Patent ID: 8682526
Filing Date: 2014-03-25
Classification: B60H

Abstract:
1. An automotive air-conditioning system configured to implement a sub-critical refrigerating cycle and comprising a condenser and a fan associated thereto, a compressor, an evaporator, an expansion valve, and an electronic control system; wherein the expansion valve is non-electronically controlled, with the electronic control system configured to: receive a signal indicating an external ambient temperature (T receive a signal indicating a measured condensation pressure (P determine a target condensation pressure (P generate a condenser fan control signal (Sc) based on the measured condensation pressure(Pmeans_fluid) and the target condensation pressure (Ptarget_fluid) of the coolant in the condenser; determine a pressure error (ep) indicative of a difference between the measured condensation pressure (Pmeas˜fluid) and the target condensation pressure (Ptarget_fluid) of the coolant in the condenser; and generate the condenser fan control signal (Sc) based on the pressure error (ep).