The Study On Shift Quality Of Integrated Transmission System

The integrated transmission device is an important part in high speed tracked vehicle, its performance has a very tremendous influence on the performance of the entire vehicle and the transmission system life. This thesis analyzed the factors that influence the shift quality, and carried on the thorough analysis and research on the shift quality control technology. The main research contents are as follows:1,This thesis summarized the characteristic, development course, domestic and foreign present research states and development trend of the integrated transmission device, and introduced the primary coverage and the development method of automatic transmission.2,Object-oriented modeling method was used in modeling of the integrated transmission device. The SimDriveline toolbox was used in dynamics modeling and simulation. The major components, including the friction clutch, the fixed axle type and the planet type gear box, the hydraulic controller and actuator, have established. The models have a very good versatility, all process can be finished under the identical simulation platform. And the dynamic process simulation, such as the vehicles movement, shifting gears and so on, were also carried on in this thesis.3,This thesis multi-analyzed the reasons which produce the jerks in the shift process and discussed several methods improving the shift quality. The launch prompt oil control, the hydraulic buffering valve pressure control and the implementing agency movement overlap-time control were also discussed. After well analyzed, a shift quality control method was given.4,In referring of massive literature, the existed shift quality assessment methods and targets, we established the shift quality subjective and objective targets for the integrated transmission device. The Genetic Algorithm (GA) was used in the shift quality optimization process.5,DCS was applied in the comprehensive transmission test platform, some procedures were programmed in this environment. The simulation and bench test results indicated the rationality and validity of the models, the controlling means and the proposed shift quality controlling methods.