Abstract:

Aiming at the need of the vehicle equipped with the continuously variable transmission for both power performance and fuel economy under non-steady working conditions and the fact that the present control strategy is lack of accurate target of transmission ratio control, taking the best match of power performance and fuel economy as control target, an optimal matching datasheet control strategy was proposed. Based on the experimental data, a driveline model was built with MATLAB/Simulink. The relationships between the fuel economy and the target transmission ratio under non-steady working condition were determined by simulations, the best matching datasheet was obtained by matching with the power performance, and the optimal control target on transmission ratio was achieved. Simulations under typical non-steady working conditions show that the optimal matching datasheet control give out accurate optimal transmission ratios.

Key words: vehicle engineering, continuously variable transmission(CVT), non-steady working conditions, transmission ratio, control strategy