Microwave oven with automatic cooking performance having additio

Details Microwave oven with automatic cooking performance having additio Microwave oven with automatic cooking performance having additio

1982-09-01

1984-12-11

Albritton, C. L.

Electric heating

Metal heating

Of cylinders

219 1055E, 219 1055M, 99325, H05B 906

Patent

active

044880260

ABSTRACT:
In an automated microwave oven, a gas sensor is provided within a passageway for air leaving the heating chamber. In addition to a switching circuit for controlling an enabling circuit for a microwave source such as a magnetron, a cook switch is provided which is common to all of the different kinds of food to be heated. A microcomputer is provided which generates a heating stop instruction for the enabling circuit of the microwave source in response to both an output signal from the gas sensor and a stored program in the microcomputer. Based upon the rate of timewise variation in the output signal from the gas sensor, the microcomputer decides roughly what kind of food is being heated and then establishes an intended final level which the gas sensor should 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 the gas sensor, decision is made as to whether the timewise variation in the output signal of the gas sensor after reaching a given detection level (V.sub.S1) is greater than a predetermined timewise variation, for deciding the subkind of the food and a desired constants (N.sub.K) for additional heating according to 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 to reach the intended final level and the desired constant for additional heating so selected.

REFERENCES:
patent: 4162381 (1979-07-01), Buck
patent: 4350860 (1982-09-01), Ueda
patent: 4379964 (1983-04-01), Kanazawa et al.

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