DE102017001119A1 - Device for reducing spurious vibrations - Google Patents

Abstract

The invention relates to a device (10) for reducing disturbing vibrations in a vehicle interior (2), comprising a vehicle flap (20), at least one actuator (30) and an evaluation and control unit (40), which is inserted in the vehicle flap (20). introduces initiatable force via the at least one actuator (30). According to the invention, the introduced force stimulates the vehicle flap (20) to oscillate, the induced vibrations of the vehicle flap (20) forming countervibrations against the interfering vibrations in the vehicle interior (2) which superimpose and thus reduce the interfering vibrations in the vehicle interior (2).

Description

The invention relates to a device for reducing spurious vibrations according to the preamble of claim 1.

Tailgate vehicles are known in numerous variations. The tailgates are each coupled to the vehicle structure via hinges, lock, seals and buffer elements. Different excitation situations, such as vibrations when driving on uneven or rough roads, Radunwucht, engine or Antriebsstranganregungen, etc., can act on the vehicles and lead to unwanted noise in the vehicle interiors. This is due, inter alia, vibrations of the body structure and / or chassis components and / or vehicle flaps. Current remedial measures can take in the complex mechanisms of action in the entire vehicle in different directions and range, for example, from a modified suspension bearing to reduce induced disturbing forces on stiffening of the body structure for changing interior acoustics relevant body styles to measures on the vehicle flaps, which for example a modified coupling to the body structure by means of a decoupling element can form on the closing wedge of the lap.

In addition, devices for reducing spurious oscillations are known in numerous variations. These devices can have at least one actuator and an evaluation and control unit. The actuator acts on a vehicle flap, wherein the evaluation and control unit adjusts a force which can be introduced into the vehicle flap via the at least one actuator. As a result, vibrations generated by the vehicle flap and the resulting noise in the vehicle interior can be reduced.

From the DE 10 2005 007 985 A1 a generic device for reducing spurious oscillations is known, which has at least one first piezoelectric element structure, which expands against a direction of vibration of a body part, wherein a defined counter-pulse or a defined counterforce is generated, which reduces the original amplitude of vibration of the body part. A second piezoelectric element structure is deformed by the vibration of the body part and thereby generates electrical energy, for example as an alternating voltage, which is supplied to the first piezoelectric element structure. In this case, the counter-pulse generated by the first piezoelectric element structure can be generated with a time delay. In order to determine the delay time, the device may comprise a microcomputer.

The invention is based on the object to provide a device for reducing disturbing vibrations in a vehicle interior, which can be easily adapted to the driving operation and to different vehicle models.

According to the invention, the object is achieved by providing a device for reducing disturbing vibrations in a vehicle interior having the features of patent claim 1. Advantageous embodiments and further developments of the invention are specified in the dependent claims.

In order to provide a device for reducing disturbing vibrations in a vehicle interior, which can be easily adapted to the driving operation as well as to different vehicle models, a force introduced by at least one actuator activates the vehicle flap to vibrate, wherein the induced vibrations of the vehicle flap against the disturbing vibrations in the vehicle interior Forming counter-oscillations, which superimpose the interference in the vehicle interior and thus reduce.

In the following, vibrations are understood to be frequencies and / or intensities or amplitudes which can be perceived in the vehicle interior as disturbing noises, for example in the form of a roar. These disturbing vibrations in the vehicle interior can result from vibrations of vehicle flaps and / or individual flap parts and / or parts of the body structure and / or chassis components. In this case, the vehicle flaps and / or the individual flap parts and / or parts of the body structure and / or the chassis components can be excited by environmental influences to oscillate.

The vehicle flap is understood in the following to mean an assembly which may comprise a main body, a flap bearing, flap locks, at least one flap hinge, at least one buffer element and at least one sealing element. In a preferred embodiment, the vehicle door corresponds to a tailgate whose base body can be excited to vibrate by the force introduced by at least one actuator.

An evaluation and control unit can introduce the force which can be introduced into the vehicle flap via the at least one actuator, for example as a function of at least one vibration-relevant one set physical size, which is detected by at least one sensor unit.

The evaluation and control unit can advantageously set the force introduced into the vehicle flap and thereby the induced vibrations of the vehicle flap dynamically as a function of the operating state of the vehicle and / or as a function of the environmental influences and / or as a function of the corresponding vehicle model. Ideally, the superimposition of the spurious vibrations with the countervibrations leads to extinguishing the spurious vibrations in the vehicle interior. However, it is also possible that the frequencies and / or intensities or amplitudes of the vibrations resulting from the superimposition can not be perceived by an occupant or can be perceived as less disturbing. This leads advantageously to the reduction or avoidance of corresponding noise in the vehicle interior and to a better driving feel and ride comfort. In addition, the force introduced by the at least one actuator can be adapted to a vehicle model or to the vehicle flap model, so that the device according to the invention can be used in various vehicle models. Since the device according to the invention can reduce the resulting disturbing vibrations in the vehicle interior resulting from complex action mechanisms, it is advantageously possible to make any design changes in the development phase on the vehicle and then reduce the disturbing vibrations in the vehicle interior resulting from the changes by embodiments of the device according to the invention. Furthermore, the device according to the invention comprises components and / or assemblies and / or components which are substantially already present in the vehicle. Furthermore, it is advantageously possible to dispense with additional insulation and / or damping measures and / or stiffening measures of the body structure. As a result, in addition to the reduction of the disturbing vibrations in the vehicle interior, a weight saving in the vehicle can additionally be achieved.

In an advantageous embodiment of the device according to the invention, the force introduced into the vehicle flap can be damped and / or reduced by oscillations of the vehicle flap causing spurious vibration components in the vehicle interior. Advantageously, the spurious vibrations can be reduced by the amount caused by the vehicle door. Thus, for example disturbing natural oscillations of the vehicle door can be counteracted by the introduced force and the natural vibrations are damped and / or reduced. If the cause of the noise in the vehicle interior lies exclusively in the vibrations of the vehicle door, by dampening or reducing these vibrations by the at least one actuator, the noise can be effectively reduced or completely suppressed. Otherwise, the noise in the vehicle interior can be reduced or completely suppressed by the counter vibrations induced by the actuator in the vehicle door.

In a further advantageous embodiment of the device according to the invention, the at least one actuator between a body and the vehicle door can be arranged. For example, the at least one actuator can be designed as an active buffer element and / or as an active seal. The active buffer element and / or the active seal may include elements which expand under electrical or magnetic influence or otherwise change their dimensions. As a result, existing buffer elements and / or seals can advantageously be used to introduce the force and thereby to induce the countervibration. For example, the frequencies of the countervibrations can be adjusted in a targeted manner by the application of alternating voltages to a piezoelectric structure in an active buffer element.

In a further advantageous embodiment of the device according to the invention, the at least one actuator can be integrated into the vehicle door. For example, the at least one actuator can be embodied as an inertial mass actuator, which comprises an electrodynamic or piezoelectric actuator. The inertial mass actuator can advantageously introduce forces into the vehicle flap in a targeted manner, so that advantageously the frequencies and / or intensities or amplitudes of the vibrations induced in the vehicle flap can be adjusted.

In a further advantageous embodiment of the device according to the invention, at least one sensor unit can detect at least one physical variable that is relevant to disturbing vibration and output corresponding sensor signals to the evaluation and control unit. In this case, the at least one physical variable that is relevant to disturbance oscillation may correspond to the amplitudes or frequencies of the spurious oscillations and / or represent the amplitudes or frequencies of the spurious oscillations. The evaluation and control unit can determine the required force, which is introduced into the vehicle flap, from the detected at least one physical quantity relevant to disturbance oscillation. The evaluation and control unit can output at least one control signal to the at least one actuator as a function of the sensor signals. For example, the evaluation and control unit can perform a simple control function, which can use at least one sensor signal as a controlled variable. Additionally or alternatively, the evaluation and control unit, for example, perform an adaptive filter function, which receives at least a first physical quantity as an input variable and / or at least a second physical variable as an optimization variable and generates and outputs at least one drive signal for the at least one actuator via at least one transfer function , Various basic transmission functions can be stored in a memory unit, which can be varied by the at least one currently detected optimization variable, so that the force introduced into the vehicle door can be dynamically adapted to vibrations generated by a current driving situation which can cause spurious vibration components in the vehicle interior. The basic transmission function can be determined, for example, as a function of the current vehicle model. The current driving situation is determined, for example, by a current driving speed and / or a current background and / or a current flow resistance and / or a wheel imbalance and / or engine or Antriebsstranganregungen.

In a further advantageous embodiment of the device according to the invention, a first sensor unit can detect a vertical wheel acceleration and / or an axle oscillation. Additionally or alternatively, a second sensor unit can detect a drive speed. Additionally or alternatively, a third sensor unit can detect a sound pressure or noises in the vehicle interior. In this case, the first sensor unit and the second sensor unit can advantageously detect signals or oscillations which correlate with excitation forces. The excitation forces can cause spurious vibration components in the vehicle interior and be used as an input variable for the adaptive filter function. The detected signals or vibrations can be caused for example by an uneven or rough road, a wheel imbalance and engine or Antriebsstranganregungen. The third sensor unit can determine the current spurious vibrations or the sound pressure in the vehicle interior, for example via a microphone. As a result, the required countervibrations can be generated by the evaluation and control unit via the at least one actuator, which are used for damping or reducing the disturbing vibrations acting in the vehicle interior. Preferably, the sensor signals of the third sensor unit can be used as an optimization variable for the adaptive filter. This allows the transfer function of the filter to be adjusted to minimize the size of the optimization. Thus, it can be advantageously checked whether the generated countervibrations have sufficiently damped and / or reduced the spurious oscillations. Due to the adaptive filter function, the spurious vibration components caused by the detected signals or vibrations can already be compensated for before they occur in the vehicle interior.

In a further advantageous embodiment of the device according to the invention, a fourth sensor unit can detect the resulting vibrations of the vehicle door, which are composed of the natural vibrations of the vehicle door and the induced vibrations. Advantageously, caused by the natural vibration of the vehicle door in the vehicle interior Störschingungsanteile or the natural vibrations of the vehicle door itself can be easily reduced by the introduced force. The sensor signal of the fourth sensor unit can be used, for example, as a further optimization variable for the adaptive filter function. Alternatively, the sensor signal of the third sensor unit and / or the sensor signal of the fourth sensor unit can be used directly as controlled variables of the control function.

Advantageously, the evaluation and control unit depending on the received sensor signals vary the force acting on the flap and thereby induced in the vehicle door vibrations. Furthermore, different transmission functions can be generated and stored for different vehicle models and / or valve models and / or drive models so that an optimum setting of the at least one actuator can be found and specified for each vehicle model and / or valve model and / or actuator model. By monitoring the noise or the spurious vibrations in the vehicle interior, the adaptive filter function of the evaluation and control unit can advantageously adjust the force and thus induced countervibrations in the vehicle door to different operating conditions or vehicle states to the detected noise and / or spurious to minimize.

The device according to the invention for reducing spurious oscillations can also be adapted to the final boundary condition via software in a late project phase. As a result, high hardware change costs can advantageously be avoided in a late project phase. In addition, an improved interior acoustics can be implemented. This allows new freedom in terms of package and thus design and weight, which can lead advantageously to the resolution of target conflicts in the development of vehicles.

• 1 eine schematische Seitenansicht eines Fahrzeugs mit einem Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung zur Reduzierung von Störschwingungen in einem Fahrzeuginnenraum.

An embodiment of the invention is illustrated in the drawing and will be explained in more detail in the following description. In the drawing, like reference numerals designate components that perform the same or analog functions. Hereby shows:

• 1 a schematic side view of a vehicle with an embodiment of a device according to the invention for reducing spurious vibrations in a vehicle interior.

How out 1 it can be seen has a vehicle 1 a device 10 for the reduction of disturbing vibrations in a vehicle interior 2 on. This device 10 includes a vehicle door 20 , at least one actor 30 and an evaluation and control unit 40 which one in the vehicle door 20 Introducing force on the at least one actuator 30 established.

According to the invention, the introduced force excites the vehicle flap 20 to vibrate, the induced vibrations of the vehicle door 20 against the disturbing vibrations in the vehicle interior 2 form acting counter vibrations, which are the disturbing vibrations in the vehicle interior 2 overlay and thus reduce.

By superimposing the disturbing vibrations in the vehicle interior 2 with adapted to the spurious oscillations counter vibrations, resulting from the superposition oscillation can arise, which has a non-audible frequency or a non-audible oscillation intensity or oscillation amplitude. This allows corresponding noise in the vehicle interior 2 reduced or completely avoided.

How out 1 is further apparent, is the vehicle door 20 executed in the illustrated embodiment as a tailgate. The at least one actor 30 can be between a body and the vehicle door 20 to be ordered. Here, the at least one between the vehicle door 20 and the body arranged actuator 30 be executed as an active buffer element or as an active seal. Additionally or alternatively, the at least one actuator 30 in the vehicle door 20 to get integrated. Here, the at least one in the vehicle door 20 integrated actuator 30 be performed as an inertial mass actuator, which comprises an electrodynamic or piezoelectric actuator. The device according to the invention 10 can only between the vehicle flap 20 and the body arranged actuators 30 or only in the vehicle door integrated actuators 30 or a combination of between the vehicle door 20 and the body arranged actuators 30 and in the vehicle door 20 integrated actuators 30 exhibit.

How out 1 is further apparent, detects at least one sensor unit 50 Harmonic relevant physical variables and are corresponding sensor signals S1 . S2 . S3 . S4 to the evaluation and control unit 40 out.

How out 1 can be further seen, gives the evaluation and control unit 40 depending on the sensor signals S1 . S2 . S3 . S4 control signals St to the at least one actuator 30 out.

In the illustrated embodiment, two first sensor units detect 51 in each case a vertical wheel acceleration and / or axle vibrations. A second sensor unit 52 detects a drive speed. A third sensor unit 53 detects a sound pressure or noise in the vehicle interior 2 , A fourth sensor unit 54 detects the resulting vibrations of the vehicle door 20 , Here is the first sensor unit 51 executed as a wheel acceleration sensor or has a Radbeschleunigungssensor. Through the first sensor unit 51 For example, a surface structure of the roadway or a wheel imbalance can be detected and evaluated as an environmental influence. For example, with an uneven or rough road surface or with a wheel imbalance, vibrations may occur over wheels of the vehicle 1 be transferred to the chassis components and / or the body structure. These vibrations cause parts of the body structure and / or the vehicle door 20 and / or suspension components to vibrate and cause Störschwingungsanteile and the resulting noise in the vehicle interior 2 passing through the third sensor unit 53 be recorded. The second sensor unit 52 has a speed sensor or is designed as a speed sensor, which can determine a current drive speed and a resulting resulting on the body structure drive vibrations. The drive vibrations can also lead to an excitation of parts of the vehicle body and / or the vehicle door and / or the chassis components and thereby to the generation of spurious vibration components and noise in the vehicle interior 2 contribute, which of the third sensor unit 53 be recorded. The third sensor unit 53 is running as a microphone or has a microphone. About this microphone or another acoustic sensor can current disturbing vibrations or noise in the vehicle interior 2 be recorded. This allows the evaluation and control unit 40 Check that the over the at least one actuator 30 in the vehicle door 20 introduced force the spurious or noise in the vehicle interior 2 reduced to a sufficient extent.

In the illustrated exemplary embodiment, the evaluation and control unit 40 performs an adaptive filter function which receives at least one first physical variable as input variable and / or at least one second physical variable as optimization variable and via at least one transfer function at least one activation signal St for the at least one actor 30 generates and outputs. In the illustrated embodiment, the sensor signals S1 the first two sensor units 51 and the sensor signals S2 the second sensor unit 52 used as input variables for the adaptive filter function. The sensor signals S3 the third sensor unit 53 are used as the optimization variable for the adaptive filter, which adjusts the transfer function of the filter to minimize the optimization size. As a result, it can be advantageously checked whether the generated countervibrations have sufficiently damped and / or reduced the spurious oscillations.

Alternatively, the sensor signals S3 the third sensor unit 53 also be used to determine the appropriate force. The fourth sensor unit 54 has a vibration sensor or is designed as a vibration sensor. In addition, the evaluation and control unit 40 execute in a non-illustrated embodiment, a simple control function, which the sensor signals S3 the third sensor unit 53 and / or the sensor signals S4 the fourth sensor unit 54 used as a controlled variable.

How out 1 can be further seen, are the sensor units 50 . 51 . 52 . 53 , 54 via a not-shown communication system, such as a data bus system with the evaluation and control unit 40 coupled.

In an alternative embodiment, not shown, the device according to the invention 10 only one of the mentioned sensor units 51 , 52, 53, 54, for example the third sensor unit 53 , or another combination of said sensor units 51 . 52 . 53 . 54 exhibit. In addition, the device according to the invention 10 further or alternative sensor units, such as a camera, which are suitable to detect an uneven or rough road surface directly.

Determines the evaluation and control unit 40 Disturbing vibrations and noise in the vehicle interior 2 , which mainly due to the vibrations of the vehicle door 20 be generated, then attenuates or reduces the in the vehicle door 20 about the at least one actor 30 initiated force the störschwingungsausbildenden share of the vibrations of the vehicle door 20 , This will be no further vibrations in the vehicle door 20 stimulated. Determines the evaluation and control unit 40 Disturbing vibrations and noise in the vehicle interior 2 which causes more or less than the current vibration of the vehicle door 20 have, then generated in the vehicle door 20 about the at least one actor 30 initiated force targeted, the counter vibrations form vibrations of the vehicle door 20 to the disturbing vibrations in the vehicle interior 2 to superimpose and thus reduce.

LIST OF REFERENCE NUMBERS

1

vehicle

2

Vehicle interior

10

contraption

20

vehicle flap

30

actuator

40

Evaluation and control unit

50

sensor unit

51

first sensor unit (wheel acceleration sensor)

52

second sensor unit (speed sensor)

53

third sensor unit (microphone)

54

fourth sensor unit (vibration sensor)

S1, S2, S3, S4

sensor signal

St

control signal

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 102005007985 A1 [0004]

Claims (12)

Device (10) for reducing disturbing vibrations in a vehicle interior (2), comprising a vehicle flap (20), at least one actuator (30) and an evaluation and control unit (40), which can be introduced into the vehicle flap (20) via the force adjusts at least one actuator (30), characterized in that the introduced force, the vehicle flap (20) to vibrate, wherein the induced vibrations of the vehicle door (20) against the disturbing vibrations in the vehicle interior (2) acting counter oscillations, which the disturbing vibrations in the vehicle interior (2) overlay and thus reduce. Device after Claim 1 Characterized in that in the vehicle door (20) force introduced by vibrations of the vehicle caused flap (20) Störschwingungsanteile in the vehicle interior (2) attenuates and / or reduced. Device after Claim 1 or 2 , characterized in that the at least one actuator (30) between a body and the vehicle door (20) is arranged. Device after Claim 3 , characterized in that the at least one actuator (30) is designed as an active buffer element and / or as an active seal. Device according to one of Claims 1 to 4 , characterized in that the at least one actuator (30) in the vehicle door (20) is integrated. Device after Claim 5 , characterized in that the at least one actuator (30) is designed as an inertial mass actuator. Device according to one of Claims 1 to 6 , characterized in that at least one sensor unit (50) detects at least one physical variable relevant to disturbing vibration and outputs corresponding sensor signals (S1, S2, S3, S4) to the evaluation and control unit (40). Device after Claim 7 , characterized in that the evaluation and control unit (40) in response to the sensor signals (S1, S2, S3, S4) at least one control signal (St) to the at least one actuator (30) outputs. Device after Claim 8 , characterized in that the evaluation and control unit (40) performs a control function which uses at least one sensor signal (S3, S4) as a control variable. Device according to one of Claims 7 to 9 , characterized in that the evaluation and control unit (40) carries out an adaptive filter function which receives at least a first sensor signal (S1, S2, S4) as an input variable and / or at least one second sensor signal (S3, S4) as an optimization variable and in dependence the sensor signals (S1, S2, S3, S4) at least one control signal (St) to the at least one actuator (30) outputs. Device according to one of Claims 7 to 10 , characterized in that a first sensor unit (51) detects a vertical wheel acceleration and / or axle vibration and / or a second sensor unit (52) a drive speed and / or a third sensor unit (53) a sound pressure in the vehicle interior (2). Device according to one of Claims 7 to 11 Characterized in that a fourth sensor unit (54) detects the resulting vibration of the vehicle door (20).

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