Fragrance delivery system calibration factors

Abstract

A control system 200 controls a fragrance delivery system of a vehicle. The control system comprises one or more processors 220 collectively configured to receive an input signal 260 indicative of one or more characteristics associated with an interior of the vehicle such as an environmental characteristic (e.g. temperature, humidity) and / or a status of a closure (e.g. a door, window or boot) of the vehicle. The one or more processors determine a mode of operation of the fragrance delivery system (e.g. pulsed mode, continuous mode or elevated mode) in dependence on at least one of the characteristics and output a control signal 270 to the fragrance delivery system to cause the fragrance delivery system to operate in the determined mode to circulate fragrance into a cabin of the vehicle. A fragrance delivery system controlled by the control system, a vehicle including the fragrance delivery system and a method of controlling a fragrance delivery system are also claimed. The control system mitigates against olfactory fatigue (nose blindness) of occupants of the vehicle.

Description

The present disclosure relates to a fragrance delivery system. Aspects of the invention relate to a control system, a system, a vehicle and to a method. BACKGROUND It is known to use air fresheners which passively release a fragrance to provide a pleasant smell inside a vehicle 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 control system, a system, a vehicle, a method, and computer readable instructions, as claimed in the appended claims. This disclosure provides a technique for mitigating olfactory fatigue of a fragrance within a vehicle by occupants of the vehicle. The technique operates a fragrance delivery system of the vehicle based on factors relevant to an interior of the vehicle. According to an aspect of the present invention there is provided a control system for controlling a fragrance delivery system of a vehicle. The control system comprises one or more controllers collectively configured to receive an input signal indicative of one or more characteristics associated with an interior of the vehicle; and determine a mode of operation of the fragrance delivery system in dependence on at least one of the one or more characteristics associated with the interior of the vehicle. The one or more controllers may be collectively configured to output a control signal to the fragrance delivery system, the control signal being configured to cause the fragrance delivery system to operate in the determined mode to circulate fragrance into a cabin of the vehicle. In this way, the fragrance delivery system can be controlled to circulate fragrance into the cabin of the vehicle in an adaptive manner based on characteristics of the internal environment of the cabin such that a vehicle occupant’s perception of the fragrance is maintained or heightened, and olfactory fatigue is mitigated. The one or more controllers may comprise at least one electronic processor having an electrical input for receiving the input signal indicative of one or more characteristics associated with an interior of the vehicle. The control system may further comprise at least one memory device electrically coupled to the at least one electronic processor and have instructions stored therein; wherein the at least one electronic processor is configured to access the at least one memory device and execute the instructions thereon. Optionally, the one or more characteristics associated with an interior of the vehicle comprise an environmental characteristic and / or a status of a closure of the vehicle. A person’s perception of a fragrance can be influenced by environmental characteristics associated with an interior of the vehicle (e.g., temperature, humidity, etc). By considering environmental characteristics, the fragrance delivery system can be operated such that the vehicle occupant’s perception of the fragrance is maintained or heightened, and olfactory fatigue is mitigated. Additionally, the fragrance delivery system can also be operated based on a status of a closure of the vehicle, e.g., if a vehicle door has been opened, the fragrance delivery system can be deactivated in order to reduce wastage of the fragrance and to save energy. Upon the vehicle door being closed, the fragrance system can be reactivated. Optionally, the one or more characteristics associated with an interior of the vehicle comprise one or more of a temperature within or outside of a cabin of the vehicle; a humidity within or outside of the cabin of the vehicle; an altitude of the vehicle; a dimension of the cabin of the vehicle; a fragrance level within the cabin of the vehicle; and a status of at least one of a window, door or boot of the vehicle, the status indicating whether the at least one window, door or boot is open or closed. A person’s perception of a fragrance can be influenced by factors such as temperature, humidity and altitude. For example, fragrances may be less perceptible at higher relative humidity levels due to saturation of the air with water vapour. Fragrances may also be less perceptible at lower relative temperatures due to decreased volatility of odour molecules. Additionally, the physical dimensions of a vehicle cabin may affect an occupant’s ability to perceive a given fragrance (for example, if the vehicle cabin is disproportionately large compared to the amount of fragrance being circulated within it). Similarly, if a fragrance level (e.g., a concentration level of the fragrance) in the vehicle cabin falls below a certain threshold, the occupant may no longer be able to perceive the fragrance. Additionally, should a window, door, or boot of the vehicle be opened, the vehicle occupant’s perception of the fragrance will likely decrease owing to the influx of ambient air into the vehicle. By considering the above environmental characteristics, the fragrance delivery system can be operated such that the vehicle occupant’s perception of the fragrance is maintained or heightened, and olfactory fatigue is mitigated. Moreover, in the scenario where a window, door or boot of the vehicle is opened, the fragrance delivery system may be deactivated in order to prevent fragrance being circulated out of the vehicle and into the outside environment, to reduce wastage of the fragrance and to save energy. Optionally, the one or more processors are collectively configured to determine at least one of a pulsed mode of operation and a continuous mode of operation. The continuous mode of operation may be suitable during general day-to-day running of the vehicle and be configured to maximise the lifetime of fragrance stored in the fragrance delivery system. The pulsed mode of operation may be used to ensure that an occupants perception of the fragrance can be maintained or heightened, thereby reducing the risk of olfactory fatigue. Optionally, the one or more processors are collectively configured to determine the pulsed mode of operation of the fragrance delivery system in dependence on at least one of the one or more characteristics associated with the interior of the vehicle reaching a first characteristic threshold. By operating the fragrance delivery system in a pulsed mode, the occupant’s perception of the fragrance can be maintained or heightened, thereby reducing the risk of olfactory fatigue. For example, if the temperature within the vehicle cabin drops to a certain value (e.g., if the air conditioning is activated), then the fragrance delivery system can be operated in the pulsed mode of operation to maintain or heighten the occupant’s perception of the fragrance at the relatively lower cabin temperature. Optionally, the one or more characteristics associated with the interior of the vehicle comprise a fragrance level within the cabin of the vehicle, and the one or more processors are collectively configured to output a control signal to operate the fragrance delivery system in the pulsed mode of operation when the fragrance level within the cabin of the vehicle reaches a threshold fragrance level. The perceptible level of fragrance in the vehicle cabin may decrease with time, as a result of the fragrance delivery system having been temporarily deactivated, and / or a vehicle window having been opened. By receiving a fragrance level (e.g., a concentration level of the fragrance) within the cabin (e.g., from a sensor mounted within the cabin), the fragrance delivery system can be operated in the pulsed mode in order to restore the occupant’s perception of the fragrance when the fragrance level reaches a particular threshold level (e.g., a minimum perceptible level). Optionally, the one or more processors are collectively configured to determine one or more parameters of the pulsed mode of operation in dependence on at least one of the one or more characteristics associated with the interior of the vehicle. In this way, the fragrance delivery system can be operated appropriately to ensure continued perception of the fragrance by vehicle occupants despite changes in the characteristics associated with the interior of the vehicle. Optionally, the one or more parameters of the pulsed mode of operation comprise operation of the fragrance delivery system in a continuous mode of operation for a first time period, deactivation of the fragrance delivery system for a second time period following the first time period, and operation of the fragrance delivery system in the continuous mode of operation for a third time period following the second time period. Additionally, or alternatively, the one or more parameters of the pulsed mode of operation comprise operation of the fragrance delivery system at a first intensity for a first time period, and operation of the fragrance delivery system at a second intensity for a second time period, wherein the first intensity is different to the second intensity. In this way, olfactory fatigue of occupants of the vehicle is reduced. Optionally, the one or more processors are collectively configured to select a mode of operation from a plurality of pulsed modes of operation in dependence on at least one of the one or more characteristics associated with the interior of the vehicle. The one or more processors may be collectively configured to output a control signal to cause the fragrance delivery system to operate in the selected pulsed mode of operation. In this way, the fragrance delivery system may be operated using a number of pre-defined pulsed modes, which may be selected from based on conditions of the cabin. For example, there may be three different pulsed modes with varying levels of intensity and duration, with each pulsed mode being used for a certain range of temperatures within the vehicle cabin. In this respect, a pulsed mode that circulates fragrance at a relatively low intensity and / or for short durations may be used for higher temperatures, when fragrances are more perceptible to the inhabitants of the vehicle, whilst a pulsed mode that circulates fragrance at a relatively high intensity and / or for longer durations may be used for lower temperatures, when fragrances are less perceptible to the inhabitants of the vehicle. Optionally, the fragrance delivery system comprises a plurality of fragrances. The one or more processors may be collectively configured to determine the mode of operation based on which of the plurality of fragrances is selected. Some fragrances may be comparatively weaker in scent than others and therefore require a higher degree of circulation into the vehicle cabin compared to fragrances having a comparatively stronger scent, which will be more perceptible to a vehicle occupant and may therefore require a lower degree of circulation into the vehicle cabin. Optionally, the fragrance delivery system comprises a plurality of fragrances. The one or more processors may be collectively configured to output a control signal to the fragrance delivery system to switch from circulation of a first fragrance into the cabin of the vehicle to circulation of a second fragrance into the cabin of the vehicle in dependence upon at least one of: at least one of the characteristics associated with the interior of the vehicle reaching a first threshold; and a predetermined time period. In this way, the fragrance delivery system can be operated to cycle between different fragrances, thereby mitigating the chance of a vehicle occupant becoming accustomed to a particular fragrance such that it is no longer as noticeable to them (i.e., olfactory fatigue). Optionally, the fragrance delivery system comprises a blower unit. The one or more processors may be collectively configured output a control signal configured to cause the blower unit to operate in the determined mode to circulate fragrance into the cabin of the vehicle. As such, the blower unit may be used to increase circulation of the fragrance within the vehicle cabin. Optionally, the blower unit comprises a fan. Optionally, the one or more processors are collectively configured to cause the blower unit of the fragrance delivery system to operate at an elevated mode of operation for a predetermined time period in response to: user input provided to a human machine interface (HMI) of the vehicle; or a fragrance level within the cabin of the vehicle reaching a threshold fragrance level. For example, in cases where the blower unit comprises a fan, the one or more processors may be collectively configured to cause the fan to operate at an elevated speed for a predetermined time period. In this way, the level of fragrance in the vehicle cabin can be temporarily boosted either by an occupant (e.g., if the occupant becomes aware they can no longer sense the fragrance, or becomes aware of a bad odour in the vehicle cabin), or when the fragrance level in the cabin drops to a threshold level in order to restore the occupant’s perception of the fragrance. Optionally, the one or more parameters of the pulsed mode of operation comprise operation of the fan of the fragrance delivery system at a continuous speed for a first time period, deactivation of the fan of the fragrance delivery system for a second time period following the first time period, and operation of the fan of the fragrance delivery system at the continuous speed for a third time period following the second time period. Additionally, or alternatively, the one or more parameters of the pulsed mode of operation comprise operation of the fan of the fragrance delivery system at a first speed for a first time period, and operation of the fan of the fragrance delivery system at a second speed for a second time period, wherein the first speed is different to the second speed. In this way, olfactory fatigue of occupants of the vehicle is reduced. According to another aspect of the invention, there is provided a system comprising the control system as mentioned above and a fragrance delivery system mounted within a vehicle. According to yet another aspect of the invention, there is provided a vehicle comprising the system as mentioned above or the control system as mentioned above. According to a further aspect of the invention, there is provided a method for controlling a fragrance delivery system of a vehicle. The method comprises receiving an input signal indicative of one or more characteristics associated with the interior of the vehicle. The method further comprises determining a mode of operation of the fragrance delivery system in dependence on at least one of the one or more characteristics associated with the interior of the vehicle. The method further comprises outputting a control signal to the fragrance delivery system, the control signal being configured to cause the fragrance delivery system to operate in the determined mode to circulate fragrance into a cabin of the vehicle. According to a still further aspect of the invention, there are provided computer readable instructions which, when executed by one or more processors, cause the one or more processors to perform the method as mentioned 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 flow chart showing operations performed by the control system of Figure 4 according to an embodiment of the invention. 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 or dashboard 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. Referring to Figure 1, the vehicle 1000 may include one or more internal sensors 15 mounted within the vehicle cabin 1002. The one or more sensors 15 may be configured to collect data related to one or more 6 characteristics associated with an interior of the vehicle, such as, for example, a temperature and / or humidity within the vehicle cabin 1002. Additionally, or alternatively, the vehicle 1000 may also include one or more external sensors 17 mounted external to the vehicle cabin 1002. The one or more external sensors 17 may be configured to collect data related to one or more characteristics associated with an exterior of the vehicle, such as, for example, a temperature and / or humidity of the ambient environment surrounding the vehicle 1000. 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). 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. Additionally, or alternatively, the input means 240 may be arranged to receive one or more input signals 260 indicative of one or more characteristics associated with an interior of the vehicle 1000 based on data gathered by the one or more internal sensors 15 mounted within the vehicle cabin 1002. Additionally, or alternatively, the input means may be arranged to receive one or more input signals 260 indicative of one or more characteristics associated with an exterior of the vehicle 1000 based on data gathered by the one or more external sensors 17 mounted external to the vehicle cabin 1002, from which characteristics associated with the interior of the vehicle 1000 may be derived. 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. The output means 250 may output a control signal 270 the fragrance delivery unit 12 in response to data gathered by the one or more internal sensors 15 or the one or more external sensors 17 indicative of one or more characteristics associated with an interior and / or exterior of the vehicle 1000 respectively. For example, the output means 250 may output the control signal 270 to the blower unit 26 of the fragrance delivery unit 12. 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. Figure 7 is a flowchart 700 according to an embodiment of the invention. The flowchart 700 illustrates steps performed by the control system 200 in controlling the fragrance delivery system 10 of a vehicle, such as the vehicle 1000 illustrated in Figure 1. In particular, the memory means 230 may comprise computer-readable instructions which, when executed by the processing means 220, perform the steps of flowchart 700 according to an embodiment of the invention. At step 710, the processing means 220 of the controller 210 is configured to receive an input signal 260 indicative of one or more characteristics associated with an interior of the vehicle 1000 via the input means 240. As discussed above with respect to Figure 4, the input signal 260 may comprise one or more characteristics associated with the interior of the vehicle 1000 (i.e., within the vehicle cabin 1002) sensed by one or more internal sensors 15 mounted within the vehicle cabin 1002. Similarly, the input signal 260 may comprise one or more characteristics associated with an exterior of the vehicle 1000 sensed by one or more external sensors 17 mounted on the vehicle 1000, from which one or more characteristics associated with the interior of the vehicle 1000 may be derived. The one or more characteristics associated with the interior of the vehicle 1000 may comprise an environmental characteristic. For example, the environmental characteristic may be one or more of a temperature within the vehicle cabin 1002, a humidity within the vehicle cabin 1002, and an altitude of the vehicle 1000. The temperature and humidity within the vehicle cabin 1002 can be measured by the one or more internal sensors 15. Alternatively, the temperature and humidity within the vehicle can be inferred from measurements taken by the one or more external sensors 17. It would be appreciated that a characteristic associated with the interior of the vehicle may be intrinsically linked to conditions that are external to the vehicle, e.g. ambient air pressure being dependent on altitude. The one or more characteristics may comprise one or more dimensions of the vehicle cabin 1002, for example a length, height and / or width of the vehicle cabin 1002, from which an internal volume of the vehicle cabin 1002 may be determined. The one or more characteristics may comprise a fragrance level (e.g,, a concentration level of the fragrance) within the vehicle cabin 1002 measured by one of the one or more internal sensors 15 (for example, as measured by an odour sensor or an electronic nose). The one or more characteristics associated with the interior of the vehicle 1000 may also comprise a status of a closure of the vehicle 1000, for example, whether a window, door, or boot of the vehicle is open or closed. At step 720 the processing means 220 of the controller 210 is configured to determine a mode of operation of the fragrance delivery system 10 in dependence on at least one of the one or more characteristics associated with the interior of the vehicle 1000 received at step 710. In this respect, the processing means 220 receives the input signal 260 from the input means 240, and upon executing the instructions stored in the memory means 230, determines the mode of operation. The mode of operation of the fragrance delivery system may be a continuous mode of operation, a pulsed mode of operation, or a combination thereof, or a deactivated mode of operation. In the continuous mode of operation, fragrance is emitted from the fragrance delivery system 10 along the flow path 14 into the vehicle cabin 1002 in a continuous manner. In other words, a continuous supply of fragrance is emitted into the vehicle cabin 1002. In the pulsed mode of operation, fragrance is emitted from the fragrance delivery system 10 along the flow path 14 into the vehicle cabin 1002 in a non-continuous manner. For example, in the pulsed mode of operation, delivery of fragrance into the vehicle cabin 1002 may occur as a series of pulses interspersed with periods of time where no fragrance is delivered into the vehicle cabin. For example, the fragrance delivery system 10 may be operated in a continuous manner for a first time period before being deactivated for a second time period following the first time period and then operated again in the continuous manner for a third time period following the second time period. Additionally, or alternatively, the pulsed mode may involve temporarily increasing a concentration of fragrance delivered into the vehicle cabin 1002 by emitting fragrance from the fragrance delivery system 10 for a predetermined time period, for example, for a period of 30 to 60 seconds. The pulsed mode of operation may also temporarily increase a concentration of fragrance delivered into the vehicle cabin 1002 through operation of a blower unit 26 of the fragrance delivery system 10 at a first intensity for a first time period and operation of the blower unit 26 at a second intensity greater than the first intensity for a second time period before returning to the first intensity. The processing means 220 of the controller 210 may determine to operate the fragrance delivery system 10 in the continuous mode based on the one or more characteristics associated with the interior of the vehicle 1000. As one example, the control system 200 may be configured to determine the continuous mode of operation when a temperature within the vehicle cabin 1002 (measured by the one or more internal sensors 15 or inferred from temperature measurements taken by the one or more external sensors 17) remains relatively constant (e.g., within a given temperature range). As another example, the processing means 220 may be configured to determine the continuous mode of operation based on the closure status of the vehicle 1000. For example, the processing means 220 may be configured to determine the continuous mode of operation when the windows, doors and boot of the vehicle are closed. The processing means 220 of the controller 210 may determine to operate the fragrance delivery system 10 in the pulsed mode of operation based on the one or more characteristics associated with the interior of the vehicle 1000. For example, the processing means 220 may be configured to determine the pulsed mode of operation in dependence on at least one of the one or more characteristics reaching a predetermined threshold. As one example, if a humidity level inside the vehicle cabin 1002 (measured by the one or more internal sensors 15) increases to a vehicle cabin humidity threshold, the processing means 220 may be configured to determine a pulsed mode of operation. In general, a relatively higher humidity level within the vehicle cabin will lead to reduced dispersal of the fragrance around the vehicle cabin 1002, leading to reduced perception of the fragrance by occupants of the vehicle 1000. It will therefore be appreciated that the vehicle cabin humidity threshold maybe any suitable threshold calibrated for the vehicle 1000 and the vehicle cabin 1002. As such, processing means 220 may determine to operate in the pulsed mode in order to restore and / or boost the occupant’s perception of the fragrance by controlling the fragrance delivery system 10 to delivery fragrance into the vehicle cabin 1002 as a series of pulses and / or by temporarily increasing a concentration of fragrance into the vehicle cabin 1002 by emitting fragrance from the fragrance delivery system 10 for a predetermined time period. As another example, a relative temperature in the vehicle cabin 1002 (as measured by the one or more internal sensors 15 or inferred from temperature measurements taken by the one or more external sensors 17) can influence dispersal of the fragrance around the vehicle cabin, and by extension, the perception of the fragrance by occupants of the vehicle 1000. At relatively lower vehicle cabin 1002 temperatures, the fragrance may disperse comparatively less, leading to reduced perception of the fragrance by occupants. As such, the processing means 120 may determine to operate in the pulsed mode if a temperature inside the vehicle cabin 1002 reaches a vehicle cabin temperature threshold, in order to restore and / or boost the occupant’s perception of the fragrance, by controlling the fragrance delivery system 10 to delivery fragrance into the vehicle cabin 1002 as a series of pulses and / or by temporarily increasing a concentration of fragrance into the vehicle cabin 1002. A frequency of the series of pulses can be varied depending on the temperature within the vehicle cabin 1002. For example, the frequency of the series of pulses may be increased at lower cabin temperatures and decreased as the temperature within the vehicle cabin 1002 increases. Similarly, the concentration of fragrance delivered into the vehicle cabin 1002 may vary depending upon the temperature in the vehicle cabin, with the concentration of fragrance delivered into the vehicle cabin 1002 being higher at relatively lower temperatures. It will therefore be appreciated that the vehicle cabin temperature threshold maybe any suitable threshold calibrated for the vehicle 1000 and the vehicle cabin 1002. Fragrance perception by vehicle occupants may also vary with an altitude of the vehicle 1002. For example, at lower altitudes, the fragrance may be less perceptible to occupants and the pulse frequency of the fragrance delivery system and / or the concentration of fragrance delivered into the vehicle cabin 1002 may be increased. Conversely, as the altitude of the vehicle 1002 increases, the fragrance may become more perceptible to the occupants and the pulse frequency and / or the concentration of fragrance delivered into the vehicle cabin 1002 may be reduced. As such, the processing means 120 may determine to operate in the pulsed mode if an altitude of the vehicle 1002 reaches a vehicle altitude threshold, in order to restore and / or boost the occupant’s perception of the fragrance, by controlling the fragrance delivery system 10 to delivery fragrance into the vehicle cabin 1002 as a series of pulses and / or by temporarily increasing a concentration of fragrance into the vehicle cabin 1002. It will again be appreciated that the vehicle altitude threshold maybe any suitable threshold calibrated for the vehicle 1000 and the vehicle cabin 1002. The size of the vehicle cabin 1002 may influence an occupant’s perception of the fragrance. For example, a given concentration of the fragrance emitted into a relatively larger vehicle cabin 1002 will be less perceptible than the same concentration of fragrance emitted into a relatively smaller vehicle cabin 1002. As such, delivery of an increased fragrance concentration and / or an increased pulse frequency may be required for relatively larger vehicles (e.g., vehicles having cabins with relatively larger internal volumes). The one or more internal sensors 15 may comprise a fragrance sensor. The fragrance sensor may be configured to detect volatile organic compounds (VOCs) in the air associated with a particular fragrance. The processing means 220 may be configured to determine to operate the fragrance delivery system 10 in the pulsed mode when a fragrance level (e.g., fragrance concentration level) within the vehicle cabin 1002 reaches a threshold fragrance level. As such, if a concentration of the fragrance drops to a given concentration, the processing means 220 may be configured to determine to operate the fragrance delivery system 10 in the pulsed mode, in order to restore and / or boost the occupant’s perception of the fragrance. The threshold fragrance level may be predetermined and based on subjective assessments performed using the VDA 270 standard for smell. The processing means 120 may also be configured to determine to operate the fragrance delivery system 10 in the pulsed mode based on a status of a closure of the vehicle 1000. For example, in the event that a window of the vehicle 1000 is opened, the relative concentration of the fragrance within the vehicle cabin 1002 will drop as a result of ambient air rushing into the vehicle cabin 1002 and the fragrance escaping the vehicle cabin 1002 via the open window, resulting in the perception of the fragrance by occupants of the vehicle 1000 becoming reduced. As such, to restore perception of the fragrance by the occupants of the vehicle 1000, the control system 200 may determine to operate the fragrance delivery system 10 in the pulsed mode. Alternatively, the control system 200 may determine to deactivate the fragrance delivery system 10 in order to save energy and avoid wastage of the fragrance through the open window. The processing means 220 may be configured to reactivate the fragrance delivery system 10 upon receiving an input signal 260 comprising a status of a closure of the vehicle 1000 indicating that the window has been closed. It will of course be appreciated that the processing means 120 may determine to operate the fragrance delivery system 10 in the continuous mode of operation or the pulsed mode of operation based on more than one of the characteristics associated with the interior of the vehicle 1000 described above. As noted above, the fragrance delivery system 10 may comprise a blower unit 26 configured to circulate the fragrance along the fragrance flow path 14 and into the vehicle cabin 1002. The pulsed mode of operation may comprise pulsing operation of the blower unit 26 at a given frequency and / or increasing the intensity of the blower unit 26 in order to increase circulation of the fragrance into the vehicle cabin 1002. Control of the pulse frequency and intensity of the blower unit 26 may be based on pre-determined pulsed mode parameters stored in the memory means 230 (e.g., as look-up tables). The processing means 120 may be configured to dynamically select a set of pulsed mode parameters from the memory means in dependence on at least one of the one or more characteristics associated with the interior of the vehicle 1000 received at step 710. For example, dependence of the pulsed mode parameters on vehicle cabin temperature may be based on a predetermined linear model stored in the memory means 230. When the temperature in the vehicle cabin 1002 drops to a given temperature, the control system 200 may be configured to select a pre-determined set of pulsed mode parameters from the memory means 230 to operate the blower unit 26 at a particular pulse frequency and / or a particular intensity. If the temperature inside the vehicle cabin 1002 falls further, the processing means 220 may be configured to select a different set of pre-determined pulsed mode parameters from the memory means 230, for example, to increase the pulse frequency and / or increase the intensity of the blower unit 26. Similarly, the processing means 220 may be configured to select a pre-determined set of pulsed mode parameters based on the humidity within the vehicle cabin 1002, the altitude of the vehicle 1000, the dimensions of the vehicle cabin 1002, a fragrance level measured within the vehicle cabin 1002 and / or a closure status of the vehicle 1000. Rather than determining the pulsed mode parameters based on stored pulsed mode parameters in the memory means 230, the processing means 120 may be configured to determine the pulsed mode parameters in real time based on how the one or more characteristics associated with the interior of the vehicle 1000 change. For example, as the altitude of the vehicle 1000 increases, the processing means 220 may be configured to reduce a pulse frequency (i.e., increase the time between pulses) and / or intensity of the blower unit 26 of the fragrance delivery system 10 accordingly in order to avoid the fragrance in the vehicle cabin 1002 becoming overpowering for the occupants of the vehicle 1000, for example, based on the fragrance level measured within the vehicle cabin. In a similar manner, as the temperature inside the vehicle cabin 1002 rises (measured either using the one or more internal sensors 15, or inferred from measurements taken by the one or more external sensors 17), the processing means 220 may be configured to reduce a pulse frequency and / or intensity of the blower unit 26 of the fragrance delivery system 10 accordingly in order that the fragrance in the vehicle cabin 1002 is continued to be appropriately perceived by the occupants of the vehicle 1000, for example, based on the fragrance level measured within the vehicle cabin. As a further example, as the humidity within the vehicle cabin 1002 rises (measured either using the one or more internal sensors 15, or inferred from measurements taken by the one or more external sensors 17), the fragrance circulating within the vehicle cabin 1002 may disperse less compared with dispersal at lower humidity levels. As such, the processing means 220 may be configured to increase a pulse frequency (i.e., reduce the time between pulses) and / or intensity of the blower unit 26 of the fragrance delivery system 10 accordingly in order that the fragrance in the vehicle cabin 1002 is continued to be appropriately perceived by the occupants of the vehicle 1000, for example, based on the fragrance level measured within the vehicle cabin. Whilst the pulsed mode of operation has been described in relation to controlling the pulse frequency and / or intensity of a blower unit 26 of the fragrance delivery system 10, the blower unit 26 may optionally comprise a fan fordriving a flow of air through the fragrance delivery unit 12. The pulsed mode of operation may comprise pulsing operation of the fan at a given frequency and / or varying a rotational speed of the fan in order to control the circulation of the fragrance into the vehicle cabin 1002. Control of the pulse frequency and rotational speed of the fan may be based on pre-determined pulse mode parameters stored in the memory means 230 (e.g., as look-up tables), ordetermined in real time, as outlined above. For example, following the scenario described above in which the humidity in the vehicle rises (measured either using the one or more internal sensors 15, or inferred from measurements taken by the one or more external sensors 17), the processing means 220 may be configured to increase a pulse frequency and / or rotational speed of the fan of the fragrance delivery system 10 accordingly in order that the fragrance in the vehicle cabin 1002 is continued to be appropriately perceived by the occupants of the vehicle 1000, for example, based on the fragrance level measured within the vehicle cabin and the VDA 270 standard for smell. The fragrance delivery system 10 may alternatively or additionally comprise a closure such as a hinged flap disposed in the fragrance flow path 14 (for example, the closure may be attached to the exhaust 28 of the fragrance delivery unit 12) and configured to open at a predetermined frequency to allow fragrance to pass along fragrance flow path 14 and into the vehicle cabin 1002. Additionally, or alternatively, the fragrance delivery system 10 may be coupled to a duct providing multiple outlets to the vehicle cabin (e.g. a “Y duct”) having a closure (such as a hinged flap) such that fragrance is dispersed only into regions of the vehicle cabin 1002 where there are occupants present, in order to save energy and prevent wastage of the fragrance. Additionally, or alternatively, the fragrance delivery unit 12 may comprise a nozzle in communication with the exhaust 28 and configured to spray the fragrance into the fragrance flow path 14 at a predetermined frequency and / or concentration. The fragrance delivery system 10 may be operated in a “boosted” mode of operation, where the intensity of the blower unit 26 is increased to a pre-determined level for a predetermined period of time, for example, for a period of 30 to 60 seconds, in order to increase circulation of the fragrance into the vehicle cabin 1002. Such a boosted mode of operation may be required when occupants of the vehicle 1000 have become accustomed to the fragrance circulating within the vehicle cabin 1002 through olfactory fatigue and can no longer perceive the fragrance or perceive the fragrance to a lesser extent than they did previously. The boosted mode of operation can temporality increase the fragrance circulating within the cabin by increasing the intensity of the blower unit 26 for a predetermined period of time, thereby restoring the occupant’s perception of the fragrance. In situations where the fragrance delivery system 10 comprises a closure disposed in the fragrance flow path 14, the boosted mode of operation may increase the frequency at which the closure is configured to open, thereby increasing the amount of fragrance entering the fragrance flow path 14. In situations where the fragrance delivery system 10 comprises a fan disposed in the fragrance flow path 14, the boosted mode of operation may increase a rotational speed of the fan, thereby increasing the amount of fragrance entering the vehicle cabin 1002 along fragrance flow path 14. The boosted mode may be manually activated by an occupant of the vehicle 1000. For example, the occupant may select an input on the touchscreen 18 of the centre console 1008 shown in Figures 2 and 3, or may activate the boost mode remotely (e.g., via an input on an app on a mobile device). This user input may be received as an input signal 260 to the input means 240, the processing means 220 determining the boosted mode of operation in dependence on the received input signal 260. The boosted mode may also be activated automatically by the processing means 220 upon a fragrance level measured by the fragrance sensor falling to a threshold fragrance level. Alternatively, or additionally, activation of the boosted mode by the processing means 220 may occur upon one or more of detection that the vehicle 1000 has been unlocked, detection that one or more occupants have entered the vehicle 1000, detection that a window or door of the vehicle 1000 has been opened or closed, and / or selection of a fresh air input or air recirculation input on the user input device of the centre console 1008. At step 730, the processing means 220 is configured to output a control signal 270 to the fragrance delivery system 10 via the output means 250, the control signal 270 being configured to cause the fragrance delivery system 10 to operate in the determined mode of operation to circulate fragrance into the vehicle cabin 1002. For example, the output means 250 may output the control signal 270 to the blower unit 26 of the fragrance delivery unit 12 to thereby cause the blower unit 26 to operate in the determined mode of operation. 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 control system for controlling a fragrance delivery system of a vehicle, the control system comprising one or more processors collectively configured to:receive an input signal indicative of one or more characteristics associated with an interior of the vehicle;determine a mode of operation of the fragrance delivery system in dependence on at least one of the one or more characteristics associated with the interior of the vehicle; andoutput a control signal to the fragrance delivery system, the control signal being configured to cause the fragrance delivery system to operate in the determined mode to circulate fragrance into a cabin of the vehicle.

2. The control system of claim 1, wherein the one or more characteristics associated with an interior of the vehicle comprise an environmental characteristic and / or a status of a closure of the vehicle.

3. The control system of claims 1 or 2, wherein the one or more processors are collectively configured to determine at least one of a pulsed mode of operation and a continuous mode of operation.

4. The control system of claim 3, wherein the one or more processors are collectively configured to determine the pulsed mode of operation of the fragrance delivery system in dependence on at least one of the one or more characteristics associated with the interior of the vehicle reaching a first characteristic threshold.5 The control system of claim 4, wherein the one or more characteristics associated with the interior of the vehicle comprise a fragrance level within the cabin of the vehicle, and wherein the one or more processors are collectively configured to output a control signal to operate the fragrance delivery system in the pulsed mode of operation when the fragrance level within the cabin of the vehicle reaches a threshold fragrance level.

6. The control system of any of claims 3 to 5, wherein the one or more processors are collectively configured to determine one or more parameters of the pulsed mode of operation in dependence on at least one of the one or more characteristics associated with the interior of the vehicle.

7. The control system of claim 6, wherein the one or more parameters of the pulsed mode of operation comprise one or more of:operation of the fragrance delivery system in a continuous mode of operation for a first time period, deactivation of the fragrance delivery system for a second time period following the first time period, and operation of the fragrance delivery system in the continuous mode of operation for a third time period following the second time period; andoperation of the fragrance delivery system at a first intensity for a first time period, and operation of the fragrance delivery system at a second intensity for a second time period, wherein the first intensity is different to the second intensity.

8. The control system of any preceding claim, wherein the one or more processors are collectively configured to select a mode of operation from a plurality of pulsed modes of operation in dependence on at least one of the one or more characteristics associated with the interior of the vehicle, wherein the one or more processors are collectively configured to output a control signal to cause the fragrance delivery system to operate in the selected pulsed mode of operation.

9. The control system of any preceding claim, wherein the fragrance delivery system comprises a plurality of fragrances, and wherein the one or more processors are collectively configured to determine the mode of operation based on which of the plurality of fragrances is selected.

10. The control system of any preceding claim, the fragrance delivery system comprises a blower unit, and wherein the one or more processors are collectively configured output a control signal configured to cause the blower unit to operate in the determined mode to circulate fragrance into the cabin of the vehicle.

11. The control system of claim 10, wherein the one or more processors are collectively configured to cause the blower unit of the fragrance delivery system to operate at an elevated mode of operation for a predetermined time period in response to:user input provided to a human machine interface, HMI, of the vehicle; ora fragrance level within the cabin of the vehicle reaching a threshold fragrance level.12, A system comprising the control system of any preceding claim and a fragrance delivery system mounted within a vehicle.

13. A vehicle comprising the system of claim 12 or the control system of claims 1 to 11.

14. A method for controlling a fragrance delivery system of a vehicle, the method comprising:receiving an input signal indicative of one or more characteristics associated with an interior of the vehicle;determining a mode of operation of the fragrance delivery system in dependence on at least one of the one or more characteristics associated with the interior of the vehicle; andoutputting a control signal to the fragrance delivery system, the control signal being configured to cause the fragrance delivery system to operate in the determined mode to circulate fragrance into a cabin of the vehicle.

15. Computer readable instructions which, when executed by one or more processors, cause the one or more processors to perform the method according to claim 14.

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