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Apparatus and method for detecting abnormal temperature rise associated with a cooking arrangement
申请公布号：US2005016990(A1)
申请号：US20040867301
申请日期：2004.06.14
申请公布日期：2005.01.27
发明人：WILKINS PETER RAVENSCROFT;SWANN NEIL;DAVIS FREDERICK JAMES;PEARCE ISOBEL
分类号：H05B3/74;H05B6/06;(IPC1-7):H05B1/02
主分类号：H05B3/74
摘要：Apparatus and a method are provided for detecting an abnormal rise in temperature associated with a combination of a cooking utensil (10) and a cooking zone (8) of a cooking surface (4) overlying an electric heater (6). The apparatus has a first temperature-responsive device (24) is provided within the heater and adapted to monitor temperature of the cooking surface (4). A second temperature-responsive device (26) is provided within the heater and adapted to monitor temperature of the cooking utensil (10) through the cooking surface (4) to provide an electrical output as a function of temperature of the cooking utensil. Means (28) is provided for calculating first and second derivatives (D1, D2) with time of the temperature sensed by the second temperature-responsive device (26) over an operating temperature range of the heater. Means (28) is provided to determine stabilisation of the first derivative (D1) within stabilising threshold limit values. Means (28) is provided to thereafter compare the first and second derivatives (D1, D2) with first and second predetermined threshold values and to detect an abnormal rise in temperature when the first and second predetermined threshold values are exceeded.