Device for noise optimization and method for operating a device for noise optimization

Abstract

Device (1) for noise optimization of a noise for generating a noise in the vehicle interior for conveying an enhanced drive sound of a drive (2) for a vehicle with an electric motor or a hybrid drive with an internal combustion engine and an electric motor as drive (2) and a drive train downstream of the drive (2), wherein elements of the drive train are mounted on the body (5) by means of bearing elements (4, 25, 26, 27, 28, 29, 30, 31, 34, 53, 54, 55), wherein at least one bearing element (4, 27, 28, 29, 30, 31, 54, 55) has an actuator as a vibration generator (6) which can be controlled by a control unit, wherein the at least one bearing element (4, 27, 28, 29, 30, 31, 54, 55) is a bearing element of a transmission bearing, a Torque support, differential bearing, rear axle gearbox bearing and / or cardan shaft bearing, such as a cardan shaft center bearing, is,wherein the actuator is controlled as a vibration generator (6) such that it generates vibrations whose frequencies are superimposed on the order spectrum of the drive noise, wherein vibrations correspond to at least one order of the drive noise that is weak or not pronounced in the drive noise, wherein the vibration orders fill in or reinforce orders of the drive noise that are weak or not pronounced, and wherein the actuator is a hydraulic actuator.

Description

[0001] The invention relates to a device for noise optimization, particularly in the vehicle interior, especially for a vehicle with an internal combustion engine and / or an electric motor as a drive, according to the preamble of claim 1. The invention also relates to a method for operating such a device.

[0002] Motor vehicles with combustion engines and / or electric motors, i.e., vehicles with only a combustion engine, only an electric motor, or a hybrid drive with both a combustion engine and an electric motor, generate a drive noise that is typical for the respective drive system or drive concept. This noise is transmitted from the drive system into the passenger compartment of the vehicle, with a first transmission path occurring via airborne sound or airborne sound paths and a second transmission path occurring via structure-borne sound paths or through the vehicle body.

[0003] The engine noise is further altered by so-called "downsizing," i.e., reducing the displacement of the combustion engine, for example by reducing the number of cylinders or temporarily deactivating cylinders, as well as by using alternative drive concepts with electric motors or hybrid drives with a combustion engine and an electric motor, resulting in a rather nonspecific engine noise. With such engine noise, the driver misses the acoustic feedback from the vehicle via the engine noise, so that during acceleration, these processes are also perceptible as such through an audible experience.

[0004] German patent DE 10 2004 044 513 A1 discloses a device for shaping interior noise, in which vibration generators are mounted in or on an engine mount and are controlled by a control unit to generate a sound pattern corresponding to the vehicle's operating parameters. For this purpose, the engine speed, engine load, and transmission gear are determined, and a noise excitation corresponding to these parameters is generated.

[0005] Controllable bearing elements have also become known through DE 102 33 783 B4.

[0006] US Patent 5841876 A shows a vehicle with an internal combustion engine and a device for noise optimization in a vehicle interior, wherein an engine mounting element has an actuator.

[0007] EP 0 479 367 A2 shows a vehicle with a noise reduction device with a loudspeaker located between an engine and a mounting frame.

[0008] DE 10 2005 012 463 B3 discloses methods for supplementing the engine noise of a motor vehicle with an additional noise generated by means of an actuator.

[0009] US Patent 5386372 A shows a vehicle with an internal combustion engine and a device for noise optimization in a vehicle interior.

[0010] DE 10 2004 062 471 B3 discloses a method for eliminating vibrations of an internal combustion engine in a motor vehicle.

[0011] DE 195 31402 C2 discloses a device for influencing vibrations in a passenger compartment of a motor vehicle.

[0012] However, this has the disadvantage that the engine-specific characteristics are not sufficiently taken into account, so that the noise generated in the passenger compartment is still sometimes perceived as rather artificial.

[0013] Therefore, the object of the present invention is to provide a device for noise optimization which is simple in design and generates noises in the passenger compartment that convey an enhanced engine sound. It is also an object of the invention to provide a corresponding method by which an enhanced engine sound can be generated.

[0014] The problem is solved using the features of claims 1 and 8.

[0015] One embodiment of the invention relates to a device for optimizing noise in the vehicle interior to convey an enhanced drive sound, wherein the drivetrain elements are mounted on the body by means of bearing elements, wherein at least one bearing element has an actuator as a vibration generator which can be controlled by a control unit, wherein the actuator as vibration generator is controlled such that it generates vibrations whose frequencies are superimposed on the order spectrum of the drive noise. This advantageously achieves a sound quality in the vehicle interior that corresponds to the behavior of the vehicle in the respective driving situation.

[0016] According to the invention, at least one bearing element is a bearing element of an engine mount, a transmission mount, a torque support, a differential mount, a rear axle transmission mount, and / or a driveshaft mount, such as a driveshaft center bearing. Depending on the design of the vehicle and the components and their arrangement, this allows for the generation of sound or vibration that meets the expectations for the interior sound. By selectively exciting vibrations at different points or component locations of the drivetrain, specific vibration excitation can be achieved depending on the transmission path of the vibrations.

[0017] It is advantageous if the actuator is integrated into the bearing element, acts on the bearing element, or is arranged adjacent to the bearing element. This allows for individual control of vibrations through targeted arrangement or integration of the actuator(s).

[0018] Furthermore, it is advantageous if a bearing element with actuator is arranged at a specific bearing position of the aggregate bearings.

[0019] It is also advantageous to arrange a defined number of bearing elements with actuators at specific bearing positions within the engine mounts. This allows for an individual arrangement of actuators as vibration generators, depending on the vehicle and powertrain. It is particularly beneficial if the actuators are controlled according to their arrangement to achieve vibration control appropriate to the transmission path. For example, when vibrations are excited at the engine mount, the second engine order can preferably be excited, while in the area of ​​the transmission mount, the transmission is particularly transparent to the fourth engine order and transmits these frequencies effectively.

[0020] It is also in accordance with the invention if the vibrations, in particular as sinusoidal vibrations, correspond to at least one order of the drive noise that is not very pronounced or is not pronounced in the drive noise.

[0021] It is also in accordance with the invention if the vibration orders fill in or amplify orders of the drive noise that are only slightly or not at all pronounced.

[0022] It is also in accordance with the invention if the actuator is a vehicle hydraulic actuator.

[0023] Furthermore, it is advantageous if the transmission of vibrations from the bearing element with actuator of the engine mount and / or from the actuator itself, via the drive, via an optional torque support of the drive, a steering gear and a steering column, from the drive via the engine mount elements with actuator to a subframe and from there to a front section of the vehicle body, from the bearing element of the engine mount element with actuator to a subframe and from there to a front section of the vehicle body and / or from a front section into the passenger compartment of the vehicle.

[0024] It is advantageous if the transmission of vibrations from the bearing element with actuator and / or from the actuator itself takes place via an engine mount, a transmission mount, a torque support, a differential mount, a rear axle transmission mount and / or a cardan shaft mount, such as a cardan shaft center bearing, via a structure-borne sound path to the body and from there into the vehicle interior.

[0025] One embodiment of the invention relates to a method for operating a device for noise optimization of a noise, particularly in the vehicle interior, especially for a vehicle with an internal combustion engine and / or with an electric motor as a drive and a drive train downstream of the drive, wherein the drive and / or elements of the drive train are mounted on the body by means of bearing elements, wherein at least one bearing element has an actuator as a vibration generator which can be controlled by a control unit, wherein the actuator as a vibration generator is controlled in such a way that it generates vibrations whose frequencies are superimposed on the order spectrum of the drive noise.

[0026] It is advantageous if at least one bearing element is a bearing element of an engine mount, a transmission mount, a torque support, a differential mount, a rear axle transmission mount and / or a cardan shaft mount, such as a cardan shaft center bearing.

[0027] It is also advantageous if bearing elements with actuators are arranged in different structure-borne sound transmission paths, whereby the actuators of different structure-borne sound transmission paths are controlled individually.

[0028] Furthermore, it is advantageous if the bearing element of a structure-borne sound transmission path is controlled according to the transmission behavior of the transmission path.

[0029] The invention will now be explained in detail using an exemplary embodiment and with reference to the drawing. The drawing shows: Fig. 1 a schematic representation of a device according to the invention, Fig. 2 a schematic representation of a device according to the invention in an installation situation in the vehicle, Fig. 3 a representation of the Fig. 2 from the bottom, Fig. 4 a motor vehicle with an arrangement of bearing elements, and Fig. 5 a motor vehicle with an arrangement of bearing elements.

[0030] The Fig. Figure 1 shows a bottom view of a device 1 for noise optimization, wherein the device 1 serves to optimize the noise of an internal combustion engine as a drive 2 in a vehicle 3. The internal combustion engine as drive 2 is mounted in the vehicle body 5 by means of engine mounting elements 4, so that it is contained within the body 5. At least one engine mounting element 4 is assigned an actuator as a vibration generator 6, which generates vibrations and can transmit them directly to the body 5 via the engine mounting element or to the body 5 via the drive 2.

[0031] The drive system is illustrated by way of example as an internal combustion engine. According to the invention, an electric motor or a hybrid drive system with an internal combustion engine and an electric motor is provided.

[0032] The actuator as vibration generator 6 is either integrated into the motor bearing element 4 or attached to the motor bearing element 4 or arranged adjacent to the motor bearing element 4.

[0033] The actuator, acting as a vibration generator 6, can be controlled via a control unit 7, which receives signals for processing. These signals can be received, for example, from other control units or from sensors 8, in order to appropriately control the vibration generator 6. Signals can also be received as CAN signals via the CAN bus. Advantageously, CAN signals are used that represent a measure of the respective driving situation and / or driving condition. These include, for example, the engine load, engine speed, gear position, clutch slip, and / or the position of a driving mode switch. The control unit can also receive a high-resolution speed signal from the crankshaft sensor. The more signals the control unit receives, the more authentic the sound can be.

[0034] According to the invention, the control unit 7 controls the vibration generator 6 such that it generates vibrations whose frequency corresponds to an order of the vibration of the drive 2. Preferably, sinusoidal vibrations are excited, wherein, in an advantageous embodiment, the frequency of the sinusoidal vibrations corresponds at least to an order of the drive vibrations or the drive noise, which is either pronounced or not pronounced in the drive noise or the drive vibrations.

[0035] In an alternative design, the vibration of the vibration generator 6 can also be antiphase.

[0036] The Fig. Figure 1 shows the engine mounting element 4, in which the actuator is incorporated as a vibration generator 6 in the housing. The engine mounting element 4 is preferably designed with a bearing element, such as a hydraulic mount, wherein the actuator of the vibration generator 6 generates the vibration excitation within the engine mounting element.

[0037] It is advantageous if the actuator of the vibration generator 6 is an electromagnetic actuator that can be controlled by the control unit 7. Alternatively, the actuator can also be an electric, electrodynamic, piezoelectric, pneumatic and / or, according to the invention, a hydraulic actuator.

[0038] The Fig. Figure 2 shows the arrangement of an internal combustion engine as a drive 2 in a front section 10 of the vehicle body 5. Two engine mounting elements 4 with an actuator as a vibration generator 6 are provided, which are arranged in the front area of ​​the vehicle between the drive 2 and a subframe 12. The subframe 12 supports the engine mounting element 4, which in turn supports the drive 2. For this purpose, the subframe 12 has eyelets into which projections of the engine mounting element 4 can be received, as shown in Figure 2. Fig. Figure 1 shows the transmission paths of sound or vibrations from the engine mount element 4. These paths occur either from the engine mount element 4 via the subframe 12 to the front section 10 of the vehicle body and are transmitted from there via other body components into the vehicle interior. Alternatively, the vibration can also be introduced directly from the engine mount element 4 into the front section 10 via the drive system, or directly into the vehicle interior from the drive system via a steering gear and steering column.

[0039] The Fig. Figure 3 shows the representation of the Fig. 2 from below, wherein an internal combustion engine as drive 2 is arranged in a subframe 12 and supported by the engine mounting elements 4. The engine mounting elements 4 are in turn held by the subframe 12 and support the drive 2. The subframe 12 is attached from below to the struts 13 of the front section 10 of the body, advantageously by bolting. The transmission of the vibration can therefore be introduced directly into the body via the subframe 12 to the front section or introduced into the body via the drive 2, so that the vibrations are transmitted along the same transmission path as the vibrations that originate directly from the drive 2.

[0040] The Fig. Figure 4 shows a schematic representation of a motor vehicle 20 with a drive motor 21, a gearbox 22, a cardan shaft 23 to a rear axle gearbox 24.

[0041] The respective assemblies are provided with bearing elements 25, 26, 27, 28, 29, 30, 31 for mounting in the body 32. Bearing elements 25 and 26 are designed as engine mounting elements, which support the drive motor 21. Furthermore, a torque support 33 is provided on the drive motor 21, which is also mounted to the body by means of a bearing element 34.

[0042] Bearing element 27 supports the transmission in the body 32. Bearing element 28 supports the cardan shaft 23 in the body 32. Bearing elements 29, 30 and 31 support the rear axle transmission 24 in the body 32.

[0043] According to the invention, it is advantageous if at least one of the bearing points is provided with an actuator to excite vibrations.

[0044] It is advantageous if vibrations are excited at at least one engine mount 25, 26 and at one transmission mount 27, whereby the vibration frequency of the excitation can be quite different. Thus, vibrations of the 2nd engine order can be excited at the engine mount, while vibrations with frequencies of the 4th engine order are driven in the area of ​​the transmission mount 27, because the transmission mount is essentially transparent to these frequencies and transmits them well.

[0045] The Fig. Figure 5 shows a further schematic representation of a motor vehicle 50 with a drive motor 51 and with a transmission 52.

[0046] The respective assemblies 51, 52 are provided with bearing elements 53, 54, 55 for mounting in the body 32. The bearing element(s) 53 are designed as engine mounting elements, which support the drive motor 51. Furthermore, a torque support is provided on the drive motor 51, which is also mounted to the body by means of a bearing element, however, this is in Fig. 5 is not recognizable.

[0047] The bearing elements 54, 55 support the transmission 52 in the body. According to the invention, it is also advantageous if at least one of the bearing points is provided with an actuator to excite vibrations. It is equally advantageous if vibrations are excited at at least one engine mount 53 and at at least one transmission mount 54, 55, whereby the vibration frequency of the excitation can be quite different. Thus, vibrations of the second engine order can be excited at the engine mount 53, while vibrations with frequencies of the fourth engine order are triggered in the area of ​​the transmission mount 54, 55.

Claims

[1] Device (1) for noise optimization of a noise for generating a noise in the vehicle interior for imparting an enhanced drive sound of a drive (2) for a vehicle with an electric motor or a hybrid drive with an internal combustion engine and an electric motor as drive (2) and a drive train arranged downstream of the drive (2), wherein elements of the drive train are mounted on the body (5) by means of bearing elements (4, 25, 26, 27, 28, 29, 30, 31, 34, 53, 54, 55), wherein at least one bearing element (4, 27, 28, 29, 30, 31, 54, 55) has an actuator as a vibration generator (6), which can be controlled by a control unit, wherein the at least one bearing element (4, 27, 28, 29, 30, 31, 54, 55) is a bearing element of a Gearbox bearing, a torque support, a differential bearing, a rear axle transmission bearing and / or a cardan shaft bearing, such as a cardan shaft center bearing,wherein the actuator is controlled as a vibration generator (6) in such a way that it generates vibrations whose frequencies are superimposed on the order spectrum of the drive noise, wherein vibrations correspond to at least one order of the drive noise which is little or not pronounced in the drive noise, wherein the vibration orders fill in or amplify orders of the drive noise which are only little or not pronounced, and wherein the actuator is a hydraulic actuator. [2] Device according to claim 1, characterized byin that the drive (2) is also mounted on the body (5) by means of bearing elements (4, 25, 26, 53), wherein at least one further bearing element (4, 25, 26, 53) is a bearing element of an engine mount, wherein the at least one further bearing element (4, 25, 26, 53) of the drive (2) has an actuator as a vibration generator (6) which can be controlled by a control unit, wherein the actuator as a vibration generator (6) is controlled in such a way that it generates vibrations whose frequencies are superimposed on the order spectrum of the drive noise. [3] Device according to claim 1 or 2, characterized by that the actuator is integrated into the bearing element (4, 25, 26, 27, 28, 29, 30, 31, 34, 53, 54, 55), the actuator engages the bearing element (4, 25, 26, 27, 28, 29, 30, 31, 34, 53, 54, 55) or is arranged adjacent to the bearing element (4, 25, 26, 27, 28, 29, 30, 31, 34, 53, 54, 55). [4] Device according to at least one of the preceding claims, characterized by that the bearing element (4, 25, 26, 27, 28, 29, 30, 31, 34, 53, 54, 55) with actuator is arranged at a specific bearing position of the unit bearings. [5] Device according to at least one of the preceding claims, characterized by that a defined number of bearing elements (4, 25, 26, 27, 28, 29, 30, 31, 34, 53, 54, 55) with actuator are arranged at specific bearing positions of the unit bearings. [6] Device according to one of claims 2 to 5, characterized bythat the transmission of the vibrations takes place from the further bearing element (4, 25, 26, 53) with actuator of the engine mount and / or from the actuator, via the drive (2), via an optional torque support of the drive (2), a steering gear and a steering column, from the drive (2) via the engine mount elements with actuator to a subframe and from there to a front end of the body of the vehicle, from the bearing element of the engine mount element with actuator to a subframe and from there to a front end of the body and / or from a front end into the passenger compartment of the vehicle. [7] Device according to one of claims 2 to 6, characterized bythat the transmission of the vibrations from the bearing element (4, 25, 26, 27, 28, 29, 30, 31, 34, 53, 54, 55) with actuator and / or from the actuator takes place via an engine mount, a gearbox mount, a torque support, a differential mount, a rear axle transmission mount and / or a cardan shaft mount, such as a cardan shaft center mount, via a structure-borne sound path to the body and from there into the vehicle interior. [8] Method for operating a device (1) for noise optimization of a noise for generating a noise in the vehicle interior for imparting an enhanced drive sound of a drive (2) for a vehicle with an electric motor or a hybrid drive with an internal combustion engine and an electric motor as the drive (2) and a drive train arranged downstream of the drive (2), wherein elements of the drive train are mounted on the body (5) by means of bearing elements (4, 25, 26, 27, 28, 29, 30, 31, 34, 53, 54, 55), wherein at least one bearing element (4, 27, 28, 29, 30, 31, 54, 55) has an actuator as a vibration generator (6), which can be controlled by a control unit, wherein the at least one bearing element (4, 27, 28, 29, 30, 31, 54, 55) a bearing element of a gearbox bearing, a torque support, a differential bearing, a rear axle transmission bearing and / or a cardan shaft bearing, such as a cardan shaft center bearing,wherein the actuator is controlled as a vibration generator (6) in such a way that it generates vibrations whose frequencies are superimposed on the order spectrum of the drive noise, wherein vibrations correspond to at least one order of the drive noise which is little or not pronounced in the drive noise, wherein the vibration orders fill in or amplify orders of the drive noise which are only little or not pronounced, and wherein the actuator is a hydraulic actuator. [9] Method according to claim 8, characterized byin that the drive (2) is also mounted on the body (5) by means of bearing elements (4, 25, 26, 53), wherein the at least one further bearing element (4, 25, 26, 53) is a bearing element of an engine mount, wherein the at least one further bearing element (4, 25, 26, 53) has an actuator as a vibration generator (6) which can be controlled by a control unit, wherein the actuator as a vibration generator (6) is controlled in such a way that it generates vibrations whose frequencies are superimposed on the order spectrum of the drive noise. [10] Method according to claim 8 or 9, characterized by that bearing elements (4, 25, 26, 27, 28, 29, 30, 31, 34, 53, 54, 55) with actuator are arranged in different structure-borne sound transmission paths, wherein the actuators of different structure-borne sound transmission paths are controlled individually. [11] Method according to claim 10, characterized bythat the bearing element (4, 25, 26, 27, 28, 29, 30, 31, 34, 53, 54, 55) of a structure-borne sound transmission path is controlled according to the transmission behavior of the transmission path.

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