Patent ID: 9133862
Filing Date: 2015-09-15
Classification: B60W,B60Y,E02F,F15B,F16H

Abstract:
1. A work vehicle comprising: an engine; a throttle opening degree setting unit configured to set a throttle opening degree of the engine; a first hydraulic pump driven by the engine; a travel hydraulic motor driven by hydraulic fluid discharged from the first hydraulic pump; a second hydraulic pump driven by the engine; a work implement driven by hydraulic fluid discharged from the second hydraulic pump, the work implement having a bucket and a boom for supporting the bucket; a first control unit configured to set an upper limit for the throttle opening degree in accordance with a determination result as to whether or not the work vehicle is performing excavation work; and a second control unit configured to control output of the engine based on the smaller of the throttle opening degree set by the throttle opening degree setting unit and the throttle opening degree set by the first control unit, wherein the first control unit is configured to set the upper limit of the throttle opening degree based on throttle upper limit information for specifying the upper limit of the throttle opening degree with respect to vehicle speed, the throttle upper limit information includes first throttle upper limit information, second throttle upper limit information for specifying a lower upper limit of the throttle opening degree with respect to the vehicle speed than the first throttle upper limit information, and third throttle upper limit information for specifying a lower upper limit of the throttle opening degree with respect to the vehicle speed than the second throttle upper limit information, the first control unit is configured to set the upper limit of the throttle opening degree based on the third throttle upper limit information when the determination result indicates that the work vehicle is performing excavation work and when the work implement is not in use, the first control unit is configured to set the upper limit of the throttle opening degree based on the second throttle upper limit information when the determination result indicates that the work vehicle is performing excavation work and when the work implement is in use, and the first control unit is configured set the upper limit of the throttle opening degree based on the first throttle upper limit information when an angle in a longitudinal direction of the boom, defined so that a value of the angle increases upward, is equal to or greater than a predetermined angle, even when the determination result indicates that the work vehicle is performing excavation work.