| 摘要 |
PURPOSE: To secure desired speed by providing an up-and down-signal correcting part to output a solenoid drive signal in which valve flow and hydraulic pump volumetric efficiency are compensated to an opening command means based on a signal of a pressure detection means. CONSTITUTION: As an opening command means 23 receives input of an up or down-command signal through an interface 28, a solenoid drive current Iu, Id is outputted to an up-or down-solenoid proportional pilot valve through a voltage-current converter 29 to actuate an actuator through an up-or down- control valve. In this case, an up-signal correcting part outputs a solenoid drive signal in which valve flow and hydraulic pump volumetric efficiency in up-going of a cage are compensated, and a down-signal correcting part 27 outputs a solenoid drive signal in which both in down-going are respectively compensated. Desired acceleration/deceleration is thus constantly provided to the case, and it can be run at high speed or low speed. |
