EP1159566B1 - A cooker hood - Google Patents
A cooker hood Download PDFInfo
- Publication number
- EP1159566B1 EP1159566B1 EP00920427A EP00920427A EP1159566B1 EP 1159566 B1 EP1159566 B1 EP 1159566B1 EP 00920427 A EP00920427 A EP 00920427A EP 00920427 A EP00920427 A EP 00920427A EP 1159566 B1 EP1159566 B1 EP 1159566B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- sensitive
- sensors
- fat
- water vapour
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
Definitions
- the invention relates to a cooker hood controlled by at least one sensor element reacting to fumes and vapours given off from the food to be cooked within the catchment range of said cooker hood.
- Most cooker hoods are disposed generally above the food giving off fumes and vapours but the present invention is not limited to such a configuration.
- Cooker hoods which are controlled by e.g. a humidity sensor or a temperature sensor, commencing extraction of fumes or increasing the rate when the humidity or temperature reaches a pre-determined level. It is also known to use a number of sensors, each sensitive to particular compounds in gas form, to control a cooker hood. It appears that the known constructions which depend on sensors for chemicals all only react to a very specific range of chemical susbstances, and they are inherently very sensitive to contamination which means that their performance and service life in a kitchen environment is less than desired.
- Patent publication DE-A-3 039 246 discloses a cooker hood controlled by at least one sensor element reacting to fumes and vapours given off from the food to be cooked. A multitude of sensor elements are used, the combined responses of said sensor elements provide a controlling indication of the intensity of the cooking process.
- the output from each sensor is compared to corresponding data stored in a permanent memory.
- the data stored in permanent memory is obtained during a calibration run with foods of predetermined compositions being heated with a predetermined amount of heat at a predetermined rate.
- the cooking of food in conjunction with a cooker hood proceeds as follows: the heating provided by the cooker heats the food, and a series of chemical processes are activated, each creating vapours, the mixture and concentrations of which may be detected as specific to the particular process by means of dedicated sensors. At low temperatures water vapour is given off, and at higher temperatures certain oxidation of some of the components in the food takes place, and at still higher temperatures fatty components are also given off as vapours, and from parts of the food covered with the most heat tolerant components of the fat, various forms of decomposition may also occur. All of these processes provide quite specific volatile compounds. Known sensors for cooker hood control are directed to the detection of such compounds and to activate the fan or blower.
- three semiconductor gas sensors are mounted generally above the cooking area, and above the grease filter and below the impeller of the fan.
- they are semiconductor sensors which change their electrical resistance when influenced by the vapours they respond to
- Sensor 1 is sensitive to water vapour but not sensitive to grease and fat.
- Sensor 2 is sensitive to both water vapour and to fat vapour but influence the resistance in opposite directions.
- Sensor 3 has a high sensitivity to fat vapour but lower sensitivity to water vapour.
- the sensors When power is first applied to the control, the sensors are monitored for a period of time (typically 5 minutes), this in order to make sure that the sensors are thermally and electrically stable and to gain a knowledge (to be stored) of the sensor output pattern that represents a clean kitchen atmosphere. After this time the monitoring programme starts. All the resistance values (signal levels) of all three sensors are continously monotored. The signals are read into RAM memory every 30 seconds (optional), and this value is compared to a rolling average over 5 minutes (optional). Both of times indicated are pre-programmed and adjusted to obtain a reliable and speedy response, with a minimum of false starts, nuisance speed changes and false shut downs.
- a period of time typically 5 minutes
- Sensor 1 and 3 have a high signal stability over time under clean air conditions and are therefore mainly used to detect and confirm the existence of and return to clean air conditions.
- Sensor 2 does not have a stable signal over time in clean air, bur responds quickly to levels of fat vapour and is therefore mainly used to select fan speed changes, rather than to switch the fan on or off.
- the following are the control parameters of the present embodiment:
- the fan switches from off to speed level 1 - the ratio (sensor1 at 30 sec signal)/(sensor1 at 5 min average) is ⁇ 0.9 and the ratio (sensor3 at 30 sec signal)/(sensor3 at 5 min average) is ⁇ 0.85.
- the fan switches from level 1 to level 2 - the ratio (sensor1 at 30 sec signal)/( sensor1 at 5 min average) is ⁇ 0.75 and the ratio (sensor3 at 30 sec signal)/(sensor3 at 5 min average) is ⁇ 0.5, or sensor 2 drops below the value 100kohm.
- the fan switches from level 2 to level 3 - the ratio (sensor3 at 30 sec signal)/(sensor3 at 5 min average) is ⁇ 0.3, or sensor 3 drops below 50kohm. Clean air - the fan is switched off Light steam/water vapour - fan speed 1 Heavy steam/water vapour or light fat vapours - fan speed 2 Heavy fat vapours - fan speed 3
- the fan can switch directly from level 0 to level 2 or level 3, and it can also switch back from level 3 to level 1 or level 2 before switching off, in dependence of the precise inputs provided by the sensors.
Abstract
Description
Clean air - the fan is switched off
Light steam/water vapour - fan speed 1
Heavy steam/water vapour or light fat vapours - fan speed 2
Heavy fat vapours - fan speed 3
Claims (3)
- A cooker hood controlled by at least one sensor element reacting to fumes and vapours given off from the food to be cooked within the catchment range of said cooker hood, wherein a multitude of sensor elements are used and the combined responses of said sensor elements provide a controlling indication of the intensity of the cooking process, characterized in that three sensors are used, a first sensor being sensitive to water vapour but not sensitive to grease and fat vapours, a second sensor being sensitive to both water vapour and to fat vapour, with opposing reactions, and a third sensor having a high sensitivity to fat vapours and a low sensitivity to water vapour.
- A cooker hood according to claim 1, characterized in that the output from each sensor is compared to corresponding data stored in a permanent memory.
- A cooker hood according to claim 2, characterized in that the data stored in the permanent memory is obtained during a calibration run with food of a predetermined composition being heated with a predetermined amount of heat at a predetermined rate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK00920427T DK1159566T3 (en) | 1999-04-29 | 2000-05-01 | Extractor hood |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA199900597 | 1999-04-29 | ||
DK59799 | 1999-04-29 | ||
PCT/DK2000/000218 WO2000066950A1 (en) | 1999-04-29 | 2000-05-01 | A cooker hood |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1159566A1 EP1159566A1 (en) | 2001-12-05 |
EP1159566B1 true EP1159566B1 (en) | 2004-02-25 |
Family
ID=8095371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00920427A Expired - Lifetime EP1159566B1 (en) | 1999-04-29 | 2000-05-01 | A cooker hood |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1159566B1 (en) |
AT (1) | ATE260445T1 (en) |
AU (1) | AU4101200A (en) |
DE (1) | DE60008506T2 (en) |
ES (1) | ES2215636T3 (en) |
PT (1) | PT1159566E (en) |
WO (1) | WO2000066950A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102374561A (en) * | 2010-08-17 | 2012-03-14 | 博西华电器(江苏)有限公司 | Extractor hood having flue gas automatic test device and control method for extractor hood |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2397038B1 (en) * | 2011-06-30 | 2014-04-07 | BSH Electrodomésticos España S.A. | Domestic apparatus for preparing food by heating in a medium and method for operating such a domestic appliance |
EP2758719B1 (en) * | 2011-09-13 | 2017-04-05 | Sirius Products Limited | A method of operating a system for extracting air |
CN109373387B (en) * | 2018-11-02 | 2019-09-27 | 马鞍山市博浪热能科技有限公司 | A kind of dynamic blade separate type impeller smoke exhaust ventilator |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3625135A (en) * | 1970-04-22 | 1971-12-07 | Honeywell Inc | Automatically controlled cooking area ventilating system |
DE3039246A1 (en) * | 1980-10-17 | 1982-05-19 | Gebrüder Mayer KG, 5760 Arnsberg | Kitchen fumes exhaust hood - has sensor element facing cooker hob, responsive to humidity, steam, smoke, or heat, or all together |
US4903685A (en) * | 1989-01-24 | 1990-02-27 | Melink Stephen K | Variable exhaust controller for commercial kitchens |
DE19522300C2 (en) * | 1995-06-20 | 1997-05-28 | Berufsfoerderungswerk Heidelbe | Electric safety device for hotplates |
-
2000
- 2000-05-01 ES ES00920427T patent/ES2215636T3/en not_active Expired - Lifetime
- 2000-05-01 WO PCT/DK2000/000218 patent/WO2000066950A1/en active IP Right Grant
- 2000-05-01 AU AU41012/00A patent/AU4101200A/en not_active Abandoned
- 2000-05-01 EP EP00920427A patent/EP1159566B1/en not_active Expired - Lifetime
- 2000-05-01 AT AT00920427T patent/ATE260445T1/en not_active IP Right Cessation
- 2000-05-01 PT PT00920427T patent/PT1159566E/en unknown
- 2000-05-01 DE DE60008506T patent/DE60008506T2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102374561A (en) * | 2010-08-17 | 2012-03-14 | 博西华电器(江苏)有限公司 | Extractor hood having flue gas automatic test device and control method for extractor hood |
CN102374561B (en) * | 2010-08-17 | 2016-06-15 | 博西华电器(江苏)有限公司 | There is range hood and the control method thereof of automatic flue gas detection device |
Also Published As
Publication number | Publication date |
---|---|
PT1159566E (en) | 2004-06-30 |
ATE260445T1 (en) | 2004-03-15 |
EP1159566A1 (en) | 2001-12-05 |
DE60008506T2 (en) | 2004-12-23 |
WO2000066950A1 (en) | 2000-11-09 |
ES2215636T3 (en) | 2004-10-16 |
DE60008506D1 (en) | 2004-04-01 |
AU4101200A (en) | 2000-11-17 |
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