| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lift system implementing feedfoward control based on velocity. <P>SOLUTION: There is disclosed a hydraulic system for lifting a working tool of a movable machine. The hydraulic system may include a pump, lift actuator, lift valve device, and a lift sensor generating a first signal indicative of an actual lift velocity. Further the hydraulic system may include a tilt actuator, tilt valve device, and at least a single operator interface device for operating to generate a second signal indicative of a desired lift velocity and a third signal indicative of a desired tilt angle. Furthermore, the hydraulic system may include a controller that commands the lift valve device to measure pressurized fluid from the second signal, commands the tilt valve device to measure the pressurized fluid from the third signal, and commands the tilt valve device to measure the pressurized fluid selectively from the first and second signals and to maintain a desired tilt angle of the working tool during lifting. <P>COPYRIGHT: (C)2013,JPO&INPIT |
