Automatic Transmission, Vehicle Dynamic Characteristic Simulation

During the development of transmission technology, automobile's automatic gear-shift is becoming a very important studying aspect. Along with the domestic car age's coming, and the curbstone drivers' increasing, safe comfortable and easy driving cars are increasingly required. So a humanistic design of cars has become an important studying task. Automatic transmission has become more and more useful in automobile and especially in cars, and already been a key part of cars and multi-purpose vehicles,forAT has so many excellences as follows: convenient operation and smooth accelerate.Moreover,it can automaticallys hift gea rin term of optimal occasion.Automatic gear shifting is the target which people are seeking over a long period of time .It is the significant sign of automobile evolving to the advanced stage and the important technology which desiderate developing and spreading. The automobile with automatic transmission (AT) has smooth gearshifting and comvenient operation. Moreover, it can automatically gearshift in term of optimal occasion,redounding to the improvement of dynamic performance and fueleconlmy.This paper sets up the engine's numerical value model, which is based on analyzing AT's structure and working principle. The original character curve of the conquer converter is used to analyses the matching question between engine and itself. According to dynamic equation the simulating model of automatic shift gear system has been set gear-shift schedule's designing is researched because it is the core of automatic gear shifting.The kernel of automatic gear shifting is gear-shift schedule and gear shfting is excutived according to control parameters. Heretofore, gear-shift schedules of most AT veicles in the world are based upon static two-parameters.The dynamic schedule are designed according to the acceleration characteristic. At the same time,the locking-up schedule of torque converter is determined. According to the dynamical equation of vehicle riding, the system for simulating the dynamic driving mode of AT vehicle is established. With the system, the dynamic characteristic with AT are simulated.The results show that the system can simulate the actual driving status well, the dynamic performance of this car basically meet the technical requirements.