WORK VEHICLE AND METHOD OF CONTROLLING WORK VEHICLE

摘要

A work vehicle includes a boom, an arm, a bucket, an arm cylinder, a direction control valve, a calculation portion, and a speed determination portion. The calculation portion calculates an estimated speed of the arm cylinder based on correlation between an amount of movement of the spool of the direction control valve in accordance with an amount of operation of an arm control lever and a speed of the arm cylinder. The speed determination portion determines a target speed of the boom based on the estimated speed of the arm cylinder. When the amount of operation of the arm control lever is smaller than a prescribed amount, the calculation portion calculates a speed higher than a speed of the arm cylinder in accordance with correlation as the estimated speed of the arm cylinder.

主权项

1. A work vehicle, comprising:
a boom: an arm; a bucket; an arm cylinder driving said arm; a direction control valve including a movable spool and operating said arm cylinder by allowing supply of a hydraulic oil to said arm cylinder as said spool moves; a calculation portion calculating an estimated speed of said arm cylinder based on correlation between an amount of movement of the spool of said direction control valve in accordance with an amount of operation of an arm control lever and a speed of said arm cylinder; and a speed determination portion determining a target speed of said boom based on the estimated speed of said arm cylinder, said calculation portion calculating a speed higher than the speed of said arm cylinder in accordance with the correlation between the amount of movement of the spool of said direction control valve in accordance with the amount of operation of said arm control lever and the speed of said arm cylinder as the estimated speed of said arm cylinder when the amount of operation of said arm control lever is smaller than a prescribed amount.