Compound Control of Electromagnetic Linear Actuator Based on Fuzzy Switching

Abstract

Due to the motion control system of electromagnetic linear actuator (EMLA) is a nonlinear system with poor controllability; single control strategy has been difficult to meet the requirements of its control. A compound control strategy based on inverse system control (ISC) and proportional-integral (PI) is Keywords: electromagnetic linear actuator, fuzzy switching, inverse system, PICopyright © 2017 Universitas Ahmad Dahlan. All rights reserved. IntroductionWith linear position servo's characteristics of high performance, high response and high precision, EMLA has been widely used in many fields, such as direct drive type servo valve [1], electromagnetic gas distribution mechanism [2], and automatic transmission (AMT) etc. While get applied at the same time, it has also put forward higher requirement to its control strategy. On the one hand, it can meet the performance index of control accuracy as far as possible in the steady state response; On the other hand, response should be fast enough to shorten the adjust time of reaching the target position as far as possible in the transient response.Regarding motion control requirement of high performance, In literature [3], Liu and Chang uses inverse system control algorithm, and also applies to electromagnetic valve actuator. It obtains a high response but also has a good seating control at the same time. In order to improve its anti-interference ability and system robustness, An auto disturbance rejection control algorithm is used which based on extended state observer in [4]. In addition, the fuzzy control of direct torque control of induction motor studied in depth [5]. It has outstanding contribution to the improvement and progress of system performance. Using a single control strategy has a good control performance on the one hand, but there is still room for improvement in adaptability [6]. But the compound control strategy is adopted, when switching the algorithm, due to the selection of switching position, it will cause system jitter, also easily causes instability. But if using fuzzy rule to switch of compound algorithm, it can achieve a smooth transition between different algorithms. So multi model control has attracted much attention. Issam Salhi [7] and M.Kalyan Chakravarthi [8] etc. conduct deep research on multi model PI controller. Baozhu Jia has come up with a fuzzy switched PID (FS-PID), which combines the advantages of fuzzy control and PID control [9]. Fuzzy PID is used to increase the transient response speed, while traditional PID to improve the tracking error of steady state. Ahmed Rubaai applies the fuzzy switch position controller to the traditional bang-bang control [10] which improves the control precision of system, especially in the case of interference, which can still be able to ensure superior control performance.In this paper, the advantages of two control strategies are combined, and a compound control strategy based on inverse system control and PI control is proposed. Based on the fuzzy switching rules, it achieves the smo...