2016 Volume 5 Issue 4 Pages 102-107
Networked control systems (NCSs) using the Internet will soon become widespread. In NCSs, time delays and information losses cause system performance degradation and destabilization. It is known that a communication disturbance observer (CDOB)-based compensator can estimate and suppress the effect of time delays on the system as a network disturbance. We applied a CDOB-based compensator to NCSs with not only time delays but also information losses and theoretically analyzed the information-loss compensation scheme. However, the performance of the CDOB-based compensator for only information losses in real NCSs has not been experimentally evaluated. This letter demonstrates an information-loss compensation scheme using a CDOB for NCSs. Experiments using a networked motion control system show that the CDOB-based compensator can estimate and suppress the effect of information losses on an NCS.