Optimization of gearshift MAP based on DP for vehicles with automated transmission

Dear editor, The gearshift system is the key part of an automatic transmission vehicle that optimizes power and economy. An accurate and reasonable shift schedule has a significant theoretical and practical meaning for improving both dynamic and economic performances because it defines the control parameters used for the gearshift decision making and shift timing [1–3]. One gearshift strategy is to establish an optimal control problem to improve the overall performance. In the face of complex road conditions and individual driving requirements, many researchers adopt the method of building an intention recognition model to correct the shift schedule in real time [4,5]. However, the optimal problem cannot be approximated as a continuous one because the gear ratio is discrete, thereby making it a nonlinear problem, which is challenging to solve. Thus, the nonlinear optimization is often time consuming and not suitable for online implementation to a certain extent [6, 7].