Fragrance delivery duct for a vehicle

Abstract

A fragrance delivery duct 52 for a vehicle comprises: an inlet end 54 to receive a flow of fragrance-entrained air from a fragrance delivery unit (12, figure 10); an outlet end 56 to supply the flow o

Description

TECHNICAL FIELD The present disclosure relates to a fragrance delivery duct for a vehicle. Aspects of the invention relate to a fragrance delivery duct, a fragrance delivery system, a glovebox assembly, an instrument panel, an air flow system, and a vehicle. BACKGROUND It is known to use air fresheners which passively release a fragrance to provide a pleasant smell inside a vehicle cabin and / or to mask odours in the cabin. For example, an air freshener may be suspended from a rear-view mirror (e.g., using string). Alternatively, an air freshener may be clipped to a structure adjacent to a HVAC outlet (e.g., to a baffle which overlaps the HVAC outlet). More recently, some vehicles have included a fragrance delivery system which has one or more components designed to actively distribute fragrance inside the vehicle cabin. For example, a known fragrance delivery system includes a fragrance delivery unit which receives a fragrance cartridge containing a fragrant substance, and a blower unit configured to blow fragrance-entrained air from the fragrance delivery unit around the vehicle cabin. It is an aim of the present invention to address one or more of the disadvantages associated with the prior art. SUMMARY OF THE INVENTION Aspects and embodiments of the invention provide a fragrance delivery duct, a fragrance delivery system, a glovebox assembly, an instrument panel, an air flow system and a vehicle as claimed in the appended claims. According to an aspect of the present invention there is provided a fragrance delivery duct for a vehicle. The fragrance delivery duct comprises: an inlet end configured to receive a flow of fragrance-entrained air from a fragrance delivery unit; an outlet end for supplying the flow of fragrance-entrained air to a vehicle cabin; and a conduit which extends from the inlet end to the outlet end. The outlet end is configured to guide the flow of fragrance-entrained air flowing along the conduit into a vehicle cabin in separate first and second fragrance flow streams. The separate first and second fragrance flow streams may be spaced apart from each other in a transverse direction. In other words, the outlet end may define first and second separate flow paths which are spaced apart in a transverse direction. Having an outlet end of the fragrance delivery duct configured to guide the flow of fragrance-entrained air flowing along the conduit into a vehicle cabin in separate first and second fragrance flow streams which are spaced apart from each other in a transverse direction may facilitate improved distribution of fragrance around the vehicle cabin. In this context, the term “transverse direction” will be understood to refer to a direction which is transverse to the general direction of the fragrance flow streams. This may be a vertical direction and / or a lateral direction. The outlet end may be configured to guide the flow of fragrance-entrained air flowing along the conduit into a vehicle cabin in separate first and second fragrance flow streams which are spaced apart from each other in a lateral direction. In other words, the outlet end may define first and second separate flow paths which are spaced apart in a lateral direction. Having an outlet end of the fragrance delivery duct configured to guide the flow of fragrance-entrained air flowing along the conduit into a vehicle cabin in separate first and second fragrance flow streams which are spaced apart from each other in a lateral direction may facilitate even distribution of fragrance around the vehicle cabin. Furthermore, it has been found that this effect may be achieved even if the fragrance delivery duct is not located centrally within the vehicle. This provides greater flexibility in the positioning of the fragrance delivery duct within the vehicle, which facilitates simpler packaging of vehicle components and / or reduced length of the conduit. In this context, the term “lateral direction” will be understood to refer to a direction which is transverse to the general direction of the fragrance flow streams in a horizontal direction. In other words, where the fragrance duct is positioned so that the fragrance flow streams are in a generally rearward direction into a vehicle cabin, the lateral direction may be a sideways direction of the vehicle (e.g., in a direction from a left side to a right side of the vehicle cabin). Similarly, where the fragrance duct is positioned so that the fragrance flow streams are in a generally sidewards direction into a vehicle cabin, the lateral direction may be a longitudinal direction of the vehicle. The outlet end of the fragrance delivery duct may be configured to directly supply the flow of fragrance-entrained air to a vehicle cabin. In other words, the flow of fragrance-entrained air leaves the outlet end of the fragrance delivery duct and enters the vehicle cabin without first passing through any other ducts, conduits or similar passageways. Optionally, the fragrance delivery duct is configured to receive only the flow of fragrance-entrained air from the fragrance delivery unit. For example, the inlet end of the fragrance delivery duct may have only a single inlet by which a flow of fragrance-entrained air can be received into the fragrance delivery duct. Optionally, the outlet end defines separate and divergent first and second fragrance flow paths. In other words, the first and second fragrance flow paths may be non-parallel and a lateral distance between the first and second fragrance flow paths may increase in the direction of the flow of fragrance-entrained air along the conduit. It will be understood that with this arrangement the flow of fragrance-entrained air flowing along the divergent first and second fragrance flow paths will be guided into the vehicle cabin in separate first and second flow streams which are also divergent, as well as spaced apart from each other in a lateral direction. This may facilitate a particularly even distribution of fragrance throughout the vehicle cabin. Optionally, the first and second fragrance flow paths are defined by first and second outlets respectively. Optionally, the first and second outlets define respective central axes which are arranged at an angle relative to each other along a horizontal plane. Optionally, the angle is in the range of 30 to 150 degrees, optionally in the range of 45 to 135 degrees, optionally in the range of 60 to 120 degrees. This may facilitate a particularly even distribution of fragrance throughout the vehicle cabin. Optionally, the conduit comprises a main conduit body and the first and second outlets branch off from the main conduit body. Such separate first and second outlets provide a simple means of directing flow along separate first and second flow streams. Alternatively, or in addition, the conduit may comprise one or more baffles provided inside the conduit proximal to the outlet end in order to direct flow along separate first and second flow paths to the separate first and second flow streams. This provides an alternative means for dividing the conduit at the outlet end and / or may facilitate separation of the flow of fragrance-entrained air into first and second streams. Optionally, a cross-sectional width of the conduit increases towards the outlet end and / or a cross-sectional height of the conduit decreases towards the outlet end. This may facilitate spreading flow outwards in different directions towards the first and second separate flow streams. With this arrangement, the cross-sectional area of the conduit may be maintained, or even reduced, despite an increase in width. This may be beneficial for maintaining flow rates along the conduit and ensuring appropriate flow velocities and direction from the outlet end. Optionally, the conduit comprises a transition region over which the cross-sectional area of the conduit simultaneously decreases in height and increases in width. Such a transition region facilitates a smooth transition which may help to maintain flow velocities along the conduit. Optionally, the cross-sectional area of the fragrance delivery duct is substantially constant along the length of the fragrance delivery duct whilst the cross-sectional height and width vary along the length of the fragrance delivery duct. Such a transition region facilitates a smooth transition which may help to maintain flow velocities along the conduit. Optionally, the first and second fragrance flow streams are spaced apart from each other in the lateral direction by a distance of at least 0.25 cm, optionally at least 0.5 cm, optionally at least 0.75 cm, optionally at least 1 cm, optionally at least 1.5 cm, optionally at least 2 cm, optionally at least 3 cm, optionally at least 4 cm, optionally at least 5 cm, optionally at least 6 cm, optionally at least 8 cm, optionally at least 10 cm, optionally at least 12 cm, optionally at least 15 cm, optionally at least 20 cm, optionally at least 30 cm, optionally at least 40 cm, optionally at least 50 cm. This may facilitate a particularly even distribution of fragrance throughout the vehicle cabin. Optionally, the fragrance delivery duct is unitary, i.e., formed as a single piece. In other words, the inlet end, outlet end and conduit may all be integrally formed. This may simplify manufacturing as the fragrance delivery duct can be installed in a fragrance delivery system simply by coupling the inlet end to a fragrance delivery unit without having to connect multiple parts. This can also reduce the risk of leakage of fragrance-entrained air from joints along the length of the fragrance delivery duct. This can be beneficial for maximising fragrance delivery to the cabin and avoiding the potential build-up of fragrance condensates on internal surfaces. Optionally, the fragrance delivery duct is rigid. In other words, the fragrance delivery duct may be capable of maintaining its shape if supported only at one end. This can facilitate assembly of the duct within a vehicle and can help to ensure correct orientation of the first and second outlets. Optionally, the inlet end comprises a snap-fit formation for engaging a corresponding snap-fit formation on an outlet of a fragrance delivery unit. Such a snap-fit formation (e.g., a recess for receiving a projection or a projection for locating in a recess) may simplify assembly of a fragrance delivery system including the fragrance delivery duct and a fragrance delivery unit. Optionally, the conduit comprises a bend between the inlet end and the outlet end. Optionally, the bend is configured to change the direction of air flowing along the conduit by at least 90 degrees. Such a bend allows the fragrance delivery to be connected to a surface of a fragrance delivery unit other than the passenger-facing surface (which can be kept free for access by user - e.g., for changing fragrance cartridges). Alternatively, or in addition, such a bend may facilitate a change of height of the outlet end relative to the inlet end when installing the fragrance delivery duct in a vehicle. According to a further aspect of the present invention there is provided a fragrance delivery system. The fragrance delivery system comprises a fragrance delivery unit configured to supply a flow of fragrance-entrained air. The fragrance delivery system also comprises a fragrance delivery duct as disclosed herein. The inlet end of the fragrance delivery duct may be coupled to a fragrance delivery unit outlet of the fragrance delivery unit for receiving the flow of fragrance-entrained air from the fragrance delivery unit. Such a fragrance delivery system benefits from the advantages of the fragrance delivery duct outlined above. Optionally, the fragrance delivery unit comprises a blower unit configured to entrain the fragrant substance in a flow of air and to deliver the flow of fragrance-entrained air to the outlet. The fragrance delivery unit may be configured to supply a flow of fragrance-entrained air without heating, cooling or air conditioning the flow of air. In otherwords, the fragrance delivery unit may not perform any HVAC functions. The fragrance delivery unit may be configured to re-circulate air from the vehicle cabin (e.g., without heating, cooling or air conditioning the flow of air). Optionally, the fragrance delivery unit is configured to supply a flow of fragrance-entrained air through the fragrance delivery unit outlet at a volumetric flow rate in the range of 0.1 to 1.5 l / s, optionally in the range of 0.25 to 1 l / s. Such a flow rate may facilitate even distribution of fragrance around the vehicle cabin, particularly when combined with the feature of the outlet end being configured to guide fragrance-entrained air flowing along the conduit into the vehicle cabin in at least two directions. According to a further aspect of the invention, there is provided a glovebox assembly. The glovebox assembly comprises: a glovebox body which defines a glovebox interior for storing objects; and a fragrance delivery system as disclosed herein. The fragrance delivery unit and / or fragrance delivery duct may be mounted to the glovebox body. Such a glovebox assembly benefits from the advantages of the fragrance delivery duct and fragrance delivery system outlined above. In addition, as the glovebox body defines a glovebox interior (i.e., one or more voids for storing objects), mounting the fragrance delivery duct and / or fragrance delivery unit to the glovebox body may simplify packaging in comparison to mounting to other parts of the vehicle with a denser packaging of components. Optionally, the fragrance delivery unit may be mounted to the glovebox body such that at least part of the fragrance delivery unit is accessible from the glovebox interior. For example, such that a fragrance storage compartment of the fragrance delivery unit is accessible from the glovebox interior. Furthermore, a glovebox assembly may be manufactured as a separate module for installing in an instrument panel, and so providing the fragrance delivery system as part of a glovebox assembly facilitates a modular design. In this way, a modular production line may be used which allows the glovebox assembly to be installed in some vehicles (e.g., in vehicles where the fragrance delivery system has been selected as an upgrade option), and for an alternative glovebox assembly to be installed in other vehicles (e.g., in vehicles without the fragrance delivery system upgrade), without having to change the design of the rest of the instrument panel. According to a further aspect of the invention, there is provided an instrument panel. The instrument panel comprises a steering wheel mounting location and a fragrance delivery system as disclosed herein. The outlet end of the fragrance delivery duct may be located on an opposite side of the instrument panel to the steering wheel mounting location. Optionally, the instrument panel comprises a glovebox assembly as disclosed herein positioned on an opposite side of the instrument panel to the steering wheel mounting location. Such an instrument panel benefits from the advantages of the fragrance delivery duct and / or fragrance delivery system and / or glovebox assembly outlined above. In addition, the outlet end of the fragrance delivery duct being located on an opposite side of the instrument panel to the steering wheel mounting location may provide a simpler packaging arrangement than if the outlet end of the fragrance delivery duct was proximal to the steering wheel mounting location. Further, an even distribution of fragrance may still be achieved in this position of the outlet end because it is configured to guide fragrance-entrained air flowing along the conduit into the vehicle cabin in separate first and second fragrance flow streams which are spaced apart from each other in the lateral direction. According to a further aspect of the invention, there is provided an air flow system. The air flow system comprises: a fragrance delivery system as disclosed herein; and a HVAC system comprising a HVAC unit configured to supply a flow of HVAC air to a plurality of HVAC outlets each being positioned to provide a respective HVAC flow stream in a vehicle cabin. The outlet end of the fragrance delivery duct may be positioned to direct the first and second fragrance flow streams towards at least two different HVAC flow streams to each other. Such an air flow system benefits from the advantages of the fragrance delivery duct and / or fragrance delivery system outlined above. In addition, the outlet end of the fragrance delivery duct being positioned to direct the first and second fragrance flow streams towards at least two different HVAC flow streams to each other may facilitate an even distribution of fragrance around the vehicle cabin, because the streams of fragrance-entrained air may be propelled around the vehicle cabin by the flows of HVAC air. Optionally, the plurality of HVAC outlets are positioned to provide at least one first HVAC flow stream on a first lateral side of the vehicle cabin and at least one second HVAC flow stream on a second lateral side of the vehicle cabin, wherein the outlet end of the fragrance delivery duct is positioned to direct the first fragrance flow stream towards the at least one first HVAC stream and to direct the second fragrance flow stream towards the at least one second HVAC stream. The HVAC system may be a separate air flow system to the fragrance delivery system. In other words, the HVAC unit may supply a flow of HVAC air along one or more HVAC ducts to the HVAC outlets, and the fragrance delivery duct may be separate to the HVAC ducts. Put another way, a flow of HVAC air which is supplied by the HVAC unit may not flow along the fragrance delivery duct. Similarly, a flow of fragrance-entrained air which is supplied by the fragrance delivery unit may not flow along the HVAC ducts. According to a further aspect of the invention, there is provided a vehicle comprising a fragrance delivery duct as disclosed herein and / or a fragrance delivery system as disclosed herein and / or a glovebox assembly as disclosed herein and / or an instrument panel as disclosed herein and / or an airflow system as disclosed herein. Such a vehicle benefits from the advantages of the fragrance delivery duct and / or fragrance delivery system and / or glovebox assembly and / or instrument panel and / or air flow system outlined above. Within the scope of this application, it is expressly intended that the various aspects, embodiments, examples and alternatives set out in the preceding paragraphs, in the claims and / or in the following description and drawings, and in particular the individual features thereof, may be taken independently or in any combination. That is, all embodiments and / or features of any embodiment can be combined in any way and / or combination, unless such features are incompatible. The applicant reserves the right to change any originally filed claim or file any new claim accordingly, including the right to amend any originally filed claim to depend from and / or incorporate any feature of any other claim although not originally claimed in that manner. BRIEF DESCRIPTION OF THE DRAWINGS One or more embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 shows a schematic plan view of a vehicle in accordance with an embodiment of the invention; Figure 2 shows a schematic front view of a fragrance delivery system of the vehicle of Figure 1; Figure 3 shows a schematic front view of a touchscreen and user inputs of the fragrance delivery system of Figure 2; Figure 4 shows a schematic view of a control system of the fragrance delivery system of Figure 2; Figure 5 shows a perspective view of a glovebox area of the vehicle of Figure 1; Figures 6A and 6B show perspective views of a fragrance delivery unit of the fragrance delivery system of Figure 2; Figure 7 shows a perspective view of a fragrance delivery duct in accordance with an embodiment of the invention; Figure 8 shows an enlarged view of an outlet end of the fragrance delivery duct of Figure 7; Figures 9A and 9B show perspective cross-sectional views through planes A-A and B-B of Figure 7, respectively; Figure 10 shows a fragrance delivery system in accordance with an embodiment of the invention; Figure 11 shows an instrument panel in accordance with an embodiment of the invention; Figure 12 shows a cross-sectional view through plane C-C of Figure 11; and Figures 13 and 14 show plan views of a vehicle in accordance with an embodiment of the invention, with fragrance flow lines illustrating the distribution of fragrance-entrained air within the vehicle cabin in different operating modes. DETAILED DESCRIPTION A fragrance delivery system in accordance with an embodiment of the present invention is described herein with reference to the accompanying Figures 2 to 6A. As shown in Figure 1, the fragrance delivery system is installed in a vehicle 1000. With reference to Figures 1 and 2, there is illustrated a vehicle 1000 with a vehicle cabin 1002. The vehicle 1000 includes an instrument panel ordashboard area 1004 inside the vehicle cabin 1002. The dashboard area 1004 has a steering wheel 1006, a centre console 1008, and a fragrance delivery system 10. As will be described in more detail below, the fragrance delivery system 10 has a fragrance delivery unit 12 which is configured to supply fragrance-entrained air along a fragrance flow path 14 into the vehicle cabin 1002. In the illustrated arrangement, the steering wheel 1006 is provided on a left-hand side of the centre console 1008 and the fragrance delivery unit 12 is provided on a right-hand side of the centre console 1008 in a glovebox assembly 1010 of the vehicle 1000. In alternative arrangements, the steering wheel 1006 and / or fragrance delivery unit 12 are provided on the opposite sides of the centre console 1008 to that shown. In some arrangements, the steering wheel 1006 and fragrance delivery unit 12 are provided on the same side of the centre console 1008. In some arrangements, the fragrance delivery unit 12 is provided in a central region of the dashboard area 1004. The centre console 1008, or another part of the dashboard 1004 or the vehicle more generally, may include a user input device for the fragrance delivery system 10 by which one or more user inputs 16 may be provided to the fragrance delivery system 10. The user input device may be a touchscreen 18, for which the one or more inputs 16 may be provided as icons on the touchscreen 18, and / or as manual switches, buttons or other controls. As shown in Figure 3, the one or more user inputs 16 may include: a power input 16a configured to turn the fragrance delivery system 10 on or off; a fragrance compartment control input 16b configured to open or close a fragrance storage compartment 22 of the fragrance delivery unit 12 (as described in more detail below); one or more fragrance selection inputs 16c which allow a particular fragrance and / or combination of fragrances to be selected; one or more fragrance intensity inputs 16d which allow an intensity of one or more fragrances to be selected; and / or an instruction input 16e configured to output visual and / or audible instructions for operating the fragrance delivery system 10. Any other suitable user inputs may also be provided. In the illustrated arrangement, there are three fragrance selection inputs 16c which correspond to three different fragrance cartridges 24 (which will be described in more detail below with respect to Figs. 6A and 6B). It will be understood that in fragrance delivery systems 10 including greater or less than three fragrance cartridges 24, the number of fragrance selection inputs 16c may vary accordingly. Where only a single fragrance cartridge 24 is provided, the fragrance selection inputs 16c may be omitted entirely. Similarly, the fragrance compartment control input 16b may be omitted (e.g., in arrangements where the fragrance storage compartment 22 can be manually opened and closed). Similarly, the fragrance intensity inputs 16d may be omitted (e.g., in arrangements where the fragrance delivery system 10 only has a single fragrance intensity level, or arrangements which automatically control the fragrance intensity level). Similarly, the instruction input 16e may be omitted. In some arrangements, the fragrance delivery system 10 may be operated automatically and the user inputs 16 and user input device may be omitted entirely. In some arrangements, the fragrance delivery system 10 may be operated remotely (e.g., via an app on a mobile device). In some embodiments, the fragrance delivery system 10 may be operated by voice control (e.g., including a microphone which sends an input signal to a controller configured to perform voice recognition on the input signal to determine a requested setting of the fragrance delivery system 10). Referring to Figures 2 and 4, the fragrance delivery system 10 includes a control system 200. The control system 200 includes one or more controllers 210. The control system 200 may be configured to receive one or more input signals 260 (e.g., from the one or more user inputs 16) and to determine a desired fragrance delivery setting based on the one or more input signals 260. The control system 200 may then output one or more control signals 270 to the fragrance delivery unit 12 to control the output of fragrance-entrained air from the fragrance delivery unit 12. The control system 200 as illustrated in Figures 2 and 4 comprises one controller 210, although it will be appreciated that this is merely illustrative. The controller 210 comprises processing means 220 and memory means 230. The processing means 220 may be one or more electronic processing devices which operably execute computer-readable instructions. The memory means 230 may be one or more memory devices. The memory means 230 may be electrically coupled to the processing means 220. The memory means 230 may be configured to store instructions, and the processing means 220 may be configured to access the memory means 230 and execute the instructions stored thereon. The controller 210 comprises an input means 240 and an output means 250. The input means 240 may comprise an electrical input of the controller 210. The output means 250 may comprise an electrical output of the controller 210. The input means 240 is arranged to receive one or more input signals 260 from the one or more user inputs 16. The one or more input signals 260 may be electrical signals which are indicative of a one or more desired settings of the fragrance delivery system 10. The output means 250 is arranged to output one or more control signals 270 for controlling one or more components of the fragrance delivery unit 12 in order to control the output of fragrance-entrained air from the fragrance delivery unit 12. For example, the output means 250 may output a control signal 270 to a blower unit 26 of the fragrance delivery unit 12 (as illustrated schematically in Figure 6B) in response to a user instruction made via the power input 16a and / or one or more of the fragrance intensity inputs 16d. The output means 250 may output a control signal 270 to a fragrance delivery mechanism 36 of the fragrance delivery unit 12 (as illustrated schematically in Figure 6B) in response to a user instruction made via one or more of the fragrance selection inputs 16c. The output means 250 may output a control signal 270 to a compartment drive mechanism 38 of the fragrance delivery unit 12 (as illustrated schematically in Figure 6A) in response to a user instruction made via the fragrance compartment control input 16b. Referring now to Figure 5, the glovebox assembly 1010 of the vehicle 1000 is shown in more detail. The glovebox assembly 1010 includes a glovebox body 1012 which defines a glovebox interior 1014 for storing objects, such as driving gloves. The glovebox assembly 1010 also includes a glovebox closure 1016 which is coupled to the glovebox body 1012 by a hinge arrangement 1018. In this way, the glovebox closure 1016 is pivotal between an open state (illustrated in Figure 5) in which the glovebox interior 1014 is accessible for insertion and / or removal of objects, and a closed state (not illustrated) in which the glovebox interior 1014 is covered by the glovebox closure 1016. In the illustrated arrangement, the fragrance delivery unit 12 is provided in the glovebox assembly 1010. In particular, the fragrance delivery unit 12 may be provided in a recess 1020 in a rear of the glovebox body 1012 such that at least part of the fragrance delivery unit 12 is accessible from the glovebox interior 1014. For example, the fragrance storage compartment 22, described in more detail below, may be opened and closed by sliding through the recess 1020. In this way, the fragrance delivery unit 12 may be accessed by moving the glovebox closure 1016 to the open state. In alternative arrangements, the fragrance delivery unit 12 may be positioned elsewhere. For example, the glovebox body 1012 may not have a recessed region 1020, and the fragrance delivery unit 12 may instead be positioned fully inside the glovebox interior 1014. Alternatively, the fragrance delivery unit 12 may be positioned in, and directly accessible from, a front or lower region of the dashboard area 1004. Alternatively, the fragrance delivery unit 12 may be positioned in any other suitable location in the vehicle cabin 1002. Referring now to Figures 6A and 6B, the fragrance delivery unit 12 is shown in more detail. The fragrance delivery unit 12 has a housing 20 and a fragrance storage compartment 22 which is configured to receive one or more fragrant substances (e.g., contained in one or more fragrance cartridges 24). The fragrance delivery unit 12 also includes a blower unit 26 (shown schematically on Figure 6B) which is configured to drive a flow of air through the fragrance delivery unit 12. In particular, the blower unit 26 may drive a flow of air through or past the one or more fragrant substances in the fragrance storage compartment 22 to entrain fragrance in the flow of air before being expelled through a fragrance delivery unit outlet 28. The fragrance delivery unit outlet 28 may be connected to a duct arrangement (not shown in Figures 6A and 6B) for guiding the fragrance-entrained air along a flow path 14 into the vehicle cabin 1002. The blower unit 26 may be controlled by a control signal 270 from the controller 210 of the control system 200 described above (e.g., in response to the power input 16a and / or one or more fragrance intensity inputs 16d being operated by the user). In the illustrated arrangement, the fragrance delivery unit outlet 28 is provided on an upper surface 30 of the housing 20. In alternative arrangements, the fragrance delivery unit outlet 28 may be provided on a side surface 32 or a lower surface 34 of the housing 20. In the illustrated arrangement, the fragrance storage compartment 22 is configured to receive a plurality of fragrance cartridges 24. The fragrance cartridges 24 may each contain a fragrant substance, for example in the form of a liquid fragrance stored in a reservoir and / or absorbed in a porous ceramic block within each cartridge. The fragrance cartridges 24 may each contain a different fragrant substance, so that a user can choose different fragrances and / or combinations thereof. Alternatively, the fragrance cartridges 24 may all contain the same fragrant substance, with the plurality of fragrance cartridges 24 providing a greater capacity for the fragrant substance than a single similarly sized fragrance cartridge 24. In alternative arrangements, the fragrance storage compartment 22 may receive a fragrant substance directly (e.g., by pouring a fragrant liquid directly into a reservoir formed within or by the fragrance storage compartment 22). In the illustrated arrangement, the fragrance storage compartment 22 is in the form of a tray. In alternative arrangements, the fragrance storage compartment 22 may be formed of any other suitable structure (e.g., a frame with supports for receiving one or more fragrance cartridges 24). In order to control which of the fragrance cartridges 24 are used to deliver fragrance via the exhaust 28, the fragrance delivery unit 12 may include a fragrance delivery mechanism 36 (shown schematically on Figure 6B). The fragrance delivery mechanism 36 may be configured to control the flow of air through the fragrance delivery unit 12 (driven by the blower 26) to selectively entrain a fragrant substance from one or more of the fragrance cartridges 24 in the flow of air. In other words, the fragrance delivery mechanism 36 may be configured to selectively provide a fluid communication between one or more of the fragrance cartridges 24 and the flow of air through the fragrance delivery unit 12 (driven by the blower 26). The fragrance delivery mechanism 36 may include one or more valves, moveable baffles or other air directing components. The fragrance delivery mechanism 36 may be controlled by a control signal 270 output from the controller 210 of the control system 200 described above (e.g., in response to one or more fragrance selection inputs 16c being operated by the user). In the illustrated arrangement, the fragrance storage compartment 22 is configured to receive three fragrance cartridges 24, but in alternative arrangements the fragrance storage compartment 22 may receive greater than three fragrance cartridges 24 or less than three fragrance cartridges 24 (e.g., a single fragrance cartridge 24). The fragrance storage compartment 22 is movable relative to the housing 20 between an open position (illustrated in Figure 6A), and a closed position (illustrated in Figure 6B). It will be understood that the open position of the fragrance storage compartment 22 is for loading and / or unloading of fragrance cartridges 24, and the closed position corresponds to the normal operating state of the fragrance delivery unit 12. In the illustrated arrangement, the fragrance storage compartment 22 is slidable relative to the housing 20 to transition between the open and closed positions. In other arrangements, the fragrance storage compartment 22 may be pivotable relative to the housing 20 to transition between the open and closed positions. The fragrance delivery unit 12 may include a compartment drive mechanism 38 (illustrated schematically on Figure 6A) for moving the fragrance storage compartment 22 between the open and closed positions. The compartment drive mechanism 38 may be controlled by a control signal 270 output from the controller 210 of the control system 200 described above (e.g., in response to the fragrance compartment control input 16b being operated by the user). In alternative arrangements, the fragrance storage compartment 22 may be spring-loaded and / or manually moved between the open and closed positions (e.g., by gripping and then pulling the fragrance storage compartment 22). In the illustrated arrangement, the fragrance delivery unit 12 has an electrical connector 50 for connecting one or more power and / or control lines to electrical components of the fragrance delivery unit 12. For example, the electrical connector 50 may be configured to connect the blower unit 26 and / or the fragrance delivery mechanism 36 and / or the compartment drive mechanism 38 to an electrical power source (e.g., a battery of the vehicle 1000). The electrical connector 50 may also be configured to receive one or more control signals 270 from the controller 210 for controlling the blower unit 26 and / or the fragrance delivery mechanism 36 and / or the compartment drive mechanism 38. The electrical connector 50 may be positioned on the upper surface 30, side surface 32, or lower surface 34 of the housing 20. In the illustrated arrangement, a single electrical connector 50 is provided for the fragrance delivery unit 12, but in some arrangements a separate electrical connector 50 may be provided for each electrical component of the fragrance delivery unit 12. The housing 20 of the fragrance delivery unit 12 may be formed of a plurality of housing portions 40, 42, 44 which are coupled together. For example, the housing 20 may include a side housing portion 40, an upper housing portion 42 which is coupled to an upper end of the side housing portion 40, and a lower housing portion 44 which is coupled to a lower end of the side housing portion 40. In some arrangements, the housing portions 40, 42, 44 are releasably coupled together (e.g., via a snap-fit arrangement, such as an arrangement include one or more clips 46). This may help to provide access to the inside of the housing 20 for maintenance or other purposes. The housing 20 may also include one or more mounting arrangements 48 (e.g., including one or more apertures for receiving a fastener) for mounting the fragrance delivery unit 12 at an appropriate position in the dashboard area 1004. Referring now to Figures 7 to 9B, a fragrance delivery duct for the vehicle 1000 of Figure 1 is indicated at 52. The fragrance delivery duct 52 has an inlet end 54 configured to receive a flow of fragrance-entrained air from a fragrance delivery unit (e.g., the fragrance delivery unit 12 of Figures 6A and 6B). The fragrance delivery duct 52 also has an outlet end 56 for supplying the flow of fragrance-entrained air to the vehicle cabin 1002. The fragrance delivery duct 52 also has a conduit 58 which extends from the inlet end 54 to the outlet end 56. As will be described in more detail below, the outlet end 56 is configured to guide the flow of fragrance-entrained air flowing along the conduit 58 into a vehicle cabin in separate first and second fragrance flow streams 60A, 60B which are spaced apart from each other in a transverse direction. In other words, the outlet end 56 defines first and second separate flow paths 62A, 62B which are spaced apart from each other in a transverse direction. The outlet end 56 may be configured to guide the flow of fragrance-entrained air flowing along the conduit 58 into a vehicle cabin in separate first and second fragrance flow streams 60A, 60B which are spaced apart from each other in a lateral direction. In this context, the term lateral direction will be understood to refer to a direction which is transverse to the general direction of the fragrance flow streams 60A, 60B. In other words, where the fragrance duct 52 is positioned so that the fragrance flow streams 60A, SOB are in a generally rearward direction into the vehicle cabin 1002, the lateral direction may be a sideways direction of the vehicle (e.g., in a direction from a left side to a right side of the vehicle cabin 1002), or where the fragrance duct 52 is positioned so that the fragrance flow streams 60A, 60B are in a generally sidewards direction into the vehicle cabin 1002 (e.g., in a direction from a left side to a right side of the vehicle cabin 1002 or vice versa), the lateral direction may be a longitudinal direction of the vehicle. The lateral direction may be a horizontal direction. The outlet end 56 may be configured to guide the flow of fragrance-entrained air flowing along the conduit 58 into a vehicle cabin in separate first and second fragrance flow streams 60A, 60B which are spaced apart from each other in a vertical direction (e.g., in a direction from an upper end to a lower end of the vehicle cabin 1002 or vice versa). In the illustrated embodiment, the outlet end 56 of the fragrance delivery duct 52 may be configured to directly supply the flow of fragrance-entrained air to the vehicle cabin 1002. In other words, the outlet end 56 of the fragrance delivery duct 52 may be configured such that the flow of fragrance-entrained air enters the vehicle cabin 1002 without first passing through any other ducts, conduits or similar passageways after leaving the outlet end 56 of the fragrance delivery duct 52. In the illustrated embodiment, the fragrance delivery duct 52 is configured to receive only the flow of fragrance-entrained air from the fragrance delivery unit 12. For example, the inlet end 54 of the fragrance delivery duct 52 may have only a single inlet 63 by which a flow of fragrance-entrained air can be received into the fragrance delivery duct 52. As best illustrated in Figure 8, the outlet end 56 of the fragrance delivery duct 52 may define separate and divergent first and second fragrance flow paths 62A, 62B. In other words, the first and second fragrance flow paths 62A, 62B may be non-parallel and a lateral distance between the first and second fragrance flow paths 62A, 62B may increase in the direction of the flow of fragrance-entrained air along the conduit 58. It will be understood that with this arrangement the flow of fragrance-entrained air flowing along the divergent first and second fragrance flow paths 62A, 62B will be guided into the vehicle cabin in separate first and second flow streams 60A, 60B which are also divergent, as well as spaced apart from each other in the lateral direction. In alternative embodiments, the first and second fragrance flow paths 62A, 62B are not divergent (e.g., parallel or convergent) but still spaced apart in the lateral direction. In the illustrated embodiment, the first and second fragrance flow paths 62A, 62B are defined by first and second outlets 64A, 64B respectively. In the illustrated embodiment, the first and second outlets 64A, 64B have respective central axes 66A, 66B which are arranged at an angle 0 relative to each other along a horizontal plane. In the illustrated embodiment, the angle 0 is approximately 90 degrees. In other embodiments, the angle 0 may be a different angle (e.g., in the range of 30 to 150 degrees, 45 to 135 degrees, and / or 60 to 120 degrees). In other embodiments, the first and second outlets 64A, 64B may be non-linear, for example the first and second outlets 64A, 64B may curve outwards in opposite (i.e., diverging) directions. In such embodiments, the angle 0 is defined between the directions of the central axes of the first and second outlets at their terminal ends. In the illustrated embodiment, the conduit 58 has a main conduit body 68 and the first and second outlets 64A, 64B branch off from the main conduit body 68. The conduit 58 may have one or more baffles provided inside the conduit 58 proximal to the outlet end 56, in order to direct flow along separate first and second flow paths 62A, 62B to the separate first and second flow streams 60A, 60B. This may provide an alternative means for dividing the conduit 58 at the outlet end 56. In the illustrated embodiment, the first and second fragrance flow paths 62A, 62B are spaced apart from each other in the lateral direction by a distance D. The spacing distance D may be at least 25%, e.g. at least 50%, e.g. at least 75%, e.g. at least 100%, e.g. at least 125%, e.g. at least 150%, e.g. at least 175%, e.g. at least 200%, e.g. at least 225%, e.g. at least 250% of a cross-sectional width of the conduit 58 upstream of the first and second fragrance flow paths 62A, 62B. For example, in the embodiment illustrated in Figure 8, the spacing distance D is approximately 135% of the cross-sectional width W of the conduit 58 upstream of the first and second fragrance flow paths 62A, 62B. The distance D may be at least 0.25 cm, e.g. at least 0.5 cm, e.g. at least 0.75 cm, e.g. at least 1 cm, e.g. at least 1.5 cm, e.g. at least 2 cm, e.g. at least 3 cm, e.g. at least 4 cm, e.g. at least 5 cm, e.g. at least 6 cm, e.g. at least 8 cm, e.g. at least 10 cm, e.g. at least 12 cm, e.g. at least 15 cm, e.g. at least 20 cm, e.g. at least 30 cm, e.g. at least 40 cm, e.g. at least 50 cm. It will be understood that since the illustrated fragrance flow paths 62A, 62B are divergent, this spacing distance D refers to the distance between the flow paths at the terminus of the outlet end 56 of the fragrance delivery duct 52, but that the spacing distance is narrower at upstream portions of the first and second fragrance flow paths 62A, 62B. In alternative embodiments, the spacing distance D may be constant along the length of the first and second fragrance flow paths 62A, 62B, or may be wider at upstream portions of the first and second fragrance flow paths 62A, 62B. As best illustrated in Figures 7, 9A and 9B, a cross-sectional width W of the conduit 58 may increase towards the outlet end 56 and a cross-sectional height H of the conduit 58 may decrease towards the outlet end 56. This may facilitate spreading flow outwards in different directions along the first and second fragrance flow paths 62A, 62B. In the illustrated embodiment, the conduit 58 has a transition region 70 over which the cross-sectional area of the conduit 58 simultaneously decreases in height and increases in width. In particular, the cross-sectional area of the fragrance delivery duct 52 is substantially constant along the length of the fragrance delivery duct 52 whilst the cross-sectional height and width vary along the length of the fragrance delivery duct 52. Such a transition region 70 facilitates a smooth transition which may help to maintain flow velocities along the conduit 58. Such a transition region 70 may also be useful for packaging purposes. The cross-sectional area of the transition region 70 may decrease towards the outlet end 56 to increase flow velocities along the conduit 58. This can increase the flow velocity and reach of the first and second flow streams into the vehicle cabin. In other embodiments, the cross-sectional width W and / or height H may be substantially constant along the length of the conduit 58. In the illustrated embodiment, the fragrance delivery duct 52 is formed as a single piece. In other words, the inlet end 54, outlet end 56 and conduit 58 are all integrally formed. This may simplify manufacturing as the fragrance delivery duct 52 can be installed in a fragrance delivery system (e.g., the fragrance delivery system 10 of Figure 2 or 10) simply by coupling the inlet end 54 to a fragrance delivery unit (e.g., the fragrance delivery unit 12 of Figures 6A, 6B and 10) without having to connect multiple parts. This arrangement may also reduce the risk of leakage of fragrance-entrained air along the length of the fragrance delivery duct 52. In some embodiments, the fragrance delivery duct 52 may be rigid. That is, capable of maintaining its shape if supported only at one end. This is in contrast to flexible ducts, such as corrugated tubing. The fragrance delivery duct 52 being rigid may ensure that the conduit 58 and outlet end 56 have the appropriate configuration for directing the flow of fragrance-entrained air through the fragrance delivery duct 52 as desired, regardless of how the fragrance delivery duct 52 is coupled to the vehicle 1000. In other words, the fragrance delivery duct 52 does not have to be manipulated into the correct position / shape by an assembly operator during assembly of the fragrance delivery system 10. For example, having a rigid outlet end 56 may ensure that the separate first and second flow streams 60A, 60B are directed into the vehicle cabin 1002 spaced apart from each other. Similarly, a rigid conduit 58 may ensure that the transition region 70 described above has the desired geometry. In alternative embodiments, the fragrance delivery duct 52 may be flexible. In the illustrated embodiment, the inlet end 54 has a snap-fit formation 72 for engaging a corresponding snap-fit formation on an outlet of a fragrance delivery unit. In particular, the snap-fit formation 72 is provided in the form of one or more recesses through the conduit proximal to the inlet end 54 for receiving one or more projections (e.g., projections 74 on a periphery of the fragrance delivery unit outlet 28 of the fragrance delivery unit 12 of Figures 6A, 6B and 10). An assembled snap-fit arrangement with the respective snap-fit formations 72, 74 engaged with each other is shown in Figure 10. In alternative embodiments, the snap-fit formation 72 of the inlet end 54 of the fragrance delivery duct 52 is in the form of one or more projections for being received in one or more recesses in the fragrance delivery unit outlet 28, or of any other suitable form. In alternative embodiments, the inlet end 54 is coupled to the fragrance delivery unit outlet 28 via any other suitable means (e.g., via corresponding threads on the inlet end 54 and the fragrance delivery unit outlet 28, via one or more clamps provided over the inlet end 54 and / or fragrance delivery unit outlet 28, via adhering / welding / bonding the inlet end 54 to the fragrance delivery unit outlet 28, via an interference fit, or via any other suitable fastening means). As best illustrated in Figure 7, the conduit 58 may have a bend 76 between the inlet end 54 and the outlet end 56. The bend 76 is configured to change the direction of air flowing along the conduit 58 by at least 90 degrees (e.g., around 180 degrees in the illustrated embodiment). In this way, the fragrance delivery duct 52 can be connected to the fragrance delivery unit outlet 28 on the upper surface 30 of the housing 20 of the fragrance delivery unit 12 of Figures 6A and 6B and then bend downwards so that the outlet end 56 is located below the inlet end 54 (e.g., as illustrated in Figure 10). This can enable the first and second flow streams to enter the vehicle cabin at a lower position to enable more even distribution of the fragrance-entrained air. It will be understood that in other embodiments (e.g., those with different packaging constraints), the conduit 58 may not have such a bend 76 (e.g., the conduit 58 may be substantially linear along its length). As best illustrated in Figure 8, the fragrance delivery duct 52 may have a mounting arrangement 78 to facilitate securing the fragrance delivery duct 52 in an appropriate position within the vehicle 1000. In the illustrated embodiment, the mounting arrangement 78 is in the form of a mounting projection 80 which extends from a side of the conduit 58. The mounting projection 80 has one or more apertures 82 for receiving fasteners to secure the mounting projection 80 to a part of a vehicle. In other embodiments, the mounting arrangement 78 may have any other suitable structure. In the illustrated embodiment, the mounting arrangement 78 is integrally formed with the fragrance delivery duct 52. Still referring to Figure 8, the fragrance delivery duct 52 may have a recess 84 between the first and second outlets 64A, 64B. This may help to locate and / or retain the fragrance delivery duct 52 at a suitable position within a vehicle during assembly (e.g., by receiving a corresponding locating formation in the recess 84 before securing the fragrance delivery duct 52 via the mounting arrangement 78). In the illustrated embodiment, the recess 84 is defined by first and second transverse walls 86A, 86B which extend from the first and second outlets 64A, 64B in the lateral direction. In the illustrated embodiment, the transverse walls 86A, 86B are shaped so that the recess 84 is in the form of a linear slot, rather than the flared V-shape defined between the first and second outlets 64A, 64B. This facilitates more accurate alignment of the fragrance delivery duct 52 in the lateral direction. In the illustrated embodiment, the transverse walls 86A, 86B are shaped so that the recess 84 flares outwards towards the outlet end 56, which may facilitate easier insertion of a locating formation into the recess 84. Referring now to Figure 10, a fragrance delivery system for the vehicle 1000 of Figure 1 is indicated at 10. The fragrance delivery system 10 includes the fragrance delivery unit 12 of Figures 6A and 6B, and the fragrance delivery duct of Figures 7 to 9B. The inlet end 54 of the fragrance delivery duct 52 is coupled to the fragrance delivery unit outlet 28 of the fragrance delivery unit 12 (e.g., using the snap-fit formations 72, 74 described above). In this way, the inlet end 54 of the fragrance delivery duct 52 can receive a flow of fragrance-entrained air supplied by the fragrance delivery unit 12 to be conveyed along the conduit 58. As mentioned above, the fragrance delivery unit 12 has a blower unit 26 configured to entrain the fragrant substance in a flow of air drawn through the unit and to deliver the resulting flow of fragrance-entrained air to the fragrance delivery unit outlet 28. It will be understood that the fragrance delivery unit 12 is optionally configured to supply the flow of fragrance-entrained air without heating, cooling or air conditioning the flow of air. In other words, the fragrance delivery unit 12 does not perform any HVAC functions. The fragrance delivery unit 12 may be configured to supply the flow of frag rance-entrained air through the fragrance delivery unit outlet 28 at a volumetric flow rate in the range of 0.1 to 1.5 l / s (e.g., in the range of 0.25 to 1 l / s). In other words, the blower unit 26 may be configured to drive a flow of air through the fragrance delivery unit 12 and out of the fragrance delivery unit outlet 28 at such a flow rate. As will be described later with reference to Figures 13 and 14, such a flow rate may facilitate an even distribution of fragrance around a vehicle cabin. Referring now to Figure 11, an instrument panel (or “dashboard area”) for the vehicle 1000 of Figure 1 is indicated at 1004. The instrument panel 1004 has a steering wheel mounting location 1005 and the fragrance delivery system 10 of Figure 10. Although the fragrance delivery unit 12 is not visible in this view, the position of the fragrance delivery duct 52 is highlighted. In this embodiment, the outlet end 56 of the fragrance delivery duct 52 is located on an opposite side of the instrument panel 1004 to the steering wheel mounting location 1005. In particular, the instrument panel 1004 has a glovebox assembly 1010 (e.g., of the kind illustrated in more detail in Figure 5) which includes the fragrance delivery system 10, and the glovebox assembly 1010 is positioned on an opposite side of the instrument panel 1004 to the steering wheel mounting location 1005. As will be understood, the term “steering wheel mounting location” refers to the general vicinity of the intended steering wheel position, rather than to a specific mounting point for the steering wheel - which will typically be connected at the end of a steering column extending through the opening in the instrument panel as indicated at reference number 1005 in Figure 11. It will be understood that the outlet end 56 of the fragrance delivery duct 52 being located on an opposite side of the instrument panel 1004 to the steering wheel mounting location 1005 may provide a simpler packaging arrangement than if the outlet end 56 of the fragrance delivery duct 52 was proximal to the steering wheel mounting location 1005. Further, as will be explained in more detail below with reference to Figures 13 and 14, an even distribution of fragrance may still be achieved in this position of the outlet end 56 because it is configured to guide fragrance-entrained air flowing along the conduit 58 into the vehicle cabin in separate first and second fragrance flow streams 60A, 60B which are spaced apart from each other in the lateral direction. In the illustrated embodiment, the instrument panel 1004 also includes a centre console mounting location 1009 in a central position ofthe instrument panel 1004 (e.g., for receiving the touchscreen 18 described above with reference to Figures 2 and 3). Referring now to Figure 12, the glovebox assembly 1010 ofthe instrument panel 1004 is shown in crosssection along plane C-C of Figure 11. As mentioned above with reference to Figure 5, the glovebox assembly 1010 has a glovebox body 1012 which defines a glovebox interior 1014 for storing objects. The glovebox assembly 1010 also has the fragrance delivery system 10 of Figure 10 (although only the fragrance delivery duct 52 is shown in this cross-sectional view). In this embodiment, the fragrance delivery unit 12 and fragrance delivery duct 52 are mounted to the glovebox body 1012 (e.g., via the mounting arrangements 48, 78 described above). In particular, the fragrance delivery duct 52 is mounted so that the outlet end 56 is positioned underneath the glovebox interior 1014, so that the flow of fragrance-entrained air is output from the glovebox assembly 1010 underneath the glovebox interior 1014 and glovebox closure 1016 (i.e., in the general direction indicated by arrow 60). It will be understood that the glovebox assembly 1010 may be manufactured as a separate module for installing in the instrument panel 1004. Therefore, providing the fragrance delivery system 10 as part of the glovebox assembly 1010 facilitates a modular design. For example, a modular production line may be used which allows the glovebox assembly 1010 to be installed in some vehicles (e.g., in vehicles where the fragrance delivery system 10 has been selected as an upgrade option), and for an alternative glovebox assembly to be installed in other vehicles (e.g., in vehicles without the fragrance delivery system upgrade), without having to change the design of the rest of the instrument panel 1004. In the illustrated embodiment, the glovebox assembly 1010 is an upper glovebox assembly, and the instrument panel 1004 also includes a lower glovebox assembly 1011 positioned below the upper glovebox assembly 1010. In the illustrated embodiment, the outlet end 56 of the fragrance delivery duct 52 is positioned so that fragrance-entrained air is output between the upper and lower glovebox assemblies 1010, 1011. The upper and lower glovebox assemblies 1010, 1011 may be manufactured as a single module for installing in the instrument panel 1004 as a single unit, or as separate modules for installing in the instrument panel 1004 separately. In alternative embodiments, there may be a single glovebox assembly (e.g., the lower glovebox assembly 1011 may be omitted, or the upper glovebox assembly 1010 may be omitted and the fragrance delivery system 10 may be part of the lower glovebox assembly 1011). Referring again to Figure 11, an air flow system is indicated at 1022. The air flow system 1022 includes the fragrance delivery system 10 described above. The air flow system 1022 also includes a HVAC system 1024, which is shown schematically in this view. The HVAC system 1024 has a HVAC unit 1026 configured to supply a flow of HVAC air to a plurality of HVAC outlets 1028 each being positioned to provide a respective HVAC flow stream 1030 in a vehicle cabin. In the illustrated embodiment, three HVAC outlets 1028 are shown for illustrative purposes, but it will be understood that there may be more than three HVAC outlets 1028 and corresponding HVAC flow streams 1030. As illustrated by the dashed arrows on Figure 11, the outlet end 56 of the fragrance delivery duct 52 may be positioned to direct the first and second fragrance flow streams 60A, 60B towards at least two different HVAC flow streams 1030 to each other. This may facilitate an even distribution of fragrance around the vehicle cabin 1002, because the streams 60A, 60B of fragrance-entrained air may be propelled around the vehicle cabin 1002 by the streams of HVAC air 1030. In the illustrated embodiment, the HVAC outlets 1028 are positioned to provide at least one first HVAC flow stream 1030 on a first lateral side of the vehicle cabin 1002 and at least one second HVAC flow stream 1030 on a second lateral side of the vehicle cabin 1002, and the outlet end 56 of the fragrance delivery duct 52 is positioned to direct the first fragrance flow stream 60A towards the at least one first HVAC stream 1030 and to direct the second fragrance flow stream 60B towards the at least one second HVAC stream 1030. It will be understood that the HVAC system 1024 is a separate air flow system to the fragrance delivery system 10. In other words, the HVAC unit 1026 may supply a flow of HVAC air along one or more HVAC ducts 1032 (shown schematically on Figure 11) to the HVAC outlets 1028, and the fragrance delivery duct 52 is separate to the HVAC ducts 1032. Put another way, a flow of HVAC air which is supplied by the HVAC unit 1026 does not flow along the fragrance delivery duct 52. Similarly, the flow of fragrance-entrained air supplied by the fragrance delivery unit 12 does not flow along the HVAC ducts 1032. It will be understood that the components illustrated schematically in the vehicle of Figure 1 may be replaced by the components shown in more detail in subsequent figures. For example, the vehicle 1000 may include the fragrance delivery duct 52 of Figures 7 to 9A, the fragrance delivery system 10 of Figure 10, the instrument panel 1004 of Figure 11, the glovebox assembly 1010 of Figures 5 and 12, and the air flow system 1022 of Figure 11. Such a vehicle is illustrated in Figures 13 and 14. Referring to Figures 13 and 14, the results of computational fluid dynamics simulations showing the distribution of fragrance-entrained air around the vehicle cabin 1002 is illustrated by various fragrance flow lines 1034. In the operating mode illustrated in Figure 13, the volumetric flow rate of fragrance-entrained air supplied by the fragrance delivery unit 12 is 1 l / s, and the HVAC system 1024 is set to supply HVAC air out of HVAC outlets directed towards the faces of the vehicle occupants. The flow rate of HVAC air is a quarter of the maximum flow rate of HVAC air that can be supplied by the HVAC system 1024. This corresponds to typical extended use-cases of a vehicle HVAC system (e.g., when driving in hot weather after initial cooling of the vehicle cabin 1002 at start-up, or when driving in cold weather after initial heating of the vehicle cabin 1002 at start-up). In the operating mode illustrated in Figure 14, the volumetric flow rate of fragrance-entrained air supplied by the fragrance delivery unit 12 is 1 l / s, and the HVAC system 1024 is set to supply HVAC air out of HVAC outlets directed towards the feet of vehicle occupants. The flow rate of HVAC air is the maximum flow rate of HVAC air that can be supplied by the HVAC system 1024. This corresponds to a less typical use-case of a vehicle HVAC system (e.g., when wanting to warm and / or dry the feet of front seat occupants). As can be seen from the fragrance flow lines 1034 of Figures 13 and 14, there is an approximately even distribution of fragrance around the vehicle cabin 1002 in both setting modes, despite the fact that the fragrance delivery duct 52 is positioned close to the right-hand side of the instrument panel 1004 (i.e. in a “worst-case” positioning for providing an even distribution of fragrance). Such an effect may be facilitated by the configuration of the outlet end 56 of the fragrance delivery duct 52 described above. It will be appreciated that various changes and modifications can be made to the present invention without departing from the scope of the present application. It should also be noted that whilst the appended claims set out particular combinations of features described above, the scope of the present disclosure is not limited to the particular combinations hereafter claimed, but instead extends to encompass any combination of features herein disclosed.

Claims

1. A fragrance delivery duct for a vehicle, the fragrance delivery duct comprising:an inlet end configured to receive a flow of fragrance-entrained air from a fragrance delivery unit;an outlet end for supplying the flow of fragrance-entrained air to a vehicle cabin; anda conduit which extends from the inlet end to the outlet end;wherein the outlet end is configured to guide the flow of fragrance-entrained air flowing along the conduit into a vehicle cabin in separate first and second fragrance flow streams which are spaced apart from each other in a lateral direction.

2. The fragrance delivery duct of claim 1, wherein the fragrance delivery duct is configured to receive only the flow of fragrance-entrained air from the fragrance delivery unit.

3. The fragrance delivery duct of claim 1 or claim 2, wherein the outlet end defines separate and divergent first and second fragrance flow paths.

4. The fragrance delivery duct of claim 3, wherein the first and second fragrance flow paths are defined by first and second outlets respectively.

5. The fragrance delivery duct of claim 4, wherein the first and second outlets comprise respective central axes which are arranged at an angle relative to each other along a horizontal plane; optionally, wherein the angle is in the range of 30 to 150 degrees, optionally in the range of 45 to 135 degrees, optionally in the range of 60 to 120 degrees.

6. The fragrance delivery duct of claim 4 or 5, wherein the conduit comprises a main conduit body and the first and second outlets branch off from the main conduit body.

7. The fragrance delivery duct of any preceding claim, wherein a cross-sectional width of the conduit increases towards the outlet end and / or wherein a cross-sectional height of the conduit decreases towards the outlet end.

8. The fragrance delivery duct of any preceding claim, wherein the first and second fragrance flow streams are spaced apart from each other in the lateral direction by a distance of at least 0.5 cm, optionally at least 1 cm, optionally at least 2 cm, optionally at least 4 cm, optionally at least 8 cm, optionally at least 15 cm, optionally at least 30 cm, optionally at least 50 cm.

9. The fragrance delivery duct of any preceding claim, wherein the fragrance delivery duct is formed as a single piece.

10. A fragrance delivery system comprising:a fragrance delivery unit configured to supply a flow of fragrance-entrained air; andthe fragrance delivery duct of any preceding claim, wherein the inlet end of the fragrance delivery duct is coupled to a fragrance delivery unit outlet of the fragrance delivery unit for receiving the flow of fragrance-entrained air from the fragrance delivery unit.

11. The fragrance delivery system of claim 10, wherein the fragrance delivery unit is configured to supply a flow of fragrance-entrained air through the fragrance delivery unit outlet at a volumetric flow rate in the range of 0.1 to 1.5 l / s, optionally in the range of 0.25 to 1 l / s.

12. A glovebox assembly comprising:a glovebox body which defines a glovebox interior for storing objects; andthe fragrance delivery system of claim 10 or 11, wherein the fragrance delivery unit and / or fragrance delivery duct is mounted to the glovebox body.

13. An instrument panel comprising a steering wheel mounting location and the fragrance delivery system of claim 10 or 11, wherein the outlet end of the fragrance delivery duct is located on an opposite side of the instrument panel to the steering wheel mounting location, optionally, wherein the instrument panel comprises the glovebox assembly of claim 12 positioned on an opposite side of the instrument panel to the steering wheel mounting location.

14. An air flow system comprising:the fragrance delivery system of claim 10 or 11; anda HVAC system comprising a HVAC unit configured to supply a flow of HVAC air to a plurality of HVAC outlets each being positioned to provide a respective HVAC flow stream in a vehicle cabin;wherein the outlet end of the fragrance delivery duct is positioned to direct the first and second fragrance flow streams towards at least two different HVAC flow streams to each other.

15. A vehicle comprising the fragrance delivery duct of any of claims 1 to 9 and / or the fragrance delivery system of claims 10 or 11 and / or the glovebox assembly of claim 12 and / or the instrument panel of claim 13 and / or the air flow system of claim 14.

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