Controller for reversible air conditioning and heat pump HVAC sy

Details Controller for reversible air conditioning and heat pump HVAC sy Controller for reversible air conditioning and heat pump HVAC sy

1998-11-12

2000-07-18

Wayner, William

Refrigeration

Automatic control

Refrigeration producer

622283, 622284, F25B 4104, F25B 100

Patent

active

060890347

ABSTRACT:
A control system for controlling a reversible HVAC system of a motor vehicle is disclosed. The HVAC system includes an electric compressor for circulating a refrigerant through a heat pump. The speed of the compressor is controlled by a compressor control signal having a variable duty cycle. Inside and outside heat exchangers transfer heat energy between an outside environment and a passenger compartment of the motor vehicle. A refrigerant flow switching device switches the direction of refrigerant flow towards the inside heat exchanger in a heating mode and towards the outside heat exchanger in a cooling mode. A pressure reducing assembly supplies pressure reduced refrigerant to the inside heat exchanger in the cooling mode and to the outside heat exchanger in the heating mode. The pressure reducing assembly includes an electronic expansion valve in which the flow rate is set by an EXV control signal having a variable duty cycle. A controller controls the duty cycle setting of the compressor control signal and the EXV control signal such that a desired quantity of heat is transferred between the outside environment and the passenger compartment.

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