Implementation of Fuzzy Force Control for an Electrohydraulic Servo Press System
In this chapter, based on the fuzzy method, a PC-based precision force control scheme is proposed for the electrohydraulic servo press system. The main feature of proposed scheme is to develop a composite control of relief valve and flow servo valve. With
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Abstract In this chapter, based on the fuzzy method, a PC-based precision force control scheme is proposed for the electrohydraulic servo press system. The main feature of proposed scheme is to develop a composite control of relief valve and flow servo valve. With the feedback of force sensor, the fuzzy-based control system is realized by LabVIEW for achieving the precision force control of hydraulic cylinder. In the experimental testing, a practical platform of hydraulic servo press system is used to demonstrate the effectiveness of proposed scheme. The testing results indicate the accurate output responses. Keywords Force control • Electrohydraulic servo press system • Composite control • Relief valve • Flow servo valve • LabVIEW
1 Introduction In general, the motor is always the main power source of mechanical system. Instead of manpower, the motors are used to accomplish many kinds of tasks. According to the different transportation ways, the mechanical systems possess different properties. The precision of position control is relating to the property and mechanical architecture of motor. Unfortunately, some motors are not satisfied for the market requirements because of its horsepower and volume. Therefore, the hydraulic system [1] has been widely applied in the case of small volume and large horsepower.
H.-M. Chen (*) • C.-S. Shen • G.-W. Yang Department of Electronic Engineering, Chienkuo Technology University, Changhua 50094, Taiwan e-mail: [email protected] J. Juang and Y.-C. Huang (eds.), Intelligent Technologies and Engineering Systems, Lecture Notes in Electrical Engineering 234, DOI 10.1007/978-1-4614-6747-2_47, # Springer Science+Business Media New York 2013
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The transportation media of hydraulic system is based on liquid. In early stage, the hydraulic cylinder just can be controlled by the ON/OFF switch due to components’ property. Moreover, the pressure of hydraulic cylinder is produced by spring and is regulated by human. The system is inflexible and unavailable for fine tuning. The efficiency of precision control for the hydraulic system is also restricted. In recent years, various precise sensors and servo valves are popularly produced because of the mutual development of semiconductor technology. Accordingly, the high-precision position and force control of hydraulic system [2] can be performed by controlling the movement and liquid flow rate of hydraulic cylinder via servo valves. However, the hydraulic system has the disadvantages of leakage and variation due to the compressibility of oil. The property of system is also changed with the temperature variation of oil. Moreover, the proportional servo valve possesses the problems of dead zone and delay phenomenon. The general linear control schemes are not available to deal with these problems. Therefore, various methods [3] are proposed for achieving the effective control of hydraulic system. Among proposed methods, the fuzzy control is a nonlinear and useful one in the industrial applications [4]. Even without of
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