Compressor control system

Abstract

The compressor assembly includes a compressor and a controller mounted on the compressor and operable to monitor operational characteristics of the compressor. The controller also controls the compressor unloader, liquid injection, oil injection and/or a crankcase heater.

What is claimed is:  
     
         1 . A compressor assembly comprising: 
 a compressor;    a compressor unloader operable to control compressor capacity; and    a controller mounted on said compressor and operable to monitor operational characteristics of said compressor and control said compressor unloader.    
     
     
         2 . The compressor assembly of  claim 1 , wherein said compressor unloader includes a solenoid control system, wherein said controller unloads compressor capacity by operating said solenoid control system.  
     
     
         3 . The compressor assembly of  claim 1 , further comprising a liquid injection system for injecting liquid into said compressor, said controller operable to control said liquid injection system.  
     
     
         4 . The compressor assembly of  claim 1 , further comprising an oil injection system operable to control oil injection to said compressor, said controller operable to control said oil injection system.  
     
     
         5 . The compressor assembly of  claim 1 , further comprising a crankcase heater disposed in said compressor and a heater control system operable to control said crankcase heater, said controller operable to control said heater control system.  
     
     
         6 . A compressor assembly comprising: 
 a compressor;    a liquid injection system operable to inject liquid into said compressor; and    a controller mounted on said compressor and operable to monitor operational characteristics of said compressor and control said liquid injection system.    
     
     
         7 . The compressor assembly of  claim 6 , further comprising a solenoid control system, wherein said controller controls said solenoid control system to operate said liquid injection system.  
     
     
         8 . The compressor assembly of  claim 6 , further comprising a compressor unloader operable to unload compressor capacity, wherein said controller controls said compressor unloader.  
     
     
         9 . The compressor assembly of  claim 6 , further comprising an oil injection system operable to control oil injection to said compressor, said controller operable to control said oil injection system.  
     
     
         10 . The compressor assembly of  claim 6 , further comprising a crankcase heater disposed in said compressor and a heater control system operable to control said crankcase heater, said controller operable to control said heater control system.  
     
     
         11 . A compressor assembly comprising: 
 a compressor;    an oil injection system operable to control oil injection to said compressor; and    a controller mounted on said compressor and operable to monitor operational characteristics of said compressor and control said oil injection system.    
     
     
         12 . The compressor assembly of  claim 11 , further comprising a solenoid control system associated with said oil injection system, wherein said controller controls said solenoid control system to operate said oil injection system.  
     
     
         13 . The compressor assembly of  claim 11 , further comprising a compressor unloader operable to unload compressor capacity, wherein said controller controls said compressor unloader.  
     
     
         14 . The compressor assembly of  claim 11 , further comprising a liquid injection system for injecting liquid into said compressor, said controller operable to control said liquid injection system.  
     
     
         15 . The compressor assembly of  claim 11 , further comprising a crankcase heater disposed in said compressor and a heater control system operable to control said crankcase heater, said controller operable to control said heater control system.  
     
     
         16 . A compressor assembly comprising: 
 a compressor;    a crankcase heater disposed in said compressor;    a heater control system operable to control said crank case heater; and    a controller mounted on said compressor and operable to monitor operational characteristics of said compressor and control said heater control system.    
     
     
         17 . The compressor assembly of  claim 16 , further comprising a liquid injection system for injecting liquid into said compressor, said controller operable to control said liquid injection system.  
     
     
         18 . The compressor assembly of  claim 16 , further comprising an oil injection system operable to control oil injection to said compressor, said controller operable to control said oil injection system.  
     
     
         19 . The compressor assembly of  claim 16 , further comprising a compressor unloader operable to unload compressor capacity, wherein said controller controls said compressor unloader.