关键词: 控制策略, 燃油经济性, 系数优化, 中度混合动力

Abstract: Based on the vehicle dynamics theory, the system efficiency of medium hybrid electric vehicle with ISG (Integrated starter/Generator) is instantaneously optimized, and then, the control strategy of medium hybrid electric vehicle(Medium-HEV) is obtained. The three important coefficients and their spans in this control strategy are defined, including battery shifting factor , the charging curve factor of engine Xe_chg and the shutting off curve factor of engine Xe_off . By setting up simulation models of medium-HEV to calculate the equivalent fuel consumption of battery ∆SC based on Matlab/Simulink, the three important coefficients are optimized with the aim of minimizing the integrated fuel consumption of hybrid system, thereby the matching and optimal control strategy of hybrid system are determined. Simulation results indicate that the fuel consumption of medium HEV is reduced by 36.95% comparing with conventional vehicle, thus greatly improving the fuel economy.

Key words: Coefficient optimization, Control strategy, Fuel economy, Medium hybrid electric vehicle