Five-parameter Shift Strategy of Automatic Mechanical Transmission for Electric Bus

According to optimized shift strategy, the electric vehicle equipped with automatic mechanical transmission (AMT) can make the driving motor running in high efficient working area, which can improve dynamic and economic performance for the vehicle in different driving conditions. Drivers, vehicles and roads are indivisible unity. How to identify driving intentions and road environment is the basis for intelligent automatic shifting system to achieve adaptive gear decision and shift control strategy. This paper proposed an algorithm using recursive least squares method to identify vehicle quality and road slope, and calculated a five-parameter shift strategy based on vehicle speed, throttle opening, mass, slope and acceleration which can make the vehicle have ideal economic performance while taking the power demand into consideration.