Patent ID: 6403929
Filing Date: 2002-06-11
Classification: H05B

Abstract:
A method for sensing overheating of a food container positioned on a glass ceramic cooking hob having electrical heating elements provided for predefined regions of said hob, said method comprising the steps of:continuously measuring the variation in temperature of the region of the cooking hob during the activation of a corresponding heating element on which said container is positioned, wherein the temperature of the container is related to the temperature of the region on which the container lies; and halting said activation when said temperature undergoes a sudden increase relative to the substantially constant temperature value maintained with time during activation of the heating element associated with a state of overheating of said container wherein the halting step further comprises the step of: stopping the electrical feed to the heating element when the temperature reached by that region of the cooking hob corresponding to said element attains a first predefined temperature limit, the stoppage being followed by a successive evaluation of the temperature of said region, restoring electrical feed to the heating element if the measured temperature of said region of the cooking hob falls to below a second predefined temperature limit, permanently halting electrical feed to the heating element if, following a further temperature evaluation, it is found that the temperature has risen for a second time above the first temperature limit.