Air conditioner for vehicle, improved for frost deposition

An air conditioner for a vehicle having a passenger compartment, comprising:

• an air duct for forming an air passage in which an outside air inlet is formed at one end thereof and an air outlet communicating with said passenger compartment is formed at the other end;
• blowing means for blowing an air flow from said outside air inlet toward said air outlet;
• and
• a refrigeration cycle including a compressor for compressing a refrigerant, an indoor heat exchanger provided in said air passage, pressure reducing means for reducing a pressure of said refrigerant, and an outdoor heat exchanger provided outside said passenger compartment, said indoor heat exchanger and said outdoor heat exchanger functioning as a condenser and an evaporator in a heating operation, respectively;
• frost deposition conditions determining means for determining for determining whether or not conditions that frost may be deposited on said outdoor heat exchanger have been satisfied in said heating operation;
• and
• control means for controlling an amount of ventilating air which is sucked from said outside air inlet and blown out into said passenger compartment through said air outlet by said blowing means, when said conditions have been determined by said frost deposition conditions determining means, in such a manner that said control means reduces said amount of ventilating air for at least a predetermined period from an amount of ventilating air before said conditions have been determined by said frost deposition conditions determining means while keeping said indoor heat exchanger and said outdoor heat exchanger functioning as said evaporator and said condenser, respectively.

An air conditioner for a vehicle having a passenger compartment, comprising:

• an air duct for forming an air passage in which an air inlet is formed at one end thereof and an air outlet communicating with said passenger compartment is formed at the other end;
• blowing means for blowing an air flow from said air inlet toward said air outlet;
• and
• a refrigeration cycle including a compressor for compressing a refrigerant, an indoor heat exchanger provided in said air passage, pressure reducing means for reducing a pressure of said refrigerant, and an outdoor heat exchanger provided outside said passenger compartment, said indoor heat exchanger and said outdoor heat exchanger functioning as a condenser and an evaporator in a heating operation, respectively;
• frost deposition determining means for determining whether or not a predetermined amount of frost has been deposited on said outdoor heat exchanger in said heating operation;
• and
• control means for controlling a radiated heat amount in said indoor heat exchanger, when said frost deposition determining means determines that said predetermined amount of frost has been deposited on said outdoor heat exchanger, in such a manner that said control means reduces said radiated heat amount for at least a predetermined period from a radiated heat amount in said indoor heat exchanger before said predetermined amount of frost deposition has been determined by said frost deposition determining means while keeping said indoor heat exchanger and said outdoor heat exchanger functioning as said evaporator and said condenser, respectively.

An air conditioner for a vehicle having a passenger compartment, comprising:

• an air duct for forming an air passage in which an air inlet is formed at one end thereof and an air outlet communicating with said passenger compartment is formed at the other end;
• blowing means for blowing an air flow from said air inlet toward said air outlet;
• and
• a refrigeration cycle including a compressor for compressing a refrigerant, an indoor heat exchanger provided in said air passage, pressure reducing means for reducing a pressure of said refrigerant, and an outdoor heat exchanger provided outside said passenger compartment, said indoor heat exchanger and said outdoor heat exchanger functioning as a condenser and an evaporator in a heating operation, respectively;
• frost deposition conditions determining means for determining for determining whether or not conditions that frost may be deposited on said outdoor heat exchanger have been satisfied in said heating operation;
• and
• control means for controlling a radiated heat amount in said indoor heat exchanger when said conditions have been determined by said frost deposition conditions determining means in such a manner that said control means reduces said radiated heat amount in said indoor heat exchanger for at least a predetermined period from a radiated heat amount before said conditions have been determined by said frost deposition conditions determining means while keeping said indoor heat exchanger and said outdoor heat exchanger functioning as said evaporator and said condenser, respectively.

An air conditioner for a vehicle having a passenger compartment, comprising:

• an air duct for forming an air passage in which an air inlet is formed at one end thereof and an air outlet communicating with said passenger compartment is formed at the other end;
• blowing means for blowing an air flow from said air inlet toward said air outlet;
• and
• a refrigeration cycle including a compressor for compressing a refrigerant, an indoor heat exchanger provided in said air passage, pressure reducing means for reducing a pressure of said refrigerant, and an outdoor heat exchanger provided outside said passenger compartment, said indoor heat exchanger and said outdoor heat exchanger functioning as a condenser and an evaporator in a heating operation, respectively;
• frost deposition determining means for determining whether or not a predetermined amount of frost has been or may be deposited on said outdoor heat exchanger in said heating operation;
• and
• control means for reducing for at least a predetermined period an amount of ventilating air which is sucked from said air inlet and blown out into said passenger compartment through said air outlet by said blowing means when said frost deposition determining means determines that said predetermined amount of frost has been or may be deposited on said outdoor heat exchanger while keeping said heating operation.