| 摘要 |
PURPOSE:To easily control the angle of cutting edge on a driver seat by a method in which the situation of working site is determined from the position of a speed lever and the angle of vehicular body, and the angle of blade cutting edge is calculated and controlled through a micro-computer. CONSTITUTION:When a change-gear stage switch 11 turns ON and is on A', signals from a vehicular speed stage detector 12 and a vehicular angle detector 13 for knowing the contents of working are put in a control circuit 17 through a switch circuit 20. According to each vehicular speed stage, on the basis of data on pitch angle for inclination angle and also for speed lever, proper cutting edge angle according to operations is read out in the circuit 17 in accordance with signals from the detectors 12 and 13, sent out through an output circuit 22 to a pitch cylinder servo-valve 25, and fed back to a conversion circuit 23. In the circuit 17, deviation with a set pitch angle is judged and correcting signal is sent out to the valve 25. The given pitch angle can thus be controlled to a proper cutting edge angle.
|
