Study On Shift Schedule And Simulation Of Auto-controlling Transmission

The Transmission is regarded as one of the important parts of the automobile transmission system, the development of its science and technology is an evidence of automobile' s technology.The shift schedule is key technology of the automatic transmission. The research of shift schedule is important towards raising the motive, the fuel economy and efficiencies of the vehicle and improving shift quality; it achieves the fast and calm shift. At the same time, the research of shift regulation is significant towards transmission application and population.The development process and the characteristics of automatic transmission are introduced in this paper. And in the domestic and international the status research and the direction process of automatic transmission are also introduced in this paper. And induce the modern automobile up the in common use and automatic gearbox type and applications. Elaborated the vehicle automatically key techniqueThis article has elaborated the input characteristic and the output characteristic when engine and torque converter work together, which is based on analyzing AT's structure and principle. Furthermore, the article has discussed the match question between the engine and torque converter, obtained torque converter's static and dynamic mathematical model by analyzing working characteristic of torque converter's various parts, then made use of the automatic number , the input characteristic and output the characteristic curve are protrated.The kernel of automatic gear shifting is gear-shift schedule and gear shfting is executived according to the control parameters. The dynamic schedule and economic schedule are designed according to the acceleration characteristic and fuel consumption. With provision for operating requirement, the general schedule is designed, too. Finally, according to the automobile travel dynamic equation, this article has established MATLAB/Simulink simulation model of automatic transmission system, established simulation model of the shift logic of optimal shift schedule with MATLAB/Stateflow, and carried on the simulation analysis, confirmed the design plan's validity. The simulation result indicates that the simulation model and gear-shift schedule designed in the article is reasonable.