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Sliding control of solenoid valve pneumatic actuators
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Sliding control of solenoid valve pneumatic actuators

Category : Hydraulics And Pneumatics

Sub Category : Industry

Project Code : ITMH05

Project Abstract

A pneumatic actuator with solenoid valves is a discontinuous-input system because each valve can be either in on or off state. For such an actuator, this paper proposes a sliding- ode control scheme that is based on an averaged continuous-input model of the discontinuous-input open-loop system. The averaged model is obtained from the nonlinear dynamics of the open-loop system. For the sliding control design, we note that a pneumatic actuator has two chambers with a total of four ON/OFF valves. Thus, there are sixteen possible combinations for the valves’ switching. Seven of these sixteen operating “modes” are considered both functional and unique. The proposed sliding control utilizes and switches between these seven modes of the open-loop system in order to select the ones with necessary and sufficient amounts of drive energy. In comparing the new seven-mode controller to previous controllers, we will demonstrate reductions in the position tracking error and the number of switches made by the actuator’s ON/OFF valves. The proposed control scheme is used in both position control of a pneumatic cylinder and bilateral control of a one degree of freedom tele-operation system. Experimental results are presented to validate our theoretical findings.

Working principle:

                   The air from compressor will enters into FRL unit, where the air pressure has been regulated to required rate. This system has four solenoid operated DCVs which helps to control cylinder sliding motion by giving combinational inputs to DCVs. In these DCVs has solenoid (ON/OFF) switches, when these switches are operated it will send the supply to cylinder area, So that we can move the piston to required position.

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