Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor
AssigneeCopeland Corporation
InventorsHung M. Pham, Abtar Singh, Jean-Luc M. Caillat, Mark Bass
Life of this patent
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Abstract
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.
Claims10
A compressor control system comprising:
- a scroll compressor for compressing a gas from a suction pressure to a discharge pressure, said compressor including intermeshing scroll wraps defining moving fluid pockets, said scroll wraps being movable relative to one another to develop pressure and compress said gas;
- a pressure sensor for sensing said suction pressure;
- a control mechanism operably engaging said intermeshing scroll wraps to develop pressure while maintaining substantially constant relative movement of said scroll wraps;
- and
- a controller operating said control mechanism and responsive to said pressure sensor for providing a variable duty cycle control signal for modulating an operating capacity of said scroll compressor based upon said suction pressure.
A control system comprising:
- a first housing;
- a first evaporator disposed in said housing;
- a condenser coupled in fluid communication with said first evaporator;
- a compressor coupled in fluid communication with said first evaporator and said condenser, said compressor being operable to compress a gas from a suction pressure to a discharge pressure, said compressor comprising a pulse width modulated variable capacity scroll compressor having intermeshing scroll wraps defining moving pockets, said scroll wraps being movable relative to one another to develop pressure and compress said gas;
- a pressure sensor for sensing said suction pressure;
- and
- a control mechanism operably engaging said intermeshing scroll wraps to develop said pressure, while maintaining substantially constant relative movement of said scroll wraps;
- and
- a controller operating said control mechanism and responsive to said pressure sensor for providing a variable duty cycle control signal for modulating an operating capacity of said scroll compressor based upon said suction pressure.
Dependencies are inferred from the claim text.