Air conditioning apparatus
AssigneeNippondenso Co., Ltd.
InventorsSatoshi Itoh, Kunio Iritani
Life of this patent
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Abstract
When a defroster switch is input in a heating operation mode, an opening degree of an electric type of a heating expansion valve is controlled to be smaller when temperature of refrigerant discharged from a compressor is less than a predetermined temperature. Therefore, the supercooling degree of the liquid refrigerant of an indoor heating heat exchanger becomes large, the temperature of the heat exchanger becomes high, so that the temperature of air which is blown from a defroster outlet becomes high. Thus, the defrosting effect of a front windshield glass can be increased. Accordingly, when the defrosting of the front windshield is needed, the defrosting effect is increased as compared with when the defrosting is not needed.
Claims15
An air conditioning apparatus comprising:
- air blowing means for generating air flow;
- a casing having an air passage therein, said air passage at least having a defroster air outlet at one end for blowing air generated by said air blowing means toward an inside surface of a windshield;
- a refrigerating cycle having a compressor for compressing a refrigerant, a condenser for condensing the refrigerant from said compressor to heat air in said air passage by heat of condensation thereof, an electric expansion valve for decompressing the refrigerant from said condenser and an evaporator for evaporating the refrigerant from said electric expansion valve;
- defrosting instruction signal generating means for generating a defrosting instruction signal which instructs a defrosting of said windshield;
- defroster air outlet opening/closing means for opening and closing said defroster air outlet, said defroster outlet opening/closing means open said defroster air outlet to perform a defrosting of said windshield when said defrosting instruction signal generating means generates a defrosting instruction signal;
- defrosting instruction signal determining means for determining whether said defrosting instruction signals generating means generates said defrosting instruction signal;
- first expansion valve control means in which an opening degree of said electric expansion valve becomes a first opening degree when said defrosting instruction signal determining means determines that said defrosting instruction signal is not generated;
- and
- second expansion valve control means in which an opening degree of said electric expansion valve becomes an second opening degree which is smaller than said first opening degree when said defrosting instruction signal determining means determines that said defrosting instruction signal is generated.
An air conditioning apparatus comprising:
- air blowing means for generating air flow;
- a casing having an air passage therein, said air passage having at least a defroster air outlet at one end for blowing air generated by said air blowing means toward an inside surface of a windshield;
- a refrigerating cycle having a compressor for compressing a refrigerant, a condenser for condensing the refrigerant from said compressor to heat air in said air passage by heat of condensation thereof, an electric expansion valve for decompressing the refrigerant from said condenser and an evaporator for evaporating the refrigerant from said electric expansion valve;
- defrosting instruction signal generating means for generating a defrosting instruction signal which instructs a defrosting of said windshield;
- defroster air outlet opening/closing means for opening and closing said defroster air outlet, said defroster outlet opening/closing means open said defroster air outlet to perform a defrosting of said windshield when a defrosting instruction signal is generated;
- and
- control means for controlling an opening degree of said electric expansion valve to a first opening degree when a defrosting instruction signal is generated and for controlling said opening degree of said electric expansion valve to a second opening degree which is smaller than said first opening degree when a defrosting instruction signal generating means is not generated.
Dependencies are inferred from the claim text.