关键词: AMT 商用车；动力性能；扭矩储备；最佳挡位；油耗率

Abstract: The key technology of automatic mechanical transmission (AMT) development for commercial vehicles is to obtain the optimal gear through reasonable gear decision. In this paper, a method to decide the optimum gear and optimize fuel consumption of AMT commercial vehicle based on dynamic performance is studied. This method gives full play to the power demand of the engine at the current speed, takes into account the torque reserve and acceleration performance required by the vehicle driving dynamic performance, analyzes the reasonable gear by using weighted comparison and dynamic recursion methods, and achieves the optimal engine universal characteristics, reduces the fuel consumption rate and improves the economic performance.

Key words: AMT commercial vehicle; Dynamic performance; Torque reserve; Optimum gear; Fuel consumption rate