Design And Study Of Multi-Channel Hydraulic Servo Control System Based On DSP2812

During the automotive design and research, the static loading test, dynamic loading test and fatigue test of its suspension and rear axle are indispensable processes; moreover, the electro-hydraulic servo control system is also the indispensable loading equipment during those tests. So the study and design of digital electro-hydraulic servo control system using for the experimental console of the automotive structural frame fatigue test are not only favor to improve our country automotive fatigue test level, but also favor to boost our country automotive industry development.This article is based on the computer technology and hydraulic servo control technology, designs a new-style DSP hydraulic servo control system. With advantages of low cost, low power consumption, high-speed and good real-time character etc., TMS320F2812 CMOS chip is selected as the CPU of this system.At first, this article discusses the theory and basic characteristic of hydraulic servo control system, studies the system function requirement and performance index, then the system general design scheme is established. According to this scheme, the 32-channel analog signals processor with the modulation, enlargement, filtering and demodulation functions is designed separately. The controller main-board is designed with DSP2812 as its CPU, and also sets the serial interface and input and output of the switching value on it .The A/D acquisition card and the backward D/A output module are designed with CPLD and FIFO technology, AD976A, DAC7625 and many other CMOS chips.Moreover, based on the general PID algorithm, we have studied the feed forward PID control algorithm, and also get excellent simulation effect by theMATLAB software.We choose graphic programming tool LabVIEW as upper PC's software and use it to design the man-machine interactive interface, and use C language to compile the real-time controller's software program.After all parts' design of the system, we debugged it. From the debugging result we can see that this system have reliable performance, high control precision, convenient operation and also well control effect.