Simulation And Exaperiment Research On Fuzzy Control Of Variable Speed Throttle Combined Speed Governing System

The variable speed throttle combined speed governing is a new technology developed on the basis of pump-control-motor hydraulic power transmission. This new power source, which uses variable frequency electromotor to drive hydraulic pump, meets people's energy-saving requirement. Combined variable speed with throttle, it not only has good energy efficiency and good speed regulating performance, avoiding the defects such as slow dynamic response, poor low-speed characteristic, poor speed stiffness, great changes of the efficiency, etc, therefore been studied extensively. It is necessary to explore effective control strategies and algorithms for its complex structure. First of all, the operation mechanism and control strategy of the hydraulic system were researched. Moreover, a set of variable speed throttle combined speed governing control system was designed by the fuzzy PID control algorithm. Built the measurement and control platform of the test bench, the simulation and experimental research of the control system have been completed.The basic form and characteristics of hydraulic speed governing circuit, the overviews and trends of variable speed hydraulic technology, electro-hydraulic and fuzzy control technology are described here. Then some control strategy and fuzzy PID control algorithm on variable speed throttle combined speed governing for the hydraulic experimental system are analyzed and summarized. Built simulation system in AMESim, the control section of speed governing system is studied by AMESim-Simulink Co-simulation, designing the controller involving composite control strategy and fuzzy PID control algorithm. And then the development of the hydraulic control system is completed based on virtual instrument technology and modular design method. In data acquisition module, DAQmx measurement framework and data sampling and reduction are discussed, which uses a single pulse width measurement method to get motor speed and obtains the desired results though a series of data process. In control module, the LabVIEW programs of digital PID controller and fuzzy controller are mainly achieved. In addition, the control platform reaches a higher level of information for the video surveillance module and the network communication module. By means of the established co-simulation system and control platform of experimental system,a lot of simulations and experiments have been carried. The results demonstrate the superiority of pump variable speed throttle combined speed governing system on energy conservation and control compared with conventional hydraulic speed governing system. What's more,the new composite control strategy and fuzzy control algorithm further improve its control characteristics. Figure [67] table [9] reference [64]...