column of the
- FIG. 2 along the plane AA from FIG. 2,
- Figure 5 a block circuit of a control of the actuators
- Figure 6 the block circuit of Figure 5 when driving an individual
- Adjustment drive, Figure 7 the block circuit of Figure 5 when driving an individual
- Figure 8 the block circuit of Figure 5 when driving an individual
- Figure 9 the block circuit of Figure 5 when driving the two
- Figure 10 the block circuit of Figure 5 when driving the two
- FIG. 1 to 4 show a steering column 1 which has a support unit 10 which can be connected to the chassis of a motor vehicle, not shown here, on which an adjusting unit 16 is held adjustable.
- the support unit 10 comprises a console 100, which on the chassis of the motor vehicle,
- the actuating unit 16 comprises a tubular casing 12, in which a steering spindle 14 is rotatably mounted.
- a steering wheel not shown here, can be fastened to the steering wheel end 141 of the steering spindle 14.
- the steering spindle 14 is used by a driver via the steering wheel on the steering spindle 14
- the steering shaft 14 can transfer the steering movement from the steering wheel to the steerable wheel with the interposition of a steering gear, optionally with the help of an assistant.
- the casing tube 12 is slidably held in a support tube 104 in a longitudinal adjustment direction X, the longitudinal adjustment direction X extending in the axial direction of the steering spindle 14.
- a longitudinal adjustment of the steering spindle 14 and thus the steering wheel, not shown, for adjusting the position of the steering wheel to the seating position of a driver of the motor vehicle can be achieved accordingly.
- the support tube 104 is pivotally attached to the bracket 100 and can be pivoted about a pivot axis 106 relative to the bracket 100.
- An adjustability of the adjusting unit 16 in a height adjustment direction Z, which is oriented essentially perpendicular to the longitudinal adjustment direction X, is made possible by the fact that the casing tube 12 is held on the bracket 100 via a pivoting mechanism 18. This results in a pivotability of the casing tube 12 and the steering spindle 14 with respect to the support unit 10 and in particular with respect to the bracket 100 about the pivot axis 106 such that a height adjustment of the one not shown here and at the
- Steering spindle 14 arranged steering wheel is reached in order to achieve an adjustment of the position of the steering wheel to the seat position of the driver.
- Adjustment drive 2, 2 ' there is a separate one for each of the two adjustment directions Adjustment drive 2, 2 'provided with a separate adjustment gear each, comprising a threaded rod 26, 26', and a spindle nut 3.
- a first adjustment drive 2 is provided, by means of which an adjustment of the actuating unit 16 in relation to the support unit 10 in the longitudinal adjustment direction X can be achieved.
- the adjustment drive 2 comprises a threaded rod 26 which is connected to the casing tube 12 via a linkage lever 120.
- the articulation lever 120 is displaceably guided in a slot 110 in the support tube 104 in such a way that the articulation lever 120 is displaced relative to the
- Carrying unit 10 leads.
- the threaded rod 26 is held on the link lever 120 and extends in the longitudinal adjustment direction X.
- the threaded rod 26 is also held in a spindle nut 3, which has an internal thread 32, which with the
- the spindle nut 3 is rotatably but fixedly mounted with respect to the support tube 104 in a gear housing 34, so that rotation of the spindle nut 3 due to the thread engagement with the threaded rod 26 leads to an axial movement of the threaded rod relative to the spindle nut 3.
- a rotation of the spindle nut 3 causes a relative movement between the casing tube 12 and the support tube 104 in such a way that the position of the actuating unit 16 relative to the support unit 10 is adjusted by the rotation of the spindle nut 3.
- the adjustment drive 2 further comprises a drive motor 20, on the output shaft 24 of which a worm shaft 22 can be seen in FIG. 4 is arranged.
- the worm shaft 22 engages in an external toothing 30 of the spindle nut 3, the external toothing 30 being designed as a worm wheel.
- the axis of rotation of the spindle nut 3 is perpendicular to one another, as is known per se in a worm gear.
- the spindle nut 3 can be rotated by a rotation of the output shaft 24 of the drive motor 20, as a result of which a longitudinal adjustment in the X direction of the actuating unit 16 relative to the support tube 104 and thus a Displacement of the actuator 16 relative to the support unit 10 takes place.
- a second adjustment drive 2 ' can be seen particularly well in FIG. 3.
- this second adjustment drive 2 ′ has the same structure as the first adjustment drive 2.
- the second adjustment drive 2 'drives by means of a
- the threaded rod 26 ' is connected to an adjusting lever 181 via a joint 182.
- the adjusting lever 181 can be pivoted in a hinge axis 183 on the support tube 104 and in a hinge axis 184 on the bracket 100. This ensures that the threaded rod 26 'makes a corresponding adjustment to the pivoting mechanism 18 and thus to the actuating unit 16 and that via the spindle nut 3 Carrying tube 104 applies.
- a corresponding compensation function is integrated in one of the joints. In the example, this is represented by an elongated hole in the bracket of a bolt forming the pivot axis 106.
- the two drive motors 20, 20 'of the two adjustment drives 2.2' are driven by a common control unit 50 via motor lines 51, 52
- FIGS. 5 to 10 show a block circuit of the control unit 50, which is set up to control the two DC drive motors 20, 20 ', various control states being shown.
- the supply line 13+ is the positive pole of the supply line
- the supply line 13- is connected to the negative pole of the supply line or the ground connection of the on-board electrical system of the motor vehicle, which works in the usual way with direct voltage with negative ground.
- the control unit comprises three
- Half bridges HB1, HB2, HB3, a first half bridge HB1 comprising a series connection of a first and a fourth MOSFET S1 S4.
- a second, middle half-bridge HB2 comprises a series connection of a second and a fifth MOSFET S2, S5.
- a third half bridge HB3 comprises a series connection of a third and a sixth MOSFET S3, S6.
- MOSFETs S1, S2, S3 are assigned to the supply line 13+ and thus so-called high-side switches of the respective half-bridge.
- the MOSFETs S4, S5, S6 are assigned to the supply line 13- and thus so-called low-side switches of the respective half-bridge.
- the three half bridges HB1, HB2, HB3 are connected in parallel with one another, a connection point in each case between a first MOSFET one of the half bridges HB1, HB2, HB3 and a second MOSFET one of the half bridges HB1, HB2, HB3, each with one of the windings of the drive motors 20 , 20 'is electrically conductively connected.
- a connection point between the second MOSFET S2 and the fifth MOSFET S5 of the second half bridge HB2 is electrically conductively connected to one winding of each of the two drive motors 20, 20 '.
- each of the two drive motors 20, 20 'of two drive motors 20, 20 'of two
- Half bridges are driven, a first drive motor 20 being driven by the first and second half bridges HB1, HB2 and a second drive motor 20 'using the second and third half bridges HB2, HB3.
- the second half bridge HB2 is thus for the common control of both
- the MOSFETs are provided as drivers, which are usually switched so that their intrinsic or body diodes are switched in the reverse direction with respect to the on-board voltage. Depending on the control signals, they connect the lines 51, 52 either to the positive potential or to the ground potential. N-channel MOSFETs that are normally blocking are therefore preferably used as MOSFETs.
- the MOSFETs are each controlled via control line 54 by means of a gate driver 53. The currently controlled and thus switched MOSFETs are identified by a circle in the figures.
- FIG. 5 shows the connection of the MOSFETs S1 and S5.
- the MOSFET S5 therefore sets one of the motor lines of the drive motor 20 of the longitudinal adjustment device X to GND, while the second motor line via the MOSFET S1 receives positive tension.
- the MOSFETs S2, S3, S4 and S6 are blocked.
- the drive motor 20 therefore rotates to the right (clockwise rotation).
- the MOSFET S5 is switched on permanently and the control electrode (gate) of the MOSFET S1 is subjected to the required signal in the form of a pulse width modulation, abbreviated as the PWM control signal or PWM signal.
- the steering column is extended in the longitudinal adjustment direction X.
- the drive motor 20 'of the height adjustment device Z is switched off.
- FIG. 7 shows the switching state for the raising of the steering column by the height adjustment device Z.
- the MOSFETs S2 and S6 are switched on. Block the remaining MOSFETs.
- the MOSFET S2 is permanently switched on and a PWM signal is applied to the MOSFET S6.
- the drive motor 20 'of the height adjustment device Z rotates to the right.
- the drive motor 20 of the longitudinal adjustment device X is switched off.
- FIG. 8 shows the switching state for lowering the steering column by means of the height adjustment device Z.
- the MOSFETs S3 and S5 are turned on. Block the remaining MOSFETs.
- the MOSFET S4 is permanently switched on and a PWM signal is applied to the MOSFET S3.
- the drive motor 20 'of the height adjustment device Z rotates to the left.
- the drive motor 20 of the longitudinal adjustment device X is switched off.
- Length adjustment can be realized.
- Figures 9 and 10 show a simultaneous control of both drive motors 20, 20 'for the two adjustment directions in the longitudinal adjustment direction X and in the height adjustment direction Z through the middle half bridge HB2.
- either the second MOSFET S2 or the fifth MOSFET S5 of the second half bridge HB2 is closed.
- the control shown in Figure 9 causes the steering column to retract in the longitudinal adjustment direction and the steering column to be raised in the height adjustment direction.
- the MOSFETs S2 and S4 and S6 are conductive and the other MOSFETs are switched off. PWM signals are present at the MOSFETs S4 and S6.
- the MOSFET S2 is operated through. This means that depending on the clock frequency of the clocked fourth and sixth MOSFETs S4, S6, the effective voltage levels for the two
- FIG. 10 the direction of rotation of the drive motors 20, 20 'is reversed.
- the MOSFETs S1, S3 and S5 are turned on and the other MOSFETs block. PWM signals are present at MOSFETs S1 and S3.
- the MOSFET S5 is operated through. This does one
- the two simultaneous adjustment operations, retracting and starting up Extending and lowering the steering column are frequently used movement patterns, which are used for example with the easy entry or with the memory function of the easy entry.
- the opposite simultaneous movement of the steering column, which is not possible with the control, is only very rarely requested and can be implemented one after the other by adjusting the individual adjusting drives.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Control Of Multiple Motors (AREA)
- Steering Controls (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018128399.7A DE102018128399A1 (en) | 2018-11-13 | 2018-11-13 | Steering column for a steering system of a motor vehicle with a control unit for two adjustment drives |
PCT/EP2019/080941 WO2020099362A1 (en) | 2018-11-13 | 2019-11-12 | Steering column for a steering system of a motor vehicle comprising a control unit for two adjustment drives |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3880538A1 true EP3880538A1 (en) | 2021-09-22 |
Family
ID=68621231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19806120.2A Withdrawn EP3880538A1 (en) | 2018-11-13 | 2019-11-12 | Steering column for a steering system of a motor vehicle comprising a control unit for two adjustment drives |
Country Status (5)
Country | Link |
---|---|
US (1) | US11591001B2 (en) |
EP (1) | EP3880538A1 (en) |
CN (1) | CN112996712B (en) |
DE (1) | DE102018128399A1 (en) |
WO (1) | WO2020099362A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018122767A1 (en) * | 2018-09-17 | 2020-03-19 | Thyssenkrupp Ag | Steering column and steer-by-wire steering system |
DE102019116760B3 (en) * | 2019-06-21 | 2020-08-27 | Nidec Motors & Actuators (Germany) Gmbh | Method for uniform height adjustment of a steering column of a motor vehicle |
DE102020211625A1 (en) | 2020-09-16 | 2022-03-17 | Thyssenkrupp Ag | Steering column with tolerance compensation element |
DE102021117036A1 (en) | 2021-07-01 | 2023-01-05 | Brose Fahrzeugteile Se & Co. Kommanditgesellschaft, Bamberg | Drive arrangement for a flap of a motor vehicle |
DE102022118199A1 (en) * | 2022-07-21 | 2024-02-01 | Schaeffler Technologies AG & Co. KG | Adjustment unit of a steering column of a vehicle |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1034379C (en) * | 1993-03-10 | 1997-03-26 | 陈大可 | Automatic control device for point voltage in half-bridge power amplification power supply |
JP2000287477A (en) * | 1999-03-29 | 2000-10-13 | Mitsubishi Electric Corp | Motor drive |
JP4287565B2 (en) | 2000-02-14 | 2009-07-01 | 本田技研工業株式会社 | Rear wheel steering device |
US6765391B2 (en) * | 2002-10-22 | 2004-07-20 | Texas Instruments Incorporated | Low cost asic architecture for safety critical applications monitoring an applied stimulus |
DE10253007A1 (en) * | 2002-11-14 | 2004-05-27 | Robert Bosch Gmbh | Electronic control system for two-motor drive for road vehicle windscreen wipers has three half-bridges in parallel, with the motors connected between adjacent pairs of bridges |
JP5151128B2 (en) | 2006-11-30 | 2013-02-27 | 日本精工株式会社 | Electric steering device |
US8026678B2 (en) * | 2007-03-30 | 2011-09-27 | Brother Kogyo Kabushiki Kaisha | Motor control device |
JP5768999B2 (en) * | 2011-02-16 | 2015-08-26 | 株式会社ジェイテクト | Motor control device and vehicle steering device |
JP5772726B2 (en) * | 2012-05-31 | 2015-09-02 | 株式会社デンソー | Control unit for air conditioner |
WO2014199021A1 (en) * | 2013-06-12 | 2014-12-18 | Université De Valenciennes Et Du Hainaut-Cambrésis | Steering system for a vehicle |
DE102014101995A1 (en) | 2014-02-18 | 2015-01-29 | Thyssenkrupp Presta Ag | Steering column for a motor vehicle and spindle nut |
DE102015224602B4 (en) | 2015-12-08 | 2023-05-04 | Thyssenkrupp Ag | Steering column for a steer-by-wire steering device |
DE102017201131A1 (en) * | 2017-01-25 | 2018-07-26 | Zf Friedrichshafen Ag | Control of an electrical machine |
US11904960B2 (en) * | 2020-04-14 | 2024-02-20 | Hl Mando Corporation | Steering system and method for controlling the same |
-
2018
- 2018-11-13 DE DE102018128399.7A patent/DE102018128399A1/en active Pending
-
2019
- 2019-11-12 US US17/290,803 patent/US11591001B2/en active Active
- 2019-11-12 WO PCT/EP2019/080941 patent/WO2020099362A1/en unknown
- 2019-11-12 CN CN201980074329.3A patent/CN112996712B/en active Active
- 2019-11-12 EP EP19806120.2A patent/EP3880538A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2020099362A1 (en) | 2020-05-22 |
US11591001B2 (en) | 2023-02-28 |
CN112996712A (en) | 2021-06-18 |
DE102018128399A1 (en) | 2020-05-14 |
CN112996712B (en) | 2023-09-05 |
US20210403073A1 (en) | 2021-12-30 |
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