| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control device of a hydraulic working machine, capable of preventing false detection of an operation signal due to mixed air, improving reliability of an electric actuator drive control and preventing reduction in operability. <P>SOLUTION: The control device includes: a plurality of pilot duct lines 45 connecting the output port 42 of an operation device 4 to the input port 71 of a pattern changeover valve 17; a pressure sensor 86 disposed in the pilot duct line 45 where there is a possibility of passage of a hydraulic signal to be used to control a rotary motor 16; a changeover valve 87 disposed at a position between the pressure sensor 86 and the input port 71; and a controller unit 11 which detects the pilot duct line 45 where a hydraulic signal to be used to control the rotary motor passes based on the operation pattern of the operation device 4, controls the rotary motor based on an electric signal from the pressure sensor 86 on the pilot duct line, and shuts the hydraulic signal by the changeover valve 87 on the pilot duct line. <P>COPYRIGHT: (C)2012,JPO&INPIT |
