| 摘要 |
PROBLEM TO BE SOLVED: To perform smooth operation without causing hunting by providing a control equipment adding transient characteristics to control signals of discharge control means after judging the operating condition of operation means. SOLUTION: As transfer operation detecting means for detecting the transfer operation of a traveling pilot transfer valve 10, a pressure sensor 35 is provided, and the signal from the sensor 35 is input to a controller 34. Next, an electromagnetic proportional pressure reducing valve 32 detecting the pilot pressure for a regulator 23 of a hydraulic pump 22 is connected, the controller 34 judges based on the signal from the sensor 35, calculates a command current value to which transient characteristics are added to suppress the fluctuation of the signal to a minimum within a control period time set by the controller 34, and the command current value is output to a solenoid 37 of the pressure reducing valve 32. By doing this, a sudden fluctuation in the tilting of pump swash plate can be reduced, and thus a sudden change in pump discharge can be restricted so that smooth traveling without hunting can be carried out. |
