There is disclosed a vehicle air conditioner which can realize a desirable outlet temperature even when a refrigerant subcool degree of a radiator varies. A controller executes a heating mode to let a refrigerant discharged from a compressor 2 radiate heat in a radiator 4, decompress the refrigerant by which heat has been radiated, and then let the refrigerant absorb heat in an outdoor heat exchanger 7, thereby heating the vehicle interior. The controller controls the compressor 2 on the basis of a radiator target pressure, and corrects the radiator target pressure in such a direction as to heighten when a target subcool degree enlarges, on the basis of the target subcool degree (the refrigerant subcool degree) of the radiator 4.

A method for defogging a window of a vehicle includes steps of automatically selecting a climate control system operating mode and determining a risk of window fogging. The climate control system operating mode is selected from an outside air mode, an air-conditioning mode, and a defrost mode. A controller determines the risk of window fogging according to one or more inputs, and the same or a different controller may automatically select the climate control system operating mode. The controller is configured to increase a climate control system blower speed to increase a rate of airflow provided by the currently-actuated climate control system operating mode. The controller may sequentially advance the climate control system operating mode through the outside air mode, air-conditioning mode, and defrost mode.

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 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.

Methods and system for operating a vehicle climate control system are described. In one example, the vehicle climate control system includes high and low temperature coolant loops that operate in conjunction with a heat pump. The systems and methods may be incorporated into electric, hybrid, and internal combustion engine propelled vehicles.

Methods and system for operating a vehicle climate control system are described. In one example, the vehicle climate control system includes high and low temperature coolant loops that operate in conjunction with a heat pump. The systems and methods may be incorporated into electric, hybrid, and internal combustion engine propelled vehicles.

There is disclosed a vehicular air-conditioning device of a so-called heat pump system which eliminates or decreases noise generated when an opening/closing valve opens at a changing time of an operation mode. The vehicular air-conditioning device executes a heating mode to let a refrigerant discharged from a compressor 2 radiate heat in a radiator 4, decompress the refrigerant by which heat has been radiated, and then let the refrigerant absorb heat in an outdoor heat exchanger 7, and a dehumidifying and heating mode to open a solenoid valve 22 in a state of the heating mode, decompress at least a part of the refrigerant flowing out from the radiator and then let the refrigerant absorb heat in a heat absorber 9. When the heating mode changes to the dehumidifying and heating mode, the controller decreases a radiator pressure or a pressure difference before and after the solenoid valve to a predetermined value or less, and then opens the solenoid valve 22.

There is disclosed a vehicle air conditioner which is capable of enlarging an effective range of a dehumidifying and heating mode to environmental conditions and smoothly dehumidifying and heating a vehicle interior. A vehicle air conditioner 1 executes a dehumidifying and heating mode in which a controller lets a refrigerant discharged from a compressor 2 radiate heat in a radiator 4, and decompresses the refrigerant by which heat has been radiated and then lets the refrigerant absorb heat in a heat absorber 9 and an outdoor heat exchanger 7, the controller decreases an outdoor blower voltage FANVout of an outdoor blower 15 and decreases an air volume into the outdoor blower 15 in a case where a temperature Te of the heat absorber 9 is high even when the controller adjusts a valve position of an outdoor expansion valve 6 into a lower limit of controlling in a situation in which a temperature TCI of the radiator 4 is satisfactory.

An air conditioner for a vehicle includes a casing, a cooling heat exchanger, a cooling temperature adjusting portion, a dew-point detector, a target temperature determining portion, and a cooling temperature control portion. The cooling heat exchanger is arranged in the casing to cool air to be blown into a vehicle compartment. The cooling temperature adjusting portion adjusts a cooling temperature of air cooled at the cooling heat exchanger such that the cooling temperature approaches a target cooling temperature of the cooling heat exchanger. The dew-point detector detects a dew-point temperature of air flowing to the cooling heat exchanger. The target temperature determining portion determines the target cooling temperature to be a first target temperature lower than the dew-point temperature by a standard degree, and temporarily to be a second target temperature lower than the first target temperature.

An air cleaning system for a vehicle includes: an air purification button generating an operation signal for purifying air in an interior of the vehicle; an inside air purification unit blocking air outside of the vehicle from being introduced into the interior of the vehicle and filtering and circulating air inside of the vehicle, when the air purification button is operated; a fog detection unit detecting a humidity of a window of the vehicle by detecting moisture on the window; and a controller controlling an operation of the inside air purification unit when the air purification button is operated and determining whether a defogging unit of the vehicle for removing the moisture on the window is to be operated based on a signal from the fog detection unit.