A vehicle air conditioning apparatus is provided that can prevent temperature variations of the air after the heat exchange in a radiator to reliably control the temperature of the air supplied to the vehicle interior. During the heating operation and the heating and dehumidifying operation, target degree of supercooling SCt when target air-blowing temperature TAO is a predetermined temperature or higher is set to SCt1 that is greater than SCt2 when the target air-blowing temperature TAO is lower than the predetermined temperature. When amount of air Ga supplied from indoor fan 12 is lower than a predetermined value, the target degree of supercooling SCt is corrected, which is set such that the degree of supercooling is lower than target degree of supercooling corrected when the amount of air Ga supplied from the indoor fan 12 is a predetermined value or higher.

A method for controlling an air flow for a vehicle may include mode selecting, that includes an input portion receiving an input for selecting at least any one of a plurality of discharging modes provided so as to select a discharge pattern of air discharged to the inside of the vehicle and an air flow controller determining the discharge mode, and air volume selecting, that includes the input portion receiving an input for selecting an air volume in the determined discharging mode after the discharging mode is determined and the air flow controller determining the air volume.

A vehicle air conditioning apparatus is provided that can prevent temperature variations of the air after the heat exchange in a radiator to reliably control the temperature of the air supplied to the vehicle interior. During the heating operation and the heating and dehumidifying operation, target degree of supercooling SCt when target air-blowing temperature TAO is a predetermined temperature or higher is set to SCt1 that is greater than SCt2 when the target air-blowing temperature TAO is lower than the predetermined temperature. When amount of air Ga supplied from indoor fan 12 is lower than a predetermined value, the target degree of supercooling SCt is corrected, which is set such that the degree of supercooling is lower than target degree of supercooling corrected when the amount of air Ga supplied from the indoor fan 12 is a predetermined value or higher.

An air conditioning system for motor vehicles includes an air conditioner case having a left path, a right path and a rear seat path. A temperature door is configured to adjust a volume of a cold air or a hot air. A main blower is configured to blow the cold air or the hot air and an air volume distribution door is configured to control opening degrees of the left path and the right path. A rear seat auxiliary blower is configured to increase a volume and a pressure of the cold air or the hot air flowing through the rear seat path. A control unit is configured to, when an air volume distribution ratio of the main blower is changed, correct an opening position of the air volume distribution door and compensate a change in an air volume distribution ratio of the left path and the right path.

An apparatus for improving vehicle internal air may include an air conditioner including an intake door for controlling introduction of external air into a vehicle; an electric dust collection filter to collect fine dust contained in air; and a control device to control operation of the electric dust collection filter and the intake door, based on information about a concentration of fine dust inside the vehicle, a concentration of fine dust outside the vehicle, and a vehicle speed.

A system and method for controlling a transport heating, ventilation, and air conditioning (HVAC) system having a fresh air intake is disclosed. The fresh airflow intake system includes a fresh air damper configured to regulate a flow of fresh air into the transport HVAC system, an evaporator fan having at least a high-speed mode and a low speed mode, and a controller. The controller is configured to determine whether a fresh air condition is met and increase a fresh airflow in response to determining the fresh air condition is met. The controller is further configured to increase an evaporator fan speed when the fresh airflow is increased.

In a method for controlling a heating, ventilation and air conditioning system of a vehicle, a total air flow is generated by means of a fan. The total air flow is divided into partial air flows which are conducted via outlet openings into several selected zones of a vehicle cab of the vehicle. Furthermore, a predefined proportion of the total air flow is set as a partial air flow, wherein the predefined proportion is established using a manually operated, central control device of the heating, ventilation and air conditioning system. A corresponding heating, ventilation and air conditioning system for a vehicle is also described.

Disclosed are climate systems and methods for control the climate systems. A climate system includes a plurality of compressors arranged in parallel, a condenser disposed downstream of the compressors and an evaporator disposed downstream of the condenser. The compressors, the condenser, and the evaporator are fluidly connected by refrigerant lines to form a refrigerant circuit. The climate system also includes a controller that controls the operation of the compressors to draw back lubricant to the compressors without use of an oil equalization system.

A method for operating an air-conditioning apparatus of a vehicle wherein the air-conditioning apparatus has at least three display modes including a status mode, a transition mode, and a setting mode. A current value of a setting parameter of the air-conditioning apparatus and whether an operating intention of a user exists are detected. If no operating intention is detected, the status mode is activated. If an operating intention is detected, the transition mode or the setting mode is activated. Depending on the activated display mode, graphical data of a graphical representation of an interior of the vehicle is generated and displayed so the status mode is activated. The representation of the interior includes a display element for outputting the currently set value of the setting parameter.

An air conditioning system for motor vehicles is designed to independently cool or heat a plurality of vehicle room regions and to independently adjust discharged air volume levels in the respective vehicle room regions. The air conditioning system includes a control unit configured to, when one of the discharged air volume levels in the respective vehicle room regions is set to a maximum air volume level, dependently control the other discharged air volume level to the maximum air volume level while entering into a maximum air volume control mode.