Analysis and energy management strategy of the dual-mode power-split hybrid driving system

The power-split hybrid driving system can enhance the dynamic and fuel economy performances markedly by the corresponding of the power-coupling machine and the motors. The dual-mode hybrid system can augment the speed range by the mode shifting and it is suitable for the heavy and off-road vehicles. Based on the power flow and the restricting relation of the speed and torque, the energy management strategy for the dual-mode power-split hybrid driving system based on the optimal fuel economy of the engine is proposed. This strategy adjusts the engine operating state which can enhance the fuel economy by adjusting the speed and torque of the motors. And the power and the operating points of the engine, the batteries and the motors is ascertained by the strategy. The hardware-in-the-loop (HIL) simulation platform for the hybrid driving system based on the dSPACE is developed and the HIL simulation of the energy management strategy is carried on. The test results indicate that the energy management and control is realized by this strategy and the fuel economy is enhanced by optimizing the engine operating points.