Method for controlling vehicle HVAC system
AssigneesHyundai Motor Company, Kia Corporation
InventorKi Hyun Kim
Life of this patent
Estimating the term…
Abstract
An embodiment method for controlling a heating, ventilation, and air conditioning (HVAC) system of a vehicle includes determining a target subcooled temperature of a refrigerant based on a temperature and a pressure of the refrigerant discharged from an outlet of a compressor when the compressor operates, calculating a change in enthalpy of the refrigerant based on the determined target subcooled temperature in a process of condensing and subcooling the refrigerant, calculating a change in enthalpy of air passing over an exterior surface of a condenser based on the calculated refrigerant enthalpy change, and calculating a required fan duty of a cooling fan based on the calculated air enthalpy change, wherein the cooling fan is configured to blow the air to the condenser.
Claims20
A method for controlling a heating, ventilation, and air conditioning (HVAC) system of a vehicle, the method comprising:
- determining a target subcooled temperature of a refrigerant based on a temperature and a pressure of the refrigerant discharged from an outlet of a compressor when the compressor operates;
- calculating a change in enthalpy of the refrigerant based on the determined target subcooled temperature in a process of condensing and subcooling the refrigerant;
- calculating a change in enthalpy of air passing over an exterior surface of a condenser based on the calculated refrigerant enthalpy change;
- and
- calculating a required fan duty of a cooling fan based on the calculated air enthalpy change, wherein the cooling fan is configured to blow the air to the condenser.
A method for controlling a heating, ventilation, and air conditioning (HVAC) system for a vehicle, the method comprising:
- determining whether a compressor operates, a refrigerant passes through an exterior heat exchanger, and a heating-side expansion valve is fully opened;
- in response to a determination that the compressor operates, the refrigerant passes through the exterior heat exchanger, and the heating-side expansion valve is fully opened, determining a target subcooled temperature of the refrigerant based on a temperature and a pressure of the refrigerant discharged from an outlet of the compressor;
- calculating a change in enthalpy of the refrigerant based on the determined target subcooled temperature;
- calculating a change in enthalpy of air passing over an exterior surface of a condenser based on the calculated refrigerant enthalpy change;
- calculating a required fan duty of a cooling fan based on the calculated air enthalpy change;
- and
- operating the cooling fan to blow the air to the condenser based on the calculated fan duty.
A heating, ventilation, and air conditioning (HVAC) system for a vehicle, the HVAC system comprising:
- a compressor;
- a condenser coupled to the compressor;
- a cooling fan configured to blow air to the condenser;
- and
- a controller configured to:
- determine a target subcooled temperature of a refrigerant based on a temperature and a pressure of the refrigerant discharged from an outlet of the compressor;
- calculate a change in enthalpy of the refrigerant based on the determined target subcooled temperature in a process of condensing and subcooling the refrigerant;
- calculate a change in enthalpy of air passing over an exterior surface of the condenser based on the calculated refrigerant enthalpy change;
- and
- calculate a required fan duty of the cooling fan based on the calculated air enthalpy change.
Dependencies are inferred from the claim text.