| 摘要 |
<p>IIn an automated microwave oven, there is provided a gas sensor (7) within a passageway for outgoing air from the heating chamber (4). In addition to a switching means (3) for controlling an enabling circuit for a microwave source (9) such as a magnetron, a cook switch (2) is provided which is common to all of the different kinds of food to be heated. A microcomputer (15) is provided which generates a heating stop instruction for the enabling circuit for the microwave source (9) in response to not only the output signal from the gas sensor (7) but also a stored program in the microcomputer (15). Based upon a stored program in the microcomputer (15). Based upon the rate of timewise variation in the output signal from the gas sensor (7), the microcomputer (15) decides roughly what kind of food is being heated and then establishes an intended final level which the output of the gas sensor (7) shall reach at the end of heating. In conjunction with the kind of food which has the lowest rate of timewise variation in the output of said gas sensor (7), a decision is made as to whether the timewise variation in the output signal of the gas sensor after reaching a given detection level (Vs,) is greater than a predetermined timewise variation, for deciding the subkind of the food, and a desired one of different constants (NK) for additional heating is selected according such second decision. Additional heating is effected for a length of time which is the product of the time necessary for the output signal from the gas sensor (7) to reach said intended final level and the desired constant for additional heating so selected.</p> |
