| 摘要 |
PURPOSE:To prevent a dangerous condition such as burning or generating smoke of food under an abnormal use of heating device by a method wherein the heating device is constructed such that an entire heating time is made substantially equal even if a cooking information is detected by either one of the main sensor means or a dependent sensor means. CONSTITUTION:When a heating is started, a relative humidity in the heating chamber 3 and an exhaust guide 10 is kept at a range found in a wrap even if water vapour is produced from the food. In turn, due to an increased temperature of the food, the relative humidity is continued to decrease. During this period of time, the water vapour in the food is started to leak, the relative humidity is turned to increase at b and it is judged that the humidity is sensed when the value is varied from the minimum vaue by DELTARH. In turn, a proper selection of the sensing level DELTAT of the temperature sensor causes the point d to be positioned after the point c. If it is assumed that the time required until the relative humidity sensor 12 executes a sensing operation is defined as TH and the time required until the thermistor temperature sensor 11 detects the temperature is defined as TTH, the remaining heating time is calculated as KH.TH. If it is assumed that a relation of KH=KTH.(1+TTH)/(1+TH) is defined, it is possible to obtain the substantial same finished effect in case that any one of the sensors is applied for sensing operation. |
