Patent ID: 6715995
Filing Date: 2004-04-06
Classification: B60H,F04B,F25B

Abstract:
A method for controlling a hybrid compressor system, wherein the hybrid compressor system has a variable displacement hybrid compressor that is selectively driven by one of an engine and an electric motor to cool a passenger compartment of a vehicle, the method comprising:transmitting a demand signal to activate an electric motor drive mode of the hybrid compressor system, whereby the electric motor drives the hybrid compressor; transmitting a compressor displacement signal to the hybrid compressor to set a displacement of the compressor to a minimum level; waiting a predefined time period; activating the electric motor to drive the compressor; determining a suction pressure of a suction chamber of the hybrid compressor; determining whether the displacement of the hybrid compressor is sufficient based on the suction pressure determination; and changing the displacement of the compressor if the displacement is insufficient.