Food processor with boiling point recognition

Patent metadata

Field	Value
Publication number	US-11311142-B2
Application number	US-202016827173-A
Country	US
Kind code	B2
Filing date	Mar 23, 2020
Priority date	Mar 29, 2019
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

The present disclosure relates to a food processor for preparing a food in a pot. The food processor comprises the pot, a heating element for heating the pot or a food in the pot, and a temperature sensor for detecting a temperature TSUR, TMED of the pot or a food in the pot. The food processor comprises a monitoring device which is configured such that the monitoring device can detect an exceeding of a boiling point SP of a food in the pot on the basis of a temperature measurement value TNTC(k) of the temperature sensor and an electrical measurement value u(k), which depends on an energy supply to the heating element. Furthermore, the present disclosure relates to a process and a computer program product. A food processor with boiling point detection can thus be made available with particularly low production effort.

First claim

The invention claimed is:

1. A food processor comprising:
a pot;
a heating element for heating the pot and a food in the pot;
a temperature sensor configured to detect a temperature of the pot; and
a control device electrically connected to the heating element to provide energy to power the heating element, wherein the control device is electrically coupled to the temperature sensor to receive signals from the temperature sensor, and wherein the control device includes a monitoring device and is configured to provide to the monitoring device a temperature measurement value T NTC (k) indicating the temperature of the pot during a current monitoring cycle (k) and an electrical operating power measurement value u(k) indicating an amount of energy provided to the heating element during the current monitoring cycle (k), wherein the monitoring device is configured to
determine, during the current monitoring cycle (k), that the food in the pot is boiling in response to an estimated disturbance variable value s̆(k+1) of a next monitoring cycle (k+1) being greater than zero, wherein the estimated disturbance variable value s̆(k+1) is indicative of a value of heat loss resulting from boiling of the food in the pot, wherein the next monitoring cycle (k+1) is a monitoring cycle immediately following the current monitoring cycle (k), and
determine a steam rate of the food in the pot based on the estimated disturbance variable value s̆(k+1).

2. The food processor of claim 1 , wherein the monitoring device is configured to determine that the food in the pot is not boiling in response to the estimated disturbance variable value s̆(k+1) approaching zero.

3. The food processor of claim 1 , wherein the monitoring device is configured to determine a change in a predicted estimated temperature at a bottom of the pot value T̆ P SUR (k) based on the electrical operating power measurement value u(k) and the estimated disturbance variable value s̆(k) of the current monitoring cycle (k).

4. The food processor of claim 3 , wherein the monitoring device is configured to determine the estimated disturbance variable value s̆(k+1) of the next monitoring cycle (k+1) in temporally successive cycles.

5. The food processor of claim 4 , wherein the monitoring device is configured to determine the estimated disturbance variable value s̆(k+1) of the next monitoring cycle (k+1) using as input variables the temperature measurement value T NTC (k) determined during the current monitoring cycle (k), the the electrical operating power measurement value u(k) determined during the current monitoring cycle (k), and the estimated disturbance variable value s̆(k) of the current monitoring cycle (k) determined during the previous monitoring cycle (k−1).

6. The food processor of claim 1 , wherein the monitoring device is configured to output a plurality of predicted variables including at least one of a predicted disturbance variable, a predicted temperature measurement, a predicted pot temperature, and a predicted food temperature.

7. The food processor of claim 1 , wherein the monitoring device is configured to determine at least one correction output variable corresponding to at least one of a correction disturbance variable, a correction temperature measurement, a correction pot temperature, and a correction food temperature.

8. The food processor of claim 1 , wherein the monitoring device is configured to determine at least one estimated output variable corresponding to at least one of an estimated disturbance variable, an estimated temperature measurement, an estimated pot temperature, and an estimated food temperature.

9. The food processor of claim 8 , wherein the monitoring device determines the at least one estimated output variable based on at least one of predicted output variables and correction output variables.

10. The food processor of claim 6 , wherein the disturbance variable corresponds to a sum of the predicted disturbance variable and a correction disturbance variable.

11. The food processor of claim 7 , wherein the disturbance variable corresponds to a sum of a predicted disturbance variable and the correction disturbance variable.

12. The food processor of claim 1 , wherein the monitoring unit is configured to determine the steam rate of the food in the pot based on an amplitude of a signal of the estimated disturbance variable value s̆(k+1), and wherein the steam rate is a rate of release of steam by the food in the pot per time unit.

13. The food processor of claim 12 , wherein the monitoring unit is configured to determine the steam rate of the food in the pot using the amplitude of the signal of the estimated disturbance variable value s̆(k+1) by means of a correlation such that the larger the amplitude, the higher the steam rate.

14. A food processor comprising:
a pot;
a heating element for heating the pot or a food in the pot;
temperature sensor configured to detect a temperature of the pot; and
a control device electrically connected to the heating element to provide energy to power the heating element, wherein the control device is electrically coupled to the temperature sensor to receive signals from the temperature sensor, and wherein the control device includes a monitoring device and is configured to provide to the monitoring device a temperature measurement value T NTC (k) indicating the temperature of the pot during a current monitoring cycle (k) and an electrical operating power measurement value u(k) indicating an amount of energy provided to the heating element during the current monitoring cycle (k), wherein the monitoring device is configured to
determine, during the current monitoring cycle (k), that the food in the pot is boiling in response to an estimated disturbance variable value s̆(k+1) of a next monitoring cycle (k+1) being greater than zero, wherein the estimated disturbance variable value s̆(k+1) is indicative of a value of heat loss resulting from boiling of the food in the pot, wherein the next monitoring cycle (k+1) is a monitoring cycle immediately following the current monitoring cycle (k),
wherein the estimated disturbance variable value s̆(k+1) of the next monitoring cycle (k+1) is a sum of a predicted estimated disturbance variable value s̆ P (k+1) of the next monitoring cycle (k+1) and a corrected estimated disturbance variable value s̆ K (k+1) of the next monitoring cycle (k+1),
wherein the predicted estimated disturbance variable value s̆ P (k+1) is set to equal to an estimated disturbance variable value s̆(k) of the current monitoring cycle (k) determined during a previous monitoring cycle (k−1), wherein the previous monitoring cycle (k−1) is a monitoring cycle immediately preceding the current monitoring cycle (k),
wherein the corrected estimated disturbance variable value s̆ K (k+1) is determined based on a difference between the temperature measurement value T NTC (k) and an estimated temperature measurement value T̆ NTC (k) of the current monitoring cycle (k) determined during the previous monitoring cycle (k−1), wherein the corrected estimated disturbance variable value s̆ K (k+1) is determined based on a product of the difference and an adjustment coefficient (I).

Assignees

• Vorwerk Co Interholding

Inventors

• Mosebach Andrej
• Yan Wenjie
• Tietz Sebastian
• Kraut-Reinkober Stefan
• Sickert Michael

Classifications

• A47J2202/00

  Devices having temperature indicating means · CPC title

• A23L5/15

  using wave energy, irradiation, electrical means or magnetic fields, e.g. oven cooking or roasting using radiant dry heat · CPC title

• A23V2002/00

  Food compositions, function of food ingredients or processes for food or foodstuffs · CPC title

• A47J43/046

  with tools driven from the bottom side · CPC title

• A47J27/21

  Water-boiling vessels, e.g. kettles · CPC title