Patent ID: 7296621

Claim:
A vehicular air conditioner comprising: heating means for heating air; cooling means for cooling air; window glass compartment interior surface temperature acquiring means for acquiring a window glass compartment interior surface temperature Tg; window glass dew-point compartment interior absolute humidity acquiring means for acquiring a window glass dew-point compartment interior absolute humidity Xrmax with said window glass compartment interior surface temperature Tg serving as a dew point; temporary compartment interior set absolute humidity acquiring means for acquiring a temporary compartment interior set absolute humidity (temporary Xset) with respect to a temporary compartment interior allowable upper limit relative humidity at a compartment interior set temperature Tset; compartment interior set absolute humidity setting means for setting a compartment interior set absolute humidity Xset such that if Xrmax>temporary Xset, Xset=temporary Xset, and if Xrmax≦temporary Xset, Xset=Xrmax; compartment interior absolute humidity acquiring means for acquiring a compartment interior absolute humidity Xr; outlet air required temperature calculating means for calculating an outlet air required temperature Tao required required to obtain said compartment interior set temperature Tset according to: Tao=Kt set· T set− Ktr·Tr−Ktam·Tam−Kts·Ts−Ct where Ktset is a compartment interior set temperature coefficient; Ktr is a compartment interior temperature sensor coefficient; Ktam is an exterior air temperature sensor coefficient; Kts is a solar radiation sensor coefficient; Ct is a temperature calculating coefficient; Tr is a compartment interior temperature; Tam is an exterior air temperature; and Ts is an amount of solar radiation; outlet air required absolute humidity calculating means for calculating an outlet air required absolute humidity Xao required to obtain said compartment interior set absolute humidity Xset according to: Xao=Kx set· X set− Kxr·Xr−Kxam·Tam−Cx 1 where Kxset is a compartment interior set absolute humidity coefficient; Kxr is a compartment interior absolute humidity coefficient; Kxam is an exterior air absolute humidity coefficient; and Cx 1 is a humidity calculating coefficient; control temperature calculating means for calculating a control temperature Tea for the air to be cooled by said cooling means, based on said outlet air required temperature Tao and said outlet air required absolute humidity Xao; cooling control means for controlling a cooling ability of said cooling means based on said control temperature Tea; and heating control means for controlling a heating ability of said heating means based on said control temperature Tea.