| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To simplify each work of a tractor, a wheel loader, or the like for frequently performing each operation of switch between forward movement and backward movement, travel stop, and start. <P>SOLUTION: This controller comprises a speed change sensor, an actuator for adjusting the cam plate angle of a hydraulic pump, based on a detected value of the speed change sensor, a rotation sensor of a speed change output section, a sub speed switching means for switching a sub speed change mechanism, and a control means. When a low-speed side operation of the sub speed switching means is recognized, control is performed so that the speed ratio of a hydraulic continuously variable transmission is reduced to a certain value or lower, and a forward clutch or backward clutch in the ON state is disengaged. Substantially synchronously with the disengagement of the forward clutch or backward clutch in the ON state, control is performed so that, the speed change driving output from the hydraulic continuously variable transmission is speeded up. When the rotation speeds on the input side and output side of the forward clutch or backward clutch substantially match with each other, the forward clutch or backward clutch in the ON state just before the sub speed switching means is operated to the low speed side is controlled to be turned on again. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
