Patent ID: 9074546
Filing Date: 2015-07-07
Classification: E02F,F02D

Abstract:
1. A work vehicle comprising: an engine; a travel device configured to cause the work vehicle to travel by drive force from the engine; a work implement driven by drive force from the engine; a first detector configured to detect engine rotation speed; a second detector configured to detect a vehicle speed; and a controller configured to determine whether low-load conditions that show that the work vehicle is in a low-load state have been satisfied, wherein the controller is configured to control the engine so that an upper limit value of an output torque of the engine when the low-load conditions are satisfied is made less than when the low-load conditions are not satisfied, the controller is configured to vary a reduction amount of the upper limit value of the output torque of the engine when the low-load conditions are satisfied, in accordance with variation in the at least one of the vehicle speed, the vehicle acceleration, and the engine-rotation-speed acceleration detected by the second detector, and in accordance with variation in the engine rotation speed detected by the first detector, and when the vehicle speed is less than a first predetermined speed, and when the vehicle speed is greater than a second predetermined speed that is greater than the first predetermined speed, the controller is configured to reduce the reduction amount to be less than when the vehicle speed is equal to or greater than the first predetermined speed and equal to or less than the second predetermined speed.