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Formerly, it was necessary to empirically infer the operating hours of a forklift per charge as the most important factor in studying the replacement of internal-combustion engine forklifts with battery-powered ones. However, this process greatly depends on the personfs subjectivity, and was not satisfactorily accurate even though it required substantial labor. To solve this problem, Sumitomo Nacco Material Handling Co.,Ltd. (Sumitomo Nacco MH) has developed a system that infers the electric current consumption per unit time by analyzing various operation data using a measuring instrument installed on the operating vehicle. This system calculates the above electric current con-sumption using simplified relational expressions in which the severity of operation is represented by load, vehicle weight and acceleration excess rate in order to enable even a small-scale, low-accuracy measuring instrument and analyzer to achieve the calculation. This article reports the achievement of inference value calculation with practical accuracy in actual transfer operation.
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