| 摘要 |
PURPOSE:To simply stabilize the performance of all working vehicles by a method in which an indicator for valve opening degree and a controller for proportional valve are operated by utilizing a slewing speed arithmetic unit and a displayer which are provided for the slewing type working vehicle. CONSTITUTION:On the basis of information from an operation condition sensor 15 and an angle sensor 17, a slewing base 2 is automatically operated toward a direction for matching an operating direction under a condition that lever operation is put under a starting command, and with a preset slewing speed pattern. The slewing base is then automatically stopped at a stop position by automatically operating an operating valves 7 and 8 by giving an output V for speed-regulating command to a proportional valve controller 11. The regulator can thus be simply and exactly adjusted while watching a displayer.
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