Patent ID: 7269963

Claim:
A vehicle air conditioning apparatus for performing air conditioning control in a vehicle passenger compartment by controlling a heater and a cooler, said apparatus comprising: an outside air temperature sensor which detects an outside air temperature Tam of a vehicle at time tA; a vehicle interior temperature sensor which detects a vehicle interior temperature Tr of said vehicle at said time tA; a solar radiation amount sensor which detects a solar radiation amount Ts on said vehicle at said time tA; a stable vehicle interior surface temperature-calculator which calculates a vehicle interior surface temperature Tna of a window glass in a stable state at said time tA by an expression: Tna=k 1· Tr+k 2· Tam+k 3 ·Ts wherein parameters k 1 to k 3 are determined by physical characteristics of said window glass and said vehicle passenger compartment; a transient vehicle interior surface temperature-calculator which calculates a vehicle interior surface temperature Tn of said window glass in a transient state at said time tA by expressions: Tn′=Tna −( Tna−Tn 1)exp(−φ t ) Tn≈Tnτ′ wherein Tn 1 is an initial value of said vehicle interior surface temperature Tn, t is elapsed time from a state of said initial value Tn 1 to said time tA, τ is response delay time of temperature change of a vehicle interior surface of said window glass, and a parameter φ is determined by said physical characteristics of said window glass and said vehicle passenger compartment provided that Tnτ′ is a vehicle interior surface temperature Tn′ calculated at time before said time tA by said response delay time τ; wherein said air conditioning control is performed by using said vehicle interior surface temperature Tn.