Considerations about digital pid control of electro-hydraulics equipment

Classic hydraulic systems offer a sum of advantages such as robustness and easy adaptability to some variations of the working environment, being capable of realizing high force and torque values at relatively low costs of implementation and maintenance. The global evolution of electronics and informatics fields had influenced positively hydraulic researches on developing new types of equipment, tending to facilitate an easy integration with digital controllers of computer controlled systems. It has been imposed the concept of intelligent hydraulic equipment, which include in their structure digital electronic modules (with self-diagnosis, auto-adjustment and bus communication features) and specific transducers. These improvements had a positive effect on the dynamic characteristics of electro-hydraulic equipment, some of them being known in technical literature as intelligent electro-hydraulic equipment.