Patent ID: 8386136

Claim:
A construction vehicle comprising: an engine; a travel hydraulic pump driven by the engine; a travel hydraulic circuit through which pressure oil discharged from the travel hydraulic pump flows; a travel hydraulic motor driven by the pressure oil supplied through the travel hydraulic circuit; a travel wheel driven by drive force of the travel hydraulic motor; a work equipment hydraulic pump driven by the engine; a work equipment driven by pressure oil discharged from the work equipment hydraulic pump; a controller configured to control an engine speed, displacement of the travel hydraulic pump, and displacement of the travel hydraulic motor so as to control a vehicle speed and traction force; and an oil pressure limiting component configured to limit travel circuit pressure so as not to exceed a predetermined cutoff pressure value, the travel circuit pressure corresponding to pressure of pressure oil flowing through the travel hydraulic circuit; the controller being configured to implement a pump displacement rapid change suppression control for controlling the displacement of the travel hydraulic pump so that the travel circuit pressure reaches a maximum value equal to or less than the cutoff pressure value when the vehicle has stopped regardless of the engine speed, and the displacement of the travel hydraulic pump gradually increases as the travel circuit pressure decreases from the maximum value.