In this paper, the engine output torque model and fuel\nconsumption model are established on the basis of engine\ntest results. In particular, it focuses on setting up the\noptimization model where the objective function is\ncomposed of driving loss rate and efficiency loss rate with\neach weighting genes, highlighting the introduction of the\ngenes which vary as transmission gears with different needs\nfor the performance of power and fuel economy. The model\nresults in a optimal matching which gives a good\ncompromise to power performance and fuel economy,\ncatering to the very bus actually and general kinds of\nworking conditions. The optimization programs are written,\ndealing with constraint problems based on the penalty\nstrategy in improved GA. The feasibility and validity of this\noptimization approach are assessed on a practical example,\nwhose optimization values of the transmission ratios and the\nfinal drive ratio are obtained and composite performances\nare improved.
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