INTELLIGENT CONTROL OF AN ELECTROHYDRAULIC MOTOR DRIVE SYSTEM

The latest developments in programmable digital valve control cards ma ke it possible to integrate a number of intelligent features to signif icantly improve the performance of fluid power systems. An ostensibly open-loop motor speed drive is considered using proportional valve tec hnology, a two-axis digital electronic drive card being used to actuat e a flow control valve and a pressure control valve. It is shown how s teady-state speed control can be improved while simultaneously optimis ing efficiency, reducing supply power, and improving the dynamic behav iour.