| 摘要 |
PURPOSE:To control a swing period of a blown grill to the optimum level and improve an air conditioning effect by a method wherein a power source terminal for driving a motor, by which a blown grille is driven, is connected to a split contact of a current limiter of a blower motor. CONSTITUTION:Both an ignition switch 1 and a blower switch 2 become conditions of On and a relay switch 3 becomes on, then, a blower motor 5 starts it rotation. Both a volume 6 and a power transistor 7 control a revolution of the blower motor 5. A register 9 controls to retain the revolution of the blower motor to a minimum level. The volume 6 controls a base current of the transistor 7, thereby, a driving current for the blower motor 5 supplied from the power transistor 7 is controlled, while, even in a case, the volume 6 has reached its maximum level of the load, namely, the supply current from the power transistor 7 is becoming almost nil value, the register 8 is able to supply a required current for the blower motor 5 in predetermined value in order to maintain the revolution of the blower motor 5 above the given value.
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