| 摘要 |
PURPOSE:To eliminate the blowing of a continuous current against the face as well as to aim at improvements in driving comfortableness, by changing the impressed voltage of a blower motor into a periodic or irregular mode in time of turning an air blowoff mode to a sense of blowing toward the face. CONSTITUTION:One end of a blower motor 2 is connected to a power source 1 and the other end is connected to a register 3. Likewise, the register 3 is connected to a ground wire 5 via a fan switch 4. And, when a ventilating switch 8, which is turned to ON only when the fan switch 4 is turned to OFF and a select switch 7 is set to a blowoff mode toward the face, a pulse signal whose period varies with time is inputted into a digital-analog converter 9 from a controller 6. With this constitution, the base voltage of a power transistor 10 is made to vary with time, controlling rotation of the blower motor 2 and changing the air quantity. Therefore, the blowing of a continuous current against the face is thus eliminated. |
