Electric heating – Microwave heating – With control system
Patent
1993-10-25
1996-09-24
Leung, Philip H.
Electric heating
Microwave heating
With control system
219707, 219710, 99325, H05B 668
Patent
active
055587976
ABSTRACT:
A heating apparatus such as microwave ovens includes a heating chamber having a door, heaters for heating food contained in the heating chamber, a temperature sensor for sensing a temperature in the heating chamber to provide an output in accordance with the sensed temperature, a gas sensor sensing a volume of gas in the heating chamber to provide an output in accordance with the sensed gas volume, and a microcomputer-based control device. The control device sets a reference value in accordance with the output of the temperature sensor, the reference value being for determining the kind of the food. The control device further calculates a change rate of the gas volume on the basis of the output of the gas sensor. The control device then compares the change rate of the gas volume with the reference value to determine the kind of the food contained in the heating chamber.
REFERENCES:
patent: 4324966 (1982-04-01), Tanabe
patent: 4376131 (1983-03-01), Mori et al.
patent: 4379964 (1983-04-01), Kanazawa et al.
patent: 4463238 (1984-07-01), Tanabe
patent: 4481394 (1984-11-01), Tanabe
patent: 4484065 (1984-11-01), Ueda
patent: 4692597 (1987-09-01), Tsuda et al.
patent: 4874928 (1989-10-01), Kasai
Kabushiki Kaisha Toshiba
Leung Philip H.
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