| 摘要 |
PURPOSE:To favorably prevent shortage of driving torque and worsening of riding comfortableness by conducting no shift-up operation from the first speed to the second speed in a range where an acceleration opening is less than 60%. CONSTITUTION:A speed change line for shifting up from the first speed to the second speed is set in such a manner as to intersect a theoretical car velocity line showing a theoretical car velocity theoretically determined from an acceleration opening in a range where the acceleration opening is more than 60% and more. Accordingly, in a range where the acceleration opening is less than 60%, shift-up from the first speed to the second speed is not conducted, so that speed change operation is not performed at the time of cargo work requiring comparative high driving torque at comparative low car velocity such as loading a cargo on a fork or pushing a cargo into a designated place. Thus, shortage of driving torque and worsening of riding comfortableness can be prevented favorably. |
