Research On Adaptive Power Control System Of A Cold Milling Machine

According to the requirement of Natural Science Foundation of Shaanxi Province'Research on the Model of the Adaptive Power Control about the Continuous Going and Working Machine'(2007E221) and many cold milling machines are operated by the driver through their experience which leads to the low using ratio of the engine power, the low productivity and a high consumption of the oil, the problem of'Research on Adaptive Power Control System of a Cold Milling Machine'is put forward. The adaptive power control system in this research is composed by three subsystem, the first one is the engine rate power control subsystem. When the engine accelerograph is at its maximum position and the load of the machine exceeds the fixed value, this subsystem will control the machine to make the machine work at its rated power or at its maximum productivity. The second is the slip power control subsystem. The resistance of the drive system is very big when the machine worked at the high load, in this work condition ,the slip ratio will increase greatly if the work speed is increased to improve the productivity. This operation maybe make the machine work at its rated power, but it can also lead to the increase of the consumption of the slip power and the serious abrasion of the tyre while the work speed is hardly increased. So it is necessary to make the machine work at its optimum curve and make the machine productivity increase in a lower consumption of slip power. The third one is changing power control subsystem. When the machine work in little load and the work speed is the maximum, the engine power is also not in full use. In this work condition, that the accelerograph is at its maximum position will leads to higher oil consumption. Then the changing power control system is to match the power that the machine consumed to the engine output power and decrease the oil consumption. So the research on adaptive power control system of a cold milling machine is to realize the power control by the way of adaptive control theory and method to make full use of the engine power, increase the machine work productivity and work efficiency, increase the work life and dependability and decrease the oil consumption. The adaptive power control system of a cold milling machine is the research object, the mathematic model of the system is built up, the design of the hardware and software of the system is finished, the simulation of the model and experiment of the control system are also accomplished. From the research work , the conclusions is as follows:(1)After many literatures are consulted, the method and the developing process of the mechanical and electrical integration of the cold milling machine is summarized, the developing process of the machine adaptive power control is analyzed, some control methods and products of the cold milling machine are introduced, the utilization and research actuality of the power control of the minitype cold milling machine are analyzed. According to the analysis, the viewpoint that the engine output power is not only the control aim, but the slip ratio of the drive system and accelerograph are also the control aims is put forward.(2)The theory and elements of the adaptive power control of a cold milling machine are analyzed across-the-aboard. The influence on work equipment and drive system power consumption is analyzed in detail. According to the analysis the work speed is selected as the main control parameter. The influence on the power use of the existing cold milling machine is also analyzed. Based on the analysis of traditional matching of the performance parameters, the influence of the adaptive power control on the matching of the performance parameters of a cold milling machine is analyzed through theoretical verification.(3)The research of the adaptive power control of a cold milling machine can not leave its mathematic model. The mathematic model of the cold milling machine is built up by the way of consequence and experiments. The model is composed by four sub models which are the model of engine, the model of drive system, the model of work equipment and the model of the gun executor. The simulation of the mathematic model shows that the static and dynamic performance of the cold milling machine is represented well.(4)Every function module of the adaptive power control system is researched by the numbers. According to the work characteristic of the cold milling machine, the work principle of Every function module is expatiated in detail. The power control, the gun position and the slip ratio control are talked especially. Based on these analyses, the electro circuit of every function module are all designed, and how to choose the electronic component is also talked in detail. The experiment in the lab shows that the design can meet the control target. (5) According to the mathematic model, the traditional PID control arithmetic and its control effect is expatiate, the model reference fuzzy adaptive PID and the model reference single nerve cell PID adaptive control are introduced mainly. After the excellence and shortcomings of these three arithmetic is compared through simulation by the software of Matlab/Simulink, the model reference single nerve cell PID adaptive control is selected as the arithmetic of this adaptive power control system. Based on the research of arithmetic, the control strategy of the main control module is studied, and the flow chart of the software is designed. The combined control strategy of the engine gun control, the slip ratio control and the power control is put forward.(6)Based on the structure and parameters matching of a cold milling machine, a kind of adaptive controller which can be used on the cold milling machine is developed. (7)The adaptive power control system is used on a cold milling machine which works on the asphalt pavement road. The experimental result shows that the adaptive power controller can meet the requirement of the cold milling machine and has great effect on the machine productivity, the experiment is coherent to the theory. The machine is either in over load or light load without the adaptive power controller, which is hard to make full use of the engine power. The machine works at its rate power by the adjustment of the adaptive power controller. When the machine is equipped the adaptive power controller and the milling depth is 4cm, 8cm and 12cm, the machine work efficiency is improved more 4.1%, 13.3% and 43.9% than a machine without the controller. The adaptive power control system can be used to improve the machine productivity, and these experiment conclusions verify the simulation result that the higher the load is the control effective is more obvious.