混合动力汽车, 等效BSFC, 分段控制, 转矩分配

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Based on the proposed system architecture of a plug-in parallel hybrid vehicle, a dynamics mathematical model of the whole vehicle's powertrain/transmission system including engine, motor, battery, clutch, transmission box was put forward which was capable of simulating transit synchronizer progress and clutch engage or disengage progress during gear shift or mode change stage. In accordance with the battery SOC, the electricity max algorithm or powertrain efficiency algorithm was adopted. The energy distribution algorithm of powertrain efficiency based on equivalent BSFC and battery SOC balancing was brought forward which took engine's BSFC and motor's motor/generation efficiency into consideration. The optimal torque distribution can be realized under varying sets of vehicle speed and torque requests at the input shaft. Theoretical analysis and simulation results show that, the proposed energy distribution algorithm can increase powertrain system working efficiency and the whole system fuel economy without sacrificing any vehicle performance. 