Refrigerator electronic temperature control and malfunction sign

Details Refrigerator electronic temperature control and malfunction sign Refrigerator electronic temperature control and malfunction sign

1978-02-01

1980-02-05

Wayner, William E.

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62229, 62323, 62324, F25B 4900

Patent

active

041870930

ABSTRACT:
Electronic control apparatus is disclosed for automatically controlling the operation of refrigeration units on truck-drawn trailers and providing a signal to the truck driver in the event there is a malfunction in the refrigeration unit that could result in damage to the cargo. An electronic automatic temperature control circuit includes solid state comparators which are responsive to a temperature sensor and to a temperature selector. The comparators provide output signals that selectively actuate solid state control elements which in turn control the actuation of the various load devices in the refrigeration unit to maintain the temperature in the refrigerated chamber within a selected temperature range. When the temperature in the refrigerated chamber is above a selected temperature setting to the extent that damage to the cargo might be caused, a solid state malfunction circuit controls the actuation of a solid state relay and in turn a malfunction indicator. A solid state defrost cycle control circuit is responsive to a defrost cycle sensor indicating defrosting is taking place, which overrides the actuation of the malfunction circuit for a few minutes during each multiple-hour time interval and, if the defrost cycle sensor fails, the defrost cycle control circuit is arranged to insure that the defrosting operation is still carried out.

REFERENCES:
patent: 3730819 (1973-05-01), Evalds
patent: 4034570 (1977-07-01), Anderson et al.

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