| 摘要 |
<p>PURPOSE:To make it possible for an electric motor car to get over the gig road level or to climb up a short steep slope by increasing a maximum value of current for a specified time when the command value comes to maximum. CONSTITUTION:When a driving current from a battery 12 to a motor 10 reaches a current Imax set up by a maximum current setting circuit 32, the driving current of the motor 10 is limited to a current value Imax for some time due to the action of a current limiting circuit 30. When the delay time T1 of an on-delay timer 50 elapses from that moment (interpreting that a larger output is demanded as the accelerating pedal is being continuously pressed), the set voltage of a divider 54 is added to the maximum current setting circuit 32 for a specified period. As a result, the driving current of the motor 10 is increased to the current Ipeak, more powerful than the maximum current Imax to which is has been limited so far.</p> |
