By matching the parameters of engine and hydraulic converter, the basic power shift schedule, which took the speed and throttle angle as input, was established. According to the different loading, the pressure of the oil pump was used as the adjusting parameter to adjust the shift schedule. Considering the ramp, the fuzzy adjusting strategy was adopted to adjust the foundational gear. The effective of the proposed method was validated in the test. The result indicated that as the loading increased, the shift points would increased about 2-5 km/h, so that the best power performance could be obtained. The forklift truck always ran with one gear on the lamp to avoid it sliding down. This proposed method can enrich the manipulating theory of forklift truck and could be applied in practice.%通过对叉车发动机与液力变矩器的参数进行匹配计算,建立基于车速和油门开度的基本动力性换挡规律；并利用油泵压力作为修正参数建立不同载荷的换挡规律；对于坡道工况,采用模糊修正策略,对换挡规律输出的理论挡位进行修正,并在实车试验中验证了控制方法的正确性.试验结果表明,基于油泵建立的修正策略,在载荷增加时能够使换挡点车速延迟2～5 km/h,使车辆获得最佳的动力性；并且在坡道上始终以1挡运行,防止叉车溜坡.该研究丰富了叉车控制理论,并给出了一种实际可用的控制方法.
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