Abstract
The hydraulic drive valve intelligent control system was discussed. Two grades, the field cell and the remote control cell, were used in the distributed control system. The communications of the system were implemented by Controller Area Network (CAN). At the first grade, single-chip microcomputer (SCM) acted as the control chip. The sampling pressure signal in pipeline was transformed into the output digital control signal by the controller. The digital direction valve acted as a transformation unit which converts the electric signal to mechanical action in the hydraulic circuit. The control process was realized by the digital signal directly acting on the step electrical motor. At the second grade, the industrial-control computer with a favorable man-machine conversation interface was used to realize monitor function.
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