Superheat control of air conditioning system incorporating fuel cooler

A system for controlling vapor lock in an engine fuel line comprising:

• (a) a first and a second endothermic heat exchanger serially connected, said first exchanger disposed for cooling a compartment and said second exchanger in heat exchange relationship with said fuel line;
• (b) an exothermic heat exchanger;
• (c) electrically operated expansion valve means;
• (d) refrigerant conduit means connecting said expansion valve means intermediate said exothermic heat exchanger and first endothermic heat exchanger:
• (e) compressor means operative upon energization to circulate refrigerant through said exothermic heat exchanger through said expansion valve means and through said first and second endothermic heat exchangers;
• (f) pressure sensing means disposed to sense the pressure of refrigerant flow between said first and second endothermic heat exchangers and provide an electrical signal indicative of said pressure;
• (g) temperature sensing means disposed in a conduit means between said second endothermic heat exchanger and said compressor means and operative to provide an electrical signal T.sub.A indicative of the temperature of refrigerant flow in said conduit means;
• (h) means to convert said sensed pressure to saturation temperature, Ts, for the refrigerant being circulated;
• and
• (i) comparator means operable to compare T.sub.A and T.sub.S and generate a control signal indicative of said comparison and means for operating said expansion valve means responsive to said control signal;
• and;
• (j) means operative to circulate engine fuel through said second endothermic heat exchanger for heat exchange with said refrigerant.