Refrigeration – Automatic control – Time or program actuator
Patent
1989-03-30
1990-01-23
Wayner, William E.
Refrigeration
Automatic control
Time or program actuator
62161, 62227, 622285, F25B 100
Patent
active
048949990
ABSTRACT:
An automatic air conditioning system for automotive vehicles with a variable displacement compressor comprises a sensor for detecting an intake air temperature of air flowing through the evaporator placed just behind the evaporator, a control valve for the compressor essentially changing the discharge of said compressor on the basis of the difference between the intake air temperature and its target value, and a CPU for changing the target value of the intake air temperature. When the CPU does not receive a signal indicative of a requirement for quick-cooling, the target value is set to a freezing start possible temperature defined by an intake air temperature such that the freezing of the evaporator starts, and when the CPU receives the signal indicative of a requirement for quick-cooling, the target value is set to a predetermined temperature lower than the freezing start possible temperature. Thus, the automatic air conditioning system is capable of maintaining a high displacement of refrigerant in spite of the lowering of suction pressure of the compressor, related to the dropping of the intake air temperature, when the quick-cooling is required.
REFERENCES:
patent: 4748819 (1988-06-01), Takahashi
patent: 4815300 (1989-03-01), Suzuh
Kaiju Masaki
Kiminami Ikuo
Nose Toshimitsu
Sakamoto Hideyuki
Nissan Motor Company Limited
Wayner William E.
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