Electronically Controlled Automatic Mechanical Transmission (amt), The Shift Schedule

Automated Mechanical Transmission, as so called AMT, is a new-style transmission system. AMT technology applies the automatic technology to the manual mechanical transmission and makes the selection-gear, shift, clutch and throttle implement automatically. AMT technology is suitable for the situation of our country, and has an expansive market and development foreground.Shift schedules decide the time to shift and are the soul of the AMT. When the AMT is working, by comparing the states of the vehicle with the optimal shift schedules, the AMT decides the optimal shift time and achieves the shift automatically. This will lessen the tiredness of the driver and improve the safety. At the same time, the power and fuel-economy of the vehicle can also be improved. The author chooses the shift schedule as the key technology problem to be researched and the main study aim of this thesis is to get the optimal shift schedules for the AMT and so improve the power and fuel-economy of the vehicle.Through analyzing the influence factors of power and fuel-economy for the automobile, the author get the establishment methods for the optimal-power shift schedule and optimal fuel-economy shift schedule. In order to solve the influence of mass on the shift schedule, the author presents a variable-structure-controlled shift system. This enriches the theory of shift schedules. Because the computer simulation can save a lot of manpower and material resources comparing with the true-car test, so in this thesis, the author uses the simulation toolbox Matlab/Simulink to set up the simulation model for shift schedules. Using this model, the optimal-power shift schedule and optimal fuel-economy shift schedule above are simulated and proved to be reasonable.