| 摘要 |
PURPOSE:To increase a dynamic range of a fine operation area and a fine control area by providing a function generating means to produce a command for opening amount of an operation valve which has a small variation factor of opening amount in the fine operation area of an operation lever. CONSTITUTION:A function generating circuit 7 produces a command for opening amount of an operation valve having a small variation factor of opening amount at least in a fine operation area of an operation lever 1 according to the position of the lever 1. Then the circuit 7 produces a command for opening amount of an operation valve 16 having a large variation factor of opening amount. Thus the valve 16 moves up immediately to a command level of opening amount where the valve 16 starts to open when the shift amount of the lever 1 is set outside a 0-20% range (a 100% shift amount of the lever 1 defined between the neutral and maximum positions) and has a small variation factor of opening amount up to 50% to be opened to its full width within a 50-90% range. In such a way, the dynamic range of fine operation area and a fine control area are increased. Then the operability is improved for a work machine. |
