초록 ▼

A control for a refrigeration system serviced by a special pulse width modulated compressor coupled to a condenser and evaporator. The system can be of the distributed type wherein the condenser and compressor may be coupled to service a group of adjacent refrigeration cases, wherein each case would

A control for a refrigeration system serviced by a special pulse width modulated compressor coupled to a condenser and evaporator. The system can be of the distributed type wherein the condenser and compressor may be coupled to service a group of adjacent refrigeration cases, wherein each case would have its own evaporator. A controller is coupled to a load sensor for producing a variable duty cycle control signal in which the duty cycle is a function of demand for cooling. Moreover, fuzzy logic techniques may be utilized in order to provide self adaptive tuning control for the system.

대표청구항 ▼

[ We claim:] [1.] A compressor control system, comprising:a compressor that is selectively operable while energized in at least two states, said compressor comprising a pair of fluid compressing members and including a first state corresponding to a first capacity wherein said pair of fluid compress

[ We claim:] [1.] A compressor control system, comprising:a compressor that is selectively operable while energized in at least two states, said compressor comprising a pair of fluid compressing members and including a first state corresponding to a first capacity wherein said pair of fluid compressing members are separated by a seal and a second state corresponding to a second capacity lower than said first capacity wherein said seal between said pair of fluid compressing members is broken;a load sensor for sensing a property indicative of demand for cooling;a controller coupled to said load sensor for producing a variable duty cycle control signal in which the duty cycle is a function of demand for cooling;said controller being coupled to said compressor for causing said compressor to selectively alternate between said first and second states in response to said variable duty cycle control signal, thereby adjusting the capacity of said compressor to the demand for cooling while said compressor is energized.