Patent ID: 9676600
Date: 2017-06-13
CPC Classifications: B66F,F16H

Claim:
1. A forklift equipped with a variable displacement traveling hydraulic pump driven by an engine, a hydraulic motor that forms a closed circuit with the traveling hydraulic pump therebetween and is driven by hydraulic oil discharged from the traveling hydraulic pump, and driving wheels driven by the hydraulic motor, the forklift comprising: an accelerator operation unit that performs operation for increasing or decreasing an amount of fuel supplied to the engine; an accelerator opening sensor that detects an accelerator opening which is an operation amount of the accelerator operation unit; and a control device that has a modulation control unit configured to calculate a value delayed depending on a setting value of a cut-off frequency or a time constant of the accelerator opening as a corrected accelerator opening, and a target maximum absorption torque setting unit configured to calculate a target maximum absorption torque of the traveling hydraulic pump or a target swash plate tilting angle of a swash plate provided in the traveling hydraulic pump depending on the corrected accelerator opening, and controls the traveling hydraulic pump, wherein the modulation control unit calculates, with reference to a table on which the setting value of the cut-off frequency or the time constant according to at least the corrected accelerator opening is described, the setting value by a corrected accelerator opening obtained at a previous control cycle, and calculates a corrected accelerator opening of a current control cycle by correcting the accelerator opening detected by the accelerator opening sensor using the obtained setting value, and the target maximum absorption torque setting unit calculates the target maximum absorption torque or the target swash plate tilting angle depending on the corrected accelerator opening of the current control cycle.