Patent ID: 6601397
Filing Date: 2003-08-05
Classification: F04C,F25B,Y02B

Abstract:
A compressor control system comprising:a compressor that is selectively operable while energized in at least two states including a first state corresponding to a first capacity and a second state corresponding to a second capacity lower than said first capacity, said compressor operable to compress a gas between a suction pressure and a discharge pressure; a pressure sensor for sensing said suction pressure; and a controller including motor start logic and coupled to said pressure sensor for producing a variable duty cycle control signal in which said duty cycle control signal is a function of said suction pressure, said controller being coupled to said compressor for unloading said compressor when initially energized and causing said compressor to selectively alternate between said first and second states in response to said variable duty cycle control signal, thereby adjusting capacity of said compressor based upon said suction pressure.