There are many possible solutions to this issue. Some may be better suited for your application depending on what hardware you currently have. One solution may be to use LabVIEW Real-time with a Fieldpoint System. You would use LabVIEW to write your control algorithm and Fieldpoint to interface to your hydraulic system. There are some examples for using PID control. And here is a link to an interactive presentation using PID with Fieldpoint. http://zone.ni.com/devzone/conceptd.nsf/webmain/7FC16BD6B721E80B86256CD30074ABD6?opendocument
Again this is just one possible solution to you problem. You may want to contact your area sales representative to discuss more about your system. They are very capable of putting together the correct software/hardware options for your application. Regards, Joseph D. National Instruments
