AIR CONDITIONING CONTROL DEVICE FOR VEHICLE

PURPOSE:To provide fine control of gas quantity by applying minimum applied voltage necessary to rotate a blower motor set by a main changeover means in a positive direction to the blower motor after changing over to a reverse polarity by an auxiliary change-over means to regulate the gas quantity of a blower to an ultra low wind amount. CONSTITUTION:When the contact piece 60 of a change-over switch 50 is changed over to the first terminal 51 side in the gas quantity adjusting circuit 30 of an air conditioning device AC, applied voltage approximately equal to power supply voltage is applied to the positive polarity of a blower motor 1 through a line L1, a relay 32, a line L5, a relay 38, a line L6 and the change-over switch 50, and the blower motor 1 rotates in a positive direction at maximum rotational speed. When the change-over contact piece 60 of the change-over switch 50 is changed over to the second terminal 52 and the third terminal 53 sides in order, applied voltage is reduced step by step by a division resistance 45, so the rotational speed of the blower motor 1 goes down step by step. When the change-over contact piece 60 of the change-over switch 50 is changed over to the fifth terminal 55 side, the blower motor 1 rotates in a reverse direction, and the blower 2 blows off an ultra low wind amount.