CONTROL DEVICE FOR VARIABLE DISPLACEMENT COMPRESSOR

摘要

PROBLEM TO BE SOLVED: To provide a control device preventing a sliding part inside a variable displacement compressor from being poorly lubricated when the device is operated in a high discharge pressure. SOLUTION: A control computer 70 disregards a cooling load and outputs a command to a control valve CV to minimize a discharge capacity of the compressor when the discharge pressure Pd reaches a predetermined value or higher. When the discharge capacity of the compressor comes to a minimum, a refrigerant circulation via an outside refrigerant circuit is stopped and an internal refrigerant circulation via a discharge chamber 22, a crankcase 5, an intake chamber 21 and a compressing chamber 29 is performed for circulating the refrigerant as well as lubricant.