OPTIMIZED PULSE MODULATION - A NOVEL IDEA OF A DIGITAL CONTROL METHOD FOR ON/OFF VALVES

摘要

This article describes how on/off valves can be used in the closed loop control. After studying different industrial hydraulic applications typical requirements will be compiled. From these requirements a basic on/off'valve architecture will be derived. In this article the number of parallel connected on/off valves per control edge is limited to one valve. So the typical digital hy draulics with a high number of parallel connected valves is not considered. The on/off valves could not be controlled like nor mal directional valves. To control on/off valves digital control methods are common to use. The digital control methods are not optimized for the hydraulic on/off valves, because the origins of the digital control methods will be found in the electrical engi neering. The novel idea for the digital control methods is the optimized pulse control which eliminates the disadvantages of the common digital control methods. How the optimized pulse control works is described in this article.