Patent EP0187629A2 successfully refreshed from Google Patents.
EP0187629A2
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A method of controlling the heating of an aqueous load in a cooking utensil
Assignee: Electrolux AB
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Filing: 1985-12-19
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Granted: —
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Expires: 2005-12-19
Abstract
Abstract A method of controlling the heating of an aqueous load in a cooking utensil, which is placed on an electrically heated cooking plate or hob. During the heating process, at repeated occasions measured values are collected relating to the temperature (Tp) of the cooking plate and the temperature (T k ) of the cooking utensil, respectively, and at each occasion of measurement and end temperature (T v end ) of the load is calculated from the collected measured values, which end temperature would be achieved if the power supply to the cooking plate was disrupted at the time of calculation. The power supply to the cooking plate is disrupted when the calculated and temperature (T v end ) equals a preset temperature value.
Inventors
- 👤 Claes Johan Henning Axelson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 10:46
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/08; G; G05; G05D; G05D23/00; G05D23/19
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
A method of controlling the heating of an aqueous load in a cooking utensil, which is placed on an electrically heated cooking plate or hob, characterized in that during the heating process at repeated occasions measured values are collected relating to the temperature (T p ) of the cooking plate and the temperature (T k ) of the cooking utensil, respectively, and that at each occasion of measurement an end temperature of the load(T v end) is calculated from the collected measured values, which end temperature would be achieved if the power supply to the cooking plate was disrupted at the time of calculation and that the said power supply is disrupted at the time when the calculated end temperature (T v end) equals a preset temperture value.
Claim 2
Independent Claim
128 words
A method of controlling the heating of an aqueous load in a cooking utensil, which is placed on an electrically heated cooking plate or hob, characterized in that during the heating process at repeated occasions measured values are collected relating to the temperature (T p ) of the cooking plate and the temperature (T k ) of the cooking utensil, respectively, and that at each occasion of measurement an end temperature of the load(T v end) is calculated from the collected measured values, which end temperature would be achieved if the power supply to the cooking plate was disrupted at the time of calculation and that the said power supply is disrupted at the time when the calculated end temperature (T v end) equals a preset temperture value.
Claim 3
Dependent Claim
84 words
A method according to Claim 1, characterized in that the end temperature of the load (T v end) is calculated under consideration of the temperature of the cooking plate (T p ) , the calculated temperature of the load (T v calc), the thermal resistance(R pk ) between the cooking plate and the cooking utensil, the thermal mass (m v ) of the load and losses in the cooking plate ( 4 p loss) as well as in the load ( ∅ v loss)
Claim 4
Dependent Claim
79 words
A method according to Claim 2, characterized in that the calculated temperature of that load, T cale , is calculated according to the relation where T k is the temperature of the cooking utensil, R vv is an estimated value of the thermal resistance between the cooking utensil and the load according to the relation Rp k is the thermal resistance between the cooking plate and the cooking utensil, and T p is the temperature of the cooking plate.
Claim 5
Dependent Claim
105 words
A method according to Claim 3, characterized in that the thermal resistance (Rp k ) between the cooking plate and the cooking utensil is calculated according to the relation where p is the power supplied to the cooking utensil and calculated according to the relation Pmax is the maximum power of the cooking plate, ∅p loss = b . T p is the losses to the surrounding from the cooking plate and represents the power required for the heating of the cooking plate itself, where m p is the thermal mass of the cooking plate and is the time derivate of the cooking plate temperature.
Claim 6
Dependent Claim
30 words
A method according to Claim 4, characterized in that the thermal mass m is calculated from the relation v , where is the time derivate of the cooking utensil temperature.
Claim 7
Dependent Claim
169 words
A method according to Claim 5, characterized in that the end temperature (T v end) of the load is determined by an iterative method according to which for each pair of measured values (T k , T p ) a temperature equalization process is simulated such that, firstly, the temperature of the load f r calc ) is determined out of the measured temperature values T k , T p and then a corresponding calculation is made after the time intervals Δ t, 2 Δ t, 3 Δ t etc., out of the values of the cooking plate temperature (T p , and the load temperature (T v calc), as determined at the immediate preceding time point of calculation, wherein each calculated value of the load temperature (T v calc ) is compared with the preceding value and the end temperature of the load (T v end) is determined to be the first value of the load temperature (T v calc ) that falls below the immediate preceding value.
Claim 8
Dependent Claim
98 words
A method according to Claim 6, characterized in that for each pair of measured values (T k , Tp) the load temperature (T v calc ) is determined and there are set up the heat quantities and m is a constant, the heat quantities being used for determining of new values of the cooking plate temperature (Tp) and the load temperature (T v calc ) respectively, according to the relations the value T v calc (t+ Δ t) being compared with the value T v calc (t) in determining the end temperature T v end) of the load.
Claim 9
Dependent Claim
54 words
A method according to Claim 7, characterized in that the value of the cooking plate temperature (T p end) which corresponds to the end temperature (T v end) of the load is determined and used as the control temperature for the subsequent switching in of a lower heating power in a ready cooking process.
Claim 10
Independent Claim
51 words
A method according to any of the preceding claims, characterized in that the end temperature of the load is calculated even after the disruption of the power supply to the cooking plate and that correction is made by additional power pulses if the calculated temperature falls below the preset temperature value.
Claim 11
Independent Claim
23 words
A method according to any of the preceding claims, characterized in that the preset temperature value is the cooking temperature of the load.
References Cited (Backward Citations)
No citation records indexed.
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