The Study On The Shift Quality Of Automatic Transmission

As the development of automobile technology, the convenience and comfort are highly desired by people, so more and more automatic transmissions are installed to cars. Automatic transmission is the main part of the vehicle driving system, so it has much influence on the performance of the vehicle. Automatic transmission shift up and down through the joint and withdrawing of the unite components, so the shift process is actually the process jointing and withdrawing of the unite components.Because of the different speed ratios, the state of the driving system has a sudden change, but the joint components can't act in time; And at sometime the friction moment of the components change; All These will cause a impact of the vehicle and the increase of the components temperature.In this paper the influence of Automatic transmission's shift process to vehicle driving smoothness, drive system load and the life of the unite components is analyzed. The evaluation method and index of shift quality are introduced from subjective and objective points. Also the methods to improve the shift quality are brought forward based on the influencing factors.