Hybrid compressor control method

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;
• reading a low pressure transducer;
• determining whether the displacement of the hybrid compressor is sufficient based on the low pressure transducer reading;
• and
• changing the displacement of the compressor if the displacement is insufficient.

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;
• reading an evaporator core thermister;
• determining whether the displacement of the hybrid compressor is sufficient based on the evaporator core thermister reading;
• and
• changing the displacement of the compressor if the displacement is insufficient.

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;
• reading an evaporator core thermister;
• reading a low pressure transducer;
• determining whether the displacement of the hybrid compressor is sufficient based on the evaporator core thermister reading and the low pressure transducer reading;
• and
• changing the displacement of the compressor if the displacement is insufficient.