Refrigeration – With indicator or tester – Operatively correlated with automatic control
Patent
1988-03-08
1989-06-27
Tanner, Harry B.
Refrigeration
With indicator or tester
Operatively correlated with automatic control
62127, 340585, F25B 4900
Patent
active
048417351
ABSTRACT:
A temperature controller and method of controlling a refrigerating device includes a temperature sensor for detecting temperature, a conversion circuit, a refrigerating cycle driving circuit, a comparison circuit, a failure decision circuit, and a memory circuit. The conversion circuit converts the temperature detected by the temperature sensor into a voltage value. The refrigerating cycle driving circuit operates a refrigerating cycle to cool a compartment in accordance with the voltage value. The comparison circuit compares the voltage value with a reference voltage range. The reference voltage range is changed by the failure decision circuit to two different states. The reference voltage range in the first state includes an ordinary voltage range corresponding to an ordinary operating temperature range of the refrigerating device. The reference voltage range in the second state includes the first state reference voltage range. When the voltage value is outside the reference voltage range in the second state, it is decided that a failure has occurred in the temperature sensor. When the voltage value is outside the reference voltage range in the first state but inside the second state reference voltage range, it is decided that a failure has occurred in the refrigerating cycle or the refrigerating cycle driving circuit. The failures of the refrigerating device are memorized in the memory circuit.
REFERENCES:
patent: 4313308 (1982-02-01), Boratgis et al.
patent: 4381549 (1983-04-01), Stamp, Jr. et al.
patent: 4387578 (1983-06-01), Paddock
patent: 4432210 (1984-02-01), Saito
patent: 4441329 (1984-04-01), Dawley
Kabushiki Kaisha Toshiba
Tanner Harry B.
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