Research And Develop On Embedded Control System Of Crank Slider Mechaism

With the rapid development of science and technology, traditional machinery, apparatus is working toward the development of high-speed, heavy, light, miniaturization and precision of the direction. With high-speed, precision machinery and instruments are proposed higher and higher demands for precision. The machinery and equipment design, manufacture, installation, wear and measurement of the process can produce an error, and the kinematic pair in gap is caused by the main reason of error. And too large clearance not only greatly reduced mechanism kinematic accuracy, but also causes the motor side impact, appeared a large elastic deformation, acceleration component wear, so that the clearance volume becomes larger, producing excessive noise. If artificially reduce the gap, it will not only produce the possibility of jam and affect the life of the machine, reducing the reliability of the machine, but also increases the difficulty of control.In this paper, we mainly consider that the gap between connecting rod and slider block affect the kinematic accuracy of Crank-Slider mechanism, in addition, modeling and simulation for the ideal Crank-Slider mechanism and Crank-Slider mechanism with clearance. The article study on the classic PID control theory and modern fuzzy control theory, which combined modern fuzzy control theory with PID control theory, build appropriate fuzzy PID control architecture for the Crank-Slider mechanism control system, design corresponding control rules and strive to be better than both of control. At the same time, design simulation verification platform based on MATLAB/Simulink, done contrastive experiment for Crank-Slider mechanism when it have fuzzy PID controller and do not have. Experiments show that Fuzzy PID controller is an ideal method of control. It can improve the kinematic accuracy of Crank-Slider mechanism to some extent. Furthermore, research is done on Fuzzy PID controller based on μC/OS-Ⅱ+STM32 platform, the core of which is Fuzzy PID control procedures achieve. And done the work to combine μC/GUI with LCD touch screen, as a result design a good man-machine interactive interface.On the basis of the work have finished, build a displacement control system for Crank-Slider mechanism, which contains the controller, drive, stepping motor, Crank-Slider mechanism, raster displacement sensor, can verify fuzzy PID controller performance, and also, supervise and control the displacement deviation of Crank-Slider mechanism real time.