Refrigeration – Automatic control – Refrigeration producer
Patent
1992-10-09
1994-03-22
Tanner, Harry B.
Refrigeration
Automatic control
Refrigeration producer
622283, 622284, G05D 2319
Patent
active
052953637
ABSTRACT:
A method and apparatus of controlling an air conditioner. The discharge temperature of a compressor and the indoor heat exchanger temperature are steadily controlled to set temperatures as close as possible, suppressing hunting of the frequency of an inverter. A temperature sensor is provided for detecting the temperature of the indoor heat exchanger or the discharge temperature of the compressor. A control unit is further provided, and judges as to in which temperature zone among at least preset four temperature zones the detected temperature is. Then, the control unit outputs frequency control signals to the inverter to perform the following operations: when the detected temperature is in the lowest temperature zone, the output frequency of the inverter is increased at a predetermined speed; in a lower intermediate temperature zone the frequency is slowly increased; in an upper intermediate temperature zone below a set temperature the current frequency is maintained; and in a temperature zone above the set temperature the frequency is decreased at a predetermined speed.
REFERENCES:
patent: 4798057 (1989-01-01), Okamoto et al.
patent: 5040379 (1991-08-01), Fukunaga et al.
patent: 5054294 (1991-10-01), Dudley
Nagasawa Atsushi
Oomura Naoki
Kabushiki Kaisha Toshiba
Tanner Harry B.
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