Motor vehicle with ventilation system

Abstract

The invention relates to a motor vehicle (1) with a ventilation device, comprising a vacuum generating device (3) with at least one Venturi nozzle (4) in which a vacuum can be generated when the motor vehicle (1) moves forward, such that air can be drawn out of an interior space (5), in particular a passenger compartment, of the motor vehicle (1) by means of the Venturi nozzle (4).

Description

[0001] The present invention relates to a motor vehicle with a ventilation device having the features of claim 1.

[0002] Ventilation systems in motor vehicles are used to draw fresh outside air into the vehicle interior and remove stale air. A ventilation system thus ensures a comfortable climate inside the vehicle and prevents the formation of unpleasant odors or moisture buildup. An effective ventilation system is therefore an essential component of every modern motor vehicle.

[0003] One problem with conventional vehicle ventilation systems is that they often take some time to adequately cool a heated passenger compartment. In particular, if a vehicle is parked in the sun and the interior heats up considerably as a result, the ventilation system can take a long time to remove the heated air from the vehicle interior and replace it with cooler or cooled ambient air.

[0004] The object of the present invention is therefore to provide a motor vehicle with a ventilation device with which the interior of the motor vehicle can be cooled quickly and effectively. In particular, a solution that is as energy-efficient as possible should be provided.

[0005] This problem is solved by a motor vehicle with the features of claim 1. Preferred features are the subject of the dependent claims. Further advantages and features can be found in the general description and the exemplary embodiments.

[0006] The motor vehicle according to the invention has a ventilation device. The ventilation device includes a negative pressure generating device with at least one Venturi nozzle. The Venturi nozzle is designed such that a negative pressure can be generated in the Venturi nozzle when the motor vehicle moves forward. The Venturi nozzle is fluidically connected to an interior space, in particular a passenger compartment, of the motor vehicle in such a way that air can be drawn out of the interior space by means of the generated negative pressure.

[0007] The vacuum system actively removes stale air from the vehicle's interior. The Venturi nozzle itself requires no external power source, so this process does not negatively impact fuel consumption. Furthermore, the Venturi nozzle is inexpensive to manufacture and requires minimal maintenance. This also reduces the load on the vehicle's air conditioning system, which in turn further improves fuel efficiency.

[0008] The following describes the operation of the Venturi nozzle according to a preferred embodiment of the vehicle according to the invention. When the vehicle moves forward, a volume of air enters the Venturi nozzle through an inlet opening. This air flows into a constricted section of the Venturi nozzle. The flow cross-section of this constricted section narrows to a connecting section. This connecting section forms the narrowest part of the Venturi nozzle, i.e., the section with the smallest flow cross-section. The dynamic pressure, or stagnation pressure, is at its maximum there, and the hydrostatic pressure is at its minimum. The air velocity increases proportionally to the cross-sectional area as it flows into the narrower section because the same mass flows through the entire tube per unit time (continuity law). This creates a negative pressure in the connecting section, which is used to draw in air from the interior of the vehicle.

[0009] Preferably, the vacuum generating device can be at least partially arranged on or integrated into the body and / or underbody of the motor vehicle.

[0010] In a preferred embodiment of the vehicle according to the invention, the Venturi nozzle has an inlet opening through which, during forward movement of the vehicle, an airflow can enter a constricted section of the Venturi nozzle, the flow cross-section of which narrows towards a connecting section. The vacuum generating device has a suction duct with which the interior of the vehicle is fluidically connected to the connecting section, in particular in a closable manner. The suction duct allows the path for the aspirated air to be planned and implemented as required. In particular, an interior-side opening of the suction duct can be positioned as needed. Since heated, used air rises, the interior-side opening of the suction duct can, for example, be advantageously arranged in an upper area of ​​the interior or in the area of ​​the roof.Furthermore, the suction duct can be divided so that air can be extracted from several points in the interior, for example. Alternatively, several separate suction ducts can be connected to the connection section.

[0011] In a further preferred embodiment of the motor vehicle according to the invention, the ventilation device has an inlet valve with which the inlet opening can be at least partially closed. In this way, the operation of the Venturi nozzle can be controlled or regulated. A suction flow can thus be generated as required, depending on the degree of opening of the inlet valve. For example, the inlet opening can be partially closed by the inlet valve to generate a reduced suction flow from the interior to the Venturi nozzle. Alternatively, the inlet valve can be completely closed, so that no suction flow from the interior to the Venturi nozzle is generated.

[0012] In a further preferred embodiment of the motor vehicle according to the invention, the ventilation device has a suction duct valve with which the suction duct can be closed. In this way, the operation of the Venturi nozzle can be controlled or regulated. A suction flow can thus be generated as required, depending on the degree of opening of the suction duct valve. For example, the suction duct can be partially closed by the suction duct valve to generate a reduced suction flow from the interior to the Venturi nozzle. Alternatively, the suction duct valve can be completely closed so that no suction flow is generated from the interior to the Venturi nozzle.

[0013] Preferably, the vacuum generating device includes a control unit configured to actuate the inlet valve and / or the intake valve. The inlet valve and / or the intake valve can, for example, be in the form of an air flap. The control unit can be configured to receive information about the prevailing weather conditions (e.g., from a rain sensor in the vehicle) and, for example, to close at least one of the valves when it is raining.

[0014] In a further preferred embodiment of the motor vehicle according to the invention, the vacuum generating device is arranged in the roof of the motor vehicle. In this way, the vacuum generating device is positioned as close as possible to the area of ​​the motor vehicle where warm, used air collects in the interior, so that the extraction of this air can be implemented in a structurally simple manner. Furthermore, arranging the vacuum generating device in the roof of the motor vehicle offers the advantage that the lower, flat part of the roof, in particular the headliner, which adjoins the interior of the motor vehicle, is thermally decoupled from the outer, upper, flat part of the roof, which is exposed to the sun, by means of the Venturi nozzle arranged between them.In this way, the vacuum generating device helps to reduce the entry of thermal energy through the vehicle roof, thus promoting a cooler climate in the vehicle's interior. Alternatively, the vacuum generating device can be located in a side panel of the vehicle, in particular in a fender or side door.

[0015] In a further preferred embodiment of the motor vehicle according to the invention, the vacuum generating device has at least one additional Venturi nozzle. This allows the airflow in the vehicle interior to be easily divided, so that air can be extracted, for example, at several points in the interior. Preferably, the additional Venturi nozzle is spaced transversely to the forward direction of travel from the first Venturi nozzle. Alternatively, the additional Venturi nozzle can be connected in series with the first Venturi nozzle. In this case, the additional Venturi nozzle is arranged downstream of the first Venturi nozzle with respect to the forward direction of travel, with an outlet opening of the first Venturi nozzle being fluidically connected to the inlet opening of the additional Venturi nozzle. It can be advantageous to arrange several rows of Venturi nozzles arranged one behind the other and connected in series, side by side transversely to the forward direction of travel.

[0016] It is expressly pointed out that the embodiments of the invention described above can each be combined individually or in any technically meaningful combination with each other with the subject matter of the independent claims.

[0017] Variations and embodiments of the invention, as well as further advantages and details of the invention, can be found in the following description and the drawings. The schematic figures show: Fig. 1 a first embodiment of a motor vehicle according to the invention in a top view; Fig. 2 the exemplary embodiment from Fig. 1 in a side view; and Fig. 3 a second embodiment of a motor vehicle according to the invention in a top view.

[0018] Parts that have the same or similar effects are provided with identical reference numbers, if applicable.

[0019] Individual technical features of the embodiments described below can also be combined with previously described embodiments as well as the features of the independent claims and any further claims to create objects according to the invention.

[0020] The Fig. 1 and Fig. Figure 2 shows a first embodiment of a motor vehicle 1 according to the invention with a ventilation device. The ventilation device has a negative pressure generating device 3 with a Venturi nozzle 4, in which a negative pressure can be generated when the motor vehicle 1 moves forward, such that air can be drawn out of an interior space 5 of the motor vehicle 1 by means of the Venturi nozzle 4. In this case, the interior space 5 is the passenger compartment of the motor vehicle.

[0021] When the vehicle 1 moves forward in the direction of travel F, an airflow L enters the Venturi nozzle 4 through an inlet opening 6. The airflow L flows into a constricted section 7 of the Venturi nozzle 4. The flow cross-section of the constricted section 7 narrows to a connecting section 8. The connecting section 8 forms the narrowest part of the Venturi nozzle 4, i.e., the section with the smallest flow cross-section. A vacuum is created there, which is used to draw in air from the interior 5 of the vehicle. The vacuum generating device 3 has a suction channel 9, which fluidically connects the interior 5 of the vehicle 1 to the connecting section 8, so that a suction flow S can be generated from the interior 5 to the connecting section 8.The air extracted from the interior 5 then mixes with the airflow L and is discharged into the environment of the motor vehicle 1 via an outlet section 11 of the Venturi nozzle 4.

[0022] The ventilation device has an inlet valve 60 – here in the form of an air flap – with which the inlet opening 6 can be partially or completely closed. Furthermore, the ventilation device has a suction duct valve 90 – also here in the form of an air flap – with which the suction duct 9 can be at least partially closed. The suction flow can be regulated as required via the valves 60 and 90. Preferably, the vacuum generating device 3 has a control unit (not shown) configured to actuate the inlet valve 60 and / or the suction duct valve 90. For example, when the motor vehicle 1 is started after a certain period of standing in the sun, the inlet valve 60 and the suction duct valve 90 are opened, so that the airflow entering the Venturi nozzle 4 creates a suction flow S that draws out the warm air accumulated in the interior 5.The climate control of interior space 5 is accelerated in this way. Once a certain temperature is reached in interior space 5, valves 60 and 90 can be closed via the control unit. The control unit can be configured to receive information about the prevailing weather conditions and, for example, to also close at least one of valves 60 or 90 if it is raining.

[0023] The vacuum generating device 3 is located in the roof 10 of the motor vehicle 1 and thus as close as possible to the area of ​​the motor vehicle 1 where the warm, used air collects in the interior 5. Furthermore, arranging the vacuum generating device 3 in the roof 10 of the motor vehicle 1 offers the advantage that the lower flat part of the roof, in particular the headliner 10b, which adjoins the interior 5 of the motor vehicle 1, is thermally decoupled from the outer surface 10a of the roof 10, which is exposed to the sun, by the Venturi nozzle 4 located between them. Alternatively, the vacuum generating device 3 can be located in a side panel of the motor vehicle 1, in particular in a fender or a side door 12 of the motor vehicle 1.

[0024] Fig. Figure 3 shows a second embodiment of a motor vehicle 1 according to the invention. The ventilation device of the second embodiment differs from the ventilation device of the first embodiment in that the vacuum generating device 3 has a first Venturi nozzle 4 and a further Venturi nozzle 4a. The Venturi nozzles 4 and 4a are arranged transversely to the forward direction of travel F, spaced apart from the Venturi nozzle 4. Otherwise, the Venturi nozzles 4 and 4a correspond to those described in the Fig. 1 and Fig. 2 described structure.

[0025] It should also be noted that "showing" does not exclude any other elements or steps and "a" or "an" does not exclude a multitude.

[0026] The scope of protection of the present invention is defined by the patent claims and is not limited by the features explained in the description or shown in the figures.

Claims

[1] Motor vehicle (1) with a ventilation device, comprising a vacuum generating device (3) with at least one Venturi nozzle (4) in which a vacuum can be generated when the motor vehicle (1) moves forward, such that air can be drawn out of an interior space (5), in particular a passenger compartment, of the motor vehicle (1) by means of the Venturi nozzle (4). [2] Motor vehicle (1) according to claim 1, wherein the Venturi nozzle (4) has an inlet opening (6) through which, during a forward movement of the motor vehicle (1), an airflow (L) can enter a constriction section (7) of the Venturi nozzle (4), the flow cross-section of which narrows towards a connection section (8), wherein the vacuum generating device (3) has a suction channel (9) with which the interior (5) of the motor vehicle is fluidically connected to the connection section (8). [3] Motor vehicle (1) according to claim 2, wherein the ventilation device has an inlet opening valve (60) with which the inlet opening (6) can be at least partially closed. [4] Motor vehicle (1) according to claim 2 or 3, wherein the ventilation device has a suction duct valve (90) with which the suction duct (9) can be at least partially closed. [5] Motor vehicle (1) according to one of the preceding claims, wherein a vacuum generating device (3) is arranged in a roof (10) of the motor vehicle (1). [6] Motor vehicle (1) according to one of the preceding claims, wherein vacuum generating device (3) is arranged in a side part of the motor vehicle (1), in particular in a side door (12) of the motor vehicle (1). [7] Motor vehicle (1) according to one of the preceding claims, wherein the vacuum generating device (3) has at least one further Venturi nozzle (4a). [8] Motor vehicle (1) according to claim 7, wherein the further Venturi nozzle (4a) is spaced apart from the Venturi nozzle (4) transversely to the forward direction of travel (F). [9] Motor vehicle (1) according to claim 7, wherein the further Venturi nozzle (4a) is connected in series with the Venturi nozzle (4).

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