Delphi Technologies Inc.

Delphi Protection Systems for Low Refrigerant Charge allow early detection of low refrigerant charge help ensure refrigerant integrity, prevent loss of air conditioning performance and help avoid costly compressor repairs. These various low refrigerant detection methods have been developed for conventional and heat pump air conditioning systems. Pressure is measured by a sensor connected in the suction or discharge line. If the time to meet a pressure criterion exceeds a predetermined value, a low charge is indicated.

Early detection of low refrigerant charge helps ensure refrigerant integrity, prevent loss of air conditioning performance, and helps avoid costly compressor repairs. These various low refrigerant detection methods have been developed for conventional and heat pump air conditioning systems.

Specific Technologies

Low Refrigerant Detection System for a Heat Pump – A sensor connected in the suction or discharge line measures pressure. A low charge is indicated if the time to meet a pressure criterion exceeds a predetermined value.

Low Refrigerant Charge Protection Method for an Electronically Controlled Variable Displacement Compressor – A low charge test sequence is carried out to monitor the system performance during compressor operation. A failure is indicated if the system pressure is reduced to a specified amount within a predetermined interval.

Microprocessor-based Low Refrigerant Charge Protection Method – The control receives inputs from sensors that measure gas pressure and air temperatures to, and provide outputs for, the compressor clutch control.

Non-invasive Low Charge Detection Method Utilizing Temperature Sensors – This is a low-cost system in which thermistor-based temperatures are compared to thresholds. The compressor turns off if the temperature is exceeded.

Potential Applications

Classification

Automotive Components: Miscellaneous

Inventors

Tomasov; Glenn E. ; Pettitt; Edward D. ; Scoccia; Ardeean ; Runk; Robert M.

Contact Information

Tim Forbes
[1] 248.813.8065
timothy.forbes@delphi.com