motor vehicle

Abstract

Motor vehicle (1, 12, 17) with an interior floor (3) defining a passenger compartment (2) of the motor vehicle (1, 12, 17) on the floor side, at least one electrical energy storage device (4) arranged at least partially on the floor side below at least one section of the interior floor (3), and at least one low-frequency loudspeaker (8, 15, 21) arranged at least partially in the passenger compartment (2), wherein at least one cavity (11) is provided between the interior floor (3) and the electrical energy storage device (4), characterized in that the low-frequency loudspeaker (8, 15, 21) is arranged on at least one opening (18) of the interior floor (3) communicating with the cavity (11) such that the cavity (11) forms a resonance chamber for the low-frequency loudspeaker (8, 15, 21), wherein the opening (18) is on a dome-shaped projection pointing towards the passenger compartment (2). (13, 19) of the interior floor (3) is arranged.

Description

[0001] The invention relates to a motor vehicle with an interior floor that defines the passenger compartment of the motor vehicle on the floor side, at least one electrical energy storage device arranged at least partially on the floor side below at least one section of the interior floor, and at least one low-frequency loudspeaker arranged at least partially in the passenger compartment, wherein at least one cavity is present between the interior floor and the electrical energy storage device.

[0002] A motor vehicle comprises a passenger compartment, also called a passenger cell, which is bounded on the floor by an interior floor. An electrically powered motor vehicle, in particular an electric vehicle or a hybrid electric vehicle, comprises at least one electrical energy storage device, also called a traction battery, with which the electric drive devices, in particular electric motors, of the motor vehicle can be supplied with electrical energy. It is known to design the electrical energy storage device as a flat unit and to arrange the flat energy storage device on the floor below at least one section of the interior floor. Typically, the electrical energy storage device is arranged at a distance from the interior floor, so that at least one cavity exists between the interior floor and the electrical energy storage device.

[0003] A motor vehicle can conventionally be equipped with an audio system, in particular a stereo system, which includes at least one low-frequency loudspeaker capable of reproducing frequencies in a range of, for example, 40 Hz to 400 Hz. To create a subwoofer, for example, with a low-frequency loudspeaker, the loudspeaker must be combined with an open or closed resonance chamber, also called a resonance volume. For example, DE 197 35 082 A1 discloses an arrangement of a low-frequency loudspeaker under a vehicle seat, wherein the resonance volume of the loudspeaker is at least partially formed by the sill volume enclosed by a supporting frame. The sill volume and the rear of the loudspeaker are connected to each other via a through-opening. The sill volume is connected to the environment via diffusion openings.

[0004] It can be assumed that future vehicle architectures will not provide a sufficiently large sill volume, which precludes the arrangement of a low-frequency loudspeaker according to DE 197 35 082 A1. With regard to the steady demand for electromobility and electrically powered vehicles, and the associated integration of electrical energy storage systems, particularly high-voltage batteries, into vehicle floors, it can be assumed that potential resonance chambers within a vehicle's support structure will become increasingly smaller and thus too small to accommodate the resonance chamber required for a low-frequency loudspeaker. Furthermore, to reduce weight and achieve lightweight vehicle construction, vehicle support structures are being modified to be thinner, which in turn impairs the rigidity of the vehicle body.In order to still provide sufficient rigidity for the vehicle structure, existing cavities are stiffened with connecting elements running through the cavities, which further reduces the volumes of the cavities and thus also makes them too small to form a required resonance chamber.

[0005] German patent DE 20004023 U1 discloses a loudspeaker system for motor vehicles in which a loudspeaker is located in the spare wheel well of the vehicle. US patents 2010074453 A1, US 2006291687 A1, WO2004056612 A1, US 2015163573 A1, EP 0974489 A1, US 2008268793 A1 and CA 2284678 A1 disclose further loudspeaker systems.

[0006] One object of the invention is to provide a sufficiently large resonance chamber for a low-frequency loudspeaker of a motor vehicle of the aforementioned type.

[0007] This problem is solved by the independent patent claim. Advantageous embodiments are described in the dependent patent claims, the following description, and the figures, whereby these embodiments, either individually or in different combinations of at least two of them, can represent a further developing or advantageous aspect of the invention.

[0008] A motor vehicle according to the invention comprises a passenger compartment of the motor vehicle bounding the floor on the floor side, at least one electrical energy storage device arranged at least partially on the floor side below at least one section of the interior floor, and at least one low-frequency loudspeaker arranged at least partially in the passenger compartment, wherein at least one cavity is present between the interior floor and the electrical energy storage device, and wherein the low-frequency loudspeaker is arranged at at least one opening in the interior floor that communicates with the cavity, such that the cavity forms a resonance chamber for the low-frequency loudspeaker.

[0009] According to the invention, the resonance chamber for the low-frequency loudspeaker is formed by the existing cavity between the interior floor and the electrical energy storage device. A cavity that is generally already present and sufficiently large is used to create the resonance chamber, so that other components of the motor vehicle or the vehicle body do not need to be structurally modified to create a resonance chamber, which, as described above, is only possible to a very limited extent or not at all in modern vehicle structures.

[0010] According to the invention, no additional resonance chamber needs to be created, resulting in cost savings. Furthermore, no complex adapter housing is required to connect the woofer to the resonance chamber, as is necessary, for example, in DE 197 35 082 A1. This also leads to a reduction in weight. Moreover, the invention significantly increases flexibility regarding the installation location of the woofer on the interior floor, since the woofer can be mounted anywhere on the interior floor where a cavity exists between the interior floor and the electrical energy storage device.

[0011] The electrical energy storage system can be located partially or completely below the interior floor or below a section of the interior floor. The electrical energy storage system comprises several electrical storage cells, for example in the form of lithium-ion battery cells, which can be combined into battery modules or the entire electrical energy storage system by means of a housing or similar structure.

[0012] The low-frequency loudspeaker comprises a vibrating diaphragm and an electromagnetic drive that powers the diaphragm. The maximum excursion of the vibrating diaphragm is designed such that it does not touch the electrical energy storage device. The vehicle may also have two or more low-frequency loudspeakers, each of which is at least partially located in the passenger compartment and may be positioned below a vehicle seat.

[0013] The cavity between the interior floor and the electrical energy storage device can, for example, be several millimeters high and extend over part or all of the electrical energy storage device. In particular, the cavity is often shallow.

[0014] The fact that the opening is connected to the cavity means that the opening represents an opening in the cavity towards the passenger compartment. Preferably, the opening is airtight and sealed with the low-frequency loudspeaker or its diaphragm.

[0015] The motor vehicle can be an electric vehicle or a hybrid electric vehicle. In particular, the motor vehicle can be a passenger car.

[0016] According to the invention, the opening is arranged in a dome-shaped projection of the interior floor, pointing towards the passenger compartment. This simplifies the coupling of the low-frequency loudspeaker to the shallow cavity and simultaneously allows a vibrating diaphragm of the low-frequency loudspeaker to project into the projection, thus enabling better introduction and distribution of the sound pressure generated by the vibrating diaphragm into the shallow cavity. This is particularly advantageous because, during sound pressure generation, the vibrating diaphragm moves essentially transversely or perpendicularly to a main plane of extension of the cavity. However, the sound pressure should be introduced into the cavity transversely to the direction of movement of the vibrating diaphragm, which makes the arrangement of the low-frequency loudspeaker on the projection possible.

[0017] Another advantageous embodiment provides that a surface of the projection facing the cavity and / or a transition area where the projection merges into the rest of the interior floor is rounded. This rounding improves the sound pressure transmission and distribution into the cavity, as sound waves are not broken up or stopped by sharp edges.

[0018] In a further advantageous embodiment, the vibrating diaphragm of the woofer is convex on its side facing the cavity. This causes the diaphragm to project into the recess to a certain extent, encompassing sections that, when the diaphragm is excited, generate sound pressure waves. These waves propagate perpendicular to the diaphragm's axis of movement, thus propagating directly and optimally within the shallow cavity. The convex shape of the diaphragm can be achieved through a rounded or stepped design.

[0019] Advantageously, the vibration membrane is shaped like a frustocone. This means that the vibration membrane encompasses a lateral surface which, when the vibration membrane is excited, generates sound pressure waves that propagate perpendicular to an axis of movement of the vibration membrane and thus spread directly and optimally within the shallow cavity.

[0020] According to a further advantageous embodiment, the vibrating diaphragm of the low-frequency loudspeaker is concave on its side facing the cavity. This alternative design of the vibrating diaphragm also enables improved transmission of sound pressure waves in the direction of the main plane of extension of the shallow cavity. The concave shape of the vibrating diaphragm can be achieved by a rounded or stepped design.

[0021] Further details, features and advantages of the invention will become apparent from the following description and the figures. These show: Fig. 1 a schematic side view of a section of an embodiment of a motor vehicle according to the invention; Fig. 2 a schematic top view of the in Fig. 1 section of the motor vehicle shown; Fig. 3 a schematic side view of a section of a further embodiment of a motor vehicle according to the invention; and Fig. 4 a schematic side view of a section of a further embodiment of a motor vehicle according to the invention.

[0022] In the figures, identical or functionally equivalent components are provided with the same reference symbols.

[0023] Fig. Figure 1 shows a schematic side view of a section of an embodiment of a motor vehicle according to the invention.

[0024] The motor vehicle 1 comprises a passenger compartment 2 and the interior floor 3, which limits the floor area of ​​the motor vehicle 1.

[0025] Furthermore, the motor vehicle 1 includes an electrical energy storage device 4 located on the underside below the interior floor 3. The energy storage device 4 comprises several electrical storage cells 5 arranged in a housing 6 which is closed with a cover 7.

[0026] Furthermore, the motor vehicle 1 includes a low-frequency loudspeaker 8, partially located in the passenger compartment 2, of which in Fig. 1 only a housing part 9 and a section of a drive 10 are shown.

[0027] A cavity 11 exists between the interior floor 7 and the electrical energy storage unit 4. The low-frequency loudspeaker 8 is connected to the cavity 11 in such a way that it communicates with it. Fig. 1. The opening in the interior floor 3 (not shown) is arranged so that the cavity 11 forms a resonance chamber for the low-frequency loudspeaker 8.

[0028] The opening can be seen at a dome-shaped opening pointing towards the passenger compartment 2, in Fig. 1. The projection of the interior floor 3 (not shown) may be arranged. A surface of the projection facing the cavity 11 and / or a transition area where the projection merges into the rest of the interior floor 3 may be rounded.

[0029] One in Fig. 1 The vibrating membrane of the low-frequency loudspeaker 8, which is not shown, can be convex, in particular frustoconical, or concave on its side facing the cavity 11.

[0030] Fig. Figure 2 shows a schematic top view of the in Fig. 1 section of the motor vehicle 1 shown. The low-frequency loudspeaker 8 is arranged centrally on the section of the interior floor 3 shown.

[0031] Fig. Figure 3 shows a schematic side view of a section of a further embodiment of a motor vehicle 12 according to the invention. This motor vehicle 12 differs from the one described in the Fig. 1 and Fig. In the embodiment shown in Figure 2, the opening (not shown) is arranged in a dome-shaped projection 13 of the interior floor 3, which points towards the passenger compartment 2. A surface of the projection 13 facing the cavity 11 and a transition area where the projection 13 merges into the rest of the interior floor 3 are rounded. Furthermore, the motor vehicle 12 differs from the one shown in the Fig. 1 and Fig. In the embodiment shown in Figure 2, the vibrating diaphragm 14 of the low-frequency loudspeaker 15 is convex or frustoconical on its side facing the cavity 11. This allows the sound pressure waves (not shown) to be introduced into the cavity 11 transversely to the direction of movement of the vibrating diaphragm 14, indicated by the double arrow 16, in accordance with the arrows shown. The electrical energy storage device 4 is located in Fig. Only the lid 7 was shown.

[0032] Fig. Figure 4 shows a schematic side view of a section of a further embodiment of a motor vehicle 17 according to the invention. This motor vehicle 17 differs from the one described in the Fig. 1 and Fig. In the embodiment shown in Figure 2, the opening 18 is arranged on a dome-shaped projection 19 of the interior floor 3, which points towards the passenger compartment 2. A surface of the projection 19 facing the cavity 11 and a transition area where the projection 19 merges into the rest of the interior floor 3 are rounded. Furthermore, the motor vehicle 17 differs from the one shown in the Fig. 1 and Fig. In the embodiment shown in Figure 2, the vibrating diaphragm 20 of the low-frequency loudspeaker 21 is concave on its side facing the cavity 11. This allows the sound pressure waves (not shown) to be introduced into the cavity 11 transversely to the direction of movement of the vibrating diaphragm 20, as indicated by the double arrow 16, in accordance with the arrows shown. The electrical energy storage device 4 is located in Fig. 4 only the lid 7 is shown. Reference symbol list: 1 motor vehicle 2 passenger compartment 3 Interior floor 4 electrical energy storage 5 electrical storage cells out of 4 6 cases of 4 7 lids out of 6 8 bass speakers 9 housing part of 8 10 drive out of 8 11 Cavity 12 Motor vehicle 13 lead out of 3 14 vibration membrane out of 15 15 bass speakers 16 Double arrow (direction of movement from 14, 20) 17 Motor vehicle 18 Breakthrough 19 lead over 3 20 vibration membrane out of 21 21 bass speakers

Claims

[1] Motor vehicle (1, 12, 17) with an interior floor (3) defining a passenger compartment (2) of the motor vehicle (1, 12, 17) on the floor side, at least one electrical energy storage device (4) arranged at least partially on the floor side below at least one section of the interior floor (3) and at least one low-frequency loudspeaker (8, 15, 21) arranged at least partially in the passenger compartment (2), wherein at least one cavity (11) is provided between the interior floor (3) and the electrical energy storage device (4), characterized by , that the low-frequency loudspeaker (8, 15, 21) is arranged on at least one opening (18) of the interior floor (3) connected to the cavity (11) in such a way that the cavity (11) forms a resonance chamber for the low-frequency loudspeaker (8, 15, 21), wherein the opening (18) is arranged on a dome-shaped projection (13, 19) of the interior floor (3) pointing towards the passenger compartment (2). [2] Motor vehicle (1, 12, 17) according to claim 1, characterized by , that a surface of the projection (13, 19) facing the cavity (11) and / or a transition area in which the projection (13, 19) transitions into the rest of the interior floor (3) is rounded. [3] Motor vehicle (1, 12) according to claim 1 or 2, characterized by , that a vibrating membrane (14) of the low-frequency loudspeaker (8, 15) is convex on its side facing the cavity (11). [4] Motor vehicle (1, 12) according to claim 3, characterized by , that the vibration membrane (14) is frustoconical in shape. [5] Motor vehicle (1, 17) according to claim 1 or 2, characterized by , that a vibration membrane (20) of the low-frequency loudspeaker (8, 21) is concave on its side facing the cavity (11).

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