The present invention relates to a dispensing device for at least one air treatment agent comprising at least one airborne agent detector operable to detect airborne agents in the air; receiving means for receiving at least one source of air treatment agent; and control means for releasing an amount
The present invention relates to a dispensing device for at least one air treatment agent comprising at least one airborne agent detector operable to detect airborne agents in the air; receiving means for receiving at least one source of air treatment agent; and control means for releasing an amount of at least one air treatment agent from a source thereof received in the receiving means when a current airborne agent level detected by the airborne agent detector deviates from a background airborne agent level detected by the airborne agent detector by more than a predetermined amount, wherein the background airborne agent level is calculated by the device. The present invention also relates to a method of dispensing at least one air treatment agent.
대표청구항▼
1. A dispensing device for at least one air treatment agent which device operates to detect the concentration of chemical compounds in the environment surrounding the device, said device comprising: at least one airborne agent detector which detects airborne agents in the air in the environment surr
1. A dispensing device for at least one air treatment agent which device operates to detect the concentration of chemical compounds in the environment surrounding the device, said device comprising: at least one airborne agent detector which detects airborne agents in the air in the environment surrounding the device including a current airborne agent level;at least one receiving means configured to receive at least one source of an air treatment agent;a control means which calculates a background airborne agent level by calculating an average airborne agent level over a longer time period than the current airborne agent level, and which control means releases an amount of the at least one air treatment agent from the source when received in the device and when the control means calculates that a current airborne agent level deviates from a background airborne agent level by more than a predetermined amount. 2. A dispensing device according to claim 1, in which the control means calculates the deviation of the current airborne agent level from the background airborne agent level by subtracting the background level from the current airborne agent level and dividing that amount by the background level value. 3. A dispensing device according to claim 1, in which the control means calculates the current airborne agent level by calculating an average of a predetermined number of most recent readings of the detector. 4. A dispensing device according to according to claim 1, wherein the background airborne agent level is calculated as an average of the levels of airborne agent detected by the device throughout the duration of a particular operational mode of the device. 5. A dispensing device according to claim 1, wherein the control means calculates the background airborne agent level by calculating an average of a predetermined number of some or all of 10 to 10,000 of the most recent readings of the detector. 6. A dispensing device according to claim 1, in which the background airborne agent level and the current airborne agent level are temporally offset. 7. A dispensing device according to claim 1, in which the control means calculates the background airborne agent level based on calculating a series of averages from rolling windows of measurements from the detector. 8. A dispensing device according to claim 7, in which each rolling window is an average of between two and ten readings. 9. A dispensing device according to claim 7, in which the windows do not overlap. 10. A dispensing device according to claim 7, in which the windows span a time period of between 5 and 30 minutes. 11. A dispensing device according to claim 7, in which the control means operates to discard the oldest window when a new window becomes available. 12. A dispensing device according to claim 1, in which the control means operate to adjust the predetermined level of deviation from the background level that results in air treatment agent being released. 13. A dispensing device according to claim 1, in which the control means operate to activate emanation acceleration means. 14. A dispensing device according to claim 1, in which the device further comprises a first heating element which provides a first level of dispensing of at least one air treatment agent. 15. A dispensing device according to claim 14, in which the device further comprises a second heating element, and/or a fan, and wherein at least one of the first heating element, the second heating element and the fan provide a boost to the emanation of at least one air treatment agent, in response to the control means. 16. A dispensing device according to claim 1, wherein the control means cause a background of a first air treatment agent to be dispensed, and a second air treatment agent to be dispersed on detection of the deviation of the current level from the background level. 17. A dispensing device according to claim 1, in which the dispensing device comprises a source of at least one air treatment agent. 18. A dispensing device according to claim 17, in which each source of air treatment agent has its own heater and/or fan to assist dispensing. 19. A dispensing device according to claim 1, wherein the at least one airborne agent detector has a sensor heater. 20. An automated method for dispensing at least one air treatment agent comprising the steps of: providing a dispensing device which operates to detect the concentration of chemical compounds in the environment surrounding the device, said device comprising;at least one airborne agent detector which detects airborne agents in the air in the environment surrounding the device including a current airborne agent level;at least one receiving means configured to receive at least one source of an air treatment agent;control means; and,operating the device during which the control means calculates a background airborne agent level by calculating an average airborne agent level over a longer time period than the current airborne agent level and, and which control means releases an amount of the at least one air treatment agent from the source when present in the device and when the control means calculates that a current airborne agent level deviates from a background airborne agent level by more than a predetermined amount. 21. A method according to claim 20, in which the airborne agent level is calculated by calculating an average of a predetermined number of the most recent readings of the detector. 22. A method according to claim 20, wherein the background airborne agent level is calculated as an average of the levels of airborne agent detected by the device throughout the duration of a particular operational mode of the device. 23. A method according to claim 20, wherein the control means calculates the background airborne agent level by calculating an average of a predetermined number of some or all of 10 to 10,000 of the most recent readings of the detector. 24. A method according to claim 20, in which the background airborne agent level and the current airborne agent level are temporally offset. 25. A method according to claim 20, in which the background level is calculated based on a series of averages from rolling windows of measurements from the detector. 26. A method according to claim 25, in which the oldest window is discarded when a new window becomes available. 27. A method according to claim 20, wherein the dispensing device comprises a source of at least one air treatment agent.
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이 특허를 인용한 특허 (1)
Dubois, Lawrence H.; Ware, Donald, Liner-based dispenser.
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