Cooking appliance and method for limiting cooking utensil temperatures using dual control modes
AssigneeHaier US Appliance Solutions, Inc.
InventorJames Carter Bach
Life of this patent
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Abstract
Cooking appliances and methods for operating cooking appliances are provided. In one exemplary embodiment, a method for operating a cooking appliance is provided. The method includes providing power to the heating source according to a first control mode; determining whether to transition from the first control mode to a second control mode and, if so, then providing power to the heating source according to the second control mode. The method further includes determining whether to transition to the first control mode and, if so, then returning to providing power to the heating source according to the first control mode. The cooking appliances and methods include features for limiting cooking utensil temperatures using dual control modes.
Claims12
A cooking appliance, comprising:
- a heating source;
- a temperature sensor, the temperature sensor positioned to sense the temperature Tsensed of a bottom surface of a cooking utensil when the cooking utensil is placed on or adjacent to the heating source;
- an energy control device for modulating the power provided to the heating source;
- a controller having a memory and a processor for executing programming instructions, the controller in operative communication with the temperature sensor and the energy control device, the controller programmed for
- providing power to the heating source according to a first control mode,
- comparing the temperature Tsensed sensed by the temperature sensor to a target temperature limit Tlimit to determine if the temperature Tsensed of the cooking utensil is greater than the target temperature limit Tlimit and, if so, then
- transitioning to a second control mode such that power is provided to the heating source according to the second control mode,
- comparing the temperature Tsensed sensed by the temperature sensor to a threshold temperature Tresume to determine if the temperature Tsensed of the cooking utensil is less than the threshold temperature Tresume and, if so, then
- returning to providing power to the heating source according to the first control mode,
- wherein power is provided to the heating source in the first control mode using a non-linear proportional control algorithm having an exponential proportional term, and
- wherein power is provided to the heating source in the second control mode using a linear proportional or proportional-integral control algorithm.
A cooking appliance, comprising:
- a heating source;
- a temperature sensor, the temperature sensor positioned to sense the temperature Tsensed of a bottom surface of a cooking utensil when the cooking utensil is placed on or adjacent to the heating source;
- an energy control device for modulating the power provided to the heating source;
- a controller, the controller in operative communication with the temperature sensor and the energy control device, the controller configured for
- providing power to the heating source according to a first control mode,
- comparing the temperature Tsensed sensed by the temperature sensor to a target temperature limit Tlimit to determine if the temperature Tsensed of the cooking utensil is greater than the target temperature limit Tlimit and, if so, then
- providing power to the heating source according to the second control mode,
- comparing the temperature Tsensed sensed by the temperature sensor to a threshold temperature Tresume to determine if the temperature Tsensed of the cooking utensil is less than the threshold temperature Tresume and, if so, then
- returning to providing power to the heating source according to the first control mode,
- wherein power is provided to the heating source in the first control mode using a non-linear proportional control algorithm wherein the power provided to the heating source equals the product of a first proportional gain factor Kp1 and a temperature error Terr and the product is raised to a power of N,
- wherein power is provided to the heating source in the second control mode using a linear proportional-integral control algorithm wherein the power provided to the heating source equals the sum of an integral term I and the product of a second proportional gain factor Kp2 and the temperature error Terr.
Dependencies are inferred from the claim text.