Patent ID: 6854523

Claim:
A working vehicle for carrying out work at a low running speed, said working vehicle comprising: an engine to provide a driving force; a fuel injection pump for feeding fuel to the engine; an injection rate control unit for controlling a fuel feed rate from the fuel injection pump to the engine; a revolution speed detecting unit for detecting an actual revolution speed of the engine; and a controller for adjusting a running speed by controlling a revolution speed of the engine to a target revolution speed according to the actual revolution speed detected by the revolution speed detecting unit, wherein the controller comprises: a revolution speed comparison program unit for comparing the actual revolution speed to the target revolution speed; and an injection rate signal output program unit for outputting an injection rate signal corresponding to a result of comparison in the revolution speed comparison program unit to the injection rate control unit; and a target revolution speed setting program unit for calculating and setting the target revolution speed based on the actual revolution speed detected by the revolution speed detecting unit, such that when the actual revolution speed is equal to a revolution speed for idling in a low speed area, the target revolution speed setting program unit sets the target revolution speed by subtracting a prespecified revolution speed from the actual revolution speed.