Mode Switching Control Method for Man-Machine Collaborated Robotic Systems (Switching from Power-Assist Mode to Automatic Positioning Mode)

摘要

In the industrial world, not only autonomous machinery as industrial robots but also man-machine cooperative systems as power-assist systems have attracted special interest recently. Kondo, et al. proposed the scheme of Man-Machine Collaborated Systems (MMCSs) and its application to some assembling work. In MMCSs, efficient mode switching from human-oriented task to machine-oriented task is important. However, its issue has not been fully addressed yet. This study discusses a mode switching control method for MMCSs. Especially, we treat the switching from a power-assist mode (PAM) to an automatic positioning mode (APM) for a simple robotic system. To obtain a smooth switching, this study utilizes a two-degree-of-freedom control system structure which consists of an on-line impedance control simulator and an LQI servo controller. Some smooth reference generation for APM is also introduced. No input saturation and stopping appear at the switching in this method. The effectiveness of the method is verified experimentally.