Study Of Optimal Match Of Heavy Commercial Vehicle Transmission Parameters

In this paper, we studied optimal design and matching process of heavy commercial vehicle transmission parameters. Firstly, we compare with some mathematic method about modeling engine characteristics; the conclusion is Least squares method has the best fitting precision. In view to the problem of gathering data from the engine fuel consumption characteristics picture, we give an engine fuel consumption characteristics digitalized method. The method can establish the engine math model quickly and accurately. The following simulation dynamic and economic of heavy commercial vehicle has a good basis.Then we analyze the process of computer simulation of the automobile power performance and fuel economy; establish the evaluation index of the optimal match of heavy commercial vehicle transmission parameters, which based on practice conditions. Give a math model of matching process of heavy commercial vehicle transmission parameters. After that, the transmission parameters of a heavy truck are optimized with the index, in the optimization model, final drive ratio is continuous variable and tire size is discrete variable. And the constant speed oil-consumption per 100km of the truck is improved.Finally, based on the analysis of Multi-joint kinetic, we study the Optimal Design of Multi-joint Propeller Shaft Arrangement for Automobile, the result is satisfied.