The Study And Application Of Pneumatic Position Servo Control Based On DSP

In recent years, one of the most striking development trends in pneumatic control technology is to realize aero-electronic integration and aero-mechanical integration by means of organically integrating pneumatic technology, electronic technology and mechanical technology. Because of the integration of aerodynamic technology and electronic technology as well as the maturity of the surrounding technologies, the practicability of aerodynamic technology in industrial automation field has been fully reflected. Therefore, pneumatic servo positioning technology has received great attention from the industrial sector and academia as soon as it appears, which opens broad prospects for aerodynamic technology into the industrial automation field.Digital signal processing is a booming discipline theoretically based on multi-disciplines and widely applied in many areas. It is used to analyze and handle digital signals with its focus on theoretical analysis, algorithm determination and software processing such as Fast Fourier Transform (FFT), convolution, digital filtering and so on. To accomplish these algorithms, especially to complete a real-time algorithm, special hardware support is necessary and digital signal processor (DSP) is one of the best hardware supports.This paper concentrates mainly on the studies of pneumatic servo positioning, and designs a DSP-based pneumatic servo controller, which breaks through the traditional two-point aerodynamic positioning, accomplishing a precise multi-point positioning. DSP-based control system has a strong advantage over computer-based and SCM-based control systems. It not only overcomes drawbacks of computer-based control system such as largeness, high cost, complexity in controlling and inconvenience for the industrial working field; it also resolves the problems of SCM-based control system in slow computing, unsuitable for comparatively complex algorithms and impossible to achieve a highly precise control. DPS-based system, characterized by cost-effective, high speed, ability to complete the complex control algorithms and small size, low power consumption, easy to upgrade, is therefore quite compliable to pneumatic servo positioningSince the pneumatic system has the disadvantages such as time-delay, time-dependent, nonlinear and unable to establish precise model, it is a typical nonlinear system. Strictly speaking, no control method can be applied to the whole control process, and conventional control strategy is far from satisfactory. For different control strategies have reciprocal advantages, and therefore they can be combined to make up for the disadvantages of each other. The new hybrid control strategy, with better performance, overcomes the drawbacks of its component strategy, and it has great significance to improve the performance of the controlled objects.This paper proposes a control strategy suitable for the DSP-based control system—Intelligent fuzzy PID, which integrates artificial intelligence, fuzzy control and classic PID control. The hybrid control strategy not only simulates the senior intelligent acts, but also has intuitive reasoning ability of fuzzy control, accomplishing parallel control and knowledge sharing and thus meets the speed and flexibility as well as stability of the system.