초록 ▼

A window glass dew-point compartment interior absolute humidity Xrmax is acquired, and a temporary compartment interior set absolute humidity Xset (temporary Xset) is determined from a compartment interior set temperature Tset. A smaller one of Xrmax and (temporary Xset) is used as a compartment int

A window glass dew-point compartment interior absolute humidity Xrmax is acquired, and a temporary compartment interior set absolute humidity Xset (temporary Xset) is determined from a compartment interior set temperature Tset. A smaller one of Xrmax and (temporary Xset) is used as a compartment interior set absolute humidity Xset. An outlet air required absolute humidity Xao required to obtain Xset is calculated taking into account the humidity of exterior air introduced into the passenger compartment. Using Xao and an outlet air required temperature Tao required to obtain Tset, a control temperature Tea for controlling a compressor is determined.

대표청구항 ▼

What is claimed is: 1. 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 compart

What is claimed is: 1. 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: description="In-line Formulae" end="lead"Tao=Ktset쨌Tset-Ktr쨌Tr-Ktam쨌Tam-Kts쨌Ts-Ct description="In-line Formulae" end="tail" 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: description="In-line Formulae" end="lead"Xao=Kxset쨌Xset-Kxr쨌Xr-Kxam쨌Tam-Cx1 description="In-line Formulae" end="tail" 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 Cx1 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. 2. A vehicular air conditioner according to claim 1, wherein said control temperature calculating means calculates said control temperature Tea such that if Xrmax≦Xr, then Tea=min where min is a lower limit temperature at which said cooling means is not frosted; if Xrmax>Xr, (Tset-δ)≦Tr, and (Xset-γ)>Xr, then Tea=Tao-α where δ is a predetermined margin; γ is a predetermined margin; α is a constant; if Xrmax>Xr, (Tset-δ)>Tr, and (Xset-γ)≦Xr, then Tea=T(Xao)-η where η is a calculating coefficient; T(Xao) is a temperature at which said outlet air required absolute humidity Xao is achieved with the relative humidity of 100%; if Xrmax>Xr, (Tset-δ)≦Tr, and (Xset-γ)≦Xr, then Tea=a smaller one of Tao-α and T(Xao)-η; and if Xrmax>Xr, (Tset-δ)>Tr, and (Xset-γ)>Xr, then Tea=β where β is a constant. 3. A vehicular air conditioner according to claim 1, wherein said window glass compartment interior surface temperature acquiring means comprises an exterior air temperature sensor for detecting the exterior air temperature as said window glass compartment interior surface temperature Tg. 4. A vehicular air conditioner according to claim 1, wherein said window glass compartment interior surface temperature acquiring means comprises a window glass temperature sensor for detecting said window glass compartment interior surface temperature Tg. 5. A vehicular air conditioner according to claim 1, wherein said compartment interior absolute humidity acquiring means comprises a compartment interior humidity sensor for detecting said compartment interior absolute humidity Xr. 6. A vehicular air conditioner according to claim 1, further comprising: memory means for storing a psychrometric chart representing the relationship between air temperatures and absolute humidity for causing condensation at respective said air temperatures; wherein said window glass dew-point compartment interior absolute humidity acquiring means acquires an absolute humidity with said window glass compartment interior surface temperature Tg as a dew point as said window glass dew-point compartment interior absolute humidity Xrmax, from said memory means. 7. A vehicular air conditioner according to claim 1, further comprising: memory means for storing a psychrometric chart representing the relationship between air temperatures and absolute humidities with respect to allowable upper limit relative humidities at respective said air temperatures; wherein said temporary compartment interior set absolute humidity acquiring means acquires an absolute humidity with respect to an allowable upper limit relative humidity at said compartment interior set temperature Tset as said temporary compartment interior set absolute humidity (temporary Xset), from said memory means. 8. A method of controlling a vehicular air conditioner, comprising the steps of: acquiring a window glass compartment interior surface temperature Tg; acquiring a window glass dew-point compartment interior absolute humidity Xrmax with said window glass compartment interior surface temperature Tg as a dew point; 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; setting a compartment interior set absolute humidity Xset such that if Xrmax>temporary Xset, then Xset=temporary Xset, and if Xrmax≦temporary Xset, then Xset=Xrmax; acquiring a compartment interior absolute humidity Xr; calculating an outlet air required temperature Tao required to obtain said compartment interior set temperature Tset according to the equation: description="In-line Formulae" end="lead"Tao=Ktset쨌Tset-Ktr쨌Tr-Ktam쨌Tam-Kts쨌Ts-Ct description="In-line Formulae" end="tail" 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; calculating an outlet air required absolute humidity Xao required to obtain said compartment interior set absolute humidity Xset according to the equation: description="In-line Formulae" end="lead"Xao=Kxset쨌Xset-Kxr쨌Xr-Kxam쨌Tam-Cx1 description="In-line Formulae" end="tail" 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 Cx1 is a humidity calculating coefficient; 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: controlling a cooling ability based on said control temperature Tea; and controlling a heating ability based on said control temperature Tea. 9. A method according to claim 8, wherein said control temperature Tea is calculated such that if Xrmax≦Xr, then Tea=min where min is a lower limit temperature at which said cooling means is not frosted; if Xrmax>Xr, (Tset-δ)≦Tr, and (Xset-γ)>Xr, then Tea=Tao-α where δ is a predetermined margin; γ is a predetermined margin; α is a constant; if Xrmax>Xr, (Tset-δ)>Tr, and (Xset-γ)≦Xr, then Tea=T(Xao)-η where η is a calculating coefficient; T(Xao) is a temperature at which said outlet air required absolute humidity Xao is achieved with the relative humidity of 100%; if Xrmax>Xr, (Tset-δ)≦Tr, and (Xset-γ)≦Xr, then Tea=a smaller one of Tao-α and T(Xao)-η; and if Xrmax>Xr, (Tset-δ)>Tr, and (Xset-γ)>Xr, then Tea=β where β is a constant.