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With the rapid increase in car ownership in China, automobile oil has accounted for more than 40% of China's total oil consumption, while a variety of harmful pollutants in vehicle emissions accounted for more than 50% of China's air pollution emissions. Therefore, reducing the amount of vehicle fuel and emissions of harmful substances, as China's energy conservation problems to be solved. Ensure that power under the premise of a reasonable match, the car's transmission system optimization, can effectively improve vehicle fuel economy and reduce emissions, has important practical significance. Vehicle power, fuel economy and emissions simulation method, on this basis, the automotive powertrain selection matching method, the train parameters optimization design methods, and the development of corresponding software systems, mainly to complete the work as follows: (1) 1-2 mapping method, the external characteristics of the engine and fuel Wan characteristics of data processing, engine performance computing model, and on this basis to study the analysis and calculation method of the performance of the car, which area method method of combining the speed integral time, the car acceleration distance analysis and calculation, to avoid implicitly problem solving. MATLAB software platform designed vehicle performance simulation program. (2) selection of automotive driveline matching methods and train parameters optimization method and the use of The MATLAB software design selection matching, to optimize the design of mathematical models and model solver. Match the selection of the drive train, this paper reference weight set and correction vector method of combining analytic hierarchy process evaluation system established a matching program; segment optimization strategy for the optimal design of the power train parameters, based on each gear investigated the performance of the car, the different gear transmission than the optimal search strategy can effectively improve the convergence rate of the optimization calculation, and contribute to better local optimal solution. (3) MATLAB and Visual C platform, the development of vehicle dynamic parameter simulation and optimization software - VDPSO (Vehicle Dynamic Parameters Simulation and Optimization) performance analog, component selection match, train parameters to optimize the design and other functions. (4) a 12m buses, light trucks, two actual vehicle powertrain parameters were optimized design; selection match on a medium-duty truck drive system, the validation of software systems, and optimized power train parameters, selection matching results available to the user reference.
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