DE102017124244A1 - Actuator for influencing a rolling motion of a motor vehicle - Google Patents

Abstract

The invention relates to an actuator (1) for influencing a rolling movement of a motor vehicle, comprising two end regions (2, 3), between which a relative rotation about an axis (a) can be generated, wherein the two end regions (2, 3) with wheels (4, 5) of the motor vehicle are in operative connection, wherein the actuator (1) comprises a housing (6) in which a motor (7) and a motor (7) driven gear (8) is arranged, wherein the housing ( 6) is in a fixed rotational connection with one end region (2) and in which the transmission (8) is in a fixed rotational connection with the other end region (3), measuring means (9) for detecting the torque prevailing between the end regions (2, 3) ( M) are present. In order to be able to detect the torque prevailing between the end regions with little effort and therefore cost-effectively, the invention provides that the measuring means (9) have at least one passive electrical oscillating circuit (10), wherein the oscillating circuit (10) is formed as a function of Torque (M) to change its resonant frequency, and at least one evaluation unit (11), wherein the evaluation unit (11) comprises a coil (12) which is inductively coupled to the resonant circuit (10).

Description

Field of the invention

The invention relates to an actuator for influencing a rolling motion of a motor vehicle, comprising two end regions, between which a relative rotation about an axis can be generated, wherein the two end region are in operative connection with wheels of the motor vehicle, wherein the actuator has a housing in which a Motor and a motor-driven gear is arranged, wherein the housing is fixedly connected to one end portion in rotation and wherein the gearbox is in fixed rotational connection with the other end portion, wherein measuring means for detecting the torque prevailing between the end portions are present.

Background of the invention

A generic actuator is from the DE 10 2009 028 386 A1 known. It is used to accomplish roll stabilization of a motor vehicle. This is acted upon by adjusting means on the wheels of the vehicle to counteract a rolling motion. The rolling motion of the vehicle is detected by a corresponding sensor. Said actuator is a pivot drive, which is arranged between halves of a suspension stabilizer. Hereby, the rolling motion can be reduced or completely suppressed. Ultimately, this is done by applying one of the rolling motion opposing torque through the actuator.

Essential for a good result is that the torque generated by the actuator or torsional moment can be precisely met, as dictated by a corresponding control of the system. In the previously known solution, therefore, measuring means are already provided with which the torque generated by the actuator can be determined.

For the measurement, the inverse magnetoelastic technology is mostly used (magnetostrictive displacement transducer), which however has the disadvantage that it is relatively expensive and therefore causes corresponding costs. In addition, there are sometimes adverse mechanical entanglement in the contact. Finally, it is disadvantageous that in the case of over torques no particularly high robustness of the system is given.

Object of the invention

The present invention has for its object to provide a generic actuator so that the mentioned disadvantages can be avoided. Accordingly, the torque prevailing between the end regions of the actuator can be detected with little effort and thus cost.

Summary of the invention

The solution of this object by the invention is characterized in that the measuring means comprise at least one passive electrical resonant circuit, wherein the resonant circuit is formed to change its resonance frequency as a function of the torque, and at least one evaluation unit, wherein the evaluation unit comprises a coil, the is inductively coupled to the resonant circuit.

The passive electrical resonant circuit is preferably arranged as a multilayer coating in an inner region of the housing.

The passive electrical resonant circuit is arranged according to a preferred embodiment of the invention in a radially extending portion of the housing; the radially extending portion may be a flange or a flange portion of the housing.

Alternatively, it is also possible that the passive electrical resonant circuit is arranged in a cylindrical portion of the housing.

The said coating can be arranged directly on the material of the housing. However, it is also possible that the coating is arranged on a carrier material which is mounted on the material of the housing.

The evaluation unit can have an analog-to-digital converter with which the signals measured by the coil can be converted into digital information.

Furthermore, contact means may be present with which a contact between the resonant circuit and the evaluation unit can be ensured. In the contact means are in particular spring means.

With the present invention, the integration of a torque sensor into an actuator of a roll stabilizer can be carried out in an effective manner.

For measuring the torque, the above-mentioned technology is used, which is known as such and in the DE 10 2013 215 320 A1 the patent applicant is described in detail. This document is therefore expressly incorporated by reference.

The basic concept of this technology is that a component which is subject to deformation (as in the present case, the housing which transmits the torque) carries said resonant circuit, wherein the deformations to changes in the electrical quantities (inductances, capacitances or resistances) of the resonant circuit, which changes its resonant frequency. By determining said frequency by said measurement can then be deduced precisely on the component load and in this case on the torque.

The structure required for the measurement is applied to the inner end face of a flange-shaped portion of the housing or to the inside of the housing, which can be done directly or via a carrier substrate.

The signal of the measuring structure (measuring bridge) can be further processed digitally, for which a sensor with a digital signal output is used and the signal preprocessing takes place on a local sensor electronics. For this purpose, the required electronics are applied locally (for example, on said flange or on the carrier substrate), which comprises an analog-to-digital converter for the bridge signals and allows the digital transmission of the bridge signals via a secure channel for further use in the controller, which covers the entire Roll stabilization process controls or regulates.

But it is also possible an analog processing of the signals, namely, when a sensor with analog signal output is used.

The measuring structure can be contacted via tolerance compensating contacting elements (for example via spring contact elements) in order to reliably transmit the bridge signals, which is advantageous in particular in analog signal processing.

The A / D conversion and further signal processing can be done on a remote electronics.

list of figures

• 1 schematisch in der Seitenansicht einen Aktuator zur Beeinflussung einer Wankbewegung eines Kraftfahrzeugs und
• 2 schematisch eine vergrößerte Darstellung eines Ausschnitts von 1, nämlich des linken oberen Bereichs.

In the figures, an embodiment of the invention is shown. Show it:

• 1 schematically in side view an actuator for influencing a rolling motion of a motor vehicle and
• 2 schematically an enlarged view of a section of 1 namely the upper left area.

Detailed description of the figures

In 1 is an actuator 1 shown schematically, for generating a torque M serves, with which the roll behavior of a motor vehicle can be influenced. The two end areas 2 and 3 of the actuator 1 are each with a bike 4 or. 5 connected to the motor vehicle, the wheels 4 . 5 are only indicated. Details of the structure of a system for influencing the roll behavior of a motor vehicle are in the DE 10 2009 028 386 A1 to which reference is expressly made. In that regard, further explanations on the basic structure of such a system are unnecessary at this point.

The actuator 1 has a housing 6 in which a motor 7 (Electric motor) is arranged. The actuator 1 extends along an axis a , The motor 7 is non-rotatable in the housing 6 arranged and drives with its drive shaft a (only very schematically illustrated) gearbox 8th on, which is formed in the embodiment as a multi-stage planetary gear. While one side (namely the left side) of the housing 6 non-rotatable with the end area 2 connected, drives the transmission 8th (namely in the right area in 1 ) the end area 3 on, so that upon actuation of the electric motor 7 between the two end areas 2 and 3 a torque M can be built, which then on the wheels 4 . 5 acts.

The two end areas 2 and 3 are each in camps 17 and 18 stored, causing the wheels 4 . 5 the desired influence can be taken, which determines the roll behavior of the vehicle.

So that the torque can be generated to a well-defined extent, are measuring means 9 for detecting the torque M intended.

The measuring equipment 9 comprise at least one passive electrical resonant circuit 10 , This is formed, depending on the torque M to change its resonant frequency.

Furthermore, the measuring means comprise 9 at least one evaluation unit 11 , The evaluation unit 11 has a coil 12 that with the resonant circuit 10 is inductively coupled. A more detailed account of this is in 2 played.

Here it can be seen that the passive electrical resonant circuit 10 a coil 19 , a capacity 20 (Capacitor) and a resistor 21 having these components directly inside the housing 6 and here at a radially extending portion 13 are arranged. to in this detail design is explicitly on the DE 10 2013 215 320 A1 the applicant referred. Here is explained that the mentioned components 19 . 20 . 21 are formed as layers on the substrate, in this case on the section 13 , are applied. Deformed the housing 6 and therefore also the section 13 due to the effective torque M , there is a change in the electrical quantities of said components, which is indicated by the arrows in the components 19 . 20 and 21 in 2 is indicated.

The evaluation unit 11 includes the coil 12 , which is an electrical coupling to the resonant circuit 10 allowed and thus via an evaluator 23 and a signal generator 22 can capture how the electrical quantities of the components 19 . 20 and 21 due to the torque to pass the measured values to an unillustrated control device, which performs the roll stabilization management.

This can also be the rotational movement of the engine 7 with a rotary position sensor 16 be recorded.

In 1 is still hinted that over a contact means 15 in the form of a spring one in the direction of the axis a acting contact pressure can be generated, with a support element 25 , which is the evaluation unit 11 carries, to the resonant circuit 10 can be pressed to ensure reliable data acquisition.

In general it is also possible to use the resonant circuit 10 instead of in the radially extending, flange-shaped section 13 inside the cylindrical section 14 of the housing 6 to place.

LIST OF REFERENCE NUMBERS

1

actuator

2

end

3

end

4

wheel

5

wheel

6

casing

7

engine

8th

transmission

9

Measuring means for detecting the torque

10

passive electrical resonant circuit

11

evaluation

12

Coil of the evaluation unit

13

radially extending section (flange)

14

cylindrical section

15

Contact agent (spring agent)

16

Rotary position sensors

17

warehouse

18

warehouse

19

Coil of the resonant circuit

20

Capacity of the resonant circuit

21

Resistance of the resonant circuit

22

signal generator

23

evaluator

24

drive shaft

25

support element

a

axis

M

torque

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102009028386 A1 [0002, 0022]
• DE 102013215320 A1 [0014, 0028]

Claims (10)

Actuator (1) for influencing a rolling movement of a motor vehicle, comprising two end regions (2, 3), between which a relative rotation about an axis (a) can be generated, wherein the two end regions (2, 3) are provided with wheels (4, 5 ) of the motor vehicle are in operative connection, wherein the actuator (1) has a housing (6) in which a motor (7) and a motor (7) driven gear (8) is arranged, wherein the housing (6) with a End region (2) is in a fixed rotational connection and wherein the transmission (8) with the other end portion (3) in a fixed rotational connection, wherein measuring means (9) for detecting the between the end regions (2, 3) prevailing torque (M) are present , characterized in that the measuring means (9) have at least one passive electrical oscillating circuit (10), wherein the oscillating circuit (10) is designed to change its resonance frequency as a function of the torque (M) and have at least one evaluation unit (11), where d The evaluation unit (11) comprises a coil (12), which is inductively coupled to the resonant circuit (10). Actuator after Claim 1 , characterized in that the passive electrical resonant circuit (10) is arranged as a multilayer coating in an inner region of the housing (6). Actuator after Claim 2 , characterized in that the passive electrical oscillation circuit (10) is arranged in a radially extending portion (13) of the housing (6). Actuator after Claim 3 characterized in that the radially extending portion (13) is a flange or flange portion of the housing (6). Actuator after Claim 2 , characterized in that the passive electrical oscillation circuit (10) in a cylindrical portion (14) of the housing (6) is arranged. Actuator after one of Claims 2 to 5 , characterized in that the coating is arranged directly on the material of the housing (6). Actuator after one of Claims 2 to 5 , characterized in that the coating is arranged on a carrier material which is mounted on the material of the housing (6). Actuator after one of Claims 1 to 7 , characterized in that the evaluation unit (11) comprises an analog-to-digital converter, with which the signals measured by the coil (12) can be converted into digital information. Actuator after one of Claims 1 to 8th , characterized in that contact means (15) are provided with which a contact between the resonant circuit (10) and the evaluation unit (11) can be ensured. Actuator after Claim 9 , characterized in that the contact means (15) are designed as spring means.

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