Patent ID: 7972238
Filing Date: 2011-07-05
Classification: E02F,F02D,Y10T

Abstract:
1. A working vehicle comprising: an engine; a left drive wheel and a right drive wheel configured and arranged to be driven by a drive force from the engine; a first power transmission mechanism configured and arranged to transmit the drive force from the engine to the left drive wheel and the right drive wheel; a hydraulic pump configured and arranged to be driven by the drive force from the engine; a turning mechanism having a hydraulic motor configured and arranged to be driven by pressurized oil from the hydraulic pump and a second power transmission mechanism configured and arranged to transmit the drive force of the hydraulic motor to the right drive wheel and the left drive wheel, the turning mechanism being configured and arranged to cause the working vehicle to turn by differentiating a rotational speed of the right drive wheel from a rotational speed of the left drive wheel; and a control unit configured to control the engine based on an engine power curve indicating a relationship between an engine speed and an engine output torque, the control unit being further configured to calculate an absorption horsepower of the hydraulic pump, and to change the engine power curve used to control the engine based on the absorption horsepower.