— In past research on the control of pneumatic
actuators, typically proportional servo valves have been used for
achieving high-performance control of the mass flow rate. In this
brief, we instead use fast-switching ON/OFF valves due to their
distinct advantages in terms of low cost and small size. Accurate
control of pneumatic actuators with ON/OFF solenoid valves
is a challenge since the system dynamics is both discrete
input and highly nonlinear. In this brief, we apply a hybrid
control algorithm to a pneumatic actuator with ON/OFF valves.
Such a control approach is developed for choosing the best
control vector at each sample time to track the reference state
(i.e., desired force) in the inner force control loop within a
bilateral teleoperation system. Experimental results show that
good teleoperation transparency is achieved despite all the
obstacles such as discrete input and nonlinear behavior of the
pneumatic-actuated teleoperation system.
Index Terms— Bilateral control, haptic teleoperation,
hybrid control, ON/OFF solenoid valve, pneumatic actuators,
transparency
— In past research on the control of pneumaticactuators, typically proportional servo valves have been used forachieving high-performance control of the mass flow rate. In thisbrief, we instead use fast-switching ON/OFF valves due to theirdistinct advantages in terms of low cost and small size. Accuratecontrol of pneumatic actuators with ON/OFF solenoid valvesis a challenge since the system dynamics is both discreteinput and highly nonlinear. In this brief, we apply a hybridcontrol algorithm to a pneumatic actuator with ON/OFF valves.Such a control approach is developed for choosing the bestcontrol vector at each sample time to track the reference state(i.e., desired force) in the inner force control loop within abilateral teleoperation system. Experimental results show thatgood teleoperation transparency is achieved despite all theobstacles such as discrete input and nonlinear behavior of thepneumatic-actuated teleoperation system.Index Terms— Bilateral control, haptic teleoperation,hybrid control, ON/OFF solenoid valve, pneumatic actuators,transparency
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