| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electrically-driven carrier vehicle which allows an accurate estimation of the weight of a transported object even when multiple electrically-driven carrier vehicles are travelling individually. <P>SOLUTION: A current value I is measured while an unmanned carrier vehicle 1 is regularly travelling at a constant travel velocity V. Since a load applied to an electrically-driven motor 8 for wheel drive tends to be easily stabilized when the unmanned carrier vehicle 1 is travelling at a constant travel velocity V, a stable current value I with small variation width W can be measured. On the other hand, when several unmanned carrier vehicles 1 are travelling individually for respective destinations, as a period during which each unmanned carrier vehicle 1 is regularly travelling at a constant velocity V is long, a lot of (a sufficient amount of) stable current values I with small variation width W can be collected at least during the period. Thus, the weight W2 of a transported object can be accurately obtain in calculation of the weight W2, because a lot of (a sufficient amount of) stable current values I with small variation width W the weight can be used for the calculation. <P>COPYRIGHT: (C)2013,JPO&INPIT |
