| The thesis uses optimization design theory, makes optimization design on transmission parameters of automobile, and exploits the software of transmission parameters optimization design. Firstly, the thesis begins on the tractive performance and fuel economy of automobile, introduce the mathematic model of engines and transmission etc. and puts forward the solving methods under unstable condition, summarizes the calculating methods of tractive performance and fuel economy. Bases on this, uses optimization design theory, looks the fuel economy of automobile as aim function, looks tractive performance as instructed qualification, puts forward the optimization design method of automobile transmission parameters, and solves it with complex algorithm. Bases on above theory, uses Matlab as a tool to programme the software of transmission parameters optimization, and also take Matlab/GUI as the interface-exploiting tool to set up a interface of mutual communication between men and computers. Using Matlab as the platform, it has a very friendly interface, strong function of mutual communication between men and computers, and easy operational methods. Except the transmission parameters optimization function, the software also can calculate tractive performance and fuel economy. The tractive performance calculation mainly includes the maximum speed, the maximum climbing degree, acceleration capability and dynamic index. The calculation of fuel economy includes the calculation of uniform velocity, accelerating process, decelerating process and fuel consumption under multi-working conditions. Lastly, takes the Lubao car of Hafei automobile Ltd. as example, simulates the functional index of it and get a satisfying result after the test on practicability and reliability of this software.
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