| 摘要 |
<p>PURPOSE:To reduce power consumption and an impact by controlling a drive motor by the outputs of speed instructing means and soft accelerating circuit means, thereby preventing the abrupt acceleration. CONSTITUTION:A differential amplifier 8 outputs a factor due to the magnitude of a curve of an induction line 18, a measuring circuit 86 outputs a distance factor to an obstacle 85, a speed setter 82 ouptus a high/low speed command factor from a permanent magnet 24 under the road surface, and a target speed setter 85 outputs a target speed set value in response to the respective factors. An addition amplifier 73 outputs a signal produced by adding a signal in response to a deviation between a target speed set value and an actual traveling speed and the actual traveling speed, and a soft accelerating circuit 79 outputs a signal gradually decreasing from a voltage corresponding to the low speed to a voltage corresponding to the high speed. A pulse width modulator 67 controls the ON duty of a shunt field in response to a larger signal of the outputs of the amplifier 67 and the circuit 79.</p> |
