Optimization calculation for parameters of heavy vehicle transmission system based on PARETO optimality solution

摘要

Heavy Vehicle (HV) transmission system parameter matching is very crucial for improving the performance of vehicle. In this paper, PARETO optimal theory is used for the multi-objective optimization design of the HV transmission system, a multi-objective optimization model is established with considering the two conflicting objective functions, which is namely, dynamic performance (DP) and fuel economy (FE) of the HV, and the transmission ratio of the system as design variable. With a case study of certain HV, the approximate model (AM) of the HV's CRUISE model is first built as a surrogate in the process of multi-objective optimization (MOO) in order to improve the accuracy and speed of the optimization calculation. Then, the MATLAB genetic algorithm (GA) toolbox is applied to solve this optimization problem, and some PARETO optimal sets are obtained. From the results, it could be seen that a well-distributed POS of the AM could be obtained from the proposed optimal approach. Furthermore, the PARETO set can provide more choices for engineering staff as they are given more design schemes, from which to select the most suitable transmission parameters according to the requirements of the vehicle's DP and FE.