车辆自动变速系统性能仿真研究

应用系统辨识与理论建模相结合方法，建立了车辆传动系及其部件的动力学模型，并在Ｍａｔｌａｂ／Ｓｉｍｕｌｉｎｋ环境支持下，建立了车辆传计系统。该系统可以模拟不同换挡控制规律下的车辆性能，并针对各种换挡控制算法模拟车辆换挡的动态过程，为换挡规律的开发、换挡动态过程的控制和电控液力自动变速器的研究提供了方便。

A Powertrain Modeling and Simulation of Automatic Transmission Control System

The paper developed a dynamic simulation system of vehicle powertrain using a tool of Matlab/Simulink by means of combination of principles, component and/or subsystem test results and past experience. It can be used to predict vehicle performance, fuel economy and emission under different shift strategies and the transient characteristic of vehicle during gearshift. The simulation system consists of five parts: a driver model, a road load model, a vehicular model, a transmission system model and a shift controller model. With the help of the simulation system, a designer can test his design quickly and safely. The powerful usage enable it to predict the effect of changes in control strategies on dynamic performance of the vehicle system quickly and safely. As a powerful tool it can shorten developing cycle and reduce developing cost in development of an automatic, electronically controlled transmission. The structure of the fuzzy controller model and the fuzzy shift schedules are given in the paper. The simulation results include the acceleration process of the vehicle from standstill with constant throttle, and the influences of different shift schedules on the dynamic system of a vehicle.