engleski

Precise force control for hydraulic and pneumatic press system

This paper presents the force control methods for a pneumatic and a hydraulic press. Both systems have been made for educational purposes as well as for experimental testing and verification of different control techniques. The pneumatic press contains a proportional pressure valve which is used for pressure regulation in a cylinder chamber and has direct impact on controlled force. The proportional pressure regulator also allows an indirect calculation of the cylinder force by measuring the control pressure at the valve outlet, which is less precise than direct measurement of pressing force by using a force transducer. Arduino board was used as a controller for the pneumatic press and it can be programmed via Arduino hardware support for Matlab/Simulink program or via Arduino open-source platform. The control algorithm is implemented in the Matlab/Simulink environment, which allows executing the simulation program in external mode, similar to the Real-Time Workshop tool. The hydraulic press contains a servo-solenoid pressure-control valve for regulating the cylinder pressure. The pressing force can also be indirectly measured by a pressure transducer which is installed in the cylinder chamber. Similar to the case of the pneumatic press, more precise measurement of the pressing force can be achieved with a force transducer. The control algorithm has been implemented on a real-time hardware board by using the Real-Time Workshop tool for generating the C code and building an executive program. Experimental tests have shown that electrically actuated control components supported by the appropriate measuring devices and computer programs make it possible to improve the characteristics of the hydraulic and pneumatic systems required in modern industrial plants.

press, hydraulic and pneumatic, force control, pressure sensor, force sensor, simulation

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