| Combined with the project of National Foundation for Natural Sciences "Research on Automatic Transmission Technology for Construction Machinery" (serial number:50075033),this paper focused on the research for theory and engineering application of Automatic Transmission Technology of construction vehicle.Based on the previous research findings, with ZL50 Wheel Loader as research subject, the author deals with the overall process of construction vehicle automatic gear shifting system developing from the angle of system development,which mainly includes the establishment of gear shifting control strategy and the hardware system and software system designing and development of the gear shifting controller,in addition,we validated the actual control effect of the control system by means of computer simulation and bench test, in regard to the problem being in the test,We made profound analysis and disposal,which cause the control system operate more effectively.The whole paper consists of six chapter.We will set forth main content and scientific effort of every chapter.Chapter One ExordiumIn chapter one, the development of vehicle automatic transmission oversea and inland is introduced firstly according to the natural timetable and importance of the technology in construction machinery is emphasized. In addition,the chapter point out the limitation of lower transmission efficiency of construction machinery hydrodynamic machien transmission system , and come up with a practical and effective method to settle the problem,furthermore,We discourse upon the profound significance in the research of construction machinery automatic gear shifting technology,the basic conception and design principle of construction machinery automatic transmission system..At last,the chapter explicitly bring forward the main research content of the paper. Chapter Two Transmission system modeling and dynamical analysisThe main research effort consist of several subjects.Above all,We establish mathematical model of ZL50 Weel Loader dynamical system and transmission system,which is the theoretical basis of the following computer simulation.In addition,the chaper set forth the problem being in dynamic performance of the construction machinery hydrodynamic machien transmission system and resolvent, further demonstrate the feasibility of the project.Chapter Three The research of intellectualized transmission shift strategyIntellectualized transmission shift strategy is the theoretical basis in the development of Automatic gear shifting system,which is also the kernel content of the paper.After focusing on prevalent transmission shift strategy,in view of the work characteristics of construction machinery,the author comes up with a transmission shift control strategy which is based on the ideology of dynamic system and transmission system joint control.the control strategy consists of optimal shift decision-making module and gear shifting process control module.the task of optimal shift decision-making module is judge.the optimal shift of a certain time according to the status parameter of the vehicle in the time of day.The job of the gear shifting process control module is real-time regulate the accelerograph controller by the conclusion result of the optimal shift decision-making module,which insure the vehicle keep in optimal running state.the control strategy embody the ideology which is the unite of traditional control methods and intelligent control methods.Chapter Four The development of automatic gear shifting control systemThe automatic gear shifting control system is the flat roof of materializing the transmission shifting strategy.The chapter mainly treat with the whole process of the design of hardware system and the development of software system of the Weel Loader automatic transmission shift controller.In the process of designing,We adopt the blocking design ideology,In regard to every functional module,from the design of hardware circuit to the program realization of correlative arithmetic,We develop inde... |
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