A low charge protection method for an electronically controlled variable displacement compressor. In each period of compressor operation, a low charge test sequence is carried out to monitor the system performance once the system control pressure has been reduced below a specified level. In a set-up...http://www.google.ca/patents/US5009074?utm_source=gb-gplus-sharePatent US5009074 - Low refrigerant charge protection method for a variable displacement compressor
