Research On Wireless Electro-hydraulic Controller And Its Application

Tightly combined with the development of technologies of microelectronics, auto-control and radio engineering, the technology of wireless electro-hydraulic came into being. Compare to wire electro-hydraulic technology, the wireless electro-hydraulic have many advantages. With this technology, the work environment of modern engineering equipment is greatly improved, also does the automaticity of modern engineering equipment. Technology of wireless electro-hydraulic is one of the important development tendencies of the electro-hydraulic technology. Around the topic of wireless electro-hydraulic technology, the main contents of this thesis with the relevant conclusions are as follows:In chapter 1, firstly the development of electro-hydraulic control technology is discussed, then the status and development tendency of wireless electro-hydraulic control technology at domestic and abroad is analyzed, and come to a conclusion that using VLSI, technology of wireless digital communication and technology of error-correction is the developing tendency of wireless electro-hydraulic technology, also the significance and the contents of the thesis are put forward.In chapter 2, firstly the basic methods of wireless electro-hydraulic controller is analyzed, and it is divided into three functional modules. Then the hardware design and implementation of the functional modules are discussed in detail. Lastly the hardware methods of anti-disturbance are given, and entirely finished the hardware design of wireless electro-hydraulic controller based on VLSI and technology of digital communications.In chapter 3, the software design of wireless electro-hydraulic controller is provided; the program is coded with the C51 language that have many advantages such as modularization, structurization, easily implementation the control algorithm and good compatibility. According to actual system requirements and experiments, the communication protocol is provided, using OxFF and 0x00 as the data head is a good solution to nRF40rs random output signal, and also using the muti-machine communication theory is a good solution to communication between the controllers. Then the flowcharts of functional modules are given. Lastly the software methods of anti-disturbance are described, and entirely finished the software design of the wireless electro-hydraulic controller.In chapter 4, according to the relative theory of the antenna and the circuit theory,the model of the low cost microstrip antenna which is easily manufactured on PCB is deduced, and the impedance matching of the antenna is put forward; also the formulas of the microstrip antenna's communication range are given. With the actual parameter of microstrip antenna, the remote control range of wireless electro-hydraulic controller is calculated, and with experiments, the actual remote control range of wireless electro-hydraulic controller is given.In chapter 5, firstly the theory of the BSC and GBSC channel model are presented. Then with experiments, the BSC and GBSC model of the controller are established, and come to a conclusion that GBSC model is more suitable to describe the controller's channel model. The established GBSC model gives a design principle of error-correcting system in the next chapter.In chapter 6, firstly according to the simulation and analysis results of the GBSC model established in chapter 4, the interleaved BCH code is selected. Experiments proved that interleaved BCH code has very high performance of error-correction, but the data size of the communication increase a little, and the anti-disturbance performance of the controller is greatly improved.In chapter 7, firstly the operating principle of electro-hydraulic proportional reducing valve with special structure and characteristics is discussed in detail. Then the model of valve is established; also its stability is analyzed. Lastly, an experiment is made on the electro-hydraulic proportional reducing valve. The theoretical analysis and the result of experiments proved that electro-hydraulic pr...