Device for the combined reduction of carbon dioxide and water or moisture content, motor vehicle and method

Description

Technical area

[0001] The present invention relates to a device for the combined reduction of the carbon dioxide and water or moisture content in a defined air volume, in particular in a passenger compartment of a motor vehicle, a motor vehicle having such a device and a method for operating such a device. State of the art

[0002] For at least partially electrically powered vehicles, it is advantageous to save as much energy as possible to achieve the greatest possible range. For comfort reasons, the passenger compartment of such a vehicle is typically air-conditioned using an air conditioning system. With regard to the desired energy savings, it is advantageous if the air conditioning system for conditioning the passenger compartment draws in as little fresh air as possible from the vehicle's surroundings and heats or cools it, but instead recirculates and conditions the air in the passenger compartment in recirculation mode.

[0003] However, in the aforementioned recirculation mode for air conditioning the passenger compartment, water contained in the exhaled air of occupants or passengers can accumulate in the passenger compartment, which can lead to fogging of windows, such as the windshield or side windows, of the vehicle. The reason for this is that the dehumidifying effect of an air conditioning system, which results from the temperature in the evaporator heat exchanger falling below the dew point, cannot be utilized in recirculation mode. This must be avoided or at least reduced for safety reasons.

[0004] Furthermore, carbon dioxide contained in exhaled air can also accumulate in the passenger compartment. This can lead to impaired concentration or even health problems for the occupants. This, too, must be prevented or at least reduced, both for safety and health reasons, since, in the worst case, excessive carbon dioxide concentration in the interior air can severely impair the driver's ability to concentrate, leading to a risk of accidents.

[0005] WO 2004 / 101113 A1 describes a filter device for removing contaminants from the breathing air in a vehicle. The air to be filtered is forced through a carbon dioxide filter by a fan, so that the carbon dioxide in the air is trapped in the carbon dioxide filter. After filtering, the filter is regenerated, and the trapped carbon dioxide is removed by a process in which air heated by a thermal resistor is passed through the filter. Disclosure of the invention

[0006] It is therefore an object of the invention to provide an improved device for reducing the carbon dioxide and water content for a passenger compartment of a motor vehicle.

[0007] Accordingly, a device for the combined reduction of the carbon dioxide and water content in a confined air volume, in particular in a passenger compartment of a motor vehicle, is proposed according to claim 1. The device comprises a first sorption unit for the combined sorption of carbon dioxide and water, a second sorption unit for the combined sorption of carbon dioxide and water, wherein the first sorption unit and the second sorption unit each contain a plurality of sorbents, wherein the sorption units are each switchable from a sorption mode, in which the sorption units sorb carbon dioxide and water from raw air of the confined air volume, to a desorption mode, in which the sorption units desorb carbon dioxide and water from supplied regeneration air, and vice versa, and an air distribution device,by means of which the sorption units can be alternately switched from the sorption mode to the desorption mode and vice versa depending on the carbon dioxide and water content in the defined air volume, such that in at least one operating state of the device, one of the two sorption units is in the sorption mode, while the other of the two sorption units is in the desorption mode.

[0008] In the desorption mode, the regeneration air passed through the sorption unit, which is in the desorption mode, can be supplied to an environment as loaded regeneration air, in particular via a desorption line.

[0009] The motor vehicle is preferably an electric vehicle or a hybrid vehicle. However, the motor vehicle can also be powered by an internal combustion engine. The motor vehicle comprises, in particular, a body that encloses the confined air volume. "Confined" here means that the body defines the boundaries or a geometric extent of the air volume. However, this does not necessarily mean that the confined air volume cannot exchange air with the surroundings of the motor vehicle. The confined air volume is preferably the passenger compartment of the motor vehicle. In particular, occupants or passengers are located in the confined air volume. The confined air volume is not necessarily assigned to a motor vehicle.The confined air volume may also be associated with a watercraft, construction machinery or vehicle, rail vehicle, agricultural machinery or vehicle, or aircraft. However, the confined air volume may also be part of a building or stationary machine.

[0010] In particular, the device or the air distribution system is controlled based on sensor signals. A control unit can be provided for this purpose. Furthermore, sensors, in particular pressure sensors, temperature sensors, and / or sensors for detecting the carbon dioxide and water content, are preferably provided. For example, the sorption mode is activated when the carbon dioxide content rises above a predetermined value.

[0011] The sorption units are particularly suitable for adsorbing carbon dioxide and water. The sorption units can also be suitable for absorbing carbon dioxide and water. "Sorption" refers to processes that lead to the enrichment of a substance, for example, carbon dioxide or water, within a phase or at an interface between two phases. Enrichment within a phase is referred to as absorption, while enrichment at the interface is referred to as adsorption. "Desorption" refers to processes in which atoms or molecules, especially carbon dioxide or water, leave the surface of a solid. Desorption thus generally represents the reverse process of sorption.

[0012] The sorption units can be pure adsorption units or can be designated as such. Preferably, the sorption units each have a cartridge shape, allowing for quick and easy replacement. The sorption units can have a cylindrical shape, in particular a hollow cylindrical shape, a plate shape, a cake shape, or any other geometry.

[0013] According to the invention, the sorption units each comprise a plurality of sorbents or sorbents. In particular, a sorbent can be provided that is suitable for sorbing, preferably adsorbing, carbon dioxide. This sorbent can be referred to as a carbon dioxide sorbent or CO2 sorbent. Another sorbent can be provided that is suitable for sorbing, in particular adsorbing, water. This sorbent can be referred to as a water sorbent or H2O sorbent. The sorbents can be in granular or fiber form, in particular in the form of a bed. In particular, the sorbents are fixed with the aid of a carrier material. The sorbents can also be pure adsorbents or be referred to as such.

[0014] The sorption mode can also be a pure adsorption mode or be referred to as such. The desorption mode can also be referred to as the regeneration mode. The fact that the sorption units can be "transferred" from the sorption mode to the desorption mode and vice versa is to be understood in particular as the ability to switch back and forth between the sorption mode and the desorption mode. This switching is preferably carried out with the aid of the air distribution device, such that either the raw air or the regeneration air is supplied to the sorption units. For this purpose, the air distribution device preferably has several valves or flaps. The air distribution device can be a flap system or a flap device or be referred to as such.

[0015] The air distribution device being capable of switching the sorption units "alternately" means, in particular, that, for example, the first sorption unit is in sorption mode while the second sorption unit is in desorption mode. After switching using the air distribution device, the situation is exactly the opposite.

[0016] The regeneration air can be taken from the confined air volume or from the vehicle's surroundings. Initially, the regeneration air is unloaded. In desorption mode, the unloaded regeneration air is loaded with carbon dioxide and water and released into the environment as loaded regeneration air. The term "unloaded" with carbon dioxide and water specifically means that the regeneration air can absorb carbon dioxide and water stored in the sorption unit in desorption mode. However, this does not preclude the unloaded regeneration air from absorbing a certain amount of carbon dioxide and water. However, the unloaded regeneration air is not saturated with carbon dioxide and water. Therefore, the unloaded regeneration air can also be taken from the confined air volume.

[0017] By operating the sorption units alternately, an uninterrupted and thus continuous reduction of the carbon dioxide and water content in the confined air volume is possible. This means that recirculation can take place in the confined air volume without having to draw in ambient air from the surroundings to keep the carbon dioxide and water content sufficiently low. This reliably prevents the accumulation of carbon dioxide and water in the confined air volume, with the disadvantages explained above. By omitting the supply of ambient air to the vehicle air conditioning system, energy savings can be achieved, as there is no need to cool or heat the supplied ambient air. In the case of an electrically powered vehicle, this leads to an extension of the vehicle's range.Furthermore, eliminating the need for ambient air can extend the service life of a vehicle's cabin air filter, as there's no need to filter out particulates from the ambient air. Another beneficial effect is that the components of a vehicle air conditioning system (respective heat exchangers for the heat sink and heat source, compressor, etc.) can be designed smaller, which offers potential for downsizing.

[0018] In embodiments, the air distribution device comprises a plurality of valves that can be switched such that, during operation of the device, the raw air from the confined air volume can be supplied to the sorption unit in the sorption mode in order to remove the carbon dioxide and water from the raw air, and the regeneration air can be supplied to the sorption unit in the desorption mode in order to remove the carbon dioxide and water from the sorption unit. Preferably, four valves are provided. The valves can be flap valves. Preferably, the valves are multi-way valves, in particular three-way valves or 4-, 6-, or 8-way valves.

[0019] The device further comprises at least one heating element for introducing heat into the sorption unit in desorption mode. Each sorption unit is assigned such a heating element. The heating element can be a heating wire guided through the respective sorption unit. However, the heat can also be introduced into the sorption unit in desorption mode in any other way. For example, the heat can be waste heat from an electric motor for driving the motor vehicle. The heating is expediently only switched on when the respective sorption unit is in desorption mode.

[0020] In embodiments, a heating element is integrated into each sorption unit. This means that the heating element is firmly, in particular inseparably, connected to the sorption unit assigned to it. This can be achieved, for example, with the aid of a heating wire as mentioned above. In particular, a first heating element is assigned to the first sorption unit, and a second heating element is assigned to the second sorption unit. Each sorption unit can comprise multiple heating elements.

[0021] In embodiments, the heating element is positioned upstream of the sorption units. "Upstream" in this case means upstream of the sorption units along a flow direction of the unloaded regeneration air supplied from the sorption units. In this case, the heating element is not integrated into the sorption units. The heating element is arranged, in particular, outside the sorption units. The heating element introduces heat into the unloaded regeneration air, which absorbs water and carbon dioxide in the desorption mode of the respective sorption unit and is removed from the sorption units as loaded regeneration air. The heating element can be a heat exchanger or comprise a heat exchanger. The heat used for heating can be taken from a coolant circuit, for example, a conventional combustion engine, a battery cooling system, or a fuel cell cooling circuit.In addition, the sorption units can also include heating elements integrated into them.

[0022] In some embodiments, the sorption units have a common heating element. This means that only one or exactly one heating element is provided for both sorption units. This eliminates the need for a separate heating element for each sorption unit.

[0023] In embodiments, the device further comprises a regeneration valve, which has a first switching position in which the regeneration air from an environment of the confined air volume can be supplied to the sorption unit in desorption mode, a second switching position in which the regeneration air from the confined air volume can be supplied to the sorption unit in desorption mode, and in particular a third switching position in which the sorption unit in desorption mode can be regenerated under vacuum. The regeneration valve is preferably a three-way valve. A check valve can be provided downstream of the regeneration valve to prevent the regeneration air laden with carbon dioxide and water from flowing back into the confined air volume.

[0024] In embodiments, the device further comprises a blower device that supplies the raw air to the sorption unit in sorption mode. The blower device is preferably a fan. The blower device can also be referred to as the first blower device or as the sorption blower device. The sorption capacity of the sorption unit in sorption mode can be adjusted, for example, by changing the volume flow generated by the blower device. The volume flow can be influenced by changing the speed of the blower device.

[0025] In some embodiments, the blower device is part of an air conditioning system. This eliminates the need for a separate blower device for the device. In particular, the device can be partially or fully integrated into the air conditioning system. Alternatively, the device can be completely separate from the air conditioning system as a modular component and thus be self-contained.

[0026] In embodiments, the device further comprises a blower device that supplies the regeneration air to the sorption unit in the desorption mode, wherein the blower device is arranged on the pressure side or the suction side with respect to the sorption units. The blower device is preferably a fan. The blower device can also be referred to as a second blower device or as a desorption blower device. The first blower device and the second blower device can comprise a common drive element that can be coupled to and decoupled from the blower wheels of the blower devices by means of couplings. This eliminates the need for a drive element. The drive element is, in particular, an electric motor.

[0027] In embodiments, the device can further comprise a further bypass line and a further bypass valve, which can be selectively switched from a first switching state, in which the raw air can be supplied to the sorption unit that is in sorption mode, to a second switching state, in which the raw air can be guided around the sorption units with the aid of the bypass line back into the confined air volume, and vice versa. The second switching state (bypass) is preferably selected when the carbon dioxide and water content is below a predetermined value and thus no reduction of the carbon dioxide and water content in the confined air volume is required. Alternatively, the bypass line can also be actively switched to carry out sensor tests or calibrations and / or when the pressure loss across one of the sorption units exceeds a predetermined limit.

[0028] According to the invention, a bypass line and a bypass valve are provided. The bypass valve according to the invention can be switched from a first switching state, in which the regeneration air can be supplied to the sorption unit in desorption mode, to a second switching state, in which the regeneration air can be discharged into the environment via the bypass line, bypassing the sorption units, and vice versa. The second switching state, which is a desorption bypass, is advantageously used to test any sensors provided in the system or when the pressure loss across one of the sorption units exceeds a predetermined limit.

[0029] A further embodiment provides for a branch in the desorption line downstream of the desorption blower device on the pressure side, which branch can be switched by means of a recirculation valve. The branch opens into a recirculation line that is fluidly connected to an inlet of the regeneration valve or, downstream of an outlet of the regeneration valve, opens into a regeneration air line connected to the outlet.

[0030] This ensures that at least part of the volume flow conveyed by the desorption blower device is recirculated, i.e. can be guided several times over the sorption unit, which is currently in desorption mode.

[0031] This primarily has energy-related advantages, as the heat introduced for regeneration is not released into the environment after passing through the sorption unit, which is in desorption mode, once. Instead, it is recirculated (circulated) until the air is completely saturated with CO2 and / or water, i.e., saturated. This drastically reduces the energy consumption of the heating system, which further contributes to the energy-efficient operation of the entire system.

[0032] According to one embodiment, the branch can be switchable by means of a recirculation valve, so that the regeneration air can be optionally recirculated through the sorption units or directed into the environment by means of the desorption blower device.

[0033] There are now various options for returning the air to the regeneration air line.

[0034] Firstly, according to one embodiment, the recirculation line can be fluidically connected to an inlet of the regeneration valve, wherein a fourth switching position, in which the regeneration air can be supplied from the recirculation line to the sorption unit in desorption mode, and vice versa, can be switched by means of the regeneration valve.

[0035] According to this embodiment, there is no continuous supply of unloaded regeneration air from the environment, but rather it is provided that the regeneration valve and the recirculation valve are switched cyclically in pairs to enable the supply of unloaded fresh air and the discharge of loaded regeneration air from the "recirculation circuit".

[0036] According to a second embodiment, which is preferred, it can be provided that a throttle valve, in particular an adjustable throttle valve, is arranged fluidically between the outlet of the regeneration valve and the junction of the recirculation line into the regeneration air line.

[0037] According to this embodiment, a continuous supply of unloaded regeneration air from the environment can now take place, wherein the rate at which unloaded regeneration air from the environment is supplied to the "recirculation circuit" can be adjusted as required.

[0038] In some embodiments, the sorption units are suitable for removing not only carbon dioxide and water but also fine particles, nitrogen oxides, and / or volatile organic compounds from the raw air. Additional suitable sorbents can be provided for this purpose. Furthermore, the sorption units can comprise a suitable filter medium for filtering out the fine particles. The filter medium can act as a carrier material for the sorbents.

[0039] In embodiments, the sorption units comprise a first sorbent suitable for adsorbing carbon dioxide, a second sorbent suitable for adsorbing water, and further sorbents suitable for freeing the untreated air of fine particles, nitrogen oxides, and / or volatile organic compounds. The further sorbents are introduced between two carrier layers, in particular made of a nonwoven fabric, or the sorbents and the further sorbents are mixed with one another. The number and type of the further sorbents is arbitrary. The further sorbents can comprise activated carbon, which, in particular in the form of a bed, is preferably introduced between the two carrier layers. The further sorbent or the further sorbents can be mixed with the CO2 sorbent and / or the H2O sorbent to form one or more mixed beds.

[0040] In some embodiments, the sorption units are suitable for removing allergens, bacteria, and / or viruses from the untreated air, in addition to carbon dioxide and water. This can be achieved by a functional coating of carrier materials, such as nonwovens, or by a functional coating of the sorbents. Furthermore, the sorption units can have at least one fragrance component for comfort purposes.

[0041] Furthermore, a motor vehicle according to claim 16 is proposed, comprising a device according to the invention. The device can be controlled based on the occupancy of the defined air volume with passengers in order to keep the carbon dioxide and water content in the defined air volume within a predetermined tolerance range, regardless of the occupancy. This always ensures that the carbon dioxide and water content does not increase undesirably. By adapting to the occupancy, energy can be saved because, for example, a lower output of the first blower device is selected when the vehicle is occupied by one passenger than when the vehicle is occupied by four passengers. The occupancy can be detected, for example, using weight sensors or optical sensors.

[0042] Furthermore, a method according to claim 17 is proposed for operating such a device for the combined reduction of the carbon dioxide and water content in a defined air volume, in particular in a passenger compartment of a motor vehicle. The device comprises a first sorption unit for the combined sorption of carbon dioxide and water, a second sorption unit for the combined sorption of carbon dioxide and water, and an air distribution device for alternately switching the sorption units from a sorption mode to a desorption mode and vice versa.The method comprises the following steps: a) switching one of the two sorption units, depending on the carbon dioxide and water content in the confined air volume, into sorption mode using the air distribution device, in which the sorption unit sorbs carbon dioxide and water from raw air in the confined air volume; b) switching the other of the two sorption units, using the air distribution device, into desorption mode, in which the sorption unit desorbs carbon dioxide and water into supplied regeneration air; and c) alternately performing steps a) and b) such that one of the two sorption units is operated in sorption mode while the other of the two sorption units is operated in desorption mode. Preferably, steps a) and b) are performed simultaneously. The features and embodiments described for the device also apply to the method, and vice versa.

[0043] In embodiments, heat is introduced into the sorption unit operating in desorption mode. As previously mentioned, heating elements can be provided for this purpose. However, the heat can also be introduced as waste heat from an electric motor.

[0044] In embodiments, the carbon dioxide and water content in the confined air volume is measured to control the device so that the carbon dioxide and water content in the confined air volume is maintained within a predetermined tolerance range. For this purpose, one or more sensors can be provided in the confined air volume. The device itself also preferably comprises a plurality of different sensors.

[0045] In embodiments, the occupancy of the confined air volume with passengers is detected in order to control the device such that the carbon dioxide and water content in the confined air volume is maintained within the specified tolerance range, regardless of the occupancy. The occupancy can be detected, for example, using weight sensors or optical sensors. Control based on the occupancy can save energy.

[0046] In embodiments, the desorption mode is carried out with regeneration air taken from the environment of the confined air volume, with regeneration air taken from the confined air volume, or under vacuum. Under vacuum, the desorption mode can preferably be carried out at lower temperatures. This advantageously results in energy savings. In the case where the regeneration air is taken from the confined air volume, the regeneration air corresponds in particular to the raw air, which in this case is not saturated with carbon dioxide and water, so that the raw air acting as regeneration air can still absorb carbon dioxide and water.

[0047] "One" in this case is not necessarily to be understood as limiting the number to exactly one element. Rather, multiple elements, such as two, three, or more, can also be considered. Any other counting term used here should also not be understood as requiring a precise limitation to the corresponding number of elements. Rather, numerical deviations upwards and downwards are possible. Short description of the drawings

[0048] It shows: Fig. 1: a schematic view of an embodiment of a motor vehicle; Fig. 2: a schematic view of an embodiment of a device for the combined reduction of carbon dioxide and water for the vehicle; Fig. 3: a highly simplified schematic view of the motor vehicle according to Fig. 1 ; Fig. 4: another highly simplified schematic view of the motor vehicle according to Fig. 1; Fig. 5: another highly simplified schematic view of the motor vehicle according to Fig. 1 ; Fig. 6: another highly simplified schematic view of the motor vehicle according to Fig. 1 ; Fig. 7: another highly simplified schematic view of the motor vehicle according to Fig. 1 ; Fig. 8: another highly simplified schematic view of the motor vehicle according to Fig. 1 ; Fig. 9: another highly simplified schematic view of the motor vehicle according to Fig. 1; Fig. 10: a highly simplified schematic view of a further embodiment of a motor vehicle; Fig. 11: a highly simplified schematic view of a further embodiment of a motor vehicle; Fig. 12: a highly simplified schematic view of a further embodiment of a motor vehicle; Fig. 13: a highly simplified schematic view of a further embodiment of a motor vehicle; Fig. 14: a schematic view of an embodiment of a blower device for the device according to Fig. 2 ; Fig. 15: a schematic view of another embodiment of a blower device for the device according to Fig. 2 ; Fig. 16: a schematic view of an embodiment of a coupling for the blower device according to Fig. 14 ; Fig. 17: a schematic view of another embodiment of a blower device for the device according to Fig. 2; Fig. 18: a schematic view of an embodiment of a coupling for the blower device according to Fig. 17 ; Fig. 19: a schematic block diagram of an embodiment of a method for operating the device according to Fig. 2 ; Fig. 20: a further development of the motor vehicle according to Fig. 5 with a recirculation line in the desorption circuit; Fig. 21: a further development of the motor vehicle according to Fig. 5 with a throttled recirculation line in the desorption circuit; Fig. 22: an inventive development of the motor vehicle according to Fig. 5 with a bypass line in the desorption circuit; Fig. 23: a highly simplified schematic view of another embodiment of a motor vehicle; and Fig. 24: a further highly simplified schematic view of the motor vehicle according to Fig. 23 .

[0049] In the figures, identical or functionally equivalent elements have been given the same reference numerals unless otherwise indicated.

[0050] Embodiments Figure 22 shows an embodiment of the invention. Figures 20 , 21 , 23 and 24 are examples not according to the invention. Fig. 1shows a schematic view of an embodiment of a motor vehicle 1. The motor vehicle 1 is preferably an electric vehicle or a hybrid vehicle. However, the motor vehicle 1 can also be powered by an internal combustion engine. The motor vehicle 1 comprises a body 2 that encloses a defined air volume 3. "Delimited" here means that the body 2 defines the boundaries or a geometric extent of the defined air volume 3. However, this does not necessarily mean that the defined air volume 3 cannot be in air exchange with an environment U of the motor vehicle 1.

[0051] The confined air volume 3 is an interior or passenger compartment of the motor vehicle 1. However, the confined air volume 3 can also be assigned to a watercraft, a construction machine or vehicle, a rail vehicle, an agricultural machine or vehicle, or an aircraft. However, the confined air volume 3 can also be part of a building or a stationary machine.

[0052] However, it is assumed below that the confined air volume 3 is the passenger compartment of the motor vehicle 1. Therefore, the confined air volume 3 is referred to below as the passenger compartment. The passenger compartment 3 can be air-conditioned using an air conditioning system 4 (heating, ventilation, and air conditioning, HVAC). To extend the range of such an electrically powered motor vehicle 1, the greatest possible energy savings should be sought. With reference to the air conditioning system 4, this means that it should draw in as little fresh air as possible from the environment U of the motor vehicle 1 to air-condition the passenger compartment 3.However, when recirculated air taken in from the passenger compartment 3 is used to air-condition the passenger compartment 3, water (H2O) contained in the exhaled air of occupants or passengers can accumulate in the passenger compartment 3, which can lead to fogging of windows, for example a windshield or side windows, of the motor vehicle 1. This must be avoided or at least reduced with regard to safety aspects. Furthermore, carbon dioxide (CO2) contained in the exhaled air can also accumulate in the passenger compartment 3. This can lead to concentration disorders or even health impairments of the occupants. This, too, must be prevented or at least reduced with regard to both safety and health aspects.

[0053] The Fig. 2shows a schematic view of an embodiment of a device 5 for the combined reduction of CO2 and H2O, in particular water vapor, within the passenger compartment 3. With the aid of the device 5, the aforementioned disadvantages can be prevented or at least their effect reduced. Furthermore, with the aid of the device 5, it can also be prevented that contaminants from the environment U enter the passenger compartment 3, since the conditioning of the recirculated air largely eliminates the need for the intake of ambient air.

[0054] The device 5 comprises a first sorption unit 6 and a second sorption unit 7. "Sorption" is a collective term for processes that lead to the enrichment of a substance within a phase or at an interface between two phases. Enrichment within a phase is more precisely called absorption, while enrichment at the interface is called adsorption. This means that the sorption units 6, 7 are suitable for adsorbing and / or absorbing substances such as CO2 and H2O, but also nitrogen oxides (NOx) and / or volatile organic compounds (VOCs). Examples of volatile organic compounds are higher hydrocarbons. The sorption units 6, 7 can also be suitable for adsorbing and / or absorbing sulfur dioxide (SO2). However, the sorption units 6, 7 are preferably pure adsorber units or can be referred to as such.

[0055] The sorption units 6, 7 are preferably interchangeable and can, as explained below, be operated alternately in a sorption mode M1 and in a desorption mode M2. The sorption units 6, 7 are cartridge-shaped and can be referred to as cartridges or sorption cartridges. The sorption mode M1 can also be referred to as adsorption mode. The desorption mode M2 ​​can also be referred to as regeneration mode. This means that the first sorption unit 6 is in sorption mode M1 when the second sorption unit 7 is in desorption mode M2 ​​and vice versa. Thus, both sorption units 6, 7 are never in the same mode M1, M2 at the same time. The sorption units 6, 7 preferably each have a cartridge shape so that they are easily interchangeable.

[0056] Each sorption unit 6, 7 comprises a first sorbent 8 and a second sorbent 9.

[0057] The sorbents 8, 9 are preferably adsorbents or can be referred to as such. For example, the first sorbent 8 is suitable for adsorbing CO2. Accordingly, the second sorbent 9 can be suitable for adsorbing H2O. The two sorbents 8, 9 can thus remove H2O and CO2 from the passenger compartment 3. The first sorbent 8 is illustrated with small circles. The second sorbent 9 is illustrated with large circles. Further sorbents can also be provided, which are suitable, for example, for sorbing NOX or VOCs. Thus, any number of different sorbents 8, 9 can be provided for processing the recirculated air in the passenger compartment 3.

[0058] For example, in addition to the sorbents 8, 9, at least one further sorbent or several further sorbents (not shown) are provided which are suitable for freeing the raw air RO of fine particles, NOx and / or VOCs. The further sorbents can be introduced between two carrier layers, in particular carrier layers made of a fleece. Alternatively, the sorbents 8, 9 and the further sorbents can be mixed with one another. The further sorbents can comprise activated carbon, which is preferably introduced between the two carrier layers, in particular in the form of a bed. The further sorbent or the further sorbents can be mixed with the first sorbent 8 and / or with the second sorbent 9 in order to build up one or more mixed beds.

[0059] Furthermore, the sorption units 6, 7 can also be suitable for removing allergens, bacteria, and / or viruses from the raw air (RO) in addition to CO2 and H2O. This can be achieved by a functional coating of carrier materials, such as nonwovens, or by a functional coating of the sorbents 8, 9. Furthermore, the sorption units 6, 7 can have at least one fragrance component for comfort purposes.

[0060] The sorbents 8, 9 can each be in the form of spherical granules. Preferably, the sorbents 8, 9 are fixed to a carrier material or fixed with the aid of a carrier material. The sorption units 6, 7 can each have a cylindrical, in particular a hollow cylindrical, a cake-shaped, or a rectangular geometry. A "cake-shaped" geometry is understood here to mean, in particular, a flat circular cylindrical geometry.

[0061] In the Fig. 2the first sorption unit 6 is in the aforementioned sorption mode M1. The second sorption unit 7 is in the desorption mode M2. In the sorption mode M1, raw air RO loaded with CO2 and H2O from the passenger compartment 3 is supplied to the first sorption unit 6. A first blower device 10 can be provided for this purpose. The raw air RO is passed at least partially through the first sorption unit 6, with the sorbents 8, 9 cleaning the raw air RO of CO2 and H2O. The cleaned raw air RO is fed back to the passenger compartment 3 as clean air RL.

[0062] The first sorption unit 6 is assigned an optional first heating element 11, with the aid of which heat Q can be supplied to the sorbents 8, 9. In sorption mode M1, the first heating element 11 is inactive, so that it does not supply any heat Q to the first sorption unit 6. The first heating element 11 can be a heating wire passed through the first sorption unit 6, which is energized to introduce the heat Q and thus heats the sorbents 8, 9. However, the heat Q can also be introduced via any other desired route. For example, the heat Q can also be waste heat from an electric motor for driving the motor vehicle 1. The heat Q can also be waste heat from a conventional internal combustion engine, a battery cooling system, or a fuel cell cooling circuit. The first heating element 11 can also be a heat exchanger or comprise a heat exchanger.

[0063] In desorption mode M2, regeneration air R1 unladen with CO2 and H2O is supplied to the second sorption unit 7. A second blower device 12 can be used for this purpose. The term "unladen" for the unladen regeneration air R1 with CO2 and H2O means that the unladen regeneration air R1 can absorb CO2 and H2O stored in the second sorption unit 7. This means that the unladen regeneration air R1 can also have a certain content of CO2 and H2O. However, the unladen regeneration air R1 is not saturated with CO2 and H2O. The unladen regeneration air R1 can be taken, for example, from the passenger compartment 3 or the environment U.

[0064] Furthermore, an optional second heating element 13 is provided, with the aid of which the second sorption unit 7 is heated in the desorption mode M2, thus introducing heat Q into the second sorption unit 7. The first heating element 11 and the second heating element 13 are preferably constructed identically and are operated alternately. As previously mentioned, the heat Q can also be supplied, for example, in the form of waste heat from an electric motor. However, as also previously mentioned, the heat Q can also be waste heat from a conventional combustion engine, a battery cooling system, or a fuel cell cooling circuit. The second heating element 13 can also be a heat exchanger or comprise a heat exchanger.

[0065] When the sorbents 8, 9 are heated in desorption mode M2 ​​of the second sorption unit 7, they release CO2 and H2O into the unloaded regeneration air R1. This means that CO2 and H2O are desorbed. A temperature of above 55°C is preferably required for desorption. The unloaded regeneration air R1 is passed through the second sorption unit 7, absorbs CO2 and H2O there, and is discharged from the second sorption unit 7 as loaded regeneration air R2. In particular, the loaded regeneration air R2 is fed to the environment U.

[0066] The Fig. 3shows a highly schematic view of the motor vehicle 1 with the device 5. In this embodiment of the motor vehicle 1, the device 5 operates independently of the air conditioning system 4. Ambient air UL can be supplied to the passenger compartment 3 via the air conditioning system 4. The ambient air UL can be tempered with the help of the air conditioning system 4 and cleaned of suspended particles, such as dust or pollen. For this purpose, the air conditioning system 4 can comprise an interior filter. The cleaned and tempered ambient air UL is supplied to the passenger compartment 3 via a line 14 as interior air IL. The interior air IL can be fed back to the air conditioning system 4 via a line 15, for example in order to heat or cool the interior air IL in recirculation mode.

[0067] During operation of the motor vehicle 1, the interior air IL in the passenger compartment 3 becomes loaded with CO2 and H2O. The loaded interior air IL is the aforementioned raw air RO. This aforementioned raw air RO can be at least partially supplied to the environment U via a line 16. Furthermore, the raw air RO loaded with CO2 and H2O can be at least partially supplied to the device 5 via a line 17. In particular, the line 17 supplies the raw air RO to the first blower device 10. The first blower device 10 is mounted on the pressure side. However, the first blower device 10 can also be mounted on the suction side.

[0068] Downstream of the first blower device 10, a line 18 is provided, which supplies the raw air RO to an air distribution device 19. The air distribution device 19 comprises a plurality of valves 20 to 23, in particular three-way valves. The valves 20 to 23 are preferably designed as flap valves. Accordingly, the air distribution device 19 can also be referred to as a flap device or flap system.

[0069] Line 18 is fluidly connected to valve 20, which in turn is fluidly connected to the two sorption units 6, 7 via lines 24, 25. Depending on the switching position of valve 20, the raw air RO can be selectively supplied either to the first sorption unit 6 or to the second sorption unit 7. A sensor 26, in particular a CO2, H2O, and / or temperature sensor, can be provided in or on line 18. In particular, line 24 connects valve 20 to the first sorption unit 6. Line 25 connects valve 20 to the second sorption unit 7.

[0070] Downstream of the sorption units 6, 7, a valve 21 of the air distribution device 19 is provided. The valve 21 is connected to the first sorption unit 6 by means of a line 27 and to the second sorption unit 7 by means of a line 28. A line 29 connects the valve 21 to the passenger compartment 3. The line 29 can also comprise a sensor 30, in particular a CO2, H2O and / or temperature sensor. The sensor 30 can be used, for example, to detect when the sorption unit 6, 7 in sorption mode M1 is exhausted. A bypass line 31 for bypassing the sorption units 6, 7 is provided between the lines 18, 29. Furthermore, a sensor 32, in particular a pressure sensor, is also provided between the lines 18, 29, which can detect a pressure difference between the lines 18, 29.

[0071] The air distribution device 19 comprises a further valve 22, which is connected to the first sorption unit 6 via a line 33 and to the second sorption unit 7 via a line 34. A check valve 35 and a regeneration valve 36 are connected upstream of the valve 22. The regeneration valve 36 is preferably a three-way valve. The ambient air UL is supplied to the regeneration valve 36 as unladen regeneration air R1. Furthermore, the interior air IL can also be supplied to the regeneration valve 36 via a line 37 as unladen regeneration air R1.

[0072] Downstream of the sorption units 6, 7, another valve 23 of the air distribution device 19 is positioned. The valve 23 is connected to the first sorption unit 6 by means of a line 38 and to the second sorption unit 7 by means of a line 39. A line 40 connects the valve 23 to the second blower device 12. The second blower device 12 is positioned on the suction side, i.e., downstream of the sorption units 6, 7. However, the second blower device 12 can also be positioned on the pressure side, i.e., upstream of the sorption units 6, 7. The second blower device 12 releases the loaded regeneration air R2 into the environment U.

[0073] The Fig. 4 shows the motor vehicle 1 with an operating state of the device 5 in which the first sorption unit 6 is in desorption mode M2 ​​and the second sorption unit 7 is in sorption mode M1. Unlike in the Fig. 3Both blower devices 10, 12 are positioned on the pressure side. A volume flow sensor 41 can be connected upstream of the first blower device 10. A volume flow sensor 42 is also provided downstream of the regeneration valve 36.

[0074] Downstream of the second blower device 12, a further sensor 43, in particular a CO2, H2O and / or temperature sensor, is provided. Furthermore, a further sensor 44, in particular a CO2, H2O and / or temperature sensor, is also provided in or on the line 40. Furthermore, a sensor 45 is provided, which is suitable for detecting a pressure difference between the line 40 and the air distribution device 19. Each sorption unit 6, 7 is assigned a sensor 46, 47, in particular a differential pressure sensor. A sensor 48, in particular a CO2, H2O and / or temperature sensor, can also be provided in the passenger compartment 3. A bypass valve 49 is provided to activate and deactivate the bypass line 31. Furthermore, the line 40 comprises a pressure sensor 50, in particular for determining the absolute pressure.

[0075] In the Fig. 4The regeneration valve 36 is connected so that the unloaded regeneration air R1 is drawn in from the environment U and not from the passenger compartment 3. The valves 22, 23 are connected so that the unloaded regeneration air R1 is forced through the first sorption unit 6 with the aid of the second blower device 12 arranged on the pressure side. The first heating element 11 is in operation. The first sorption unit 6 releases CO2 and H2O into the unloaded regeneration air R1, which is then fed to the environment U as loaded regeneration air R2.

[0076] At the same time, the valves 20, 21 are connected such that, with the aid of the first blower device 10, raw air RO loaded with CO2 and H2O is drawn in from the passenger compartment 3 and passed through the second sorption unit 7. In the second sorption unit 7, the CO2 and H2O are adsorbed, and the unloaded clean air RL is fed back into the passenger compartment 3. The bypass valve 49 is connected such that the bypass line 31 is inactive.

[0077] The Fig. 5 shows the motor vehicle 1 with a further development of the device 5. In the Fig. 5 the first sorption unit 6 in desorption mode M2 ​​and the second sorption unit 7 in sorption mode M1. The device 5 according to the Fig. 5 differs from the device 5 according to the Fig. 4This is essentially due to the fact that the second blower device 12 is positioned on the suction side rather than on the pressure side. "Suction side" here means downstream of the sorption units 6, 7.

[0078] The Fig. 6 shows the device 5 according to Fig. 5 , wherein the first sorption unit 6 is in sorption mode M1 and the second sorption unit 7 is in desorption mode M2. The regeneration valve 36 is still switched such that the unladen regeneration air R1 is sucked in from the environment U. The valves 20, 21 of the air distribution device 19 are switched such that the raw air RO, sucked in from the passenger compartment 3 with the aid of the first blower device 10 and enriched with CO2 and H2O, is passed through the first sorption unit 6 and fed back to the passenger compartment 3 as clean air RL purified of CO2 and H2O. The bypass line 31 is inactive.

[0079] The valves 22, 23 are connected so that the unladen regeneration air R1 drawn from the environment U is drawn through the second sorption unit 7 by the second blower device 12. The second heating element 13 is in operation during this process. The second blower device 12 blows the laden regeneration air R2, enriched with CO2 and H2O, into the environment U.

[0080] The Fig. 7 shows again the device 5 according to the Fig. 5 and 6 . The first sorption unit 6 is in sorption mode M1 and the second sorption unit 7 is in desorption mode M2. In contrast to Fig. 6 However, the regeneration valve 36 is switched so that the raw air RO from the passenger compartment 3 is used as the unloaded regeneration air R1. This means that the unloaded regeneration air R1 is not sucked in from the environment U.

[0081] The Fig. 8 shows again the device 5 according to the Fig. 5 and 6. The first sorption unit 6 is in sorption mode M1 and the second sorption unit 7 is in desorption mode M2. In contrast to Fig. 6 However, the regeneration valve 36 is switched so that no unladen regeneration air R1 is drawn in from the environment U or from the passenger compartment 3. Rather, the desorption mode M2 ​​of the second sorption unit 7 takes place under vacuum or negative pressure, which is generated by the second blower device 12. The bypass line 31 is inactive in this case.

[0082] The Fig. 9 shows again the device 5 according to the Fig. 5 and 6 . The first sorption unit 6 is in sorption mode M1 and the second sorption unit 7 is in desorption mode M2. In contrast to Fig. 8However, the bypass valve 49 is switched so that the bypass line 31 is active. This means that the raw air RO is guided from the passenger compartment 3 around the sorption units 6, 7. The air from the bypass line 31 is fed back into the passenger compartment through the clean air line RL. The second sorption unit 7 is in desorption mode M2 ​​under vacuum or negative pressure, as previously described with reference to Fig. 8 explained.

[0083] The Fig. 10shows a further development of the motor vehicle 1 in which the device 5 operates independently of the air conditioning system 4 and is thus not integrated into it. The device 5 thus operates autonomously and can, for example, be installed as a standalone module in the motor vehicle 1. No direct interface is provided between the device 5 and the air conditioning system 4. The air conditioning system 4 comprises its own blower device 51, which is suitable for drawing in, tempering, and / or purifying ambient air UL from the environment or interior air IL from the passenger compartment 3.

[0084] Furthermore, the air conditioning system 4 has a valve 52, for example a flap valve, which can be switched so that either ambient air UL is drawn in from the environment U or interior air IL is drawn in from the passenger compartment 3. A cooling element 53 and a heating element 54 are provided for temperature control. Furthermore, the air conditioning system 4 can also have a filter element (not shown), for example in the form of an interior filter.

[0085] The Fig. 11 shows a further development of the motor vehicle 1 in which the device 5 is partially integrated into the air conditioning system 4. Here, the line 29, which carries the clean air RL away from the sorption units 6, 7, is not directly connected to the passenger compartment 3 but to the air conditioning system 4, in particular to the line 15, which serves the recirculation mode of the air conditioning system 4. This enables a very simple interface between the device 5 and the air conditioning system 4.

[0086] This means, in particular, that the clean air RL is not directed directly into the passenger compartment 3, but rather via the air conditioning system 4. This makes it possible, for example, to temper the clean air RL, which has been freed of CO2 and H2O. This means that a portion of the interior air IL is directed through the first sorption unit 6 as raw air RO, and another portion of the interior air IL is directed through the air conditioning system 4 in recirculation mode. Both the device 5 and the air conditioning system 4 have their own blower devices 10, 12, 51, which can, however, be synchronized.

[0087] The Fig. 12shows a further development of the motor vehicle 1 in which the device 5 is fully integrated into the air conditioning system 4. In this embodiment of the device 5, the first blower device 10 is dispensable, since in sorption mode M1, the blower device 51 of the air conditioning system 4 is used to pass the raw air RO through the corresponding sorption unit 6, 7. For this purpose, the line 29, which carries the clean air RL away from the sorption units 6, 7, is directly connected to the valve 52 of the air conditioning system 4.

[0088] Also the Fig. 13shows a further development of the motor vehicle 1 in which the device 5 is fully integrated into the air conditioning system 4. In this embodiment of the device 5, the first blower device 10 is also omitted. The bypass line 31 and the bypass valve 49 are also integrated into the air conditioning system 4. It is thus possible to draw in ambient air UL drawn in from the environment U with the aid of the blower device 51 and, depending on the switching state of the bypass valve 49, to completely bypass the sorption units 6, 7 or to completely or partially pass it through one of the sorption units 6, 7.

[0089] As the Fig. 14As shown, the two fan devices 10, 12 of the device 5 can be driven by a common drive element 55, for example, an electric motor. A first fan wheel 56 is assigned to the first fan device 10, and a second fan wheel 57 is assigned to the second fan device 12. The drive element 55 can be linearly displaceable, as shown by an arrow 58, in order to selectively couple the drive element 55 to the fan wheels 56, 57 and to decouple it from them.

[0090] The drive element 55 has three switching positions. In a first switching position, only the second impeller 57 is driven; in a second switching position, both impellers 56, 57 are driven; and in a third switching position, only the first impeller 56 is driven. A first clutch 59 can be provided between the first impeller 56 and the drive element 55, which clutch is suitable for coupling the drive element 55 to the first impeller 56 or for decoupling it from the drive element 55. A second clutch 60 can be provided between the second impeller 57 and the drive element 55, which clutch is suitable for coupling the drive element 55 to the second impeller 57 or for decoupling it from the drive element 55.

[0091] As the Fig. 15As shown, the first clutch 59 can be designed as a conical gear transmission with two conical gears 61, 62. Gear 61 is assigned to the drive element 55, and gear 62 is assigned to the first impeller 56. By axially displacing the drive element 55, the gears 61, 62 can be brought into positive engagement and disengaged again. The second clutch 60 can be constructed identically to the first clutch 59.

[0092] As the Fig. 16 As shown, the couplings 59, 60 can also be designed as cross-shaped gear transmissions. In this case, the respective coupling 59, 60 can each comprise two cross shafts 63, 64, which can be plugged into one another and pulled apart in order to couple the drive element 55 to the respective impeller 56, 57 or to decouple the respective impeller 56, 57 from the drive element 55.

[0093] As the Figs. 17 and 18As shown in the drawings, an actuated clutch 59, 60 with a first clutch element 65 and a second clutch element 66 can also be provided. The clutch elements 65, 66 can be actuated by means of an actuator (not shown) to connect or separate the clutch elements 65, 66. By using the clutches 59, 60, a drive element 55 can thus be omitted.

[0094] The Fig. 19shows a schematic block diagram of a method for operating the previously explained device 5. The method comprises the steps explained below. In a step S1, one of the two sorption units 6, 7, for example the first sorption unit 6, is switched to sorption mode M1 with the aid of the air distribution device 19 depending on the carbon dioxide and water content in the passenger compartment 3. In sorption mode M1, as previously mentioned, carbon dioxide and water are sorbed from the raw air RO of the passenger compartment 3 by the corresponding sorption unit 6, 7.

[0095] In a step S2, the other of the two sorption units 6, 7, for example the second sorption unit 7, is switched to the desorption mode M2 ​​with the aid of the air distribution device 19, in which carbon dioxide and water are desorbed from the corresponding sorption unit 6, 7 to the supplied unloaded regeneration air R1 and released into the environment U.

[0096] In a step S3, steps S1 and S2 are carried out alternately such that one of the two sorption units 6, 7 is always operated in the sorption mode M1, while the other of the two sorption units 6, 7 is operated in the desorption mode M2.

[0097] In the hydraulic circuit diagrams of the motor vehicle 1 with device 5 for the combined reduction of the carbon dioxide and water content in a limited air volume of the Fig. 20 , Fig. 21 and Fig. 22 , which each provide further training for Fig. 5 the desorption blower device 12 is again active. fat The fluid paths shown are those active in the selected switching positions.

[0098] According to Fig. 20The sorption unit 6 is in desorption mode M2 ​​and is flowed through by a regeneration air volume flow R1. Branch 401 is provided in the desorption line 40 downstream of the desorption blower device 12 on the pressure side and can be switched by means of a recirculation valve 500. The branch 401 opens into a recirculation line 510, which is fluidically connected to an inlet of the regeneration valve 36. A fourth switching position, in which the regeneration air R1 can be supplied from the recirculation line 510 to the sorption unit 6 in desorption mode, can be switched by means of the regeneration valve 36, and vice versa, so that the regeneration air R1 can be optionally recirculated through the sorption units 6, 7 or discharged into the environment by means of the desorption blower device 12.

[0099] This has advantages in terms of energy consumption, since the amount of heat introduced for regeneration is optimally used for desorption and heat losses are thus reduced.

[0100] An alternative embodiment, according to which an at least partial recirculation of the at least partially loaded recirculation air R2, ie the air volume flow which has passed the sorption unit 6, which is in desorption mode, at least once, is also possible, is described in the Fig. 21 shown.

[0101] Accordingly, a throttle valve 501, in particular an adjustable throttle valve, is arranged fluidically between the outlet of the regeneration valve and the confluence of the recirculation line and the regeneration air line. By means of this throttle valve, the proportion of freshly supplied, unladen regeneration air R1 can be adjusted. According to this embodiment, no recirculation valve 500 is provided at branch 401; instead, the branch is designed as an unswitched branch (e.g., distributor, T-piece, Y-piece, or similar). This has the advantage that the desorption of the sorption unit, which is in desorption mode, can always take place under a sufficient concentration gradient, which helps to minimize the overall regeneration time. Fig. 22An embodiment of the invention is shown, which comprises a bypass line 310 according to the invention and a bypass valve 490 according to the invention. The bypass valve 490 has two switching states, between which it can be selectively switched. According to the first switching state, regeneration air R1 can be supplied to the sorption unit 6, 7 that is in desorption mode M2. According to the second switching state, regeneration air R1 can be directed into the environment U by means of the bypass line 310, bypassing the sorption units 6, 7. This is primarily a test or calibration mode that can be used to check any sensors provided in the system. Or in the sense of an "emergency mode" if the pressure loss across one of the sorption units exceeds a predetermined limit.

[0102] The Fig. 23 and 24show the motor vehicle 1 with a further development of the device 5. In this embodiment of the motor vehicle 1, the device 5 also operates independently of the air conditioning system 4. During operation of the motor vehicle 1, the interior air IL in the passenger compartment 3 becomes loaded with CO2 and H2O. The loaded interior air IL is the previously mentioned raw air RO. The raw air RO loaded with CO2 and H2O can be at least partially fed to the device 5 and thus to the sorption units 6, 7. In particular, the raw air RO is fed to a first blower device 10. The first blower device 10 is mounted on the pressure side. However, the first blower device 10 can also be mounted on the suction side.

[0103] Downstream of the first blower device 10, a line 18 is provided, which feeds the raw air RO to an air distribution device 19. The air distribution device 19 comprises a plurality of flap units 67, 68. Accordingly, the air distribution device 19 can also be referred to as a flap device or flap system. The flap units 67, 68 can be controlled by a common flap actuator 69. A first flap unit 67 can be fluidically connected either to the first sorption unit 6 or to the second sorption unit 7. Accordingly, a second flap unit 68 can also be fluidically connected either to the first sorption unit 6 or to the second sorption unit 7.

[0104] Line 18 is in fluid communication with the air distribution device 19, which in turn is in fluid communication with the two sorption units 6, 7. Depending on the switching position of the flap units 67, 68, the raw air RO can be selectively supplied either to the first sorption unit 6 or to the second sorption unit 7. A sensor 26, in particular a CO2, H2O, and / or temperature sensor, can be provided in or on line 18.

[0105] A line 29 connects the air distribution device 19 to the passenger compartment 3. The line 29 can also include a sensor 30, in particular a CO2, H2O and / or temperature sensor. With the help of the sensor 30, it can be detected, for example, when the sorption unit 6, 7 in sorption mode M1 is exhausted. Between the lines 18, 29, a bypass line 31, in particular an adsorber bypass line, is provided for bypassing the sorption units 6, 7. Furthermore, a sensor 32, in particular a pressure sensor, is also provided between the lines 18, 29, which can detect a pressure difference between the lines 18, 29.

[0106] The device 5 comprises a regeneration valve 36. The regeneration valve 36 is preferably a three-way valve. The ambient air UL is supplied to the regeneration valve 36 as unladen regeneration air R1. Furthermore, the interior air IL can also be supplied to the regeneration valve 36 as unladen regeneration air R1 via a line 37. A check valve 35 is provided in or on the line 37.

[0107] Loaded regeneration air R2 can be released into the environment U via a line 40. The line 40 includes a volume flow sensor 42. The volume flow sensor 42 can be referred to as a desorption volume flow sensor. A second blower device 12 is provided downstream of the regeneration valve 36. The second blower device 12 is positioned on the pressure side, i.e., upstream of the sorption units 6, 7. However, the second blower device 12 can also be positioned on the suction side, i.e., downstream of the sorption units 6, 7. The second blower device 12 releases the loaded regeneration air R2 into the environment U.

[0108] A volume flow sensor 41 can be connected downstream of the first blower device 10. A volume flow sensor 42 is provided in the line 40 downstream of the air distribution device 19. Downstream of the second blower device 12, a further sensor 43, in particular a CO2, H2O and / or temperature sensor, is provided. Furthermore, a further sensor 44, in particular a CO2, H2O and / or temperature sensor, is also provided in or on the line 40. Furthermore, a sensor 45 is provided, which is suitable for detecting a pressure difference between the line 40 and the air distribution device 19. The sensor 45 is provided downstream of the sensor 43.

[0109] Each sorption unit 6, 7 is assigned a sensor 46, 47, in particular a differential pressure sensor. A sensor 48, in particular a CO2, H2O, and / or temperature sensor, can also be provided in the passenger compartment 3. A bypass valve 49 is provided to activate and deactivate the bypass line 31. Each sorption unit 6, 7 comprises a plurality of temperature sensors 70, 71. For example, four such temperature sensors 70, 71 are assigned to each sorption unit 6, 7. Each sorption unit 6, 7 can comprise a plurality of heating elements 11A, 11B, 13A, 13B. The heating elements 11A, 11B, 13A, 13B are optional. The heating elements 11A, 11B and 13A, 13B, respectively, can be arranged in a sandwich-like manner. The device 5 comprises a further line 72, in particular a regeneration bypass line. The line 72 opens into the line 40 upstream of the volume flow sensor 42. The air distribution device 19 can be bypassed using the line 72.The line 72 leads from a bypass valve 73, which is arranged downstream of the air distribution device 19, to the line 40.

[0110] Downstream of the bypass valve 73, i.e., between the bypass valve 73 and the air distribution device 19, an optional heating element 74, in particular a heat exchanger, is provided. With the help of the heating element 74, for example, waste heat from an electric motor, an internal combustion engine, or a battery cooling system can be transferred to the uncharged regeneration air R1. An optional additional heating element 75 is provided downstream of the heating element 74. The heating element 75 is arranged between the heating element 74 and the air distribution device 19. The heating element 75 is also suitable for transferring heat to the uncharged regeneration air R1. The heating element 75 can, for example, be an electric heating element.

[0111] The Fig. 23shows a switching position of the air distribution device 19, in which the first sorption unit 6 is in desorption mode M2 ​​and in which the second sorption unit 7 is in sorption mode M1. The second flap unit 68 is switched such that the raw air RO is supplied to the second sorption unit 7 by means of the first blower device 10. The first flap unit 67 is switched such that the raw air RO, purified of H2O and CO2, is now supplied to the passenger compartment 3 via line 29 as clean air RL.

[0112] As previously mentioned, the first sorption unit 6 is in desorption mode M2. For this purpose, unloaded regeneration air R1 is drawn in from the environment U via the regeneration valve 36 and the second blower device 12. The unloaded regeneration air R1 is fed to the heating element 74, which is preferably designed as a heat exchanger, and preheated. In addition, the regeneration air R1 can be further heated using the optional heating element 75 connected downstream of the heating element 74. The heated regeneration air R1 is fed to the first sorption unit 6 via the first flap unit 67 of the air distribution device 19. Optionally, the first sorption unit 6 itself can also have heating elements 11A, 11B, which are activated in desorption mode M2. However, this is not absolutely necessary. The second flap unit 68 is connected in such a way that the loaded regeneration air R2 is discharged into the environment U via the line 40.

[0113] The Fig. 24 shows a switching position of the air distribution device 19, in which the first sorption unit 6 is in sorption mode M1 and in which the second sorption unit 7 is in desorption mode M2. For this purpose, the flap units 67, 68 of the air distribution device 19 are switched accordingly. The heating element 74 and the heating element 75 are used to heat the unladen regeneration air R1 supplied to the second sorption unit 7. The heating element 74 and the heating element 75 can thus be used for the desorption mode M2 ​​of both sorption units 6, 7.

[0114] Because the heating element 74 and / or the heating element 75 are not integrated into the sorption units 6, 7, but are located upstream of them in the flow direction, namely before the inflow into the air distribution device 19, the heat input into the sorption units 6, 7 via the air flow can be more homogeneous than with in-situ heating via the electrical heating elements 11A, 11B, 13A, 13B in the sorption units 6, 7. When heated via the air flow, heat transfer occurs primarily by convection, whereas heating with the aid of the heating elements involves a high proportion of heat conduction. By using the external heating elements 74, 75, desorption occurs more quickly. Furthermore, the completion of desorption mode M2 ​​can be more easily measured, whereby the final criterion for the completion of desorption is that the inlet temperature is equal to the outlet temperature.A further advantage is that only one heating element 74 or only one heating element 75 is required, which can heat both sorption units 6, 7.

[0115] Reference symbols used: 1Motor vehicle 2Body 3Defined air volume / passenger compartment 4Air conditioning system 5Device 6Sorption unit 7Sorption unit 8Sorbent 9Sorbent 10Blower device 11Heating element 11AHeating element 11BHeating element 12Blower device 13Heating element 13AHeating element 13BHeating element 14Line 15Line 16Line 17Line 18Line 19Air distribution device 20Valve 21Valve 22Valve 23Valve 24Line 25Line 26Sensor 27Line 28Line 29Line 30Sensor 31Bypass line 310Bypass line 32Sensor 33Line 34Line 35Check valve 36Regeneration valve 360Regeneration air line 37Line 38Line 39Line 40(Desorption) line 401Branch of the desorption line 41Volume flow sensor 42Volume flow sensor 43Sensor 44Sensor 45Sensor 46Sensor 47Sensor 48Sensor 49Bypass valve 490Bypass valve 50Pressure sensor 500Recirculation valve 501Throttle valve,adjustable 510Recirculation line 51Blower device 52Valve 53Cooling element 54Heating element 55Drive element 56Blower wheel 57Blower wheel 58Arrow 59Coupling 60Coupling 61Gear 62Gear 63Cross shaft 64Cross shaft 65Coupling element 66Coupling element 67Flap unit 68Flap unit 69Flap actuator 70Temperature sensor 71Temperature sensor 72Line 73Bypass valve 74Heating element 75Heating element , ILindoor air M1sorption mode M2desorption mode RLReduced air ROraw air R1unloaded regeneration air R2loaded regeneration air S1step S2step S3step Uambient ULambient air QHeat

Claims

1. An apparatus (5) for a combined reduction of carbon dioxide and water content in a delimited air volume (3), in particular in a passenger compartment of a motor vehicle (1), having a first sorption unit (6) for combined sorption of carbon dioxide and water, a second sorption unit (7) for a combined sorption of carbon dioxide and water, wherein the first sorption unit (6) and the second sorption unit (7) each contain a plurality of sorbents (8, 9), wherein the sorption units (6, 7) are each convertible from a sorption mode (M1), in which the sorption units (6, 7) sorb carbon dioxide and water from raw air (RO) of the delimited air volume (3), to a desorption mode (M2), in which the sorption units (6, 7) desorb carbon dioxide and water to supplied regeneration air (R1), and vice versa, and an air distribution device (19), with the aid of which the sorption units (6, 7) can be switched alternately from the sorption mode (M1) to the desorption mode (M2) and vice versa in such a way in dependence on the carbon dioxide and water content in the delimited air volume (3) in that, in at least one operating state of the apparatus (5), one of the two sorption units (6, 7) is in the sorption mode (M1), while the other of the two sorption units (6, 7) is in the desorption mode (M2), wherein in the desorption mode (M2) the regeneration air (R1) conveyed through the sorption unit (6, 7), which is in the desorption mode, can be supplied as charged regeneration air (R2) to an environment (U), in particular via a desorption line (40), and wherein the regeneration air (R1) is extractable from the delimited air volume (3) or the environment (U), further comprising at least a heating element (11, 11A, 11B, 13, 13A, 13B, 74, 75) for introducing heat (Q) into that sorption unit (6, 7) which is in the desorption mode (M2), wherein a heating element (11, 11A, 11B, 13, 13A, 13B) is allocated to each sorption unit (6, 7), further comprising a bypass line (310) and a bypass valve (490) which can be selectively switched from a first switching state, in which the regeneration air (R1) of that sorption unit (6, 7) which is in the desorption mode (M2), into a second switching state, in which the regeneration air (R1) can be guided into the environment (U) with the aid of the bypass line (310) while bypassing the sorption units (6, 7), and vice versa.

2. The apparatus according to claim 1, wherein the air distribution device (19) features a plurality of valves (20-23) which are switchable in such a way that, during operation of the apparatus (5), that sorption unit (6, 7) which is in the sorption mode (M1) can be supplied with the raw air (RO) from the delimited air volume (3) in order to remove the carbon dioxide and the water from the raw air (RO), and that sorption unit (6, 7) which is in the desorption mode (M2) can be supplied with the regeneration air (R1) in order to remove the carbon dioxide and the water from the sorption unit (6, 7).

3. The apparatus according to claim 1 or 2, wherein a heating element (11, 11A, 11B, 13, 13A, 13B) is integrated into each sorption unit (6, 7).

4. The apparatus according to claim 1 or 2, wherein the sorption units (6, 7) feature a common heating element (74, 75).

5. The apparatus according to one of the claims 1 to 4, further comprising a regeneration valve (36) featuring a first switching position, in which the regeneration air (R1) can be supplied from an environment (U) of the delimited air volume (3) to the sorption unit (6, 7) in the desorption mode (M2), a second switching position in which the regeneration air (R1) can be supplied from the delimited air volume (3) to the sorption unit (6, 7) in the desorption mode (M2), and in particular a third switching position in which the sorption unit (6, 7) in the desorption mode (M2) can be regenerated under vacuum.

6. The apparatus according to one of the claims 1 to 5, further comprising a blowing means (10) which supplies the raw air (RO) to that sorption unit (6, 7) which is in the sorption mode (M1).

7. The apparatus according to claim 6, wherein the blowing means (10, 51) is part of an air-conditioning system (4).

8. The apparatus according to one of the claims 1 to 7, further comprising a desorption blower means (12) which supplies the regeneration air (R1) to that sorption unit (6, 7) which is in the desorption mode (M2), wherein the desorption blower means (12) is disposed on the pressure side or on the suction side with respect to the sorption units (6, 7).

9. The apparatus according to one of the claims 1 to 8, further comprising at least one additional bypass line (31) and at least one additional bypass valve (49) which can be selectively switched from a first switching state, in which the raw air (RO) can be supplied to that sorption unit (6, 7) which is in the sorption mode (M1), into a second switching state, in which the raw air (RO) can be guided back into the delimited air volume (3) with the aid of the additional bypass line (31) around the sorption units (6, 7), and vice versa.

10. The apparatus according to claim 8, wherein a branch (401) is provided in the desorption line (40) downstream of the desorption blower means (12) on the pressure side, said branch opening into a recirculation line (510) which is fluidically connected to an inlet of a regeneration valve (36) or leads downstream of an outlet of the regeneration valve (36) into a regeneration air line (360) connected to the outlet.

11. The apparatus according to claim 10, wherein the branch (401) is switchable by means of a recirculation valve (500), so that by means of the desorption blower means (12) the regeneration air (R1) can be selectively recirculated through the sorption units (6, 7) or directed into the environment (U).

12. The apparatus according to claim 10 or 11, wherein the recirculation line (510) is fluidically connected to the regeneration valve (36), wherein a fourth switching position, in which the sorption unit (6, 7) is in desorption mode (M2), can be supplied with the regeneration air (R1) from the recirculation line (500), and can be switched vice versa by means of the regeneration valve (36).

13. The apparatus according to claim 10 or 11, wherein a throttle valve, in particular an adjustable throttle valve (501), is fluidically disposed between the outlet of the regeneration valve (36) and the opening of the recirculation line (510) into the regeneration air line (360).

14. The apparatus according to one of the claims 1 to 13, wherein the sorption units (6, 7) are adapted to remove also fine particles, nitrogen oxides and / or volatile organic compounds from the raw air (RO) in addition to carbon dioxide and water.

15. The apparatus according to claim 14, wherein the sorption units (6, 7) feature a first sorbent (8) suitable for adsorbing carbon dioxide, a second sorbent (9) suitable for adsorbing water, and further sorbents suitable for removing fine particles, nitrogen oxides and / or volatile organic compounds from the raw air (RO), wherein the further sorbents are preferably introduced between two carrier layers, in particular of a non-woven fabric, or wherein the sorbents (8, 9) and the further sorbents are combined with each other.

16. A motor vehicle (1) having an apparatus (5) according to one of the claims 1 to 15, wherein the apparatus (5) is controllable based on an occupancy state of the delimited air volume (3) with passengers in order to maintain the carbon dioxide and water content in the delimited air volume (3) within a predetermined margin of tolerance regardless of the occupancy state.

17. A method for operating an apparatus (5) for a combined reduction of carbon dioxide and water content in a delimited air volume (3), in particular in a passenger compartment of a motor vehicle (1), wherein the apparatus (5) features a first sorption unit (6) for a combined sorption of carbon dioxide and water, a second sorption unit (7) for a combined sorption of carbon dioxide and water, and an air distribution device (19) for alternately switching the sorption units (6, 7) from a sorption mode (M1) to a desorption mode (M2) and vice versa, wherein the method features the following steps: a) switching (S1) one of the two sorption units (6, 7) as a function of the carbon dioxide and water content in the delimited air volume (3) with the aid of the air distribution device (19) into the sorption mode (M1) in which carbon dioxide and water are sorbed by the sorption unit (6, 7) from raw air (RO) of the delimited air volume (3), b) switching (S2) the other of the two sorption units (6, 7) with the aid of the air distribution device (19) into the desorption mode (M2), in which carbon dioxide and water are desorbed from the sorption unit (6, 7) to supplied regeneration air (R1), and c) alternately carrying out (S3) steps a) and b) in such a way that, in at least one operating state, one of the two sorption units (6, 7) is operated in the sorption mode (M1), while the other of the two sorption units (6, 7) is operated in the desorption mode (M2), wherein the desorption mode (M2) is carried out with regeneration air (R1) taken from an environment (U) of the delimited air volume (3), with regeneration air (R1) taken from the delimited air volume (3), under vacuum or by recirculation, and wherein heat (Q) is introduced into that sorption unit (6, 7) which is operated in the desorption mode (M2), wherein the apparatus (5) for a combined reduction of the carbon dioxide and water content further comprises at least a heating element (11, 11A, 11B, 13, 13A, 13B, 74, 75) for introducing heat (Q) into that sorption unit (6, 7) which is in the desorption mode (M2), wherein a heating element (11, 11A, 11B, 13, 13A, 13B) is allocated to each sorption unit (6, 7), further comprising a bypass line (310) and a bypass valve (490) which can be selectively switched from a first switching state, in which the regeneration air (R1) of that sorption unit (6, 7) which is in the desorption mode (M2), into a second switching state, in which the regeneration air (R1) can be guided into the environment (U) with the aid of the bypass line (310) while bypassing the sorption units (6, 7), and vice versa.

18. The method according to claim 17, wherein in the delimited air volume (3) the carbon dioxide and water content is measured in order to control the apparatus (5) in such a way that the carbon dioxide and the water content in the delimited air volume (3) is kept within a predetermined margin of tolerance.

19. The method according to claim 18, wherein an occupancy state of the delimited air volume (3) having passengers is detected in order to control the apparatus (5) to maintain the carbon dioxide and water content in the delimited air volume (3) within the predetermined margin of tolerance regardless of the occupancy state.